Reset and pulling tool for manipulating well safety valve
Patent
·
OSTI ID:5363276
Well tools comprise a go-devil actuated well safety valve, a locking assembly for releasably locking the safety valve at a desired depth in a well, running and pulling tools for installing and removing the safety valve, a go-devil ball for closing the safety valve, and apparatus for dropping the go-devil ball into a well under pressure and for retrieving the ball. The go-devil safety valve is mounted above the locking assembly and includes a trigger-type latch which is released from above by the impact of the go-devil ball. The valve may be reset for reopening the valve without removal of the valve from the well bore by means of special reset and pulling tools disclosed herein. The reset and pulling tools include locking structure for coupling with and release from the safety valve by application of only straight line longitudinal force moving locking surfaces laterally in the tools for locking and unlocking in the safety valve. The go-devil valve is installed in a well, preferably above a storm choke, to shut the well in under emergency conditions which releases the go-devil ball at the surface in response to hazardous conditions such as fire. The go-devil ball drops to the go-devil valve which closes in response to the impact of the ball.
- Assignee:
- Otis Engineering Corp.
- Patent Number(s):
- US 4051899
- OSTI ID:
- 5363276
- Country of Publication:
- United States
- Language:
- English
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