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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...
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7609066 |
Apparatus and method for measuring micro-resistivity anisotropy
A method for measuring anisotropy in thin-bed formations calls for placing a logging tool into a borehole in the formation and applying current to at least one set of injection electrodes and at...
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7599797 |
Method of mitigating risk of well collision in a field
A method and system for mitigating risk of well collision in a field includes receiving an anti-collision standard exemption request containing a description of risk of collision between a subject...
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7576543 |
Apparatus and method for resistivity measurements during rotational drilling
A resistivity sub including a resistivity sensor forms part of a bottom hole drilling assembly. The sensor is maintained at a substantially fixed offset from the wall of a borehole during drilling...
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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...
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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...
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7565244 |
Method and system for removing effects of conductive casings and wellbore and surface heterogeneity in electromagnetic imaging surveys
Characterizing a reservoir with electromagnetic imaging surveys includes normalizing measured voltage data by transmitter moment, sorting the normalized voltage data into common receiver profiles,...
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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...
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7542851 |
Electromagnetic surveying for hydrocarbon reservoirs
A method of analyzing results from an underwater controlled source electromagnetic (CSEM) survey of an area that is thought or known to contain a subterranean hydrocarbon reservoir is described....
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7536262 |
Kalman filter approach to processing electromagnetic data
A method for tracking a sinusoidal electromagnetic signal in noisy data using a Kalman filter or other tracking algorithm. The method is useful for controlled source electromagnetic surveying where...
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7536261 |
Anti-symmetrized electromagnetic measurements
A method to determine a parameter of a subsurface formation such as anisotropy and dip comprises making at least two cross dipole measurements and forming an anti-symmetrized combination from the...
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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...
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7529624 |
Method and apparatus for remote characterization of faults in the vicinity of boreholes
A method and system for characterization of fault conditions within a subterranean volume. In one embodiment, the system comprises means for mathematically modeling stress conditions, to predict...
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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...
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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...
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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...
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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....
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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...
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7471088 |
Elimination of the anisotropy effect in LWD azimuthal resistivity tool data
Cross-component measurements made with a dual-transmitter configuration are processed to estimate a distance to an interface in an anisotropic earth formation. Optionally, measurements may be made...
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7457707 |
Method for determining an effective formation conductivity for induction log borehole correction
A method for correcting induction conductivity well log measurements for conductivity of a wellbore and a formation proximate the wellbore includes estimating an effective formation conductivity...
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7427862 |
Increasing the resolution of electromagnetic tools for resistivity evaluations in near borehole zones
A tool for performing electromagnetic measurements within a borehole includes a transmitter including a coil having N-turns wound coaxially around a long metallic mandrel and a receiver including a...
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7414391 |
Electromagnetic logging tool calibration system
Techniques for calibrating an electromagnetic logging tool equipped with a plurality of antennas, with at least one antenna having its axis at an angle with respect to a tool axis, include...
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7400977 |
Computing values for surveying a subterranean structure based on measurements according to different electromagnetic survey techniques
To survey a subterranean structure, first measurement data according to a first electromagnetic survey technique and second measurement data according to a second, different electromagnetic survey...
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7398180 |
Vehicle technician time clock tool
A vehicle technician time clock tool comprises a computer-implemented interface to a database, wherein the database contains vehicle service task-related information and time-related information,...
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7392137 |
Determination of formation anistrophy, dip and azimuth
Multifrequency focusing is applied to measurements made with a multicomponent resistivity logging tool in an earth formation having resisitivity anisotropy. From knowledge of relative dip and...
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7386430 |
Method of correcting triaxial induction arrays for borehole effect
A method for modeling borehole effects of a transverse array induction tool includes selecting a formation-borehole model having a set of parameters, wherein the set of parameters comprises a...
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7376515 |
System and method for CSEM exploration in polar regions
There is provided herein a system and method of collecting, EM data in the context(s) of hydrocarbon exploration, appraisal, development, and surveillance, which provides improved ground coupling...
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7376514 |
Method for determining properties of earth formations using dielectric permittivity measurements
Techniques for estimating the fraction of water in formations being investigated use measurements of dielectric permittivity at a number of frequencies. The techniques have the advantage of...
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7363161 |
Pore-scale geometric models for interpretation of downhole formation evaluation data
The grain size of a pore-scale geometric model of a clastic earth formation are adjusted so that the NMR relaxation time distribution output of the model matches a measured NMR distribution. Fluid...
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7363160 |
Technique for determining properties of earth formations using dielectric permittivity measurements
Techniques for determining formation characteristics use measurements of dielectric permittivity at a number of frequencies. Determined characteristics include the vertical and horizontal formation...
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7363159 |
Method of determining resistivity and/or dielectric values of an earth formation as a function of position within the earth formation
A technique of estimating electrical parameters of an earth formation accounts for spatial inhomogeneities and frequency dispersion. The results are achieved using a model which is evaluated to...
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7359845 |
Method and system for predictive stratigraphy images
Methods and systems are provided for displaying and forecasting the lithology and wellbore conditions to be encountered while conducting drill string operations in a wellbore. A method and system...
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7359800 |
Determination of fracture orientation and length using multi-component and multi-array induction data
Measurements made by multiarray and multicomponent induction resistivity measurements in a borehole are used for determining the orientation and length of fractures in an earth formation when the...
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7356411 |
Method for acquiring and interpreting transient electromagnetic measurements
A method for interpreting transient electromagnetic survey data includes measuring transient response of a medium over a plurality of switching events. The measured transient response to a first...
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7336080 |
Method and apparatus for use of the real component of a magnetic field of multicomponent resistivity measurements
Multi-component induction measurements are made using a resistivity logging tool in an anistropic earth formation. A subset of the multi-component measurements are inverted to first determine...
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7333893 |
Method for spatially interpreting electromagnetic data using multiple frequencies
Method for removing effects of shallow resistivity structures in electromagnetic survey data to produce a low frequency resistivity anomaly map, or alternatively imaging resistivity structures at...
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7333891 |
Correction of cross-component induction measurements for misalignment using comparison of the XY formation response
Measurements are made with a multicomponent logging tool in an earth formation. The measurements are inverted without using a selected cross-component measurement. The model is then used to predict...
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7324899 |
Geophysical technique for mineral exploration and discrimination based on electromagnetic methods and associated systems
Mineral exploration needs a reliable method to distinguish between uneconomic mineral deposits and economic mineralization. A method and system includes a geophysical technique for subsurface...
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7324898 |
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...
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7317991 |
Multicomponent induction measurements in cross-bedded and weak anisotropy approximation
Multicomponent measurements made in a cross-bedded earth formation are processed to give one or more equivalent TI models. Resistivity information about the cross-bedding is obtained from one of...
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7313479 |
Method for real-time well-site interpretation of array resistivity log data in vertical and deviated wells
A method and apparatus for real-time well-site interpretation of array resistivity log data. An inversion of data with different depths of investigation is carried out after data shoulder-bed...
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7302375 |
Simulation of processes, devices and circuits by a modified newton method
Roughly described, a method for numerically solving a system of equations of the form
0= F ( X ),
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7299131 |
Induction resistivity imaging principles and devices in oil based mud
An induction logging tool having transmitter and receiver antennas is used to make measurements of earth formations. The antennas may be mounted on the mandrel of a bottomhole assembly for MWD...
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7295928 |
Enhancing the quality and resolution of an image generated from single or multiple sources
The present invention provides a method and apparatus for logging an earth formation and acquiring subsurface information wherein a logging tool is conveyed in a borehole to obtain parameters of...
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7295927 |
Determining water saturation for oil bearing thin-bedded formation having anisotropic resistivity
A method to estimate water saturation (S w ) of a thin-bedded formation is provided including (a) developing a model of anisotropy of resistivity (R v /R h ) a function of water saturation (S wt )...
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7286937 |
Estimating formation properties from downhole data
Methods and systems for extracting formation properties from formation logging data is disclosed. A method includes obtaining a deconvolution filter; and processing the formation logging data using...
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7277796 |
System and methods of characterizing a hydrocarbon reservoir
A technique is described for interpretation of IPTT tests. In one implementation, the technique may be configured or designed to standardize the complete interpretation procedure of IPTT in a...
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7274991 |
Geosteering in anisotropic 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...
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7272503 |
Method and apparatus for measuring formation conductivities from within cased wellbores by combined measurement of casing current leakage and electromagnetic response
A method for determining spatial distribution of resistivity of Earth formations surrounding a wellbore having a conductive pipe therein includes measuring resistivity of the Earth formations using...
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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...
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