Dual-pump injection device and method for carbon dioxide oil recovery machine

Rotating assembly device with quickly detachable and attachable seals

Environmentally friendly enclosed rotary blowout preventer for underbalanced drilling

Underbalanced drilling rotary control device

Double-base double-well casing head device

Intelligent feedback control electric drilling valve

Direct-through manual needle throttle valve

Electric wedge throttle valve for fine pressure control drilling

A metal-sealed thermal recovery casing head

Hydraulic fine pressure control throttle valve

New heat injection casing head

New casing head assembly tool and wear-resistant bushing