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Match Document Document Title
9043153 Maximum depth of investigation of measurements in a formation  
The present disclosure relates to a method to determine a volume of clearance surrounding a wellbore. A logging tool is provided. The logging tool may be disposed on a wireline, a drill string, or...
9037415 OBM resistivity image enhancement using principal component analysis with first moment estimation  
Method and apparatus for estimating a resistivity property of an earth formation in a borehole with oil-based drilling fluid. The method may include estimating the resistivity property using a...
9008970 Compensated crosswell tomography methods and systems  
A method and system to compensate for inaccuracies in crosswell tomography is presented. The method includes obtaining data from at least two receivers in response to transmissions from at least...
9008986 Variable tool calibration  
The present disclosure relates to a method to calibrate logging measurements from a logging tool for which one or more attributes vary over the course of logging. A logging tool is provided and a...
9002649 Efficient inversion systems and methods for directionally-sensitive resistivity logging tools  
Various resistivity logging tools, systems, and methods are disclosed. At least some tool embodiments include transmit and receive antennas that measure the electromagnetic response of the...
9002648 Method and apparatus for precise positioning of a borehole measurement instrument  
A system and method for use in a downhole tool having distance measurement, feature detection, and primary measurement devices positioned therein are provided. In one example, the method includes...
8972193 Formation resistivity imager with reduced leakage to mandrel  
A method of estimating a parameter of a formation contacting a borehole with an instrument that includes a mandrel and a pad includes providing a measurement voltage to the pad; applying a biasing...
8960326 Formation dip geo-steering method  
A geo-steering method for drilling a formation penetrated by multiple wells. The method comprises computing a stratigraphic target formation window, computing a target line utilizing an...
8965702 Formation resistivity measurements using multiple controlled modes  
Disclosed is an apparatus for estimating a property of an earth formation penetrated by a borehole. The apparatus includes a plurality of electrodes disposed downhole and configured to inject an...
8958922 System and method for optimized decision-making in water supply networks and/or water supply operations  
A system and method are provided for optimized decision-making in water supply networks and/or water supply operations. The system includes at least one central data processing device and a...
8954280 Methods and systems for determining formation parameters using a rotating tool equipped with tilted antenna loops  
Methods and systems for characterizing a formation are disclosed. A tool is placed in the formation. The tool comprises a perpendicular antenna set and a parallel antenna set. The perpendicular...
8942925 Determination of complex dielectric constants from electromagnetic propagation measurements  
A method of determining the dielectric constant of a formation, comprising acquiring phase-related and amplitude-related measurements for electromagnetic signals propagating though the formation...
8942941 Current-to-voltage converters with dynamic feedback  
An apparatus for modifying an output signal indicative of a downhole parameter that may include a carrier conveyable in a wellbore; a negative error compensator; and an output signal device. The...
8917094 Method and apparatus for detecting deep conductive pipe  
Downhole tools and techniques acquire information regarding nearby conductors such as pipes, well casing, and conductive formations. At least some method embodiments provide a current flow along a...
8901931 Electromagnetic surface-to-borehole look around systems and methods of monitoring in horizontal wells  
A method for water monitoring about a deviated well is disclosed. The method includes positioning a series of electromagnetic (EM) receivers in a completed deviated wellbore, said receivers being...
8892362 System and method for improving surface electromagnetic surveys  
A technique provides a methodology for improving surveys of subterranean regions. The methodology comprises estimating macro anisotropy and an intrinsic or micro anisotropy of an overburden. A...
8886463 Characterizing an earth subterranean structure by iteratively performing inversion based on a function  
To characterize an earth subterranean structure using a measurement assembly including electromagnetic (EM) receivers and one or more EM sources, measured voltage data collected by EM receivers in...
8862406 Electrical imager operating in oil-based mud and low resistive formation  
This disclosure relates to apparatuses and methods for reducing current leakage between a measure electrode and a logging tool body during borehole investigations in an earth formation involving...
8862405 System and method for producing look-ahead profile measurements in a drilling operation  
A method and system for producing look-ahead profiles measurements includes positioning an energy transmitter, such as a transmitting antenna, proximate to a borehole assembly tool. One or more...
8849572 Apparatus for determining the concentration of a conductive fluid present in a fluid filled borehole  
An apparatus for determining the concentration of a conductive fluid present in a fluid filled bore hole is described. Such apparatus are known as water hold-up meters and are frequently used in...
8838389 Polar display for use with drilling tools  
Various techniques for generating a polar display include a method, which involves receiving information identifying a formation property of an anomaly within a geologic formation from a...
8829907 Frequency filtering and adjustment of electromagnetically received signals from antennas  
An apparatus for estimating a property of an earth formation penetrated by a borehole, the apparatus having: a carrier configured to be conveyed through the borehole; a transmitter disposed at the...
8816689 Apparatus and method for multi-component wellbore electric field Measurements using capacitive sensors  
A method and apparatus is provided for collecting reservoir data. The method includes providing one or more electromagnetic sources for generating an electromagnetic field in a reservoir and...
8812237 Deep-reading electromagnetic data acquisition method  
A method of measuring a parameter characteristic of a rock formation is provided, the method including the steps of obtaining crosswell electromagnetic signals between two wells and using an...
8812282 Efficient method for inversion of geophysical data  
A method for efficient inversion of measured geophysical data from a subsurface region to prospect for hydrocarbons. Gathers of measured data (40) are encoded (60) using a set of non-equivalent...
8803527 Use of electrodes and multi-frequency focusing to correct eccentricity and misalignment effects on transversal induction measurements  
A multicomponent induction logging tool uses a nonconducting mandrel. A central conducting member including wires that electrically connect at least one of the antennas to another of the antennas....
8786288 Concentric buttons of different sizes for imaging and standoff correction  
Disclosed is a method of estimating a property of an earth formation penetrated by a borehole. The method includes conveying a carrier through the borehole and performing a plurality of electrical...
8788208 Method to estimate pore pressure uncertainty from trendline variations  
Disclosed is a method for estimating a pore pressure of an earth formation penetrated by a borehole and an associated uncertainty. The method includes: conveying a carrier through the borehole;...
8781744 Downhole surveying utilizing multiple measurements  
Certain embodiments described herein provide an estimate of the magnetic interference incident upon a drilling system using multiple magneticclaim sensors within a downhole portion of the drilling...
8775084 Adaptive borehole corrections accounting for eccentricity for array laterologs  
Disclosed is an adaptive borehole correction (ABC) technique based on an inversion approach that advantageously corrects shallow laterolog measurements for borehole effects, including determining...
8762107 Triaxial induction calibration without prior knowledge of the calibration area's ground conductivity  
Disclosed is a method for determining calibration factors of an induction tool that includes three receiver coils, each having a distinct orientation. The method includes: placing the induction...
8756016 Method and system to estimate fracture aperture in horizontal wells  
A method for estimating a fracture aperture in a formation penetrated by a well includes obtaining at least one of a vertical resistivity (Rv) and a horizontal resistivity (Rh) of the formation;...
8756015 Processing of azimuthal resistivity data in a resistivity gradient  
A method for increasing sensitivity in a measurement of at least one of magnitude and direction of resistivity in a subsurface material, the method including: performing a first set of...
8756017 Method for detecting formation resistivity outside of metal casing using time-domain electromagnetic pulse in well  
A method for detecting formation resistivity outside of metal casing using time-domain electromagnetic pulse in a borehole, the method including steps of a) providing a borehole large power pulse...
8756018 Method for time lapsed reservoir monitoring using azimuthally sensitive resistivity measurements while drilling  
A method for determining movement of a fluid contact in a subsurface reservoir includes measuring azimuthally sensitive resistivity at a first time from within a wellbore penetrating the...
8733432 System and method for electrical resistivity tomography and/or electrical impedance tomography  
In electrical resistivity tomography and electrical impedance tomography, interference effects of the metal well casing can be reduced by disposing measurement electrodes in the form of conductive...
8718942 Systems and methods for investigating a formation surrounding a borehole  
A method, a system, and an apparatus are described for the data acquisition in the well-logging of a borehole wall during the investigation of formation properties. Data acquisition is conducted...
8694259 Simultaneous inversion of induction data for dielectric permittivity and electric conductivity  
A method of inverting induction logging data for evaluating the properties of underground formations surrounding a borehole, the data including induction voltage measurements obtained from a tool...
8694258 Derivative imaging for subsurface object detection  
A series of scans is generated for a subsurface and a derivative image is created using the series of subsurface images. One or more tests are performed on the derivative image, and a subsurface...
8626446 Method of directional resistivity logging  
A method for estimating at least one formation parameter from a directional resistivity measurement includes computing a plurality of hypothetical directional resistivity values at a corresponding...
8614577 Automatic anisotropy, azimuth and dip determination from upscaled image log data  
A method of determining anisotropy in a borehole is disclosed. An array of measurements along the borehole is obtained and a first depth in the borehole is selected. An arbitrary plane oriented...
8612194 Updating a subterranean model using at least electromagnetic data  
To update a subterranean model, an initial subterranean model is provided, and based on the initial subterranean model, changes to subterranean parameters are predicted using a reservoir...
8589078 Guided Bayesian experimental design  
A Bayesian methodology is described for designing experiments or surveys that are improved by utilizing available prior information to guide the design toward maximally reducing posterior...
8589079 Method and system for passive electroseismic surveying  
A method of passive surveying comprises generating one or more detected signals by passively detecting a signal generated within a subsurface earth formation due to a seismoelectric response or an...
8570044 Providing measurements to enable determination of electrical resistivity anisotropy of a subterranean structure  
To analyze content of a subterranean structure, electric field measurements at plural source-receiver azimuths in a predefined range are received. Total magnetic field measurements are also...
8571797 Determining borehole corrected formation on properties  
A method to determine one or more borehole corrected formation properties using measurements made using a logging tool disposed in a borehole penetrating an earth formation is disclosed. The...
8566036 Method and system for passive electroseismic surveying  
A method of passive surveying comprises generating one or more detected signals by passively detecting a signal generated within a subsurface earth formation due to a seismoelectric response or an...
8566037 Method and system for passive electroseismic surveying  
A method of passive surveying comprises generating one or more detected signals by passively detecting a signal generated within a subsurface earth formation due to a seismoelectric response or an...
8554482 Monitoring reservoirs using array based controlled source electromagnetic methods  
Electrical property contrast difference maps of the subsurface formations may be produced using surface and/or near surface array of transmitters and receivers tuned to emit and receive...
8554483 Methods and apparatus to process measurements associated with drilling operations  
Methods and apparatus to process measurements associated with drilling operations are described. An example method of modifying processing results during a subterranean formation drilling...

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