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公开(公告)号：EP3042023B1
公开(公告)日：2018-08-08
申请号：EP13892882.5
申请日：2013-09-05
CPC分类号： E21B47/122 , E21B17/003
摘要： A range of apparatus and methods for providing local and long range data telemetry within a wellbore is described. These apparatus and methods may be combined in a wide variety of ways. In some embodiments data is transmitted across a gap in a drill string using signals of a higher frequency for which an electrical impedance of the gap or of a filter connected across the gap is low. Low-frequency EM telemetry signals may be applied across the gap. The gap and any filter connected across the gap present a high impedance to the low-frequency EM telemetry signals. The described technology may be applied for transferring sensor readings between downhole electrical packages. In some embodiments sensors are electrically connected across electrically insulating gaps in the drill string.
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公开(公告)号：EP2920402B1
公开(公告)日：2019-03-13
申请号：EP13855824.2
申请日：2013-11-15
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公开(公告)号：EP3042023A1
公开(公告)日：2016-07-13
申请号：EP13892882.5
申请日：2013-09-05
CPC分类号： E21B47/122 , E21B17/003
摘要： A range of apparatus and methods for providing local and long range data telemetry within a wellbore is described. These apparatus and methods may be combined in a wide variety of ways. In some embodiments data is transmitted across a gap in a drill string using signals of a higher frequency for which an electrical impedance of the gap or of a filter connected across the gap is low. Low-frequency EM telemetry signals may be applied across the gap. The gap and any filter connected across the gap present a high impedance to the low-frequency EM telemetry signals. The described technology may be applied for transferring sensor readings between downhole electrical packages. In some embodiments sensors are electrically connected across electrically insulating gaps in the drill string.
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公开(公告)号：EP3418488B1
公开(公告)日：2020-11-04
申请号：EP18187620.2
申请日：2013-09-05
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公开(公告)号：EP3585981A1
公开(公告)日：2020-01-01
申请号：EP18758325.7
申请日：2018-02-26
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6.发明公开
公开(公告)号：EP3585977A1
公开(公告)日：2020-01-01
申请号：EP18757456.1
申请日：2018-02-22
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公开(公告)号：EP3418488A1
公开(公告)日：2018-12-26
申请号：EP18187620.2
申请日：2013-09-05
摘要： A range of apparatus and methods for providing local and long range data telemetry within a wellbore is described. These apparatus and methods may be combined in a wide variety of ways. In some embodiments data is transmitted across a gap in a drill string using signals of a higher frequency for which an electrical impedance of the gap or of a filter connected across the gap is low. Low-frequency EM telemetry signals may be applied across the gap. The gap and any filter connected across the gap present a high impedance to the low-frequency EM telemetry signals. The described technology may be applied for transferring sensor readings between downhole electrical packages. In some embodiments sensors are electrically connected across electrically insulating gaps in the drill string.
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公开(公告)号：EP2917481B1
公开(公告)日：2018-02-21
申请号：EP13854109.9
申请日：2013-11-06
发明人： LOGAN, Aaron W. , DERKACZ, Patrick R. , LOGAN, Justin C. , SWITZER, David A. , LIU, Jili (Jerry) , KAZEMI MIRAKI, Mojtaba
CPC分类号： E21B47/122 , E21B17/003 , E21B47/01
摘要： An assembly for use in subsurface drilling includes a downhole probe having an EM telemetry signal generator and electrical contacts for carrying telemetry signals from the EM telemetry signal generator to first and second parts of a gap sub in a drill string. An outside surface of the probe and an inside surface of the gap sub are covered with layers of electrically-insulating material. Electrical conduction paths internal to the gap sub are removed, thereby increasing efficiency of EM telemetry.
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