逆变凝结油气田增产研究

Study on the Simulatuon of Retrograde Condensate Oil and Gas Field

以某矿场所产低热值矿品气（含43％CO2）为注入气，对A气田进行成份模拟研究，比较其六种不同注气循环方案之结果与经济效益。研究结果显示，其最佳方案为利用现有之2口生产井为注气井，余6口井为生产井，一面注入矿品气一面生产，注气生产为期7a，停止注气后再降压生产9a，估计可将采收率提高为天然气76％，凝结油60％，及增加回收液化石油气，天然汽油十余万方，另根据经济分析，投资额3．4亿元新台币，投资报酬率为32％，净现值为15.5亿元新台币（在10％折现率下），颇具经济效益。

Compositional simulation of A Gas Field is studied by using a kind of low heating value flue gas containing 43% CO2 as injected gas. The results and economic effect of six different gas injection programmes are compared. The best programme is to use 2 existing production wells as gas injection wells,the 6 surplus wells as production wells. The production is carried as the flue gas is injected. The time of production by gas injection is 7 years. After gas injection be stopped,the time of production by depressurization is 9 years. The estimative gas recovery can be increased to 76 %,and condensate to 60%. The increment of liquified petroleum and natural gas is more than 10×10 5m3. On the basis of economic analyses,the investment number is 3. 4×10 8 Yuan；the ratio of investment income is 32 %;the net present value is 1. 55×10 9 Yuan on condition that the discount rate is 10%.