Author:
Fang Hui-Huang,Sang Shu-Xun,Liu Shi-Qi
Abstract
Abstract
The three-dimensional (3D) structures of pores directly affect the CH4 flow. Therefore, it is very important to analyze the 3D spatial structure of pores and to simulate the CH4 flow with the connected pores as the carrier. The result shows that the equivalent radius of pores and throats are 1–16 μm and 1.03–8.9 μm, respectively, and the throat length is 3.28–231.25 μm. The coordination number of pores concentrates around three, and the intersection point between the connectivity function and the X-axis is 3–4 μm, which indicate the macro-pores have good connectivity. During the single-channel flow, the pressure decreases along the direction of CH4 flow, and the flow velocity of CH4 decreases from the pore center to the wall. Under the dual-channel and the multi-channel flows, the pressure also decreases along the CH4 flow direction, while the velocity increases. The mean flow pressure gradually decreases with the increase of the distance from the inlet slice. The change of mean flow pressure is relatively stable in the direction horizontal to the bedding plane, while it is relatively large in the direction perpendicular to the bedding plane. The mean flow velocity in the direction horizontal to the bedding plane (Y-axis) is the largest, followed by that in the direction horizontal to the bedding plane (X-axis), and the mean flow velocity in the direction perpendicular to the bedding plane is the smallest.
Subject
Economic Geology,Geochemistry and Petrology,Geology,Geophysics,Energy Engineering and Power Technology,Geotechnical Engineering and Engineering Geology,Fuel Technology
Reference48 articles.
1. Bird MB, Butler SL, Hawkes CD, et al. Numerical modeling of fluid and electrical currents through geometries based on synchrotron X-ray tomographic images of reservoir rocks using Avizo and COMSOL. Comput Geosci. 2014;73:6–16.
https://doi.org/10.1016/j.cageo.2014.08.009
.
2. Blunt MJ. Flow in porous media-pore-network models and multiphase flow. Curr Opin Colloid Interface. 2001;6(3):197–207.
https://doi.org/10.1016/S1359-0294(01)00084-X
.
3. Fang HH, Sang SX, Wang JL, et al. Simulation of paleotectonic stress fields and distribution prediction of tectonic fractures at the Hudi coal mine, Qinshui basin. Acta Geol Sin Engl. 2017;91(6):2007–23.
https://doi.org/10.3969/j.issn.1000-9515.2017.06.005
.
4. Fang HH, Sang SX, Liu SQ, et al. Study of digital petrophysical analysis method based on micro-focus X-ray tomography: a case study from No.3 coal seam of Bofang mining area in southern Qinshui basin. Coal Geol Explor. 2018;46(5):167–74 (in Chinese).
5. Fang HH, Sang SX, Liu SQ, et al. Experimental simulation of replacing and displacing CH4 by injecting supercritical CO2 and its geological significance. Int J Greenh Gas Control. 2019;81:115–25.
https://doi.org/10.1016/j.ijggc.2018.12.015
.
Cited by
24 articles.
订阅此论文施引文献
订阅此论文施引文献,注册后可以免费订阅5篇论文的施引文献,订阅后可以查看论文全部施引文献