Abstract
A considerable amount of coalbed methane (CBM) that can be extracted by surface vertical wells exists in gobs of abandoned mines. A model of CBM enrichment and extraction in abandoned mine gobs during mine closure and methane extraction by surface vertical wells was established based on the migration law of CBM occurrence and time-varying diffusion in the dual-porosity medium of coal as well as the nonlinear seepage characteristics of CBM in gobs. The results are as follows. (1) During mine closure, the CBM pressure in the gob recovers gradually and stabilizes eventually; it decreases gradually from the gob interface with coal pillars to the gob center. The CBM pressure in the gob is correlated positively with the matrix pressure and diffusion coefficient of coal seam; compared with the permeability of the gob, these two factors exert greater impacts on CBM pressure recovery in the gob. (2) In the early stage of extraction, residual coal in the gob is the dominant mass source of CBM seepage. The closer the extraction well bottom is to the gob bottom, the wider the influence range of CBM extraction is, and the larger the CBM flow in the well is. The layout of surface wells, the negative extraction pressure and the extraction time can affect the production and recovery of CBM. The model in this study can provide a theoretical basis for the optimization of the layout of surface wells and the prediction on CBM enrichment and extraction in abandoned mine gobs.
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References
An, F. H., Cheng, Y., Wang, L., & Li, W. (2013). A numerical model for outburst including the effect of adsorbed gas on coal deformation and mechanical properties. Computers and Geotechnics, 54, 222–231.
Chen, D., Pan, Z. J., Liu, J. S., & Connell, L. D. (2012). Characteristic of anisotropic coal permeability and its impact on optimal design of multi-lateral well for coalbed methane production. Journal of Petroleum Science and Engineering, 88–89, 13–28.
Danesh, N. N., Chen, Z. W., Aminossadati, S. M., Kizil, M. S., Pan, Z. J., & Connell, L. D. (2016). Impact of creep on the evolution of coal permeability and gas drainage performance. Journal of Natural Gas Science and Engineering, 33, 469–482.
Feng, G. R., Hu, S. Y., Li, Z., Jiang, H. N., Zhang, Y. T., Xu, G., Wang, Z., & Kang, L. (2016). Distribution of methane enrichment zone in abandoned coal mine and methane drainage by surface vertical boreholes: A case study from China. Journal of Natural Gas Science and Engineering, 34, 767–778.
Feng, G. R., Li, Z., Hu, S. Y., Zhang, Y. T., Zhang, A., Gao, Q., Jiang, H. N., Guo, X. Q., Li, C., & Cui, J. Q. (2018a). Distribution of gob empty space for methane drainage during the longwall mining: A case study. Journal of Natural Gas Science and Engineering, 60, 112–124.
Feng, G. R., Zhang, A., Hu, S. Y., Cheng, J. W., Miu, X. Y., Hao, G. C., Han, D. D., Guan, S. W., & Zhao, G. Z. (2018b). A methodology for determining the methane flow space in abandoned mine gobs and its application in methane drainage. Fuel, 227, 208–217.
Gao, Q., Feng, G. R., Hu, S. Y., Jiang, H. N., Li, Z., & Cui, J. Q. (2018). Optimization of the surface vertical well of abandoned mine goafs based on gas seepage characteristics. Journal of Engineering Science and Technology Review, 11(2), 54–62.
Guo, P. K., Zheng, L. E., Sun, X. M., He, M. C., Wang, Y. W., & Shang, J. S. (2018). Sustainability evaluation model of geothermal resources in abandoned coal mine. Applied Thermal Engineering, 144, 804–811.
Harpalani, S., & Schraufnagel, R. A. (1990). Shrinkage of coal matrix with release of gas and its impact on permeability of coal. Fuel, 69(5), 551–556.
Hu, S. Y., Zhang, A., Feng, G. R., Guo, X. Q., Miu, X. Y., Li, C., Han, D. D., Wang, J., & Kang, L. X. (2018). Methane extraction from abandoned mines by surface vertical wells: A case study in China. Geofluids, 2018, 8043157.
Karacan, C. O. (2015). Analysis of gob gas venthole production performances for strata gas control in longwall mining. International Journal of Rock Mechanics and Mining Sciences, 79, 9–18.
Kholod, N., Evans, M., Pilcher, R. C., Roshchanka, V., Ruiz, F., Cote, M., & Collings, R. (2020). Global methane emissions from coal mining to continue growing even with declining coal production. Journal of Cleaner Production, 256, 120489.
Li, J., Huang, Q. M., Wang, G., & Wang, E. M. (2022a). Influence of active water on gas sorption and pore structure of coal. Fuel, 310, 66.
Li, W., Ren, T. W., Su, E. L., & Cheng, Y. P. (2018). Is the long-term sequestration of CO2 in and around deep, abandoned coal mines feasible? Proceedings of the Institution of Mechanical Engineers, Part A: Journal of Power and Energy, 232(1), 27–38.
Li, W., Su, E. L., Cheng, Y. P., Zhang, R., Liu, Z. D., Younger, P. L., & Pan, D. M. (2017). Analysis and prediction of gas recovery from abandoned underground coal mines in China. Environmental & Engineering Geoscience, 23(4), 331–342.
Li, W., Yang, K., Deng, D., Zhao, C. X., Yang, S. L., Cheng, Y. P., & Lu, S. Q. (2023). A lattice Boltzmann model for simulating gas transport in coal nanopores considering surface adsorption and diffusion effects. Fuel, 340, 127507.
Li, W., Yang, K., & Cheng, Y. P. (2022b). Dynamics model for fractionation of carbon isotopes of methane in the process of desorption and diffusion for gas in coal seams. Journal of the China Coal Society, 47(2), 849–859. (in Chinese).
Li, Z. Q., Liu, Y., Xu, Y. P., & Song, D. Y. (2016). Gas diffusion mechanism in multi-scale pores of coal particles and new diffusion model of dynamic diffusion coefficient. Journal of the China Coal Society, 41(3), 633–643. (in Chinese).
Liu, J. S., Chen, Z. W., Elsworth, D., Miao, X. X., & Mao, X. B. (2010). Evaluation of stress-controlled coal swelling processes. International Journal of Coal Geology, 83(4), 446–455.
Liu, Q. Q., Cheng, Y. P., Zhou, H. X., Guo, P. K., An, F. H., & Chen, H. D. (2015). A mathematical model of coupled gas flow and coal deformation with gas diffusion and klinkenberg effects. Rock Mechanics and Rock Engineering, 48(3), 1163–1180.
Liu, T., Lin, B. Q., Yang, W., Liu, T., Kong, J., Huang, Z. B., Wang, R., & Zhao, Y. (2017). Dynamic diffusion-based multifield coupling model for gas drainage. Journal of Natural Gas Science and Engineering, 44, 233–249.
Lu, M., & Connell, L. D. (2007). A model for the flow of gas mixtures in adsorption dominated dual porosity reservoirs incorporating multi-component matrix diffusion—Part I. Theoretical development. Journal of Natural Gas Science and Engineering, 59(1–2), 17–26.
Meng, Z. P., Shi, X. C., Liu, S. S., Tian, Y. D., & Li, C. (2016). Evaluation model of CBM resources in abandoned coal mine and its application. Journal of the China Coal Society, 41(3), 537–544. (in Chinese).
Mora, C. A., & Wattenbarger, R. A. (2009). Analysis and verification of dual porosity and CBM shape factors. Journal of Canadian Petroleum Technology, 48(02), 17–21.
Palchik, V. (2014). Time-dependent methane emission from vertical prospecting boreholes drilled to abandoned mine workings at a shallow depth. International Journal of Rock Mechanics and Mining Sciences, 72, 1–7.
Qin, W., Xu, J. L., & Hu, G. Z. (2015a). Optimization of abandoned gob methane drainage through well placement selection. Journal of Natural Gas Science and Engineering, 25, 148–158.
Qin, Z. Y., Yuan, L., Guo, H., & Qu, Q. D. (2015b). Investigation of longwall goaf gas flows and borehole drainage performance by CFD simulation. International Journal of Coal Geology, 150, 51–63.
Sang, S. X., Xu, H. J., Fang, L. C., Li, G. J., & Huang, H. Z. (2010). Stress relief coalbed methane drainage by surface vertical wells in China. International Journal of Coal Geology, 82(3–4), 196–203.
Shi, J. Q., Rubio, R. M., & Durucan, S. (2016). An improved void-resistance model for abandoned coal mine gas reservoirs. International Journal of Coal Geology, 165, 257–264.
Si, G., & Belle, B. (2019). Performance analysis of vertical goaf gas drainage holes using gas indicators in Australian coal mines. International Journal of Coal Geology, 216, 103301.
Sidiropoulou, M. G., Moutsopoulos, K. N., & Tsihrintzis, V. A. (2007). Determination of Forchheimer equation coefficients a and b. Hydrological Processes, 21(4), 534–554.
Wang, F. T., Ren, T., Tu, S. H., Hungerford, F., & Aziz, N. (2012). Implementation of underground longhole directional drilling technology for greenhouse gas mitigation in Chinese coal mines. International Journal of Greenhouse Gas Control, 11, 290–303.
Wang, J. G., Liu, J. S., & Kabir, A. (2013). Combined effects of directional compaction, non-Darcy flow and anisotropic swelling on coal seam gas extraction. International Journal of Coal Geology, 109–110, 1–14.
Warren, J. E., & Root, P. J. (1963). The behavior of naturally fractured reservoirs. Society of Petroleum Engineers Journal, 3(03), 245–255.
Wen, G. C., Sun, H. T., Li, R. F., Fu, J. H., & Zhao, X. S. (2018). Assessment method and application of coalbed methane resources in coal mining stability area. Journal of the China Coal Society, 43(1), 160–167. (in Chinese).
Xia, T. Q., Wang, X. X., Zhou, F. B., Kang, J. H., Liu, J. S., & Gao, F. (2015). Evolution of coal self-heating processes in longwall gob areas. International Journal of Heat and Mass Transfer, 86, 861–868.
Xia, T. Q., Zhou, F. B., Liu, J. S., Hu, S. Y., & Liu, Y. K. (2014). A fully coupled coal deformation and compositional flow model for the control of the pre-mining coal seam gas extraction. International Journal of Rock Mechanics and Mining Sciences, 72, 138–148.
Yang, W., Lin, B. Q., Qu, Y. A., Zhao, S. A., Zhai, C., Jia, L. L., & Zhao, W. Q. (2011). Mechanism of strata deformation under protective seam and its application for relieved methane control. International Journal of Coal Geology, 85(3–4), 300–306.
Yuan, L. M., & Smith, A. C. (2008). Numerical study on effects of coal properties on spontaneous heating in longwall gob areas. Fuel, 87(15), 3409–3419.
Zhang, H. B., Liu, J. S., & Elsworth, D. (2008). How sorption-induced matrix deformation affects gas flow in coal seams: A new FE model. International Journal of Rock Mechanics and Mining Sciences, 45(8), 1226–1236.
Zheng, G. Q., Han, J. Y., Sang, F. Y., Gao, T. X., Chen, D., & Zhang, Z. D. (2021). Case study of gas drainage well location optimization in abandoned coal mine based on reservoir simulation model. Environmental & Engineering Geoscience, 39(6), 1993–2005.
Acknowledgments
This research was supported by the Fundamental Research Funds for the National Natural Science Foundation of China (Grant No. 51874295) and International Cooperation and Exchange Program (Grant No. 51911530199, NSFC-RS). In addition, this project was also supported by the China Postdoctoral Science Foundation.
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Yang, K., Li, W., Gao, L. et al. Multiscale Transport Characteristics of Coalbed Methane in Abandoned Mines and Its Applications in Gas Recovery. Nat Resour Res 32, 1621–1637 (2023). https://doi.org/10.1007/s11053-023-10217-0
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DOI: https://doi.org/10.1007/s11053-023-10217-0