| Patent application number | Description | Published |
|---|
| 20080215243 | Processing of Multi-Component Induction Measurements in a Biaxially Anisotropic Formation - Measurements made by a multi-component logging tool in a borehole are inverted to obtain three principal resistivities (or conductivities) and three associated angles of a bi-axially symmetric formation traversed by the borehole. | 09-04-2008 |
| 20080231283 | Multi-Frequency Cancellation of Dielectric Effect - Measurements made with an induction logging tool are responsive to formation conductivity and permittivity. The effect of permittivity can be substantially removed by multifrequency focusing. | 09-25-2008 |
| 20080247270 | Resistivity Measurement Through Metal Casing Using Magnetic Field and Magnetoacoustic Phenomena - Measurements of acoustic velocities are made through a case borehole in the absence and presence of an applied magnetic field. A formation resistivity parameter may be estimated from differences in the acoustic velocities. | 10-09-2008 |
| 20080270032 | Induction Tool for Detail Evaluation of Near Borehole Zone - Measurements made with an induction logging tool are processed to provide a resistivity model of fluid invasion of the formation. Up to five zones can be determined over a radial distance of about 0.6 m. 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 understanding that it will not be used to interpret or limit the scope or meaning of the claims. | 10-30-2008 |
| 20090018775 | Geosteering in Earth Formations Using Multicomponent Induction Measurements - A multicomponent induction logging tool is used on a MWD bottomhole assembly. Multifrequency focusing that accounts for the finite, nonzero, conductivity of the mandrel is applied. Using separation of modes, the principal components and a direction of a conductivity tensor are determined. The results are used for reservoir navigation in earth formations. 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 understanding that it will not be used to interpret or limit the scope or meaning of the claims. 37 CFR 1.72(b) | 01-15-2009 |
| 20100109672 | Transient EM for Geosteering and LWD/Wireline Formation Evaluation - A transmitter on an instrument is used to induce currents in an earth formation when it is turned on or off. A Fourier transform is applied to transient measurements made in the receivers. A multifrequency focusing of the transformed data is used for applications like determination of a distance to an interface in the formation, controlling the drilling direction, determination of formation resistivities and formation strike directions. | 05-06-2010 |
| 20100172211 | Resistivity Measurement Through Metal Casing Using Magnetic Field and Magnetoacoustic Phenomena - Measurements of acoustic velocities are made through a case borehole in the absence and presence of an applied magnetic field. A formation resistivity parameter may be estimated from differences in the acoustic velocities. | 07-08-2010 |
| 20100179762 | Method of Correcting Imaging Data For Standoff and Borehole Rugosity - An apparatus having transmitter and receiver antennas is provided for measuring conductivity of an earth formation surrounding a borehole. The apparatus utilizes an initial model to invert induction measurements of the earth formation to provide a conductivity model that includes a plurality of coaxial cylinders. | 07-15-2010 |
| 20100213943 | METHOD FOR ACCENTUATING SIGNAL FROM AHEAD OF THE BIT - A method for estimating a property of a portion of an earth formation ahead of a borehole penetrating the formation, the method includes: conveying a logging tool through the borehole; receiving one or more first signals from a previous depth of the logging tool; constructing a model of the earth formation using the one or more first signals; predicting one or more second signals from the portion of the earth formation ahead of the borehole using the model; receiving one or more third signals from the portion of the earth formation ahead of the borehole; calculating a difference between the one or more third signals and the one or more second signals; and estimating the property from the difference. | 08-26-2010 |
| 20100225323 | Collocated Tri-Axial Induction Sensors With Segmented Horizontal Coils - A logging tool for use in a borehole to obtain multicomponent resistivity induction measurements using collocated coils wherein each of the transverse antennas comprises a pair of mirror-image coils symmetrically disposed about an axis of the logging tool. | 09-09-2010 |
