Apparatus for and method of drilling a subterranean borehole
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United States of America Patent
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Jun 9, 2015
Grant Date -
Apr 19, 2012
app pub date -
Mar 31, 2010
filing date -
Apr 1, 2009
priority date (Note) -
In Force
status (Latency Note)
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Abstract
A control apparatus for use in controlling the fluid pressure in a borehole during drilling of the borehole, the apparatus including an inlet suitable for connection to a pump, a main outlet suitable for connection to a drill pipe, and an overflow outlet suitable for connection to a fluid reservoir, the inlet being connected to the main outlet by a main flow conduit, and the overflow outlet being connected to the main flow conduit by means of an overflow conduit, wherein the overflow conduit is provided with a pressure regulator by means of which the pressure of fluid in the main flow conduit may be maintained at or around a predetermined pressure value.
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