Annulus pressure operated closure valve with reverse circulation valve
Patent
·
OSTI ID:5221093
A closure valve for use in oil well testing is presented which provides a full opening flow passage there-through, and which includes a reverse circulation valve. The closure valve is operated by a power mandrel which is responsive to well annulus pressure, and which is frangibly held in the open position until a predetermined pressure is applied to the fluid in the well annulus. The power mandrel is then frangibly released and moves the closure valve to the closed position. The power mandrel is then disconnected from the closure valve operating mechanism and continues to move to activate a circulation valve opening mechanism. The closure valve includes two normally open ball valves which are spaced apart to trap a sample of formation fluid therebetween when the ball valves are closed.
- Assignee:
- Halliburton Co.
- Patent Number(s):
- US 4064937
- OSTI ID:
- 5221093
- Country of Publication:
- United States
- Language:
- English
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