Wells – Valves – closures or changeable restrictors – Fluid operated
Patent
1986-04-07
1987-09-08
Novosad, Stephen J.
Wells
Valves, closures or changeable restrictors
Fluid operated
166332, E21B 3700
Patent
active
046917772
ABSTRACT:
Two forms of a valve, both useful as a standing valve in a well conduit, permitting upward production flow and preventing downward injection flow. Both forms of this valve may also be operated as injection valves, permitting downward injection flow and preventing upward production flow. One form of the valve utilizes a ball valve for flow control and can be converted to injection only valve operation. The other form of the control valve utilizes an annular valve for flow control and cannot be converted to injection valve only operation. The annular valve and ball valve are biased closed, and both are opened for downward injection flow by increasing valve interior pressure to a pressure which will open a control check valve to permit opening flow to a pressure responsive operator. Opening pressure of the check valve is variable and may be predetermined. When injection flow is reduced sufficiently and the operator is being returned to valve closed position by the bias, opening fluid flow volume returns to the valve interior through other wall flow passages, which provide a larger flow area. Each other flow passage has a check valve permitting flow from the operator back to the valve interior.
REFERENCES:
patent: 3845815 (1974-11-01), Garwood
patent: 4352366 (1982-10-01), Fisher, Jr.
patent: 4467870 (1984-08-01), Langham
patent: 4475598 (1984-10-01), Brakhage, Jr. et al.
patent: 4569397 (1986-02-01), Brakhage, Jr. et al.
patent: 4573535 (1986-03-01), Manke
patent: 4589495 (1986-05-01), Langer et al.
Cox Roland O.
Novosad Stephen J.
Oda Thomas J.
Otis Engineering Corporation
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