低渗透油藏CO_2驱开发效果影响因素分析

Analysis of Influence Factors for Development Effect of CO_2 Flooding in Low Permeability Reservoirs

通过引入存气率、混相体积和混相效果等评判指标,采用实际动态和数值模拟相结合(动静结合)的手段,应用多元线性回归算法,建立了多因素筛选(序列)方法,完善了CO2驱混相程度评价方法,得到了影响开发效果的主控因素,为现场CO2驱方案的制定提供了一定的借鉴意义。结果表明,引入的存气率、混相体积和混相效果等参数,可以有效的评价混相开发效果;非均质程度对采出程度影响最为明显,其次是注入流体,影响较不明显的是原始地层压力;注入流体对混相效果影响最为明显,其次是原始地层压力,影响较不明显的是储层非均质程度。

Through the introduction of judging indexes of gas storage rate,miscible volume and miscible effect,using the method combined with the actual dynamic and numerical simulation,applying multiple linear regression algorithm,a multi-factor screening(sequence)method has been built,the evaluation method of CO2 miscible flooding is improved,and the main control factors affecting development effect are obtained which provides a reference for planning the development of CO2 flooding.The results show that the gas storage rate,miscible volume and miscible effect can effectively evaluate the development effect of miscible;degree of heterogeneity has most obviously influence on oil recovery degree;secondly is the injective fluid;lastly is the original formation pressure;the injective fluid has most obviously influence on miscible effect effects;secondly is the original formation pressure,lastly is the reservoir heterogeneity.