Invention of double base double well casing head device

Rotary control device for underbalanced drilling

Environmental protection closed rotary blowout preventer for underbalanced drilling

New heat injection casing head

New casing head combination tool and wear-resistant bushing

New orifice plate throttle valve

Valve core positioning device of cylindrical throttle valve

Improved screw jacking device for casing head

Driving safety protection device for commercial vehicle

Dual circuit air supply cooling device for commercial vehicle

Power house of rotary control head for underbalanced drilling

Temperature control device of underbalanced drilling power room