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Study of multiphase flow laws in sediment with gas hydrate based on LBM method
YU Xi chong1, LIU Yu2, SONG Yong chen2, LI Qing ping1, PANG Wei xin1, BAI Yu hu1
(1.Deepwater Engineering Key Laboratory, CNOOC Research Center, Beijing 100027, China;2.School of Energy and Power Engineering, Dalian University of Technology,Dalian 116024, China)
Abstract:
According to the fluid migration and pore medium characteristics during decomposition process of gas hydrate in sediments, the lattice Boltzmann method (LBM) used in multiphase flow law study in sediments with natural gas hydrate was proposed. The method is for the mesoscopic model between the macro and micro. The effects of saturation change on characteristics of hydrate permeability were studied using lattice Boltzmann model for hydrate formation and decomposition process in porous media. The results show that flow field distribution of single phase flow in porous media is related to the pore diameter (saturation) and permeability. The permeability of porous media decreases greatly due to hydrate formation in sediment.
Key words:  LBM method  gas hydrate  sediment  multiphase flow