Choke and kill control system
A control system is described for a choke and kill safety valve for use in a well conduit, in which the valve indicates a housing having a bore therethrough, a sleeve telescopically movable in the housing about the bore, a valve closure member positioned in the housing and connected to the sleeve and movable between open and closed positions in the bore, a flow tube longitudinally movable in the housing for controlling the movement of the valve closure member, means between the sleeve and the flow tube for biasing the flow tube in a direction for causing the valve closure member to move the closed position, releasable latch means between the sleeve and the flow tube initially holding the flow tube in position holding the valve closure member in the open position, a biased piston and cylinder assembly initially engaging the releasable latch and holding the latch engaged, the assembly being exposed on one side to pressure in the housing, and the housing and the sleeve including openings which when aligned by movement of the sleeve by well pressure allows fluid to be inserted into the bore from the outside of the housing.
- Assignee:
- Camco, Inc., Houston, TX
- Patent Number(s):
- US 4760879
- OSTI ID:
- 7073119
- Resource Relation:
- Patent File Date: Filed date 27 Nov 1987
- Country of Publication:
- United States
- Language:
- English
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