Mud saver valve

Details Mud saver valve Mud saver valve

2006-03-28

2006-03-28

Walker, Zakiya (Department: 3676)

Wells

Processes

Placing or shifting well part

C166S108000, C166S321000, C166S325000, C175S318000

Reexamination Certificate

active

07017671

ABSTRACT:
A mud saver valve being operable in conjunction with a top drive unit to retain mud in the top drive unit when a tubular is disconnected therefrom. The valve utilizes a spring-loaded piston to control the flow of mud or other fluid onto the work area and environment while the top drive unit is being connected to the new tubular and re-connected to the original tubular string. The valve further comprises multiple check valves for evaluating as well as monitoring wellbore pressure. The valves provides for full bore flow passages for the mud or fluid being pumped into a tubular fluidly connected to the top drive.

REFERENCES:
patent: 3698411 (1972-10-01), Garrett
patent: 4768598 (1988-09-01), Reinhardt
patent: 6487960 (2002-12-01), Chatufale
patent: 2001/0042625 (2001-11-01), Appleton

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