Classification of choke and kill manifold and its application in industry
　　Choke and kill manifold is a special well control manifold composed of throttle valve, various valves, manifold and pressure gauge, which is used to control the discharge of annulus fluid and fix the back pressure of well. By injecting clear water, killing fluid and cement slurry into the annulus, the purpose of killing well, waterproofing and extinguishing fire can be achieved. It is an essential equipment in well control operation, especially in well killing operation.
　　Classification of choke and kill manifold
　　Choke and kill manifold is usually divided into manual choke manifold and hydraulic choke manifold. The two commonly used and standby throttle valves of manual throttle manifold are manual throttle valves. In addition to casing pressure gauge, five way valve is also equipped with vertical pressure gauge. The pipeline of vertical pressure gauge is introduced by self-supporting pipe. The common throttle valve of hydraulic throttle manifold adopts hydraulic throttle valve, and its opening is controlled by special hydraulic control box. Manual throttle valve is still used for standby throttle valve.
　　The choke and kill manifold is the necessary equipment to control the pressure of oil and gas wells. In the process of drilling, if overflow or kick occurs when the BOP is closed, open and close the throttle valve in the choke and kill manifold to control the back pressure to maintain the bottom hole pressure. But at present, the height of choke manifold interface is fixed, it is inconvenient to connect oil and gas pipelines with different heights on site, the height adjustment accuracy is poor, and the installation efficiency is low.