Effects of Coal Deformation on Different-Phase CO2 Permeability in Sub-Bituminous Coal: An Experimental Investigation
Abstract
:1. Introduction
2. Experimental Method
2.1. Geological Setting
2.2. Sample Description
2.3. Experimental Apparatus
2.3.1. Permeability Testing Apparatus
2.3.2. Adsorption Experimental Apparatus
2.4. Experimental Procedure
2.4.1. Permeability Tests
2.4.2. Adsorption and Coal Swelling Test
2.5. Permeability Equations for Sub-Critical and Sup-Critical CO2
3. Results and Analysis
3.1. Sub-Critical, Super-Critical, and Mixed-Phase CO2 Flow Behavior
3.2. Sub-Critical, Super-Critical, and Mixed-Phase CO2 Permeability
4. Discussion
4.1. Mechanism and Behavior of Coal Swelling Due to Different-Phase CO2 Adsorption
4.1.1. Coal Swelling Mechanism Due to Different-Phase CO2 Adsorption
4.1.2. Coal Swelling Behavior Due to Different-Phase CO2 Adsorption
4.2. Mechanism and Behavior of Coal Deformation In Situ Conditions
4.2.1. Coal Deformation Mechanism In Situ Conditions
4.2.2. Coal Deformation Behavior In Situ Conditions
4.3. Effects of Coal Deformation on Permeability
4.4. Effect of Effective Stress on Coal Permeability
5. Conclusions
Author Contributions
Funding
Conflicts of Interest
References
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Rank | Country | Gas | Confining Pressure (MPa) | Gas Pressure (MPa) | Sample Size (mm) | Permeability (μm2) | Refs. |
---|---|---|---|---|---|---|---|
Anthracite | America | He, CH4, CO2 | 6–12 | 1–6 | φ25 × 46.7 | 10−10–10−6 | Wang et al. [10] |
Brown coal | Australia | N2, CO2 | 11–17 | 6–14 | φ38 × 76 | 10−9–10−7 | Ranathunga et al. [11] |
Bituminous | Australia | N2, CO2 | 5–20 | 2–9 | φ38 × 76 | 10−7–10−6 | Perera et al. [12] |
Bituminous | India | CO2 | 5–13 | 1–5 | φ39 × 76 | 10−7–10−5 | Vishal et al. [13] |
Bituminous | America | Ar, CO2 | 7–20 | 4–10 | φ37.45~50.4 × 19.15~80.1 | 10−6–10−3 | Siriwardane et al. [14] |
Bituminous | Australia | CH4, CO2 | 20 | 1–13 | φ45 × 105.5 | 10−4–10−3 | Pan et al. [15] |
Bituminous, semi-anthracite | France, Germany | CH4, CO2 | 7 | near 0–3.5 | φ50 | 10−6–10−4 | Sevket et al. [16] |
Bituminous | Japan | N2, CO2 | 2–12 | 0.1–11 | φ50 × 125 | 10−6–10−3 | Kiyama et al. [17] |
Bituminous | Australia | CH4, CO2 | 3.1–4.5 | 0.4–2 | 80 × 80 × 80 | 10−3 | Wang et al. [18] |
Bituminous | China | CH4, CO2 | 1.0–5.5 | 0.5–2 | 100 × 100 × 200 | 10−4–10−2 | Liang et al. [19] |
Coal Rank | Ro,max | Maceral Groups (Volume, %) | Mineral (Volume, %) | Proximate Analysis (%) | ||||||
---|---|---|---|---|---|---|---|---|---|---|
Vitrinite | Inertinite | Liptinite | Moisture | Ash Yield | Volatile Matter | Clay | Pyrite | Carbonate | ||
Sub-bituminous | 0.46 | 46.9 | 48.8 | 4.3 | 6.23 | 17.32 | 24.68 | 4.3 | 0.4 | 4.1 |
CO2 Phase | Confining Stress (MPa) | Temperature (°C) | Injection Pressure (MPa) | Downstream Pressure (MPa) | ||||||||||
---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
Sub-critical condition | 8 | 50 | 1 | 1.5 | 2 | 2.5 | 3 | 3.5 | 4 | 4.5 | 5 | 5.5 | 6 | 0.1 |
10 | 50 | 1 | 1.5 | 2 | 2.5 | 3 | 3.5 | 4 | 4.5 | 5 | 5.5 | 6 | 0.1 | |
Super-critical condition | 18 | 50 | 10 | 11 | 12 | 13 | 14 | 15 | 8 | |||||
20 | 50 | 10 | 11 | 12 | 13 | 14 | 15 | 8 |
CO2 Phase | Confining Stress (MPa) | Temperature (°C) | Injection Pressure (MPa) | Downstream Pressure (MPa) | ||||||||||
---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
Sub-critical and super-critical | 20 | 50 | 10 | 0.1 | 1 | 2 | 3 | 4 | 5 | 6 | 7 | 8 | 9 | |
20 | 50 | 11 | 0.1 | 1 | 2 | 3 | 4 | 5 | 6 | 7 | 8 | 9 | 10 |
CO2 Phase | Pressure Difference (MPa) | ||||||||||
---|---|---|---|---|---|---|---|---|---|---|---|
Sub-critical a | 0.9 | 1.4 | 1.9 | 2.4 | 2.9 | 3.4 | 3.9 | 4.4 | 4.9 | 5.4 | 5.9 |
Super-critical b | 2 | 3 | 4 | 5 | 6 | 7 | |||||
Mixed-phase c | 9.9 | 9 | 8 | 7 | 6 | 5 | 4 | 3 | 2 | 1 | |
Mixed-phase d | 10.9 | 10 | 9 | 8 | 7 | 6 | 5 | 4 | 3 | 2 | 1 |
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Zhang, B.; Liang, W.; Ranjith, P.G.; He, W.; Li, Z.; Zhang, X. Effects of Coal Deformation on Different-Phase CO2 Permeability in Sub-Bituminous Coal: An Experimental Investigation. Energies 2018, 11, 2926. https://doi.org/10.3390/en11112926
Zhang B, Liang W, Ranjith PG, He W, Li Z, Zhang X. Effects of Coal Deformation on Different-Phase CO2 Permeability in Sub-Bituminous Coal: An Experimental Investigation. Energies. 2018; 11(11):2926. https://doi.org/10.3390/en11112926
Chicago/Turabian StyleZhang, Beining, Weiguo Liang, Pathegama Gamage Ranjith, Wei He, Zhigang Li, and Xiaogang Zhang. 2018. "Effects of Coal Deformation on Different-Phase CO2 Permeability in Sub-Bituminous Coal: An Experimental Investigation" Energies 11, no. 11: 2926. https://doi.org/10.3390/en11112926