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压裂—解析一体化压裂液体系的 构建及性能评价

Construction and Performance Evaluation of Integrated Coalbed Methane Fracturing Fluid System

Environment and Resource / 2025,7(1): 21-39 / 2025-07-11 25 19

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• Authors: 王婷 李小凤 魏 磊 龙楚芝 尹棠 官宇 许娜 邢博冉 唐剑 李小江
• Information:

  重庆科技大学化学化工学院， 重庆

• Keywords:
  Coalbed methane fracturing fluid; Integrated system; Performance evaluation; Compatibility; Desorption promotion; Drag reduction rate
  煤层气压裂液; 一体化体系; 性能评价; 配伍性; 促解吸; 减阻率
• Abstract: Aiming at the problem that deep coalbed methane mainly exists in the form of adsorbed gas and is difficult to desorb, this study compounded the desorption-promoting system with special emulsion fracturing fluid for coalbed methane to construct three integrated coalbed methane fracturing fluid systems: SDBS system, (SDBS+OB-2) system and FNC system. The coal compatibility and comprehensive properties of the systems were evaluated through experiments such as infrared spectroscopy analysis, Zeta potential measurement, thickening performance, sand-carrying performance, gel-breaking performance, residue measurement and drag reduction performance. The results show that the integrated system can significantly improve the hydrophilicity and wettability of coal, with the absolute value of Zeta potential greater than 60 mV, indicating excellent compatibility with coal seams. It shows good thickening characteristics in clear water base fluid, with a viscosity of 102-120 mPa·s at an emulsion concentration of 1.5wt%, and excellent sand-carrying performance. After 51 hours of static sedimentation, the ceramsite in the (SDBS+OB-2) system is not completely settled. It is completely gel-breaking at 80°C within 420 minutes, the residue content is less than 1 mg/L, and the surface tension of the gel-breaking fluid is lower than 28 mN/m. When the flow rate is greater than 25 L/min, the drag reduction rates of the (SDBS+OB-2) system and FNC system exceed 65%, meeting the on-site construction requirements. The integrated fracturing fluid system realizes the synergistic effect of fracturing-desorption, providing technical support for the development of deep coalbed methane. 针对深层煤层气以吸附气为主、解吸难度大的问题，本研究将促解吸体系与煤层气专用乳液压裂液复配，构建了SDBS体系、（SDBS+OB-2）体系及FNC体系三种一体化煤层气压裂液体系。通过红外光谱分析、Zeta电位测定、增黏性能、携砂性能、破胶性能、残渣测量及减阻性能等实验，对体系的煤层配伍性及综合性能进行评价。结果表明：一体化体系可显著提高煤的亲水性与润湿性，Zeta电位绝对值大于60mV，与煤层配伍性优良；在清水基液中表现出良好的增黏特性，乳液浓度1.5wt%时黏度达102～120mPa·s，携砂性能优异，静态沉降51h后（SDBS+OB-2）体系陶粒未完全沉降；80℃下420min完全破胶，残渣含量均小于1mg/L，破胶液表面张力低于28mN/m；当流量大于25L/min时，（SDBS+OB-2）体系和FNC体系减阻率超65%，满足现场施工要求。该一体化压裂液体系实现了压裂—解析协同作用，为深层煤层气开发提供了技术支撑。
• DOI: https://doi.org/10.35534/er.0701003
• Cite: 王婷，李小凤，魏磊，等．压裂—解析一体化压裂液体系的构建及性能评价［J］．环境与资源，2025，7（1）：21-39．