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由于具有较低的粘度和注入能力,CO2驱在低渗油田开发中相比衰竭和注水开发有明显的优势,而其开发效果受地质条件、油藏能量、流体特征及工艺技术等多种因素影响.常规的油藏数值模拟方法只能进行单次单因素分析,且不能分析不同因素之间的交互作用,难以满足上述低渗油藏CO2驱中的多因素多水平的研究需要.作者将实验设计方法引入上述CO2驱优化设计的数值模拟研究中,利用该方法可以利用少量具有代表性的CO2方案,最大量地获取需要的敏感性分析信息,从而有效提高数值模拟方法的效率.采用上述方法分析了低渗油藏CO2驱中的关键因素以及它们之间的交互作用,确定了适合低渗油藏条件的CO2驱注采方式、注采井型及其优化组合.研究表明,利用大斜度井连续注CO2,结合生产井生产气油比和油藏平均压力实施开关井控制方法可以增加注入能力、缩短开发周期,并能够同时获得油藏采收率和温室气体埋存的联合优化效果;研究同时发现存在相渗滞后作用的情况下油藏CO2埋存潜力较大.
Due to its lower viscosity and injection capacity, CO2 flooding has a clear advantage over depletion and waterflooding development in the development of low permeability oilfields, and its development is affected by many factors, such as geological conditions, reservoir energy, fluid characteristics and process technology The conventional reservoir numerical simulation method can only carry out a single univariate analysis, and can not analyze the interaction between different factors, it is difficult to meet the multi-factor and multi-level research needs of CO2 flooding in low permeability reservoirs. The experimental design method is introduced into the above numerical simulation study of CO2 flooding optimization design. By using this method, a small amount of representative CO2 schemes can be used to obtain the maximum amount of sensitivity analysis information required, so as to effectively improve the efficiency of the numerical simulation method. Methods The key factors of CO2 flooding in low permeability reservoirs and the interaction between them were analyzed, and the CO2 flooding and injection method, injection well pattern and optimization combination suitable for low permeability reservoirs were determined. The results show that the use of large Inclined well continuous injection of CO2, combined with production wells gas-oil ratio and reservoir average pressure of the implementation of the switch well control method can increase the injection capacity and shorten the development week And the ability to simultaneously obtain oil recovery and sequestration of greenhouse gases joint optimization results; The study also found that the presence of reservoir CO2 storage under conditions of relative permeability hysteresis potential.