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

Abstract

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

CLC Number:

TE37

BAO Xiankai,CAO Jiaxing,ZHAO Gang,GUO Junyu,LIU Yuan,ZHAO Jinchang,WU Jinwen. Ultrasonic testing and evaluation method for hydraulic fracturing coal by voltage pulse[J].Reservoir Evaluation and Development, 2020, 10(4): 81-86.

Figures/Tables 9

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References 24

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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

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

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