关键词: 封闭油藏, CO₂, 烟道气, 增能降粘, 压力衰竭

Abstract: Bounded reservoir produced oil mainly by self-expanding energy, and pressure decreases rapidly. It can increase bounded reservoir pressure and formation expansion ability by injecting CO₂ or flue gas. Injected flue gas, CO2 and heavy oil into a HTHP PVT equipment, and measured it's viscosity and volume factors in the condition 1 MPa to 7 MPa. Simulating heavy oil, after injected flue gas or CO₂ , pressure depleted recovery process by using core huff and puff experiment. Experimental results show the CO₂ and flue gas dissolved in oil can greatly decrease oil viscosity. Oil viscosity, saturated CO₂ , decreased more than 95%, and volume expansion increased 15% in 40 ℃, 7 MPa condition；but in the same condition oil viscosity, saturated flue gas, decreased 38.1%，and volume expansion increased 4.9%. Pressure depletion experiments show the injecting 0.4 PV gas is optimum. It can displace out 57.84% oil by injecting three runs o.4 PV CO₂; and get 43.99% by injecting three runs 0.4 PV flue gas. Oil recovery increases separately 17.31%, 13.29% by injecting 0.4 PV CO₂ or flue gas after water flooding.

Key words: 封闭油藏 , CO₂ , 烟道气 , 增能降粘 , 压力衰竭