Influences of clean fracturing fluid viscosity and horizontal in-situ stress difference on hydraulic fracture propagation and morphology in coal seam

IF 6.9 1区 工程技术 Q2 ENERGY & FUELS International Journal of Coal Science & Technology Pub Date : 2024-05-09 DOI:10.1007/s40789-024-00692-y
Gang Wang, Shuxin Wang, Yixin Liu, Qiming Huang, Shengpeng Li, Shuliang Xie, Jinye Zheng, Jiuyuan Fan
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Abstract

The viscosity of fracturing fluid and in-situ stress difference are the two important factors that affect the hydraulic fracturing pressure and propagation morphology. In this study, raw coal was used to prepare coal samples for experiments, and clean fracturing fluid samples were prepared using CTAB surfactant. A series of hydraulic fracturing tests were conducted with an in-house developed triaxial hydraulic fracturing simulator and the fracturing process was monitored with an acoustic emission instrument to analyze the influences of fracturing fluid viscosity and horizontal in-situ stress difference on coal fracture propagation. The results show that the number of branched fractures decreased, the fracture pattern became simpler, the fractures width increased obviously, and the distribution of AE event points was concentrated with the increase of the fracturing fluid viscosity or the horizontal in-situ stress difference. The acoustic emission energy decreases with the increase of fracturing fluid viscosity and increases with the increase of horizontal in situ stress difference. The low viscosity clean fracturing fluid has strong elasticity and is easy to be compressed into the tip of fractures, resulting in complex fractures. The high viscosity clean fracturing fluids are the opposite. Our experimental results provide a reference and scientific basis for the design and optimization of field hydraulic fracturing parameters.

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清洁压裂液粘度和水平原位应力差对煤层水力压裂传播和形态的影响
压裂液粘度和原位应力差是影响水力压裂压力和传播形态的两个重要因素。本研究使用原煤制备实验用煤样,并使用 CTAB 表面活性剂制备清洁的压裂液样品。利用自主研发的三轴水力压裂模拟器进行了一系列水力压裂试验,并利用声发射仪监测压裂过程,分析压裂液粘度和水平原位应力差对煤炭裂缝扩展的影响。结果表明,随着压裂液粘度或水平原位应力差的增加,分支裂缝数量减少,裂缝形态变得简单,裂缝宽度明显增加,声发射事件点分布集中。声发射能量随压裂液粘度的增加而降低,随水平原位应力差的增加而增加。低粘度清洁压裂液具有很强的弹性,容易被压入裂缝尖端,形成复杂裂缝。而高粘度清洁压裂液则相反。我们的实验结果为油田水力压裂参数的设计和优化提供了参考和科学依据。
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来源期刊
CiteScore
11.40
自引率
8.40%
发文量
678
审稿时长
12 weeks
期刊介绍: The International Journal of Coal Science & Technology is a peer-reviewed open access journal that focuses on key topics of coal scientific research and mining development. It serves as a forum for scientists to present research findings and discuss challenging issues in the field. The journal covers a range of topics including coal geology, geochemistry, geophysics, mineralogy, and petrology. It also covers coal mining theory, technology, and engineering, as well as coal processing, utilization, and conversion. Additionally, the journal explores coal mining environment and reclamation, along with related aspects. The International Journal of Coal Science & Technology is published with China Coal Society, who also cover the publication costs. This means that authors do not need to pay an article-processing charge.
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