Effects of pore pressure on coring-induced damage based on simulation by mesoscale stress-flow coupling numerical model
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Abstract
The deep in-situ environment is often characterized by high pore pressure, which will be released during traditional coring in deep rocks and lead to damage in rock samples. Hence, a novel coring technology has been proposed and systematically investigated for preserving in-situ conditions, including pore pressure, to obtain rock samples with high fidelity to the deep in-situ environment. To theoretically examine the variation in pore pressure after coring and evaluate its influence on rock samples, two kinds of mesoscopic model representing closed-pore and open-pore were established and analyzed by stress flow coupling, in which both seepage in porous matrix and flow in relatively bigger cavities are considered. An elastic-plastic-damage model associated with volumetric dilatation was introduced to reflect tensile damage. The influences of pore pressure after different kinds of coring were simulated by a series of conceptualized models, and the results revealed three kinds of situations: Pore pressure removal, pore pressure release, and pore pressure preservation. During traditional coring, the high pore pressure will neither be sealed completely nor released suddenly because the rock matrix has low permeability. The higher residual permeation pressure in the rock matrix will be caused by lower permeability, larger closed cavities or smaller open cavities. During traditional coring, the coring-induced inner damage arises nearby closed cavities. Both the damage value and the damage zone are increased with decreasing permeability. However, extra tensile damages rarely arise during in-situ pore pressure-preserved coring, which technology can also retain in-situ high pressure. Hence, the in-situ pore pressure-preserved coring technology has great significance for eliminating the distortion effect of coring to the greatest possible extent.
Document Type: Original article
Cited as: Zhao, L., Peng, R., Hao, P., Yang, Y., Zhou, H. Effects of pore pressure on coring-induced damage based on simulation by mesoscale stress-flow coupling numerical model. Advances in Geo-Energy Research, 2024, 14(3): 170-186. https://doi.org/10.46690/ager.2024.12.03
Keywords
References
Bruning, T., Karakus, M., Nguyen, G. D., et al. An experimental and theoretical stress-strain-damage correlation procedure for constitutive modelling of granite. Interntional Journal of Rock Mechanics and Mining Sciences, 2019, 116: 1-12.
Cao, Z., Gu, Q., Huang, Z., et al. Risk assessment of fault water inrush during deep mining. International Journal of Mining Science and Technology, 2022, 32(2): 423-434.
Chao, Z., Ma, G., He, K., et al. Investigating low-permeability sandstone based on physical experiments and predictive modeling. Underground Space, 2021, 6(4): 364-378.
Chen, X., Xue, S., Yuan, L. Coal seam drainage enhancement using borehole presplitting basting technology-a case study in huainan. International Journal of Mining Science and Technology, 2017, 27(5): 771-775.
Di, Q., Li, P., Zhang, M., et al. Three-dimensional theoretical analysis of seepage field in front of shield tunnel face. Underground Space, 2022, 7(4): 528-542.
Du, C., Sun, L., Guo, Y., et al. Experimental study on the coal damage characteristics of adsorption-instantaneous pressure relief in coal containing gases with different adsorption characteristics. Applied Sciences, 2019, 9(23): 5223.
Edwards, R. H. Stree concentrations around spheroidal inclusions and cavities. Journal of Applied Mechanics, 1951, 18(1): 19-30.
Gao, M., Chen, L., Fan, D., et al. Principle and technology of coring with in-situ pressure and gas maintaining in deep coal mine. Journal of China Coal Society, 2021, 46(3): 885-897. (in Chinese)
Golparvar, A., Zhou, Y., Wu, K., et al. A comprehensive review of pore scale modeling methodologies for multiphase flow in porous media. Advances in Geo-Energy Research, 2018, 2(4): 418-440.
Grassl, P., Jirasek, M. Damage-plastic model for concrete failure. International Journal of Solids and Structures, 2006, 43(22-23): 7166-7196.
Hokka, M., Black, J., Tkalich, D., et al. Effects of strain rate and confining pressure on the compressive behavior of kuru granite. International Journal of Impact Engineering, 2016, 91: 183-193.
La Spina, A., Foerster, C., Kronbichler, M., et al. On the role of (weak) compressibility for fluid-structure interaction solvers. International Journal for Numerical Methods in Fluids, 2020, 92(2): 129-147.
Liu, S., Wang, D., Yin, G., et al. Experimental study on the microstructure evolution laws in coal seam affected by temperature impact. Rock Mechanics and Rock Engineering, 2020, 53(3): 1359-1374.
Liu, S., Zhang, Y., Chi, Y., et al. Density characteristics of CO2-CH4 binary mixtures at temperatures from (300 to 308.15) K and pressures from (2 to 18) MPa. The Journal of Chemical Thermodynamics, 2017, 106: 1-9.
Li, W., Liu, S., Osher, S. Controlling conservation laws ii: Compressible navier-stokes equations. Journal of Computational Physics, 2022, 463: 111264.
Li, X., Cao, W., Su, Y. A statistical damage constitutive model for softening behavior of rocks. Engineering Geology, 2012, 143-144: 1-17.
Ma, Y., Cai, X., Yun, L., et al. Practice and theoretical and technical progress in exploration and development of shunbei ultra-deep carbonate oil and gas field, tarim basin, NW China. Petroleum Exploration and Develop ment, 2022, 49(1): 1-20.
Shen, Y., Ge, H., Zhang, X., et al. Impact of fracturing liquid absorption on the production and water-block unlocking for shale gas reservoir. Advances in Geo-Energy Research, 2018, 2(2): 163-172.
Tang, X., Ripepi, N., Stadie, N. P., et al. A dual-site langmuir equation for accurate estimation of high pressure deep shale gas resources. Fuel. 2016, 185: 10-17.
Wu, Z., Sun, Z., Shu, K., et al. Mechanism of shale oil displacement by CO2 in nanopores: A molecular dynamics simulation study. Advances in Geo-Energy Research, 2024, 11(2): 141-151.
Xie, H., Gao, M., Zhang, R., et al. Study on concept and progress of in situ fidelity coring of deep rocks. Chinese Journal of Rock Mechanics and Engineering, 2020, 39(5): 865-876. (in Chinese)
Xie, H., Li, C., He, Z., et al. Experimental study on rock mechanical behavior retaining the in situ geological conditions at different depths. International Journal of Rock Mechanics and Mining Sciences, 2021a, 138: 104548.
Xie, H., Liu, T., Gao, M., et al. Research on in-situ condition preserved coring and testing systems. Petroleum Science, 2021b, 18(6): 1840-1859.
Yang, D., Qi, X., Chen, W., et al. Numerical investigation on the coupled gas-solid behavior of coal using an improved anisotropic permeability model. Journal of Natural Gas Science and Engineering, 2016, 34: 226-235.
Yan, P., Lu, W., He, Y., et al. Coring damage mechanism of the Yan-tang group marble: combined effect of stress redistribution and rock structure. Bulletin of Engineering Geology and the Environment, 2016, 75: 1701-1716.
Zha, E., Zhang, Z., Zhang, R., et al. Long-term mechanical and acoustic emission characteristics of creep in deeply buried jinping marble considering excavation disturbance. International Journal of Rock Mechanics and Mining Sciences, 2021, 139: 104603.
Zhang, J., Hou, X., Zhou, G., et al. Quantifying and controller determination of shale matrix compressibility: Implications for pore structure and gas flow behavior analyses. Natural Resources Research, 2023, 32(5): 2095-2114.
Zhang, J., Xu, W., Wang, H., et al. A coupled elastoplastic damage model for brittle rocks and its application in modelling underground excavation. International Journal of Rock Mechanics and Mining Sciences, 2016, 84: 130-141.
Zhang, L., Huang, M., Xue, J., et al. Repetitive mining stress and pore pressure effects on permeability and pore pressure sensitivity of bituminous coal. Natural Resources Research, 2021, 30(6): 4457-4476.
Zhang, T., Yu, L., Su, H., et al. Experimental and numerical investigations on the tensile mechanical behavior of marbles containing dynamic damage. International Journal of Mining Science and Technology, 2022, 32(1): 89-102.
Zhao, X., Huang, B., Chen, B., et al. Experimental investiga tion of the effect of evenly distributed pore pressure on rock damage. Lithosphere, 2022, 2022: 1759146.
Zhao, Y., Bi, J., Zhou, X. Quantitative analysis of rockburst in the surrounding rock masses around deep tunnels. Engineering Geology, 2020, 273: 105669.
Zhou, S., Zhuang, X., Rabczuk, T. A phase-field modeling approach of fracture propagation in poroelastic media. Engineering Geology, 2018, 240: 189-203.
Zhou, X., Shen, F., Berto, F. Experimental study on triaxial creep behavior of red sandstone under different pore pressures based on ultrasonic measurement. Fatigue & Fracture of Engineering Materials & Structures, 2022, 45(8): 2388-2402.
Zhu, H., Liu, Q., Wong, G., et al. A pressure and temperature preservation system for gas-hydrate-bearing sediments sampler. Petroleum Science and Technology, 2013, 31(6): 652-662.
Zhu, W., Wei, C., Liu, J., et al. A model of coal-gas interaction under variable temperatures. International Journal of Coal Geology. 2011, 86(2-3): 213-221.
DOI: https://doi.org/10.46690/ager.2024.12.03
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