Research on paraffin removal and prevention by Bacillus spp. in high-salinity reservoirs |
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Authors: | J Wang Y W Gao Z Jin C H Liu Y Zhuang |
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Affiliation: | 1. State Key Laboratory of Heavy Oil Processing, College of Chemical Engineering, China University of Petroleum, Beijing, P. R. China;2. Research Institute of Shaanxi Yanchang Petroleum (Group) Limited Company, Xi'an, P. R. China |
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Abstract: | Problems in paraffin deposition occur frequently in oil exploitation. Considering the problem that some paraffin removal and prevention strains cannot grow in high-salinity reservoirs, we domesticated four salt-tolerant laboratory bacterial strains. Crude oil emulsification effect, paraffin removal rate, and paraffin prevention rate of the strains were evaluated. KB and JH-A strains exhibited good paraffin removal and prevention effects, with paraffin removal rates of 51.82% and 81.56%; and 51.82% and 80.90%, respectively. Gas chromatography mass spectrometry analysis of paraffin components before and after biodegradation was performed on KB and JH-A strains. Results showed that relative contents of n-alkanes between C15–C23 and C27–C30 evidently decreased, indicating their good biodegradation. This technique provides a new method for practical application of paraffin removal and prevention in high-salinity reservoirs. |
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Keywords: | biodegradation crude oil emulsification GC-MS analysis high salinity reservoir paraffin removal and prevention |
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