J油田水气交替驱开发效果评价

Development result evaluation of gas-water alternatively displacing oil in J Oilfield

利用油藏数值模拟技术,采用单因素分析方法研究了井网形式、注采井距、注气时机、注气速度、水气交替注入周期、气水比对J油田水气交替驱开发效果的影响,并比较了水驱、气驱及水气交替驱的开发效果;基于QIM-AG算法,对比了水驱、气驱和水气交替驱的经济开发效益。结果表明:注气速度、气水比、注水时机对采出程度影响较大,而井距、注入周期对采出程度影响相对较小;较高的注气速度(0.08HCPV/a)、压力保持程度为1、小井距、气水体积比为1.5∶1、注入周期为3个月时可获得较高的采出程度;在注入气水总体积相同的条件下,气水交替驱比单纯水驱或气驱可获得更高的最终采收率,且具有更大的开发净现值。

The effects of well pattern,injection-production well spacing,gas injection occasion,gas injection rate,water-gas alternation cycle and gas-to-water volume ratio on the development result of J Oilfield are studied using single factor analysis method and reservoir numerical simulation technology. The development results and the economic benefits of water flooding,gas flooding and water-gas alternately flooding are compared,and it is shown that: gas injection rate,gas-to-water volume ratio and gas injection occasion have great influence on recovery factor,while injection-production well spacing and water-gas alternation cycle have less influence; high recovery factor can be achieved under the conditions of high gas injection rate( 0. 08 HCPV / a),pressure maintaining degree of 1,small injection-production well spacing,gas-to-water volume ratio of 1. 5: 1 and injection cycle of 3 months; water-gas alternately flooding has higher recovery factor and NPV than water flooding of gas flooding.