Petroleum Reservoir Evaluation and Development >
2020 , Vol. 10 >Issue 4: 81 - 86
DOI: https://doi.org/10.13809/j.cnki.cn32-1825/te.2020.04.012
Ultrasonic testing and evaluation method for hydraulic fracturing coal by voltage pulse
Received date: 2019-06-24
Online published: 2020-08-07
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
Xiankai BAO , Jiaxing CAO , Gang ZHAO , Junyu GUO , Yuan LIU , Jinchang ZHAO , Jinwen WU . Ultrasonic testing and evaluation method for hydraulic fracturing coal by voltage pulse[J]. Petroleum Reservoir Evaluation and Development, 2020 , 10(4) : 81 -86 . DOI: 10.13809/j.cnki.cn32-1825/te.2020.04.012
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