Subsurface measurement apparatus, system, and process for...
Subsurface probe system for chemical and mineral exploration
Subsurface release cementing plug apparatus and methods
Subsurface safety valve
Subsurface safety valve
Subsurface safety valve
Subsurface safety valve
Subsurface safety valve
Subsurface safety valve actuation pressure amplifier
Subsurface safety valve apparatus
Subsurface safety valve of minimized length
Subsurface safety valve system with hydraulic packer
Subsurface safety valve with improved balancing valve means
Subsurface safety valve with lock-open system
Subsurface signal transmitting apparatus
Subsurface transient pressure testing apparatus
Subsurface valve
Subsurface well apparatus and method
Subsurface well apparatus having flexing means and method of...
Subsurface well bore packing element