Pressure and flow control in drilling operations
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United States of America Patent
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Oct 9, 2012
Grant Date -
Jun 16, 2011
app pub date -
Dec 15, 2009
filing date -
Dec 19, 2008
priority date (Note) -
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status (Latency Note)
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Abstract
A well drilling system for use with a drilling fluid pump includes a flow control device regulating flow from the pump to a drill string interior; 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 the drill string interior; and the flow dividing step including permitting flow through another flow control device interconnected between the pump and the annulus, while flow is permitted through the first flow control device.
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