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| 共聚物增黏剂在超临界CO2中的微观结构与性能 |
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孙文超1,2,孙宝江1,汪海阁2,孙文霞3,卓鲁斌2,曾义金4,相华5
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(1.中国石油大学(华东)石油工程学院,山东青岛266580;2.中国石油集团工程技术研究院有限公司,北京 102206;3.中国石化胜利石油工程公司地质录井公司,山东东营 257100;4.中国石油化工股份有限公司石油工程技术研究院, 北京100101;5.俄罗斯国立古勃金石油天然气大学,莫斯科 119991)
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| 摘要: |
| 以同分异构体甲基丙烯酸甲酯(MMA)、丙烯酸乙酯(EAL)分别与1H,1H,2H,2H-全氟癸基丙烯酸酯(HFDA)共聚制备5种增黏剂,实验评价其溶解性能和增黏性能,并通过分子模拟分析CO2-共聚物体系的微观结构和分子间相互作用,探讨结构和组成对共聚物性能的影响。结果表明:P(HFDA-co-EAL)可以使超临界CO2(SC-CO2)的黏度提高34～87倍,随着EAL含量的增大,其分子间缔合程度增强,增黏性能随之提高,但溶解性能随之降低;P(HFDA-co-MMA)最高仅可以使SC-CO2的黏度提高51倍,溶解性能也较差;P(HFDA-co-MMA)主链上甲基的存在,降低了其分子链柔顺性和分子间缔合程度,使其溶解性能和增黏性能变差。 |
| 关键词: 无水压裂 页岩气 超临界CO2 增黏剂 分子模拟 |
| DOI：10.3969/j.issn.1673-5005.2019.06.008 |
| 分类号::TE 357 |
| 文献标识码:A |
| 基金项目:教育部长江学者和创新团队发展计划滚动支持项目(IRT_14R58);中国石油天然气集团公司工程技术重大专项(2018E-2102) |
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| Study on microstructure and activity of copolymer thickeners in supercritical CO2 |
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SUN Wenchao1,2, SUN Baojiang1, WANG Haige2, SUN Wenxia3, ZHUO Lubin2, ZENG Yijin4, XIANG Hua5
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(1.School of Petroleum Engineering in China University of Petroleum(East China), Qingdao 266580, China;2.Engineering Technology Research Institute Limited Company of China National Petroleum Corporation, Beijing 102206, China;3.Geological Logging Company, SINOPEC Shengli Petroleum Engineering Company Limited, Dongying 257100, China;4.SINOPEC Research Institute of Petroleum Engineering, Beijing 100101, China;5.Gubkin Russian State University of Oil and Gas, Moscow 119991, Russia)
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| Abstract: |
| Five kinds of thickening agents were synthesized by copolymerizing two isomers, methyl methacrylate (MMA) and ethyl acrylate(EAL),with 1H, 1H, 2H, 2H-perfluorodecyl acrylate (HFDA). The solubility and thickening capacity of the copolymers were evaluated by experiments. And the microstructure and intermolecular interaction of CO2-copolymer systems were analyzed by molecular simulation, through which the effects of structure and composition on the performances of the copolymers were discussed. The results show that P (HFDA-co-EAL)could enhance the viscosity of SC-CO2 by 34-87 times. With the enhancement of EAL content, the degree of intermolecular association increases, leading to the stronger thickening capability but the poor solubility. P (HFDA-co-MMA) could enhance the viscosity of SC-CO2 by 51 times, and the solubility is also weaker than P (HFDA-co-EAL). The presence of methyl group in the backbone of the latter reduces its molecular chain flexibility and inter molecular association degree, resulting in the poor solubility and thickening capability. |
| Key words: waterless fracturing shale gas supercritical CO2 thickening agents molecular simulation |
