Study on the water transport characteristics during spontaneous imbibition and its impact on gas desorption

作者：Aitao Zhou, Yongxin Sun, Kai Wang, Zhaofeng Wang, Shujun Ma, Yida Wang, Yuehui Liang · 发表于：Physics of Fluids · 年份：2024 · DOI：10.1063/5.0221561 · 被引用次数：9 · 研究领域：Coal Properties and Utilization、Rock Mechanics and Modeling、Geoscience and Mining Technology

During the exploitation of deep coal resources, the gas hazard becomes increasingly significant, severely threatening the high-quality development of the coal industry and the occupational safety and health of miners. Coal seam water injection is underground coal mines' most commonly used dust control measure. Additionally, it is an effective method for preventing localized coal and gas outburst hazards. After injecting water into the coal seam, spontaneous imbibition causes the retained water in the fractures to migrate under capillary action and widely distribute the water within the coal seam, which enhances the wetting degree of the coal by water and the effectiveness of gas prevention. To reveal the migration characteristics of water in the coal during spontaneous imbibition and its impact on gas control, a self-developed gas-bearing coal spontaneous imbibition system was used to conduct isobaric water injection imbibition and gas desorption experiments on gas-bearing coal samples. The results showed that after the water was injected into the coal sample, it migrated from bottom to top under capillary action, resulting in three stages of abrupt, rapid, and gradual changes in the electrical resistivity of different layers of the coal sample over time. The migration distance of water increased with the imbibition time, but the rate of increase gradually decreased. The compaction load increase reduced the coal sample's average pore size, resulting in faster water migration ...