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

2005-01-04

2005-01-04

Tsay, Frank (Department: 3672)

Boring or penetrating the earth

Automatic control

Of fluid pressure below ground

C175S217000, C166S065100

Reexamination Certificate

active

06837313

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.

REFERENCES:
patent: 1892217 (1932-12-01), Moineau
patent: 4049066 (1977-09-01), Richey
patent: 4063602 (1977-12-01), Howell et al.
patent: 4291772 (1981-09-01), Beynet
patent: 4430892 (1984-02-01), Owings
patent: 4534426 (1985-08-01), Hooper
patent: 4583603 (1986-04-01), Dorleans et al.
patent: 4630691 (1986-12-01), Hooper
patent: 4744426 (1988-05-01), Reed
patent: 4813495 (1989-03-01), Leach
patent: 5339899 (1994-08-01), Ravi et al.
patent: 5355967 (1994-10-01), Mueller et al.
patent: 5651420 (1997-07-01), Tibbitts et al.
patent: 5720356 (1998-02-01), Gardes
patent: 5842149 (1998-11-01), Harrell et al.
patent: 6065550 (2000-05-01), Gardes
patent: 6138774 (2000-10-01), Bourgoyne et al.
patent: 6257333 (2001-07-01), Mann et al.
patent: 6374925 (2002-04-01), Elkins et al.
patent: WO 0004269 (2000-01-01), None
patent: WO 0008293 (2000-02-01), None
patent: WO 0050731 (2000-08-01), None
patent: WO 0214649 (2002-02-01), None
patent: WO 03023182 (2003-03-01), None
patent: WO 03025336 (2003-03-01), None
Forrest, et al., “Subsea Equipment for Deep Water Drilling Using Dual Gradient Mud System,” SPE/ADC Drilling Conference, Amsterdam, The Netherlands, Feb. 27, 2000-Mar. 1, 2001, 8 pages.
PCT International Search Report, International Application No. PCT/US 03/16686, dated Aug. 21, 2003.

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