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公开(公告)号:US20230037403A1
公开(公告)日:2023-02-09
申请号:US17392851
申请日:2021-08-03
摘要: 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.
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公开(公告)号:US20220413178A1
公开(公告)日:2022-12-29
申请号:US17356992
申请日:2021-06-24
摘要: 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.
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公开(公告)号:US11619760B2
公开(公告)日:2023-04-04
申请号:US17356992
申请日:2021-06-24
摘要: 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.
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公开(公告)号:US10812069B1
公开(公告)日:2020-10-20
申请号:US16532746
申请日:2019-08-06
IPC分类号: H03K17/687 , E21B4/04 , G01V3/18 , H02M3/156
摘要: A switch driving circuit includes an output coil having a first end and a second end and configured to receive positive or negative pulses from an input coil and a drive portion that includes a holding capacitor coupled across the output coil. The circuit also includes a discharge circuit that includes a discharge switch connected across the output coil, the discharge circuit having a discharge resistor and a discharge capacitor connected in parallel with each other and across control terminals of the discharge switch and a shunt circuit connected across the output coil that shorts the first end to the second end after a positive pulse is received.
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