首页|Pore-scale modeling of pore structure properties and wettability effect on permeability of low-rank coal

Pore-scale modeling of pore structure properties and wettability effect on permeability of low-rank coal

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Permeability is a key parameter for coalbed methane development.Although the absolute permeability of coal has been extensively studied,wettability and pore structure properties continue to challenge the microscopic description of water-gas flow in coal.For this purpose,we reconstructed the microstructures of low-rank coal using micro-computed tomography(micro-CT)images.Pore geometry and pore-throat parameters are introduced to establish a relationship with absolute permeability.A dual-porosity pore network model is developed to study water-gas displacement under different wetting and pore structure properties.Results show that absolute permeability is significantly affected by pore geometry and can be described using a binary quadratic function of porosity and fractal dimension.Water-gas relative perme-ability varies significantly and the residual gas saturation is lower;the crossover saturation first decreased and then increased with increasing porosity under hydrophobic conditions.While the water relative permeability is lower and a certain amount of gas is trapped in complex pore-throat networks;the crossover saturation is higher under hydrophilic conditions.Models with large percolating porosity and well-developed pore networks have high displacement efficiency due to low capillary resistance and avoidance of trapping.This work provides a systematic description of absolute permeability and water-gas relative permeability in coal microstructure for enhanced gas recovery.

Micro-CTPermeabilityWetting conditionPore structure propertiesWater-gas flow

Xiangjie Qin、Jianchao Cai、Gang Wang

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State Key Laboratory of Petroleum Resources and Prospecting,China University of Petroleum,Beijing 102249,China

State Key Laboratory of Mining Disaster Prevention and Control Cofounded by Shandong Province and the Ministry of Science and Technology,Shandong University of Science and Technology,Qingdao 266590,China

National Natural Science Foundation of ChinaNational Natural Science Foundation of ChinaNatural Science Foundation for Distinguished Young Scholars of Shandong ProvinceYouth Science and Technology Innovation of Shandong ProvinceSpecial Funds for Taishan Scholar Project

5193400451974176ZR2020JQ222019KJH006TS20190935

2023

矿业科学技术学报(英文版)
中国矿业大学

矿业科学技术学报(英文版)

CSTPCDCSCD北大核心EI
影响因子：1.222
ISSN：2095-2686
年,卷(期)：2023.33(5)
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