Shut-in tools
Patent
·
OSTI ID:6291921
A downhole shut-in valve apparatus is described for shutting in a tubing string of a well, comprising: a housing having a housing bore and having a flow port means defined through said housing for communicating said housing bore with an interior of said tubing string to allow fluid flow into said flow port means and up through said housing bore, said housing having a low pressure zone defined therein; a shut-in valve element disposed in said housing bore and movable between an open position wherein said flow port means is open and a closed position wherein said flow port means is closed; a differential pressure actuating piston having first and second sides, said piston being operably associated with said shut-in valve element to move said shut-in valve element between its open and closed positions in response to movement of said actuating piston; and pilot valve means, for communicating said actuating piston with said interior of said tubing string so that a pressure differential between said interior of said tubing string and said low pressure zone moves said actuating piston and thus moves said shut-in valve element to its said closed position.
- Assignee:
- Halliburton Co., Duncan, OK (United States)
- Patent Number(s):
- US 5234057; A
- Application Number:
- PPN: US 7-868832
- OSTI ID:
- 6291921
- Country of Publication:
- United States
- Language:
- English
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