岩心渗透率对微生物驱油效果及生长分布的影响

Oil Displacement Effect and Growth Distribution of Microbial in Cores with Different Permeability

郭省学 刘 涛 郭辽原 巴 燕 曹嫣镔

GUO Shengxue， LIU Tao， GUO Liaoyuan， BA Yan， CAO Yanbin

为揭示岩心渗透率对微生物驱油效果的影响规律， 通过物理模拟的方法研究了不同渗透率条件下微生物在岩心中的生长代谢及驱油效果， 并采用扫描电镜分析了岩心内部菌体的分布。研究表明， 微生物激活生长以后能够产生驱油作用， 渗透率为500×10-3μm2时微生物驱提高采收率最大 （达6.6%）， 渗透率过高 （>1500×10-3μm2） 或过低 （<100×10-3 μm2） 时微生物驱油效果均变差。渗透率过低时， 孔吼半径较小， 微生物无法通过孔吼进入岩心内部； 渗透率过高时， 菌体随产出液驱出， 不能在岩心内部产生滞留作用。渗透率在100×10-3～ 1500×10-3 μm2范围内有利于微生物生长吸附和滞留作用， 此渗透率范围可以作为微生物驱油油藏渗透率筛选的依据。图 9表 2参13

In order to discover the influence rule of the reservoir permeability on the microbial flooding effect， the microbial growth and distribution and flooding effect in different core permeability was studied through physical simulation， and the distribution of bacteria in the cores was analyzed by scanning electron microscope. Research results showed that the maximum microbial enhanced oil recovery was 6.6% when the core permeability was of 500×10-3μm2. When the core permeability was too low（<100×10-3 μm2），the orifice radius was smaller， the cells could not be input；at the same time， when the core permeability was too high（>1500×10-3μm2）， the cells were output with liquid and could not realize the retention effect， in both cases the effect of microbial flooding was poor. Adsorption and retention of microbial was confirmed in the cores by the scanning electron microscope， the microorganism was advantageous to adsorption and retention when the permeability was in range of 100×10-3—1500×10-3 μm2. The permeability rangecould be used as a basis for screening the permeability of microbial flooding reservoirs.

10.19346/j.cnki.1000-4092.2018.01.024