Baker Hughes, a Ge Compnay, LLC

Baker Hughes Corporation

Baker Hughes Holdings LLC

Steven Allen Morris

Gregory Boris Itskovich

Sushant Dutta

Arcady Reiderman

Stanislav W Forgang

Jonathan F Hook

Teruhiko Hagiwara

Sheng Fang

Yi Liu

Fei Le

Marina Nikolaevna Nikitenko

Sushant M Dutta

Marina Nikitenko

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

Methods and systems for estimating properties of formations including conveying a carrier through a borehole having a first transmitter, a second transmitter collocated with the first transmitter, a first receiver, and a second receiver, the first receiver positioned a first distance from the first transmitter and the second receiver positioned a second distance therefrom, generating a transient electromagnetic field with the first transmitter, generating a suppression signal with the second transmitter, the suppression signal configured to suppress a response received by the first and second receivers that is caused by the transient electromagnetic field interacting with the carrier, measuring a signal with suppressed pipe signal at the first and second receivers, the measured signal representing the formation response to the transient electromagnetic field, estimating a formation property from the measured signal to select a model, and adjusting a drilling operation based on the estimated property of the formation.

Method and apparatus for active suppression of pipe signals in transient electromagnetic measurements

Systems, devices, and methods for evaluating an earth formation. Apparatus include an electrically conducting tubular; at least one transmitter configured to propagate an electromagnetic field in the earth formation; and at least one receiver configured to receive an electromagnetic signal resulting from interaction of an electromagnetic field with said earth formation. The at least one transmitter and at least one receiver may employ antenna assemblies comprising: a recess in the conducting tubular defined by at least one radially extending surface substantially perpendicular to a longitudinal axis of the conducting tubular and non-radially extending surfaces; an antenna in the recess; and conductive shielding, the conductive shielding having a conductivity significantly more than a conductivity of the conducting tubular and covering the whole of each of the plurality of radially extending surfaces.

Downhole deep transient measurements with improved sensors

A method for estimating a property of an earth formation penetrated by a borehole, the method comprising generating a first transient electromagnetic fields with a transmitter on a carrier located outside of the borehole and receiving associated signals, calculating a bucking coefficient using the measured signals, conveying the carrier through a borehole, generating a second transient electromagnetic field and receiving associated signals, calculating, a bucked signal using the bucking coefficient and the downhole signals, calculating synthetic formation signals, calculating synthetic formations signals by applying a Duhamel's integral to the measured signals and the synthetic formation signals, calculating a synthetic bucked signal, and performing an inversion of a formation model to estimate a property of the formation such that an inverted synthetic bucked signal and an inverted bucked signal coincide within a predetermined range.

Method and apparatus for estimating formation properties using transient electromagnetic measurements while drilling

Methods and systems for estimating properties of formations penetrated by boreholes are provided, including conveying a carrier through a borehole having a transmitter, a first receiver, and a second receiver, the first receiver positioned a first distance from the transmitter and the second receiver positioned a second distance from the transmitter, generating a transient electromagnetic field with the transmitter, obtaining a total signal from signals received by the first receiver and the second receiver, performing a bucking calculation to obtain a pipe signal, applying a correction scheme to the total signal to generate a corrected formation property signal, wherein the correction scheme is V=V&#x2212;P*V, wherein Vis a correction signal, Vis the total signal, and P is the pipe signal, estimating a formation property from corrected formation property signal to select a model of the formation, and adjusting a drilling operation based on the estimated property of the formation.

Method and apparatus for correction of transient electromagnetic signals to remove a pipe response

Methods and systems for estimating properties of earth formations including conveying a carrier through a borehole having a transmitter, a first receiver, and a second receiver, the first receiver positioned a first distance from the transmitter and the second receiver positioned a second distance therefrom, generating with the transmitter a transient electromagnetic field, receiving a first measured signal at the first receiver, receiving a second measured signal at the second receiver, obtaining a total signal from the first measured signal and the second measured signal, determining a bucking coefficient, performing a bucking calculation employing the bucking coefficient, the first measured signal, and the second measured signal to extract a pipe signal, suppressing the pipe signal from the total signal to obtain a formation signal, estimating a formation property from the formation signal, and adjusting a drilling operation based on the estimated property of the formation.

Method and apparatus for measurement of pipe signals for downhole transient electromagnetic processing

Apparatuses and methods are provided herein that may improve sensitivity to transient signals. For example, an electromagnetic sensor for downhole measurements that includes a plurality of sectors (e.g., four quadrants) is provided herein. Each quadrant may include a magnetic core formed of a material with a high initial magnetic permeability to improve sensitivity to transient signals. A sensor for continuous wave induction tools is also provided, and may include a magnetic core formed of a material with a high initial magnetic permeability. Forming each sector magnetic core of a material with a high mechanical reliability may allow the magnetic core of the corresponding sensor to be pliable and flexible and not brittle and prone to breaking. Furthermore, the corresponding sensor may have enhanced sensitivity, greater stability of sensitivity relative to temperature changes, and high mechanical reliability.

Induction logging sensor

Systems, devices, and methods for evaluating an earth formation. Methods may include inducing a current in the formation; measuring a time-dependent transient electromagnetic (TEM) signal induced by the formation responsive to the current; and estimating apparent resistivity values for each of a plurality of samples derived from the TEM measurement, wherein each sample corresponds to a discrete time window of the TEM measurement. Estimating the apparent resistivity values for each of the samples includes determining for each sample a simulated homogeneous formation that provides a best fit for the sample. The apparent resistivity values may be used to estimate distance to an interface. The apparent resistivity values or the estimated distance may be logged and the log displayed. The apparent resistivity values, the estimated distance, or the log may be used to conduct further operations in a borehole, including geosteering.

Determination and display of apparent resistivity of downhole transient electromagnetic data

Systems, devices, and methods for evaluating an earth formation. Apparatus may include a carrier configured for conveyance in a borehole including a conducting tubular comprising a reduced conductivity portion made of reduced conductivity material adjacent at least one of (i) at least one transmitter antenna, and (ii) at least one receiver antenna on the carrier. The material may be a composite and may have a resistivity of between 10and 10ohm-meters. Methods and apparatus may be configured for producing time-dependent transient electromagnetic (TEM) signals using the transmitter(s) and receiver(s) and estimating a value of a resistivity property using the signals. The apparatus may be used in drilling and may include a bottom hole assembly with a drill bit, and the value may be indicative of a portion of the earth formation ahead of the bit. The value may be used to conduct further operations in a borehole, including geosteering.

Transient electromagnetic tool mounted on reduced conductivity tubular

An apparatus for estimating a property of an earth formation penetrated by a borehole includes: a borehole carrier; a first switchable-magnet; a first energy storage device coupled to the first switchable magnet; a second switchable-magnet; a second energy storage device coupled to the second switchable-magnet; at least one voltage source having a first polarity and a second polarity opposite of the first polarity; and an electrical circuit configured to charge the first energy storage device and the second energy storage device at the same time and to sequentially discharge the first energy storage device and the second energy storage device, the electrical circuit being further configured to charge the first and second energy storage devices to the first polarity and then charge the first and second energy storage devices to the second polarity after the first and second energy storage devices are discharged.

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Spring, TX, United States of America

Steven Allen Morris