Experimental observations of matrix swelling area propagation on permeability evolution using natural and reconstituted samples

被引:39
作者
Liu, Qingquan [1 ,2 ,3 ,4 ]
Cheng, Yuanping [1 ,4 ]
Ren, Ting [4 ]
Jing, Hongwen [3 ]
Tu, Qingyi [1 ]
Dong, Jun [1 ]
机构
[1] China Univ Min & Technol, Minist Educ, Key Lab Coal Methane & Fire Control, Xuzhou 221116, Peoples R China
[2] China Univ Min & Technol, State Key Lab Coal Resources & Safe Min, Beijing 100083, Peoples R China
[3] China Univ Min & Technol, State Key Lab Geomech & Deep Underground Engn, Xuzhou 221008, Peoples R China
[4] Univ Wollongong, Sch Civil Min & Environm Engn, Wollongong, NSW 2522, Australia
基金
中国博士后科学基金;
关键词
Coal permeability; Equilibration time; Swelling area; Stress sensitivity; Natural coal; Reconstituted coal; COAL PERMEABILITY; CARBON-DIOXIDE; METHANE; STRAIN; GAS; IMPACT; MOVEMENT; MODEL;
D O I
10.1016/j.jngse.2016.07.035
中图分类号
TE [石油、天然气工业]; TK [能源与动力工程];
学科分类号
0807 ; 0820 ;
摘要
Many researchers have concluded that the permeability should be measured after the adsorption equilibrium state is reached and in many permeability models, it is normally assumed that pm (pressure in the coal matrix) is equalized with p(f)(pressure in the fractures). However, when the dynamic balance between pm and pf is broken which exists in most coalbed methane engineering, the differences between the two pressures induced by gas diffusion and matrix shape factor will generate nonuniform matrix swelling which have not been well learned to date, thus influence the permeability evolution. It is of great importance to investigate this issue on account of it will play a more important role in CO2-enhanced coalbed methane and CO2 sequestration engineering as the coal adsorption capacity for CO2 is considerably higher than that for CH4. To achieve this target, a series of novel coal permeability tests and simultaneous strain measurements were conducted using both natural coal and reconstituted coal. In these experiments, the radial strain evolution characteristics and the permeability evolution characteristics as a function of the adsorption equilibrium time and confining pressure were obtained. Based on the experimental results, the effects of the differences between pm and pf on radial strain evolution and coal permeability evolution were discussed, and a new matrix swelling area propagation theory was achieved. In addition, the differences between natural coal and reconstituted coal in terms of their matrix swelling and stress sensitivity properties were obtained. (C) 2016 Elsevier B.V. All rights reserved.
引用
收藏
页码:680 / 688
页数:9
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