Safety valve hydraulically operated by telescopic drill stem mov

Details Safety valve hydraulically operated by telescopic drill stem mov Safety valve hydraulically operated by telescopic drill stem mov

1977-09-06

1979-02-27

Purser, Ernest R.

Wells

Valves, closures or changeable restrictors

Fluid operated

166332, E21B 4312

Patent

active

041414187

ABSTRACT:
In accordance with an illustrative embodiment of the present invention as disclosed herein, a combination slip joint-safety valve tool includes telescoping mandrel and housing members, a full-opening valve on the housing member operable when closed to prevent upward flow of fluid through said members, and hydraulically operable valve actuator means responsive to contraction of said telescoping members for closing said valve and to extension of said members for opening said valve.

REFERENCES:
patent: 3367422 (1968-02-01), Sims
patent: 3845818 (1974-11-01), Deaton
patent: 3901321 (1975-08-01), Mott

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