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    基于扩展有限元法的碳酸盐岩地热储层岩体裂缝扩展行为

    王伟 付豪 邢林啸 柴波 刘波 施星宇

    王伟, 付豪, 邢林啸, 柴波, 刘波, 施星宇, 2021. 基于扩展有限元法的碳酸盐岩地热储层岩体裂缝扩展行为. 地球科学, 46(10): 3509-3519. doi: 10.3799/dqkx.2021.005
    引用本文: 王伟, 付豪, 邢林啸, 柴波, 刘波, 施星宇, 2021. 基于扩展有限元法的碳酸盐岩地热储层岩体裂缝扩展行为. 地球科学, 46(10): 3509-3519. doi: 10.3799/dqkx.2021.005
    Wang Wei, Fu Hao, Xing Linxiao, Chai Bo, Liu Bo, Shi Xingyu, 2021. Crack Propagation Behavior of Carbonatite Geothermal Reservoir Rock Mass Based on Extended Finite Element Method. Earth Science, 46(10): 3509-3519. doi: 10.3799/dqkx.2021.005
    Citation: Wang Wei, Fu Hao, Xing Linxiao, Chai Bo, Liu Bo, Shi Xingyu, 2021. Crack Propagation Behavior of Carbonatite Geothermal Reservoir Rock Mass Based on Extended Finite Element Method. Earth Science, 46(10): 3509-3519. doi: 10.3799/dqkx.2021.005

    基于扩展有限元法的碳酸盐岩地热储层岩体裂缝扩展行为

    doi: 10.3799/dqkx.2021.005
    基金项目: 

    国家自然科学基金项目 41702304

    国家自然科学基金项目 41877253

    详细信息
      作者简介:

      王伟(1989-), 男, 博士, 副教授, 主要从事工程地质、水文地质、环境地质领域的研究.ORCID: 0000-0001-6980-1576.E-mail: wangw@cug.edu.cn

    • 中图分类号: P642

    Crack Propagation Behavior of Carbonatite Geothermal Reservoir Rock Mass Based on Extended Finite Element Method

    • 摘要: 水力压裂作为一种主要的地热能开采手段,其压裂效果除与岩体基本物理力学性质有关外,还与裂隙分布、地应力状态、压裂工程参数等密切相关.为了探究以上因素对水力压裂过程中裂缝扩展行为的影响,以冀中坳陷碳酸盐岩储层岩体为研究对象,基于扩展有限元法,建立裂缝扩展流固耦合模型,分析了水平应力差、射孔方位角、注入液排量和压裂液黏度等参数对裂缝扩展行为的影响.结果表明:单裂缝扩展时,射孔方位角越小、注入量越大、越有利于裂缝扩展;双裂缝扩展时,水平应力差增大,裂缝偏转程度变小;水力裂缝与天然裂缝相交时,较小水平应力差有利于天然裂缝开启.

       

    • 图  1  单裂缝水力压裂模型

      Fig.  1.  Single fracture hydraulic fracturing model

      图  2  不同射孔方位角条件下单裂缝扩展形态云图

      a. θ=0°;b. θ=15°;c. θ=30°;d. θ=45°

      Fig.  2.  Cloud image of single fracture propagation under different perforation azimuth

      图  3  不同射孔方位角条件下裂缝扩展关键参数变化曲线

      Fig.  3.  Variation curve of key parameters of fracture propagation under different perforation azimuth

      图  4  不同水平应力差条件下裂缝扩展关键参数变化曲线

      Fig.  4.  Variation curves of key parameters of crack propagation under different horizontal stresses differences

      图  5  不同压裂液注入量条件下裂缝扩展关键参数变化曲线

      Fig.  5.  Variation curves of key parameters of fracture propagation under different fracturing fluid injection rates

      图  6  不同压裂液黏度条件下裂缝扩展关键参数变化曲线

      横坐标采用log10对数坐标

      Fig.  6.  Variation curves of key parameters of fracture propagation under different fracturing fluid viscosity conditions

      图  7  双裂缝水力压裂模型

      Fig.  7.  Double fracture hydraulic fracturing model

      图  8  不同初始裂缝长度条件下双裂缝扩展形态云图

      a. l=1;b. l=2;c. l=3;d. l=4

      Fig.  8.  Cloud map of double fracture propagation under different initial fracture length conditions

      图  9  不同初始裂缝间距条件下双裂缝扩展形态云图

      a. d=2 m;b. d=4 m;c. d=6 m;d. d=8 m

      Fig.  9.  Cloud map of double fracture propagation under different initial fracture spacing conditions

      图  10  不同水平应力差条件下双裂缝扩展形态云图

      a. Δσ=2 MPa;b. Δσ=4 MPa;c. Δσ=6 MPa;d. Δσ=8 MPa

      Fig.  10.  Cloud map of double fracture propagation pattern under different horizontal stress difference conditions

      图  11  水力裂缝与天然裂缝相交模型

      Fig.  11.  Intersection model of hydraulic fracture and natural fracture

      图  12  不同倾角天然裂缝条件下裂缝扩展形态云图

      a. θ=30°;b. θ=60°;c. θ=90°;d. θ=120°

      Fig.  12.  Cloud map of fracture propagation pattern under different inclination angles of natural fractures

      图  13  不同水平应力差条件下裂缝扩展形态云图

      a. Δσ=0 MPa;b. Δσ=2 MPa;c. Δσ=4 MPa

      Fig.  13.  Cloud map of crack propagation pattern under different horizontal stress difference conditions

      表  1  冀中坳陷碳酸盐岩地热储层裂缝扩展流固耦合模型参数

      Table  1.   Fracture propagation fluid-solid coupling model parameters of carbonatite geothermal reservoirs in Jizhong depression

      最大水平主应力(MPa) 最小水平主应力(MPa) 抗拉强度(MPa) 孔隙比 弹性模量(GPa) 泊松比 压裂液黏度(Pa·s) 压裂液排量(m3/s) 射孔长度(m)
      8.0 6.0 7.0 0.1 20 0.24 0.001 0.002 1.0
      下载: 导出CSV
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