Within A Borehole Patents (Class 324/338)
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Patent number: 7994790Abstract: A transmitter on a bottomhole assembly (BHA) is used for generating a transient electromagnetic signal in an earth formation. A pair of receivers on the BHA receive signals that are indicative of formation resistivity and distances to bed boundaries. A time dependent calibration factor or a time-independent calibration factor may be used to combine the two received signals and estimate the distance to bed boundaries that are unaffected by the drill conductive body. Further improvement can be obtained by using copper shielding.Type: GrantFiled: March 10, 2009Date of Patent: August 9, 2011Assignee: Baker Hughes IncorporatedInventors: Gregory B. Itskovich, Roland E. Chemali, Tsili Wang
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Publication number: 20110187373Abstract: A steerable or non-steerable, magnetic dipole antenna for Measurement-While-Drilling (MWD) or Logging-While-Drilling (LWD) applications. The antenna elements use a hole arrangement in addition to grooves in a steel tool body, which is typically a drill collar. This antenna embodiment is extremely robust, meaning that does not significantly reduce the structural integrity of the tool body in which it is disposed. The antenna embodiment is also relatively wear resistant. The resultant magnetic dipole generated by this antenna is also electrically steerable in inclination angle from a common origin. A variable dipole moment inclination angle combined with independently measured tool rotation orientation during normal drilling allows the antenna to generate a magnetic dipole moment that may be directed at any three dimensional angle and from a common origin point at the centroid of the antenna. The antenna can also be embodied to be more sensitive to resitivity in a particular azimuthal direction.Type: ApplicationFiled: April 12, 2011Publication date: August 4, 2011Applicant: PRECISION ENERGY SERVICES, INC.Inventors: Macmillan M. Wisler, Larry W. Thompson, Jian-Qun Wu, Lance Pate
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Publication number: 20110187372Abstract: NMR measurements are made along with acoustic measurements using one tool. The antenna of the NMR sensor is used to create acoustic signals. Interference between the acoustic and NMR measurements is avoided due to the frequency difference, and by having the acoustic excitation during a wait time of the NMR pulse sequence.Type: ApplicationFiled: February 1, 2011Publication date: August 4, 2011Applicant: Baker Hughes IncorporatedInventor: Thomas Kruspe
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Patent number: 7991555Abstract: An orientation vector, referred to hereinafter as the “geosteering vector,” is directed to the more conductive formation area within the DOI of the tool and away from the more resistive formation areas. Accordingly, drilling in a direction opposite the geosteering vector leads to more resistive formation. Also, the disclosed geosteering vectors obtained from the real and imaginary components will not align with each other for non-planar formations and therefore the misalignment of the geosteering obtained from real and imaginary components is indicative of a non-planar formation. A superposition method is disclosed which can be used to calculate electromagnetic (EM) couplings in a non-planar geometry formation (as well as in a planar geometry formation) in real time, without requiring two or three dimensional modeling calculations.Type: GrantFiled: July 30, 2008Date of Patent: August 2, 2011Assignee: Schlumberger Technology CorporationInventors: Jian Yang, Qiming Li, Dzevat Omeragic, Jean Seydoux, Jacques R. Tabanou, Bernadette Tabanou, legal representative
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Patent number: 7990153Abstract: A method for making directional resistivity measurements includes sequentially transmitting first and second axial and transverse electromagnetic waves in a borehole and receiving substantially pure axial and transverse components of each of the transmitted waves. A composite ratio of the received components is computed and may be utilized as an indicator of various formation parameters. The invention advantageously provides for the acquisition of compensated directional resistivity measurements.Type: GrantFiled: May 11, 2009Date of Patent: August 2, 2011Assignee: Smith International, Inc.Inventors: Christopher C. Streinz, Tsili Wang
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Patent number: 7986144Abstract: A logging sonde includes a tube defining a sealed chamber inside. An isolation layer is disposed on an exterior of the tube. At least one sensor is disposed on an exterior of the isolation layer. The sensor includes a lead in passing through a wall of the tube. An elastomer jacket is disposed on an exterior of the sensor and the isolation layer. A method for making a sonde includes affixing an electrically insulating isolator to an exterior of a tube. An hydraulic seal layer is affixed over an exterior of the isolator. A sensor is affixed over the exterior of the seal layer. An electrical connection is made from the sensor to an interior of the tube through the hydraulic seal layer and through the isolator. An elastomer jacket is applied over the exterior of at least part of the sensor and the exterior of the seal layer.Type: GrantFiled: July 26, 2007Date of Patent: July 26, 2011Assignee: Schlumberger Technology CorporationInventors: Qingyan He, Richard Dan Ward
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Patent number: 7973532Abstract: A plurality of transmitters on a logging tool are activated simultaneously at substantially the same frequency. When the transmitter outputs are phase-modulated using a mutually orthogonal set of modulating functions, it is possible to recover, from the signal at each receiver, a response corresponding to each of the transmitters.Type: GrantFiled: March 14, 2008Date of Patent: July 5, 2011Assignee: Baker Hughes IncorporatedInventors: Stanislav W. Forgang, Roland E. Chemali
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Publication number: 20110133740Abstract: A technique utilizes the acquisition of data from desired subterranean regions via a logging system. The logging system is constructed for use in a wellbore and comprises a transmitter module having a transmitter antenna. Additionally, the logging system utilizes a receiver module spaced from the transmitter module and having a receiver antenna. The transmitter antenna and the receiver antenna are oriented to enable sensitivity in desired directions, such as ahead of the logging system.Type: ApplicationFiled: August 22, 2008Publication date: June 9, 2011Inventors: Jean Seydoux, Emmanuel Legendre, Reza Taherian
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Publication number: 20110128003Abstract: A system, method and device for interrogating a downhole environment in a borehole beneath a surface includes a source of electromagnetic energy, operable to transmit an electromagnetic signal in the borehole, a sensor module, including a passive resonating circuit including a crystal oscillator having a resonant frequency that varies with changes in the condition in the downhole environment to reflect the electromagnetic signal and to modulate the electromagnetic signal in response to a condition in the downhole environment in the borehole and a detector positionable to receive the reflected modulated electromagnetic signal.Type: ApplicationFiled: November 30, 2009Publication date: June 2, 2011Applicants: Chevron U.S.A, Inc., Los Alamos National SecurityInventors: M. Clark THOMPSON, Dipen N. Sinha, Don M. Coates, Jacobo R. Archuletta, Manuel E. Gonzalez
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Patent number: 7952358Abstract: Multi-component induction measurements are made using a resistivity logging tool in an anistropic earth formation. The X-signal (quadrature) is insensitive to borehole eccentricity. A subset of the multi-component measurements are inverted to first determine horizontal resistivities. Using the determined horizontal resistivities and another subset of the multi-component measurements, the vertical resistivities are obtained. Results of using the in-phase signals are comparable to those obtained using multifrequency focusing of quadrature signals.Type: GrantFiled: August 7, 2008Date of Patent: May 31, 2011Assignee: Baker Hughes IncorporatedInventors: Tsili Wang, Cynthia D. Xue, Luis M. Pelegri
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Publication number: 20110068796Abstract: An apparatus for estimating a property of an earth formation penetrated by a borehole, the apparatus having: a carrier configured to be conveyed through the borehole; a transmitter disposed at the carrier and configured to transmit electromagnetic energy at a first frequency into the formation; a first antenna disposed at the carrier and configured to receive electromagnetic signals from the formation as a result of the transmitted electromagnetic energy interacting with the formation; and an active filter coupled to the antenna and configured to filter electromagnetic signals received by the antenna to let the electromagnetic signals at the first frequency pass for processing to estimate the property.Type: ApplicationFiled: September 16, 2010Publication date: March 24, 2011Applicant: BAKER HUGHES INCORPORATEDInventors: Jack Signorelli, Sheng Fang, Samuel Bell
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Method and apparatus for imaging bed boundaries using azimuthal propagation resistivity measurements
Patent number: 7912648Abstract: 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; obtaining EM measurement data from the borehole with the instrument; transforming the EM measurement data to acoustic data; and estimating at least one of a direction and a distance from the instrument to the deposit from the data. A computer program product and a system are provided.Type: GrantFiled: October 1, 2008Date of Patent: March 22, 2011Assignee: Baker Hughes IncorporatedInventors: Xiao M. Tang, Tsili Wang -
Patent number: 7902827Abstract: An induction logging device is provided with additional electrodes. One set of electrodes provides voltages that are indicative of the current distribution in the borehole. The output of the first set of electrodes may be used for estimating formation resistivity. A second set of electrodes may be used to provide an image of the formation.Type: GrantFiled: September 14, 2007Date of Patent: March 8, 2011Assignee: Baker Hughes IncorporatedInventors: Stanislav W. Forgang, Randy Gold, Otto N. Fanini, Michael S. Crosskno, Tammye Crosskno, legal representative
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Patent number: 7898494Abstract: Location determination is performed using a transmitter including an elongated generally planar loop antenna defining an elongation axis. The elongation axis is positioned along at least a portion of a path. A magnetic field is then generated which approximates a dipole field. Certain characteristics of the magnetic field are then determined at a receiving position radially displaced from the antenna elongation axis. Using the determined certain characteristics, at least one orientation parameter is established which characterizes a positional relationship between the receiving position and the antenna on the path. The magnetic field may be transmitted as a monotone single phase signal. The orientation parameter may be a radial offset and/or an angular orientation between the receiving position and the antenna on the path. The antenna of the transmitter may be inserted into a first borehole to transmit the magnetic field to a receiver inserted into a second borehole.Type: GrantFiled: September 29, 2008Date of Patent: March 1, 2011Assignee: Merlin Technology, Inc.Inventors: Guenter W. Brune, John E. Mercer, Albert W. Chau, Rudolf Zeller
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Patent number: 7888940Abstract: A downhole induction resistivity assembly that comprises a downhole tool string component. The tool string component comprises an induction transmitter. The transmitter is adapted to induce an induction field in the surrounding formation. A first induction receiver is spaced apart from the transmitter and is adapted to measure the induction field. A magnetic field generating mechanism is disposed adjacent on either or both sides of the transmitter and adapted to guide the transmitter's signal into the formation. A second induction receiver is disposed in close proximity to the magnetic field generating mechanism and is adapted to measure the magnetic field generated by the mechanism.Type: GrantFiled: December 22, 2008Date of Patent: February 15, 2011Assignee: Schlumberger Technology CorporationInventors: David R. Hall, Paula Turner, Harold Synder, Clint Cook, Katie George
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Publication number: 20100321022Abstract: A resistivity array having a modular design includes a transmitter module with at least one antenna, wherein the transmitter module has connectors on both ends adapted to connect with other downhole tools; and a receiver module with at least one antenna, wherein the transmitter module has connectors on both ends adapted to connect with other downhole tools; and wherein the transmitter module and the receiver module are spaced apart on a drill string and separated by at least one downhole tool. Each transmitter and receiver module may comprise at least one antenna coil with a magnetic moment orientation not limited to the tool longitudinal direction. A spacing between the transmitter and receiver module may be selected based on expected reservoir thickness.Type: ApplicationFiled: July 27, 2010Publication date: December 23, 2010Inventors: Jean Seydoux, Emmanuel Legendre, Reza Taherian
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Patent number: 7852087Abstract: A method that involves developing an electromagnetic property model of a near surface area and using this electromagnetic property model and electromagnetic data acquired using one or more electromagnetic transmitters located above the near surface area and one or more electromagnetic receivers located within a wellbore to determine one or more electromagnetic properties of a subsurface area. Also an electromagnetic data acquisition system that includes one or more electromagnetic transmitters capable of being operated on the earth's surface, one or more first electromagnetic receivers capable of being operated within a wellbore and capable of receiving signals from the one or more electromagnetic transmitters, and one or more second electromagnetic receivers capable of being located on the earth's surface near the one or more electromagnetic transmitters and capable of receiving signals from the one or more electromagnetic transmitters. Related embodiments are also described.Type: GrantFiled: August 10, 2007Date of Patent: December 14, 2010Assignee: Schlumberger Technology CorporationInventors: Michael Wilt, Garrett Kramer
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Publication number: 20100308832Abstract: To determine effect on a magnetic field caused by a lining structure in a wellbore, an array may be deployed into the wellbore lined with the lining structure. The array comprises a plurality of sensors including sensor A configured to operate as a transmitter, sensor B configured to operate as either a transmitter or a receiver, and sensor C configured to operate as a receiver. The array measures magnetic fields using sensor B as a receiver and sensor C in response to activation of sensor B as a transmitter and sensor A. A plurality of lining structure correction factors can be calculated based on the measured magnetic fields, based on the reciprocity of the sensors.Type: ApplicationFiled: April 12, 2010Publication date: December 9, 2010Inventors: Brian Clark, Frank Morrison, Edward Nichols, Hong Zhang, Richard A. Rosthal
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Patent number: 7848887Abstract: A system and method to determine directional measurements for a drilling tool that at times rotates and at other times does not rotate. The method includes making a first set of measurements when the apparatus is rotating, making a second set of measurements when the apparatus is not rotating, and combining the first and second sets of measurements to obtain the directional measurements. The system includes a transmitter-receiver pair wherein the transmitter has a magnetic dipole moment parallel to a longitudinal axis of the apparatus and the receiver has a magnetic dipole moment that is tilted relative to the longitudinal axis of the apparatus, an electronics module to excite the transmitter and detect a receiver signal to make a first and second set of measurements when the apparatus is rotating and not rotating, and a processor to combine the first and second sets of measurements to obtain the directional measurements.Type: GrantFiled: March 1, 2007Date of Patent: December 7, 2010Assignee: Schlumberger Technology CorporationInventors: Jian Yang, Qiming Li
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Publication number: 20100305862Abstract: A compensated resistivity logging while drilling tool having axially asymmetrically spaced transmitters is configured to provide compensated resistivity measurements. In one exemplary embodiment, the tool includes first and second compensating transmitters, preferably deployed axially symmetrically between first and second spaced receivers. The tool further includes a plurality of transmitters deployed axially asymmetrically with respect to the receivers, e.g., on one axial side of the receivers. The compensating transmitters are configured to acquire a borehole compensation that may be subtracted from conventional phase and attenuation measurements.Type: ApplicationFiled: June 2, 2009Publication date: December 2, 2010Applicant: Smith International, Inc.Inventor: Jing Li
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Patent number: 7839148Abstract: A method and related system calibrating downhole tools for drift. Some of the illustrative embodiments are a logging tool comprising a tool body, a transmitter antenna associated with the tool body, a transmitter electronics coupled to the transmitter antenna, a first receiver antenna associated with the tool body, a first receiver electronics coupled to the first receiver antenna, and a signal generator separate from the first transmitter electronics, the signal generator coupled to the first receiver electronics, and the first signal generator provides a calibration signal to the first receiver electronics.Type: GrantFiled: April 3, 2006Date of Patent: November 23, 2010Assignee: Halliburton Energy Services, Inc.Inventors: Imran Vehra, James J. Freeman, Christopher A. Golla, Randal T. Beste, Michael S. Bittar
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Patent number: 7839346Abstract: The specification discloses a printed circuit board (PCB) based ferrite core antenna. The traces of PCBs form the windings for the antenna, and various layers of the PCB hold a ferrite core for the windings in place. The specification further discloses use of such PCB based ferrite core antennas in downhole electromagnetic wave resistivity tools such that azimuthally sensitivity resistivity readings may be taken, and borehole imaging can be performed, even in oil-based drilling fluids.Type: GrantFiled: October 4, 2005Date of Patent: November 23, 2010Assignee: Halliburton Energy Services, Inc.Inventors: Michael S. Bittar, Jesse K. Hensarling
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Patent number: 7834631Abstract: 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 the cable transmit a boring tool locating signal and a cable locating signal, respectively. Intensities of the boring tool locating signal and the cable locating signal are measured along with a pitch orientation of the boring tool. Using the measured intensities and established pitch orientation, a positional relationship is determined to relative scale including at least the boring tool and the cable in the region. The positional relationship is displayed to scale in one view. The positional relationship may be determined and displayed including the forward locate point in scaled relation to the boring tool and the cable. Cable depth determination techniques are described including a two-point ground depth determination method.Type: GrantFiled: July 31, 2009Date of Patent: November 16, 2010Assignee: Merlin Technologies Inc.Inventors: Guenter W. Brune, Albert W. Chau, John E. Mercer
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Publication number: 20100283470Abstract: A method for making directional resistivity measurements includes sequentially transmitting first and second axial and transverse electromagnetic waves in a borehole and receiving substantially pure axial and transverse components of each of the transmitted waves. A composite ratio of the received components is computed and may be utilized as an indicator of various formation parameters. The invention advantageously provides for the acquisition of compensated directional resistivity measurements.Type: ApplicationFiled: May 11, 2009Publication date: November 11, 2010Applicant: Smith International, Inc.Inventors: Christopher C. Streinz, Tsili Wang
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Publication number: 20100283469Abstract: One exemplary embodiment of a method for making directional resistivity measurements includes transmitting an axial electromagnetic wave in a borehole and receiving substantially pure axial and transverse components of the wave. A ratio of the axial and transverse components is computed and may be utilized as an indicator of various formation parameters. The invention advantageously enables the moment of the transmitting antenna to be canceled and therefore can result in improved accuracy.Type: ApplicationFiled: May 11, 2009Publication date: November 11, 2010Applicant: SMITH INTERNATIONAL, INC.Inventor: Tsili Wang
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Publication number: 20100277177Abstract: Methods and related systems are described for analyzing electromagnetic survey data. Electromagnetic survey data of a subterranean formation is obtained using at least a downhole transceiver deployed in a borehole and a transceiver positioned on the surface, or in the same or another borehole. Limits are defined for casing correction coefficients that account for effects of the borehole casing. A constrained inversion process is performed solving for the casing correction coefficients within the defined limits, and for one or more parameters of a model representing attributes, such as resistivity, of the subterranean formation.Type: ApplicationFiled: April 28, 2010Publication date: November 4, 2010Inventors: David L. Alumbaugh, Cyrille Levesque, Ping Zhang, Guozhong Gao
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Publication number: 20100271030Abstract: A transient electromagnetic borehole system uses an arrangement of sensors deployed in a borehole for reservoir monitoring. Non-conductive casing sections may be used along with an efficient transmitter configured to provide measurements up to 300 m from the borehole. By using multiple receivers, the method can also be used without nonconductive casing.Type: ApplicationFiled: April 13, 2010Publication date: October 28, 2010Applicant: Baker Hughes IncorporatedInventors: Arcady Reiderman, Larry G. Schoonover, Sushant M. Dutta, Michael B. Rabinovich
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Patent number: 7816921Abstract: The disclosure provides apparatus and method for estimating an electrical property downhole. The apparatus, in one aspect, includes an antenna that comprises a unitary metallic member that has a longitudinal axis and a radial axis, at least one slot made in the metallic member and an electrical conductor over the at least one slot to form an antenna. In one aspect, a high magnetic permeability material may be placed between the electrical conductor and a bottom of the slots. The antenna may be configured to operate as a transmitter for transmitting electromagnetic signals into a formation or a receiver for receiving electromagnetic signals from the formation.Type: GrantFiled: September 13, 2007Date of Patent: October 19, 2010Assignee: Baker Hughes IncorporatedInventors: Andreas Peter, Martin Blanz
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Patent number: 7812608Abstract: An electromagnetic logging tool is disclosed 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 receiver, and a trim coil. A method for balancing an induction array is disclosed that includes applying an alternating current to a transmitter of the induction array that comprises the transmitter, a bucking coil and a receiver; measuring a mutual coupling between the transmitter and the receiver; and adding an extra bucking coil, if the mutual coupling exceeds a selected criterion.Type: GrantFiled: September 18, 2009Date of Patent: October 12, 2010Assignee: Schlumberger Technology CorporationInventors: Andrei I. Davydychev, John F. Hunka, Thomas D. Barber, Scott S. Chesser, Bulent Finci, Jingjing Karen Sun, William B. Vandermeer, Richard D. Ward
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Patent number: 7812610Abstract: A wellbore tool for locating a target wellbore containing a conductive member from a second wellbore and directing the trajectory of the second wellbore relative to the target wellbore includes an electric current driver having an insulated gap; a three-axis magnetometer positioned within a non-magnetic housing that is disposed within a non-magnetic tubular, the three-axis magnetometer positioned below the electric current driver; a drill bit positioned below the three-axis magnetometer; a hollow tubular connected between the electric current driver and the three-axis magnetometer; and a measurement-while-drilling tool. The current driver generates an electric current across the gap to the portion of the tool below the insulated gap. In a method a current is generated across the insulated gap to the portion of the tool below the insulated gap to the conductive material in the target wellbore returning to a portion of the bottom hole assembly above the insulated gap thereby producing a target magnetic field.Type: GrantFiled: October 19, 2006Date of Patent: October 12, 2010Assignee: Schlumberger Technology CorporationInventors: Brian Clark, Christophe Dupuis, Gerald N. Minerbo
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Publication number: 20100244842Abstract: A directional resistivity tool includes at least one receiver deployed axially asymmetrically between at least one pair of transmitters. The transmitters are configured to transmit electromagnetic waves at first and second correspondingly distinct frequencies f1 and f2 such that: f1/f2=L2/L1, where L1 and L2 represent the corresponding axial distances between the first and second transmitters and the receiver. Exemplary embodiments of the invention further include a method for reducing the near-bed anisotropy effect. The anisotropy effect may be advantageously reduced (or removed) while at the same time providing for freedom in selecting the axial transmitter and receiver spacing.Type: ApplicationFiled: March 24, 2009Publication date: September 30, 2010Applicant: SMITH INTERNATIONAL, INC.Inventor: Tsili Wang
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Patent number: 7800372Abstract: In one aspect, an apparatus and a method for estimating one or more electrical properties downhole are provided. The apparatus, in one embodiment, may include a metallic member that has a longitudinal axis and a radial axis, at least two groups of slots formed in the metallic member, each group of slots having at lest two rows of slots, each row of slots containing at least one slot, and an electrical conductor placed over the at least two rows of slots at an angle to the radial axis of the metallic member to form an antenna of a tool for use in a wellbore for estimating the electrical properties downhole. The antenna may be configured to operate as a transmitter or as a receiver.Type: GrantFiled: September 13, 2007Date of Patent: September 21, 2010Assignee: Baker Hughes IncorporatedInventors: Andreas Peter, Martin Blanz
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Publication number: 20100231220Abstract: A drill string is disposed in the borehole having a BHA and a drill bit advancing the borehole. Among other BHA components, including a telemetry unit and a data acquisition unit, in a surface-to-borehole configuration a receiver (or receiver array) is positioned immediately proximate the drill bit in the borehole, while a source (or source array) is positioned at the Earth's surface. Alternatively, in a borehole-to-surface configuration the source may be positioned immediately proximate the drill bit in the borehole while a receiver (or receiver array) is positioned at the surface. The surface-to-borehole, or borehole-to-surface, system enables an electromagnetic look about while drilling operations are underway.Type: ApplicationFiled: March 8, 2010Publication date: September 16, 2010Inventors: David Alumbaugh, Edward Nichols, Cengiz Esmersoy
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Patent number: 7795872Abstract: To determine effect on a magnetic field caused by a lining structure in a wellbore, an array may be deployed into the wellbore lined with the lining structure. The array comprises a plurality of sensors including sensor A configured to operate as a transmitter, sensor B configured to operate as either a transmitter or a receiver, and sensor C configured to operate as a receiver. The array measures magnetic fields using sensor B as a receiver and sensor C in response to activation of sensor B as a transmitter and sensor A. A plurality of lining structure correction factors can be calculated based on the measured magnetic fields, based on the reciprocity of the sensors.Type: GrantFiled: October 5, 2007Date of Patent: September 14, 2010Assignee: Schlumberger Technology CorporationInventors: Brian Clark, Frank Morrison, Edward Nichols, Hong Zhang, Richard A. Rosthal
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Patent number: 7778778Abstract: 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. Multifrequency focusing is then applied to the corrected multifrequency data. An inversion is then used to recover formation resistivity and relative dip and azimuth of the borehole.Type: GrantFiled: July 30, 2007Date of Patent: August 17, 2010Assignee: Baker Hughes IncorporatedInventors: Alexandre N. Bespalov, Gulamabbas Merchant, Cynthia Dong Xue, Luis M. Pelegri, Michael B. Rabinovich, Stephen V. Painchaud, Bill H. Corley, Stanislav W. Forgang, Randy Gold
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Patent number: 7769572Abstract: This invention relates generally to a method of simulating the signal of an electromagnetic source using one or more dipole sources. In the method a dipole source is located at an excitation location corresponding to a segment of the electromagnetic source to be simulated. The dipole source is activated, and an electromagnetic signal recorded at one or more receiver locations. This process is repeated for additional excitation locations corresponding to additional segments of the electromagnetic source. The data from the sequence of dipole source excitation locations is processed to determine the simulated signal of the electromagnetic source.Type: GrantFiled: August 27, 2002Date of Patent: August 3, 2010Assignee: ExxonMobil Upstream Research Co.Inventors: Leonard J. Srnka, James J. Carazzone
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Publication number: 20100191469Abstract: A method for estimating a property of an earth formation in a zone of investigation, the earth formation having the zone of investigation and another zone, the method including: applying a compound pulse of electromagnetic energy to the earth formation, the compound pulse having a shape to induce a predominately greater amount of current in the zone of investigation than in the another zone, wherein the compound pulse includes a first pulse and a second pulse, the first pulse having an amplitude different from the amplitude of the second pulse; receiving a response of electromagnetic energy from the current induced by the compound pulse; and estimating the property from the response of electromagnetic energy.Type: ApplicationFiled: October 12, 2009Publication date: July 29, 2010Applicant: BAKER HUGHES INCORPORATEDInventor: Vladimir S. Mogilatov
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Patent number: 7765067Abstract: 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 earth formation are determined. The results are used for reservoir navigation in an earth formation.Type: GrantFiled: May 7, 2007Date of Patent: July 27, 2010Assignee: Baker Hughes IncorporatedInventors: Leonty A. Tabarovsky, Michael B. Rabinovich
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Publication number: 20100180662Abstract: Example composite materials and calibration assemblies using the same. An example calibration assembly for use in calibrating a downhole formation evaluation tool includes a first body comprising a first material and having a first geometry, a second body comprising a second material formed to receive the first body, wherein the first and second materials and the first geometry are selected so that a calibration property of the calibration assembly substantially matches a corresponding calibration property of a third material.Type: ApplicationFiled: October 22, 2009Publication date: July 22, 2010Inventors: Richard J. Radtke, Christopher Scott Del Campo, Dale Wayne Clinton, Qingyan He, Augdon John Sampa
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Patent number: 7759940Abstract: In a multicomponent logging tool, a coil is electrically isolated by open circuiting another, substantially orthogonal coil.Type: GrantFiled: April 4, 2007Date of Patent: July 20, 2010Assignee: Baker Hughes IncorporatedInventors: Stanislav W. Forgang, Randy Gold, Luis M. Pelegri
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Publication number: 20100179762Abstract: An apparatus having transmitter and receiver antennas is provided for measuring conductivity of an earth formation surrounding a borehole. The apparatus utilizes an initial model to invert induction measurements of the earth formation to provide a conductivity model that includes a plurality of coaxial cylinders.Type: ApplicationFiled: January 12, 2009Publication date: July 15, 2010Applicant: Baker Hughes IncorporatedInventors: Leonty A. Tabarovsky, Michael S. Zhdanov, Mikhail I. Epov
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Patent number: 7746076Abstract: A method for using a tool in a wellbore in a formation to predict an anomaly in the formation ahead of the device, the tool comprising a transmitter for transmitting electromagnetic signals through the formation and a receiver for detecting response signals. the method comprises a) bringing the tool to a first position inside the wellbore; b) energizing the transmitter to propagate a transient electromagnetic signal into the formation; c) detecting a response signal that has propagated through the formation as a result of the transient signal in step (b); d) calculating a derived quantity for the formation as a function of time based on the detected response signal for the formation; e) plotting the derived quantity for the formation against time; f) moving the tool to at least one other position within the wellbore and repeating steps (b) to (e); g) predicting an anomaly in the formation.Type: GrantFiled: June 2, 2009Date of Patent: June 29, 2010Assignee: Shell Oil CompanyInventors: Richard Martin Ostermeier, Teruhiko Hagiwara, Erik Jan Banning
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Patent number: 7742008Abstract: A multipole antenna for conducting logging-while-drilling (LWD), includes a wire for one of producing and receiving an electromagnetic field, the wire having at least one winding for providing a magnetic moment in a first portion of the antenna that is opposite to the magnetic moment of a second portion of the antenna. A method for constructing the multipole antenna is provided. A LWD tool making use of the antenna is also provided.Type: GrantFiled: October 24, 2007Date of Patent: June 22, 2010Assignee: Baker Hughes IncorporatedInventors: Tsili Wang, Jack Signorelli
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Publication number: 20100148785Abstract: An apparatus for evaluating downhole fluids is disclosed. The apparatus includes: an optical block having an adjustable opening that receives electromagnetic energy emitted by an electromagnetic energy source; a controller operatively associated with the optical block for adjusting the opening size, wherein the opening size is adjusted at least in part based on one or more estimated downhole parameters; and a sensor that receives the electromagnetic energy emitted by the electromagnetic energy source after the emitted electromagnetic energy interacts with a downhole fluid. A method for evaluating downhole fluids is also disclosed.Type: ApplicationFiled: December 12, 2008Publication date: June 17, 2010Applicant: BAKER HUGHES INCORPORATEDInventors: Peter Schaefer, Tobias Kischkat
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Patent number: 7737697Abstract: 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 and another subset of the multi-component measurements, the vertical resistivities are obtained. Results of using the in-phase signals are comparable to those obtained using multifrequency focusing of quadrature signals.Type: GrantFiled: January 15, 2008Date of Patent: June 15, 2010Assignee: Baker Hughes IncorporatedInventors: Liming Yu, Berthold Kriegshäuser
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Publication number: 20100134111Abstract: A transient electromagnetic wave is generated using an electromagnetic instrument in a borehole. An apparent resistivity is estimated using a received signal responsive to the generated wave and further used to estimate a resistivity property of a fluid in the borehole.Type: ApplicationFiled: December 1, 2008Publication date: June 3, 2010Applicant: BAKER HUGHES INCORPORATEDInventor: Gregory B. Itskovich
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Patent number: 7723991Abstract: A combination of a shallow-reading and a deep-reading, azimuthally sensitive, multiple propagation devices is used for providing depth images the earth formation with different depth of investigation. It is emphasized that this abstract is provided to comply with the rules requiring an abstract which will allow a searcher or other reader to quickly ascertain the subject matter of the technical disclosure. It is submitted with the understanding that it will not be used to interpret or limit the scope or meaning of the claims.Type: GrantFiled: October 2, 2007Date of Patent: May 25, 2010Assignee: Baker Hughes IncorporatedInventors: Jack Signorelli, Tsili Wang, Roland E. Chemali
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Patent number: 7723989Abstract: Transducer apparatus for subsurface use. A tubular configured for subsurface disposal is equipped with a cylindrical transducer module formed of a non-conductive material. The module is mounted to surround a section of the tubular and includes a transducer element disposed thereon such that only a surface of the element is exposed along the exterior of the module body. The transducer element is linked to a lead routed through the cylindrical body to exit near the inner bore of the body. The ends of the cylindrical body are covered with a material to form a hydraulic seal. A method for constructing the transducer apparatus.Type: GrantFiled: September 18, 2007Date of Patent: May 25, 2010Assignee: Schlumberger Technology CorporationInventors: Qingyan He, Chris Del Campo, Richard Dan Ward
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Patent number: 7719282Abstract: An improved induction tool for evaluating formation resistivity. 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 susceptibility to errors associated with parasitic eddy currents induced in the metal components surrounding the transmitter and receiver coils. A magnetic lens is provided to select sensitivity to a desired reservoir formation property.Type: GrantFiled: July 19, 2007Date of Patent: May 18, 2010Assignee: Baker Hughes IncorporatedInventors: Otto N. Fanini, Stanislav W. Forgang, Berthold Kriegshauser, Liming Yu
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Patent number: 7714585Abstract: Measurements made with an induction logging tool are responsive to formation conductivity and permittivity. The effect of permittivity can be substantially removed by multifrequency focusing.Type: GrantFiled: March 21, 2007Date of Patent: May 11, 2010Assignee: Baker Hughes IncorporatedInventors: Marina N. Nikitenko, Leonty A. Tabarovsky