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    TUNNEL BORING SYSTEM
    2.
    发明公开
    TUNNEL BORING SYSTEM 审中-公开

    公开(公告)号：EP4026983A1

    公开(公告)日：2022-07-13

    申请号：EP21213552.9

    申请日：2021-12-09

    申请人： EarthGrid PBC

    发明人： Helming, Troy Anthony

    IPC分类号： E21B7/14 ,  E21B7/15 ,  E21D9/10

    摘要： A plasma tunnel boring machine including a plurality of plasma torches on the cutting head, and a plurality of nozzles on the cutting head to provide a stream to cool an area while the plasma torches are active, and a tractor providing propulsion to the cutting head, the tractor to move the cutting head to cut a tunnel.

    DRILLING FLUID FOR DOWNHOLE ELECTROCRUSHING DRILLING
    6.
    发明公开
    DRILLING FLUID FOR DOWNHOLE ELECTROCRUSHING DRILLING 审中-公开

    公开(公告)号：EP3828248A1

    公开(公告)日：2021-06-02

    申请号：EP21153300.5

    申请日：2016-06-16

    申请人： Halliburton Energy Services Inc. ,  Chevron U.S.A. Inc.

    发明人： MCDANIEL, Cato Russell ,  SHUMWAY, William Walter ,  VAN SLYKE, Donald Curtis

    IPC分类号： C09K8/32 ,  C09K8/34 ,  E21B7/15

    摘要： The disclosure relates to an electrocrushing drilling fluid with an electrocrushing drilling base fluid including a polar oil, a non-polar oil, or a combination thereof and glycerine carbonate. The electrocrushing drilling fluid or base fluid may further include water or glycerin. The electrocrushing drilling fluid may further contain at least one additive. The electrocrushing drilling fluid may have a dielectric constant or dielectric strength of at least a set amount, an electric conductivity less than a set amount, or a combination of these properties. The disclosure further relates to an electrocrushing drilling system containing the electrocrushing drilling fluid and an electrocrushing drill bit.

    ELECTRICAL PULSE DRILL BIT HAVING SPIRAL ELECTRODES
    10.
    发明公开
    ELECTRICAL PULSE DRILL BIT HAVING SPIRAL ELECTRODES 审中-公开

    公开(公告)号：EP3405640A1

    公开(公告)日：2018-11-28

    申请号：EP17741997.5

    申请日：2017-01-20

    申请人： Baker Hughes, a GE company, LLC

    发明人： LEHR, Joerg ,  ANDERS, Erik

    IPC分类号： E21B7/15 ,  E21B10/00

    摘要： A drill bit assembly includes a drill bit body, an insulating layer disposed on an end of the drill bit body and that defines a drill bit face and two electrodes formed such that they both extend from the drill bit face. The two electrodes form a spiral on the drill bit face and are equidistant from each other at all locations of the drill bit face.