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7619540 |
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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7609065 |
System and method for locating an anomaly
A method and a system are provided for allowing determination of a direction and distance from a tool to anomaly in a formation. The apparatus for performing the method includes at least one...
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7595636 |
Apparatus and method of using accelerometer measurements for casing evaluation
A casing inspection device with magnets and flux sensors. Measurements of axial motion of the device are used to get better definition of the axial extent of casing defects. A contact device may be...
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7586307 |
Locating arrangement and method using boring tool and cable locating signals
An arrangement and an associated method are described in which a boring tool is moved through the ground within a given region along a path in which region a cable is buried. The boring tool and...
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7583085 |
Downhole sensor assembly
In one aspect of the invention, a sensor assembly for incorporation into a downhole tool string comprises at least one sensor adapted to detect changes in magnetic flux proximate a first portion of...
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7579840 |
Broadband resistivity interpretation
Resistivity measurements are made at a plurality of frequencies. An asymptotic high-frequency limit is determined and the electrical efficiency is estimated as a ratio of the high frequency...
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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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7557582 |
Logging while drilling tool for obtaining azimuthally sensitive formation resistivity measurements
An apparatus for making azimuthally sensitive resistivity measurements of a subterranean formation is disclosed. The apparatus includes a magnetically permeably ring deployed about an electrically...
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7557581 |
Method for imaging subterranean formations
A method of imaging a subterranean formation traversed by a wellbore using a tool comprising a transmitter for transmitting electromagnetic signals through the formation and a receiver for...
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7538555 |
System and method for locating an anomaly ahead of a drill bit
A method and a system are provided for allowing determination of a distance from a tool to anomaly ahead of the tool. The apparatus for performing the method includes at least one transmitter and...
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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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7501829 |
Extra bucking coils as an alternative way to balance induction arrays
An electromagnetic logging that includes a support; and at least one four-coil array disposed on the support, wherein the at least one four-coil array comprises: a transmitter, a bucking coil, a...
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7495446 |
Formation evaluation system and method
A formation evaluation system for a subterranean formation penetrated by a wellbore. The formation evaluation system is provided with a downhole tool and a sensor. The downhole tool is positionable...
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7482812 |
Series-resonant tuning of an LWD receiver
A loop antenna useful, for example, in investigation of earth formations. Embodiments of the invention provide a loop antenna circuit comprising a loop antenna disposed to generate, in response to...
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7477161 |
Bidirectional telemetry apparatus and methods for wellbore operations
A system and method for communicating data between a downhole tool and a surface controller is provided that comprises a rotating drill string extending in a borehole and having a downhole...
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7477160 |
Wireless communications associated with a wellbore
A subsea communication system includes addressable nodes in a wellbore and addressable nodes on a floor, where the nodes in the wellbore and on the floor are able to communicate wirelessly with...
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7474101 |
Method for combined transient and frequency domain electromagnetic measurements
A method for interpreting transient electromagnetic survey data includes imparting an electromagnetic field in the Earth's subsurface by passing electric current through a transmitter antenna. The...
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7450053 |
Logging device with down-hole transceiver for operation in extreme temperatures
A logging radar system and method for measuring propped fractures and down-hole formation conditions in a subterranean formation including: a radar source; an optical source; an optical modulator...
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7437251 |
Correction of sensor non-equipotentiality in a resistivity imaging device
A method for correcting data from at least one sensor electrode in a sensor includes determining a potential difference (V) between two electrodes; from the potential difference (V), determining a...
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7436184 |
Well logging apparatus for obtaining azimuthally sensitive formation resistivity measurements
An apparatus for making azimuthally sensitive resistivity measurements of a subterranean formation is disclosed. The apparatus includes a magnetically permeably ring deployed about an electrically...
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7436183 |
Replaceable antennas for wellbore apparatus
An antenna structure is separately and independently formed with respect to a downhole tool. The antenna is adapted for easy and rapid deployment on the tool. An independently formed ‘partial...
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7425831 |
System and method for locating an anomaly
A method and a system are provided for allowing determination of a direction and distance from a tool to anomaly in a formation. The apparatus for performing the method includes at least one...
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7420367 |
High-frequency induction imager with concentric coils for MWD and wireline applications
An induction logging tool having concentric transmitter and receiver antennas can be used to make measurements of earth formations at frequencies up to 500 MHz. The antennas may be mounted on the...
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7417436 |
Selectable tap induction coil
An electromagnetic logging tool includes a support configured for disposal in a well; at least one antenna mounted on the support; and a plurality of coils mounted on the support proximate the at...
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7414407 |
Method and apparatus for directional resistivity measurement while drilling
A resistivity tool has a body with at lest one pair of grooves on its exterior oriented orthogonal to the tool axis. A coil antenna is oriented orthogonal to the grooves in a hole intersecting the...
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7414405 |
Measurement tool for obtaining tool face on a rotating drill collar
An apparatus for obtaining tool face angles on a rotating drill collar in substantially real time is disclosed. In one exemplary embodiment the apparatus includes a magnetoresistive magnetic field...
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7403013 |
Boring tool tracking/guiding system and method with unconstrained target location geometry
Tracking a boring tool is performed within an underground region using a locating signal. The boring tool is moved through the ground during a series of distance movements such that potential...
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7403000 |
Apparatus and method of determining casing thickness and permeability
A casing inspection device with magnets and flux sensors. The sensors provide measurements of absolute levels of magnetic flux that are indicative of changes in casing thickness and/or permeability.
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7391216 |
Locating arrangement and method using boring tool and cable locating signals
An arrangement and an associated method are described in which a boring tool is moved through the ground within a given region along a path in which region a cable is buried. The boring tool and...
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7388379 |
Series-resonant tuning of a downhole loop antenna
A loop antenna useful, for example, in investigation of earth formations. Embodiments of the invention provide a loop antenna circuit comprising a loop antenna disposed to generate, in response to...
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7385400 |
Azimuthally sensitive receiver array for an electromagnetic measurement tool
An azimuthally sensitive logging while drilling tool is disclosed. The tool may be suitable, for example, to measure azimuthal variations of electrical properties of a subterranean formation. The...
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7382135 |
Directional electromagnetic wave resistivity apparatus and method
A novel on-the-fly data processing technique is useful for extracting signals from the azimuthal variation of the directional measurements acquired by a logging tool within a borehole. The relevant...
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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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7347271 |
Wireless communications associated with a wellbore
A subsea communication system includes devices in a wellbore and devices on a floor, where the devices in the wellbore and on the floor are able to communicate wirelessly with each other, such as...
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7345487 |
Method and system of controlling drilling direction using directionally sensitive resistivity readings
A method and system of controlling drilling direction using directionally sensitive resistivity readings. At least some of the illustrative embodiments are methods comprising transmitting an...
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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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7327145 |
Azimuthally focused electromagnetic measurement tool
An azimuthally sensitive electromagnetic measurement tool is provided. The tool may be suitable, for example, to measure azimuthal variations of electrical properties of a subterranean formation....
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7307425 |
Receiver electronics proximate antenna
A resistivity tool includes receiver electronics near each receiver antenna loop. Placement of the electronics in this position such as at the circuit card between the terminal ends of the receiver...
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7282704 |
Method for determining formation porosity and gas saturation in a gas reservoir
Measurements made with porosity and density logging tools in a gas reservoir may differ due to invasion effects. The effects are particularly large on measurement-while-drilling applications where...
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7259564 |
Method and device for determining the position of an interface in relation to a bore hole
The invention concerns a method for determining the position, in a formation ( 1 ) containing at least one electrolytic liquid, of an interface ( 6 ) in relation to a bore hole ( 2 ). One...
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7250768 |
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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7235970 |
Antenna core material for use in MWD resistivity measurements and NMR measurements
The present invention provides a novel use of a material having a high internal magnetostrictive damping and/or using material with explicitly low magnetostriction as an antenna core material for...
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7228903 |
Apparatus and method for wireline imaging in nonconductive muds
A pad mounted resistivity imaging device includes at least one transmitter and two or more arrays of receivers. Analysis of the received signals is done using either amplitude and phase differences...
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7227363 |
Determining formation anisotropy based in part on lateral current flow measurements
Disclosed herein are methods and apparatus using one or more toroids to measure formation anisotropy and/or vertical conductivity. In one embodiment, a disclosed method comprises: inducing a...
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7202670 |
Method for characterizing a subsurface formation with a logging instrument disposed in a borehole penetrating the formation
A method is described for characterizing a subsurface formation with a logging instrument disposed in a borehole penetrating the formation. The logging instrument is equipped with at least a...
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7183771 |
Multiple transmitter and receiver well logging device with error calibration system including calibration injection system
A device and method for obtaining an electromagnetic propagation measurement of a subterranean geologic formation, with the formation being intersected by a borehole. The device comprises a...
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7170294 |
Subsurface imagery for temperature measurement and fluid flow for oil recovery using electromagnetic impedance tomography (EMIT)
A new application of electromagnetic tomography is described directly related to the efficient recovery of oil and gas as well the removal of unwanted liquids from subsurface formations. The...
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7167006 |
Method for measuring transient electromagnetic components to perform deep geosteering while drilling
A transverse induction transmitter on an instrument induces currents in an earth formation when it is pulsed. Transient measurements made at transverse and axial receivers are used for...
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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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