电脉冲水压致裂煤岩超声波检测评价方法

doi:10.13809/j.cnki.cn32-1825/te.2020.04.012

油气藏评价与开发 ›› 2020, Vol. 10 ›› Issue (4): 81-86.doi: 10.13809/j.cnki.cn32-1825/te.2020.04.012

电脉冲水压致裂煤岩超声波检测评价方法

鲍先凯¹(),曹嘉星¹(),赵刚¹,郭军宇¹,刘源¹,赵金昌²,武晋文³

1.内蒙古科技大学土木工程学院,内蒙古包头 014010
2.太原理工大学矿业工程学院,山西太原 030024
3.中北大学理学院,山西太原 030051

收稿日期:2019-06-24 发布日期:2020-08-07 出版日期:2020-08-26
通讯作者: 曹嘉星 E-mail:bxkzlm@163.com;18947257406@163.com
作者简介:鲍先凯（1974 —）,男,博士,副教授,从事煤层气增产改造理论与技术研究。通讯地址：内蒙古自治区包头市阿尔丁大街7号,邮政编码：014000。E-mail: bxkzlm@163.com
基金资助:
国家自然基金青年科学基金项目“岩石高温三轴压裂机理研究”(51504220);内蒙古自然科学基金“基于高压电脉冲水压致裂的低渗透性煤层气解吸增透效果试验研究”(2016MS0511);山西省自然科学基金“静水压力作用下脉冲放电水激波不同速率动载组合致裂低渗透煤层机理研究”(201701D22111223)

Ultrasonic testing and evaluation method for hydraulic fracturing coal by voltage pulse

BAO Xiankai¹(),CAO Jiaxing¹(),ZHAO Gang¹,GUO Junyu¹,LIU Yuan¹,ZHAO Jinchang²,WU Jinwen³

1. School of Civil Engineering, Inner Mongolia University of Science and Technology, Baotou, Inner Mongolia 014010, China
2. College of Mining Engineering, Taiyuan University of Technology, Taiyuan, Shanxi 030024, China
3. School of Science, North University of China, Taiyuan, Shanxi 030051, China

Received:2019-06-24 Online:2020-08-07 Published:2020-08-26
Contact: CAO Jiaxing E-mail:bxkzlm@163.com;18947257406@163.com

摘要/Abstract

摘要：

为了定量评价电脉冲水力压裂煤岩体致裂效果,确定该技术适用于工程实践中的电压及水压的加载量,设计了电脉冲水压致裂超声波检测试验方案,并通过数值计算从损伤变量、裂缝扩展宽度两个评价指标定量表征该技术在不同加载条件下对煤岩体的致裂效果,及相较于单纯静水压力压裂的优越性。实验结果表明：①由于加载液电压力存在的波动性,其损伤程度在钻孔周围破坏最严重,随着波动压力的减弱,煤岩体损伤程度逐渐降低;②损伤变量及裂缝宽度与加载电压之间呈正相关关系,均随着电压的增加而增加;③通过损伤变量、裂缝宽度这两个指标定量分析了电脉冲水压致裂煤体效果,可为煤层气开采提供参考。

关键词: 电脉冲, 煤岩, 超声波, 液电耦合, 损伤变量, 裂缝宽度

Abstract:

In order to quantitatively evaluate the fracturing effect of hydraulic fracturing by voltage pulse on coal rocks, and determine that whether the technology is suitable for the voltage and water pressure loading in engineering practice or not, the voltage pulse hydraulic fracturing ultrasonic testing test is designed, the fracturing effect of this technique on coal rocks under different loading conditions is quantitatively characterized by the numerical calculation from damage variables and crack propagation width, and its advantages compared to the operation of hydrostatic fracturing merely is evaluated. The conclusions are as follows: ①Due to the fluctuation of load fluid electrical pressure, the damage degree around the borehole is the most serious, reducing with the decreases of the fluctuating pressure. ②The damage variables and crack width are positively correlated with the loading voltage, which increase with the increase of voltage. ③The fracturing effect of hydraulic fracturing by voltage pulse on coal is quantitatively analyzed from damage variable and crack width, which can provide reference for coalbed methane.

Key words: voltage pulse, coal rock, ultrasonic, liquid-electric coupling, damage variable, crack width

中图分类号:

TE37

鲍先凯,曹嘉星,赵刚等. 电脉冲水压致裂煤岩超声波检测评价方法[J]. 油气藏评价与开发, 2020, 10(4): 81-86.

Xiankai BAO,Jiaxing CAO,Gang ZHAO, et al. Ultrasonic testing and evaluation method for hydraulic fracturing coal by voltage pulse[J]. Reservoir Evaluation and Development, 2020, 10(4): 81-86.

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参数名称	参数值	参数名称	参数值
容重/（kN·m^-3）	15.15	内聚力/MPa	1.78
抗压强度/MPa	19.69	内摩擦角/（° ）	35
弹性模量/MPa	11 065	坚固性系数	2.8
泊松比	0.30×10^-6	抗拉强度/MPa	2.53

特征项目	特征描述
煤体结构	原生结构煤
光泽	明亮
构造特征	层状或条带状构造
节理性质	节理系统发达且有次序
节理面性质	节理面平整且被黄铁矿或方解石充填、次生节理面少
断口性质	贝壳状或阶梯状
强度	强度较高,用手难以掰开

试验编号	静水压力/MPa	电压/kV
1	3	0
2	3	9
3	3	11
4	3	13

电脉冲水压致裂煤岩超声波检测评价方法

Ultrasonic testing and evaluation method for hydraulic fracturing coal by voltage pulse

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