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Micromechanism of microbial enhanced oil recovery
LEI Guang-lun1,MA Ji-ye1,WANG Wei-dong2,GUO Sheng-xue2,GUO Liao-yuan2,SONG Shuo1
(1. College of Petroleum Engineering in China University of Petroleum, Dongying 257061 ’China;2. Oil Production Technology Research Institute, Shengli Oilfield, SINOPEC, Dongying 257000)
Abstract:
Under simulated reservoir conditions, the forms and flow phenomena of remaining oil during water flooding and microbial flooding were observed and analyzed by using microvisual simulation plane models and microvisual models with blind holes. The micromechanism of microbial flooding and remaining oil displacement in blind holes was researched. By rheological experiment of dynamic dilatational viscoelasticity,the effects of bacterias and surfactants on oil-water interfacial film and oil flow ability were also quantitatively studied. The results show that the microbe changes the forms and distribution of remaining oil by degradation oil and its catabolites including biogas and biosurfactants. Microbial flooding has several oil displacement styles including gas drive, sliding rapidly on the gas-liquid interface and peeling oil film. The biogas associated by biosurfactants can enter blind holes where water flooding,polymer flooding and gas drive could not sweep, and replace remaining oil. Microbe itself has interfacial activity. The tension of oil-ivater interface film could be decreased by microbe and its catabolites, and the oil flow ability is improved.
Key words:  microbe  oil displacement experiment  micromechanism  dilatational rheology property