Tandem wellbore safety valve apparatus and method of valving in

Details Tandem wellbore safety valve apparatus and method of valving in Tandem wellbore safety valve apparatus and method of valving in

1993-08-16

1994-09-06

Dang, Hoang C.

Wells

Processes

Placing or shifting well part

166321, 166323, 166375, E21B 3410

Patent

active

053439554

ABSTRACT:
A tandem safety valve for use in a tubing string in a wellbore has a pair of identical valves disposed in a valve housing. Each valve has a flow tube for selectively opening and closing each valve. Each valve is provided with an hydraulic normal-operation actuator and an hydraulic looking actuator. The normal-operation actuator and locking actuator are selectively engaged with the flow tube disposed within the valve housing. Each flow tube is provided with a latch to releasably engage the normal-operation actuator, and a a locking dog to selectively engage the flow tube in a locked-open position. The locking actuator engages the latch to release the normal-operation actuator from engagement with the latch and to permit the locking dog to engage the valve housing to maintain the flow tube and valve in a locked-open position.

REFERENCES:
patent: 4273194 (1981-06-01), Pringle et al.
patent: 4407363 (1983-10-01), Akkerman
patent: 4469179 (1984-09-01), Crow et al.
patent: 4475599 (1984-10-01), Akkerman
patent: 4796705 (1989-01-01), Carmody et al.
patent: 4838355 (1989-06-01), Leismer et al.
patent: 4951753 (1990-08-01), Eriksen
patent: 5167284 (1992-12-01), Leismer
Duncan E. Nuttall, "Safety Systems in Subsea Completions", Journal of Petroleum Technology, Jan. 1991, U.S.A.
William A. Blizzard, "The Tandem Safety Valve Solution: Enhancing Subsea Economics", Jun. 1988, Norway.

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