Abstract: A good economic benefit in the industrialized application of polymer flooding has been achieved in Daqing Oilfield. The oil recovery of polymer flooding increased by 10 percent of original oil in-place (OOIP) more than that of water flooding. The polymer flooding has become the most important step to maintain the continuous development of oilfield. However, there is still about 50 percent of remaining oil in the oil-bearing formation after polymer flooding. It is important to deal with the remaining oil while developing Daqing Oilfield. According to the special physical and chemical environment of the reservoir after polymer flooding in Daqing Nfield, the microorganisms that can grow with partially hydrolyzed polyacrylamide (PHPA) and take crude oil as the nutritional source were selected. At the same time, the characteristics of the microorganisms were evaluated. Physical simulation flooding experiments showed that oil recovery could increase by 5 percent of OOIP using microbial flooding and by 16 percent of OOIP with combined microbial-chemical flooding after polymer flooding.

Key words: polymer flooding, microbial flooding, partially hydrolyzed polyacrylamide, physical simulation flooding test, microorganisms, characteristics evaluation, enhancing oil recovery

摘要： 在大庆油田,聚合物驱工业化推广应用取得了显著的经济效果,比水驱提高采收率10%以上,目前产油量已突破10⁷t/a,成为油田可持续发展的重大技术措施。尽管如此,聚合物驱后油层中仍剩有50%的原油未被采出。针对大庆油田聚合物驱后油层的物化环境,筛选出了以聚合物和原油为营养源增油的菌种。并对其性能进行了系统的评价。物理模拟驱油实验结果表明,聚合物驱后单独微生物驱可提高采收率5%,微生物驱与化学驱结合可提高采收率16%。

关键词: 聚合物驱, 微生物驱, 部分水解聚丙烯酰胺, 物理模拟驱油实验, 菌种, 性能评价, 提高采收率