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公开(公告)号：US11746643B2
公开(公告)日：2023-09-05
申请号：US17382620
申请日：2021-07-22
发明人： Jun Zhang , Yibing Zheng
IPC分类号： E21B47/005 , G01V1/50 , G01V1/40 , E21B33/14
CPC分类号： E21B47/005 , G01V1/40 , G01V1/50 , E21B33/14
摘要： Various downhole logging tools and methods of using and making the same are disclosed. In one aspect a method evaluating cement bond quality in a well is provided. In a well with a particular casing/tubing configuration, waveforms of acoustic energy returning from the tubing and the casing with the tubing present are recorded. A frequency spectrum from the recorded waveforms is determined. Amplitudes of the returning acoustic energy at one or more preselected frequency(s) of interest of a range of frequencies at which the amplitudes are noticeably affected by cement bond quality for the particular casing/tubing configuration are determined. The determined amplitudes are compared with one or more baseline amplitudes to look for indications of cement bond quality. Other aspects involve time domain analysis.
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公开(公告)号：US20210348500A1
公开(公告)日：2021-11-11
申请号：US17382620
申请日：2021-07-22
发明人： Jun Zhang , Yibing Zheng
IPC分类号： E21B47/005 , G01V1/50 , G01V1/40
摘要： Various downhole logging tools and methods of using and making the same are disclosed. In one aspect a method evaluating cement bond quality in a well is provided. In a well with a particular casing/tubing configuration, waveforms of acoustic energy returning from the tubing and the casing with the tubing present are recorded. A frequency spectrum from the recorded waveforms is determined. Amplitudes of the returning acoustic energy at one or more preselected frequency(s) of interest of a range of frequencies at which the amplitudes are noticeably affected by cement bond quality for the particular casing/tubing configuration are determined. The determined amplitudes are compared with one or more baseline amplitudes to look for indications of cement bond quality. Other aspects involve time domain analysis.
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公开(公告)号：US11091999B2
公开(公告)日：2021-08-17
申请号：US16006064
申请日：2018-06-12
发明人： Jun Zhang , Yibing Zheng
IPC分类号： E21B47/005 , G01V1/50 , G01V1/40 , E21B33/14
摘要： Various downhole logging tools and methods of using and making the same are disclosed. In one aspect a method evaluating cement bond quality in a well is provided. In a well with a particular casing/tubing configuration, waveforms of acoustic energy returning from the tubing and the casing with the tubing present are recorded. A frequency spectrum from the recorded waveforms is determined. Amplitudes of the returning acoustic energy at one or more preselected frequency(s) of interest of a range of frequencies at which the amplitudes are noticeably affected by cement bond quality for the particular casing/tubing configuration are determined. The determined amplitudes are compared with one or more baseline amplitudes to look for indications of cement bond quality. Other aspects involve time domain analysis.
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公开(公告)号：US11078776B2
公开(公告)日：2021-08-03
申请号：US16787128
申请日：2020-02-11
发明人： Frank Wallace
摘要： A caliper-arm-retention mechanism for a caliper tool is disclosed. The retention mechanism includes a selectively movable retention sleeve and a pivot arm that cooperate to constrain relative translational motion between the pivot arm and a caliper arm pivotally engaged with the pivot arm while at the same time allowing relative rotational movement of the caliper arm and pivot arm. The retention sleeve may be selectively repositioned using a threaded nut configured to push the sleeve toward the pivot arm or pull the sleeve away from the pivot arm, depending on the direction of rotation of the nut.
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公开(公告)号：US20200264014A1
公开(公告)日：2020-08-20
申请号：US16793342
申请日：2020-02-18
发明人： Marvin Beckman , Thientu Ho , Loi Tran , Mark Hastings , Terry Hendrix
摘要： A caliper-arm-position sensor comprising a differential variable reluctance transducer (DVRT) and circuits to drive the DVRT with a substantially sinusoidal signal and to sample a signal at the DVRT once per drive-signal cycle at a predetermined position in the drive-signal cycle is disclosed.
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公开(公告)号：US20240229620A1
公开(公告)日：2024-07-11
申请号：US18095585
申请日：2023-01-11
发明人： Roger Archibald
IPC分类号： E21B43/119 , E21B43/116 , F42D1/05
CPC分类号： E21B43/119 , E21B43/116 , F42D1/05
摘要： A stack of addressable perforating guns with preassigned addresses may be configured for operation by identifying any duplicate addresses in the stack and deduplicating the addresses by assigning new addresses to at least a subset of any guns having the same address until each gun in the stack has an address unique in the stack.
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公开(公告)号：US20240044230A1
公开(公告)日：2024-02-08
申请号：US17879856
申请日：2022-08-03
发明人： Roger Archibald
IPC分类号： E21B43/1185 , E21B47/12 , F42D1/05
CPC分类号： E21B43/1185 , E21B47/12 , F42D1/05
摘要： An initiator circuit for a perforating gun includes a microprocessor structured to perform a circuit-startup algorithm comprising determining whether the circuit supply voltage is stable enough for operation and, if it is, or if a predetermined period of time has passed since powering up the circuit, sending a message indicating the circuit (and thus gun) is ready for operation. The sent message may be a communication uplink indicating an address of the circuit and its ready state or a short burst of pulses indicating the circuit's ready state.
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公开(公告)号：US11561113B2
公开(公告)日：2023-01-24
申请号：US16793342
申请日：2020-02-18
发明人： Marvin Beckman , Thientu Ho , Loi Tran , Mark Hastings , Terry Hendrix
IPC分类号： G01D5/22 , E21B47/00 , E21B47/085
摘要： A caliper-arm-position sensor comprising a differential variable reluctance transducer (DVRT) and circuits to drive the DVRT with a substantially sinusoidal signal and to sample a signal at the DVRT once per drive-signal cycle at a predetermined position in the drive-signal cycle is disclosed.
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公开(公告)号：US11021950B2
公开(公告)日：2021-06-01
申请号：US16432953
申请日：2019-06-06
发明人： Kee Siu , Mark Lloyd , Johnathan Miko , Angel Mendoza
IPC分类号： G01V3/18 , E21B49/08 , G01V3/20 , G01N27/22 , G01N27/07 , E21B47/07 , G01N33/28 , G01N27/06 , G01N27/02 , G01N27/74 , G01V3/38 , G01V3/30
摘要： A sensor comprising three electrodes forming two electrode pairs, each pair having a gap between the electrodes, is disclosed. An electrically insulating layer is disposed in the gap of one electrode pair. The sensor may include a RC oscillator circuit connected to the electrode pair having the insulating layer such that the electrode pair contributes to the capacitance of the circuit. The sensor may include a power supply connected to the other electrode pair to provide a voltage across and current through material in the pair's gap. The sensor may be disposed in a borehole to allow borehole fluid to enter the gaps and the RC oscillator circuit and power supply may be operated to provide a measure of capacitance and resistance characteristics of the borehole fluid.
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公开(公告)号：US20200263532A1
公开(公告)日：2020-08-20
申请号：US16787128
申请日：2020-02-11
发明人： Frank Wallace
IPC分类号： E21B47/01
摘要： A caliper-arm-retention mechanism for a caliper tool is disclosed. The retention mechanism includes a selectively movable retention sleeve and a pivot arm that cooperate to constrain relative translational motion between the pivot arm and a caliper arm pivotally engaged with the pivot arm while at the same time allowing relative rotational movement of the caliper arm and pivot arm. The retention sleeve may be selectively repositioned using a threaded nut configured to push the sleeve toward the pivot arm or pull the sleeve away from the pivot arm, depending on the direction of rotation of the nut.
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