Method of forming a subsea borehole from a drilling vessel in a body of water of known depth
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United States of America Patent
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-
Jul 2, 2002
Grant Date -
N/A
app pub date -
May 5, 2000
filing date -
May 5, 1999
priority date (Note) -
In Force
status (Latency Note)
Importance
Abstract
Apparatus and a method are described for drilling with casing in a borehole in a typically unconsolidated formation, wherein the method involves isolating the annulus between the casing and the borehole section from fluid circulation and creating a hydrostatic pressure in the annulus which is adapted to balance any over-pressurized water in the formation.
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