초록 ▼

A hanger and valve assembly which can be employed as a safety valve assembly to close both the production tubing and the tubing-casing annulus in a subterranean well is disclosed. The assembly includes a hydraulically activated, mechanically locked hanger which has slip anchoring members engaging th

A hanger and valve assembly which can be employed as a safety valve assembly to close both the production tubing and the tubing-casing annulus in a subterranean well is disclosed. The assembly includes a hydraulically activated, mechanically locked hanger which has slip anchoring members engaging the casing or, exterior conduit for preventing movement in both longitudinal directions. The hanger also has annular packing elements to seal the tubing-casing annulus. An annulus safety valve member employing a longitudinally recessed resilient seal member can be mounted in a landing nipple mounted in the hanger. By recessing the seal it is protected from the turbulent flow through the valve. A second shuttle located in the landing nipple is employed in conjunction with the first annulus safety valve to permit flow in one direction while metering flow in the opposite direction. This assembly is especially useful for permitting the injection of treating fluids through the annulus and production through the tubing or inner conduit. A conventional safety valve is employed to prevent flow through the tubing when control pressure is lost or reduced. Both the valves and the hanger can be activated by control fluid pressure through the same control line. A setting sleeve which can be mounted in the annulus safety valve landing nipple prior to installation of the annulus safety valve can be used to permit the hanger to be set using control fluid pressure.

대표청구항 ▼

A valve assembly for use in controlling the flow in an axially extending fluid transmission conduit in a subterranean well to permit relatively greater flow downward in said conduit than upward in said conduit, said valve assembly comprising: first shuttle valve means for opening said conduit in res

A valve assembly for use in controlling the flow in an axially extending fluid transmission conduit in a subterranean well to permit relatively greater flow downward in said conduit than upward in said conduit, said valve assembly comprising: first shuttle valve means for opening said conduit in response to pressure from fluid in said conduit thereabove; a bypass port in said first valve means having a flow area less than the flow area of said first valve means when opened in response to fluid pressure thereabove, said port permitting metered flow through said first valve means when said first valve means is closed; and second surface controlled valve means in said conduit below said first valve means for opening said conduit in response to a control signal other than the pressure of fluid in said conduit, said second valve means being manipulatable between the open and closed positions with said first valve means remaining in the open or closed positions.