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

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