Well control device is a set of special equipment, instruments and tools set up for the implementation of oil, gas and water well pressure control technology. It is the key device for the prevention, monitoring, control and treatment of blowout accidents. Through the well control device, the controlled construction can be achieved, which can not only reduce the damage to the oil and gas reservoir, but also protect the casing, prevent blowout and blowout out of control, and realize the operation.

　　The well control device mainly solves the following basic problems: first, the sealing problem, that is, to ensure that the annular space of tubing and oil casing does not leak when shut in due to kick and blowout during downhole operation; second, the pressurization problem, that is, to control the jacking of tubing when the jacking force of downhole pressure on tubing exceeds the gravity of tubing itself during tripping string operation; third, the throttling and killing problem In the process of downhole operation, it is necessary to ensure that the well killing measures can be successfully implemented under different working conditions.
　　Well control device is mainly composed of testing equipment, control equipment and processing equipment. The testing equipment includes: gas measuring equipment, liquid level measuring instrument, densimeter and viscometer; the control equipment includes: blowout preventer, internal blowout preventer and oil (gas) tree; the processing equipment includes: choke manifold, kill manifold, degasser, drainage and blowout device, surface pressurization and other auxiliary equipment.