文献类型：期刊文献

英文题名：Rheological Properties of a New Microbial Exopolysaccharide Produced by Sphingomonas sp. HS and Its Potential in Enhanced Oil Recovery

作者：Miao, Si-Jia[1,2];Zhou, Jing[1,2];Qi, Gui-Na[1,2];Liu, Jin-Feng[1,2,3];Yang, Shi-Zhong[1,2,3,4];Gang, Hongze[1,2,3];Mu, Bo-Zhong[1,2,3,4]

机构：[1]East China Univ Sci & Technol, State Key Lab Bioreactor Engn, Shanghai 200237, Peoples R China;[2]East China Univ Sci & Technol, Sch Chem & Mol Engn, Shanghai 200237, Peoples R China;[3]Minist Educ, Engn Res Ctr Microbial Enhanced Oil Recovery, Shanghai 200237, Peoples R China;[4]Shanghai Collaborat Innovat Ctr Biomfg Technol, Shanghai 200237, Peoples R China

年份：2022

卷号：36

期号：4

起止页码：1792

外文期刊名：ENERGY & FUELS

收录：;EI(收录号：20220611602355);WOS:【SCI-EXPANDED(收录号:WOS:000797927200003)】；

基金：This research was supported by funding from National Key Research and Development Program of China (2017YFB0308900), National Natural Science Foundation of China (51574125), and the Fundamental Research Funds for the Central Universities of China (50321101917017).

语种：英文

外文关键词：Surface active agents - Biomolecules - Enhanced recovery - Oil well flooding - Sodium chloride - Systems (metallurgical) - Floods - Oil sands

摘要：The alkali-free surfactant-polymer flooding system with ultralow interfacial tensions is still a challenge to enhance oil recovery at present. In this study, a new thermally stable and salt tolerant biopolymer (HS-EPS) was obtained from thje broth of Sphingomonas sp. HS, a newly isolated strain (CGMCC No. 22954). Compared to HPAM, the elasticity of HS-EPS was dominant which is conducive to enhancing oil recovery. The HS-EPS showed good viscosity stability at salinities up to 360 g/L of NaCl, 60 g/L of Ca2+, and 60 g/L of Mg2+, temperatures up to 90 degrees C, and pH 4-10. Meanwhile, a new alkali-free surfactant-polymer binary system was developed using HS-EPS and a biobased surfactant newly synthesized in our laboratory. The interfacial tension between this binary flooding system and Daqing crude oil was below 10(-2) mN/m with 100 g/L of NaCl, 400 mg/L of Ca2+, or at a temperature of 80 degrees C. In addition, this binary system possesses a good oil sand adsorption resistance, dilution resistance, and aging stability. These results demonstrate that the new biopolymer HS-EPS secreted by Sphingomonas sp. HS is promising in oil recovery in the alkali-free flooding system.