Downhole tool

Details Downhole tool Downhole tool

1996-07-05

1999-04-06

Neuder, William

Wells

Valves, closures or changeable restrictors

Fluid operated

1663322, E21B 3410

Patent

active

058905405

ABSTRACT:
A downhole tool comprises a tubular body (12) for location in a tubular member, such as a drill string, and defines a through bore (20) and a number of circumferentially spaced ports (26). A valve member which may be in the form of a piston sleeve (24) is mounted in the bore (20) and is movable relative to the body (12) between a first position in which fluid may flow through the port (26) and a second position in which the valve member (24) closes the port (26), the valve member being movable between the first and second positions by application of differential fluid pressure. Movement of the valve member (24) is provided by a cam arrangement including a circumferentially extending cam groove (56) and a cam follower (57).

REFERENCES:
patent: 4298077 (1981-11-01), Emery
patent: 4403659 (1983-09-01), Upchurch
patent: 4657082 (1987-04-01), Ringgenberg
patent: 4669541 (1987-06-01), Bissonnette

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