Method of drilling sub-sea oil and gas production wells
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United States of America Patent
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Jun 8, 2004
Grant Date -
Apr 3, 2003
app pub date -
Sep 19, 2002
filing date -
Sep 21, 2001
priority date (Note) -
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Abstract
A method of drilling sub-sea oil and gas production wells in which a liquid hydrocarbon substance, such as a natural gas liquid, is injected into the drilling mud supplied to the well in order to reduce the mud density. The method of the present invention enables reduction and control of the hydraulic pressure of the drilling mud while drilling production wells in deep water, thereby to require fewer casing runs which eventually yields better oil productivity.
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