초록 ▼

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 sur

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.

대표청구항 ▼

A well safety valve comprising: a housing having a bore therethrough; a valve mounted in said housing to open and close to control the flow through said bore; an operator tube in said housing for opening said valve; means in said housing for moving said operator tube in a first direction to open and

A well safety valve comprising: a housing having a bore therethrough; a valve mounted in said housing to open and close to control the flow through said bore; an operator tube in said housing for opening said valve; means in said housing for moving said operator tube in a first direction to open and hold said valve open; means in said housing for moving said operator tube in a second direction to permit said valve to close; a temporary lockout sleeve in said housing in tandem with said operator tube for temporarily holding said valve open, said operator tube and said lockout sleeve being in end-to-end contact when said lockout sleeve is inoperative and said operator tube is holding said valve open, when said operator tube and said lockout sleeve are moving simultaneously in said housing between operating positions, and when said operator tube is inoperative and said lockout sleeve is holding said valve open; and said operator tube and said lockout sleeve each having means for coupling said operator tube and said lockout sleeve with a lockout tool for moving said operator tube and said lockout sleeve simultaneously when said lockout sleeve is moved from said inoperative to an operative position holding said valve open.