Tool for closing a well tubing

Details Tool for closing a well tubing Tool for closing a well tubing

1987-09-17

1988-07-12

Novosad, Stephen J.

Wells

Valves, closures or changeable restrictors

Fluid operated

166332, 166373, 166385, E21B 3414

Patent

active

047563729

ABSTRACT:
The invention relates to a tool having a valve (3c, 4c) for closing the tubing (100) of a well into which the tool has been placed. The valve member (4c) is controlled by means of a traction cable (17) via a hydraulic mechanism having two piston-and-cylinder assemblies (4b, 5e, 45; 1g, 4a, 41) which reduce the force applied on the valve member (4c) by the pressure of the fluid in the well and which amplify the force (f) applied thereto by the cable (17) in order to open said valve member.

REFERENCES:
patent: 2033563 (1936-03-01), Wells
patent: 2962099 (1960-11-01), Clark, Jr.
patent: 3115188 (1963-12-01), Cochian et al.
patent: 3448803 (1969-06-01), Sizer
patent: 3703104 (1972-11-01), Tamplen
patent: 3735813 (1973-05-01), Mack

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