Subsea pumping system and method for deepwater drilling
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United States of America Patent
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Apr 17, 2001
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N/A
app pub date -
Sep 24, 1998
filing date -
Sep 25, 1997
priority date (Note) -
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Abstract
A method is disclosed for offshore drilling in which a bit is driven at a far end of a drill string, drilling fluid is injected into the drill string from surface drilling facilities, and drilling fluid passes through the far end of the drill string and flushes the borehole at the bit and entrains cuttings into the drilling fluid which circulates up the casing/drill string annulus. The drilling fluid drawn off near the mudline and is treated through a subsea primary processing stage to removing the cuttings from the drilling fluid. The treated drilling fluid is then returned to the surface with a subsea return pump system and passes to surface drilling facilities for injection and recirculation.
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