Wells – Valves – closures or changeable restrictors – Fluid operated
Patent
1977-09-26
1978-12-19
Purser, Ernest R.
Wells
Valves, closures or changeable restrictors
Fluid operated
166330, E21B 4312
Patent
active
041301668
ABSTRACT:
An improvement in a lubricator apparatus for use in installation of drilling, completion, workover tools, or parts thereof for subsequent use in a subterranean well and for control of fluids through said well, the lubricator having therein a valve assembly comprising a longitudinally shiftable carriage, a ported valve head rotatable on said valve seat means between closed and opened positions by said carriage to control flow of fluids through said well and through said lubricator apparatus. Improvement comprises a differential sleeve longitudinally movable immediate the valve assembly and is sealingly engageable upon the exterior of the ported valve head when the valve assembly is in closed position. The sleeve is sealingly disengageable from the ported valve head when the assembly is in opened position and is urgeable to sealing engagement upon the ported valve head in response to pressure differential across the valve assembly, with the sleeve being in frictionless relationship with the ported valve head in absence of pressure differential across the valve assembly. Reference pressure operated means in conduit communication with said valve assembly are provided for rendering the valve assembly insensitive to hydrostatic pressure at the depth of the operation of the valve assembly and further enabling control pressure to rotate the ported valve head operatively independent of well pressure.
REFERENCES:
patent: 3830297 (1974-08-01), Cockrell
patent: 3971438 (1976-07-01), Crowe
Akkerman Neil H.
Ross Richard J.
Baker International Corporation
Norvell, Jr. William C.
Purser Ernest R.
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