Effect of Siloxane-Based Thickener on Properties of Carbon Dioxide Fracturing Fluid

doi:10.12388/j.issn.1673-2677.2023.01.011

Abstract

Abstract:

To address the problem of the low viscosity of pure liquid CO₂ and poor fracturing effect at low viscosity，a siloxane polymer that significantly thickens CO₂ was prepared based on the ring opening polymerization and hydrosilylation. The viscosity of the CO₂ 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 CO₂ fracturing fluid containing thickener was performed based on extended finite element （XFEM）. The results show that the viscosity of the CO₂ 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 CO₂ based on XFEM shows that the thickened CO₂ fracturing fluid can increase the fracture half-length to 38 m，which provides better fracturing effect compared with the pure CO₂ fracturing fluid. The thickening test and fracturing effect simulation provide a benchmark for the design of thickeners used for CO₂ dry fracturing.

Key words:

CO₂ , fracturing, oil and gas field development, enhanced oil recovery, greenhouse effect, CO₂ , thickener

摘要：

针对液态纯CO₂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CO₂的硅氧烷聚合物。测量不同温度和压力下含增稠剂的CO₂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CO₂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CO₂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CO₂增稠效果压裂模拟分析显示，增稠后的CO₂压裂液可使裂缝半缝长增至38 m，相较于纯CO₂压裂液具有更好的压裂效果。增稠测试和压裂效果模拟为CO₂干法压裂用增稠剂的设计提供参考。

关键词:

"> CO₂压裂, 油气田开发, 提高采收率, 温室效应, CO₂增稠剂

LI Qiang, , WANG Fuling, , ZHOU Chang , Chen Jiashuo , LI Qingchao, , Wang Yanling. Effect of Siloxane-Based Thickener on Properties of Carbon Dioxide Fracturing Fluid[J]. Xinjiang Oil & Gas, 2023, 19(1): 73-80.

李强, , 王福玲, , 周畅 , 陈佳硕 , 李庆超, , 王彦玲. 硅氧烷类增稠剂对二氧化碳压裂液的性能影响[J]. 新疆石油天然气, 2023, 19(1): 73-80.

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