Class / Patent application number | Description | Number of patent applications / Date published |
324345000 | By magnetic means | 71 |
20090039890 | ARRANGEMENT FOR OPERATING A GEOPHYSICAL LOCATING DEVICE - The invention relates to an arrangement for operating a geophysical locating device by means of evaluating magnetic field changes, comprising flux gate sensors, an amplifying circuit as well as an evaluating and display unit. | 02-12-2009 |
20090315563 | Detection of Resistivity of Offshore Seismic Structures Mainly Using Vertical Magnetic Component of Earth's Naturally Varying Electromagnetic Field - The invention measures the vertical component Hz of a magnetic field arising from natural sources (MT) simultaneously at a plurality of points ( | 12-24-2009 |
20100001736 | FLOW TRACKING IN BLOCK CAVING MINING - The invention provides a method and system for monitoring the flow of ore in block cave mining operations by inserting an active magnetic beacon | 01-07-2010 |
20100026304 | Method and Apparatus for Analysing Geological Features - An apparatus ( | 02-04-2010 |
20100085056 | MAGNETO-RESISTANCE BASED TOPOGRAPHY SENSING - A topography sensor and method include a probe configured to traverse a surface to determine a topography. A stray magnetic field is disposed in proximity to the probe. A magneto-resistive sensor is configured so that the stray magnetic field passing through it changes in accordance with positional changes of the probe as the probe tip traverses the surface. | 04-08-2010 |
20100231222 | VERY LOW NOISE MAGNETOMETER - Disclosed herein is a very low noise fundamental mode orthogonal fluxgate magnetometer. Also disclosed is a method of measuring a magnetic field, and an integrated magnetotelluric station that can measure X, Y, and Z components of a magnetic field. | 09-16-2010 |
20100244843 | Geophysical prospecting using rotationally invariant parameters of natural electromagnetic fields - A geophysical survey method and system that comprises: measuring along multiple axes at multiple locations within a survey area magnetic field components of a low frequency magnetic field resulting from naturally occurring electromagnetic sources using a first sensor system; measuring along multiple axes magnetic field components of a low frequency magnetic field resulting from naturally occurring electromagnetic sources using a second sensor system; and receiving information about the magnetic field components measured by the first sensor system and the second sensor system and in dependence thereon computing parameters from the received information that are independent of rotation of the first sensor system or the second sensor system about any axis thereof. | 09-30-2010 |
20110031973 | GEOPHYSICAL MEASUREMENT DEVICE FOR NATURAL SOIL RESOURCE EXPLORATION IN AQUATIC ENVIRONMENT - A geophysical measurement device is provided for exploration of natural resources of the floor in an aquatic domain. The device includes a frame designed to rest in a stable manner on the floor of the aquatic environment, at least one buoyancy caisson resting on the frame, measurement instruments. The measurement instruments including: at least one sensor making it possible to measure locally at least one of the components of the magnetic field; an analogue and/or digital data acquisition and processing device; and a source of energy supply of the sensor and of the data acquisition and processing device. The at least one sensor is contained inside the buoyancy caisson. | 02-10-2011 |
20110133741 | SYSTEM AND METHOD FOR EMPLOYING ALTERNATING REGIONS OF MAGNETIC AND NON-MAGNETIC CASING IN MAGNETIC RANGING APPLICATIONS - A system and methods for facilitating drilling and/or drilling a well in an orientation with respect to an existing well are provided. Specifically, one method in accordance with present embodiments is directed to producing a magnetic field with a magnetic field source positioned in a non-magnetic region of casing within a first well, wherein the first well is cased with alternating regions of magnetic casing and non-magnetic casing. The method may also include producing at least one output from at least one magnetic field sensor capable of sensing directional magnetic field components, wherein the at least one output is based on detection of the magnetic field and wherein the at least one magnetic field sensor is positioned in a second well. | 06-09-2011 |
20110221444 | Determining Earth Properties - A method of determining ground properties comprises the steps of transmitting magnetic waves through the ground from a first location (A) to a second location (B), comparing the magnetic waves received at the second location with the magnetic waves transmitted at the first location so as to determine the attenuation of the ground, and deriving the ground properties from the attenuation thus determined. The magnetic waves are transmitted at multiple frequencies so as to determine a frequency dependency of the attenuation. | 09-15-2011 |
20110241688 | METHOD OF DETERMINING THE MAXIMUM TEMPERATURE UNDERGONE BY A SEDIMENTARY ROCK, ESPECIALLY IN THE FIELD OF HYDROCARBON FORMATION - A method of determining the maximum temperature undergone by a specimen of sedimentary rock during natural heating over a geological process, within the range from 60° C. to 230° C. approximately. The method includes analysis at very low temperature, down to a few kelvin, for example down to 10 kelvin, of the magnetic transitions intended to characterize an iron oxide and an iron sulfide that are formed or destroyed in the specimen by the geological heating of the sediment; and determination of the maximum temperature undergone by the specimen, using a calibration obtained by measuring the same magnetic parameters on the same sediment or on other sediments of the same nature, heated beforehand in the laboratory to known temperatures. | 10-06-2011 |
20110304338 | UNDERGROUND ELECTROMAGNETIC EXPLORATION METHOD - An underground electromagnetic exploration method that uses an induced current generating transmitter | 12-15-2011 |
20120001638 | Assembly and Method for Identifying a Ferrous Material - In one aspect of the present invention, a system assembly for identifying a ferrous material comprises a plurality of magnetometers spaced at varying distances from a ferrous material. Each of the plurality of magnetometers may comprise a sensor reading of a magnitude of an absolute magnetic field, which comprises a magnetic field created by the ferrous material and an ambient magnetic field. One of the plurality of magnetometers may be designated as a primary magnetometer. A distance to the ferrous material from the primary magnetometer may be determined by forming a ratio of the differences in the sensor reading of the primary magnetometer and the sensor readings of the other magnetometers set equal to a ratio of the differences in the distance to the ferrous material from the primary magnetometer inversely cubed and the distances to the ferrous material from the other magnetometers inversely cubed. The system assembly may also comprise a picture taking device that may provide an image of a surface viewable from above the ferrous material and a global positioning system device that may provide a map of a geographical region. | 01-05-2012 |
20120212229 | AZIMUTHALLY SENSITIVE RESISTIVITY LOGGING TOOL - Various systems and methods for implementing an azimuthally sensitive resistivity logging tool are disclosed. One such method involves transmitting a primary magnetic field from one or more coils placed on a drill collar and receiving several electrical signals, where each of the electrical signals is received from a respective one of several sensors. The sensors are distributed around a circumference of a drill collar, and an axis of at least one of the sensors is perpendicular to an axis of the drill collar. Each of the electrical signals indicates a respective magnitude of a measurement of a reflected magnetic field, where the reflected magnetic field is reflected from an anomalous geological formation. The method calculates a vector measurement of the reflected magnetic field, based upon the electrical signals. | 08-23-2012 |
20120262179 | ELECTROMAGNETIC AND ITS COMBINED SURVEYING APPARATUS AND METHOD - An electromagnetic and its combined surveying apparatus and method, utilizing small-sized one or three-dimensional magnetic field sensors with high dynamic range and high sensitivity, which can be used together with highly populated receivers for the electromagnetic exploration. The electrical field could be derived from the vertical component of the magnetic field of the highly populated receivers and the magneto-telluric data could be derived by measuring the three components of the magnetic data. Moreover, by means of connecting the same populated receivers with geophones or MEMS accelerometers, and moving the seismic sources together with the mobile electromagnetic source, seismic survey could be carried out. It is therefore able to undertake the interpretation of the seismic, electromagnetic and magneto-telluric data and perform a combined field exploration | 10-18-2012 |
20120306501 | METHODS FOR MAGNETIC IMAGING OF GEOLOGICAL STRUCTURES - Methods for imaging geological structures include injecting magnetic materials into the geological structures, placing at least one magnetic probe in a proximity to the geological structures, generating a magnetic field in the geological structures and detecting a magnetic signal. The at least one magnetic probe may be on the surface of the geological structures or reside within the geological structures. The methods also include injecting magnetic materials into the geological structures, placing at least one magnetic detector in the geological structures and measuring a resonant frequency in the at least one magnetic detector. Methods for using magnetic materials in dipole-dipole, dipole-loop and loop-loop transmitter-receiver configurations for geological structure electromagnetic imaging techniques are also disclosed. | 12-06-2012 |
20130307547 | GEOMAGNETIC APPLICATION DEVICE - A geomagnetic application device including a triaxial magnetic sensor, a measurement point acquiring mechanism, a calibration mechanism calibrating offset of the magnetic sensor, and an azimuth calculator. The calibration mechanism includes an offset calculation measurement point selector selecting at least six measurement points of the geomagnetic vectors from among a data set stored in the measurement point storage unit by the measurement point acquiring mechanism and storing the selected measurement points in an offset calculation measurement point storage unit. The offset calculation measurement point selector selects the measurement points from among the data set stored in the measurement point storage unit to include at least six points, component values of which are maximum or minimum in each of three orthogonal axes. | 11-21-2013 |
20140218038 | METHOD AND SYSTEM FOR MAPPING A GEOLOGICAL STRUCTURE OF A FORMATION ON ONE SIDE OF A SURFACE USING MAGNETIC MOMENTS OF DIFFERENT VALUES - A method for mapping geological structures of a formation on a side of a surface, includes: generating a magnetic moment using at least one magnetic moment generator to build up a magnetic field in the formation in an on-period, wherein the magnetic moment has a moment strength, and wherein the magnetic moment is positioned on another side of the surface; changing the magnetic moment to change the magnetic field; and making at least one record in a recording device at a recording time t | 08-07-2014 |
20140320134 | Electroacoustic Method of Conductivity Measurement Through Casing - The present disclosure relates to methods and apparatuses for evaluating a porous earth formation. The method may include estimating a value of at least one parameter of interest of the earth formation using a signal indicative of acoustic waves generated at a metallic surface ( | 10-30-2014 |
20140354284 | EARTH SURVEYING FOR IMPROVED DRILLING APPLICATIONS - Methods and apparatuses for geophysical surveying are disclosed. In one embodiment, a marine vehicle may obtain magnetic measurements in a location around a drilling site. The magnetic measurements may be used to calculate a localized disturbance magnetic field resulting from, for example, solar flares. The localized disturbance magnetic field may be used to calculate a declination value and, thus, a wellbore position with improved accuracy. | 12-04-2014 |
20150028875 | METAL DETECTION METHOD, METAL DETECTION DEVICE, METAL DETECTION METHOD FOR WIRELESS POWER SUPPLY DEVICE, AND WIRELESS POWER SUPPLY DEVICE - Provided are a metal detection method, a metal detection device, a metal detection method for a wireless power supply device, and a wireless power supply device which are capable of accurately detecting whether an object is a metal or a nonmetal. An oscillation circuit ( | 01-29-2015 |
20150338544 | DETERMINATION DEVICE, ELECTRICAL DEVICE, AND METHOD OF DETERMINING MOVING STATE - A determination device includes a geomagnetism value obtaining unit for obtaining a geomagnetism value detected with a geomagnetism sensor; and a geomagnetism value determining unit for determining a type of moving object among a plurality of types of moving objects according to the geomagnetism value obtained with the geomagnetism value obtaining unit. | 11-26-2015 |
20160108718 | HIGHLY PRESSURE-RESISTANT COOLING CONTAINER FOR SENSOR AND UNDERGROUND PROBING EQUIPMENT - To cool a SQUID to a stable operational temperature for a long period of time under high pressure that exceeds 1.0 MPa, a highly pressure-resistant cooling container for a sensor includes a pressure-resistant airtight container having a pressure-resistance performance of 1.0 MPa or higher, a phase transition coolant insulating container contained within the pressure-resistant airtight container, and a tube for releasing a phase transition coolant having a pressure-resistance performance of 1.0 MPa or higher and connected to the pressure-resistant airtight container. | 04-21-2016 |
20160154135 | A High Precision Field Measurement Method for Geomagnetic Vectors and a Device Thereof | 06-02-2016 |
20160377763 | Multifunction Snowpack Measurement Tool - The present disclosure is directed at a snowpack measurement device that is configurable between a skiing configuration, in which it can be used as a ski pole, and a snowpack measurement configuration, in which it can be used as a probe to measure one or more characteristics of a snowpack. In some embodiments, the device can wirelessly transmit snowpack measurement results, for example, to a user's mobile device. The device can house sensitive electronics and sensors for the snowpack measurement tool within a ski pole handle of the device when not in use. | 12-29-2016 |
324346000 | Within a borehole | 46 |
20080290876 | Method of characterizing hydrocarbon reservoir fractures in situ with artificially enhanced magnetic anisotropy - Reservoir fractures are characterized directly in situ without need to acquire and analyze formation sample cores. A magnetic fluid is injected into an isolated section of the reservoir. The magnitude and directional properties of the enhanced magnetic susceptibility in the section where magnetic fluid injection occurs is measured with a down hole magnetometer. Logs obtained of the enhanced magnetic susceptibility are analyzed to characterize fractures, and petrophysical properties of interest, such as porosity, permeability, and permeability anisotropy of the formation in the vicinity of the fluid injection. | 11-27-2008 |
20090201025 | Magnetization of Target Well Casing String Tubulars for Enhanced Passive Ranging - A method for magnetizing a wellbore tubular is disclosed. The method includes magnetizing a wellbore tubular at three or more discrete locations on the tubular. In exemplary embodiments the magnetized wellbore tubular includes at least one pair of opposing magnetic poles located between longitudinally opposed ends of the tubular. Wellbore tubulars magnetized in accordance with this invention may be coupled to one another to provide a magnetic profile about a section of a casing string. Passive ranging measurements of the magnetic field about the casing string may be utilized to survey and guide drilling of a twin well. Such an approach advantageously obviates the need for simultaneous access to both wells. | 08-13-2009 |
20090201026 | Method of Magnetizing Casing String Tubulars for Enhanced Passive Ranging - A method for magnetizing a wellbore tubular includes magnetizing the tubular at three or more discrete locations on the tubular. In exemplary embodiments the magnetized wellbore tubular includes at least one pair of opposing magnetic poles located between longitudinally opposed ends of the tubular. Wellbore tubulars magnetized in accordance with this invention may be coupled to one another to provide a magnetic profile about a section of a casing string. Passive ranging measurements of the magnetic field about the casing string may be utilized to survey and guide drilling of a twin well. Such an approach advantageously obviates the need for simultaneous access to both wells. | 08-13-2009 |
20100033187 | METHOD FOR ELIMINATING BOREHOLE ECCENTRICITY EFFECT IN TRANSVERSAL INDUCTION SENSOR - An instrument for measuring a property of a subsurface material, the instrument including: a magnetic material surrounding a volume in at least two dimensions; and a receiver adapted for receiving energy related to the property of the subsurface material; wherein the receiver is disposed at an exterior surface of the magnetic material. | 02-11-2010 |
20100134113 | SINGLE-WELL THROUGH CASING INDUCTION LOGGING TOOL - Methods and related systems are described for making electromagnetic measurements of a subterranean rock formation through a conductive casing of a borehole. A number of transmitters/receivers are deployed into single well having a conductive casing. A magnetic field is induced through the conductive casing and into a surrounding subterranean rock formation, and the magnetic field is detected by the receivers. The receivers have main windings, feedback winding and bucking windings. One of the receiver coils in the tool string is excited at a time, and induced voltages at all of the other receiver coils, either in straight mode, or in feedback mode, are measured. | 06-03-2010 |
20100194395 | ENHANCED PASSIVE RANGING METHODOLOGY FOR WELL TWINNING - A method for drilling substantially parallel twin wells includes drilling a first well and deploying a casing string in the first well. A magnetized section of the casing string includes a plurality of magnetized wellbore tubulars having at least one pair of opposing magnetic poles located between longitudinally opposed ends of the wellbore tubular. A portion of a second well is drilled within sensory range of magnetic flux from the magnetized section of the casing string. The local magnetic field is measured in the second well and processed to determine a direction for subsequent drilling. Drilling proceeds along the direction for subsequent drilling. | 08-05-2010 |
20100219835 | Non-magnetic transmitter housing - A sonde assembly of the invention includes: a sonde housing in the form of a non-magnetic tube having windows therein for permitting a radio signal to be transmitted out the tube from the inside; | 09-02-2010 |
20110050234 | Resonance Method for Measuring Water-Oil Ratio, Conductivity, Porosity, Permeability and Electrokinetic Constant in Porous Formations - A shear wave is generated at a borehole wall. A static magnetic field is applied with a radial direction and an oscillating magnetic field is applied tangential to the borehole wall. The frequency of the oscillating field is varied until a resonance condition occurs. Motion of the formation under resonance provides an indication of a resistivity property of the earth formation. | 03-03-2011 |
20110080172 | TRANSMITTER SYSTEM, METHOD OF INDUCING A TRANSIENT ELECTROMAGNETIC FIELD IN AN EARTH FORMATION, METHOD OF OBTAINING A TRANSIENT ELECTROMAGNETIC RESPONSE SIGNAL, AND METHOD OF PRODUCING A HYDROCARBON FLUID - A transmitter system for inducing a transient electromagnetic field in an earth formation comprises an inductive element to generate an electromagnetic field in response to a flow of electric current through the inductive element. Furthermore, switching means arranged to interrupt the flow of electric current through the inductive element, which switching means comprises a primary switch and an auxiliary switch arranged in series connection with each other. The auxiliary switch has a lower breakdown voltage than the primary switch. This induces a transient electromagnetic field in the earth formation. Delay circuitry may impose a time delay between switching of the auxiliary switch relative to switching of the primary switch. A transient electromagnetic response signal may be recorded, and used in a method of producing a mineral hydrocarbon fluid. | 04-07-2011 |
20110084697 | STEERABLE MAGNETIC DIPOLE ANTENNA FOR MEASUREMENT WHILE DRILLING APPLICATIONS - A steerable, magnetic dipole antenna for Measurement-While-Drilling (MWD) or Logging-While-Drilling (LWD) applications. The antenna elements use a hole arrangement in addition to grooves in a steel tool body, which is typically a drill collar. This antenna embodiment is extremely robust, meaning that does not significantly reduce the structural integrity of the tool body in which it is disposed. The antenna embodiment is also relatively wear resistant. The resultant magnetic dipole generated by this antenna is also electrically steerable in inclination angle from a common origin. A variable dipole moment inclination angle combined with independently measured tool rotation orientation during normal drilling allows the antenna to generate a magnetic dipole moment that may be directed at any three dimensional angle and from a common origin point at the centroid of the antenna. | 04-14-2011 |
20110084698 | STEERABLE MAGNETIC DIPOLE ANTENNA FOR MEASUREMENT WHILE DRILLING APPLICATIONS - A steerable, magnetic dipole antenna for Measurement-While-Drilling (MWD) or Logging-While-Drilling (LWD) applications. The antenna elements use a hole arrangement in addition to grooves in a steel tool body, which is typically a drill collar. This antenna embodiment is extremely robust, meaning that does not significantly reduce the structural integrity of the tool body in which it is disposed. The antenna embodiment is also relatively wear resistant. The resultant magnetic dipole generated by this antenna is also electrically steerable in inclination angle from a common origin. A variable dipole moment inclination angle combined with independently measured tool rotation orientation during normal drilling allows the antenna to generate a magnetic dipole moment that may be directed at any three dimensional angle and from a common origin point at the centroid of the antenna. The antenna can also be embodied to be more sensitive to resitivity in a particular azimuthal direction. | 04-14-2011 |
20110084699 | STEERABLE MAGNETIC DIPOLE ANTENNA FOR MEASUREMENT-WHILE-DRILLING APPLICATIONS - A steerable or non-steerable, magnetic dipole antenna for Measurement-While-Drilling (MWD) or Logging-While-Drilling (LWD) applications. The antenna elements use a hole arrangement in addition to grooves in a steel tool body, which is typically a drill collar. This antenna embodiment is extremely robust, meaning that does not significantly reduce the structural integrity of the tool body in which it is disposed. The antenna embodiment is also relatively wear resistant. The resultant magnetic dipole generated by this antenna is also electrically steerable in inclination angle from a common origin. A variable dipole moment inclination angle combined with independently measured tool rotation orientation during normal drilling allows the antenna to generate a magnetic dipole moment that may be directed at any three dimensional angle and from a common origin point at the centroid of the antenna. The antenna can also be embodied to be more sensitive to resistivity in a particular azimuthal direction. | 04-14-2011 |
20110298462 | METHOD AND APPARATUS FOR CALIBRATING AND CORRECTING FOR COHERENT NOISE IN CASING DETECTION - Systems and methods for improved acquisition of magnetic field data for magnetic ranging while drilling are provided. In one embodiment, such a system may include a borehole assembly and data processing circuitry. The borehole assembly may include an electric current driving tool configured to cause a current to flow across a drill collar of the borehole assembly and an internal magnetometer disposed within the drill collar and between the insulated gap and an end of the borehole assembly, which may be configured to measure magnetic field signals that penetrate the drill collar. The data processing circuitry may be configured to remove all or part of a noise component of the magnetic field signals that arises due to an eccentricity in the drill collar | 12-08-2011 |
20120013339 | Electromagnetic Orientation System for Deep Wells - An electromagnetic method and apparatus for determining the azimuthal orientation of a drill bit instrumentation sub ( | 01-19-2012 |
20120062235 | DOWNHOLE SENSOR ASSEMBLY AND METHOD OF USING SAME - A sensor assembly for sensing downhole parameters is provided. The sensor assembly is positionable in a downhole tool deployable into a subterranean formation to form a wellbore. The sensor assembly includes a carrier positionable in the downhole tool, at least one set of three accelerometers, and at least one set of three magnetometers. The carrier includes at least one set of three receptacles. The three receptacles are positioned radially about a periphery of the carrier at equal distances thereabout. The set of three accelerometers are correspondingly positionable in the at least one set of three receptacles, and the set of three magnetometers are correspondingly positionable in the at least one set of three receptacles. The set of three magnetometers includes two physical magnetometers and one virtual magnetometer. The virtual magnetometer is produced from the two physical magnetometers. | 03-15-2012 |
20120086456 | METHOD AND APPARATUS FOR ESTIMATING VISCOSITY AND DENSITY DOWNHOLE USING A RELAXED VIBRATING ELECTRICALLY CONDUCTIVE ELEMENT - An apparatus and method for estimating a parameter of interest in a downhole fluid using a fluid analyzer. The fluid analyzer may include: a electrically conductive element configured to vibrate in response to an energy source, a housing to enclose the electrically conductive element and receive a fluid, and a sensor configured to respond to shear waves induced in the fluid by the vibration of the electrically conductive element. The electrically conductive element may be relaxed during operation. Also disclosed is a method of use for the apparatus. | 04-12-2012 |
20120133367 | Fracture Characterization Using Directional Electromagnetic Resistivity Measurements - A disclosed fracture characterization method includes: collecting three-dimensional resistivity measurements of a volume surrounding an open borehole; analyzing the measurements to determine parameters describing fractures in the volume; and providing a report to a user based at least in part on said parameters. A fluid with a contrasting resistivity is employed to make the fractures detectable by a directional electromagnetic logging tool in the borehole. illustrative parameters include fracture direction, height, extent, length, and thickness. The resistivity measurements can be augmented using a borehole wall image logging tool. Also disclosed are fracturing methods that include: positioning a directional electromagnetic logging tool proximate to a formation; fracturing the formation; monitoring fracture progression with said tool; and halting the fracturing when measurements by said tool indicate that a predetermined set of criteria have been satisfied. | 05-31-2012 |
20120133368 | Reservoir Navigation Using Magnetic Field of DC Currents - A method and apparatus for steering a drilling assembly within a reservoir of an earth formation is disclosed. The drilling assembly is positioned within the reservoir between a conductive upper layer having a DC magnetic field and a conductive lower layer having a DC magnetic field. A sensor of the drilling assembly measures a magnetic field in the reservoir resulting from the DC magnetic field of the conductive upper layer and the DC magnetic field of the conductive lower layer. A processor uses the measured magnetic field to steer the drilling assembly within the reservoir. | 05-31-2012 |
20120139543 | METHODS FOR IMPROVED ACTIVE RANGING AND TARGET WELL MAGNETIZATION - A method for magnetizing a portion of a pre-deployed casing string includes deploying an electromagnetic array in a cased wellbore and energizing the array. The array includes a plurality of axially spaced electromagnets and is configured to generate a magnetic field pattern having at least first and second pairs of magnetically opposing poles. Passive ranging measurements of the induced magnetic field may be advantageously utilized, for example, to survey and guide continued drilling of a twin well. The electromagnetic array may also be used in active ranging applications. An array of permanent magnets providing a similar magnetic field pattern may also be used in active ranging applications. | 06-07-2012 |
20120194195 | Magnetic Ranging Method and Apparatus - A method and system is provided for minimizing delays in a magnetic ranging method. Delays are minimized by establishing synchronicity between triggering of a three-axis magnetometer and energisation of a solenoid assembly deployed in the borehole being drilled and the first borehole, respectively. Synchronicity enables measuring various components of the alternating magnetic field created by energisation of the solenoid assembly by the magnetometer, the moment the solenoid assembly is energised. The recorded components are used for computation of steering data for drilling the second borehole relative to the first borehole. The steering data can be determined at the surface or downhole. | 08-02-2012 |
20120299595 | HIGH RESOLUTION RESISTIVITY EARTH IMAGER - An imaging tool made includes a pad whose curvature is chosen based on the expected range of borehole radius and the pad size so as to maintain the maximum standoff below a desired value. The curvature may be adjusted using fasteners. | 11-29-2012 |
20130002257 | Method For Improving Wellbore Survey Accuracy And Placement - Methods for improving wellbore survey accuracy and placement are disclosed. The Earth's magnetic field may be measured at a magnetically clean surface location and correlated with a non-magnetic reference direction to obtain a direction of the Earth's field (e.g., a magnetic declination or a magnetic inclination). The direction of the Earth's magnetic field may in turn be processed in combination with magnetic measurements made in a subterranean borehole to obtain one or more survey parameters. | 01-03-2013 |
20130057287 | Method and Apparatus for Well-Bore Proximity Measurement While Drilling - An apparatus for determining a distance between a first borehole and a second borehole is provided that in one embodiment includes a rotating magnet on a tool configured for placement in the second borehole for inducing magnetization in a magnetic object in the first borehole, a first coil and a second coil placed radially symmetrically with respect to an axis of the tool, the first coil providing a first signal and second coil providing a second signal responsive to a magnetic flux resulting from the magnetization in the magnetic object in the first borehole, and a controller configured to combine the first signal and the second signal and determining distance between the first borehole and the second borehole using the combined signal. | 03-07-2013 |
20130069655 | AT-BIT MAGNETIC RANGING AND SURVEYING - A bottom hole assembly configured for a subterranean drilling operation having a drill bit; a downhole tool deployed above the drill bit, at least a portion of the downhole tool free to rotate with respect to the drill bit about a longitudinal axis of the bottom hole assembly a sensor sub deployed axially between the drill bit and the downhole tool, the sensor sub configured to rotate with the drill bit about the longitudinal axis of the bottom hole assembly and free to rotate with respect to the downhole tool about the longitudinal axis and a tri-axial magnetic field sensor deployed in the sensor sub. | 03-21-2013 |
20130113491 | DRILLING DYNAMICS MONITOR - Procedures are described for monitoring dynamics along a drill string during the drilling process using only surface instrumentation or using a combination of surface and downhole instrumentation. Events such as drill collar whirl may be identified from signatures found in signals generated by an electromagnetic sensor such as a magnetometer and/or from a mechanical sensor such as accelerometer. Additional embodiments are described. | 05-09-2013 |
20130119995 | Rugged Three-Axis Inclinometer - A method and apparatus for a rugged three-axis inclinometer for determining an object's orientation with respect to a gravitational field. Components of the apparatus include but not limited to a magnet, a non-magnetic casing, a ferrofluid, one or more non-magnetic gravitational field aligning materials attached to the magnet and a plurality of angle sensors attached to the non-magnetic casing. In this regard, when the apparatus is rotated, the gravitational field aligning materials maintain a constant orientation of the magnet and the angle sensors experience different magnetic field strengths as they rotate around the magnet. The position of the apparatus, with respect to the gravitational field can then be calculated based on the angle sensor outputs. | 05-16-2013 |
20130181719 | DOWNHOLE ACTIVATION SYSTEM USING MAGNETS AND METHOD THEREOF - A downhole activation system within a tubular. The system includes an axially movable mover. A first magnet attached to the mover. The first magnet axially movable with the mover. A second magnet separated from the first magnet. The second magnet magnetically repulsed by the first magnet. A biasing device urging the second magnet towards the first magnet; wherein movement of the first magnet via the mover towards the second magnet moves the second magnet in a direction against the biasing device. Also included is a method of activating an activatable member in a downhole tubular. | 07-18-2013 |
20130314092 | Sensing The Magnetic Field of The Earth - A magnetometer includes a sensor housing having an internal bore formed therethrough and a magnetic field sensor disposed within the internal bore of the sensor housing. The magnetic field sensor is fixedly mounted within the internal bore of the sensor housing. A magnetic flux concentrating block is disposed proximate to an end of the at least one magnetic field sensor. An electronics unit is disposed within the internal bore of the sensor housing and is operatively and communicatively connected to the magnetic field sensor. The electronics unit is configured to receive a signal from the magnetic field sensor. | 11-28-2013 |
20130342210 | DOWNHOLE ALL-OPTICAL MAGNETOMETER SENSOR - Various systems and methods for implementing and using a downhole all-optical magnetometer include downhole all-optical magnetometer sensor, including optical receiving ports that receive light pulses, a depolarizer that depolarizes received light pulses, and a polarizer that polarizes depolarized light pulses from the depolarizer. The sensor further includes a vapor-filled cell through which polarized light pulses from the polarizer are directed, wherein interactions between vapor and a magnetic field within the vapor-filled cell alter at least some of the polarized light pulses, and an optical transmitting port that directs altered light pulses from the vapor-filled cell out of the sensor. | 12-26-2013 |
20140111210 | Apparatus and Methods for Well-Bore Proximity Measurement While Drilling - In one aspect an apparatus for determining a distance between a first borehole and a second borehole during drilling of the second borehole is disclosed that in one embodiment includes a magnet on a drilling tool that rotates in the second borehole to induce a primary magnetic field in a magnetic object in the first borehole, a substantially stationary sensor on the drilling tool that detects a secondary magnetic field from the magnetic object responsive to the induced primary magnetic field, and a controller that determines the distance between the first borehole and the second borehole from the detected magnetic field. In another aspect a method of determining a distance between a first borehole and a second borehole, the in one embodiment includes inducing a primary magnetic field in a magnetic object in the first borehole using a rotating magnet in the second borehole, detecting a secondary magnetic field from the magnetic object responsive to the induced primary magnetic field using a substantially stationary sensor in the second borehole, and determining the distance between the first borehole and the second borehole from the detected magnetic field. | 04-24-2014 |
20140111211 | Method For Guiding A Downhole Tool Assembly Using An Above-Ground Receiver System - A method and receiver system for identifying a location of a magnetic field source using two horizontally displaced tri-axial antennas. In a preferred embodiment two tri-axial antennas are positioned at opposite ends of a receiver frame. Each antenna detects in three dimensions a magnetic field from a source or transmitter. The receiver is maintained in a horizontal plane and the receiver is moved in the horizontal plane until a flux angle measured at each of the two points is zero so that the receiver is in the vertical plane perpendicular to the axis of the source. The depth and location of the source in three dimensions relative to the receiver is determined using the detected field values. The receiver is moved in a direction defined by a line containing the two points of the receiver until a magnitude of the magnetic field detected at each of the two points is substantially the same so that the receiver is positioned above the source. | 04-24-2014 |
20140333310 | ANGULAR POSITION SENSOR WITH MAGNETOMETER - An angular position sensor can include a magnetic device from which a magnetic field emanates, and multiple magnetometers, whereby each magnetometer senses a varying strength of the magnetic field due to relative rotation between components of a well tool. A method of determining an azimuthal position of a shaft which rotates relative to an outer housing can include securing a selected one of at least one magnetic device and at least one magnetometer to the shaft, securing the other of the magnetic device and the magnetometer to the outer housing, a fluid motor rotating the shaft relative to the outer housing in the well, and the magnetometer sensing a varying strength of a magnetic field emanating from the magnetic device as the shaft rotates relative to the housing. | 11-13-2014 |
20140340089 | MAGNETIC SENSING APPARATUS, SYSTEMS, AND METHODS - In some embodiments, an apparatus and a system, as well as a method and an article, may operate to acquire a first signal from a first magnetometer at least partially disposed within a Helmholtz coil, to acquire a second signal from a second magnetometer having a sensitivity at least one thousand times less than the first magnetometer, to process the second signal to determine a N drive signal, to drive the Helmholtz coil using the drive signal so as to null an ambient Earth magnetic field surrounding the first magnetometer, and to process the first signal as one of a down hole location signal or a down hole telemetry signal, the location signal to determine a range to a sub-surface object, and the telemetry signal to provide data from down hole drilling operations. Additional apparatus, systems, and methods are disclosed. | 11-20-2014 |
20150054513 | METHODS AND DEVICES FOR EXTRA-DEEP AZIMUTHAL RESISTIVITY MEASUREMENTS - An apparatus for estimating at least one parameter of interest of an earth formation includes a first sub and a second sub positioned along the conveyance device. The first sub and the second sub cooperate to generate at least one main component measurement and only the second sub is configured to generate at least one cross-component measurement. A method includes conveying a first sub and a second sub along a wellbore formed in the earth formation using a conveyance device, using the first sub and the second sub to generate at least one main component measurement, and using only the second sub to generate at least one cross-component measurement. | 02-26-2015 |
20150331138 | Real-Time, Limited Orientation Sensor Auto-Calibration - A system method and computer-readable medium for correcting measurements obtained by a down hole tool for residual measurement errors is disclosed. A down hole tool having at least two directional field sensors is disposed in a borehole. The at least two directional sensors are substantially orthogonal to each other and to a longitudinal axis of the down hole tool. Measurements are obtained from the at least two directional sensors during rotation of the tool by at least 360 degrees around the longitudinal axis of the tool. Residual measurement errors are determined for the obtained measurements, and a quality level of the determined residual measurement errors selected. The determined residual measurement errors are applied to the obtained measurements when the determined residual measurement errors are consistent with the selected quality level. In various embodiments, the residual measurement errors are reduced from a first value that does not match the selected quality level to a second value that are consistent with the selected quality level. | 11-19-2015 |
20150345285 | EXPLOSION-PROOF MAGNETIC FLUX LEAKAGE INSPECTION APPARATUS FOR WELL TUBING - Explosion-proof magnetic flux leakage inspection apparatus for well tubing includes a hermetically sealed interior chamber with an inner wall assembly that forms and surrounds a central channel in a manner that separates the central channel from the hermetically sealed interior chamber by the inner wall assembly. The central channel has an open top and an open bottom to accommodate passage of the well tubing through the central channel. An electromagnetic coil, magnetic flux leakage detector assembly, and a shallow reading detector assembly are positioned in the hermetically sealed interior chamber around the inner wall assembly. | 12-03-2015 |
20160032712 | Magnetic Location Determination in a Wellbore - A magnetic system for determining the location of a wellbore component in a first string relative to a wellbore component in a second string. The system includes a circumferentially distributed array of magnets positioned in the first string that is operable to produce a magnetic field in the wellbore proximate the location of the array of magnets. A magnetic field detector is operably associated with the second string and is operable to detect a magnetic signature of the magnetic field. One of the first and second strings is stationary within the wellbore. The other of the first and second strings is moveable in the wellbore such that the magnetic field detector is moveable relative to the magnetic field and such that when the magnetic field detector identifies the magnetic signature, the location of the array of magnets is correlated with the magnetic field detector. | 02-04-2016 |
20160041233 | LOW-NOISE FLUXGATE MAGNETOMETER WITH INCREASED OPERATING TEMPERATURE RANGE - In some embodiments, an apparatus and a system, as well as a method and an article, may include synchronic symmetrical integrator circuitry and a magnetic field measurement device comprising an excitation circuit including an excitation coil, the excitation coil being wound around an amorphous soft magnetic core having a certain temperature coefficient such that inductance of the excitation circuit will change with temperature variations of the amorphous soft magnetic core; a detection circuit including a detection coil, the detection coil being wound around the same amorphous soft magnetic core, such that inductance variation of the detection circuit with temperature of the core can be detected from the excitation coil; and a resonation control circuit coupled to the excitation circuit and to the detection circuit to adjust a resonant frequency of the detection circuit responsive to temperature variations of the core. Additional apparatus, systems, and methods are disclosed. | 02-11-2016 |
20160041296 | RANGING MEASUREMENT APPARATUS, METHODS, AND SYSTEMS - Disclosed embodiments include well ranging apparatus, systems, and methods which operate to detect and determine a relative distance and/or azimuthal direction of nearby target well conductors such as pipes, well casing, etc., from within a borehole of a drilling well. | 02-11-2016 |
20160091626 | System and Methodology for Orientation of A Borehole Seismic Source - A technique generates seismic data that may be analyzed. A combination sensor is operated and deployed in a borehole to obtain orientation data, such as data related to the local magnetic field and a log of the magnetic field direction in the borehole. Following the combination sensor, at least one multi-component seismic source is deployed downhole into the borehole. The at least one multi-component seismic source comprises sensors, such as an inclinometer and a magnetometer. Data from the combination sensor and from the at least one multi-component seismic source is processed to determine an absolute orientation of the at least one multi-component seismic source. | 03-31-2016 |
20160097272 | WELL COMPLETION WITH SINGLE WIRE GUIDANCE SYSTEM - The present disclosure includes a system. The system includes a current source and a ground terminal The ground terminal is electrically connected to the current source. The ground terminal is grounded at the surface of the Earth. The system further includes a reference conductor. The reference conductor is electrically connected to the current source, and the reference conductor is inserted into a reference wellbore. The system further includes a tubular. The tubular includes a tubular string electrical discontinuity, and the tubular is inserted into the reference wellbore. The tubular has a tubular bottom hole end, and the tubular is electrically conductive between the electrical discontinuity and the bottom hole end. The system further includes an electrical connection between the tubular and reference conductor between the tubular string electrical discontinuity and the tubular bottom hole end. The system also includes an electrical connection between the tubular and the reference wellbore between the tubular string electrical discontinuity and the tubular bottom hole end. The system further includes magnetic sensors located outside the reference wellbore. | 04-07-2016 |
20160103240 | WELL RANGING APPARATUS, METHODS, AND SYSTEMS - Apparatus, systems, and methods may operate to couple a power supply to a ground point associated with a well, and to a lower portion of a conductive casing disposed within the well, where the lower portion of the conductive casing is separated by an insulating gap from an upper portion of the conductive casing, the upper portion of the conductive casing being at a higher elevation of the first well than the lower portion of the conductive casing. Further activity may include injecting an excitation signal into the lower portion of the conductive casing to induce a magnetic field in a geological formation surrounding the first well. Additional apparatus, systems, and methods are disclosed. | 04-14-2016 |
20160115779 | Active Magnetic Azimuthal Toolface for Vertical Borehole Kickoff in Magnetically Perturbed Environments - An artificial toolface reference system includes a power supply providing current to a ground lead and a reference lead. A ground point is coupled to the ground lead and in electrical connection with the ground. A reference wellbore includes a reference conductor in electrical connection with the ground. The reference conductor is in electrical connection with the reference lead. A guidance sensor positioned outside the reference wellbore includes at least one magnetometer. The power supply may be used to provide a current through the reference conductor, the ground, and the ground point such that a reference magnetic field is generated along the reference conductor. The guidance sensor may measure the reference magnetic field with a magnetometer. An artificial magnetic toolface may be calculated therefrom. | 04-28-2016 |
20160116623 | RANGING MEASUREMENTS USING MODULATED SIGNALS - A method for performing ranging measurements within a formation includes transmitting an asymmetric time-varying signal from a transmitter ( | 04-28-2016 |
20160139290 | FIBER OPTIC BASED MAGNETIC SENSING APPARATUS, SYSTEMS, AND METHODS - In some embodiments, an apparatus and a system, as well as a method and an article, may operate to acquire a monitoring output from a first distributed feedback (DFB) fiber laser sensor at least partially bonded to a piezoelectric portion of a downhole device, to demodulate the monitoring output to determine a frequency shift in a lasing frequency of the DFB fiber laser sensor, and to correlate the frequency shift to a measure of magnetic field strength to determine a strength of a downhole magnetic field. Additional apparatus, systems, and methods are disclosed. | 05-19-2016 |
20160161626 | Method To Predict Local Geomagnetic Disturbance Field And Its Practical Application - A method for correcting geomagnetic reference field includes measuring Earth magnetic field elements at least one F G known geodetic position. Earth magnetic field elements are measured at a position proximate the location. A disturbance function is determined from the Earth magnetic field measurements made at the at least one known geodetic position. A magnetic disturbance field measurement transfer function is estimated between the at the at least one known geodetic and proximate positions to estimate a disturbance function at the proximate position. The estimated magnetic disturbance function is used to correct geomagnetic reference field or measurements made at the location. | 06-09-2016 |