Drill pipe tester and safety valve

Wells – Valves – closures or changeable restrictors – Longitudinally movable operator

Patent

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Details

166331, 166237, E21B 3412

Patent

active

044200455

ABSTRACT:
A drill pipe tester valve includes a spherical valve member supported from an upward facing surface of a housing so that downward forces exerted on the valve member in its closed position, due to fluid pressure in a string of pipe above the valve member, are transmitted substantially entirely to said housing. A latching device is provided for latching the spherical valve member in its closed position as the string of pipe and tester valve are lowered into a well and for subsequently releasing the spherical valve member and allowing it to move to its open position when the string of pipe and tester valve are finally positioned within the well. Additionally, a spring is utilized to control the closing of the equalization port in the drill pipe tester valve in order to provide a positive indication of the closing of the equilization port and to eliminate the use of a J-slot positioning means and cooperating lug.

REFERENCES:
patent: Re27464 (1972-08-01), Taylor, Jr.
patent: Re29471 (1977-11-01), Giroux
patent: 3568715 (1971-03-01), Taylor, Jr.
patent: 3856085 (1974-12-01), Holden et al.
patent: 3967647 (1976-07-01), Young
patent: 4009753 (1977-03-01), McGill et al.
patent: 4064937 (1977-12-01), Barrington
patent: 4116272 (1978-09-01), Barrington
patent: 4295361 (1981-10-01), McMahan
patent: 4319633 (1982-03-01), McMahan et al.
patent: 4319634 (1982-03-01), McMahan et al.

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