Subsurface safety valve with lock-open system

Details Subsurface safety valve with lock-open system Subsurface safety valve with lock-open system

E - Fixed Constructions

21

B

166/41

E21B 34/12 (2006.01) E21B 34/10 (2006.01) E21B 34/00 (2006.01)

Patent

CA 1238269

SUBSURFACE SAFETY VALVE WITH LOCK OPEN SYSTEM Abstract of the Disclosure A surface controlled subsurface well safety valve for use in a well tubing string including a flapper valve member, an operator tube for opening the flapper valve member and holding it open, an annular piston on the opera- tor tube operative in response to control fluid pressure conducted from the surface, a spring biasing the operator tube to a position at which the flapper valve is closed, and a temporary lockout sleeve mounted in tandem with the flapper valve operator tube for movement simultaneously with the operator tube to a position at which the operator tube is inoperative and the temporary sleeve holds the flapper valve open, the operator tube and flapper valve having means for engagement of a lockout tool to operate the operator tube and lockout sleeve simultaneously. The lockout sleeve can be returned to inoperative position by control fluid pressure return of the operator tube to a position in which the tube holds the flapper valve open. The safety valve is operable with a single trip of a wireline device supporting the lockout tool. The lockout includes selective operating keys and a separate expandable latch ring for simultaneous coupling of the operator tube and the temporary lockout sleeve of the safety valve with the lockout tool.

488573

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