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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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7263443 |
Computing water saturation in laminated sand-shale when the shale are anisotropic
A method to determine water saturation of laminated sand-shale formations based on measurements of formation and shale resistivity anisotropy, the fraction of shale, and the porosity.
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7260478 |
Method and device for determining the resistivity in a geological formation crossed by a cased well
The invention concerns a method for determining the resistivity in a formation crossed by a cased well, in which one carries out at least one resistivity log in the cased well and one uses the...
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7251567 |
Electronically calibrated beacon for a horizontal directional drilling machine
A monitoring system for use with a horizontal directional drilling machine and adapted to determine the roll and/or pitch orientation of the downhole tool assembly by detecting signals from a...
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7209834 |
Method and apparatus for estimating distance to or from a geological target while drilling or logging
A system and method estimates the distance between a borehole and a subsurface boundary of interest in a geophysical region. In one embodiment, available existing sensor data for the geophysical...
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7171310 |
Method of estimating electrical parameters of an earth formation with a simplified measurement device model
Briefly, a method of estimating electrical parameters of an earth formation employs a simplified model of a measurement tool or device in transforming or normalizing data measured by the...
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7157915 |
Combined characterization and inversion of reservoir parameters from nuclear, NMR and resistivity measurements
A method of determining the distribution of shales, sands and water in a reservoir including laminated shaly sands using vertical and horizontal conductivities derived from nuclear, NMR, and...
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7158048 |
Identically programmed intelligent electrodes for use in geoelectrical surveys
Apparatus for conducting geophysical surveys comprising a multiplicity of intelligent electrodes provided on a multi-conductor cable, for receiving a command signal in response to which...
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7138803 |
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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7133779 |
Automated borehole geology and petrophysics interpretation using image logs
A method of characterizing a borehole traversing an earth formation including (a) obtaining an array of data from a formation characterization tool, wherein the data describes a section of the...
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7124029 |
Method for evaluating formation properties
Methods for evaluating the properties of formations surrounding a borehole, include the steps of measuring electrical properties of the formation from within the borehole; deriving a model of...
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7120566 |
Method for estimating changes in product life resulting from HALT using exponential acceleration model
A method provides early estimation of product life using accelerated stress testing data. In an embodiment, data measured from a product operating in a first, high-stress environment is used to...
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7091877 |
Apparatus and methods for determining isotropic and anisotropic formation resistivity in the presence of invasion
A logging tool includes a tool body; a simple transmitter comprising a single antenna disposed on the tool body; four simple receivers, each comprising a single antenna, disposed on the tool body...
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7076370 |
Method for determining borehole corrections for well-logging tools
A method for producing borehole-compensated values from non-borehole-compensated measurement signals taken with a logging device in a borehole in earth formations, includes the following steps:...
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7062072 |
Methods of producing images of underground formations surrounding a borehole
A method of producing images of formations surrounding a borehole, comprises: obtaining values of a first parameter in the borehole as a function of depth and azimuth at a first resolution;...
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7043370 |
Real time processing of multicomponent induction tool data in highly deviated and horizontal wells
A method is discussed for obtaining resistivity values in a horizontal or highly-deviated wellbore penetrating an anisotropic formation layer. Multi-component data is obtained from the formation...
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7038455 |
Electromagnetic wave resistivity tool
A method and system of operating an electromagnetic resistivity tool wherein at least one transmitting antenna of the tool is selectively operable at three or more resonant frequencies for better...
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7031839 |
Multi-frequency focusing for MWD resistivity tools
An induction logging tool is used on a MWD bottom hole assembly. Due to the finite, nonzero, conductivity of the mandrel, conventional multi frequency focusing (MFF) does not work. A correction is...
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7027922 |
Deep resistivity transient method for MWD applications using asymptotic filtering
A method is discussed of obtaining a parameter of interest of an earth formation, typically a formation resistivity or a distance to a bed boundary, in conditions where an induction tool is using...
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7027923 |
Method for determining sonde error for an induction or propagation tool with transverse or triaxial arrays
A method for determining a sonde error in a logging tool comprising a transverse array includes obtaining a first measurement using the transverse array while the logging tool is at a first height...
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7010429 |
Induction logging system and method featuring multi-frequency skin effect correction
A system and method of correcting skin effect of conductivity measurements made by electromagnetic induction well logging instruments. A limited number of measurements using different frequencies...
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7003401 |
Adjustment for frequency dispersion effects in electromagnetic logging data
Method and apparatus are provided for adjusting electromagnetic well logging data for effects of frequency dispersion. In exemplary embodiments, a model is provided for estimating an electrical...
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7003400 |
Apparatus and method for displaying subsurface anomalies and surface features
The present invention provides a method of combining various types of data and software in order to arrive at a composite graphical representation of a construction site, including surface and...
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6999878 |
Method and installation for locating the position of the boundary formed at the interface between two fluids contained in a reservoir
Process for the location of the position of the interface ( 5 ) between two fluids (f 1 , f 2 ) each contained in a zone ( 7 - 1, 7 - 2 ) of a reservoir ( 4 ) in which: a) a reference transient...
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6985814 |
Well twinning techniques in borehole surveying
A method for surveying a borehole is provided. The method includes providing a tool having a magnetic field measurement device disposed thereon and positioning the tool in a borehole. Magnetic...
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6961663 |
Borehole compensation system and method for a resistivity logging tool
System and method for borehole compensation. The method includes simultaneously transmitting at least two modulated signals from one or more transmitters; receiving the at least two modulated...
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6950747 |
Methods of processing magnetotelluric signals
A method for processing magnetotelluric signals to identify subterranean deposits is provided for. The methods comprise obtaining magnetotelluric data from an area of interest. The magnetotelluric...
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6950748 |
Methods and systems for resistivity anisotropy formation analysis
Techniques for determining a formation property by simplifying various two-geological-layer or multi-geological-layer models into a multi-electrical-layer model. A volume fraction of a layer in a...
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6950749 |
Method for resistivity anisotropy determination in near vertical wells
A method is disclosed for real-time (well-site) resistivity anisotropy determination using array lateral logs or any other unfocused, lateral-type measurements, and array induction logs or any...
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6944547 |
Automated rig control management system
A system and method for controlling operation of a drilling rig having a control management system, comprises programming the control system with at least one resource module, the at least one...
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6932167 |
Formation testing while drilling data compression
A compression scheme for reducing the amount of data that must be transmitted uplink from a formation test while drilling apparatus. Periodic samples are taken within the formation test apparatus...
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6934635 |
Apparatus and method for measurement of the magnetic induction tensor using triaxial induction arrays
An apparatus and a method for recording the magnetic induction tensor induced in an earth formation are provided. The apparatus includes a magnetic induction device having at least three mutually...
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6928399 |
Method and program for simulating a physical system using object-oriented programming
The invention relates to an object-oriented method for simulating a property of at least one fluid in a fluid-containing physical system in which the physical system is represented by a...
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6924646 |
System and method for locating a fracture in an earth formation
The invention relates to techniques for locating and determining the orientation of a fracture in an earth formation. Systems and methods for detecting a fracture in an earth formation using a...
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6925384 |
Method for resistivity anisotropy determination in conductive borehole environments
A method for determining formation resistivity anisotropy in a wellbore environment. The method of the present invention effectively extends the dynamic range of the existing well logging service...
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6917303 |
Logging sondes for use in boreholes
A wireline logging sonde for sensing fluid properties in a bore hole. The sonde has a main body and a plurality of sensor capsules mounted peripherally to the main body on fingers. A sensor element...
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6912467 |
Method for estimation of size and analysis of connectivity of bodies in 2- and 3-dimensional data
A method for performing region growing in a data volume that accounts for noise in the data on a probabilistic basis. The data volume is divided into discrete cells, and a probability distribution...
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6885947 |
Method for joint interpretation of multi-array induction and multi-component induction measurements with joint dip angle estimation
Data are acquired using multi-array logging tool in a borehole having an angle of inclination to a normal to the bedding plane of earth formations. The multi-array measurements are filtered using...
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6885943 |
Simultaneous resolution enhancement and dip correction of resistivity logs through nonlinear iterative deconvolution
A nonlinear iterative deconvolution method and system. In one embodiment, the system comprises a data acquisition module, a storage module, and a processing module. The data acquisition module...
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6859733 |
Method for determining parameters of earth formations surrounding a well bore
A method for determining a formation profile surrounding a well bore includes receiving field log data for the formation and generating a Jacobian matrix responsive to the provided field log data....
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6856909 |
Detecting a boundary in a formation
Detecting in an earth formation a boundary between first and second formation regions having different resistivities, wherein the first formation region is traversed by a wellbore, using a logging...
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6834252 |
Method of and apparatus for analyzing population distribution, and computer product
The population distribution analyzing apparatus is provided with the area setting unit which sets an area in which population distribution of a plurality of users respectively carrying a portable...
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6819111 |
METHOD OF DETERMINING VERTICAL AND HORIZONTAL RESISTIVITY, AND RELATIVE DIP IN ANISOTROPIC EARTH FORMATIONS HAVING AN ARBITRARY ELECTRO-MAGNETIC ANTENNA COMBINATION AND ORIENTATION WITH ADDITIONAL ROTATION AND POSITION MEASUREMENTS
The invention is a method of determining horizontal and vertical resistivity in an anisotropic formation using a combination of orientable triaxial and array antennae conveyed downhole....
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6819112 |
Method of combining vertical and magnetic dipole induction logs for reduced shoulder and borehole effects
There is disclosed herein a method of enhancing the vertical resolution of an induction tool, in a manner that may advantageously also reduce undesirable borehole and “negative resistivity”...
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6816787 |
Generating and displaying a virtual core and a virtual plug associated with a selected piece of the virtual core
A visualization application will generate a Virtual Core representing a compilation of any formation property data, the compilation being a 2 and 1/2 D representation of any formation property. The...
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6810331 |
Fixed-depth of investigation log for multi-spacing multi-frequency LWD resistivity tools
A system and related method for obtaining electromagnetic resistivity logs of a formation having fixed depths of investigation that differ from the actual depths of investigation for the tool. The...
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6795774 |
Method for asymptotic dipping correction
Induction and other resistivity well logging tools determine formation conductivity at various depths but these measurements contain pronounced errors when the tool is proximate to an inclined...
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6794875 |
Induction well logging apparatus and method
A coil arrangement and method of collecting and processing data in induction logging of wells is disclosed. The coil arrangement includes three essentially identical coils made of elliptical...
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