Air and mud control system for underbalanced drilling
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United States of America Patent
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Feb 23, 1999
Grant Date -
N/A
app pub date -
May 27, 1997
filing date -
May 27, 1997
priority date (Note) -
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status (Latency Note)
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Abstract
A method and apparatus for drilling a well is set forth. In one aspect, a typical drill stem is assembled from a set of drill pipe and delivers a flow of drilling mud to the drill bit. A smaller tubing string is placed on the interior and connects to a mixing valve just above the drill bit. A gas flow is placed in the tubing which flows to the mixing valve where the gas is mixed in a desired ratio with the drilling mud so the mud weight is reduced, and thereby enables drilling, at a faster rate with an underbalanced condition. Steps are set forth in which the pressure is changed to an overbalanced condition.
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