Pressure controlled reversing valve. [for drill stem test of offshore oil well]
Patent
·
OSTI ID:7316006
In accordance with an illustrative embodiment of the present invention, a pressure controlled reversing valve includes a housing having a flow passage and ports to communicate the passage with the well annulus outside the housing, valve means for normally closing said ports, valve operator means movable upwardly and downwardly in said housing in response to changes in the pressure of fluids in said annulus, lost-motion coupling means for enabling movement of said operator means independently of said valve means so long as said pressure does not exceed a first predetermined value, and means for converting said lost-motion coupling to a driving connection in response to a second pressure in excess of said first pressure to cause said operator to shift said valve means from closed to open position. 22 claims, 8 figures.
- Assignee:
- Schlumberger Technology Corp.
- Patent Number(s):
- US 3986554
- OSTI ID:
- 7316006
- Country of Publication:
- United States
- Language:
- English
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