Carbon dioxide foam injecting device of oil well

The invention provides a carbon dioxide foam injecting device of an oil well and relates to a mechanical device in an oil mine field. The carbon dioxide foam injecting device is composed of a cylinder body, a carbon dioxide inlet, a dosing port and a mixed liquid outlet. One end of the cylinder body is provided with the carbon dioxide inlet, the other end of the cylinder body is provided with the mixed liquid outlet, a side wall at one end of the cylinder body close to the carbon dioxide inlet is provided with the dosing port. The carbon dioxide inlet in the cylinder body is connected with a spraying pipe, and a stirring paddle is arranged on a fixing frame from the spraying pipe to a mixed liquid outlet space. The carbon dioxide foam injecting device of the oil well is novel in structure, low in construction cost and high-pressure-resisting, the cylinder body is made of stainless steel, and the material is OCr18Ni9 and can bear pressure of 25 MPa. Efficient flame retardant crystallized magnesium oxide is filled in a heater, an electric heat tracing band can heat a system at the temperature of 0-150 DEG C, and a temperature sensor externally-connected temperature control cabinet performs automatic control to a working state of an electric heating pipe. The carbon dioxide foam injecting device solves the problem of frozen blocking in the carbon dioxide foam oil-displacement process and effectively ensures the foaming performance of a carbon dioxide foam system.