Wells – Submerged well – Testing
Patent
1978-07-31
1981-03-03
Lappink, James A.
Wells
Submerged well
Testing
137613, 166 72, 166321, E21B 33035, E21B 4312
Patent
active
042535255
ABSTRACT:
In accordance with an illustrative embodiment of the present invention, a new and improved valve system for retaining production fluids in the subsea production pipe upon disconnection of the riser from the subsea wellhead during a production test of an offshore well includes a normally closed valve releasably connected to a normally open valve. The normally open valve can be hydraulically closed from a remote control station upon disconnection of the riser in order to retain fluids in the production pipe thereabove, and when closed will hold pressure in either longitudinal direction.
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Lappink James A.
Moseley David L.
Schlumberger Technology Corporation
Sherman William R.
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