Internal fluid control valve for use in oil well remedial operations
Patent
·
OSTI ID:6105676
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.
- Assignee:
- IFI; EDB-82-000429
- Patent Number(s):
- US 4274490
- OSTI ID:
- 6105676
- Country of Publication:
- United States
- Language:
- English
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