Wells – Valves – closures or changeable restrictors – Fluid operated
Patent
1992-07-10
1993-08-31
Bui, Thuy M.
Wells
Valves, closures or changeable restrictors
Fluid operated
166 55, E21B 3400
Patent
active
052400719
ABSTRACT:
A travelling valve assembly utilizing a length of tubing, longer than the production screen, positioned at the end of a wash pipe and lowered into the tubing bore so that the lower end of the tubing is a depth below the production screen. When gravel packing is concluded, the tubing is then placed in position by raising the wash pipe and tubing to the upper seal bore. The wash pipe is then sheared from the tubing assembly. The tubing includes seals at each end, which seat in respective seal bores, for sealing off above and below the production screen. There is further provided a valving mechanism, such as a sliding door valve which is operable from the surface between open and closed positions. While the valving mechanism is closed, the production flow is prevented; however, upon opening the valve through a wire line or shifting tool, production flows through the sliding door valve and up to the surface through the tubing. In an additional embodiment, rather than include a valve in the wall of the tubing, a mechanical perforator would be lowered into the tubing and mechanically perforate the wall of the tubing for allowing the production to commence. An yet another embodiment, rather than using an isolation pipe member suspended from the valve assembly, there would be included the second length of tubing such as wash pipe, suspended from the assembly.
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Farley David L.
Shaw, Jr. C. Raymond
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