An improved permeability model of coal for coalbed methane recovery and CO2 geosequestration

被引:119
作者
Wang, G. X. [1 ]
Massarotto, P. [1 ]
Rudolph, V. [1 ]
机构
[1] Univ Queensland, Sch Engn, Brisbane, Qld 4072, Australia
基金
澳大利亚研究理事会;
关键词
Coal; Coalbed methane (CBM); CO2-enhanced CBM (ECBM); CO2; geosequestration; Directional permeability; Modeling; CLEAT; FLOW;
D O I
10.1016/j.coal.2008.10.007
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
An alternative approach is proposed to develop an improved permeability model for coalbed methane (CBM) and CO2-enhanced CBM (ECBM) recovery, and CO2 geosequestration in coal. This approach integrates the textural and mechanical properties to describe the anisotropy of gas permeability in coal reservoirs. The model accounts for the stress dependent deformation using a stress-strain correlation, which allows determination of directional permeability for coals. The stress-strain correlation was developed by combining mechanical strain with sorption-induced strain for any given direction. The mechanical strain of coal is described by the general thermo-poro-elastic constitutive equations for solid materials under isothermal conditions and the sorption-induced strain is approximated by treating the swelling/shrinkage of coal matrix equivalent to the thermal contraction/expansion of materials. With directional strains, the permeability of coal in any given direction can be modeled based on the theory of rock hydraulics. In this study, the proposed model was tested with both literature data and experiments. The experiments were carried out using a specially designed true tri-axial stress coal permeameter (TTSCP). The results show that the proposed model provides better predictions for the literature data compared with other conventional coal permeability models. The model also gives reasonable agreement between the predicted and measured stress-strains and directional permeabilities under laboratory conditions. (C) 2008 Elsevier B.V. All rights reserved.
引用
收藏
页码:127 / 136
页数:10
相关论文
共 34 条
  • [1] FLOW REGIMES AND RELATIVE PERMEABILITIES DURING STEADY-STATE 2-PHASE FLOW IN POROUS-MEDIA
    AVRAAM, DG
    PAYATAKES, AC
    [J]. JOURNAL OF FLUID MECHANICS, 1995, 293 : 207 - 236
  • [2] Bear J., 1972, Dynamics of fluids in porous media, P1
  • [3] Brady B.H., 1993, ROCK MECH UNDERGROUN
  • [4] DAVE N, 1990, AUSTR COAL REV, V8, P31
  • [5] Durucan S., 1986, Mining Science and Technology, V3, P205, DOI DOI 10.1016/S0167-9031(86)90357-9
  • [6] Gale J., 2001, ENV GEOSCIENCE, V8, P210, DOI [10.1046/j.1526-0984.2001.008003210.x, DOI 10.1046/J.1526-0984.2001.008003210.X]
  • [7] COAL MICROSTRUCTURE AND MICROPERMEABILITY AND THEIR EFFECTS ON NATURAL-GAS RECOVERY
    GAMSON, PD
    BEAMISH, BB
    JOHNSON, DP
    [J]. FUEL, 1993, 72 (01) : 87 - 99
  • [8] Geomechanical properties and permeability of coals from the Foothills and Mountain regions of western Canada
    Gentzis, Thomas
    Deisman, Nathan
    Chalaturnyk, Richard J.
    [J]. INTERNATIONAL JOURNAL OF COAL GEOLOGY, 2007, 69 (03) : 153 - 164
  • [9] Flow of coal-bed methane to a gallery
    Gilman, A
    Beckie, R
    [J]. TRANSPORT IN POROUS MEDIA, 2000, 41 (01) : 1 - 16
  • [10] Gray I., 1987, RESERVOIR ENG COAL S, P28, DOI [DOI 10.2118/12514-PA, 10.2118/12514-PA]