Experimental Investigation on Deformation of Natural Gas Hydrate in the Process of Decompressing

Abstract

The study of the mechanical properties of natural gas hydrate sediments is an important part in the research of gas hydrate extraction technology. However, in the past, most of the researches focused on triaxial compression experiments, and few people studied the deformation in the process of depressurization mining. In order to study this problem, we have simulated the relationship between the axial deformation of natural gas hydrate sediments and aerogenesis in the process of depressurization. In this experiment, the in-situ formation and decompression decomposition of hydrate are simulated, and the overlying pressure of 13.5MPa is loaded, and the axial deformation of hydrate sediment is recorded. The conclusion is that, in the process of hydrate decompression decomposing, the strain increased with the amount of gas produced, the relationship between strain value and gas production percentage is a proportional function, and the proportional coefficient increases with the increase of hydrate saturation.