Using A Pad Member Patents (Class 324/367)
  • Patent number: 10927672
    Abstract: A system includes an optical computing device having an optical multiplexer that receives a sample light generated by an optical interaction between a sample and an illumination light is provided. The system includes sensing elements that optically interact with the sample light to generate modified lights, and a detector that measures a property of the modified lights separately. Linear and nonlinear models for processing data collected with the above system to form high-resolution spectra are also provided. Methods for designing optimal optical multiplexers for optimal reconstruction of high-resolution spectra are also provided.
    Type: Grant
    Filed: August 13, 2019
    Date of Patent: February 23, 2021
    Assignee: Halliburton Energy Services, Inc.
    Inventors: Bin Dai, Christopher Michael Jones, Dingding Chen, Jing Shen
  • Patent number: 10605582
    Abstract: A tool for evaluating the internal surfaces of tubular is provided, wherein one or more arms extend outwardly from the tool to contact an inner wall surface of the tubular, and changes in the dimensions or condition of the inner wall result in changes in the position of the ends of the arms relative to the tool. This motion is converted, through an electromagnetic transducer. The probe arms extending from the tool are releasably held in bores formed by opposed members on the tool, within which the probe arms may pivot. The internal end of the probe arms need not be physically secured to an internal element of the tool, yet still enable motion of an internal components to actuate a transducer to provide electrical signals indicative of the tip of the probe arm relative to the tool as the tool traverses a tubular, such as a wellbore casing.
    Type: Grant
    Filed: April 29, 2016
    Date of Patent: March 31, 2020
    Assignee: PROBE HOLDINGS, INC.
    Inventors: Herve Ohmer, Monty D. Mayfield
  • Patent number: 10132954
    Abstract: According to aspects of the present disclosure, an example downhole tool may include tool body, a first pad radially extendable from the tool body, and a radial array of conformable sensors coupled to the first pad. At least one conformable sensor of the radial array of conformable sensors may include a first flexible material. A transmitter may be coupled to one of the tool body and the first flexible material, and a receiver may be coupled to one of the tool body and the first flexible material. At least one of the transmitter and the receiver may be coupled to the first flexible material.
    Type: Grant
    Filed: March 22, 2017
    Date of Patent: November 20, 2018
    Assignee: Halliburton Energy Services, Inc.
    Inventor: Burkay Donderici
  • Patent number: 9664812
    Abstract: A method of quantifying borehole properties, comprising: injecting an electric current from an outer button and an inner button disposed on an equipotential pad into a subterranean formation surround by the borehole, measuring an apparent conductivity or a scaled current for each button, modeling the measurements at a sequence of standoff locations, and, using an inversion technique to determine at least one of the following borehole properties: mudcake thickness, mudcake resistivity, diameter of invasion, flushed zone resistivity and true formation resistivity.
    Type: Grant
    Filed: April 15, 2013
    Date of Patent: May 30, 2017
    Assignee: Weatherford Technology Holdings, LLC
    Inventor: David Guoyu Hu
  • Patent number: 9581719
    Abstract: An oil-based mud formation imaging tool for measuring electrical properties of surrounding formation includes at least one base plate, a first port and a second port deployed on the base plate, surface conductors covering both sides of the base plate, and inside conductors deployed in the first port and the second ports and with gaps from the edges of the first and second ports. The first port is fed with electromagnetic signals by a waveguide and a coupling is formed between the imaging tool and the surrounding formation accordingly. Resonance signals are induced at the second port to be used to compute corresponding formation resistivity and dielectric constant. A corresponding imaging method is also provided.
    Type: Grant
    Filed: July 5, 2013
    Date of Patent: February 28, 2017
    Assignee: Bitswave, Inc.
    Inventors: Yue Liu, Qingjie Bai, Qihui Zhao, Yuzhou Lu, Tao Huang, Zhong Wang, Suming Wu, Ce Liu
  • Patent number: 9568636
    Abstract: A method, a system, and an apparatus are described for the data acquisition in the well-logging of a borehole wall during the investigation of formation properties. Data acquisition is conducted by either an adaptive phase compensation processing or a modulus mode processing, both of which use in-phase and out-of-phase current components to obtain current values. Adaptive phase compensation employs a calculation of a phase shift compensation value, which may then be applied to subsequent acquisitions and can be further processed in the generation of an image of the borehole wall.
    Type: Grant
    Filed: March 17, 2014
    Date of Patent: February 14, 2017
    Assignee: SCHLUMBERGER TECHNOLOGY CORPORATION
    Inventor: Philip S. Cheung
  • Patent number: 8866483
    Abstract: Various disclosed resistivity imaging tools and methods provide a high-resolution electrode configuration for imaging in oil-based imaging in oil-based muds. Some tool embodiments have a sensing surface that comprises: a measurement electrode, a focus electrode surrounding the measurement electrode, and a return electrode surrounding the focus electrode. The sensing surface can be provided on an extendable sensor pad or on the wall-contacting portion of a stabilizer. Some method embodiments include measuring the measurement electrode current while driving a voltage signal between the measurement electrode and the return electrode. The voltage signal may simultaneously or sequentially provide energy at different frequencies. The resistivity measurements are combined with tool position and orientation measurements to form a borehole wall image.
    Type: Grant
    Filed: April 8, 2008
    Date of Patent: October 21, 2014
    Assignee: Halliburton Energy Services, Inc.
    Inventors: Michael Bittar, Guoyu Hu, Glenn Smollinger
  • Publication number: 20140306711
    Abstract: A method of quantifying borehole properties, comprising: injecting an electric current from an outer button and an inner button disposed on an equipotential pad into a subterranean formation surround by the borehole, measuring an apparent conductivity or a scaled current for each button, modeling the measurements at a sequence of standoff locations, and, using an inversion technique to determine at least one of the following borehole properties: mudcake thickness, mudcake resistivity, diameter of invasion, flushed zone resistivity and true formation resistivity.
    Type: Application
    Filed: April 15, 2013
    Publication date: October 16, 2014
    Applicant: Weatherford/Lamb, Inc.
    Inventor: David Guoyu Hu
  • Patent number: 8823379
    Abstract: The invention relates to a logging tool (1) for determining properties of a fluid (2) surrounding the tool arranged downhole in a casing (3) comprising a wall (4) and having a longitudinal extension. The logging tool has a substantially longitudinal cylindrical shape with a longitudinal axis and, when seen in cross-section, a periphery (5). Moreover, the logging tool comprises a plurality of electrodes (6) arranged spaced around the longitudinal axis in the periphery of the tool so that the fluid flows between the electrodes and the casing wall and a means for measuring the capacitance between two electrodes in all possible combinations giving n*(n?1)/2 capacitance measurements for n electrodes.
    Type: Grant
    Filed: October 30, 2009
    Date of Patent: September 2, 2014
    Assignee: Welltec A/S
    Inventors: Jørgen Hallundbaek, Jimmy Kjaersgaard-Rasmussen
  • Patent number: 8773135
    Abstract: A device, method and system for measuring characteristics of a geologic formation using a floating reference signal having a mud chamber, an electrode disposed within the mud chamber, and an electrically conductive plate disposed within the mud chamber, the plate separated from the electrode. An alternating current source is provided on the electrode, whereby an electric field is be maintained between the electrode and the conductive plate. An opening in the mud chamber allows drilling fluids to pass there through.
    Type: Grant
    Filed: November 30, 2011
    Date of Patent: July 8, 2014
    Assignee: Baker Hughes Incorporated
    Inventor: Leonty A. Tabarovsky
  • Patent number: 8718942
    Abstract: A method, a system, and an apparatus are described for the data acquisition in the well-logging of a borehole wall during the investigation of formation properties. Data acquisition is conducted by either an adaptive phase compensation processing or a modulus mode processing, both of which use in-phase and out-of-phase current components to obtain current values. Adaptive phase compensation employs a calculation of a phase shift compensation value, which may then be applied to subsequent acquisitions and can be further processed in the generation of an image of the borehole wall.
    Type: Grant
    Filed: May 6, 2011
    Date of Patent: May 6, 2014
    Assignee: Schlumberger Technology Corporation
    Inventor: Philip S. Cheung
  • Patent number: 8710846
    Abstract: A probe for measuring electromagnetic properties of a subsurface formation includes a pad having a face adapted for engagement with a borehole wall, a pair of transmitting antennas, and two pairs of receiving antennas. The transmitting antennas and receiving antennas are mounted in the face of the pad, and each of the two pairs of receiving antennas include a first and second antenna distributed on opposite sides of the pair of transmitting antennas. The probe further includes an electronic arrangement having a transmitter module and a receiver module. The transmitter module is arranged to operate the pair of transmitting antennas in either a broadside mode or an endfire mode by applying an excitation signal modulated by two or more frequencies, and the receiver module is arranged to determine an attenuation and a phase shift of each reception signal provided by each receiving antenna relatively to the excitation signal.
    Type: Grant
    Filed: January 8, 2012
    Date of Patent: April 29, 2014
    Assignee: Schlumberger Technology Corporation
    Inventors: Matthieu Simon, Henri Budan, Laurent Mosse, Mehdi Hizem
  • Publication number: 20140111212
    Abstract: An apparatus for providing an image of a resistivity property of an earth formation surrounding a borehole is provided. The apparatus, in one aspect, may include a plurality of measure electrodes that are configured to convey an electrical current into the earth formation. In one aspect, each measure electrode may be substantially surrounded by an associated insulator that extends away from a tool body in a manner that blocks at least a portion of a vertical current flowing in a conductive fluid when the tool is operated to log the borehole. A processor provides an image of the resistivity property of the earth formation using the current in plurality of measure electrodes.
    Type: Application
    Filed: December 30, 2013
    Publication date: April 24, 2014
    Applicant: Baker Hughes Incorporated
    Inventors: RANDY GOLD, Stanislav W. Forgang, Dinesh P. Shah
  • Patent number: 8629678
    Abstract: An apparatus for providing an image of a resistivity property of an earth formation surrounding a borehole is provided. The apparatus, in one aspect, may include a plurality of measure electrodes that are configured to convey an electrical current into the earth formation. In one aspect, each measure electrode may be substantially surrounded by an associated insulator that extends away from a tool body in a manner that blocks at least a portion of a vertical current flowing in a conductive fluid when the tool is operated to log the borehole. A processor provides an image of the resistivity property of the earth formation using the current in plurality of measure electrodes.
    Type: Grant
    Filed: September 3, 2008
    Date of Patent: January 14, 2014
    Assignee: Baker Hughes Incorporated
    Inventors: Randy Gold, Stanislav W. Forgang, Dinesh P. Shah
  • Patent number: 8446150
    Abstract: An apparatus for logging in a borehole comprises a longitudinal body. A pad is coupled to and radially extendable from the longitudinal body toward a wall of the borehole. The radially extendable pad comprises a sensor. The radially extendable pad is rotatable about a longitudinal axis by a predetermined angle. A method for logging a borehole comprises extending a longitudinal body into the borehole; disposing a sensor in a radially extendable pad; coupling the radially extendable pad to the longitudinal body such that the radially extendable pad is rotatable about a longitudinal axis by a predetermined angle; and extending the radially extendable and rotatable pad toward a wall of the borehole.
    Type: Grant
    Filed: June 6, 2008
    Date of Patent: May 21, 2013
    Assignee: Halliburton Energy Services, Inc.
    Inventor: Luis E. Mera
  • Patent number: 8390295
    Abstract: A system for measuring a resistivity parameter of an earth formation includes: at least one measurement electrode electrically connected to a first electrical source; at least one guard electrode; a shielding electrode interposed between the at least one guard electrode and the at least one measurement electrode, the shielding electrode being electrically connected to a second electrical source independent from the first electrical source, and the guard electrode being electrically connected to a third electrical source independent of the first and second electrical sources; at least one return electrode; insulators positioned between (i) the measurement electrode and the shielding electrode, (ii) the shielding electrode and the guard electrode and (iii) the measurement electrode, the guard electrode and the return electrode; and a processor configured to adjust at least one of the first electrical source and the second electrical source to minimize a current flow through the shielding electrode.
    Type: Grant
    Filed: July 11, 2008
    Date of Patent: March 5, 2013
    Assignee: Baker Hughes Incorporated
    Inventors: Matthias Gorek, Martin Folberth, Christian Fulda
  • Patent number: 8302687
    Abstract: Earth formations are characterized by using an array of electrodes which can measure streaming potentials in the formation, and by interpreting the data obtained by the electrodes. The electrodes are placed on a wireline tool, a LWD tool, or in a fixed manner about a completed wellbore. The measured streaming potentials are generated by drilling with an overbearing pressure, slitting the mudcake in a borehole, acid injection, or any of various other manners which causes fluid movement. The data obtained is interpreted to locate fractures, measure formation permeability, estimate formation pressure, monitor drilling fluid loss, detect abnormal pressure, etc. Particularly, a streaming potential voltage transient having a double peak profile signifies the presence of a formation fracture.
    Type: Grant
    Filed: March 10, 2009
    Date of Patent: November 6, 2012
    Assignee: Schlumberger Technology Corporation
    Inventors: Min-Yi Chen, Bhavani Raghuraman, Ian Bryant, Michael G. Supp, Jose Navarro
  • Patent number: 8299797
    Abstract: A method and apparatus for evaluating an earth formation penetrated by a borehole comprises taking resistivity measurements using a plurality of resistivity arrays or pads positioned within the borehole proximal the borehole wall. In one embodiment, pads are spaced apart azimuthally around the perimeter of a tool body, each pad carrying at least one electrode thereon. A sequence of resistivity measurement operations are performed involving sequentially operating each pad, in turn, as a transmitter, with remaining pads and electrodes operated as return electrodes. The sequence preferably involves a succession of adjacent pads around the perimeter of the tool body, resulting in a full rotational (360°) imaging of the formation penetrated by the borehole. In one embodiment, the pads include at least two electrodes spaced vertically apart from one another, such that helical current paths are defined between transmitting electrodes and return electrodes.
    Type: Grant
    Filed: July 30, 2009
    Date of Patent: October 30, 2012
    Assignee: Baker Hughes Incorporated
    Inventors: Stanislav Wilhelm Forgang, Randy Gold
  • Patent number: 8299796
    Abstract: An apparatus and method for performing high transverse resolution voltage measurements in downhole logging tools utilized to determine the resistivity of an adjacent portion of a borehole wall. Two current electrodes 508 and 509 are energized by an excitation source to create an oscillatory electric field in a borehole wall. The voltage drop from each voltage electrode in a row of laterally spaced voltage electrodes 604 is measured relative to a shared voltage electrode 606 longitudinally spaced from the row of electrodes. The differential voltage is used in combination with a measured current flow to determine a resistivity value for the borehole. A second row of laterally spaced voltage electrodes 608 having electrodes laterally offset from the electrodes of the first row is included to provide high transverse resolution. A common mode voltage at the shared voltage electrodes is measured and utilized to minimize the resistivity measurement error.
    Type: Grant
    Filed: May 21, 2007
    Date of Patent: October 30, 2012
    Assignee: Halliburton Energy Services, Inc.
    Inventors: Luis E. San Martin, Evan L. Davies
  • Patent number: 8237446
    Abstract: An imaging tool made includes a pad whose curvature is chosen based on the expected range of borehole radius and the pad size so as to maintain the maximum standoff below a desired value. The curvature may be adjusted using fasteners.
    Type: Grant
    Filed: August 27, 2008
    Date of Patent: August 7, 2012
    Assignee: Baker Hughes Incorporated
    Inventors: Stanislav W. Forgang, Randy Gold, Peter J. Nolan, Carlos A. Yanzig
  • Patent number: 8232803
    Abstract: A tool 1 is used in electrical investigation of geological formations GF surrounding a borehole BH. The tool 1 is comprised in a string of tools TS. The tool 1 comprises a current injection section CIS and a current return section CRS. The string of tools TS comprises at least one other section OS1. The current injection section CIS is electrically decoupled from the current return section CRS. The current injection section CIS is electrically decoupled from the at least one other section OS1 when the current injection section CIS and the at least one other section OS1 are adjacent to each other. The current return section CRS is electrically decoupled from the at least one other section OS1 when the current return section CRS and the at least one other section OS1 are adjacent to each other.
    Type: Grant
    Filed: December 10, 2007
    Date of Patent: July 31, 2012
    Assignee: Schlumberger Technology Corporation
    Inventor: Richard Bloemenkamp
  • Patent number: 8203344
    Abstract: An apparatus, method and computer-readable medium for evaluating an earth formation are disclosed. The apparatus includes at least one coil on a logging tool conveyed in a borehole in the earth formation. Passage of a current through the coil induces an electrical current in the earth formation. At least two electrodes associated with the logging tool and in proximity to a wall of the borehole have a potential difference in response to the induced electrical current that is indicative of a property of the earth formation. The at least one coil may be mounted on a mandrel of a downhole assembly. The electrodes may be positioned on a first pad extendable from a mandrel of the downhole assembly.
    Type: Grant
    Filed: September 14, 2006
    Date of Patent: June 19, 2012
    Assignee: Baker Hughes Incorporated
    Inventors: Randy Gold, Rashid W. Khokhar, Alexandre N. Bespalov, Leonty A. Tabarovsky, Gregory B. Itskovich
  • Patent number: 8098071
    Abstract: A device, method and system for measuring characteristics of a geologic formation using a floating reference signal having a mud chamber, an electrode disposed within the mud chamber, and an electrically conductive plate disposed within the mud chamber, the plate separated from the electrode. An alternating current source is provided on the electrode, whereby an electric field is be maintained between the electrode and the conductive plate. An opening in the mud chamber allows drilling fluids to pass there through.
    Type: Grant
    Filed: August 29, 2008
    Date of Patent: January 17, 2012
    Assignee: Baker Hughes Incorporated
    Inventor: Leonty A. Tabarovsky
  • Patent number: 8030938
    Abstract: An apparatus for imaging a subsurface material traversed by a borehole, the apparatus including an imaging pad deployed by a logging instrument, the pad including a plurality of measuring sets, each measuring set including a first current injector electrode, a second current injector electrode, a pair of sensor electrodes disposed between the first current injector electrode and the second current injector electrode, and an output for coupling to an electronics unit adapted for producing the imaging of the subsurface material.
    Type: Grant
    Filed: March 26, 2008
    Date of Patent: October 4, 2011
    Assignee: Baker Hughes Incorporated
    Inventors: Alexandre N. Bespalov, David R. Beard, Randy Gold, Gregory B. Itskovich, Tsili Wang
  • Patent number: 7899622
    Abstract: A method and instrument provide a very detailed symmetric resistivity image of a formation. A first asymmetric resistivity image is collected from a first arrangement of electrodes, which form an asymmetric sensor. A second asymmetric resistivity image is collected from a second arrangement of electrodes, which form an asymmetric sensor. The first image and the second image overlap each other. The images are assembled about a selected reference point and then processed to provide the very detailed symmetric resistivity image.
    Type: Grant
    Filed: September 2, 2008
    Date of Patent: March 1, 2011
    Assignee: Baker Hughes Incorporated
    Inventor: Tsili Wang
  • Publication number: 20110025336
    Abstract: A method and apparatus for evaluating an earth formation penetrated by a borehole comprises taking resistivity measurements using a plurality of resistivity arrays or pads positioned within the borehole proximal the borehole wall. In one embodiment, pads are spaced apart azimuthally around the perimeter of a tool body, each pad carrying at least one electrode thereon. A sequence of resistivity measurement operations are performed involving sequentially operating each pad, in turn, as a transmitter, with remaining pads and electrodes operated as return electrodes. The sequence preferably involves a succession of adjacent pads around the perimeter of the tool body, resulting in a full rotational (360°) imaging of the formation penetrated by the borehole. In one embodiment, the pads include at least two electrodes spaced vertically apart from one another, such that helical current paths are defined between transmitting electrodes and return electrodes.
    Type: Application
    Filed: July 30, 2009
    Publication date: February 3, 2011
    Inventors: Stanislav Wilhelm Forgang, Randy Gold
  • Patent number: 7876102
    Abstract: A mixed mode tool uses an inductive source and detects galvanic currents and/or potentials at electrodes in proximity to a borehole wall to produce a resistivity image of the earth formation. Alternative, the magnetic field produced by a galvanic current is detected by an antenna coil and used to produce a resistivity image.
    Type: Grant
    Filed: September 10, 2007
    Date of Patent: January 25, 2011
    Assignee: Baker Hughes Incorporated
    Inventors: Randy Gold, Rashid W. Khokhar, Alexandre N. Bespalov, Leonty A. Tabarovsky, Gregory B. Itskovich
  • Patent number: 7855560
    Abstract: A method and system for measuring formation resisitivity is achieved by introducing an electrical signal into the formation. The current of the introduced electrical signal is then sensed, producing an analog voltage signal as a measurement of the formation. The introduced electrical signal is compared with the measured signal of the formation. The comparison is made in a quadrature demodulation device, producing an in-phase demodulated signal. A quasi-direct-current signal is extracted from the in-phase demodulated signal, producing an analog measurement related to the resistivity of the formation.
    Type: Grant
    Filed: June 30, 2008
    Date of Patent: December 21, 2010
    Assignee: Baker Hughes Incorporated
    Inventors: Jinsong Zhao, Stanislav Forgang
  • Publication number: 20100097068
    Abstract: A logging tool for performing resistivity measurements on the sidewall of a borehole in an earth formation is provided with a circumferential series of evenly-spaced measurement electrodes providing complete circumferential coverage of resistivity measurements. In one embodiment, the measurement electrodes are carried on a conductive pad circumferentially surrounding an elongate mandrel or tubular. The conductive pad is held at a voltage adapted to focus measurement current into the sidewall of the borehole. Preferably, the pad has dimensions relative to the measurement electrodes and a standoff distance between the measurement electrodes and said borehole wall to effectively focus the measurement current into the borehole wall. In accordance with one aspect of the invention, the measurement electrodes are spaced apart by a distance that is less than the width of each measurement electrode, thereby ensuring full circumferential resolution.
    Type: Application
    Filed: October 17, 2008
    Publication date: April 22, 2010
    Inventors: Gregory B. Itskovich, Alexandre N. Bespalov, Farhat A. Shaikh, Peter John Nolan
  • Patent number: 7696757
    Abstract: Measurements made by a four terminal resistivity imaging tool in a borehole using a voltage measurement device with two different input impedances. From the two measurements, formation resistivity is determined with minimal sensitivity to standoff.
    Type: Grant
    Filed: June 7, 2007
    Date of Patent: April 13, 2010
    Assignee: Baker Hughes Incorporated
    Inventors: Gregory B. Itskovich, Alexandre N. Bespalov
  • Patent number: 7689363
    Abstract: A resistivity imaging apparatus includes: a first sensor electrode disposed on an electrode pad and positioned at a first standoff; a second sensor electrode disposed on the electrode pad and adjacent the first sensor electrode, the second sensor electrode positioned at a second standoff; and a return electrode disposed on the electrode pad, wherein the sensor electrodes and the return electrode are configured for injecting current into a formation and receiving a signal from the formation. Other embodiments, methods and computer program products are disclosed.
    Type: Grant
    Filed: May 15, 2007
    Date of Patent: March 30, 2010
    Assignee: Baker Hughes Incorporated
    Inventors: Gregory B. Itskovich, Stanislav Wilhelm Forgang, Alexandre N. Bespalov
  • Patent number: 7679368
    Abstract: A galvanic resistivity tool with one or more measurement electrodes and guard electrodes, and one or more shielding electrodes. The impedance seen by the measurement electrode (indicative of the formation resistivity) is determined by using a directional coupler that measures a reflection coefficient of an electrical signal.
    Type: Grant
    Filed: July 31, 2006
    Date of Patent: March 16, 2010
    Assignee: Baker Hughes Incorporated
    Inventor: Martin Folberth
  • Publication number: 20100052687
    Abstract: An imaging tool made includes a pad whose curvature is chosen based on the expected range of borehole radius and the pad size so as to maintain the maximum standoff below a desired value. The curvature may be adjusted using fasteners.
    Type: Application
    Filed: August 27, 2008
    Publication date: March 4, 2010
    Applicant: Baker Hughes Incorporated
    Inventors: Stanislav W. Forgang, Randy Gold, Peter J. Nolan, Carlos A. Yanzig
  • Publication number: 20100013487
    Abstract: A tool 1 is used in electrical investigation of geological formations GF surrounding a borehole BH. The tool 1 is comprised in a string of tools TS. The tool 1 comprises a current injection section CIS and a current return section CRS. The string of tools TS comprises at least one other section OS1. The current injection section CIS is electrically decoupled from the current return section CRS. The current injection section CIS is electrically decoupled from the at least one other section OS1 when the current injection section CIS and the at least one other section OS1 are adjacent to each other. The current return section CRS is electrically decoupled from the at least one other section OS1 when the current return section CRS and the at least one other section OS1 are adjacent to each other.
    Type: Application
    Filed: December 10, 2007
    Publication date: January 21, 2010
    Inventor: Richard Bloemenkamp
  • Patent number: 7616001
    Abstract: A resistivity imaging tool is used in a borehole having a conductive fluid. Second differences between axially spaced apart electrodes are used in the imaging. A calibration compensates for the effects of borehole rugosity.
    Type: Grant
    Filed: August 30, 2005
    Date of Patent: November 10, 2009
    Assignee: Baker Hughes Incorporated
    Inventor: Gregory B. Itskovich
  • Patent number: 7612567
    Abstract: A resistivity imaging device injects currents in two orthogonal directions using two pairs of return electrodes and performing impedance measurements of the buttons placed between the returns.
    Type: Grant
    Filed: April 28, 2008
    Date of Patent: November 3, 2009
    Assignee: Baker Hughes Incorporated
    Inventors: Gregory B. Itskovich, Randy Gold, Alexandre N. Bespalov, Stanislav W. Forgang
  • Patent number: 7609066
    Abstract: A method for measuring anisotropy in thin-bed formations calls for placing a logging tool into a borehole in the formation and applying current to at least one set of injection electrodes and at least one set of return electrodes to measure resistivity in the formation. Resistivity measurements are used to determine aspects of thin-bed formations exposed in the borehole to the tool. The aspects include the formation azimuth angle (?) and the formation dip angle (?). Typically, the measurements and determinations are completed using apparatus including a computer program product.
    Type: Grant
    Filed: March 8, 2007
    Date of Patent: October 27, 2009
    Assignee: Baker Hughes Incorporated
    Inventor: Tsili Wang
  • Patent number: 7545145
    Abstract: An unfocused resistivity imaging device horizontal and vertical currents conveyed into the borehole. Pad mounted electrodes are used to make voltage measurements in orthogonal directions. The voltage measurements are then rotated to give principal resistivity measurements in an anisotropic formation with dipping beds.
    Type: Grant
    Filed: May 3, 2006
    Date of Patent: June 9, 2009
    Assignee: Baker Hughes Incorporated
    Inventor: Tsili Wang
  • Publication number: 20080303526
    Abstract: Measurements made by a four terminal resistivity imaging tool in a borehole using a voltage measurement device with two different input impedances. From the two measurements, formation resistivity is determined with minimal sensitivity to standoff. 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: Application
    Filed: June 7, 2007
    Publication date: December 11, 2008
    Applicant: BAKER HUGHES INCORPORATED
    Inventors: Gregory B. Itskovich, Alexandre N. Bespalov
  • Publication number: 20080288171
    Abstract: A resistivity imaging apparatus includes: a first sensor electrode disposed on an electrode pad and positioned at a first standoff; a second sensor electrode disposed on the electrode pad and adjacent the first sensor electrode, the second sensor electrode positioned at a second standoff; and a return electrode disposed on the electrode pad, wherein the sensor electrodes and the return electrode are configured for injecting current into a formation and receiving a signal from the formation. Other embodiments, methods and computer program products are disclosed.
    Type: Application
    Filed: May 15, 2007
    Publication date: November 20, 2008
    Applicant: BAKER HUGHES INCORPORATED
    Inventors: Gregory B. Itskovich, Stanislav Wilhelm Forgang, Alexandre N. Bespalov
  • Patent number: 7443168
    Abstract: A compact magnetic sensor is described that is capable of use in pad-mounted applications and field-focusing applications. A downhole induction tool is described with a compact induction sensor having electromagnetic transmitters wound on a longitudinal core member of a C-clamp shaped transmitter core. The downhole induction tool is suitable for transmitting magnetic excitation fields in multiple directions, both parallel and transverse to the downhole induction 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. The horizontal (transverse) members of the C-clamp shaped transmitter core can be rotated to orient a magnetic excitation flux path passing between the horizontal (transverse) members and through a downhole formation. The horizontal members can be replicated on a single longitudinal member to shape the magnetic excitation flux path.
    Type: Grant
    Filed: April 29, 2004
    Date of Patent: October 28, 2008
    Assignee: Baker Hughes Incorporated
    Inventors: Randy Gold, Stanislav W. Forgang
  • Patent number: 7436185
    Abstract: An apparatus for logging a formation traversed by a borehole includes a plurality of logging tools adapted for conveyance inside the borehole. The plurality of logging tools includes a tool body, a sensing pad responsive to a density property of the formation coupled to the tool body, a current emitting measure electrode responsive to a lateral resistivity property of the formation incorporated on the sensing pad, a mechanism for urging the sensing pad in contact with a side of the borehole coupled to the tool body, and a pair of mass isolation bands disposed about the tool body to isolate a mass of the tool body adjacent the measure electrode.
    Type: Grant
    Filed: June 27, 2005
    Date of Patent: October 14, 2008
    Assignee: Schlumberger Technology Corporation
    Inventors: Mark A. Fredette, Martin E. Poitzsch
  • Patent number: 7432716
    Abstract: A logging tool used in a borehole having non-conductive mud. The tool includes a known inductance in series with an electrode. The quality factor of a circuit that includes the electrode, the inductance and the earth formation is indicative of the resistivity of the formation. The quality factor may be determined using either a plurality of signals or by measuring a transient response.
    Type: Grant
    Filed: November 20, 2006
    Date of Patent: October 7, 2008
    Assignee: Baker Hughes Incorporated
    Inventors: Stanislav W. Forgang, Gregory B. Itskovich, Randy Gold, Homero Castillo
  • Patent number: 7427863
    Abstract: Method and system for calculating resistivity of an earth formation. At least some of the illustrative embodiments are methods comprising transmitting a current from a first current source, receiving at least part of the current at a first current return, said first current disposed remotely from the first current source, and measuring a first voltage at a monitor electrode, said monitor electrode disposed more remotely from below the first current source than said first current return.
    Type: Grant
    Filed: July 13, 2006
    Date of Patent: September 23, 2008
    Assignee: Halliburton Energy Services, Inc.
    Inventors: Michael S. Bittar, Guoyu (David) Hu, James Buchanan
  • Patent number: 7382136
    Abstract: An apparatus for investigating the wall of a borehole in a geological formation. The pad having shielding means which are arranged between a source electrode and a set of measurement electrodes and between the measurement electrodes and a return electrode. The shielding means being flush with or almost flush with the outside face of the pad and extending along the length of the outside face of the pad so that the electric field generated by the current and return electrodes is substantially eliminated in the pad and in the vicinity of the measurement electrodes.
    Type: Grant
    Filed: April 2, 2004
    Date of Patent: June 3, 2008
    Assignee: Schlumberger Technology Corporation
    Inventor: Andrew J. Hayman
  • Patent number: 7365545
    Abstract: A resistivity imaging device injects currents in two orthogonal directions using two pairs of return electrodes and performing impedance measurements of the buttons placed between the returns.
    Type: Grant
    Filed: December 29, 2005
    Date of Patent: April 29, 2008
    Assignee: Baker Hughes Incorporated
    Inventors: Gregory B. Itskovich, Randy Gold, Alexandre N. Bespalov, Stanislav Forgang
  • Publication number: 20080068025
    Abstract: A mixed mode tool uses an inductive source and detects galvanic currents and/or potentials at electrodes in proximity to a borehole wall to produce a resistivity image of the earth formation.
    Type: Application
    Filed: September 14, 2006
    Publication date: March 20, 2008
    Inventors: Randy Gold, Rashid W. Khokhar, Alexandre N. Bespalov, Leonty A. Tabarovsky
  • Patent number: 7265553
    Abstract: The invention concerns an apparatus for investigating the wall of a borehole tilled with non-conductive mud, said apparatus comprising: a pad having an inside face and an outside face for pressing against the wall of the borehole; a set of measurement electrodes mounted on the outside face of the pad, potentials differences being measured between said measurement electrodes in order to provide measured points representative of the resistivity of the formation; both a source electrode and a return electrode adapted to inject current into the formation, the set of measurement electrodes being situated between the source electrode and the return electrode.
    Type: Grant
    Filed: July 7, 2004
    Date of Patent: September 4, 2007
    Assignee: Schlumberger Technology Corporation
    Inventors: Philip Cheung, Andrew Hayman, Dennis Pittman, Richard Bloemenkamp
  • Patent number: 7242194
    Abstract: A resistivity tool for investigating a wall of a borehole drilled with a non-conductive mud includes a tool body adapted to be incorporated in a logging-while-drilling tool assembly; a resistivity sensor disposed on the tool body, wherein the resistivity sensor comprises a sensor pad supporting a current injector electrode, a current return electrode, and an array of measurement electrodes, and a circuitry for controlling current injection from the current injector electrode and for measuring voltage difference between electrodes in the array of measurement electrodes, wherein the current injector electrode and the current return electrode are disposed near opposite ends of the sensor pad and the array of measurement electrodes is disposed between the current injector electrode and the current return electrode, wherein the sensor pad is constructed of an insulating material and includes a conductive shielding member, or wherein the sensor pad is constructed of a conducting material and includes insulating sec
    Type: Grant
    Filed: May 12, 2004
    Date of Patent: July 10, 2007
    Assignee: Schlumberger Technology Corporation
    Inventors: Andrew J. Hayman, Philip Cheung
  • Patent number: 7150188
    Abstract: An apparatus for determining fluid-pressure diffusivity in a borehole (12) in a formation (10) includes an electrode (16) and a strain measuring device (18),(20) (or a particle velocity measuring device (18),(20) or a particle acceleration measuring device (18),(20)) disposed a fixed distance from the electrode (16). The electrode (16) injects an electrical current into a point on a wall of the borehole (12). The strain measuring device (18),(20) measures strain (or the particle velocity measuring device (18),(20) measuresd particle velocity or the particle acceleration measuring device (18),(20) measures particle acceleration) at the fixed distance from the point of injection of the electrical current over time. The fluid-pressure diffusivity is determined based on the measured strain (or measured particle velocity or measured particle acceleration) over time.
    Type: Grant
    Filed: December 16, 2004
    Date of Patent: December 19, 2006
    Assignee: Schlumberger Technology Corporation
    Inventors: Marwan Charara, Steven Pride, Patrice Ligneul