Shifting apparatus and method

Wells – Processes – Operating valve – closure – or changeable restrictor in a well

Reexamination Certificate

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C166S334100

Reexamination Certificate

active

07617875

ABSTRACT:
A device for shifting a sliding sleeve. The sliding sleeve is concentrically positioned within a well, and wherein the well is in communication with a hydrocarbon reservoir. In the most preferred embodiment, the device comprises an outer housing forming an annulus with the well and a power piston slidably disposed within the outer housing. The power piston includes an upper shoulder configured to form an annular chamber and a tubular chamber relative to the outer housing, a lower shoulder configured to form an atmospheric chamber relative to the outer housing. The device further comprises a first latch for preventing upward movement of the power piston, a second latch for preventing downward movement of the power piston, and wherein movement of the power piston shifts the sliding sleeve.

REFERENCES:
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patent: 4716963 (1988-01-01), George et al.
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patent: 5156207 (1992-10-01), Haugen et al.
patent: 6397949 (2002-06-01), Walker et al.
patent: 6659186 (2003-12-01), Patel
patent: 7152678 (2006-12-01), Turner et al.
patent: 7290617 (2007-11-01), Popilian et al.
patent: 7322417 (2008-01-01), Rytlewski et al.
patent: 2005/0056430 (2005-03-01), Dennistoun et al.
Halliburton Brochure—Subsurface Flow Control Systems—section 6, pp. 30-33.
BJ Services Company Brochure—Multi-Service Valve Product Information (2 pages).

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