Portable drill string compensator

Details Portable drill string compensator Portable drill string compensator

2006-11-07

2006-11-07

Bagnell, David (Department: 3672)

Wells

Submerged well

Means removably connected to permanent well structure

C405S224200, C405S224300

Reexamination Certificate

active

07131496

ABSTRACT:
A closed system drill string compensator having a hydraulic fluid accumulator, at least one air pressure vessel, and a piston and a piston rod slidably engaged within a cylinder. The drill string compensator provides tensioning force for supporting a drill string and permits the drilling vessel to remain connected to the drill string during ocean level changes caused by wave action or ocean heave. In one embodiment, the accumulator surrounds the cylinder and at least one air pressure vessel is radially disposed around the accumulator and the cylinder. In another embodiment, the accumulator surrounds the cylinder and includes two ports, one port for permitting fluid communication between the cylinder and the accumulator and a second port for permitting fluid communication between the accumulator and the air pressure vessel, the first port including a shut-off valve disposed therein. Methods of compensating a drill string are also disclosed.

REFERENCES:
patent: 4449854 (1984-05-01), Nayler
patent: 4799827 (1989-01-01), Jaqua
patent: 4883387 (1989-11-01), Myers et al.
patent: 5392853 (1995-02-01), Toon
U.S. Appl. Ser. No. 10/314,747, filed Dec. 9, 2002, last amended May 23, 2005.

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