微生物与三元复合驱结合提高采收率研究

大庆油田稠油酸值低，影响三元复合驱的应用效果，为了进一步提高稠油采收率，提出微生物与三元复合驱结合的开发思路。进行了菌种作用后稠油性质的变化、作用后稠油对三元体系界面张力的影响、菌液注入拌气比例及微观模型驱油和物理模拟驱油实验等研究，结果表明，微生物作用后稠油性质得到改善，流动性变好，作用后稠油酸值较未作用稠油提高20倍以上，与三元体系界面张力进一步降低。室内物理模拟驱油实验表明，先注入0.05 PV菌液，再用三元体系驱替，比单独化学驱油采收率增加8.66%。应用微生物技术与三元复合驱结合的方法，可以进一步提高采收率，降低三元复合驱成本，为低酸值油藏提供一种?济有效的开采方法。

EOR study based on combination of microbe with ASP flooding

The application of alkane/surfactant/polymer (ASP) flooding is not satisfying, because of the low acid value of crude oil in the oilfield. To further enhance oil recovery, the method combining microbe with ASP flooding is presented. Study is conducted on the change of crude oil quality after microbes take effect, the effect of crude oil on the interfacial tension of the ASP system, the scale of microbe injection with air, the microcosmic flooding model and physical simulation flooding experiments. Results show that the quality and flowability are improved after microbes take effect. The acid value of crude oil is increased by 20 times higher than before, and the interfacial tension with the ASP system drops further. Indoor physical simulation oil displacement experiment shows that the oil recovery may be enhanced by 8.66% by injecting 0.05PV functional microbe firstly and then using ASP formulation (main flooding agent is made in Daqing) to displace oil, compared to the method of using ASP flooding only. So the approach of using functional microbe to displace oil combined with ASP flooding may further enhance oil recovery, reduce ASP flooding costs, offering an economic and effective method for exploitation of reservoirs with low acid value.