초록 ▼

A mud saver valve for insertion within the drill string to retain mud in the drill pipe and prevent the mud column from flowing past the valve when pumping is interrupted. The valve body has a tubular body and a piston having an axial passage for the flow of drilling mud. This piston is biased withi

A mud saver valve for insertion within the drill string to retain mud in the drill pipe and prevent the mud column from flowing past the valve when pumping is interrupted. The valve body has a tubular body and a piston having an axial passage for the flow of drilling mud. This piston is biased within the body by a spring and axially movable in response to the mud flow. A check valve plug is disposed within the bore which may be removed to run wireline tools. The plug is seated within a reduced diameter portion of the body and includes a replaceable inner sleeve which engages the piston to prevent flow through the valve. The inner sleeve is replaced as it becomes worn due to the erosive forces of the drilling mud.

대표청구항 ▼

In a mud saver valve for retaining drilling mud within a drill string when downhole pumping of the mud is interrupted, the mud saver valve including a tubular housing adapted to be received within the drill string, the housing receiving an upwardly biased, axially movable piston having a fluid passa

In a mud saver valve for retaining drilling mud within a drill string when downhole pumping of the mud is interrupted, the mud saver valve including a tubular housing adapted to be received within the drill string, the housing receiving an upwardly biased, axially movable piston having a fluid passageway to permit the flow of fluids through the valve when the mud is being pumped downhole and a closure plug removably received within the upper end of the mud saver valve, the closure plug including check valve means to permit the upward flow of mud through the mud saver valve to relieve downhole fluid pressure, the improvement comprising: a selectively replaceable inner sleeve supported within the upper end of the mud saver valve by at least one retaining bolt and matingly receiving the removably closure plug, said inner sleeve including a lower end engageable with the piston to prevent the flow of fluid through the fluid passageway.