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http://dx.doi.org/10.7474/TUS.2014.24.2.143

Geomechanical Model Analysis for the Evaluation of Mechanical Stability of Unconsolidated Sediments during Gas Hydrate Development and Production  

Kim, Hyung-Mok (Energy & Mineral Resources Engineering, Sejong University)
Rutqvist, Jonny (Lawrence Berkeley National Laboratory)
Publication Information
Tunnel and Underground Space / v.24, no.2, 2014 , pp. 143-154 More about this Journal
Abstract
In this study, we simulated both dissociation of gas hydrate and mechanical deformation of hydrate-bearing sedimentary formation using geomechanical model. The geomechanical model analysis consists of two distinct codes of TOUGH+Hydrate and FLAC3D. The model is characterized by the fact that changes of temperature, pressure, saturation and their influence on the consequent evolution of effective stress, stiffness and strength of hydrate-bearing sediments during gas production could be well simulated. We compared the results of simulation for two different production methods, and showed that combination of depressurization and thermal stimulation results in the enhancement of production rate especially at early stage. We also presented that the hydrate dissociation-induced geomechanical deformation in unconsolidated clay is much larger than that in sandstone.
Keywords
Gas hydrate; Dissociation; Geomechanical model; Depressurization; Thermal stimulation; TOUGH+Hydrate; FLAC3D;
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Times Cited By KSCI : 5  (Citation Analysis)
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