Wells – Means for guiding insertable element laterally of well axis
Patent
1981-01-05
1984-06-19
Pate, III, William F.
Wells
Means for guiding insertable element laterally of well axis
166 72, 166322, 166324, E21B 3410
Patent
active
044549130
ABSTRACT:
In accordance with an illustrative embodiment of the present invention, a surface controlled subsurface safety valve system includes a tubing retrievable safety valve having a valve element that is opened and held open in response to the pressure of a control fluid in a control line and automatically closed when control pressure is reduced, and means for equalizing the pressure of fluids above and below said valve element to aid in reopening the same after closure, including a wireline retrievable equalizing valve removably installed in the pocket of a side pocket mandrel that is connected in the tubing above said safety valve, said equalizing valve being arranged to be opened and closed in response to changes in the pressure of said control fluid. A uniquely constructed side pocket mandrel also is disclosed.
REFERENCES:
patent: 3059700 (1962-10-01), Loy et al.
patent: 3666012 (1972-05-01), Sizer et al.
patent: 3874445 (1975-04-01), Terral
patent: 3882935 (1975-05-01), Calhoun
patent: 4031955 (1977-06-01), Leder
patent: 4031960 (1977-06-01), Dudley
patent: 4119146 (1978-10-01), Taylor
patent: 4325431 (1982-04-01), Akkerman
Guidry Shelby L.
Jernigan Kerry D.
Pate III William F.
Schlumberger Technology Corporation
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