Underbalanced well completion
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United States of America Patent
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Feb 5, 2002
Grant Date -
May 24, 2001
app pub date -
Jan 2, 2001
filing date -
Sep 8, 1998
priority date (Note) -
In Force
status (Latency Note)
Importance
Abstract
Apparatus and associated methods are provided which facilitate underbalanced drilling and completion of wells. In a described embodiment of a well control valve, the valve is opened and closed when a drill string is displaced therethrough. A shifting device is carried on a drill bit and deposited in the valve when the drill string enters and opens the valve. The valve is closed and the shifting device is retrieved from the valve when the drill string is tripped out of the well. A packer hydraulic setting tool usable in conjunction with the well control valve in underbalanced completions is also provided.
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