Surface controlled subsurface safety valve

Details Surface controlled subsurface safety valve Surface controlled subsurface safety valve

E - Fixed Constructions

21

B

166/41

E21B 34/14 (2006.01) E21B 34/10 (2006.01) E21B 34/00 (2006.01)

Patent

CA 1265995

ABSTRACT SURFACE CONTROLLED SUBSURFACE SAFETY VALVE A surface controlled subsurface safety valve for use in a well tubing string includes a valve closure member 31, an operator tube 40 for opening the valve closure member 31 and holding it open, an annular piston 42 on the operator tube 40 operative in response to control fluid pressure conducted from the well surface, a spring 44 biasing the operator tube 40 to a position at which the valve 31 is closed, and a lockout sleeve 50 mounted in tandem with the operator tube 40 for movement simultaneously with the operator tube 40 to a position at which the lockout sleeve 50 holds the valve 31 open. The operator tube 40 and lockout sleeve 50 are engageable by a shifting tool 70, to operate the operator tube 40 and lockout sleeve 50 simultaneously. The lockout sleeve SO can he returned to an inoperative position by control fluid pressure moving the operator tube 40 to a position which opens the valve closure member 31. The safety valve is also operable by a modified shifting tool engag- ing the operator tube. The shifting tool includes select- ive keys 76 and separate expandable latch dogs 100 for simultaneous coupling of the operator tube 40 and the lockout sleeve 50.

524465

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