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| Number | Title | Issue Date |
| 8129993 | Determining formation parameters using electromagnetic coupling components A method to determine one or more parameters of a formation traversed by a borehole, at least a portion of the formation having substantially parallel boundaries, the method comprising disposing a tool in the borehole, wherein the tool includes a transmitter having ... | 03/06/2012 |
| 7898260 | Method and apparatus for detecting borehole effects due to eccentricity of induction instruments An apparatus, method and computer-readable medium for evaluating an earth formation are disclosed. A logging tool which has two coplanar antennas disposed at a known distance from an axis of the logging tool is conveyed into a borehole. The presence of a borehole ef... | 03/01/2011 |
| 7839149 | Multi-component resistivity logging tool with multiple antennas using common antenna grooves The disclosure provides a resistivity tool for use in a wellbore, wherein at least two orthogonal antennas are located at the same or substantially the same location of the tool. A single set of vertically aligned grooves is provided for the at least two orthogonal ... | 11/23/2010 |
| 7737697 | 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 horizontal resistivities. Using the determined horizontal resistivities an... | 06/15/2010 |
| 7663372 | Resistivity tools with collocated antennas A resistivity tool for use in a wellbore is provided. The resistivity tool, in one embodiment, may include a longitudinal tool member, a first set of slots at a selected location in the longitudinal tool member and a conductor associated with the first set of slots ... | 02/16/2010 |
| 7554328 | Method and apparatus for reducing borehole and eccentricity effects in multicomponent induction logging An apparatus, method and computer-readable medium for evaluating an earth formation. A logging tool having a non-conductive mandrel and a conducting sleeve having at least one antenna that are electrically connected is conveyed into a borehole in the earth formation... | 06/30/2009 |
| 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 ring section’ (or arcuate shaped member) contains an antenna coil. In ... | 10/14/2008 |
| 7362282 | OFDM transmission system With the objective of reducing noise components to thereby avoid degradation of receiving characteristics, by making an antenna arrangement having taken into consideration transfer functions for radio wave propagation in an MIMO system, the present invention provide... | 04/22/2008 |
| 7348781 | Apparatus for electromagnetic logging of a formation A tool for electromagnetic logging of a formation includes a tool body configured to move in a borehole penetrating the formation; an antenna array disposed on the tool body; and an electronic unit configured to control operation of the antenna array, wherein the an... | 03/25/2008 |
| 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 horizontal resistivities. Using the determined horizontal resistivities an... | 02/26/2008 |
| 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 the value of the selected cross-component. A misalignment angle of t... | 02/19/2008 |
| 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 the TI models and a measured cross-bedding angle. Resistivity informati... | 01/08/2008 |
| 7286091 | Co-located antennas Techniques for implementing antenna configurations with substantially co-located axes are disclosed. A method for constructing co-located antennas includes winding a first antenna on a support, the first antenna having a first magnetic dipole in a first orientation;... | 10/23/2007 |
| 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 of modes, the principal components and relative dip angles in an ani... | 09/25/2007 |
| 7268556 | Method and apparatus for a multi-component induction instrument measuring system for geosteering and formation resistivity data interpretation in horizontal, vertical and deviated wells An improved induction tool for formation resistivity evaluations. The tool provides electromagnetic transmitters and sensors suitable for transmitting and receiving magnetic fields in radial directions that are orthogonal to the tool's longitudinal axis with minimal... | 09/11/2007 |
| 7269515 | 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 of modes, the principal components and relative dip angles in an ani... | 09/11/2007 |
| 7268555 | Correction of cross-component induction measurements for misalignment using comparison of the XY formation response A multicomponent induction logging tool includes a transmitter antenna and two receiver antennas, one of which is aligned parallel to the transmitter. Using measurements made at a plurality of rotational angles, a misalignment angle between the transmitter antenna a... | 09/11/2007 |
| 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 formations. The present invention accomplishes this objective by using an ante... | 09/04/2007 |
| 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 between the arrays of receivers, or by analyzing amplitude and phase... | 06/12/2007 |
| 7191850 | Formation dip geo-steering method A method of drilling a well includes calculating and estimating the dip angle, wherein said estimated dip angle being based on offset well data, seismic data, core data, pressure data. Next, the method includes drilling a well with a logging while drilling tool usin... | 03/20/2007 |
| 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 determination of a distance to a bed boundary. This may be used to control the dr... | 01/23/2007 |
| 7148693 | Process and device for prospecting a porous geological formation A porous geological formation contains electrolytic fluid. During the geophysical prospecting of the formation, a region of interest of the formation where the electrolytic fluid is found is stimulated with an excitation signal. The excitation signal corresponds to ... | 12/12/2006 |
| 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 formations. The present invention accomplishes this objective by using an ante... | 11/21/2006 |
| 7049821 | Determination of borehole geometry inside cased wells with crosswell electromagnetics A method is disclosed for locating a receiver in a borehole having a conductive liner by inducing an electromagnetic field from a transmitter in a first borehole, detecting at a first location by at least one receiver located in a second borehole having a conductive... | 05/23/2006 |
| 7046009 | 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 determination of a distance to a bed boundary. This may be used to control the dr... | 05/16/2006 |
| 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 layer. An initial value of horizontal and vertical resistivity can be d... | 05/09/2006 |
| 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 made to the induction logging data to give measurements simulating a ... | 04/18/2006 |
| 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 having a body with finite, non-zero conductivity. The method substanti... | 04/11/2006 |
| 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 from ground in a selected orientation; obtaining a second measurement... | 04/11/2006 |
| 7019528 | Electromagnetic wave resistivity tool having a tilted antenna for geosteering within a desired payzone A method and apparatus for use within a borehole for simultaneously determining the horizontal resistivity, vertical resistivity, and relative dip angle for anisotropic earth formations. An antenna configuration in which a transmitter antenna and a receiver antenna ... | 03/28/2006 |
| 6998844 | Propagation based electromagnetic measurement of anisotropy using transverse or tilted magnetic dipoles Transverse or tilted magnetic dipole antenna systems are used for electromagnetic logging measurements to determine the anisotropic resistivity of subsurface formations. Combined measurements between transverse or tilted antennas, as well as axial antennas, are used... | 02/14/2006 |
| 6997257 | Apparatus and method for determining the dip of an underground formation in a cased or uncased borehole A well logging system that has, as its goal, the collection of information normally acquired by a dip log tool based on conductivity or resistivity measurements, but with the advantages of radiation based well logging systems. Unlike conductivity based dip log syste... | 02/14/2006 |
| 6969994 | Directional electromagnetic measurements insensitive to dip and anisotropy Systems and methods are provided for directional propagation-type logging measurements not sensitive to dip and anisotropy over a wide frequency range. Estimates of the distance of the logging tool to a bed boundary are obtained using “up-down” measurements with... | 11/29/2005 |
| 6958610 | Method and apparatus measuring electrical anisotropy in formations surrounding a wellbore A logging tool is disclosed having transmitting and receiving antennas to measure formation anisotropy. The antennas may preferably be combinations of toroidal, horizontal electric dipole, and horizontal magnetic dipole antennas. In one embodiment, the tool: (a) ind... | 10/25/2005 |
| 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 multi-electrical-layer model is determined for an anisotropic region (... | 09/27/2005 |
| 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 other focused, induction-type measurements. Near-vertical wells with a de... | 09/27/2005 |
| 6937021 | Method and apparatus for determining the presence and orientation of a fraction in an earth formation The invention relates to a system and methods for locating a fracture in an earth formation. A method for detecting a fracture in an earth formation using an induction tool includes inducing electromagnetic fields using a set of transmitters on the induction tool. A... | 08/30/2005 |
| 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 orthogonal transmitter dipoles and at least three mutually orthogonal ... | 08/23/2005 |
| 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 propagation tool include producing electromagnetic fields using a TMD tra... | 08/02/2005 |
| 6925031 | Method of using electrical and acoustic anisotropy measurements for fracture identification Measurements made by a cross-dipole acoustic logging tool in a borehole are processed to determine the principal directions of azimuthal anisotropy of a subsurface formation. Measurements indicative of azimuthal resistivity variations are also made with a multicompo... | 08/02/2005 |
