Mesoscale modeling on the influence of surfactants on seepage law during water injection in coal  

作　　者：Yanan Miao Haoran Li Mingzhu Zhu Chaojie Zhao Tengwen Zhang Hussein Mohammed Ahmed Kaid 

机构地区：[1]College of Safety and Environmental Engineering,Shandong University of Science and Technology,Qingdao,266590,China [2]State Key Laboratory of Mining Disaster Prevention and Control Co-Founded By Shandong Province and the Ministry of Science and Technology,Shandong University of Science and Technology,Qingdao,266590,China [3]Sinopec Research Institute of Safety Engineering Co.,Ltd.,Qingdao,266000,China [4]State Key Laboratory of Safety and Control for Chemicals,SINOPEC Research Institute of Safety Engineering Co.,Ltd.,Qingdao,266000,China [5]College of Mechanical and Electronic Engineering,Shandong University of Science and Technology,Qingdao,266590,China

出　　处：《Particuology》2025年第1期1-13,共13页颗粒学报(英文版)

基　　金：support of National Natural Science Foundation of China(grant Nos.52104208 and 52304017);Natural Science Foundation of Shandong Province(grant No.ZR2020QE123).

摘　　要：To investigate the mesoscopic influence of surfactants on seepage law during water injection in coal seam, this paper innovatively establishes a fluid transport lattice Boltzmann (LBM) model by incorporating the seepage resistance generated from the porous media and external forces, which embodies the impact of wettability degree resulted from cocamidopropyl betaine (CAB), sodium dodecyl sulfate (SDS), and coconutt diethanol amide (CDEA) reagents at a 0.1% concentration. The main conclusions derived from this investigation are as follows: Firstly, as the lattice number in the X direction increases, the average seepage velocities in coal samples treated by deionized water, 0.1% CAB, 0.1% SDS, and 0.1% CDEA reagents (Nos. 1, 2, 3, and 4) exhibit three distinct stages: rapid decline, slow decline, and steady decline;in comparison to raw coal sample, modified coal samples demonstrate decreases of 20.84%, 33.91%, and 61.70%, respectively. Secondly, the critical values of displacement pressure difference exist during the phenomenon that modified reagents spread out in the entire flow channel, which are 3.5, 3.5, and 5.2 MPa, respectively, for coal samples Nos. 2, 3, and 4;this signifies that surpassing these critical values help prevent issues such as blank belts within the wetting range and insufficient dust control. Finally, at a displacement pressure difference of 0.01 (lattice unit), the average velocity ratios for samples (Nos. 2, 3, and 4) are 0.78, 0.56, and 0.37 (lattice unit), respectively;notably, the water flow velocities in modified coal samples are lower compared to that in raw coal sample, indicating that the addition of surfactants impede the seepage process of water injection in coal seam. Moreover, when the displacement pressure difference reaches 0.03 (lattice unit), the velocity ratio of CDEA-modified coal sample exceeds 100%;this means that when the displacement pressure difference surpasses 15.6 MPa, the water injection effect of CDEA-modified coal sample begins to be improved. These research findi

关 键 词：Mesoscale seepage SURFACTANT Lattice Boltzmann method Velocity ratio Critical displacement pressure difference 

分 类 号：TD745[矿业工程—矿井通风与安全]