矿井甲烷排放的地球环境方面

IF 0.4 Q4 GEOSCIENCES, MULTIDISCIPLINARY
Serhii P. Mineev, Serhii А. Kurnosov, S. Makeiev, L. Novikov
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引用次数: 0

摘要

本工作旨在揭示气相对碳酸液体过滤过程的影响规律,表征矿井甲烷减排方法实施过程中的物理共化学过程。矿物的开发可能伴随着大量甲烷释放到采空区。这导致大气污染,从而造成生态紊乱。这导致甲烷通过岩石中气体和液体的过滤过程排放到开采空间和地球表面。流体通过裂缝和孔隙系统的过滤强度取决于流体的含量和性质以及岩石的储层性质。众所周知,在矿井封存后,可以观察到甲烷释放到大气中。这是世界上许多正在开采煤炭、石油和天然气的国家面临的一个问题。因此,对甲烷生产和利用项目的投资很重要。流体过滤过程的研究有助于开发有效的甲烷回收方法,以及降低甲烷排放速度的方法。其结果是减少了空气污染,改善了环境状况。本文介绍了不同结构和质地岩石的过滤特性。考虑了碳酸液体(水-甲烷)在裂缝和孔隙中的过滤作用。研究发现,碳酸化液中甲烷浓度的增加导致水的相渗透系数降低,甲烷的相渗透系数增加。这种相渗变化特征导致甲烷在裂缝和孔隙中富集。得到了直线裂缝中碳酸液体平均滤过率与甲烷浓度和裂缝轴倾角的关系。确定碳酸化液体的平均上升过滤速度大于平均下降过滤速度。这是由于喷射力作用于液体中的气泡造成的。提出了一种通过对岩体进行物化处理来封堵甲烷渗漏的方法。通过在甲烷向地表运移的高风险区域形成气密层,可以实现甲烷封堵效果。其结果是减少了对采空区和环境的甲烷排放。当该方法实现时,聚合物溶液的固体产物进入揭露度大于6 μm的裂缝或平均直径为6 μm的孔道。同时,聚合物溶液的不稳定释放的水将甲烷阻挡在小裂缝和孔隙中。在平均直径小于25 μm的孔道中,聚合物溶液的动态粘度急剧增加。这种效应是由于聚合物溶液和过滤通道壁之间的分子间相互作用力的增加。聚合物溶液在裂缝和孔隙中的混凝和失稳是由于大分子团块的分离。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
Geoenvironmental aspects of mine methane emissions
The purpose of the work is to reveal the regularities of the influence of the gaseous phase on the process of filtering carbonated liquid and to characterize the physi-cochemical processes during the implementation of the method of reducing mine methane emissions. The development of minerals can be accompanied by the release of a large amount of methane into the mined-out space. This leads to atmospheric air pollution and consequently to ecological disturbances. This causes methane emissions to the mined-out space and to the surface of the earth cause by the filtration processes of gases and liquids in the rocks. The intensity of fluid filtration through crack and pore systems depends on the content and properties of the fluids and the reservoir properties of the rocks. It is known that methane release to the atmosphere can be observed after mines have been mothballed. This is a problem for many countries around the world where coal and oil and gas fields are being exploited. Investment in methane production and utilization projects is therefore important. Research on fluids filtration processes allow for the development of effective methane recovery methods, and ways to reduce methane emission speed. The result is the reduced air pollution and an improved environmental situation. The paper presents the filtration properties of rocks with different structures and textures. Filtration of carbonated liquid (water-methane) in fractures and pores is considered. It found that an increase in methane concentration in the carbonated liquid leads to a decrease in the phase permeability coefficient for water and an increase for methane. This character of change in phase permeability leads to methane accumulation in crack and pores. The dependence of the average carbonated liquid filtration rate in a rectilinear fracture on the methane concentration and the fracture axis angle of inclination is obtained. The average ascending filtration speed of the carbonated liquid is determined to be greater than the average descending filtration speed. This is due to the effect of the ejection force that acts on the gas bubbles in the liquid. The authors propose a method of blocking methane seepage by physicochemical treatment of the rock mass. The methane blocking effect is achieved by creating a gas-tight zone in areas with a high risk of methane migration to the ground surface. The result is a reduction in methane emissions to the mined-out space and the environment. When the method is realized, the solid product of the polymer solution enters cracks with a disclosure greater than 6 μm or pore channels with an average diameter of 6 μm. At the same time, the water released by the destabi- lization of the polymer solution blocks the methane in small cracks and pores. In pore channels with an average diameter of less than 25 μm, there is a sharp increase in the dynamic viscosity of the polymer solution. This effect is due to an increase in the intermolecular interaction forces between the polymer solution and the walls of the filtration channels. Coagulation and destabilization of the polymer solution in cracks and pores is due to the separation of large agglomerates of macromolecules.
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来源期刊
Journal of Geology Geography and Geoecology
Journal of Geology Geography and Geoecology GEOSCIENCES, MULTIDISCIPLINARY-
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