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Impact of pulsation frequency and pressure amplitude on the evolution of coal pore structures during gas fracturing

机译：脉动频率和压力幅度对气体压裂过程中煤孔结构演变的影响

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摘要

Pulse gas fracturing (PGF) is a method of injecting high-pressure gas into coal cyclically to stimulate the coalbed methane reservoir. However, the evolution of coal pore structure during pulse gas fracturing is still unclear, especially when the injection pressure is lower than the breakdown pressure of coal. In this paper, 11 groups of PGF experiments with the injection pressure amplitude no more than 8 MPa were carried out on coal. Furthermore, the pore size distribution and the crack morphology of coal samples before and after PGF were observed. The experimental results show that pulse gas fracturing with relatively lower injection pressure increases the total pore volume and the permeability exponentially. Moreover, with the increase of pulsation frequency or of injection pressure amplitude, the volume of macropores and its proportion in total pore volume rise significantly, and the increasing rate gradually grows. However, the mesopore volume and its proportion in the total pore volume go up with the increase of pulsation frequency, but remain basically unchanged with the rise of injection pressure amplitude. Besides, the volume of micropores and transition pores slightly fluctuates. In addition, PGF hardly generate wide main fractures in the coal body, and instead mainly causes the tip of pores to propagate and induces substantial micro-cracks. The accumulation of irreversible deformation such as plastic deformation of pores and propagation of micro-cracks is the fundamental cause why the total pore volume and the permeability of coal grow continuously. The research results lay a foundation for understanding the fracturing effect of PGF.
机译：脉冲气体压裂（PGF）是循环地将高压气体注入煤中的方法，以刺激煤层储存器。然而，脉冲气体压裂期间的煤孔结构的演变仍然不清楚，特别是当注射压力低于煤的击穿压力时。本文在煤炭上进行11组具有注射压力幅度的PGF实验，不超过8MPa。此外，观察到PGF前后煤样的孔径分布和煤样的裂纹形态。实验结果表明，具有相对较低的注射压力的脉冲气体压裂增加了总孔体积和渗透性。此外，随着脉动频率或注射压力幅度的增加，大孔的体积及其在总孔体积中的比例显着上升，并且增加的速率逐渐增长。然而，中孔体积及其在总孔体积中的比例随着脉动频率的增加而上升，但随着注射压力幅度的上升，基本保持基本不变。此外，微孔和过渡孔的体积略微波动。此外，PGF几乎没有在煤体中产生宽的主要骨折，而是主要导致孔的尖端繁殖并诱导大量的微裂纹。不可逆变形的积累如孔隙的塑性变形和微裂纹的传播是为什么总孔体积和煤的渗透性连续增长。研究结果为理解PGF的压裂效果奠定了基础。

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  • 来源
    《Fuel》 |2020年第may15期|117324.1-117324.13|共13页
  • 作者

    Liu Yingke; Wen Xiaojiang; Jiang Mingjun; He Zhihong; Kang Jianhong; Gao Feng; Zhou Fubao; Wei Mingyao; Liu Xiangzhong;

  • 作者单位

    China Univ Min & Technol Key Lab Gas & Fire Control Coal Mines Minist Educ Xuzhou 221116 Jiangsu Peoples R China|China Univ Min & Technol Jiangsu Key Lab Fire Safety Urban Underground Spa Xuzhou 221116 Jiangsu Peoples R China|China Univ Min & Technol Fac Safety Engn Xuzhou 221116 Jiangsu Peoples R China;

    China Univ Min & Technol Key Lab Gas & Fire Control Coal Mines Minist Educ Xuzhou 221116 Jiangsu Peoples R China|China Univ Min & Technol Fac Safety Engn Xuzhou 221116 Jiangsu Peoples R China;

    China Univ Min & Technol Fac Safety Engn Xuzhou 221116 Jiangsu Peoples R China;

    Xishan Coal Elect Grp Co Ltd Taiyuan 030024 Shanxi Peoples R China;

    China Univ Min & Technol Key Lab Gas & Fire Control Coal Mines Minist Educ Xuzhou 221116 Jiangsu Peoples R China|China Univ Min & Technol Fac Safety Engn Xuzhou 221116 Jiangsu Peoples R China;

    China Univ Min & Technol State Key Lab Geomech & Deep Underground Engn Xuzhou 221116 Jiangsu Peoples R China;

    China Univ Min & Technol Key Lab Gas & Fire Control Coal Mines Minist Educ Xuzhou 221116 Jiangsu Peoples R China|China Univ Min & Technol Jiangsu Key Lab Fire Safety Urban Underground Spa Xuzhou 221116 Jiangsu Peoples R China|China Univ Min & Technol Fac Safety Engn Xuzhou 221116 Jiangsu Peoples R China;

    China Univ Min & Technol IoT Percept Mine Res Ctr Natl & Local Joint Engn Lab Internet Applicat Tec Xuzhou 221116 Jiangsu Peoples R China;

    Xishan Coal Elect Grp Co Ltd Taiyuan 030024 Shanxi Peoples R China;

  • 收录信息 美国《科学引文索引》(SCI);美国《工程索引》(EI);
  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类
  • 关键词

    Pulse gas fracturing; Pore size distribution; Pulsation frequency; Injection pressure amplitude; Coal;

    机译：脉冲气体压裂;孔径分布;脉动频率;注射压力幅度;煤;

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