长江科学院院报 ›› 2016, Vol. 33 ›› Issue (7): 63-67.DOI: 10.11988/ckyyb.20150234

• 岩土工程 • 上一篇    下一篇

基于FDEM-flow的多孔水力压裂模拟

严成增1a,1b, 郑宏2a,2b   

  1. 1.北京工业大学 a.城市与工程安全减灾省部共建教育部重点实验室; b.建筑工程学院, 北京 100124;
    2.中国科学院 a.武汉岩土力学研究所; b.岩土力学与工程国家重点实验室,武汉 430071
  • 收稿日期:2005-03-31 出版日期:2016-07-01 发布日期:2016-07-11
  • 作者简介:严成增(1986-),男,湖南衡阳人, 助理研究员,博士后,主要从事离散元有限元耦合、离散元、多物理场耦合、水力压裂、高性能并行计算以及软件工程方面的研究,(电话)010-67391645(电子信箱)yanchengzheng86@gmail.com。
  • 基金资助:
    中国博士后科学基金面上项目(2015M580953);国家重点基础研究发展计划(973)项目(2011CB013505, 2014CB047100)

Simulation of Multi-hole Hydraulic Fracturing Using FDEM-flow Method

YAN Cheng-zeng1,2, ZHENG Hong3,4   

  1. 1.Key Laboratory of Urban Security and Disaster Engineering of Ministry of Education, Beijing University of Technology, Beijing 100124, China;
    2.College of Architecture and Civil Engineering, Beijing University of Technology, Beijing 100124, China;
    3.Institute of Rock and Soil Mechanics, Chinese Academy of Sciences, Wuhan 430071, China;
    4.State Key Laboratory of Geomechanics and Geotechnical Engineering, Chinese Academy of Sciences, Wuhan 430071, China
  • Received:2005-03-31 Published:2016-07-01 Online:2016-07-11

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摘要： 为指导水力压裂施工,用FDEM-flow方法对多孔水力压裂问题进行了研究。研究结果显示:当H2孔的水压较小时,由H1孔出发的裂缝几乎不朝H2孔偏转;当H2孔的水压较大时,H1孔出发朝下扩展的裂缝,向H2孔偏转明显;当H1,H3孔同步增大水压时,H1出发向下扩展的裂缝朝H3孔偏转,H3孔出发向上扩展的裂缝朝H1孔偏转,最终在H1孔和H3孔间形成2条相向扩展的裂缝。上述研究结果表明:水力压裂裂缝的走向会受到相邻孔的干涉,可以通过相邻孔应力干扰控制压裂裂缝的走向;同时相邻孔的干涉,可以降低注水孔的起裂水压力,这也从侧面说明了同步压裂技术的合理性。

关键词: FEMDEM, FDEM-flow, 多孔水力压裂, 同步压裂, 裂缝, 应力干扰

Abstract: In order to instruct construction of hydraulic fracturing, with the proposed FDEM-flow method, we studied multi-hole hydraulic fracturing. When the pressure of hole H2 is small, crack starting from hole H1 hardly deflects toward hole H2; when water pressure of H2 is large, crack starting from H1 propagates to H2 obviously; while when pressures of H1 and H3 increase synchronously, crack extended downward from hole H1 deflects towards hole H3, and crack starting from hole H3 develops towards hole H1, and finally, two opposing propagation cracks form between H1 and H3. Results show that, direction of hydraulic fracturing cracks will be interfered by adjacent holes, hence the direction can be controlled through adjusting the pressure of adjacent holes; while the initiation water pressure that crack begins to occur can be reduced through the adjacent interference, which validated the rationality of synchronous hydraulic fracturing technology.

Key words: FEMDEM, FDEM-flow, multi-hole hydraulic fracturing, synchronous fracturing, fracture, stress interference

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