Mechanism and Pilot Test to Enhance Oil Recovery By Microbial Local Enrichment
Visualized experiments is applied to study mechanisms of crude oil consuming microorganisms to enhance oil recovery. It is discovered that they have the tendency to migrate directionally towards and eventually become closely contact with crude oil. This “local enrichment phenomenon consequently results in a high concentration of microbes around crude oil and hence forms the foundation for enhancing oil recovery using crude oil consuming microorganisms. It is found that the concentration of the colony around the carbon source is the highest, which is 5～6 quantity degree higher than that of the other places. The further, the thinner. The distribution of metabolic product concentration conforms to that of the thallus concentration. The simulated microscopic experiments manifest that the coordinated action of high concentration microbes and their metabolites results in varieties of mechanisms to startup residual oil, such as peeling off oil membranes, peeling off oil beads, blocking big pores, emulsifying and starting up residual oil and improving the wettability of the mortise wall, etc. The new technology of microbe waterflooding and breathing combination was applied in the field experiments. The wellhead pressure and the metabolic gas content all increased obviously and continuously in the shut up period. After the wells started up, it was observed with many analyzing method that the crude oil fluidity improved obviously, and the live microbes, CO2 and organic acid content all increased. All the above conditions are benefit for enhancing oil recovery, and the effect of oil-booster and precipitation was obvious over a long period of time.
crude oil consuming microorganisms local enrichment enhance oil recovery viscous reservoir oil displacement mechanism pilot test
LI Yiqiang JING Guicheng
Enhanced Oil Recovery Centre, Petroleum University, Beijing, China, 100083
国际会议
成都
英文
453-468
2010-10-10（万方平台首次上网日期，不代表论文的发表时间）