Journal
FUEL
Volume 321, Issue -, Pages -Publisher
ELSEVIER SCI LTD
DOI: 10.1016/j.fuel.2022.124013
Keywords
Relative permeability; Gas hydrate; Porous media; Fluid distribution; LBM
Categories
Funding
- National Science Foundation for Distinguished Young Scholars of China [51625403]
- Major Scientific and Technological Projects of CNPC [ZD2019-184-002]
- China Postdoctoral Science Foundation [2021M701815]
- Postdoctoral Innovative Talents Support Program in Shandong Province [SDBX2021015]
- U.S. Department of En-ergy, Office of Fossil Energy, Office of Natural Gas and Petroleum Technology, through the National Energy Technology Laboratory [DE-AC02-05CH11231]
- Swiss National Science Foundation [175793]
- National Natural Science Foundation of China [41876051]
- Natural Science Foundation of China [52004319]
- Shandong Provincial Natural Science Foundation [ZR201910220407]
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The water-gas relative permeability in hydrate-bearing porous media is crucial for understanding multiphase flow characteristics. Experimental results reveal that increasing hydrate saturation reduces the effective permeability of water and gas. However, the effect of hydrate saturation on the water-gas relative permeability differs from its effect on the effective permeability.
The water-gas relative permeability is an important parameter to characterize multiphase flow in sediments. To study the water-gas relative permeability of hydrate-bearing porous media, multiphase flow simulations were carried out at the pore scale using the lattice Boltzmann method. The effects of hydrate saturation and hydrategrowth habits on the water-gas relative permeability, which is scaled by the relative permeability considering the hydrate only, were evaluated in a two-dimensional porous medium. Results show that the increase of hydrate saturation causes the decrease of water-gas effective permeability as expected. However, the effect of hydrate saturation on the water-gas relative permeability is different from that of hydrate saturation on the water-gas effective permeability. The water-gas relative permeability increases with the increase of hydrate saturation in the pore-filling case. The water-gas relative permeability decreases with the increase of hydrate saturation in the grain-coating case. The wettability of solid phase has a different effect on the relative permeability of wetting phase and nonwetting phase. The Jamin effect (phase blocking) was observed and may exist in the production of gas from natural gas hydrate reservoirs. This seriously affects the multiphase flow characteristics. The changes of microscale fluid distribution effect the changes of water-gas relative permeability. The relationship between the water-gas relative permeability and the characterization parameters of microscale fluid distribution was analyzed.
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