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高压电脉冲破岩机理数值模拟研究

刘伟吉 张有建 祝效华 冯文荣

刘伟吉, 张有建, 祝效华, 冯文荣. 高压电脉冲破岩机理数值模拟研究[J]. 矿业科学学报, 2023, 8(5): 642-653. doi: 10.19606/j.cnki.jmst.2023.05.006
引用本文: 刘伟吉, 张有建, 祝效华, 冯文荣. 高压电脉冲破岩机理数值模拟研究[J]. 矿业科学学报, 2023, 8(5): 642-653. doi: 10.19606/j.cnki.jmst.2023.05.006
Liu Weiji, Zhang Youjian, Zhu Xiaohua, Feng Wenrong. Numerical simulation study of rock breaking mechanism by high voltage electric pulse[J]. Journal of Mining Science and Technology, 2023, 8(5): 642-653. doi: 10.19606/j.cnki.jmst.2023.05.006
Citation: Liu Weiji, Zhang Youjian, Zhu Xiaohua, Feng Wenrong. Numerical simulation study of rock breaking mechanism by high voltage electric pulse[J]. Journal of Mining Science and Technology, 2023, 8(5): 642-653. doi: 10.19606/j.cnki.jmst.2023.05.006

高压电脉冲破岩机理数值模拟研究

doi: 10.19606/j.cnki.jmst.2023.05.006
基金项目: 

国家自然科学基金 52004229

国家自然科学基金 52034006

国家自然科学基金 52225401

国家自然科学基金 52274231

四川省区域创新合作项目 2022YFQ0059

四川省自然科学基金 23NSFSC2099

南充市与西南石油大学科技战略合作项目 SXHZ004

详细信息
    作者简介:

    刘伟吉(1989— ),男,四川成都人,博士,副教授,硕士生导师,主要从事油气钻井高效破岩理论与方法等方面的研究工作。Tel:13688465071,E-mail:lwj2017_swpu@163.com

    通讯作者:

    祝效华(1978— ),男,山东菏泽人,博士,教授,博士生导师,主要从事管柱力学和钻井提速等方面的研究工作。E-mail:zxhth113@163.com

  • 中图分类号: TE355

Numerical simulation study of rock breaking mechanism by high voltage electric pulse

  • 摘要: 高压电脉冲钻井技术目前已成为一种新型高效的岩石破碎方法,同时也是目前钻井提速领域的研究热点。为了推动高压电脉冲的破岩机理研究,建立了单对电极破碎红砂岩的多物理场耦合电击穿二维数值模型,通过电流场、电击穿场和电路场的耦合再现均质红砂岩中等离子体通道的产生,分析了电极倾角、电压、电极间距对岩石电击穿(岩石内部等离子体通道的形成)的影响规律。研究表明:等离子体通道由靠近放电电极顶端局部区域开始萌生,并朝着岩石局部介电强度薄弱处发展;随着加载脉冲电压值的增大,电击穿发生时刻逐步降低,岩石模型的等效失效体积逐渐增大;在保证岩石能被电击穿的前提下,增大电极间距能提高高压电脉冲的破岩效率;放电电极的电极倾角逐步增大的过程中,岩石等效失效体积出现明显的波动,其极值多数出现在电极倾角35°~55°的范围之内。为了进一步推动高压电脉冲破岩的工业化应用,在二维模型基础上构建了红砂岩的多物理场耦合动态电击穿三维数值模型,再现了电极钻头破岩过程中岩石内部破碎坑的状貌;与此同时,选用自主设计的同轴型电脉冲钻头开展了电击穿室内实验,电击穿室内实验结果与仿真实验结果相互印证。
  • 图  1  高压电脉冲破岩的两种基本方式

    Figure  1.  Two basic ways of rock breaking by high voltage electric pulse

    图  2  高压电脉冲破岩过程的三个阶段

    Figure  2.  Three stages of high voltage electric pulse rock breaking

    图  3  二维岩石电击穿数值模型

    Figure  3.  Two-dimensional numerical model of rock electrical breakdown

    图  4  等离子体通道萌生过程及形态

    Figure  4.  The initiation process and morphology of plasma channel

    图  5  加载不同脉冲电压岩石模型电击穿时刻与等效失效体积变化

    Figure  5.  Variation of electrical breakdown time and equivalent failure volume of rock model loaded with different pulse voltages

    图  6  不同脉冲电压、电极间距下,电极的岩石电击穿时刻和岩石等效失效体积变化

    Figure  6.  Rock breakdown time and equivalent failure volume of electrodes with different electrode spacing under various pulse voltages

    图  7  不同脉冲电压、电极倾角下,电极的岩石电击穿时刻和岩石等效失效体积变化

    Figure  7.  Rock breakdown time and equivalent failure volume of electrodes with different electrode inclination angles under various pulse voltages

    图  8  电极钻头三维动态电击穿模型的示意图

    Figure  8.  Three-dimensional dynamic electrical breakdown model of electrode drill

    图  9  三维电极钻头动态电击穿砂岩破碎坑状貌

    Figure  9.  Dynamic electric breakdown of sandstone fracture crater by three-dimensional electrode bit

    图  10  高压电脉冲室内电击穿实验平台

    Figure  10.  Experimental platform for electrical breakdown of high-voltage electrical pulse

    图  11  电击穿实验后砂岩试样破碎坑状貌

    Figure  11.  Fracture crater appearance of sandstone sample after electric breakdown experiment

    表  1  电极、水、岩石和绝缘套筒材料属性

    Table  1.   Material properties of electrode, water and insulating sleeve

    材料 相对介电常数 电导率/(S·m-1) 比热容/[J·(kg·K)-1] 密度/(kg·m-3) 导热系数/[W·(m·K)-1]
    80 0.001 25 4 180 1 000 0.59
    电极 1 5.7×107 385 8 960 400
    绝缘材料 4 0 1 700 1 150 0.26
    岩石 5 4×10-5 750 2 600 3.14
    下载: 导出CSV

    表  2  仿真实验各正交参数和变量的详细信息

    Table  2.   Specifics of orthogonal parameters and variables in simulation experiment

    变量种类 具体参数
    电极倾角θ/(°) 0 10 20 30 40 50 60 70 80 90
    电压U0/kV 100 110 120 130 140 150
    电极间距Ld/mm 10 12.5 15 17.5 20
    下载: 导出CSV

    表  3  砂岩岩样的材料参数

    Table  3.   Material parameters of sandstone samples

    参数项 砂岩
    参数值 单位
    杨氏模量 35 GPa
    泊松比 0.2
    相对介电常数 5
    电导率 4×10-5 S/m
    密度 2 500 kg/m3
    孔隙率 12%
    空间体积能密度阈值 5.5 kJ/m3
    下载: 导出CSV
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出版历程
  • 收稿日期:  2023-03-08
  • 修回日期:  2023-05-17
  • 刊出日期:  2023-10-31

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