文献类型：期刊文献

英文题名：The mechanism of permeability enhancement of coal seams by hydraulic fracturing based on the characterization of coal physical properties

作者：Zhao, Xun Zhao, Dan Nie, Baisheng Liu, Xianfeng Liu, Peng Wang, Mengxia Hu, Bei Li, Hongsheng Deng, Chuan Duan, Zhengpeng

第一作者：Zhao, Xun;赵训

通信作者：Zhao, D[1]

机构：[1]Guizhou Inst Technol, Inst Min Engn, Guiyang 550025, Peoples R China;[2]Chongqing Univ, Sch Resources & Safety Engn, Chongqing 400044, Peoples R China;[3]China Univ Min & Technol Beijing, Sch Emergency Management & Safety Engn, Beijing 100083, Peoples R China;[4]Guizhou Mine Safety Sci Res Inst Co Ltd, Guiyang 550025, Peoples R China

第一机构：贵州理工学院矿业工程学院

通信机构：corresponding author), Chongqing Univ, Sch Resources & Safety Engn, Chongqing 400044, Peoples R China.

年份：2025

卷号：15

期号：1

外文期刊名：SCIENTIFIC REPORTS

收录：;Scopus(收录号：2-s2.0-105011770006);WOS:【SCI-EXPANDED(收录号:WOS:001537650500018)】；

基金：This work was supported by Science and Technology Program of Guizhou Province (Qianke Support [2023] General 360) and Natural Science Foundation of Chongqing(Grant no. CSTB2024NSCQ-MSX0511).

语种：英文

外文关键词：Hydraulic Flushing; Permeability enhancement measure; Microscopic structure; Gas extraction; Particle size analysis

摘要：To further understand the mechanism of pressure relief and permeability enhancement in coal seams through hydraulic punching, this study employs microscopic testing methods such as porosity testing, spectral analysis, and image scanning, combined with simulation techniques, to analyze the impact of hydraulic punching on both the macro- and microstructures of coal from a microscopic perspective. The results indicate that the particle size distribution of the punch samples is similar to that of the original coal and drilled samples, with differences only in the larger particle size range. The impact damage during drilling and punching is mechanical in nature and primarily affects the macro dimensions of the coal. The punching process significantly modifies the internal microporous and chemical structures of coal, greatly increasing the number of micropores larger than 1.1 nm. Additionally, the punching process introduces secondary structural defects in the macromolecular structure of coal, leading to an increase in disordered carbon structures within the coal samples. The hydraulic punching process primarily achieves pressure relief and permeability enhancement through both macrofractures and micropores. This study integrates both microscopic and macroscopic perspectives to analyze the effects of hydraulic punching on pressure relief and permeability enhancement in coal.