Annulus pressure controlled test valve with locking annulus pres

Details Annulus pressure controlled test valve with locking annulus pres Annulus pressure controlled test valve with locking annulus pres

1977-07-21

1978-11-14

Purser, Ernest R.

Wells

Valves, closures or changeable restrictors

Fluid operated

166264, E21B 4312, E21B 4700

Patent

active

041251652

ABSTRACT:
Well test apparatus having, in a well, an annulus therearound. An annular housing has a valve for the control of fluid flow through the housing. A pressure chamber is provided within the housing. Lockable pressure trapping means is responsive to annulus pressure for locking in a condition wherein pressure is trapped in the pressure chamber. A piston is responsive to trapped pressure in the pressure chamber and to annulus pressure for control of the valve.

REFERENCES:
patent: 3856085 (1974-12-01), Holden et al.
patent: 3858649 (1975-01-01), Wray et al.
patent: 3964544 (1976-06-01), Farley et al.
patent: 3976136 (1976-08-01), Farley et al.

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