Abstract
A constitutive model for marine sediments containing natural gas hydrate is essential for the simulation of the geomechanical response to gas extraction from a gas-hydrate reservoir. In this study, the triaxial compressive properties of artificial methane-hydrate-bearing sediment samples reported in an earlier work were analyzed to examine the applicability of a nonlinear elastic constitutive model based on the Duncan-Chang model. The presented model considered the dependences of the mechanical properties on methane hydrate saturation and effective confining pressure. Some parameters were decided depending on the type of sand forming a specimen. The behaviors of lateral strain versus axial strain were also formulated as a function of effective confining pressure. The constitutive model presented in this study will provide a basis for an elastic analysis of the geomechanical behaviors of the gas-hydrate reservoir in the future study, although it is currently available to a limited extent.
Highlights
Natural gas hydrates are anticipated to be a promising energy resource [1,2,3,4]
The mechanical property of a gas hydrate reservoir is considered to be essential for sustainable production, because it will affect the stability of a wellbore or other subsea structures, the occurrence of geohazards and gas productivity [5,6,7,8]
An elastic constitutive model may be practically useful for the preliminary simulation of the mechanical behavior of a reservoir on the condition that we use it with particular attention to the applicable range
Summary
Natural gas hydrates are anticipated to be a promising energy resource [1,2,3,4]. The mechanical property of a gas hydrate reservoir is considered to be essential for sustainable production, because it will affect the stability of a wellbore or other subsea structures, the occurrence of geohazards and gas productivity [5,6,7,8].A constitutive model for gas-hydrate-bearing sediments is required for the simulation of the geomechanical response to gas extraction from a gas-hydrate reservoir. Laboratory studies are useful for constructing a constitutive model for gas-hydrate-bearing sediments. Few constitutive model for gas-hydrate-bearing sediments has been published [9], there have been reports on laboratory studies concerning the triaxial compressive properties of natural and artificial gas-hydrate-bearing sediment samples [10,11,12,13,14,15,16,17,18,19]. The application of the Duncan-Chang model, a nonlinear elastic model, to the analysis of the triaxial compressive properties of artificial methane-hydrate-bearing sediment samples reported mainly in an earlier work [19] was examined. The dependences of the mechanical properties on methane hydrate saturation and effective confining pressure were considered
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