Riser isolation device having automatically operated annular seal
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United States of America Patent
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May 30, 2017
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N/A
app pub date -
Sep 25, 2015
filing date -
Sep 25, 2015
priority date (Note) -
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Abstract
A device for control of return flow from a borehole, wherein drilling fluid is supplied from a drilling platform through a drill string disposed in a borehole includes an annulus formed between a pipe and the drill string. The annulus is in fluid communication with or forms part of a return path for the drill fluid. A choke is positioned in the annulus. An automatically operated annular seal element is disposed in the pipe above the drill fluid return path. The automatically operated annular seal element is configured to close the annulus to fluid communication when at least one of a predetermined fluid flow rate in the pipe and a predetermined pressure differential across the automatically operated annular seal element is reached.
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