Mechanical lockout for pressure responsive downhole tool
Metal-to-metal high/low pressure seal
Method and apparatus for catching a pump-down plug or ball
Method and apparatus for continuously injecting fluid in a...
Method and apparatus for controlling well pressure in...
Method and apparatus for selective injection or flow control...
Method and apparatus for selective injection or flow control...
Method of mixing fluids in a well bore
Mud check valves in drilling apparatus (wells)
Mudsaver valve
Multi-cycle downhill apparatus
Multi-cycle single line switch
Multi-purpose pressure operated downhole valve
Multi-stage sliding valve fluid operated and pressure balanced
Multicycle hydraulic control valve
Multiple zone downhole intelligent flow control valve system...
Multiple zone downhole intelligent flow control valve system...