Mud saver valve with increased flow check valve

Details Mud saver valve with increased flow check valve Mud saver valve with increased flow check valve

1989-02-01

1990-09-11

Hepperle, Stephen M.

Fluid handling

Destructible or deformable element controlled

Destructible element

137327, 1374939, 137515, 166317, 166325, F16K 1740

Patent

active

049559494

ABSTRACT:
A mud saver valve for insertion within the drill string to retain mud in the drill pipe preventing the mud column from flowing past the valve when pumping is interrupted. The mud saver valve includes an internal check valve which permits increased flow of mud upward through the valve when a predetermined downhole pressure is reached. The increased flow of the check valve prevents a blow-out of the plug spear in the event sudden upward pressure is encountered. The check valve forms a part of the plug spear which is removable from the mud saver valve to facilitate the running of wireline tools.

REFERENCES:
patent: 3698411 (1972-09-01), Garrett
patent: 3965980 (1976-06-01), Williamson
patent: 3967679 (1976-07-01), Liljestrand
patent: 4128108 (1978-12-01), Parker et al.
patent: 4364407 (1982-12-01), Hilliard
patent: 4625755 (1986-12-01), Reddoch
patent: 4658905 (1987-04-01), Burge
patent: 4779688 (1988-09-01), Baugh

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