A METHOD FOR COMBINED RESISTIVITY AND PERMITIVITY DETERMINATION WITH BOREHOLE IMAGERS

    公开(公告)号:WO2019190532A1

    公开(公告)日:2019-10-03

    申请号:PCT/US2018/025203

    申请日:2018-03-29

    Abstract: A method and system for resistivity imaging may comprise disposing a downhole tool into a borehole, wherein the downhole tool comprises a pad and a plurality of electrodes disposed on the pad, taking an impedance measurement with the plurality of electrodes, applying a correction to the measured impedance by using a relaxation constant of the measured impedance to find a corrected impedance for each electrode of the plurality of electrodes, and constructing an image from the corrected impedance, wherein the image maps formation impedance. The system for resistivity imaging may comprise a downhole tool, a conveyance for disposing the downhole tool in a borehole, and an information handling system. The downhole tool may further comprise an arm and a pad wherein the pad comprises a plurality of electrodes and at least one return electrode.

    STEERING PAD OVEREXTENSION PREVENTION FOR ROTARY STEERABLE SYSTEM

    公开(公告)号:WO2019133034A1

    公开(公告)日:2019-07-04

    申请号:PCT/US2018/020783

    申请日:2018-03-02

    Abstract: A steering head for steering a drill string may include a pad pusher including a steering pad and a piston. The steering pad may have a pivot axis, and be rotatable about the pivot axis between retracted and extended positions. The pad pusher may further include a motion restrictor to restrict rotation about the pivot axis. The steering head may further include a housing having a motion restrictor disposed at a position corresponding to the pad pusher motion restrictor. The pad pusher motion restrictor may be engageable with the housing motion restrictor to restrict motion of the steering pad relative to the housing.

    ELECTROMAGNETIC WAVES RESISTIVITY COMPUTATION USING ACCELERATED SEGMENTED LOOKUP TABLE

    公开(公告)号:WO2019132936A1

    公开(公告)日:2019-07-04

    申请号:PCT/US2017/068787

    申请日:2017-12-28

    Inventor: CHOO, Weng Fatt

    Abstract: A method for well logging may comprise: inserting a downhole tool into a wellbore penetrating a subterranean formation wherein the downhole tool comprises: a transmitter; a receiver; a memory configured to store at least one look up table with polynomial coefficients; and a processor coupled to the memory; obtaining a measurement using the resistivity tool; and generating a resistivity output using the measurement as an input to a polynomial with polynomial coefficients sourced from the look up table.

    ACCELEROMETER SYSTEMS AND METHODS FOR ROTATING DOWNHOLE TOOLS

    公开(公告)号:WO2019118188A1

    公开(公告)日:2019-06-20

    申请号:PCT/US2018/063078

    申请日:2018-11-29

    CPC classification number: E21B47/022 G01P15/18 G01V7/00

    Abstract: A method may comprise obtaining, during drilling operations within a wellbore, two-dimensional accelerometer data with an accelerometer on a rotating downhole tool, determining a radial offset of the accelerometer based on the two-dimensional accelerometer data, and determining a centripetal acceleration of the accelerometer based on the two-dimensional accelerometer data. A system may comprise one or more x-axis accelerometers disposed on a bottom hole assembly, one or more y-axis accelerometers disposed on the bottom hole assembly, an analog to digital converter, wherein the analog to digital converter converts an analog signal from the one or more x-axis accelerometers and the one or more y-axis accelerometers to a digital signal, and a computing subsystem.

    COMPONENT SIGNAL DECOUPLING FOR MULTI-SUB RESISTIVITY TOOL WITH SPACED ANTENNAS

    公开(公告)号:WO2019117873A1

    公开(公告)日:2019-06-20

    申请号:PCT/US2017/065846

    申请日:2017-12-12

    Abstract: Methods and systems for decoupling a component signal. A method may comprise disposing a logging tool in a wellbore, capturing a signal response with the logging tool from a formation, wherein the logging tool comprises a first receiver, a second receiver, and a third receiver, averaging the first receiver and the third receiver to generate a first pseudo antenna, generating a second pseudo antenna which comprises an azimuth offset, employing an attenuation factor and expansion factor to generate a pseudo collated antenna. Furthermore combining responses from a transmitter, the first pseudo antenna, and the second pseudo antenna to decouple a component, which may determine the boundaries of a formation from the component. A well measurement system for decoupling a component may comprise a logging tool, conveyance, and information handling system. The logging tool may comprise a first downhole tool, a receiver, and a transmitter.

    ACTUATOR FOR MULTILATERAL WELLBORE SYSTEM
    39.
    发明申请

    公开(公告)号:WO2019099037A1

    公开(公告)日:2019-05-23

    申请号:PCT/US2017/062405

    申请日:2017-11-17

    Abstract: A lateral wellbore access system is used for moving an isolation sleeve relative to a window of a completion sleeve to adjust access through the window. The system includes an actuator having an isolation sleeve coupling mechanism and a driving mechanism. The isolation sleeve coupling mechanism is configured to engage with an isolation sleeve. The driving mechanism is configured to longitudinally reciprocate the isolation sleeve coupling mechanism within a bore of a completion sleeve to longitudinally move an isolation sleeve coupled to the isolation sleeve coupling mechanism within the bore relative to a window of the completion sleeve. Movement of the isolation sleeve adjusts a position of the isolation sleeve relative to the completion sleeve window for permitting or blocking access through the window into the bore.

    SEALED BALLISTIC TRANSFER APPARATUS
    40.
    发明申请

    公开(公告)号:WO2019098995A1

    公开(公告)日:2019-05-23

    申请号:PCT/US2017/061564

    申请日:2017-11-14

    Abstract: This disclosure may generally relate to subterranean operations. A ballistic transfer apparatus may include a detonation transfer line, wherein the detonation transfer line comprises a first end and a second end; a first holder in engagement with the first end of the detonation transfer line to retain the detonation transfer line in the ballistic transfer apparatus; a second holder in engagement with the second end of the detonation transfer line to retain the detonation transfer line in the ballistic transfer apparatus; and a shroud extending between the first holder and the second holder that covers the detonation transfer line.

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