CO2 injection pump system

The invention relates to a pump system, in particular to a CO2 injection pump system, which can be applied to coal bed gas and oil exploitation. The CO2 injection pump system is provided to solve thetechnical problems that through an existing CO2 injection pump system, CO2 is quickly vaporized in the pre-cooling process, a reciprocating injection pump has a poor driving effect on vaporized CO2, the vaporized CO2 needs to be discharged multiple times, and consequently consumed time is long and a pump medium is consumed in the whole pre-cooling process. The system comprises a control cabinet, an injection pipeline, an inlet stop valve, a centrifugal pump with an inducer, an inlet pressure gage, an inlet safety valve, a reciprocating injection pump, an outlet safety valve, an outlet energy accumulator and an outlet pressure gage, wherein the inlet stop valve, the centrifugal pump with the inducer, the inlet pressure gage, the inlet safety valve, the reciprocating injection pump, the outlet safety valve, the outl