Variable flow sliding sleeve valve and positioning shifting tool

Details Variable flow sliding sleeve valve and positioning shifting tool Variable flow sliding sleeve valve and positioning shifting tool

1991-12-31

1993-05-18

Melius, Terry Lee

Wells

Valves, closures or changeable restrictors

Longitudinally movable operator

166320, E21B 3414

Patent

active

052112411

ABSTRACT:
A sliding sleeve valve useful in a flow conduit to control and vary area of openings open for flow through the valve. The valve has a sleeve having a through flow passage and the sleeve is moveable between open, intermediate and closed positions. When the sleeve is in open position, the area open for flow through the valve is equal to area through the sleeve flow passage. As the sleeve is moved from open position to intermediate positions toward closed position, the area open for flow at each position is reduced to no area open for flow at closed position and conversely. Also disclosed is a pressure operated shifting tool which when lowered into the sleeve valve selectively locates in the valve, engages the sleeve, moves the sleeve upwardly or downwardly between positions and automatically disengages from the sleeve for retrieval. The invertible shifting module in the shifting tool is provided with a positioning sleeve which determines the distance the sleeve is moved when the shifting tool is operated. The shifting tool also includes structure for disengaging the sleeve valve if the shifting tool cannot move the sleeve or does not automatically disengage after operation and an emergency disconnect which may be operated to disconnect the flow conduit used to lower the shifting tool.

REFERENCES:
patent: 3552718 (1971-01-01), Schwegman
patent: 4603740 (1986-08-01), Edwards et al.
patent: 4838349 (1989-06-01), Berzin
patent: 4842074 (1989-06-01), Hines et al.

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