摘要
针对液态纯CO_(2)的低黏度及低黏度下压裂效果差的现状,基于开环聚合反应和硅氢加成反应制备可显著增稠液态CO_(2)的硅氧烷聚合物。测量不同温度和压力下含增稠剂的CO_(2)压裂液的黏度;分析硅氧烷做增稠剂的增稠机理;并基于扩展有限元(XFEM)对含增稠剂的CO_(2)压裂液进行压裂模拟。结果表明,当增稠剂浓度为5 wt%时,含增稠剂的CO_(2)压裂液黏度可达1.65 mPa·s(20℃)。压裂液黏度随温度的升高而降低,随压力和增稠剂含量升高而升高。基于XFEM的液态CO_(2)增稠效果压裂模拟分析显示,增稠后的CO_(2)压裂液可使裂缝半缝长增至38 m,相较于纯CO_(2)压裂液具有更好的压裂效果。增稠测试和压裂效果模拟为CO_(2)干法压裂用增稠剂的设计提供参考。
To address the problem of the low viscosity of pure liquid CO_(2)and poor fracturing effect at low viscosity,a siloxane polymer that significantly thickens CO_(2)was prepared based on the ring opening polymerization and hydrosilylation. The viscosity of the CO_(2)fracturing fluid that contains this thickener was measured at different pressure and temperature. The thickening process of siloxane as a thickening agent was analyzed;and fracturing simulation of the CO_(2)fracturing fluid containing thickener was performed based on extended finite element(XFEM). The results show that the viscosity of the CO_(2)fracturing fluid containing thickener can reach up to 1.65 mPa·s(20℃)when the concentration of the thickening agent is 5 wt%. The viscosity of the fracturing fluid decreases with the increase of temperature and increases with the increase of pressure and thickener content. The fracturing simulation analysis of the thickening effect of liquid CO_(2)based on XFEM shows that the thickened CO_(2)fracturing fluid can increase the fracture half-length to 38 m,which provides better fracturing effect compared with the pure CO_(2)fracturing fluid. The thickening test and fracturing effect simulation provide a benchmark for the design of thickeners used for CO_(2)dry fracturing.
作者
李强
王福玲
周畅
陈佳硕
李庆超
王彦玲
LI Qiang;WANG Fuling;ZHOU Chang;Chen Jiashuo;LI Qingchao;Wang Yanling(College of Science,Heilongjiang Bayi Agricultural University,Daqing 163000,Heilongjiang,China;Key Laboratory of Unconventional Oil and Gas Development of Ministry of Education,College of Petroleum Engineering,China University of Petroleum(East China),Qingdao 266580,Shandong,China;School of Energy Science and Engineering,Henan Polytechnic University,Jiaozuo 454003,Henan,China)
出处
《新疆石油天然气》
CAS
2023年第1期73-80,共8页
Xinjiang Oil & Gas
基金
黑龙江八一农垦大学青年创新人才项目“超临界CO_(2)压裂用增稠剂的制备及性能研究”(ZRCQC202106)
黑龙江八一农垦大学高层次人才引进计划培育项目“非常规页岩油气储层超临界CO_(2)压裂用增稠剂的分子设计及增稠机理研究”(XYB202115)。
