Baker Hughes Corporation

Baker Hughes Oilfield Operations LLC

Western Atlas International, Inc.

Baker Hughes, a Ge Compnay, LLC

Baker Hughes Holdings LLC

Stanislav W Forgang

Randy Gold

Otto N Fanini

Luis M Pelegri

Alexandre N Bespalov

Michael S Crosskno

Gregory Boris Itskovich

Leonty Abraham Tabarovsky

Marc Stephen Ramirez

Michael Rabinovich

Babak Kouchmeshky

Carl M Edwards

Yi Liu

Fei Le

Rocco DiFoggio

Arcady Reiderman

Liming Yu

Berthold Kriegshauser

Carlos A Yanzig

Tsili Wang

Borislav J Tchakarov

Gulamabbas A Merchant

Sushant Dutta

Bill H Corley

Steven Allen Morris

James C Hunziker

Jonathan F Hook

Cynthia Xue

Youssef Boulaknadal

Ryan Rocheleau

Zhiyong Jiang

Stephen V Painchaud

Daniel T Georgi

Douglas J Patterson

Vimal Vinod Shah

Roland Edward Chemali

Sven Krueger

Sheng Fang

Jinsong Zhao

Homero C Castillo

Rashid W Khokhar

Hermanus J Nieuwoudt

Zinovy B Krugliak

Quming Zhou

John T Evans

Jack Signorelli

Julio Roberto Arro

Marcelo Civarolo

Louis Perez

Carlos Felipe Rivero

Samuel Bell

Xiaochu Yao

Yinxi Zhang

Pawel J Matuszyk

Stephen N Dymmock

Marcelo F Civarolo

John Edgar Jones

Peter John Nolan

Dinesh P Shah

Souhib Harb

Tammye Crosskno, Legal Representative

Peter Withers

Vimal Shah

Marc S Ramirez

Sushant M Dutta

A system for performing downhole logging operations includes a conductor coil configured to alternate between producing a magnetic field and measuring a magnetic field induced in a formation, a power supply couplable to the conductor coil for providing an electrical control current to conductor coil, and a signal acquisition system couplable to the conductor coil. The system further includes a permanent magnet coupled to the conductor coil, and a multi-state switch operable in a first state and a second state. In the first state, the conductor coil is coupled to an output of the power supply and decoupled from an input of the signal acquisition system. In the second state, the conductor coil is coupled to the input of acquisition electronics and decoupled from the output of the power supply.

Power-efficient transient electromagnetic evaluation system and method

A resistivity imaging device and a method of operating the resistivity imaging device in a wellbore. The resistivity imaging device includes a first electrode, a second electrode, and a circuit electrically coupled to the first electrode and the second electrode. An impedance is measured of a formation surrounding the wellbore. Based on the impedance, the circuit is configured into one of a first circuit configuration for operating the resistivity imaging device in a first mode and a second circuit configuration for operating the resistivity imaging device in a second mode. The resistivity imaging device is operated using the circuit in the one of the first circuit configuration and the second circuit configuration.

Dual range micro-resistivity measurement method

A device for generating oscillating signals includes an energy transfer device configured to apply an oscillating signal to a sensitive volume, and a resonant tuning circuit including the energy transfer device. The tuning circuit includes a tuning capacitor configured to cause the tuning circuit to resonate at a selected frequency, and an energy storage device. The transmitting device also includes a controller configured to apply a pulse sequence to the tuning circuit having a series of pulses, the energy storage device configured to retain electrical energy at an end of a first pulse, and discharge the electrical energy to the tuning circuit at an onset of a next pulse of the pulse sequence.

Efficient damped pulsed energy transmitter

Methods and logging systems for performing nuclear magnetic resonance (NMR) logging in downhole operations are described. The methods include performing a scout logging acquisition operation using an NMR logging tool to determine NMR logging parameters of a formation interval, setting an NMR logging acquisition mode based on the NMR logging parameters from the scout logging acquisition operation, and performing an NMR data logging operation to determine properties of the formation interval based on the set NMR logging acquisition mode.

Adaptive real-time nuclear magnetic resonance logging for subsurface operations

A multi-frequency tuning circuit includes a first branch including a first inductor and a first capacitor arranged in series and a second branch including a second inductor and a second capacitor arranged in series. The circuit is arranged within a circuitry module configured to be positioned between a source and a load, the first branch and the second branch both associated with loads, from the source, having low impedance frequencies. In order to improve transmitter antenna output power for downhole tools, the tuning circuit creates high impedance at operating frequencies between frequencies corresponding to low impedance.

Multi-frequency tuning network system and method

A system for downhole frequency re-tuning includes a receiver antenna, a receiver matching network, a transmitter antenna, the transmitter antenna outputting a signal that is received at the receiver antenna, a transmitter matching network, a power amplifier providing operational power to the transmitter antenna, and a frequency sweeping system. The frequency sweeping system includes an oscillator, coupled to the power amplifier, the oscillator providing an input signal to the power amplifier to adjust power output to the transmitter antenna. The system also includes a circulator, positioned between the power amplifier and the transmitter matching network, the circulator directing the operational power to the transmitter antenna. The system further includes a reflected power meter, coupled to the circulator, the reflected power meter receiving reflected power at the transmitter antenna responsive to receiver antenna. The system also includes a control module.

Tuning systems and methods for downhole antennas

An apparatus for performing a nuclear magnetic resonance (NMR) measurement in a borehole penetrating a subsurface formation includes an NMR tool having an outside diameter that is less than an inside diameter of a drill tubular disposed in the borehole, the drill tubular having an opening at the distal end of the drill tubular leading into the borehole, and a retaining device configured to allow at least a section of the NMR tool to protrude through the opening of the drill tubular and prevent an unrestrained release of the NMR tool through the opening. The apparatus also includes a transmitter antenna and a receiver antenna coupled to the NMR tool, wherein the transmitter antenna and/or the receiver antenna are extendable from the NMR tool.

Through-bit reconfigurable NMR logging tool

An NMR measurement apparatus includes a transmitting antenna including a transmitter coil, a capacitor, a dissipating component and a restricting component, and a receiving antenna physically separated from the transmitting antenna. A processor is configured to apply a drive signal at a first voltage level to generate a transmission signal having a selected transmission frequency, where the receiving antenna is deactivated during generation, connect the dissipating component to the transmitter coil to dissipate stored energy in the transmitter coil, connect the restricting component to the transmitter coil to restrict the transmitting antenna to a second voltage level smaller than the first voltage level and based on a voltage of NMR signals from the sensitive volume, activate the receiving antenna and detect a NMR signal, where the restricting component is connected to the transmitter coil and restricts the transmitting antenna during the activating and the detecting.

Control of tranmsitting and receving antenna properties to reduce electromagnetic coupling

An example method includes disposing a carrier in a borehole in an earth formation. The carrier includes a logging assembly for performing a formation evaluation of the earth formation using a sensor in proximity to a borehole wall of the borehole, fluid being disposed at least partially between the sensor and the borehole wall. The method further includes estimating an apparent dielectric loss angle of the fluid to determine a stand-off effect caused by the fluid. The method further includes estimating a formation dielectric loss angle and determining a formation resistance based at least in part on the formation dielectric loss angle. The method further includes adjusting the formation evaluation based at least in part on the estimated formation resistance that accounts for the stand-off effect caused by the fluid. The method further includes performing a wellbore operation based at least in part on the adjusted formation evaluation.

Disposing a carrier downhole in a wellbore to evaluate an earth formation

A downhole electrical logging tool includes a mandrel, and a pad coupled to and radially extendable from the mandrel. The pad includes an isolated power supply configured to receive DC or AC power via the mandrel and convert the DC or AC power into one or more DC voltages for powering electronic components on the pad. The pad further includes a digital data processor (e.g., a microcontroller, field programmable gate array, or digital signal processor) powered by the isolated power supply, a transmitter electrode, and a sensing electrode. The pad also includes a housing in which the controller and isolated power supply are located, and a pad body coupled to the mandrel. Components inside the housing are electrically isolated from the pad body. The tool further includes a signal generator electrically coupled to the transmitter electrode to drive the transmitter electrode.

Downhole resistivity imaging pad with electrical leakage prevention

Apparatus and methods for estimating a value of a resistivity property of an earth formation intersected by a borehole. Apparatus may include a carrier conveyable in the borehole; a tri-axial induction antenna assembly along the carrier; and a magnetically transparent sleeve enclosing the antenna assembly. The antenna assembly includes panels circumferentially arrayed about a portion of the carrier to form at least three collocated antennas. Each panel includes a magnetic core, an axially sensing coil that is transversely wound about the magnetic core, and a laterally sensing coil that is longitudinally wound about the magnetic core. The axially sensing coil of each panel may be electrically connected to the axially sensing coils of the other panels to form an axial antenna. Corresponding lateral coils may be electrically connected to form a lateral antenna. Each panel may be individually removable from the carrier, and assembled together may form a cylinder.

Downhole tri-axial induction electromagnetic tool

An apparatus for performing a nuclear magnetic resonance (NMR) experiment in a borehole penetrating the earth includes: a carrier configured to be conveyed through the borehole; an antenna assembly disposed on the carrier and configured to receive an NMR signal; and an active gain circuit having an input coupled to the antenna and configured to apply gain to the received NMR signal and to provide an output signal comprising NMR experiment data. The apparatus also includes a feedback circuit configured to feed the output signal back to the input of the active gain circuit; wherein the signal fed back to the input of the active gain circuit is out of phase with the received NMR signal and the feedback circuit provides an electrical quality factor Q value of an antenna assembly that is less than the electrical quality factor Q value of the antenna assembly without the feedback circuit.

Active damping for multi-frequency NMR logging tools

Systems, devices, and methods for estimating a value of a downhole parameter of interest. Aspects include an apparatus for evaluating a tubular. The apparatus may include a sensor including an electromagnetic acoustic transducer (EMAT) device configured to be conveyed into the tubular. The EMAT device may include measurement circuitry comprising at least one conductive coil; and a magnet array comprising magnets arranged with a corresponding direction of magnetization of each magnet oriented according to a configuration producing a greater magnetic flux on a first side of the array than on a second side opposing the first side. The magnetic flux produced from the second side may be substantially zero. In embodiments, the configuration of magnets comprises at least a first set of permanent magnets in a linear Halbach configuration.

Downhole electromagnetic acoustic transducer sensors

A nuclear magnetic resonance apparatus for estimating properties of an earth formation includes a carrier configured to be deployed in a borehole in the earth formation and at least one transmitting assembly disposed in the carrier and configured to generate an oscillating magnetic field in a volume of interest within the earth formation. The apparatus also includes at least one receiving assembly disposed in the carrier and configured to detect a nuclear magnetic resonance (NMR) signal originating in the volume of interest. In this apparatus, the receiving assembly includes at least a first longitudinal region with a loop coil and a butterfly coil, the loop coil central axis being located over a region of the magnet assembly where a static magnetic field is predominantly along an azimuthal direction to the carrier and the butterfly coil being at least partially overlapped with the loop coil to reduce mutual coupling.

Arrays of receive antennas for magnetic resonance measurements

Nuclear magnetic resonance apparatuses and methods for estimating properties of an earth formation are provided. An apparatus includes a carrier configured to be deployed in a borehole, at least one transmitting assembly configured to generate an oscillating magnetic field in a volume of interest within the earth formation, at least one receiving assembly configured to detect a nuclear magnetic resonance (NMR) signal originating in the volume of interest; and a magnet assembly configured to generate a static magnetic field in the formation from a primary side of the magnet assembly. The magnet assembly includes an array of longitudinally elongated magnets having a rotating pattern of magnetic orientations, the array configured to generate the static magnetic field in the volume of interest, and the static magnetic field strength is higher at the primary side than the field strength at a side of the magnet assembly that is opposite the primary side.

Magnet arrays for magnetic resonance measurements

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Houston, TX, United States of America

Stanislav W Forgang