Anisotropic coal permeability estimation by determining cleat compressibility using mercury intrusion porosimetry and stress–strain measurements

Raza, Syed Shabbar and Ge, Lei and Rufford, Thomas E. and Chen, Zhongwei and Rudolph, Victor (2019) Anisotropic coal permeability estimation by determining cleat compressibility using mercury intrusion porosimetry and stress–strain measurements. International Journal of Coal Geology, 205. pp. 75-86. ISSN 0166-5162

Abstract

This paper presents a novel method to calculate the anisotropic and stress-dependent coal permeability by determining cleat compressibility using the Mercury Intrusion Porosimetry (MIP) and stress–strain measurements. Cleat compressibility is often assumed isotropic and constant in the literature and is usually obtained by numerical fitting to a matchstick permeability model e.g. the model by Seidle et al. (1992) despite the gross simplification of this representation of the coal pore network. This paper provides a method to calculate anisotropic cleat compressibility using only MIP and stress–strain measurements which are easy to conduct, and without permeability information, which is harder to come by, requiring laboratory experiments on the core or through fitting field data. We report the measured stress–strain behaviour of a coal sample, with hydrodynamic loading/unloading over the range 0.5–4.0 MPa, and the permeability in face cleat (kF) and butt cleat (kB) directions using the Triaxial Stress Permeameter (TSR). The stress–strain measurement is used to calculate the anisotropic modulus of elasticity (EF, EB, and EV) in face cleat, butt cleat and bedding plane directions, and cleat compressibility in the face cleat (CfF) and butt cleat (CfB) directions using the fractal dimension analysis with MIP measurement. Finally, the cleat compressibilities are used to calculate the anisotropic coal permeability by Seidle et al. (1992) permeability model and compared with the measured permeability of the coal sample.


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Item Type: Article (Commonwealth Reporting Category C)
Refereed: Yes
Item Status: Live Archive
Additional Information: Published version cannot be displayed due to copyright restrictions.
Faculty/School / Institute/Centre: Current - Institute for Advanced Engineering and Space Sciences - Centre for Future Materials (1 Jan 2017 -)
Faculty/School / Institute/Centre: Current - Institute for Advanced Engineering and Space Sciences - Centre for Future Materials (1 Jan 2017 -)
Date Deposited: 28 Aug 2019 01:41
Last Modified: 10 Sep 2019 04:38
Uncontrolled Keywords: geomechanical properties; matrix; sorption; adsorption; model; co2
Fields of Research : 03 Chemical Sciences > 0306 Physical Chemistry (incl. Structural) > 030607 Transport Properties and Non-equilibrium Processes
09 Engineering > 0914 Resources Engineering and Extractive Metallurgy > 091406 Petroleum and Reservoir Engineering
Socio-Economic Objective: B Economic Development > 85 Energy > 8502 Mining and Extraction of Energy Resources > 850203 Oil and Gas Extraction
Identification Number or DOI: 10.1016/j.coal.2019.02.011
URI: http://eprints.usq.edu.au/id/eprint/36166

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