Abstract

Viscoelastic behaviors of gas-hydrate-bearing sediment are thought to be significant in the long-term prediction of the geomechanical response to gas extraction from the gas-hydrate reservoir. Two types of triaxial compression tests on artificial methane-hydrate-bearing sediment samples were conducted: constant-strain-rate test and creep test. The samples were formed by Toyoura sand and No.8 sand. The grain size distribution of No.8 sand is wider than that of Toyoura sand. It was clarified that the viscoelasticity of hydrate-No.8-sand specimen were stronger than that of hydrate-Toyoura sand in the early stage of axial loading due to its wider grain size distribution.

Keywords:
sand grain size dependence, flow assurance, methane hydrate, triaxial compression test, strain-rate dependence, sand specimen, constant-strain-rate test, axial loading, size distribution, early stage
Subjects:
Flow Assurance, Reservoir Characterization, Non-Traditional Resources, Hydrates, Gas hydrates
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2014. International Society of Offshore and Polar Engineers
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