Experimental Investigation on Controlling the Depressurization-Induced Production Behavior from Hydrate-Bearing Sediments in 10-Meter-Scale

摘要

The depressurization-induced production behavior of 10-meter-scalernhydrate-bearing sediments was experimentally investigated to explorernthe possibility of controlling the gas production behavior by adjustingrnpressure conditions. A 10-meter-scale apparatus was constructed tornsimulate the hydrate dissociation under depressurization. Anrnunconsolidated sedimentary sample was prepared using artificialrnparticles with a similar grain-size distribution of sandy layers to that inrnreal hydrate fields. In the experiments, pressure, temperature, and gasrnproduction volume were measured. The results showed that the gasrnproduction behavior was dominated by the fluid flow and was stronglyrnaffected by the rate of depressurization, which contrasts with previousrnexperimental results.