The foam agent injection skid is mainly composed of container room, agent tank, dosing metering pump, valve, instrument, manifold, etc. The equipment adopts an integrated and modular design, integrating various modules such as dosing, mixing, storage, and injection into a container room. Using PLC and touch screen to monitor and set parameters such as flow rate, pressure, liquid level, and temperature of reagents and nitrogen. The nitrogen injection process and the agent injection process converge at the static mixer to complete the gas-liquid mixing and a certain degree of foam. The mixed medium is injected into the wellhead through pipeline valves, etc.