Author(s)

Gangzheng Sun¹, Jing Hu^1*, Qiongyao Chen¹, Zihui Chen¹, Weidong Wang², Qin Qian², Feng Han³, Ling Li³, Yuesheng Li³

¹Research Institute of Petroleum Engineering and Technology, Shengli Oilfield Company, Sinopec, Dongying, China.
²Shengli Oilfield Company, Sinopec, Dongying, China.
³Hekou Oil Production Factory, Shengli Oilfield Company, Dongying, China.

Microbial enhanced oil recovery (MEOR) is the research focus in the field of energy development as an environmentally friendly and low cost technology. MEOR can bes divided into indigenous microbial oil recovery and exogenous microbial oil recovery. The ultimate goal of indigenous microbial flooding is to enhance oil recovery via stimulation of specific indigenous microorganisms by injecting optimal nutrients. For studying the specific rule to activate the indigenous community during the long-term injection period, a series of indigenous displacement flooding experiments were carried out by using the long-core physical simulation test. The experimental results have shown that the movement of nutrients components (i.e., carbon/nitrogen/phosphorus) differed from the consumption of them. Moreover, there was a positive relationship between the nutrients concentration and bacteria concentration once observed in the produced fluid. And the trend of concentration of acetic acid was consistent with that of methanogens. When adding same activators, the impacts of selective activators to stimulate the indigenous microorganisms became worse along with the injection period, which led to less oil recovery efficiency.

Microbial Enhanced Oil Recovery (MEOR), Nutrient Concentration, Bacterial Concentration, Methanogens, Microbial Activity

Sun, G. , Hu, J. , Chen, Q. , Chen, Z. , Wang, W. , Qian, Q. , Han, F. , Li, L. and Li, Y. (2022) Relationship between Microbial Community Characteristics and Flooding Efficiency in Microbial Enhanced Oil Recovery. Advances in Bioscience and Biotechnology, 13, 242-253. doi: 10.4236/abb.2022.135014.