System and method for automatic drilling to maintain equivalent circulating density at a preferred value
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United States of America Patent
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May 16, 2006
Grant Date -
Oct 28, 2004
app pub date -
Apr 25, 2003
filing date -
Apr 25, 2003
priority date (Note) -
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Abstract
A drilling system includes a pressure sensor disposed on a drill string in the wellbore, the sensor responsive to pressure of a drilling fluid disposed in an annular space between a wall of the wellbore and the drill string, and a processor operatively coupled to the pressure sensor. The processor is adapted to operate a drill string release controller to release the drill string into the wellbore so as to maintain an equivalent density of the drilling fluid substantially at a selected value. A method for automatically drilling a wellbore includes measuring pressure of a drilling fluid in an annular space between a wall of the wellbore and a drill string in the wellbore, and automatically controlling a rate of release of the drill string in response to the measured pressure so as to maintain an equivalent density of the drilling fluid substantially at a selected value.
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