Arrangement and method for regulating bottom hole pressures when drilling deepwater offshore wells
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United States of America Patent
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-
Sep 4, 2007
Grant Date -
Dec 2, 2004
app pub date -
Sep 10, 2002
filing date -
Sep 10, 2001
priority date (Note) -
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status (Latency Note)
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Abstract
An arrangement and a method to control and regulate the bottom hole pressure in a well during subsea drilling at deep waters: The method involves adjustment of a liquid/gas interface level in a drilling riser up or down. The arrangement comprises a high pressure drilling riser and a surface BOP at the upper end of the drilling riser. The surface BOP havs a gas bleeding outlet. The riser also comprises a BOP, with a by-pass line. The drilling riser has an outlet at a depth below the water surface, and the outlet is connected to a pumping system with a flow return conduit running back to a drilling vessel/platform.
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