ABSTRACT
Hydrate production may induce subsea geological or engineering hazards. Achieving commercial production of hydrates requires long-term stratum stability. Lab test results of the sediment during hydrate decomposition are important parameters for evaluating the stratum stability. The parameters variation of silty fine sand related to the hydrate decomposition process was measured and analyzed using NMR and triaxial apparatus. The results show that the hydrates preferentially decompose in hydrate and particle interface or small pores. When decomposing at room temperature, the hydrate saturation and decomposition time show a linear relationship. Additionally, the modified Duncan Chang constitutive model can well describe the variation of mechanical properties of hydrate sediments.
