Use of downhole pressure measurements while drilling to detect and mitigate influxes
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United States of America Patent
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Aug 8, 2017
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app pub date -
Nov 5, 2012
filing date -
Nov 30, 2011
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Abstract
A well drilling system can include a hydraulics model which determines a modeled fluid friction pressure and a calibration factor applied to the modeled friction pressure, and a flow control device which is automatically controlled in response to a change in the calibration factor. A well drilling method can include drilling a wellbore, a fluid circulating through the wellbore during the drilling, determining a calibration factor which is applied to a modeled fluid friction pressure, and controlling the drilling based at least in part on a change in the calibration factor.
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