Apparatus and method to reduce fluid pressure in a wellbore

Details Apparatus and method to reduce fluid pressure in a wellbore Apparatus and method to reduce fluid pressure in a wellbore

2008-07-08

2008-07-08

Tsay, Frank (Department: 3672)

Boring or penetrating the earth

Automatic control

Of fluid pressure below ground

C175S214000

Reexamination Certificate

active

11535419

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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