Drill pipe tester and safety valve

Details Drill pipe tester and safety valve Drill pipe tester and safety valve

E - Fixed Constructions

21

B

166/41

E21B 43/12 (2006.01) E21B 34/10 (2006.01) E21B 47/10 (2006.01) E21B 34/00 (2006.01)

Patent

CA 1151533

ABSTRACT OF THE DISCLOSURE 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.

371476

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