System and method for managed pressure drilling
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United States of America Patent
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Mar 8, 2016
Grant Date -
Jun 13, 2013
app pub date -
Aug 22, 2011
filing date -
Aug 26, 2010
priority date (Note) -
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Abstract
A method for controlling a downhole pressure during drilling comprises continually sensing in real-time at least one real-time fluid property of an input fluid to a well and of a return fluid from the well. A wellhead setpoint pressure is calculated in real-time that results in a predetermined downhole pressure at a predetermined location in the well, where the calculation based, at least in part, on the at least one continually sensed real-time fluid property. The flow of the return fluid is controllably regulated to maintain the calculated wellhead setpoint pressure.
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