Pressure and flow control in drilling operations
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United States of America Patent
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Jul 14, 2015
Grant Date -
Nov 15, 2012
app pub date -
Apr 10, 2012
filing date -
May 9, 2011
priority date (Note) -
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status (Latency Note)
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Abstract
A well drilling system includes a flow control device regulating flow from a rig pump to a drill string, the flow control device being interconnected between the pump and a standpipe manifold, and another flow control device regulating flow through a line in communication with an annulus. Flow is simultaneously permitted through the flow control devices. A method of maintaining a desired bottom hole pressure includes dividing drilling fluid flow between a line in communication with a drill string interior and a line in communication with an annulus; the flow dividing step including permitting flow through a flow control device interconnected between a pump and a standpipe manifold.
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