Valve operating mechanism

Details Valve operating mechanism Valve operating mechanism

1998-03-17

2001-05-15

Will, Thomas B. (Department: 3673)

Wells

Valves, closures or changeable restrictors

Fluid operated

C166S240000, C166S331000

Reexamination Certificate

active

06230807

ABSTRACT:

BACKGROUND
The invention relates to a valve operating mechansim.
In a wellbore, one or more valves can be used to control flow of fluid between different sections of the wellbore. Such valves are typically referred to as formation isolation valves. A formation isolation valve can include a ball valve that is controllable with a shifting tool lowered into the wellbore. For example, the shifting tool can be attached to the end of a tool string (e.g., perforating string). The shifting tool engages a valve operator that is operably coupled to the valve to rotate the valve between the open and close positions.
In addition to use of a shifting tool, such valves can also be operated remotely, such as by application of fluid pressure from the surface to a valve. In addition to valves, other equipment may also be located downhole. Such equipment may also be operable by fluid pressure applied down the wellbore. Thus, a need arises for a mechanism that can prevent actuation of a valve when such fluid pressure is applied to operate the other equipment.
SUMMARY
In general, in one aspect, the invention features an apparatus for operating a valve positioned in a wellbore. The apparatus includes a tubing having a bore and a piston operably coupled to the valve. The piston is moveable from a first position to the second position by predetermined pressure applied from fluid in the tubing bore. A counter mechanism coupled to the piston prevents movement of the piston to the second position until the predetermined pressure has been applied a first number of times.
Other features will become apparent from the following description and from the claims.


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U.S. patent application No. 08/762,762, entitledSurface Controlled Formation Isolation Valve Adapted for Deployment of a Desired Length of a Tool String in Wellbore, filed Dec. 10, 1996.
U.S. patent application No. 09/034,206, entitledInflatable Shifting Tool, filed Mar. 3, 1998.

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