ASSEMBLY AND METHOD FOR SUBSEA WELL DRILLING AND INTERVENTION
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United States of America Patent
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Issued Date -
Jun 2, 2011
app pub date -
Dec 2, 2010
filing date -
Dec 2, 2009
priority date (Note) -
Abandoned
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Abstract
An assembly suitable for subsea drilling and intervention operations includes a dual blow out preventer system having an upper blow out preventer located between a drill floor and a riser string, and a lower blow out preventer located below the riser string and above a wellhead. The dual BOP system is adapted to enable advanced drilling and intervention operations such as Managed Pressure Drilling (“MPD”), Underbalanced Drilling (“UBD”), or Through Tubing Rotary Drilling (“TTRD”) in an offshore deepwater environment.
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