Pump open safety valve and method of use

Details Pump open safety valve and method of use Pump open safety valve and method of use

1985-02-08

1986-10-21

Novosad, Stephen J.

Wells

Processes

Operating valve, closure, or changeable restrictor in a well

166317, 166319, E21B 3406

Patent

active

046180001

ABSTRACT:
A downhole safety valve has a ball valve element which is closed in response to an increase in well annulus pressure and which may be re-opened in response to an increase in tubing pressure.

REFERENCES:
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patent: 3970147 (1976-07-01), Jessup et al.
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patent: 4064937 (1977-12-01), Barrington
patent: 4160484 (1979-07-01), Watkins
patent: 4270610 (1981-06-01), Barrington
patent: 4403659 (1983-09-01), Upchurch
patent: 4441558 (1984-04-01), Welch et al.
patent: 4530485 (1985-07-01), Yonker et al.

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