Apparatus and method for managed pressure drilling
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United States of America Patent
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Jan 11, 2011
Grant Date -
May 3, 2007
app pub date -
Oct 20, 2006
filing date -
Oct 20, 2005
priority date (Note) -
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Abstract
A drilling system employing a main tubular having a plurality of fluid inlet and outlet conduits positioned thereon and a concentric inner tubular having a plurality seals for sealing the annular space between the concentric inner and main tubulars. The fluid inlet and outlet conduits work in cooperation with the annular seals to selectively open and close for effective management of pressure within the tubulars.
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