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| Number | Title | Issue Date |
| 8190368 | Method of finite-element discretization in heterogeneous and highly conductive grid cells A method for simulating a conductivity measured by a resistivity tool disposed in a borehole penetrating a formation, the method including: constructing a main grid extending from the borehole into the formation; constructing an auxiliary grid that is local to the m... | 05/29/2012 |
| 8185313 | Classifying potential hydrocarbon reservoirs using electromagnetic survey information A probabilistic method for classifying observed CSEM response for a resistive anomaly to classify the response into multiple geologic categories indicative of hydrocarbon production potential. Each category is assigned a prior probability (301). For each cate... | 05/22/2012 |
| 8185312 | Downhole surveying utilizing multiple measurements Systems and methods for controlling a drill string are provided. A method comprises receiving one or more first signals from a first sensor package mounted in a first portion of the drill string at a first position within a wellbore. The first signals may be indicat... | 05/22/2012 |
| 8135542 | 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 placed close to the formations of interest, the method includes: (a) d... | 03/13/2012 |
| 8126647 | Lithofacies classification system and method A method of analyzing characteristics of a subterranean formation includes applying a wavelet transform to measured data or to derived data obtained from the measured data, the measured data obtained by measuring a physical property at each of a plurality of positio... | 02/28/2012 |
| 8116979 | System and method for determining a more accurate resistivity model of a geological formation using time-lapse well logging data A system and a method for estimating a model of a geological formation are provided. The geological formation has a wellbore extending therethrough. The method includes obtaining a first resistivity log associated with the geological formation from a LWD sensor in t... | 02/14/2012 |
| 8112227 | 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. ... | 02/07/2012 |
| 8112228 | Statistical correction for standoff in two-terminal imager operating in oil-based mud An apparatus, method and computer-readable medium for estimating a resistivity property of an earth formation in a borehole filled with oil-based mud. The method includes conveying a logging tool into a borehole; measuring a plurality of impedance values of the eart... | 02/07/2012 |
| 8095316 | Well log normalization A method of normalizing well log data relating to geology of a subsurface region includes identifying a pair of markers defining a zone on each well log, determining a statistic for a property within the zone for each well log, fitting a smooth function to the stati... | 01/10/2012 |
| 8095317 | Downhole surveying utilizing multiple measurements Certain embodiments described herein provide a measure of the misalignment of multiple acceleration sensors mounted in the downhole portion of a drill string. In certain embodiments, the measure of the misalignment corresponds to a measure of sag which can be used t... | 01/10/2012 |
| 8060309 | Characterization of fracture length and formation resistivity from array induction data Measurements made by a multi-array/multi-frequency induction resistivity logging tool in a borehole are used for determining the length of fractures in an earth formation and the resistivity of the unfractured formation when the fractures have a resistive fluid. A l... | 11/15/2011 |
| 8050865 | System and method for measuring resistivity parameters of an earth formation Disclosed herein is a method of measuring a resistivity parameter of an earth formation. The method includes: applying a first electric measurement current including a first series of pulses to a first electrode and inducing a first formation current in the earth fo... | 11/01/2011 |
| 8046170 | Apparatus and method for estimating eccentricity effects in resistivity measurements A method of evaluating an earth formation is disclosed which includes conveying a logging tool into a borehole in the earth formation and using the logging tool to obtain a first set of azimuthally-independent resistivity measurements of the earth formation and a se... | 10/25/2011 |
| 8019547 | Remotely reconfigurable system for mapping subsurface geological anomalies Methods and apparatus are provided for receiving, detecting and transmitting geophysical data from a plurality of electrodes placed in the soil utilizing a dynamically reconfigurable wireless control unit that is located on each electrode. Data from the control unit... | 09/13/2011 |
| 8010290 | Method of optimizing a well path during drilling A method for determining a list of survey points for a drilling well includes a feedback loop in which one or more measured parameters are compared with computed or derived parameters. The computed parameters are typically obtained from other/additional measurements... | 08/30/2011 |
| 8005618 | Logging while drilling system A logging-while-drilling system for efficiently providing a reliable measurement of various petrophysical properties of subsurface earth formations. The logging-while-drilling system generally includes drilling a wellbore within an earth formation, circulating a flu... | 08/23/2011 |
| 8005619 | Method of determining reservoir parameters A method of determining the effect of formation porosity on formation resistivity and parameters derived from the formation resistivity is described, including the step of determining for a depth interval a heterogeneity measure; and using a pre-defined relation to ... | 08/23/2011 |
| 7983845 | Method and system for analyzing a laminated sand/shale formation A method for analyzing a formation, that includes plotting resistivity data points on a resistivity graph to obtain plotted resistivity data points, and selecting a first shale point on the resistivity graph based on the plotted resistivity data points. The first sh... | 07/19/2011 |
| 7962287 | Method and apparatus for optimizing magnetic signals and detecting casing and resistivity A wellbore tool for optimizing magnetic signals is provided. The wellbore tool has a tool body and an electric current driving device with an insulated gap on the downhole tool body. The electric current driving device generates electric current across the gap. The ... | 06/14/2011 |
| 7957904 | True amplitude transient electromagnetic system response measurement A method for mapping sub-surface resistivity contrasts comprising making multi-channel transient electromagnetic (MTEM) measurements using at least one electric source with grounded input current electrodes or one magnetic source with current in a wire loop or multi... | 06/07/2011 |
| 7937222 | Method of determining saturations in a reservoir A method of determining water saturations from a deep-reading resistivity measurement in a reservoir is provided including the step of estimating, through for example a reservoir simulation process, a spatial distribution of a parameter related to the water conducti... | 05/03/2011 |
| 7912648 | Method and apparatus for imaging bed boundaries using azimuthal propagation resistivity measurements A method for imaging a geologic deposit using data collected from a borehole includes: selecting an instrument for performing electromagnetic (EM) measurements, the instrument including at least one transmitter and at least one orthogonally oriented receiver; obtain... | 03/22/2011 |
| 7899622 | Sequential resistivity imaging with asymmetric electrode arrays A method and instrument provide a very detailed symmetric resistivity image of a formation. A first asymmetric resistivity image is collected from a first arrangement of electrodes, which form an asymmetric sensor. A second asymmetric resistivity image is collected ... | 03/01/2011 |
| 7801681 | Method for phase and amplitude correction in controlled source electromagnetic survey data The method for correcting the phase of measured electric signals or magnetic signals of field data from a controlled source electromagnetic survey (CSES) by comparing the measured field data corresponding to a selected frequency to the simulated data for various sig... | 09/21/2010 |
| 7778778 | Correction of multi-component measurements for tool eccentricity in deviated wells Measurements made by a multi-component induction logging tool are corrected for tool eccentricity in a deviated borehole. The eccentricity angle is determined from single frequency skin-effect corrected data and is then used to correct multifrequency data. Multifreq... | 08/17/2010 |
| 7765067 | 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 relative dip angles in an ear... | 07/27/2010 |
| 7756642 | 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 response to transmission by one or more EM sources is received. Based... | 07/13/2010 |
| 7747387 | Providing increased number of measurements and deeper depth of investigation from existing resistivity tool hardware Resistivity measurements are made with a propagation resistivity tool in a plurality of different modes wherein the antennas may be used as both transmitters or receivers. It is emphasized that this abstract is provided to comply with the rules requiring an abstract... | 06/29/2010 |
| 7689363 | Dual standoff resistivity imaging instrument, methods and computer program products A resistivity imaging apparatus includes: a first sensor electrode disposed on an electrode pad and positioned at a first standoff; a second sensor electrode disposed on the electrode pad and adjacent the first sensor electrode, the second sensor electrode positione... | 03/30/2010 |
| 7657377 | Azimuthal measurement-while-drilling (MWD) tool Various systems and methods determine a distance, magnitude, and azimuthal angle describing the location of an anomaly within a geologic formation. For example, a method involves identifying an electrical characteristic (e.g., resistivity or conductivity) at each of... | 02/02/2010 |
| 7617050 | Method for quantifying resistivity and hydrocarbon saturation in thin bed formations A method for estimating hydrocarbon volume in a layered subsurface formation includes determining a vertical resistivity and a horizontal resistivity in the formation. A bound water saturation and a total porosity of individual layers of the formation are determined... | 11/10/2009 |
| 7567869 | 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... | 07/28/2009 |
| 7565245 | 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 fie... | 07/21/2009 |
| 7555390 | Petrophysical interpretation of multipass array resistivity data obtained while drilling Resistivity measurements at different radial depths of investigation obtained from time lapse resistivity data gained from multiple passes of a resistivity tool through a borehole are analyzed together to obtain indications of at least one of fractional flow, residu... | 06/30/2009 |
| 7532983 | Method and apparatus for measuring the wettability of geological formations The invention discloses a method for determining the wettability of an underground formation traversed by a borehole, the method comprising: determining the critical water fraction of the underground formation; determining the critical water fraction of the undergro... | 05/12/2009 |
| 7519474 | Method and apparatus for measuring the resistivity of electromagnetic waves of the earth A method for measuring electromagnetic wave resistivity of earth formations is provided. The method uses electric field and magnetic field sensors in conjunction with a data collecting system to obtain data samples from strata, determine certain parameters associate... | 04/14/2009 |
| 7505851 | Use of multi-component measurements in delineating geology of deep-water sediments Multicomponent induction measurements are used to estimate horizontal and vertical resistivities of an earth formation. From these resistivity estimates, Net/gross sand thicknesses may be estimated. These are indicative of the position of the well within a deep wate... | 03/17/2009 |
| 7502691 | Method and computer program product for determining a degree of similarity between well log data A computer program product includes machine readable instructions stored on machine readable media, the instructions for correlating nuclear magnetic resonance (NMR) well logging data with other well logging data, the product including instructions for: receiving th... | 03/10/2009 |
| 7496451 | Real time data quality control and determination of formation angles from multicomponent induction measurements using neural networks Neural networks may be used to determine and predict formation dip angles and perform quality assurance assessments from data collected with a multi-component induction tool used for well logging. The neural networks make use of corrected, rotated and normalized dat... | 02/24/2009 |
| 7483793 | Method of generating a deep resistivity image in LWD measurements A pseudo-image is produced by combining deep-reading azimuthally sensitive resistivity measurements with azimuthally insensitive resistivity measurements made by a multiple propagation resistivity tool. This image is useful in reservoir navigation. Features on the a... | 01/27/2009 |
