METHOD AND DEVICE FOR EXCAVATING OIL WELL OF ABYSS

    公开(公告)号:JPS63284397A

    公开(公告)日:1988-11-21

    申请号:JP10744388

    申请日:1988-04-28

    Applicant: CONOCO INC

    Abstract: A method and apparatus for drilling subsea wells in water depths exceeding 3000 feet (preferably exceeding 4000 feet). Drilling mud returns are taken at the seafloor and pumped to the surface by a centrifugal pump (81) that is powered by a seawater driven turbine. A low-differential pressure rotating head (70) seats in the upper tapered portion of the longitudinal throughbore of an upper stack package (60) which is attached to the top of the blowout preventer stack and seals against the drill string (12) as it is run in and out of the borehole. The drilling mud returns are pumped to the surface via a mud return line (82), a conventional riser not being used.

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