Method of disabling and locking open a safety valve with...

Details Method of disabling and locking open a safety valve with... Method of disabling and locking open a safety valve with...

2006-11-21

2006-11-21

Bagnell, David (Department: 3672)

Wells

Processes

Operating valve, closure, or changeable restrictor in a well

C166S316000

Reexamination Certificate

active

07137452

ABSTRACT:
A safety valve has a lock open feature that is actuated by expanding or penetrating the flow tube to disconnect the link between the piston in the hydraulic control system and the flow tube. In normal operation, downward movement of the piston moves the flow tube against a power spring. When the flow tube is expanded, penetrated, or otherwise altered, the piston no longer acts on the flow tube and the flow tube can be simply pushed down and locked in position with the flapper wide open.

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