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通过建立机理模型,研究了M1油藏CO2驱气水交替注入的主要技术参数,并在此基础上,结合各井组地质模型,利用正交实验设计确定了各井组最优的气水交替注入方案。研究表明,气水交替注入时除了地层压力保持水平、注入气体浓度、CO2注入量、CO2注入速度、注水速度、CO2段塞数、气水段塞比等因素外,焖井时间及前后段塞比都会对开发效果产生影响。同水驱效果相比,在开采后期气水交替注入的采油量有了明显的提高,而含水率去比水驱要低,因此CO2驱气水交替可以在M1油藏使用。
Through the establishment of the mechanism model, the main technical parameters of alternate injection of CO2 flooding water in M1 reservoir were studied. On the basis of this, combined with the geological model of each well group, the optimum gas-water alternation Injection scheme. The results show that in addition to the formation pressure maintenance, gas injection rate, CO2 injection rate, CO2 injection rate, water injection speed, the number of CO2 slugs and gas-water slug ratio, Than the development of the impact will have an impact. Compared with the effect of waterflooding, the amount of oil and gas alternately injected into the later period of production has been significantly increased, while the water content is lower than that of the waterflood. Therefore, the replacement of CO2 flooding can be used in the M1 reservoir.