摘要
微生物在油藏中的运移能力直接影响到微生物在整个油层中的生长,以及微生物自身及代谢产物与原油间的相互作用。将筛选的微生物注入到低渗透率的岩心中,从微生物驱油效率、注入压力和微生物通过岩心的菌液浓度变化等方面研究了微生物的运移能力,并对通过恒速压汞技术测出的岩心孔喉半径与微生物个体大小的匹配关系进行了分析。实验结果表明,应用微生物驱替渗透率低于18.8×10-3μm2的岩心,提高的采收率低于4.22%。其主要原因是微生物个体的大小与岩心的平均喉道半径不匹配,平均喉道半径越小,渗流阻力越大,导致微生物的运移能力下降。提出了用喉道半径与微生物个体大小的匹配关系取代渗透率,并将其作为低渗透油藏微生物采油筛选条件的一个标准。
The capacity of microbial migration in the oil reservoir directly affects the growth of microbes in the whole oil layers and the interaction of itself and its catabolites with the oil. The capacity of microbial migration was studied from the oil displacement efficiency by microbial,injected pressure,and the modification of bacterial concentration while screened microbes were injected into the cores with low permeability,the match relationship between the pore throat radius of the cores, which was measured by the constant - speed mercury intrusion technology and the magnitude of bacteria was analyzed. The test results indicate that the enhanced oil recovery was less than 4.22% when displacing the cores with the permeability less than 18. 8 × 10-3 μm2 by the microbial drive. The main reasons are that the pore throat radius did not match with the size of the bacteria,the less the average pore throat radius is,the greater the penetrating resistance, therefore, the capacity of the microbial migration declined. The match between throat radian and size of bacteria is taken as a criterion of screening condition of microbial enhanced oil recovery for low ?permeability oil reservoir instead of permeability.
出处
《油气地质与采收率》
CAS
CSCD
北大核心
2006年第2期85-87,共3页
Petroleum Geology and Recovery Efficiency
关键词
微生物
运移
喉道半径
低渗透
microbe, migration, throat radius, low permeability
