Wells – Valves – closures or changeable restrictors – Fluid operated
Patent
1979-09-13
1981-06-23
Purser, Ernest R.
Wells
Valves, closures or changeable restrictors
Fluid operated
137509, E21B 3408
Patent
active
042744903
ABSTRACT:
In oil well remedial operations, a powerful generally acidic solution is pumped down a pipestring and out into the well annulus at the level of casing perforations wherein the solution will pass through the perforations and clean them out to facilitate oil flow into the annulus for subsequent recovery. When increasing the depth of the pipe string as by adding further pipe sections at the surface of the well, it is desirable to retain the solution within the pipe string and towards this end, there is provided an internal fluid control valve normally closed to retain fluid but responsive to an increase in the fluid pressure above a given value to open and permit the treating fluid to pass into the annulus and treat the casing perforations. Basically the internal valve comprises a valve seat and ball, the ball being positioned on the upstream side of the valve so that should any seals fail in the valve structure, the valve will failsafe to a closed position.
REFERENCES:
patent: 480528 (1892-08-01), Thoms
patent: 3106932 (1963-10-01), Chsholm
patent: 4063594 (1977-12-01), Canterbury
Pastoriza Ralph B.
Purser Ernest R.
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