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Experimental Study on Two-phase Flow in Artificial Hydrate-bearing Sediments
Ahn, Taewoong,Lee, Jaehyoung,Huh, Dae-Gee,Kang, Joe Myoung 한국암반공학회 2005 Geosystem engineering Vol.8 No.4
It is important to investigate gas-water multiphase flow in methane hydrate-bearing sediment. In this work, we measured relative permeability of gas and water in artificial methane hydrate bearing sediment by the unsteady state method, and determined the effects of hydrate saturation on relative permeability curves. The results show that the relative permeability shifted left with increasing hydrate saturation.
Effects of Absolute Permeability on the Fractal Characteristics of the Artificially Fractured Cores
Kim, Hyun Tae,Huh, Dae Gee,Kim, Se Joon,Sung, Won Mo 한국암반공학회 2004 Geosystem engineering Vol.7 No.2
The purpose of this study is to grasp the relationship between the absolute permeability and fractal dimension of fracture system examined by experimental approach. For this purpose, we prepared eight types of artificially fractured system and measured absolute permeability by pressure pulse decay method, and calculated fractal dimension by box counting method. The correlation function between absolute permeability and fractal dimension is $K=2.3386D^{2.6436}$. The fractal dimension range of its application is lower than 1.5. The equation can be used as the permeability estimation with fractal dimension appeared on cross section which is perpendicular to direction of fluid flow, even if this equation has limits on using artificially fractured cores.
Development and Application of Gas Hydrate Reservoir Simulator Based on Depressurizing Mechanism
Sung,Won Mo,Huh,Dae Gee,Ryu,Byong Jae,Lee,Ho Seob 한국화학공학회 2000 Korean Chemical Engineering Research(HWAHAK KONGHA Vol.38 No.3
Natural gas hydrates are known to occur in vast quantities at the ocean floor or in permafrost regions. In-situ hydrate contains great volumes of methane gas, which indicates a potential future energy resource. In this study, we have developed a three-dimensional, multi-phase (gas, water, and hydrate) flow finite-difference model by using implicit pressure explicit saturation technique in order to investigate simultaneous flow through ice-liked hydrate reservoir. The developed model is based on the depressurizing method as producing mechanism. The model evaluates local gas generation dissociated from the hydrate with the aid of kinetic dissociation theory proposed by Kim-Bishnoi. The computation of kinetic dissociation uses the empirical dissociation rate as a function of specific surface area between phases and pressure difference. With the developed model, a one-dimensional system has been simulated for analyzing the production performance of a hydrate reservoir and For investigating the effect of hydrate saturation on absolute permeability and relative permeability characteristics. Also, for the three-dimensional field-scaled reservoir system, a number of numerical exercises have been conducted to understand the effect of mass transfer and to characterize the flowing mechanism under the conditions of increased permeability resulting from the dissociation hydrate.