Dynamic annular pressure control apparatus and method
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United States of America Patent
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Mar 6, 2007
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app pub date -
Feb 10, 2004
filing date -
Feb 20, 2002
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Abstract
A drilling system for drilling a bore hole into a subterranean earth formation, wherein at least a portion of the mud flow from the primary mud pump is diverted to the mud discharge outlet, thereby creating a backpressure system to readily increase annular pressure.
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