Combination subsurface safety valve and chemical injector valve

Combination well blowout preventer

Combination well logging device

Combination whipstock and anchor assembly

Combination workover and drilling rig

Combined anti-rotation and flow control tool

Combined casing expansion/ casing while drilling method and...

Combined compressor and separator system and apparatus

Combined development of oil shale by in situ heating with a...

Combined diretional and impact drilling motor

Combined electric-field telemetry and formation evaluation...

Combined fracturing process for stimulation of oil and gas...

Combined fracturing process for stimulation of oil and gas...

Combined ftc support system

Combined gravel packing and perforating method and apparatus...

Combined grip control of elevator and spider slips

Combined impact and pressure liquid rock drill

Combined liner and matrix system

Combined logging and drilling system

Combined metal and elastomer seal