孤岛油田中一区馆3区块聚合物驱后微生物驱油先导试验

Microbial flooding after polymer flooding pilot test in Ng3 of Zhong1 area, Gudao oilfield

为了探索微生物驱油技术在聚合物驱后油藏的适应性和驱油效果,在孤岛油田中一区馆3区块开展了先导试验.在室内筛选了激活剂配方,有效激活了试验区块的内源微生物群落;同时筛选了4株在油藏环境下能大量生长繁殖的外源高效驱油菌种,对试验区原油具有良好的乳化作用.室内物理模拟驱油实验结果表明,聚合物驱后微生物驱可提高驱油效率7.8％ ～ 8.3％.在室内实验基础上开展了现场试验,油井产出液跟踪检测结果表明,油藏微生物得到了有效激活,且具有良好的代谢活性,代谢产物乙酸根质量浓度最高可达105 mg/L;生产动态分析表明,试验后油藏的生产动态得到了显著改善,提高采收率为1.27％,试验期间试验区采出程度提高了4.7％,达57.8％.

In order to study the adaptation and effect of microbial flooding after polymer flooding pilot, the test was conducted as pilot project in Ng3 of Zhong1 area. The indigenous microorganisms are first activated and then filtrated; at the same time, 4 strains of functional bacteria are obtained, the bacteria are mass propagated at the reservoir environment, and the crude oil can be emulsified by the microbe. Meanwhile, the physical simulation experiment is studied under the pressure and temperature of the reservoir, and, the result indicates that the oil recovery is enhanced by 7.8%-8.3% by the bacteria. The field test indicates that the microbe is activated and the concentration of metabolism of acetate may reach 105 mg/L. The production dynamic is improved, and the oil recovery is enhanced by 1.27%, and the recovery factor in the pilot is increased by 4.7% to 57.8%.