Wells – Processes – Operating valve – closure – or changeable restrictor in a well
Patent
1993-10-08
1996-04-09
Novosad, Stephen J.
Wells
Processes
Operating valve, closure, or changeable restrictor in a well
166122, 166126, 166129, 166142, 166319, 166384, E21B 3410, E21B 33128, E21B 33129, E21B 4312
Patent
active
055052630
ABSTRACT:
A packer set safety valve assembly for controlling annular and tubing flows within a subterranean wellbore is disclosed. The packer set safety valve assembly controls the annular and tubing flows through dual flow paths. The assembly includes a means, that is remotely actuatable, to secure the assembly within the wellbore, a means, also remotely actuatable, the allows selective control of fluid flow in the dual flow paths, and a means, remotely actuatable as well, to unsecure the assembly from within the wellbore. The packer set safety valve assembly is a "fail closed" design which prevents flows through the dual flow paths when the fluid flow control means is not actuated to allow flow.
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patent: 5048610 (1991-09-01), Ross et al.
patent: 5141057 (1992-08-01), Chaix
Crow Robert W.
White Pat M.
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