Tool for closing a well tubing

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

1988-01-20

1990-07-31

Novosad, Stephen J.

Wells

Processes

Operating valve, closure, or changeable restrictor in a well

166319, 166325, 166332, 166385, E21B 3414

Patent

active

049443500

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), Welk
patent: 2373648 (1945-04-01), Boynton et al.
patent: 2962099 (1960-11-01), Clark, Jr.
patent: 3115188 (1963-12-01), Cochian et al.
patent: 3381753 (1968-05-01), Fredd
patent: 3448803 (1969-06-01), Sizer
patent: 3703104 (1972-11-01), Tamplen
patent: 3735813 (1973-05-01), Mack
patent: 4059157 (1977-11-01), Crowe
patent: 4252188 (1981-02-01), Fredd
patent: 4399871 (1983-08-01), Adkins et al.
patent: 4756372 (1988-07-01), Airey

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