利用微生物调剖技术提高原油采收率

利用微生物及其代谢产物进行油藏注水剖面的调整,克服了常规机械调剖及化学调剖存在的不足,达到提高原油采收率的目的.该研究分离出五组适应温度在30～60℃,具有耐矿化度、能与地层原生菌相容生长、对20μm²以下的岩心堵塞率大于90%的微生物菌群.该菌群包括球菌、杆菌及丝状菌.对菌种特性及微生物调剖剂在岩心封堵中的特性进行了描述.经5口井8个月的矿场试验,初步统计增油1432t,且受益井继续有效.室内模拟调剖试验及矿井现场试验证明分离筛选出的微生物具有良好的降低岩心渗透率,提高原油采收率的作用,且工艺简单、施工安全、不污染环境,同时降低了材料和施工的成本.

ENHANCING OIL RECOVERY BY MICROBIAL PROFILE CONTROL

The paper discussed a method of enhancing oil recovery by water injection profile control with microbe and its metabolize products in oil reservoirs.It has advantages over the routine (mechanical and chemical) profile control methods in many aspects.A group of microbe with saltresisting and temperature-adapting of 30~60℃were separated,which can live compatibly with the original microbe in reservoir and can plug the core whose permeability is less than 20μm² with the plugging ratio more than 90%.It includes coccus,bacilli and mycelia.The paper also described the microbe characteristics and the mechanism of microbial profile control.It is proved that the microbe separated can effectively reduce the core permeability in lab simulation profile control test and improve the oil recovery in field test.