Standing and injection valve

Wells – Valves – closures or changeable restrictors – Fluid operated

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Details

1374937, 166325, 166332, E21B 3410

Patent

active

047669608

ABSTRACT:
Standing valves which may be operated as injection valves without removal from a well conduit are disclosed. All disclosed valves permit upward production flow and prevent downward injection flow. One valve form utilizes a ball valve to control production and injection flow, and two valve forms utilize annular valves to control flow. In one annular valve form, production and injection flow is controlled by the annular valve. In the other annular valve form, production flow is controlled by check valve means and injection flow is controlled by the annular valve. These standing valves are opened for injection flow by increasing valve interior fluid pressure to a predetermined pressure to open control check valves permitting the pressured fluid to flow to pressure responsive operators in the valve housings. Opening pressure of the control check valves is variable. When injection pressure is reduced sufficiently, the operators are returned to injection valve closed position by a bias, and operating fluid returns from the operators through other check valves which permit flow from the operators back to the interior of the standing valves.

REFERENCES:
patent: 3066735 (1962-12-01), Zingg
patent: 3524503 (1970-08-01), Baker
patent: 3713490 (1973-01-01), Watson
patent: 3915228 (1975-10-01), Giebeler
patent: 4352366 (1982-10-01), Fisher, Jr.
patent: 4374543 (1983-02-01), Richardson
patent: 4441558 (1984-04-01), Welch et al.
patent: 4494608 (1985-01-01), Williams et al.
patent: 4664195 (1987-05-01), Deaton
patent: 4691777 (1987-09-01), Williamson, Jr.
patent: 4691778 (1987-09-01), Pyne

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