Entries |
Document | Title | Date |
20090043509 | Compensated Caliper Using Combined Acoustic and Density Measurements - A logging-while-drilling density sensor includes a gamma ray source and at least two NaI detectors spaced apart from the source for determining measurements indicative of the formation density. An analytic function based on a heuristic model is used to predict the measured response as a function of offset, mud density and formation density. The model may be used to provide a caliper measurement where acoustic caliper data are unreliable. It is emphasized that this abstract is provided to comply with the rules requiring an abstract which will allow a searcher or other reader to quickly ascertain the subject matter of the technical disclosure. It is submitted with the understand that it will not be used to interpret or limit the scope or meaning of the claims. 37 CFR 1.72(b). | 02-12-2009 |
20090082970 | Electromagnetic Surveying - A method of analysing results from an electromagnetic survey of an area that is thought or known to contain a subterranean resistive or conductive body within a background strata configuration is described. The method comprises providing a set of electromagnetic field data obtained using at least one electromagnetic receiver and at least one electromagnetic source for a range of source-receiver separations, e.g. providing conventional controlled-source electromagnetic survey data. A subset of the electromagnetic field data is identified that comprises data obtained for source-receiver separations greater than a selected threshold offset. The threshold offset is chosen so that data beyond this offset are characteristic of magnetotelluric data. Thus the subset of data is then processed in accordance with a first technique to obtain information on the background strata configuration. Other electromagnetic field data obtained for source-receiver separations less than the threshold offset may then be processed in accordance with a second technique to obtain information on any subterranean resistive or conductive body within the background strata configuration. | 03-26-2009 |
20090150077 | Pulsed X-Ray Signal Processing - Method and system for analyzing electrical pulses contained in a pulse train signal representative of the interaction of x-ray bursts with a nuclear detector configured for subsurface disposal. The pulse train signal is sampled to form a digitized signal. The total energy deposited at the detector during an x-ray burst is determined from the digitized signal, and a count rate of x-ray pulses from the burst is determined. A subsurface parameter is determined using the total energy deposit. | 06-11-2009 |
20090157317 | RADIAL DENSITY INFORMATION FROM A BETATRON DENSITY SONDE - An apparatus and a method for determining characteristics of earth formations traversed by a borehole that compensates the mudcake and standoff effects with fewer than usual detectors. The apparatus includes an radiation source effective to generate first and, spatially as well as temporally separate, second X-rays for irradiating earth formations from first and second entrance angles, one or more X-ray detectors capable of generating a first and a second signal indicative of the intensity of the first and second X-rays returned from earth formations to the detectors and a housing accommodating the radiation source and the detectors. | 06-18-2009 |
20090210161 | Methods of Identifying High Neutron Capture Cross Section Doped Proppant in Induced Subterranean Formation Fractures - Methods are provided for determining the locations and heights of fractures in a subterranean formation using a neutron-emitting logging tool. Utilizing predetermined relationships (1) between logging tool count rates and associated apparent formation hydrogen index values and (2) between logging tool count rate ratios and associated apparent formation hydrogen index values, the methods detect the presence and heights in the formation of proppant containing high thermal neutron capture cross section material in a manner substantially eliminating proppant determination uncertainty resulting from a prior change in formation hydrogen index values. A second, associated, method employing logging tool count rates and count rate ratios to determine the presence of proppant containing high thermal neutron capture cross section absorbers utilizes a crossplot of count rate versus ratio. Logged intervals containing no proppant will fall on a trend/trendline on the crossplot, whereas logged intervals containing proppant will fall off from this trend/trendline. | 08-20-2009 |
20090248309 | EVALUATING A RESERVOIR FORMATION - In general, in one aspect, the invention relates to a method for evaluating a volcanic reservoir formation having volcanic rock forming elements and a borehole penetrating the volcanic reservoir formation. The method includes controlling chlorine concentration in an environment of the borehole and a tool operation to enable neutron capture spectroscopy measurements of the volcanic rock forming elements, obtaining neutron capture spectroscopy data relating to the volcanic rock forming elements from borehole logging tools, determining a lithology of the volcanic reservoir formation based on at least the neutron capture spectroscopy data, and generating an evaluation of the volcanic reservoir formation based on at least the lithology. | 10-01-2009 |
20090276157 | SYSTEM AND METHOD FOR INTERPRETATION OF WELL DATA - Well log data is assigned depositional labels by a soft computing method. A model is trained on an expert-interpreted well log by segmenting, assigning fuzzy symbols to the segments, and calculating attribute values for units labeled by the expert. From these values, classifiers are trained for each of a number of depositional types. Finally, a model is developed for translating fuzzy symbols into depositional labels. Once trained, the model is applied to well log data. | 11-05-2009 |
20090276158 | Azimuthal Elemental Imaging - Measurements made by a wireline-conveyed pulsed neutron tool with two or more gamma ray detectors are used to provide a mineralogical and/or elemental image of the formation. This may be used in reservoir navigation and in furthering the understanding of the geology of the prospect. | 11-05-2009 |
20090292472 | Method for the Characterization of Geological Formations - A method for determining the water saturation of an underground formation traversed by a borehole, the method composing:
| 11-26-2009 |
20090292473 | Real-Time NMR Distribution While Drilling - NMR spin echo signals are acquired downhole. Principal Component Analysis is used to represent the signals by a weighted combination of the principal components and these weights are telemetered to the surface. At the surface, the NMR spin echo signals are recovered and inverted to give formation properties. Real-time displays may be used for determining formation properties and for altering the acquisition parameters | 11-26-2009 |
20090306897 | METHODS AND APPARATUS TO DETECT CONTAMINANTS ON A FLUID SENSOR - Methods and apparatus for detecting a coating on a downhole fluid sensor are disclosed. A coating may refer to a solid or liquid film on a sensor interface with the sampled fluid, caused by contaminants. Detecting a coating may be accomplished by determining a sampled fluid type and measuring at least one fluid parameter using one or more downhole fluid sensors. The coating detection further includes determining whether the measured parameters are within ranges corresponding to the determined fluid type. Additionally or alternatively, measured parameter values that remain substantially stable during sampled fluid pumping may also indicate a coated sensor. | 12-10-2009 |
20090326825 | METHOD FOR DETERMINING FORMATION WATER RESISTIVITY FROM A WIRELINE PULSED NEUTRON DEVICE - A method for estimating resistivity of a formation includes: selecting spectra collected by pulsed neutron instrument disposed down a wellbore traversing the formation, the spectra including capture interactions and inelastic interactions; deconvolving the spectra to estimate an elemental yield; converting the elemental yield to a total concentration value; subtracting a concentration value for drilling mud and a concentration value for the formation from the total concentration value to estimate a concentration in fluid within the formation; and converting the fluid concentration value to a resistivity value. A computer program product and an instrument are provided. | 12-31-2009 |
20090326826 | METHOD AND APPARATUS FOR FLUID MIGRATION PROFILING - A method for obtaining a fluid migration profile for a wellbore, comprising the steps of obtaining a static profile for a logged region of the wellbore, obtaining a dynamic profile for the logged region of the wellbore, digitally filtering the dynamic profile to remove frequency elements represented in the static profile, to provide a fluid migration profile, and storing the fluid migration profile on a computer-readable memory. | 12-31-2009 |
20100004867 | FORWARD MODELS FOR GAMMA RAY MEASUREMENT ANALYSIS OF SUBTERRANEAN FORMATIONS - Methods and related systems are described for predicting a response of a gamma ray measurement tool located in a borehole surrounded by a subterranean formation. A response of the tool is calculated according to one or more properties at a plurality of spatial locations in relation to the measurement tool using a forward model that assumes a non-linear relationship between the one or more properties at the plurality of spatial locations and the corresponding response of the tool. | 01-07-2010 |
20100017134 | GRAVEL PACK ASSESSMENT TOOL AND METHODS OF USE - A gravel pack evaluation tool comprised of a low energy radiation source and multiple directionally-collimated radiation detectors to analyze small, azimuthal segments of a gravel pack. Methods of use are also provided. Collimators and radiation shielding used in conjunction with multiple detector arrays allow an azimuthal segmented view of a gravel pack, particularly at certain defined depths into a gravel pack. Radioactive tracers may be used in conjunction with these tools to produce enhanced images of gravel packs and formations. | 01-21-2010 |
20100017135 | PRESSURE MEASUREMENT OF A RESERVOIR FLUID IN A MICROFLUIDIC DEVICE - Methods and related systems are described for measuring fluid pressure in a microchannel. A number of flexible membranes are positioned at locations along the microchannel such that pressure of the fluid in the microchannel causes a deformation of the membranes. An optical sensing system adapted and positioned to detect deformation of the membranes that thereby determine the pressure of the fluid flowing in the microchannel at a number of locations along the microchannel. | 01-21-2010 |
20100076688 | BOREHOLE CHARACTERIZATION - In some embodiments, apparatus and systems, as well as methods, may operate to acquire borehole standoff data ( | 03-25-2010 |
20100088033 | DATA ACQUISITION AND PROCESSING FOR INVASION PROFILE AND GAS ZONE ANALYSIS WITH NMR DUAL OR MULTIPLE INTERECHO SPACING TIME LOGS - A method for obtaining a parameter of interest related to an earth formation, the method including: obtaining nuclear magnetic resonance (NMR) data from an NMR tool investigating the earth formation with a plurality of pulse sequences of radio frequency energy, each pulse sequence having a unique frequency, a first train of pulses having a first interecho time (TE | 04-08-2010 |
20100145621 | COMBINING LWD MEASUREMENTS FROM DIFFERENT AZIMUTHS - Apparatus, methods for forming the apparatus, and methods for operating the apparatus provide a value for a formation property or a borehole property from measurements obtained in a well. The value may be generated from determining a weighted average of the value for the formation property or the borehole property using both values corresponding to different azimuths and weights corresponding to different azimuths. | 06-10-2010 |
20100161226 | SYSTEM AND METHOD FOR GRAVITY MEASUREMENT IN A SUBTERRANEAN ENVIRONMENT - A technique facilitates the collection of improved gravitational acceleration measurements and enables use of those measurements in analyzing environmental characteristics of a subterranean region. In one embodiment, a downhole tool is constructed with a gravimeter having a quantum source and an associated detector. The quantum source and detector use a velocity of the quantum source for determining gravitational acceleration measurements that can be employed in evaluating subterranean characteristics. | 06-24-2010 |
20100185394 | DEVICE FOR MEASURING A FLUID FLOW VELOCITY AND DIRECTION | 07-22-2010 |
20100223010 | Wide Band Gap Semiconductor Photodetector Based Gamma Ray Detectors for Well Logging Applications - A gamma ray detector uses a scintillation detector having a response that matches a response characteristic of a photodiode. The detector may be used to measure natural gamma rays and/or gamma rays produced by interaction of neutrons from a neutron source with the earth formation. | 09-02-2010 |
20100228483 | METHOD OF DETECTING GAS IN A FORMATION USING CAPTURE CROSS-SECTION FROM A PULSED NEUTRON DEVICE - Elemental analysis of an earth formation is performed using measurements from a gamma ray logging tool. From the elemental analysis, an estimate of the mineralogy of the formation is made. A prediction of the capture cross-section of the formation is made using the mineralogical analysis. The difference between the predicted capture cross-section and a measured capture cross-section is an indication of gas in the formation. | 09-09-2010 |
20100262371 | Systems and Methods for Evaluating Formations Having Unknown or Mixed Salinity - Formation fluid salinity is an important parameter in water saturation and formation porosity measurements. Systems and methods are disclosed herein to provide accurate water saturation and/or formation porosity measurements in the presence of unknown or highly variable salinity levels. Some logging tool assembly embodiments include a resistivity tool and an augmented neutron porosity tool. The neutron porosity tool is augmented with a gamma ray detector configured to measure the rate at which hydrogen nuclei capture neutrons from a neutron source. A processing system coupled to the logging tool assembly provides a salt compensated formation porosity log and/or a water saturation log. The logging tool assembly can also include a density logging tool and a natural gamma ray logging tool to provide a salt independent triple-combo log. | 10-14-2010 |
20100292927 | METHOD AND SYSTEM OF DETERMINING A VALUE INDICATIVE OF GAS SATURATION OF A FORMATION - Determining a value indicative of gas saturation of a formation. At least some of the illustrative embodiments are methods including obtaining an inelastic count rate and a capture count rate of a gamma detector for a particular borehole depth, calculating a ratio of an inelastic count rate to a capture count rate for the particular borehole depth, determining a value indicative of gas saturation based on the ratio of the inelastic count rate to the capture count rate for the particular borehole depth, repeating the obtaining, calculating and determining for a plurality of borehole depths, and producing a plot of the value indicative of gas saturation of the formation as a function of borehole depth. | 11-18-2010 |
20100312479 | USE OF CHEMICALLY AND GEOLOGICALLY CONSISTENT CONSTRAINTS FOR OBTAINING ELEMENTAL CHEMISTRY DOWNHOLE - A method for estimating a lithotype of an earth formation, the method includes: obtaining at least two different energy spectra of radiation received from the earth formation using the logging tool, each energy spectrum having at least one of a natural gamma-ray spectrum, a fast neutron-induced inelastic spectrum, and a thermal neutron induced capture spectrum; establishing at least one geochemically-based constraint related to elemental spectral yields to be determined; determining the elemental spectral yields from the at least two different energy spectra by decomposing the at least two different energy spectra over weighted sum of monoelemental standards wherein at least one weight is constrained by the at least one geochemically-based constraint and each weight represents a proportion of one monoelemental standard; converting the elemental spectral yields to elemental concentrations; and using a classifier to receive the elemental concentrations as input and to provide a lithotype as output. | 12-09-2010 |
20100332138 | PULSED NEUTRON BASED MONITORING OF CO2 IN ENHANCED RECOVERY AND SEQUESTRATION PROJECTS - A method for estimating a concentration of carbon dioxide (CO | 12-30-2010 |
20110010097 | BOREHOLE STRESS MODULE AND METHODS FOR USE - The disclosure is directed to methods and apparatuses for estimating a response relating to a formation by stressing a wall of a borehole during either wireline or while drilling deployment. The response may be estimated by stressing the wall of a borehole formed in the formation; and estimating a response of the borehole wall to the stress. The response may be estimated using a force module configured to induce the stress around borehole and a tool configured to estimate the response of the borehole wall to the stress. | 01-13-2011 |
20110029246 | Gamma Ray Detectors Having Azimuthal Sensitivity - An instrument for performing measurements downhole includes: at least one gamma-ray detector with azimuthal sensitivity equipped for discriminating energy of incident gamma-rays. This instrument is equipped with or without a neutron or gamma-ray source. A method and computer program product providing the azimuthal sensitivity of the instrument is provided. | 02-03-2011 |
20110040484 | Online measurement system of radioactive tracers on oil wells head - The online measurement system of radioactive tracers in oil wells head, object of this invention, is characterized by the use of new technology to measure concentrations of tracer activity in real time, using a radiation detector NaI (TI), with features that make it possible to detect up to three different tracers and be able to operate in temperature conditions up to 150° C., which allows to be immersed in a container with fluid coming from the flow stream, achieving with this to increase the sensitivity of the measurements. This system of measurement in the head of production wells will allow having much more data of the tracer activity, avoiding having to transport the operational staff to production wells to carry out sampling test, with all the advantages that this represents. | 02-17-2011 |
20110060526 | DOWNHOLE TOOL FOR DETERMINING FORMATION PROPERTIES - A downhole tool and method for determining properties of a formation. The method comprising irradiating the formation with a nuclear source; performing both a resistivity and a sigma measurement at each of different radial depths into the formation with a plurality of detectors; and inputting the measurements into a predetermined model for determining the properties of the formation. | 03-10-2011 |
20110066380 | SUBSURFACE RESERVOIR ANALYSIS BASED ON FLUID INJECTION - A subsurface reservoir may be characterized and/or monitored based on fluid injection. For example, fluid may be injected into the reservoir, and data (e.g., seismic data, geodetic data, pressure data) relating to the injected fluid in the reservoir may be used to identify characteristics of the reservoir and/or to monitor the injected fluid in the reservoir. In some aspects, air or another type of surrogate fluid is injected into the reservoir, and the reservoir's viability as a carbon dioxide sequestration site can be analyzed based on response data collected from the reservoir. In some aspects, carbon dioxide is sequestered in the subsurface reservoir, and three-dimensional geodetic response data is collected and used to monitor and/or facilitate quality control. | 03-17-2011 |
20110077867 | METHOD AND APPARATUS FOR DETERMINING FORMATION AND FLUID PROPERTIES - A downhole tool and method for determining a parameter of a formation as a function of radial distance from the borehole into the formation. The tool comprising a nuclear source for irradiating the formation and a plurality of sensors each independently measuring a density of the formation at a different radial depth into the formation. A processor combines the density measurements for determining the parameter of the formation as a function of radial distance. | 03-31-2011 |
20110087434 | MONITORING SYSTEM - There is provided a monitoring system ( | 04-14-2011 |
20110093200 | METHODS AND APPARATUS TO DETERMINE PHASE-CHANGE PRESSURES - Example methods and apparatus to determine phase-change pressures are disclosed. A disclosed example method includes capturing a fluid in a chamber, pressurizing the fluid at a plurality of pressures, measuring a plurality of transmittances of a signal through the fluid at respective ones of the plurality of pressures, computing a first magnitude of a first subset of the plurality of transmittances, computing a second magnitude of a second subset of the plurality of transmittances, comparing the first and second magnitudes to determine a phase-change pressure for the fluid. | 04-21-2011 |
20110137566 | Method and System of Processing Gamma County Rate Curves Using Neural Networks - Processing gamma count rate decay curves using neural networks. At least some of the illustrative embodiments are methods comprising obtaining a gamma count rate decay curve one each for a plurality of gamma detectors of a nuclear logging tool (the gamma count rate decay curves recorded at a particular borehole depth), applying the gamma count rate decay curves to input nodes of a neural network, predicting by the neural network a geophysical parameter of the formation surrounding the borehole, repeating the obtaining, applying and predicting for a plurality of borehole depths, and producing a plot of the geophysical parameter of the formation as a function of borehole depth. | 06-09-2011 |
20110137567 | Method and Apparatus to Incorporate Internal Gradient and Restricted Diffusion in NMR Inversion - Pulse sequences are applied to a fluid in an earth formation with an external static magnetic field and NMR spin echo signals are obtained. The received NMR signals are affected by internal field gradients due to a contrast in magnetic susceptibility between the grains of the formation matrix and the fluid in the pore space. Processing of the data gives the relaxation time and diffusivity of the fluid. | 06-09-2011 |
20110153216 | DETERMINATION OF IRREDUCIBLE WATER CUT-OFF USING TWO DIMENSIONAL NUCLEAR MAGNETIC RESONANCE DATA - A method for estimating a distribution of pore sizes of a fluid filled rock formation penetrated by a borehole, the method includes: processing nuclear magnetic resonance (NMR) data to determine a distribution of diffusion coefficients and a distribution of relaxation time constants for at least one depth in the borehole; plotting the distribution of diffusion coefficients and the distribution of relaxation time constants as a cross-plot for the at least one depth; identifying a water line on the cross-plot, each point on the water line having substantially the same value for the diffusion coefficient; and estimating the distribution of pore sizes from the distribution of relaxation time constants plotted along the water line. | 06-23-2011 |
20110172922 | Drop/Pump Memory Through-Casing Measurement Logging Tools - The present disclosure relates to apparatus and methods for evaluating an earth formation through a drillstring during tripping of the drillstring. The apparatus may include a logging instrument including a formation evaluation sensor configured to be dropped or pumped into a drillstring at the end of drilling. The logging instrument may be configured to make measurements through a homogenous portion of the drillstring while the drillstring is being tripped. The apparatus may include a memory and processor for logging data for later retrieval. The method may include making at least one measurement indicative of a property of an earth formation using a sensor operatively associated with a logging instrument, wherein the logging instrument is conveyed to proximate to a homogeneous portion of a drilling tubular using the drilling tubular. | 07-14-2011 |
20110191030 | APPARATUS AND ALGORITHM FOR MEASURING FORMATION BULK DENSITY - The present disclosure relates to borehole logging methods and apparatuses for estimating formation properties using nuclear radiation, particularly an apparatus and method for estimating bulk density of a formation. The method may include using gamma ray count rate information to model bulk density. The method may include using time-dependent ratios with a pulsed radiation source. The method may also include dividing gamma ray information by time and/or by energy window. The apparatus includes a processor and storage subsystem with a program that, when executed, implements the method. | 08-04-2011 |
20110218735 | Real-Time Lithology and Mineralogy Interpretation - Elemental analysis of an earth formation is obtained using measurements from a gamma ray logging tool. From only the elemental analysis and measurements of porosity, density and natural gamma rays, an estimate of the mineralogy of the formation is made treating the problem as one of minimizing a quadratic objective function subject to equality and/or inequality constraints. | 09-08-2011 |
20110224906 | Method and Apparatus for Neutron Porosity Measurement Using a Neural Network - A method of estimating formation porosity using a neural network for neutron porosity tools. In the training stage, the near-to-far ratio, environmental variables, such as mineralogy, borehole size, standoff etc., are fed to the inputs and the neural network is trained for obtaining the related true porosity (the output). The trained neural network is implanted into tool's firmware for the real time porosity measurement, accounting for the environmental effects considered during training | 09-15-2011 |
20110238313 | SYSTEM AND METHOD FOR CORRECTION OF BOREHOLE EFFECTS IN A NEUTRON POROSITY MEASUREMENT - Systems, methods, and devices for determining a porosity of a subterranean formation corrected for borehole effects are provided. One such device may be a downhole tool capable of being lowered into a borehole of a subterranean formation that may include a neutron source, two or more neutron detectors, and data processing circuitry. The neutron source may emit neutrons into the subterranean formation. The two or more neutron detectors may be respectively disposed at two or more azimuthal orientations within the downhole tool, and may detect neutrons scattered by the subterranean formation or borehole fluid in the borehole, or both. Based on the neutrons detected by the neutron detectors, the data processing circuitry may determine a porosity of the subterranean formation corrected for borehole effects. | 09-29-2011 |
20110276270 | METHOD TO DETERMINE CURRENT GAS SATURATION IN A NEAR-WELLBORE ZONE IN A VOLATILE OIL FORMATION - The invention is related to the development of volatile oil deposits and may be used to determine current gas saturation in a near-wellbore zone in a volatile oil formation. The method for the current gas saturation determination in the near-wellbore zone requires the measurement of the formation rock parameters and formation fluid parameters before the gas accumulation start in the near-wellbore zone and creation of the numerical model of the neutron logging signal change during the production period for the measured formation and formation fluid parameters and expected gas saturation value. During the production period when the well productivity decreases, neutron logging is performed and then the measured signals are matched with the model calculations and based on the provision of the best match of the measured and simulated neutron logging signals gas saturation is determined. | 11-10-2011 |
20110276271 | METHOD TO DETERMINE CURRENT CONDENSATE SATURATION IN A NEAR-WELLBORE ZONE IN A GAS-CONDENSATE FORMATION - The invention is related to the development of gas condensate deposits and may be used to determine current condensate saturation in the near-wellbore zone in the formation. The method for the current condensate saturation determination in the near-wellbore zone requires the measurement of the formation rock parameters and formation fluid parameters before the start of gas-condensate production and creation of the numerical model of the neutron logging signal change during the production period for the measured formation rock parameters and formation fluid parameters and expected condensate saturation value. During the production period when the well productivity decreases, neutron logging is performed and then the measured signals are matched with the model calculations and based on the provision of the best match of the measured and simulated neutron logging signals condensate saturation is determined. | 11-10-2011 |
20110307179 | METHOD OF EXTRACTING FORMATION DENSITY AND PE USING A PULSED ACCELERATOR BASED LITHO-DENSITY TOOL - A method for a pulsed gamma-gamma density tool to simultaneously compensate for interactions due to the photoelectric effect and density variations caused by standoff enables a more precise determination of bulk formation density. This method includes the steps of providing a source of energetic particles and directing those energetic particles at a formation having a known photoelectric factor and electron density and capturing one or more photons either emitted or deflected from the formation either a first detector or a second detector. The first detector is spaced a first distance from the source, the second detector is spaced a second distance from the detector and a third distance separates the first detector from the second detector. Measuring a first total energy of the photons striking the first detector during a time interval and measuring a second total energy of the photons striking the second detector as a function of the time interval and disposing a first filter between the first detector and the formation effective to cause Pe response to match standoff influence thereby compensating for both effects simultaneously. In addition to the first filter, the required compensation may include a second filter between the second detector and the formation as well as adjustments to the respective first distance, second distance and third distance. | 12-15-2011 |
20110313668 | NEUTRON POROSITY DEVICE AND MTHOD OF USE FOR REDUCTION OF THE LITHOLOGY AND ENVIRONMENTAL CORRECTIONS - Systems, methods, and devices for determining the porosity of a subterranean formation with reduced lithology error are provided. In one example, a downhole tool for such purposes may include a neutron source, a plurality of neutron detectors, and data processing circuitry. The neutron source may be configured to emit neutrons into a subterranean formation, and the plurality of neutron detectors may be configured to detect neutrons scattered from the subterranean formation. At least two of the plurality of neutron detectors may be disposed at different respective distances from the neutron source. The data processing circuitry may be configured to determine a porosity of the subterranean formation based at least in part on a weighted combination of the detector responses from each of the at least two of the plurality of neutron detectors. | 12-22-2011 |
20110313669 | SYSTEM AND METHOD FOR MATCHING LITHOLOGY RESPONSES OF DOWNHOLE TOOLS HAVING DIFFERENT SOURCE ENERGIES - Systems, methods, and devices for matching the lithology effect of a downhole tool having a lower-energy neutron source, such as AmBe, using a downhole tool having a higher-energy neutron source, such as an electronic neutron generator, are provided. One such downhole tool may include a neutron source, first and second neutron detectors, and data processing circuitry. The neutron source may emit neutrons into a subterranean formation, which may scatter off the formation. The first neutron detector may detect neutrons of a relatively lower spectrum of energies than the second neutron detector. From counts of these neutrons, the data processing circuitry may determine a property of the subterranean formation having a lithology effect that substantially matches another lithology effect associated with another downhole tool having a lower-energy neutron source. | 12-22-2011 |
20120010819 | APPARATUS AND METHOD FOR PULSED NEUTRON MEASUREMENT - A method of estimating at least one property of an earth formation includes: constructing a matrix model of a formation; constructing a shale model of the formation, the shale model including an estimation of a concentration of at least one trace element; combining the first model and the second model to generate a formation model; and comparing measured pulsed neutron data with the mixed model to estimate the at least one property. | 01-12-2012 |
20120016588 | Correction for Low Porosity Effects on Neutron Gamma Density - Systems, methods, and devices are provided to determine an accurate neutron-gamma density (NGD) measurement for a broad range of formations, including low-hydrogen-index or low-porosity formations and formations with heavy elements. For example, such an NGD measurement may be obtained by emitting neutrons into a formation such that some of the neutrons inelastically scatter off elements of the formation and generate inelastic gamma rays. The neutrons and inelastic gamma rays that return to the downhole tool may be detected. Some characteristics of certain formations are believed to affect the fast neutron transport of the formations. Thus, if a formation has one or more of such characteristics, a correction may be applied to the count rate of neutrons, the count rate of inelastic gamma rays, or the neutron transport correction function, upon which the neutron-gamma density (NGD) may be determined. | 01-19-2012 |
20120035851 | NMR-DNA FINGERPRINT - Pulse sequences are applied to a fluid in an earth formation in a static magnetic field and NMR spin echo signals are obtained. The signals are processed to give a distribution of relaxation time at each of the plurality of depths. A quasi-DNA is obtained by autoscaling and a nonlinear mapping of T | 02-09-2012 |
20120046867 | Portable System for Analyzing and Determining Elemental Composition of Rock Samples - A portable system for elemental analysis includes one or more neutron emitters, a chamber for containing a test sample, at least one gamma ray detector electrically connected to a data acquisition system, and software or firmware executing on the data acquisition system from a non-transitory physical medium, the software or firmware providing a first function for producing one or more gamma ray spectrums, a second function for applying correction factors to the one or more gamma ray spectrums, and a third function for analyzing the corrected gamma ray spectrum or spectrums to determine a deconvolved elemental composition of the test sample. | 02-23-2012 |
20120059587 | APPARATUS AND METHOD FOR MEASURING DOWNHOLE FLUID COMPOSITION AND PROPERTIES - A method of estimating fluid composition in an earth formation includes: generating at least one pulsed neutron measurement by a pulsed neutron tool; estimating a pulsed neutron fluid saturation by analyzing the at least one pulsed neutron measurement via a pulsed neutron model of the earth formation, the pulsed neutron model including expected pulsed neutron measurements relative to selected fluid composition and properties; comparing the pulsed neutron fluid saturation to a reference fluid saturation estimated via a downhole tool; adjusting the pulsed neutron model to at least substantially eliminate a difference between the pulsed neutron fluid saturation and the reference fluid saturation by adjusting at least one of the selected fluid composition and the selected fluid properties; and estimating at least one of the fluid composition and the fluid properties based on the adjusted model. | 03-08-2012 |
20120059588 | Elemental Concentration Determination Using Neutron-Induced Activation Gamma Radiation - The present disclosure relates to borehole logging methods and apparatuses for estimating formation properties using nuclear radiation, particularly an apparatus and method for estimating amounts of silicon and/or oxygen in the formation. The method may include using nuclear radiation information from at least one nuclear radiation detector to estimate at least one parameter of interest. The method may include separating a gross nuclear radiation count into separate nuclear radiation components. The method may also include reducing an error in the estimated formation properties due to speed variations of a nuclear radiation source that activates the silicon and oxygen in the formation. The apparatus may include at least one nuclear radiation detector. The apparatuses may include an information processing device to perform the methods. | 03-08-2012 |
20120059589 | Water Saturation Determination Using an Oxygen Estimate and Formation Lithology - The present disclosure relates to borehole logging methods and apparatuses for estimating formation properties using nuclear radiation, particularly an apparatus and method for estimating amounts of silicon and/or oxygen in the formation. The present disclosure includes estimating a formation property using an oxygen estimate and at least a formation lithology. The method may include using nuclear radiation information from at least one nuclear radiation detector generate the oxygen estimate. The apparatus may include at least one nuclear radiation detector. The apparatuses may include an information processing device to perform the methods. | 03-08-2012 |
20120065888 | Method and Apparatus for Predicting Petrophysical Properties From NMR Data in Carbonate Rocks - An apparatus and method for determining a property of an earth formation using a radial basis function derived from a catalog of rock samples. Parameters of a Thomeer capillary pressure fitting curve are derived and used for analyzing rocks with unimodal or multimodal pore size distributions. | 03-15-2012 |
20120101730 | METHOD AND APPARATUS UTILIZING NUCLEAR MAGNETIC RESONANCE MEASUREMENTS FOR ESTIMATING RESIDUAL CARBON DIOXIDE SATURATION IN AQUIFIERS - Percolation theory is applied to establish a connection between magnetization decay of nuclear magnetic resonance (NMR) measurements and residual carbon dioxide saturation (S | 04-26-2012 |
20120166087 | Method of Determining Density of Underground Formations Using Neutron-Gamma Ray Measurements - A method of determining the density of an underground formation surrounding a borehole from measurement of gamma rays arising from irradiation of the formation by a nuclear source in a tool body located in the borehole, and measurement of gamma-ray flux in the tool body at two different detector spacings from the source, the method comprising determining a substantially straight-line relationship between gamma-ray flux measurements at each different spacing with respect to the density of the formation for a tool body with no standoff; determining a relationship defining the deviation with respect to tool standoff of the density determined from the measured gamma-ray flux measurements at the two different detector spacings from the density calculated from the straight line relationships; and for a given pair of gamma-ray flux measurements at the different detector spacings, determining the intersection of the relationship defining the deviation with the straight line relationship so as to indicate the density of the formation surrounding the bore-hole; wherein the source is a neutron source and the gamma rays measured in the too! body are neutron-induced gamma rays resulting from neutron irradiation of the formation. | 06-28-2012 |
20120179378 | METHOD AND APPARATUS FOR MONITORING VIBRATION USING FIBER OPTIC SENSORS - A apparatus for monitoring a downhole component is disclosed. The apparatus includes: an optical fiber sensor including a plurality of sensing locations distributed along a length of the optical fiber sensor; an interrogation assembly configured to transmit an electromagnetic interrogation signal into the optical fiber sensor and receive reflected signals from each of the plurality of sensing locations; and a processing unit configured to receive the reflected signals, select a measurement location along the optical fiber sensor, select a first reflected signal associated with a first sensing location in the optical fiber sensor, the first sensing location corresponding with the measurement location, select a second reflected signal associated with a second sensing location in the optical fiber sensor, estimate a phase difference between the first signal and the second signal, and estimate a parameter of the downhole component at the measurement location based on the phase difference. | 07-12-2012 |
20120197529 | Optimization Of Neutron-Gamma Tools For Inelastic-Gamma Ray Logging - Systems, methods, and devices for inelastic gamma-ray logging are provided. In one embodiment, such a method includes emitting neutrons into a subterranean formation from a downhole tool to produce inelastic gamma-rays, detecting a portion of the inelastic gamma-rays that scatter back to the downhole tool to obtain an inelastic gamma-ray signal, and determining a property of the subterranean formation based at least in part on the inelastic gamma-ray signal. The inelastic gamma-ray signal may be substantially free of epithermal and thermal neutron capture background. | 08-02-2012 |
20120265443 | METHOD OF LOGGING A BOREHOLE AND RELATED APPARATUS - In a method of logging a geological formation, a neutron generator is pulsed to generate a series of neutron bursts that irradiate the formation. Mutually spaced radiation detectors are operated without counting or detecting individual pulses stimulated by a burst from the neutron generator. The detectors are located to detect neutrons that have traversed the formation and to generate respective current outputs indicative of the neutron detection at the respective detectors. The current outputs of the detectors are integrated to generate respective analog waveforms characteristic of the count rates at the detectors. Each of the analog waveforms is converted to digital form, and the respective digital waveforms are compared to establish a ratio of radiation detector count rates corresponding to the outputs of the respective radiation detectors. From the resulting ratio, a compensated measure of the neutron-based porosity of the formation is established. | 10-18-2012 |
20120277995 | SYSTEMS AND METHODS FOR DISTRIBUTED INTERFEROMETRIC ACOUSTIC MONITORING - Acoustic monitoring is carried out using a fiber optic cable. Coherent Rayleigh noise generated by the transmission of a coherent beam of radiation through the fiber optic cable is detected, a phase of the coherent Rayleigh noise is measured and the measured phase is processed to identify an acoustic occurrence along the fiber optic cable. In certain aspects, an optical fiber serves as a distributed interferometer that may be used to monitor a conduit, wellbore or reservoir. The distributed interferometric monitoring provides for accurate detection of acoustic occurrences along the fiber optic cable and these acoustic occurrences may include fluid flow in a pipeline or wellbore, processes taking place in a wellbore or pipeline, fracturing, gravel packing, or production logging. | 11-01-2012 |
20120290208 | METHOD AND APPARATUS FOR MEASURING CARBON DIOXIDE DISSOLVED IN SOLUTION AND WELLBORE MONITORING SYSTEMS BASED THEREON - A sensing apparatus (and corresponding method) for monitoring carbon dioxide dissolved in a liquid solution employs a crystal surrounded in part by a sample chamber such that, in use, the liquid solution is in direct contact with the crystal. | 11-15-2012 |
20120303280 | BOREHOLE INDEPENDENT NEUTRON POROSITY MEASUREMENT - A method for estimating a borehole independent porosity of a subterranean formation includes processing a neutron logging data point, preferably including average near and far detector neutron count rates with suitable input data to obtain the porosity estimate. The borehole independent formation porosity may be obtained without any compensation and without any reliance on the measurement or estimation of sensor standoff and/or borehole caliper. | 11-29-2012 |
20130018587 | HYDROCARBON DETECTION SYSTEM AND METHOD - A system and method for detecting hydrocarbon deposits includes a sensor that can measure radiation emanating from an earth surface within an area of interest and separate the measured radiation into component signals, each having a particular characteristic associated with the presence of hydrocarbon deposits. The system also includes a processor that can receive the component signals from the sensor, determine a difference between the component signals and a baseline radiation for the area of interest, and display data showing a likelihood of the presence of hydrocarbon deposits in locations within the area of interest based on the difference between the measured radiation and the baseline radiation. The processor may also generate maps of the area of interest. | 01-17-2013 |
20130073207 | Characterization Of Subterranean Formation Properties Derived From Quantitative X-Ray CT Scans Of Drill Cuttings - A method and a system are provided to characterize subterranean formations, which includes extracting drill cuttings from a drilling fluid, and grouping the drill cuttings into a group of cuttings based on a time of arrival of the drill cuttings at the Earth's surface, wherein these steps can be repeated at least once to provide a plurality of groups of drill cuttings that arrive sequentially at different recorded times that correspond to different downhole locations. | 03-21-2013 |
20130110404 | Methods and Systems of Formation Density Measurements in the Presence of Invasion of Drilling Fluids | 05-02-2013 |
20130116926 | FRACTURE CHARACTERIZATION BY INTERFEROMETRIC DRILLBIT IMAGING, TIME REVERSAL IMAGING OF FRACTURES USING DRILL BIT SEISMICS, AND MONITORING OF FRACTURE GENERATION VIA TIME REVERSED ACOUSTICS AND ELECTROSEISMICS - Apparatus, systems, and methods may operate to receive radiated energy as scattered energy after the radiated energy interacts with a geologic formation, wherein the scattered energy is received at a sub-surface multi-channel sensor array that operates to transform the scattered energy into received signals, and wherein the radiated energy is provided by a sub-surface source of elastic energy; and to identify discontinuous features in the geologic formation by interferometric comparison of the received signals as elastic signals and/or electromagnetic signals among some sensors in the sensor array, or by time-reversal propagation of the received signals as elastic and/or electromagnetic signals in a numeric model of a volume of the geologic formation. Additional apparatus, systems, and methods are disclosed. | 05-09-2013 |
20130124094 | METHOD AND SYSTEM OF DETERMINING ELEMENTAL CONTENT OF AN EARTH FORMATION - Determining elemental content of an earth formation. At least some of the illustrative embodiments are methods including: irradiating a portion of a formation that surrounds a borehole; counting gammas to obtain a spectrum of counted gammas; finding a solution to a system of equations based on the spectrum of counted gammas, which system of equations has a plurality of solutions, the solution being indicative of a plurality of weight percentages for a respective plurality of elements within the formation; determining whether the solution meets a predetermined constraint; repeating the finding and determining until a solution is found that is determined to meet the predetermined constraint; and producing an indication of the elemental content of the formation using the solution that meets the predetermined constraint. | 05-16-2013 |
20130158876 | COMBINING INELASTIC AND CAPTURE GAMMA RAY SPECTROSCOPY FOR DETERMINING FORMATION ELEMENTAL - A method for determining weight fractions of a plurality of elements in a subsurface formation penetrated by a wellbore includes determining weight fractions of a first plurality of elements using measurements of capture gamma rays made in the wellbore. The capture gamma rays result from bombardment of the formations with high energy neutrons. A weight fraction of a second plurality of elements is determined using measurements of inelastic gamma rays made in the wellbore resulting from bombardment of the formations with high energy neutrons. The weight fraction for the second plurality is determined by setting a transformation factor for those elements common to both the first and second plurality to result in a statistically equivalent weight fraction for the common elements as determined, for the first plurality of elements. Weight fractions of elements in the second plurality not common to the first plurality of elements is determined using the set transformation factor. | 06-20-2013 |
20130179081 | System and Algorithm for Automatic Shale Picking and Determination of Shale Volume - The present disclosure relates to borehole logging methods and apparatuses for estimating a parameter of interest of an earth formation using logging data acquired in a borehole penetrating the earth formation. The method may include estimating the at least one parameter of interest using a statistical analysis of logging data acquired by at least one sensor, wherein the statistical analysis is applied over interval plurality of intervals within the logging data. The logging data may include one or more of: gamma ray data and spontaneous potential data. The method may include acquiring logging data with the at least one sensor. The method may also include estimating a confidence level for the at least one estimated parameter. The apparatus may include at least one sensor configured to generate logging data information about an earth formation; and at least one processor configured perform at least some of the steps of the method. | 07-11-2013 |
20130211724 | IDENTIFICATION OF NEUTRON CAPTURE FROM A PULSED NEUTRON LOGGING TOOL - The present disclosure is intended to overcome the problem of hydrogen contamination of the density signal. The approach is to compute the neutron capture portion of the total gamma ray counts and subtract it from the total counts resulting in a pure inelastic gamma ray measurement. | 08-15-2013 |
20130253835 | LOG INVERSION METHOD FOR NUCLEAR LOG DATA OF EARTH FORMATIONS - Inverting nuclear log data for a geological formation surrounding a borehole involves acquiring nuclear log data for a borehole portion using a moveable nuclear logging tool and acquiring additional log data for the borehole portion using another logging device with superior resolution. Boundaries between adjacent zones are identified that exhibit an attribute of the geological formation to a detectably contrasting degree. From pre-acquired data describing one or more characteristics of the nuclear logging tool, a modelled log of the attributes is generated over the borehole portion, and a zone response is calculated from the pre-acquired data for each zone by using the boundaries to define an initial measure of the depth of each zone and ascribing a value of the attribute in dependence on the depth of each zone. The attribute of each zone is then calculated by deconvolving the nuclear log data using the zone response to minimize the difference between the nuclear log data and the convolution of the zone response and the attribute. | 09-26-2013 |
20130261973 | Carbonate Permeability by Pore Typing - A method for estimating a property of an earth formation includes: conveying a carrier through a borehole penetrating the earth formation; performing nuclear magnetic resonance (NMR) measurements on a sensitive volume in the formation using an NMR tool disposed at the carrier to provide a distribution of relaxation times; identifying peaks in the distribution of relaxation times; selecting at least one peak based on a characteristic of the at least one peak; and estimating the property using a relaxation time associated with the at least one peak. | 10-03-2013 |
20130261974 | LOGGING TOOL FOR DETERMINATION OF FORMATION DENSITY AND METHODS OF USE - Apparatus for wellbore logging and method of use are provided for measurement of the annular materials interposed between the logging tool and formation and the apparent formation bulk density in open-hole, cased-hole or other conduit. The logging tool can be centralized in the borehole. Non-collimated gamma radiation is emitted into the surrounding media and the amount of radiation which returns to the tool is measured by multiple omni-directional detectors spaced a pre-set distances from the source to provide multiple radial depths of investigation. The annular thickness and density of materials interposed between the logging tool and the formation may be determined from the detector responses and be used to derive the apparent formation bulk density. | 10-03-2013 |
20130268200 | SYSTEM AND METHOD TO PERFORM FORMATION IMAGING - A downhole imaging system performs imaging in a borehole penetrating a formation. The system includes a source configured to emit gamma radiation toward an area of the borehole. The system also includes a first plurality of detectors configured to detect backscattered radiation originating from the source. Based on a distance between the source and each of the first plurality of detectors, detection by the first plurality of detectors provides a density image of the area of the borehole. | 10-10-2013 |
20130268201 | FORMATION COMPOSITIONAL EVALUATION USING NORMALIZED DIFFERENTIAL DATA - A method for determining compositional data for fluids within a geological formation having a borehole therein may include collecting first and second dataset snapshots of the geological formation based upon measurements from the borehole at respective different first and second times, and with the borehole subject to fluid injection between the first and second times to displace fluids in the geological formation adjacent the borehole. The method may further include generating a differential dataset based upon the first and second dataset snapshots, normalizing the differential dataset to generate a normalized differential dataset, determining vertices defining a geometric shape and corresponding to respective different displaced fluid signatures based upon the normalized differential dataset, and determining displaced compositional data with respect to the different displaced fluid signatures based upon a position of a datapoint from the normalized differential dataset on the geometric shape. | 10-10-2013 |
20130268202 | METHOD AND APPARATUS UTILIZING NUCLEAR MAGNETIC RESONANCE MEASUREMENTS FOR ESTIMATING RESIDUAL CARBON DIOXIDE SATURATION IN AQUIFERS - Percolation theory is applied to establish a connection between magnetization decay of nuclear magnetic resonance (NMR) measurements and residual carbon dioxide saturation (S | 10-10-2013 |
20130311095 | MULTI-GAP INTERFEROMETRIC SENSORS - An apparatus for estimating a property includes a hollow core tube and an input light guide disposed at least partially within hollow core tube. The apparatus also includes a second gap disposed within the hollow core tube and separated from the input light guide by an air gap width. The second gap is formed of a first solid material and has a second gap width. The apparatus also includes a third gap disposed at least partially within the hollow core tube and being further from the input light guide than the second gap. The third gap is formed of a second solid material and has a third gap width. | 11-21-2013 |
20130338926 | FORMATION VOLUMETRIC EVALUATION USING NORMALIZED DIFFERENTIAL DATA - A method for determining volumetric data for fluid within a geological formation is provided. The method includes collecting first and second dataset snapshots of the geological formation based upon measurements from the borehole at respective different first and second times and generating a differential dataset based upon the first and second dataset snapshots. Multiple points are determined within the differential dataset, including a first point representing a first displaced fluid, a second point representing a second displaced fluid, and an injected fluid point that corresponds to properties of the injected fluid. A further third point is determined based on at least one other property of the displaced fluid, and a volumetric composition of the displaced fluids is determined based upon the differential dataset, the first point, and second point, and third point. | 12-19-2013 |
20130345983 | Method For Cement Evaluation With Neutron Logs - Method for evaluating cement integrity in a cased well environment using a logging tool that has a neutron source and one or more neutron or gamma ray detectors. Neutron porosity logs are obtained from the well before ( | 12-26-2013 |
20140005945 | Method For Estimation Of Borehole And Formation Properties From Nuclear Logging Measurements | 01-02-2014 |
20140019052 | DEVICE AND METHOD FOR PREDICTIVE CALIBRATION - A method of calibrating a measurement device includes: compiling historical calibration data for the measurement device, the historical calibration data including values corresponding to outputs of the measurement device over a first operating duration in environmental conditions associated with an operating environment; projecting the historical calibration data over a subsequent operating duration to generate predictive calibration data; disposing the measurement device in the operating environment and generating measurement signals during the first operating duration and the subsequent operating duration; and generating measurement values from measurement signals generated during the subsequent operating duration based on the predictive calibration data. | 01-16-2014 |
20140039794 | Evaluating Hydrologic Reservoir Constraint in Coal Seams and Shale Formations - Methods and apparatus suitable for quickly and accurately measuring | 02-06-2014 |
20140074405 | MODIFIED PULSE SEQUENCE TO ESTIMATE PROPERTIES - Methods and related systems are described for estimating fluid or rock properties from NMR measurements. A modified pulse sequence is provided that can directly provide moments of relaxation-time or diffusion distributions. This pulse sequence can be adapted to the desired moment of relaxation-time or diffusion coefficient. The data from this pulse sequence provides direct estimates of fluid properties such as average chain length and viscosity of a hydrocarbon. In comparison to the uniformly-spaced pulse sequence, these pulse sequences are faster and have a lower error bar in computing the fluid properties. | 03-13-2014 |
20140088876 | MULTI-SENSOR ANALYSIS OF COMPLEX GEOLOGIC MATERIALS - Systems and methods for analyzing an unknown geological sample are disclosed. The system may include at least two analytical subsystems, and each of the at least two analytical subsystems provides different information about the geological sample. The data sets from various analytic subsystems are combined for further analysis, and the system includes a chemometric calibration model that relates geological attributes from analytical data previously obtained from at least two analytical techniques. A prediction engine applies the chemometric calibration model to the combined analytical information from the geological sample to predict specific geological attributes in the unknown geological sample. | 03-27-2014 |
20140088877 | Formation Characterization For Fast Forward Neutron Models - A method for simulating a response of a neutron well logging instrument includes in a computer, defining a function of neutron migration length with respect to expected radiation detector counting rate. The function is defined for selected values of formation porosity. The function is related to neutron slowing down length and neutron diffusion length. The function is weighted for formation density. An expected radiation detector counting rate is calculated in the computer using the defined function based on an initial estimation of formation porosity and density. | 03-27-2014 |
20140100785 | NULL SPACE PROJECTION FOR SOURCELESS GAIN STABILIZATION IN DOWNHOLE GAMMA RAY SPECTROSCOPY - A method for gain control of a radiation detector includes measuring standard gamma ray spectra for known concentrations of selected radioactive materials found in earth formations. A standards matrix is calculated from the standard gamma ray spectra. A singular value decomposition is computed from a matrix related to measurements of gamma ray spectra, of formations and the standards matrix. A radiation, detector gain is computed from a minimum ratio of null space with respect to data value space of a subsurface formation measurement related matrix and the standards matrix. Gain of the radiation detector is adjusted based on the computed radiation detector gain. | 04-10-2014 |
20140129147 | Method of indicating the presence of gas hydrate and shallow gas in deepwater environment - A method for indicating the presence of free gas charged sands, and/or hydrates over free gas, and/or hydrates not over free gas, the method using well log data and a rock physics model. Velocity and density of background clays and sands are extracted from the well log data. The extracted velocities and densities are used to build a rock physics model. An AVO response is generated that is representative of free gas-charged sands. An AVO response is generated that is representative of hydrates over free gas-charged sands. An AVO response is generated that is representative of hydrates devoid of free gas. The generated AVO responses are used to construct an AVO crossplot diagram that is further used to distinguish deposits of free gas charged sands from hydrates over free gas, from hydrates not over free gas. | 05-08-2014 |
20140142856 | METHOD AND SYSTEM OF DETERMINING A VALUE INDICATIVE OF GAS SATURATION OF A FORMATION - Determining a value indicative of gas saturation of a formation. At least some of the illustrative embodiments are methods including: obtaining an inelastic count rate and a capture count rate of a gamma detector for a particular borehole depth; removing at least a portion of the chlorine response from the capture count rate, thereby creating a modified capture count rate; calculating a ratio of an inelastic count rate to the modified capture count rate for the particular borehole depth; determining a value indicative of gas saturation based on the ratio; and producing a plot of the value indicative of gas saturation as a function of borehole depth for a formation that the borehole at least partially penetrates. | 05-22-2014 |
20140180591 | Multi-Sensor Contamination Monitoring - A downhole sampling tool is operated to obtain formation fluid from a subterranean formation, which then flows through a flowline of the downhole sampling tool. Real-time density and optical density sensors of the downhole sampling tool are co-located proximate the flowline. Contamination of the formation fluid in the flowline is then determined based, at least in part, on the real-time density and optical density measurements obtained utilizing the co-located sensors. | 06-26-2014 |
20140214324 | Predicting Mineralogy Properties From Elemental Compositions - A method for predicting at least one property of a geological formation may include generating mapping function values relating a plurality of reference elemental compositions to corresponding reference properties thereof based upon at least one non-linear mapping function. The method may further include determining a sample elemental composition of at least one sample associated with the geological formation and performing, using a processor, an interpolation to map the sample elemental composition to at least one sample property based upon the mapping function values and the at least one non-linear function. | 07-31-2014 |
20140222343 | DISTRIBUTED FEEDBACK FIBER LASER STRAIN SENSOR SYSTEMS AND METHODS FOR SUBSURFACE EM FIELD MONITORING - A disclosed subsurface electromagnetic field monitoring system includes at least one fiberoptic cable to optically communicate measurements from an array of electromagnetic field sensors in a borehole. The array of electromagnetic field sensors includes a distributed feedback fiber laser strain sensor with electromagnetic field sensitivity | 08-07-2014 |
20140257704 | Apparatus and Method for Bed Boundary Detection - A method for performing detection of a bed boundary can include deploying a tool body with a longitudinal axis in a borehole, modulating the magnetic moments of electromagnetic signals to be transmitted by the first transmitter and the second transmitter, firing the first transmitter and the second transmitter substantially simultaneously, utilizing the receiver to receive and measure the modulated electromagnetic signals from the first transmitter and the second transmitter, and computing the orientation and location of the bed boundary based on the amplitudes and phases of the electromagnetic signals received and measured at the receiver. The tool body can be deployed with a first transmitter, a second transmitter, and a receiver, all of which are oriented in different directions. The vector of the total magnetic moment of the modulated electromagnetic signals can electrically rotate during firing. A corresponding apparatus for detection of a bed boundary is also provided. | 09-11-2014 |
20140278111 | BOREHOLE INSTRUMENT FOR BOREHOLE PROFILING AND IMAGING - A borehole instrument includes a housing sized and shaped to fit inside a borehole, at least one image sensor disposed within the housing and configured to capture images of an inside wall of the borehole, at least one illumination light source disposed within the housing and configured to illuminate the inside wall of the borehole, a laser light source disposed within the housing and configured to emit laser light towards the inside wall of the borehole, a data processing subsystem coupled to the image sensor and configured to receive image data from the image sensor, the image data representative of images of the inside wall of the borehole. The data processing subsystem is further configured to capture borehole profile data from images containing laser light reflected from the inside wall of the borehole. | 09-18-2014 |
20140330520 | METHOD AND SYSTEM OF RESIN EVALUATION USING PULSED NEUTRON TOOLS - Resin evaluation using pulsed neutron tool. At least some of the example embodiments are methods including: interrogating an area behind a casing material within a borehole with a plurality of neutrons; obtaining a count rate of inelastic gammas of a first gamma detector for a particular borehole depth, wherein the inelastic gammas comprise gammas emitted in inelastic collisions of the plurality of neutrons with matter behind the casing material; determining an inelastic carbon-oxygen ratio from the inelastic count rate of the first gamma detector; and determining an indication of the composition of the matter behind the casing material from the inelastic carbon-oxygen ratio from the inelastic count rate of the first gamma detector. | 11-06-2014 |
20140336936 | Sourceless Density Measurements With Neutron Induced Gamma Normalization - Methods, systems, devices, and products for estimating at least one parameter of interest of a volume of an earth formation, including density, porosity, and fluid saturation of the volume. Methods may include normalizing radiation information relating to radiation emissions from a spatially distributed nuclear source and indicative of a property of the earth volume using a correction factor determined using an estimated lithology of the volume. The nuclear source may be in the volume. Radiation emissions may be generated by neutron irradiation of at least one nuclide in the volume. The correction factor may be determined using any of nuclear density of the at least one nuclide; an estimated concentration of the at least one nuclide in the volume; or a parameter relating to concentration of the nuclide in the volume. The emissions may include gamma rays. | 11-13-2014 |
20140336937 | DOWNHOLE MAPPING SYSTEM - A downhole mapping system ( | 11-13-2014 |
20140343856 | Borehole Fluid Effect Correction For Pulsed Neutron Porosity Measurements - A method for determining formation hydrogen index includes using as input to a computer measurements of numbers of burst gamma rays (gamma rays detected during operation of a pulsed neutron source) and numbers of thermal neutron capture gamma rays made at two different axial spacings from the pulsed neutron source. A ratio of the numbers of burst gamma rays and a ratio of the numbers of thermal neutron capture gamma rays is determined. A corrected ratio of the numbers of thermal neutron capture gamma rays using the ratio of numbers of burst gamma rays is determined. The formation hydrogen index is determined from the corrected ratio. | 11-20-2014 |
20140343857 | Method For Measuring Formation Water Salinity From Within A Borehole - Methods and systems are described for using pulsed neutron ?-ray spectroscopy to measure formation water salinity from within a bore-hole. Through generating a cross-plot of database values of ratios of spectroscopically determined yields of hydrogen (H) and chlorine (Cl) from two detectors, deriving apparent salinities therefrom, formation and borehole water salinities can be determined. | 11-20-2014 |
20150039232 | Method of Correcting Mineral Ore Density Logs - A logging method includes carrying out respective density logs, using gamma detectors, along a length of borehole. The density log is corrected for the dimensions and properties of the borehole tubing, the method comprising correcting and combing the plurality of density logs obtained using a gamma ray source inside the tubing and relating to a length of well including the non-fixed tubing. | 02-05-2015 |
20150046091 | SYSTEM AND METHOD OF DETERMINING A VALUE INDICATIVE OF HYDROGEN INDEX - Determining a value indicative of hydrogen index. At least some of the example embodiments are methods including obtaining an inelastic count rate and a capture count rate of a first gamma detector for a particular borehole depth, obtaining an inelastic count rate and a capture count rate of a second gamma detector for the particular borehole depth, calculating a ratio of an inelastic count rate to a capture count rate for the first gamma detector, thereby creating a first value, calculating a ratio of an inelastic count rate to a capture count rate for the second gamma detector, thereby creating a second value, calculating a ratio of the first and second values, and determining a value indicative of hydrogen index based on the ratio of the first and second values. | 02-12-2015 |
20150315904 | Integrated Wellbore Caliper - Systems and methods are provided for an integrated caliper measurement obtained based on caliper measurements from at least two downhole tools. In one example, a system for obtaining such an integrated caliper includes several caliper tools and data processing circuitry. The caliper tools may respectively obtain caliper measurements of a wellbore. The data processing circuitry may assign respective weights to the respective caliper measurements and combine the weighted caliper measurements to obtain an integrated caliper measurement. The confidence factors may be determined based at least partly on at least two of a plurality of weighting functions. These weighting functions may each relate a confidence of the caliper measurements to an environmental or drilling characteristic occurring when the caliber measurements are obtained. | 11-05-2015 |
20150316678 | METHOD AND SYSTEM FOR QUALITY CONTROL IN GAMMA-GAMMA DATA DURING MINERAL EXPLORATION - A method for quality control of gamma-gamma well logging data within a borehole for mineral exploration, including receiving, at a computing device, raw well logging data; identifying and formatting data sets from the raw well logging data; applying at least one quality control process to the formatted data sets, the at least one quality control process being selected from: a linear verification process comparing linearity of density data readings between a long and a short spaced sensor in a probe; a density range verification process comparing density readings at the probe with density ranges for the borehole lithology; a diameter comparison process comparing actual diameter of the borehole at a depth with density readings at the depth; and a residual verification process for verifying a proportionality between densities measured by the long spaced sensor and short spaced sensor; compiling the results and providing an output of the compiled results. | 11-05-2015 |
20150331141 | Geological Constituent Estimation Using Calculated Spectra Relationships - A method for estimating at least one geological constituent may include obtaining a measured energy spectrum for the at least one geological constituent for a first borehole configuration, generating a calculated energy spectrum for the at least one geological constituent for the first borehole configuration, and generating a calculated energy spectrum for the at least one geological constituent for a second borehole configuration different than the first borehole configuration. The method may further include determining a relationship between the calculated energy spectra for the first and second borehole configurations, and generating an estimated energy spectrum for the at least one geological constituent for the second borehole configuration based upon the measured energy spectrum and the relationship between the calculated energy spectra for the first and second borehole configurations. | 11-19-2015 |
20150354353 | System And Method For Estimating Oil Formation Volume Factor Downhole - A system includes a downhole formation fluid sampling tool and a processor. An optical spectrometer of the downhole formation fluid sampling tool is able to measure an optical characteristic of a formation fluid flowing through the downhole formation fluid sampling tool over a plurality of wavelengths. The optical spectrometer generates optical spectra data indicative of this optical characteristic. The processor is designed to receive the optical spectra data generated by the optical spectrometer and to estimate a formation volume factor of the formation fluid based on the optical spectra data. | 12-10-2015 |
20150362617 | AZIMUTHAL GAMMA RESOLVER ASSEMBLY - An improved azimuthal gamma radiation measurement assembly configured to facilitate downhole measurement of naturally occurring radiation and the correlation of measurement information with highly accurate orientation information. The azimuthal gamma radiation measurement assembly includes a resolver section that receives azimuthal gamma sensor inputs, correlates those inputs with orientation information, and logs the combined data set for further evaluation. | 12-17-2015 |
20160032721 | Scattering Detection from Downhole Optical Spectra - Obtaining in-situ, at a first time, first optical spectral data associated with a formation fluid flowing through a downhole formation fluid sampling apparatus, and then obtaining in-situ, at a second time after the first time, second optical spectral data associated with the formation fluid flowing through the downhole formation fluid sampling apparatus. A wavelength-independent scattering intensity within the formation fluid flowing through the downhole formation fluid sampling apparatus is then determined based on the first and second optical spectral data, and a wavelength-dependent scattering intensity within the formation fluid flowing through the downhole formation fluid sampling apparatus is determined based on the first and second optical spectral data. | 02-04-2016 |
20160040531 | METHODS OF CHARACTERIZING EARTH FORMATIONS USING PHYSIOCHEMICAL MODEL - A formation is characterized by generating a model of the formation that characterizes the formation in a manner consistent with all measurements, thereby permitting a computation or prediction of how the formation will respond to disturbances or stimuli such as fluid injection for production, carbon-dioxide injection for sequestration, current injection, etc. The formation is described with a fundamental set of microscopic parameters such that quantities relevant to petrophysical response at a continuum or macroscopic level can be derived from them. Values for various formation parameters are determined, as are values for various field variables. | 02-11-2016 |
20160077234 | Compensated Sigma Calculation Based On Pulsed Neutron Capture Tool Measurements - A method for determining thermal neutron decay constant for a formation includes counting radiation events corresponding to numbers of thermal neutrons with respect to time (decay spectrum) after irradiating the formation with neutrons. At least one moment of a first order of the decay spectrum or a single exponential curve to fit the decay spectrum is determined. A first apparent decay constant from the at least one moment or the single exponential curve. A second apparent decay constant is determined either by repeating the calculating a moment or exponential curve for different time segments of the decay spectrum or by using radiation events detected by at least a second radiation detector at a different spacing from a position of the irradiating than the at least a first radiation detector to determine a second apparent decay constant. A wellbore corrected thermal neutron decay constant is determined from the first and second apparent decay constants. | 03-17-2016 |
20160084074 | DAS-BASED DOWNHOLE TOOL ORIENTATION DETERMINATION - A downhole tool orientation determination system to determine a radial orientation of a tool conveyed downhole into a pipe via a carrier and a method of determining a radial orientation of a tool conveyed downhole into a pipe via a carrier are described. The system includes an orientation tool conveyed downhole by the carrier that conveys the tool, and a distributed acoustic sensor (DAS). The DAS includes an optical fiber disposed axially along an outer surface of the pipe; and a processor to determine an orientation of the orientation tool with respect to the optical fiber based on a measurement by the optical fiber at different rotational positions of the orientation tool. The processor determines the radial orientation of the tool with respect to the optical fiber based on the orientation of the orientation tool with respect to the optical fiber. | 03-24-2016 |
20160177716 | Fluid Composition Using Optical Analysis and Gas Chromatography | 06-23-2016 |
20160252648 | INVERSION-BASED WORKFLOW FOR CONSISTENT INTERPRETATION OF NUCLEAR DENSITY IMAGES IN HORIZONTAL WELLS | 09-01-2016 |
20220137254 | PHOTOELECTRIC ABSORPTION CORRECTION FOR WELLBORE LOGGING - A system is disclosed for correcting Uranium-free gamma logs. The system may receive data about a subterranean formation from a gamma-ray-logging process in a wellbore. The system may apply a photoelectric-suppression estimator to the data to determine a photoelectric-suppression factor using stored mud parameters and a wellbore diameter value. The data may be corrected by the system by using the photoelectric-suppression factor to generate a Uranium-free, gamma-ray log. The system may output the Uranium-free, gamma-ray log for determining characteristics of the subterranean formation. | 05-05-2022 |