SUBSURFACE SAFETY VALVE WITH LOCK-OPEN SYSTEM

摘要

SUBSURFACE SAFETY VALVE WITH LOCK OPEN SYSTEM 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 operator 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.