Abstract: The HYSYS software was used to simulate the condensation characteristics of two different components of oil and gas under pressurized conditions.The effects of pressurized condensation treatment on oil recovery rate,tail gas concentration and water removal rate were analyzed.Studies have shown that in different temperature zones,the effect of supercharging on oil and gas condensation characteristics is not the same.Pressurization in the temperature range of 20~-40 ℃ can significantly improve the recovery rate and water removal rate of oil and gas,and reduce the tail gas concentration.In the temperature range of-40~-80℃,the effect of pressurization is gradually reduced.For the temperature range of-80~ -120 ℃,the effect of supercharging has been negligible,so proper pressurization can increase the oil and gas condensation recovery of the high temperature zone and reduces the condensation load in the middle and low temperature zones.Under the condition of meeting the national oil and gas emission standards,the refrigeration temperature zone of the refrigeration system is upgraded,and a pressurized oil and gas condensation recovery system is proposed.For the cyclic performance,the simulation calculated that the system COP was 1.253.At the same time,a cooling system for recovering residual cooling was designed for the waste of cold caused by the direct discharge of exhaust gas.The results shows that the system with residual cooling recovery:the refrigerant flow rate of the single-stage compression refrigeration system and the two-stage self-cascading refrigeration system is respectively reduced by 9.3%and 53.5%,reducing the amount of refrigerant,and compared with the no-cooling recovery.The COP of the entire refrigeration system is increased by 8.9%,and the operating efficiency of the system is optimized.