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Effect of pore pressure distribution on fracture behavior of sandstone in nitrogen fracturing

机译：孔隙压力分布对氮压裂中砂岩断裂行为的影响

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摘要

To investigate the effect of pore pressure distribution on fracture behavior of rock in gas fracturing, nitrogen fracturing experiments on the sandstone are performed under different gas filtration conditions. Results indicate that the breakdown pressure of the sandstone reduces with the decreasing amount of gas filtration. In no gas filtration case, the breakdown pressure value of the sample decreases by 69.98 and 45.6% in comparison to no gas invasion case and gas filtration case, respectively. The failure pattern of the sandstone sample is determined by borehole pressure and pore pressure, and it is mainly controlled by borehole pressure at high injection rate and controlled by pore pressure at low injection rate. In addition, pore pressure can promote microcracks initiation and high pore pressure distribution contributes to generating complex multifractures network. Furthermore, in order to popularize the experimental results to the field application, a method of special graded particles is proposed to temporarily plug induced and natural fractures during fracturing process and then prop these fractures after fracturing. The method is expected to improve fracturing efficiency and increase production of oil and gas in practical application.
机译：为研究孔隙压力分布对瓦斯压裂过程中岩石断裂行为的影响，在不同的气体过滤条件下对砂岩进行了氮气压裂实验。结果表明，随着气体过滤量的减少，砂岩的破裂压力降低。在没有气体过滤的情况下，与没有气体侵入的情况和气体过滤的情况相比，样品的击穿压力值分别降低了69.98和45.6％。砂岩样品的破坏模式取决于井眼压力和孔隙压力，主要由高注入速率下的井眼压力控制和低注入速率下的井眼压力控制。另外，孔隙压力可以促进微裂纹的产生，并且孔隙压力的高分布有助于产生复杂的多裂缝网络。此外，为了将实验结果推广到现场应用，提出了一种特殊梯度颗粒的方法，在压裂过程中暂时堵塞诱发裂缝和自然裂缝，然后在压裂后支撑这些裂缝。该方法有望在实际应用中提高压裂效率，增加油气产量。

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  • 来源
    《Energy Exploration & Exploitation》 |2017年第5期|609-626|共18页
  • 作者

    Hou Peng; Gao Feng; Gao Yanan; Yang Yugui; Cai Chengzheng;

  • 作者单位

    China Univ Min & Technol, State Key Lab Geomech & Deep Underground Engn, 1 Daxue Rd, Xuzhou 221116, Jiangsu, Peoples R China;

    China Univ Min & Technol, State Key Lab Geomech & Deep Underground Engn, 1 Daxue Rd, Xuzhou 221116, Jiangsu, Peoples R China|China Univ Min & Technol, Sch Mech & Civil Engn, Xuzhou, Jiangsu, Peoples R China;

    China Univ Min & Technol, State Key Lab Geomech & Deep Underground Engn, 1 Daxue Rd, Xuzhou 221116, Jiangsu, Peoples R China;

    China Univ Min & Technol, State Key Lab Geomech & Deep Underground Engn, 1 Daxue Rd, Xuzhou 221116, Jiangsu, Peoples R China;

    China Univ Min & Technol, State Key Lab Geomech & Deep Underground Engn, 1 Daxue Rd, Xuzhou 221116, Jiangsu, 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

    Sandstone; nitrogen fracturing; pore pressure distribution; gas infiltration; fracture behavior; graded particles;

    机译：砂岩;氮压裂;孔隙压力分布;气体渗透;断裂行为;颗粒分级;

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