A Stochastic Method to Estimate the Anisotropic Stress-Dependent Coal Permeability by Pore-Volume Distribution and Stress-Strain Measurements
- Syed Shabbar Raza (The University of Queensland School of Chemical Engineering and The University of Queensland Centre for Natural Gas) | Victor Rudolph (The University of Queensland School of Chemical Engineering and The University of Queensland Centre for Natural Gas) | Tom Rufford (The University of Queensland School of Chemical Engineering) | Zhongwei Chen (The University of Queensland School of Mechanical & Mining Engineering)
- Document ID
- Society of Petroleum Engineers
- SPE Journal
- Publication Date
- October 2020
- Document Type
- Journal Paper
- 2,582 - 2,600
- 2020.Society of Petroleum Engineers
- mercury intrusion porosimetry, permeability, reservoir stress, mechanical strain
- 8 in the last 30 days
- 19 since 2007
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A novel, simple, economical, and time-effective method to estimate the anisotropic permeability of coal is presented in this paper. This method estimates the coal’s anisotropic permeability by avoiding the tedious experimentation using triaxial permeameter or history-matching exercises. This method calculates the absolute magnitude of the permeability of the sample. In this regard, it is unlike other analytical permeability models, such as given by Palmer and Mansoori (1998) and Shi and Durucan (2014), that only calculate the permeability ratio (k/k0). The motivation is to find a method by which the permeability of the coal may be determined with reasonable accuracy by using only two easy measurements: mercury intrusion porosimetry (MIP) and anisotropic stress-strain (s-e) measurement. The main blocks of the method are based on cleat size that is obtained from MIP and randomly allocated to form flow channels/cleats through the coal; these cleats form parallel paths in the orthogonal face and butt cleat directions that provide the permeability; and the cleat width (b) is stress dependent. This method is further validated by comparing with the experimentally measured stress-dependent permeability of Surat Basin (Australia) coal and German coal in face cleat and butt cleat directions.
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