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    INTERWELL TOMOGRAPHY METHODS AND SYSTEMS EMPLOYING A CASING SEGMENT WITH AT LEAST ONE TRANSMISSION CROSSOVER ARRANGEMENT
    31.
    发明公开
    INTERWELL TOMOGRAPHY METHODS AND SYSTEMS EMPLOYING A CASING SEGMENT WITH AT LEAST ONE TRANSMISSION CROSSOVER ARRANGEMENT 审中-公开

    公开(公告)号：EP4212698A1

    公开(公告)日：2023-07-19

    申请号：EP23156110.1

    申请日：2015-04-23

    申请人： Halliburton Energy Services, Inc.

    发明人： Bittar, Michael ,  Menezes, Clive

    IPC分类号： E21B47/01 ,  E21B47/13 ,  E21B49/00 ,  E21B7/04 ,  E21B47/0228 ,  E21B43/16 ,  E21B47/113 ,  G01V3/38

    摘要： An interwell tomography method includes casing a first borehole with a casing tubular having at least one transmission crossover arrangement, each transmission crossover arrangement having an adapter in communication with a coil antenna that encircles an exterior of the casing tubular. The method also includes deploying, inside the casing tubular, a conductive path that extends from a surface interface to the at least one transmission crossover arrangement. The method also includes providing a set of one or more antennas in a second borehole. The method also includes obtaining electromagnetic (EM) measurements for interwell tomography using the at least one transmission crossover arrangement and the set of one or more antennas, where said obtaining involves conveying data or power between the at least one transmission crossover arrangement and the surface interface via the conductive path.

    DOWNHOLE COMMUNICATION
    34.
    发明公开
    DOWNHOLE COMMUNICATION 审中-公开

    公开(公告)号：EP4119768A1

    公开(公告)日：2023-01-18

    申请号：EP22193205.6

    申请日：2018-03-29

    申请人： Metrol Technology Ltd

    发明人： HUDSON, Steve Martin ,  JARVIS, Leslie David

    IPC分类号： E21B47/001 ,  E21B47/13

    摘要： A downhole communication system for communication between a first and second location in a subsea oil and/or gas well installation. The oil and/or gas well installation comprises out of hole metallic structure comprising a riser 3 running upwards away from the mudline ML, and downhole metallic structure 2 running down into the well. The communication system is arranged so that at least part of a signal path for communications between the first and second locations is provided by the downhole metallic structure 2 such that, in use, data to be communicated between the first and second locations is carried by electrical signals in the downhole metallic structure 2. The communication system further comprises a first noise cancellation arrangement 5 arranged for sensing a noise signal generated in the out of hole metallic structure and arranged for applying a corresponding noise cancelling signal to the out of hole metallic structure or the downhole metallic structure to inhibit introduction of electrical noise into the downhole metallic structure 2 from the riser 3.