Apparatus and method to reduce fluid pressure in a wellbore
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United States of America Patent
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Jan 4, 2005
Grant Date -
Aug 7, 2003
app pub date -
May 28, 2002
filing date -
Jan 8, 2002
priority date (Note) -
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Abstract
The present invention generally provides apparatus and methods for reducing the pressure of a circulating fluid in a wellbore. In one aspect of the invention an ECD (equivalent circulation density) reduction tool provides a means for drilling extended reach deep (ERD) wells with heavyweight drilling fluids by minimizing the effect of friction head on bottomhole pressure so that circulating density of the fluid is close to its actual density. With an ECD reduction tool located in the upper section of the well, the friction head is substantially reduced, which substantially reduces chances of fracturing a formation.
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