Modeling and Analysis on Coal Permeability Considering the Mineral Dissolution Caused by Flue Gas in Fractures

IF 5.2 3区 工程技术 Q2 ENERGY & FUELS
Yu Shi, Baiquan Lin, Ting Liu* and Yang Zhao, 
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引用次数: 0

Abstract

Permeability enhancement by injecting acidified flue gas to dissolve minerals within coal fractures offers a novel approach to solve the problem of gas drainage from deep, strongly adsorbent, and low-permeability coal seams. However, the dynamic response mechanisms of the internal expansion coefficient, fracture bulk modulus, and permeability during mineral dissolution in coal fractures remain unclear. To address this problem, we constructed a permeability model that considers the dynamic changes of the internal expansion coefficient and fracture bulk modulus during mineral dissolution based on the “matrix-rock bridge-fracture” physical model of coal. Then, the permeability changes of mineral-containing coal under a constant gas pressure, a constant effective stress, and a constant confining pressure at different reaction times were tested and analyzed using the self-built CO2–H2O–Coal interaction and permeability test system. Based on the fitting results between the constructed permeability model and the experimental data, we delved into the dynamic evolution patterns of the internal expansion coefficient and the fracture bulk modulus during mineral dissolution in coal fractures. Ultimately, the separate and coupling influences of key parameters of the model (soluble mineral content variation, initial fracture porosity, Langmuir strain constant, Langmuir pressure constant, and average molar volume of soluble minerals) on the coal permeability were clarified by utilizing local and global sensitivity analysis of the verified permeability model. This study can provide a theoretical reference for engineering permeability enhancement by mineral dissolution using flue gas.

Abstract Image

考虑裂隙中烟气矿物溶蚀的煤渗透率建模与分析
通过注入酸化烟气溶解煤层裂缝中的矿物来提高渗透率,为解决深部强吸附性低渗透煤层瓦斯抽采问题提供了一条新途径。然而,煤裂隙中矿物溶解过程中内部膨胀系数、裂隙体积模量和渗透率的动态响应机制尚不清楚。为解决这一问题,基于煤的“基质-岩桥-裂隙”物理模型,构建了考虑矿物溶解过程中内部膨胀系数和裂隙体积模量动态变化的渗透率模型。然后,利用自建的CO2-H2O-Coal相互作用及渗透率测试系统,测试分析了含矿物煤在恒定瓦斯压力、恒定有效应力和恒定围压下不同反应时间下的渗透率变化。基于所建立的渗透率模型与实验数据的拟合结果,探讨了煤裂隙中矿物溶解过程中内部膨胀系数和裂隙体积模量的动态演化规律。最后,通过对验证渗透率模型的局部和全局敏感性分析,阐明了模型关键参数(可溶矿物含量变化、初始裂缝孔隙度、Langmuir应变常数、Langmuir压力常数和可溶矿物平均摩尔体积)对煤渗透率的分离和耦合影响。该研究可为烟气矿物溶解增透工程提供理论参考。
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来源期刊
Energy & Fuels
Energy & Fuels 工程技术-工程:化工
CiteScore
9.20
自引率
13.20%
发文量
1101
审稿时长
2.1 months
期刊介绍: Energy & Fuels publishes reports of research in the technical area defined by the intersection of the disciplines of chemistry and chemical engineering and the application domain of non-nuclear energy and fuels. This includes research directed at the formation of, exploration for, and production of fossil fuels and biomass; the properties and structure or molecular composition of both raw fuels and refined products; the chemistry involved in the processing and utilization of fuels; fuel cells and their applications; and the analytical and instrumental techniques used in investigations of the foregoing areas.
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