This paper introduces the working principle, operation conditions and
process of the oil and gas storage and condensation recovery system as the third oil and
gas recovery technology. The system can condense part of the oil and gas in the tank of
the gas station into liquid oil, send the partially liquefied oil and gas to the membrane
separation device, separate the carbon and hydrogen compounds in the mixture, and
send the separated liquid oil and high concentration oil and gas back to the tank for
utilization Controlling the pressure of the storage tank and ensuring the safe operation
of the system can truly realize the recovery and utilization of oil and gas.