How to use choke and kill manifold?

　　Location of choke and kill manifold: when the person faces the gate of the derrick, the choke manifold is installed on the right side of the wellhead cross, and the choke and kill manifold is installed on the left side.
　　Installation position
　　When people face the gate of the derrick, the choke and kill manifold is installed on the right side of the wellhead cross, and the choke and kill manifold is installed on the left side.

　　use
　　Choke Manifold
　　1. Kill the well through the throttle valve to control the flow of fluid from the wellhead, control the wellhead back pressure (vertical pressure and casing pressure), keep the bottom hole pressure and formation pressure unchanged, and prevent overflow.
　　2. Through the throttle valve to reduce the wellhead pressure and realize "soft shut in".
　　3. The large amount of relief function of the blowout preventer leads the overflow out of the well site to prevent the well site from fire and poisoning and ensure the drilling safety.
　　Kill manifold
　　1. When the wellhead is completely sealed with a fully sealed ram, lift up and inject heavy mud into the wellbore for well killing.
　　2. In case of blowout, inject clean water into the shaft to prevent fire.
　　3. When the blowout is on fire, inject fire extinguishing agent into the shaft to help put out the fire.
　　Hydraulic control box
　　The panel of hydraulic control box is equipped with five tables and two valves, such as vertical pressure gauge, casing pressure gauge, valve position opening meter, oil pressure gauge, air pressure gauge, three position four-way reversing valve and speed regulating valve.
　　1. Vertical pressure gauge: it shows the vertical pressure of shut in.
　　2. Casing pressure gauge: display casing pressure during shut in.
　　3. Valve position opening meter: display the opening of hydraulic throttle valve.
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