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| Number | Title | Issue Date |
| 8183863 | Displaced electrode amplifier A displaced electrode amplifier (“DEA”) for measuring signals from high impedance sources. The amplifier may include an operational amplifier (“op-amp”) configured as a unity gain buffer, with a feedback path to the non-inverting input to at least partly com... | 05/22/2012 |
| 8139958 | Frequency-domain equalization of the fiber optic channel Systems and methods for frequency-domain compensation in optical communication systems. In pre-equalization embodiments, the transmitter transforms the data stream into a frequency domain signal and applies a compensation filter before transforming it back into a pr... | 03/20/2012 |
| 8136609 | Multiple input scaling autodriller A wellbore drilling system includes a weight on bit controller configured to generate a normalized weight on bit output, a drilling torque controller configured to generate a normalized toque on bit output, and a differential pressure controller configured to genera... | 03/20/2012 |
| 8125848 | Acoustic logging-while-drilling tools having a hexapole source configuration and associated logging methods Multipole acoustic logging-while-drilling (LWD) tools and associated methods are disclosed herein. In some embodiments, the disclosed acoustic LWD tool comprises a transmitter array and at least one receiver array. The transmitter array generates acoustic waves with... | 02/28/2012 |
| 8116168 | Hybrid one-way and full-way wave equation migration A migration method using hybrid one-way and full-way (HOF) wave equation propagation. The HOF method extrapolates seismic wavefields in less complex media with a one-way wave equation propagator and extrapolates seismic wavefields in extremely complex media with a f... | 02/14/2012 |
| 8085050 | Robust inversion systems and methods for azimuthally sensitive resistivity logging tools Methods and systems for determining the horizontal resistivity, vertical resistivity, and relative dip angle of anisotropic earth formations. Some of the disclosed methods and systems measure sinusoidal variation of azimuthally sensitive resistivity logging tool mea... | 12/27/2011 |
| 8085049 | Electromagnetic wave resistivity tool having a tilted antenna for geosteering within a desired payzone This invention is directed to a downhole method and apparatus for simultaneously determining the horizontal resistivity, vertical resistivity, and relative dip angle for anisotropic earth formations. The present invention accomplishes this objective by using an ante... | 12/27/2011 |
| 8030937 | Multiple frequency based leakage correction for imaging in oil based muds Oil-based mud imaging systems and methods having leakage current compensation. In some embodiments, disclosed logging systems include a logging tool in communication with surface computing facilities. The logging tool is provided with a sensor array having at least ... | 10/04/2011 |
| 8016053 | Drill bit configurations for parked-bit or through-the-bit-logging Disclosed drilling systems offer multiple methods providing access to the open borehole without first tripping the drill string. In some embodiments, a drill bit has a tool port that is blocked by a plug during normal drilling operations. When a tool is deployed thr... | 09/13/2011 |
| 7982464 | Drilling systems and methods using radial current flow for boundary detection or boundary distance estimation Systems and methods for look-ahead boundary detection and distance estimation are disclosed. In some embodiments, a drilling method includes extending a borehole with a drill string that includes a resistivity logging tool. The logging tool makes upward-looking and ... | 07/19/2011 |
| 7948238 | Electromagnetic wave resistivity tool having a tilted antenna for determining properties of earth formations This invention is directed to a downhole method and apparatus for simultaneously determining the horizontal resistivity, vertical resistivity, and relative dip angle for anisotropic earth formations. The present invention accomplishes this objective by using an ante... | 05/24/2011 |
| 7888941 | Permittivity measurements with oil-based mud imaging tool Oil-based mud imaging systems and methods that measure formation permittivity. In some embodiments, disclosed logging systems include a logging tool in communication with surface computing facilities. The logging tool is provided with a sensor array having at least ... | 02/15/2011 |
| 7886099 | Systems and methods for providing a personal computer with non-volatile system memory In some embodiments, a system comprises a system memory module and an access card. The system memory module connects to a memory bus on a motherboard for a personal computer, while the access card connects to an expansion bus. The access card couples to the system m... | 02/08/2011 |
| 7800513 | High performance communication system A system for communicating information in a borehole between tool assemblies in a tool string includes receiving an information signal and separating a first signal that may be a power and low speed signal. A second signal is separated and demodulated from the infor... | 09/21/2010 |
| 7696756 | Oil based mud imaging tool with common mode voltage compensation An apparatus and method for minimizing the effects of a common mode voltage signal in downhole logging tools utilized to determine the resistivity of an adjacent portion of a borehole wall. Two current electrodes are energized by an excitation source to create an os... | 04/13/2010 |
| 7675814 | Method and apparatus for generating acoustic signals with a single mode of propagation A method and apparatus for generating an acoustic signal having a single mode of propagation along borehole walls. The method includes generating an n-pole (monopole, dipole, quadrupole, and so on) acoustic signal and calculating the tool position and borehole shape... | 03/09/2010 |
| 7659722 | Method for azimuthal resistivity measurement and bed boundary detection Systems and methods for performing bed boundary detection and azimuthal resistivity logging with a single tool are disclosed. Some method embodiments include logging a borehole with an azimuthally-sensitive resistivity logging tool; deriving both a resistivity log a... | 02/09/2010 |
| 7557580 | Electromagnetic wave resistivity tool having a tilted antenna for geosteering within a desired payzone This invention is directed to a downhole method and apparatus for simultaneously determining the horizontal resistivity, vertical resistivity, and relative dip angle for anisotropic earth formations. The present invention accomplishes this objective by using an ante... | 07/07/2009 |
| 7557579 | Electromagnetic wave resistivity tool having a tilted antenna for determining the horizontal and vertical resistivities and relative dip angle in anisotropic earth formations This invention is directed to a downhole method and apparatus for simultaneously determining the horizontal resistivity, vertical resistivity, and relative dip angle for anisotropic earth formations. The present invention accomplishes this objective by using an ante... | 07/07/2009 |
| 7443312 | Downhole telemetry system having discrete multi-tone modulation with QAM fallback Improved communication systems and methods are disclosed. In one embodiment, a downhole communications system comprises a downhole transceiver and a surface transceiver. The surface transceiver receives a discrete multi-tone (DMT) modulated uplink signal from the do... | 10/28/2008 |
| 7442932 | High temperature imaging device High temperature imaging devices are disclosed. In one embodiment, the imaging device comprises an array of photosensitive elements fabricated on an insulator substrate, and an information storage component coupled to the array. The information storage component sto... | 10/28/2008 |
| 7391723 | Frame-level fibre channel CRC on switching platform A method and apparatus is presented for performing a sequence-level CRC calculation on fiber channel communications within a switching platform domain. A CRC generator searches the data communication for frames that contain the type of data for which a sequence-leve... | 06/24/2008 |
| 7324010 | Acoustic telemetry systems and methods with surface noise cancellation Acoustic telemetry systems and methods with surface noise cancellation. One illustrative embodiment may include an acoustic telemetry system comprising a transmitter configured to generate an acoustic information signal that propagates along a drillstring, and a rec... | 01/29/2008 |
| 7301223 | High temperature electronic devices In at least some embodiments, electronic devices suitable for use at temperatures in excess of 200 C. may comprise an integrated circuit fabricated on a silicon carbide substrate, and a thick passivation layer. In other embodiments, electronic devices suitable for u... | 11/27/2007 |
| 7280987 | Genetic algorithm based selection of neural network ensemble for processing well logging data A system and method for generating a neural network ensemble. Conventional algorithms are used to train a number of neural networks having error diversity, for example by having a different number of hidden nodes in each network. A genetic algorithm having a multi-o... | 10/09/2007 |
| 7269514 | System and method for correcting induction logging device measurements by alternately estimating geometry and conductivity parameters A method and related system for correcting measurements obtained from an induction logging device. In one embodiment, the method comprises: receiving conductivity measurements from a multi-array induction tool; constructing a measurement pattern vector from the cond... | 09/11/2007 |
| 7265682 | Joint source-channel coding for multicarrier modulation Methods and systems employing combined source-channel coding for multi-carrier modulation (MCM). In some embodiments, a described method comprises: estimating channel gain to noise ratio (CGNR) as a function of frequency bin; determining MCM parameters that minimize... | 09/04/2007 |
| 7265552 | Electromagnetic wave resistivity tool having a tilted antenna for geosteering within a desired payzone This invention is directed to a downhole method and apparatus for simultaneously determining the horizontal resistivity, vertical resistivity, and relative dip angle for anisotropic earth formations. The present invention accomplishes this objective by using an ante... | 09/04/2007 |
| 7239098 | Digital adaptive sensorless commutational drive controller for a brushless DC motor Various embodiments of an electrical motor, a brushless DC motor controller, and applications thereof. In one embodiment, a fluid-moving device is provided with a brushless DC motor and a motor controller. The controller may include a set of comparators and a clocke... | 07/03/2007 |
