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| Displacement of tight sandstone based on lattice Boltzmann method |
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TANG Mingming1, LU Shuangfang1, XIN Ying 2, TAN Hongkun1, LIU Xueping1, SHI Xian3, ZHANG Hongliang4
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(1.Key Laboratory of Deep Oil and Gas in China University of Petroleum (East China), Qingdao 266580, China;2.China National Oil and Gas Exploration and Development Company Limited, Beijing 100621, China;3.School of Petroleum Engineering in China University of Petroleum(East China), Qingdao 266580, China;4.Daqing Oilfield Limited No.9 Oil Production Company, PetroChina, Daqing 163853, China)
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| Abstract: |
| A series of simulation studies are carried out based on three-dimensional digital modelling method and lattice Boltzmann simulation method to investigate the micro processes and mechanism of water flooding in tight sandstone. In this paper, a three-dimensional digital rock model is constructed based on the high-resolution CT scan data of tight sandstone sample from Longhupao area in Daqing Oilfield. Then a series of numerical simulations are carried out based on lattice Boltzmann method (LBM) to analysis the micro displacement process of water flooding in tight sandstone with different injecting conditions. The results show that displacement efficiency is higher for water flooding with higher injection velocity or injection pressure difference when the total injection water volume is the same.There is an optimal value for the injection velocity and injection pressure difference for water flooding in tight sandstone. The average ultimate displacement efficiency of water flooding with a constant injection velocity is 49.6％, while the average ultimate displacement efficiency of water flooding with a constant injection pressure difference is 47.3％. |
| Key words: tight sandstone lattice Boltzmann method (LBM) constant pressure displacement constant velocity displacement digital rock |
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