ABSTRACT

The depressurization-induced production behavior of 10-meter-scale hydrate-bearing sediments was experimentally investigated to explore the possibility of controlling the gas production behavior by adjusting pressure conditions. A 10-meter-scale apparatus was constructed to simulate the hydrate dissociation under depressurization. An unconsolidated sedimentary sample was prepared using artificial particles with a similar grain-size distribution of sandy layers to that in real hydrate fields. In the experiments, pressure, temperature, and gas production volume were measured. The results showed that the gas production behavior was dominated by the fluid flow and was strongly affected by the rate of depressurization, which contrasts with previous experimental results.

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