The effects of compressibility of natural gas hydrate-bearing sediments on gas production using depressurization

Natural gas hydrate is a new alternative energy that has attracted global attention in recent years. Depressurization is considered a fundamental method of producing natural gas from gas hydrate-bearing sediments (GHBSs). However, soil compaction during depressurization is a significant problem for...

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Vydáno v:Energy (Oxford) Ročník 185; s. 837 - 846
Hlavní autoři: Sun, Xiang, Li, Yanghui, Liu, Yu, Song, Yongchen
Médium: Journal Article
Jazyk:angličtina
Vydáno: Oxford Elsevier Ltd 15.10.2019
Elsevier BV
Témata:
Alternative energy sources
Bearing
Bulk modulus
Compressibility
Compressibility effects
Computational fluid dynamics
Computer simulation
Conductivity
Convection
Depressurization
dissociation
Fluid flow
gas hydrate
Gas hydrates
Gas production
Heat conductivity
Heat transfer
Hydrate dissociation
Membrane permeability
Natural gas
Oil and gas production
Permeability
Pore pressure
Pore water pressure
Porosity
Pressure
Pressure reduction
Production methods
renewable energy sources
Sediments
soil
Soil compaction
Soil compressibility
Soil mechanics
Soil permeability
Soil porosity
Soils
temperature
Thermal conductivity
Gas production
Hydrate dissociation
Compressibility
Depressurization
ISSN:0360-5442, 1873-6785
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Shrnutí:Natural gas hydrate is a new alternative energy that has attracted global attention in recent years. Depressurization is considered a fundamental method of producing natural gas from gas hydrate-bearing sediments (GHBSs). However, soil compaction during depressurization is a significant problem for production efficiency and safety. The compressibility of soil affects the hydrate dissociation in the coupled process of heat transfer, fluid flow, and soil compaction. In this study, a fully coupled Thermo-hydro-chemo-mechanical (THCM) model is applied to simulate Masuda's core-scale gas production experiments. The effects of compressibility on the changes in gas production rate, pore pressure, temperature, hydrate saturation, permeability, and heat conductivity are investigated by varying the parameters governing compressibility including the bulk modulus of host sediments and hydrate-enhanced bulk modulus. The results show that the higher compressibility corresponds to a larger reduction in porosity further impacting the variation in effective permeability, heat conductivity, and heat convection during depressurization. In Masuda's test, the pressure changes indicate that the soil compaction might occurs during depressurization. Because the real field production is implemented under confining condition, Masuda's test should be developed to consider the compressibility of GHBSs. •Soil compaction indirectly affects heat transfer by decreasing the porosity.•The compressibility of host sediment affects gas production more than the enhanced compressibility by hydrate.•The effective permeability is modified to consider both soil compaction and hydrate dissociation.•Soil compaction may happen in Masuda's core-scale experiment.
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ISSN:0360-5442
1873-6785
DOI:10.1016/j.energy.2019.07.108