静水压力对岩石在等离子体冲击下压裂效果的影响

付荣耀 孙鹞鸿 徐旭哲 严萍

付荣耀, 孙鹞鸿, 徐旭哲, 严萍. 静水压力对岩石在等离子体冲击下压裂效果的影响[J]. 爆炸与冲击, 2018, 38(5): 1051-1056. doi: 10.11883/bzycj-2017-0057
引用本文: 付荣耀, 孙鹞鸿, 徐旭哲, 严萍. 静水压力对岩石在等离子体冲击下压裂效果的影响[J]. 爆炸与冲击, 2018, 38(5): 1051-1056. doi: 10.11883/bzycj-2017-0057
FU Rongyao, SUN Yaohong, XU Xuzhe, YAN Ping. Effect of hydrostatic pressure on fracture of rock subjected to plasma impact[J]. Explosion And Shock Waves, 2018, 38(5): 1051-1056. doi: 10.11883/bzycj-2017-0057
Citation: FU Rongyao, SUN Yaohong, XU Xuzhe, YAN Ping. Effect of hydrostatic pressure on fracture of rock subjected to plasma impact[J]. Explosion And Shock Waves, 2018, 38(5): 1051-1056. doi: 10.11883/bzycj-2017-0057

静水压力对岩石在等离子体冲击下压裂效果的影响

doi: 10.11883/bzycj-2017-0057
基金项目: 

国家自然科学基金项目 51577176

详细信息
    作者简介:

    付荣耀(1986-), 男, 博士研究生, 助理研究员, furongyao@mail.iee.ac.cn

  • 中图分类号: O347.3

Effect of hydrostatic pressure on fracture of rock subjected to plasma impact

  • 摘要: 为了了解与掌握深井下水中放电冲击波对岩石的破碎作用规律,建立了静水压力高达35 MPa的电脉冲压裂装置,可模拟深井近3 000 m下的围压,并进行了不同静水压下等离子体冲击压裂实验。电脉冲压裂装置最高工作电压20 kV,最大储能40 kJ。在0~25 MPa的静水压力条件下,对6块砂岩岩样进行了冲击压裂实验。实验结果表明,随着静水压力的升高,相同放电条件下压裂产生的裂缝长度和宽度明显降低。所以静水压力的升高将使得岩样损伤范围减小,孔隙度以及渗透率提升幅度下降。静水压力对冲击压裂后裂缝的形成、分布、生长具有明显的影响。与常压下形成的裂缝相比,施加围压后裂缝多集中在电极处,数量多,但是长度较短,存在不同程度的弯曲,甚至局部区域出现了环形裂缝。
  • 图  1  实验装置

    Figure  1.  Experimental equipment

    图  2  脉冲源电路结构图

    Figure  2.  Schematic of the pulsed power system

    图  3  砂岩岩样

    Figure  3.  Sandstone samples

    图  4  砂岩试样CO1压裂图片

    Figure  4.  Fracture pictures of sandstone samples CO1

    图  5  岩样1裂缝图片

    Figure  5.  Fracture pictures of sandstone sample 1

    图  6  岩样2裂缝图片

    Figure  6.  Fracture pictures of sandstone sample 2

    图  7  岩样3裂缝图片

    Figure  7.  Fracture pictures of sandstone sample 3

    图  8  岩样4裂缝图片

    Figure  8.  Fracture pictures of sandstone sample 4

    图  9  岩样5裂缝图片

    Figure  9.  Fracture pictures of sandstone sample 5

    表  1  压裂实验数据

    Table  1.   Data for fracture experiments

    砂岩编码 静水压力/MPa 工作电压/kV 放电次数 单次放电能量/kJ 裂缝高度/mm 裂缝径向长度/mm 井内裂缝条数
    1 5 15 5 22.5 200 190,150 5
    18 8 32.4
    2 10 13 4 16.9 200 20,30 3
    15 3 22.5
    18 10 32.4
    15 4 22.5
    18 15 32.4
    3 15 18 20 32.4 200 170,170 5,一条主缝
    4 20 15 12 22.5 170 60,50 4
    18 5 32.4
    5 25 18 20 32.4 110 5 多裂缝,一条主缝
    CO1 0 15 5 22.5 350 70 一条主缝
    下载: 导出CSV
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出版历程
  • 收稿日期:  2017-02-22
  • 修回日期:  2017-04-24
  • 刊出日期:  2018-09-25

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