Experiment Study Of Different Saturated Methane Hydrates Exploitation

In this dissertation, some of gas hydrates exploitation method in sediments are studied experimentally by through different saturated hydrates are formed on the platform of three-dimensional hydrates experiments. The research contents are as follows:(1) Three different saturated hydrates are formed by controlling amount of gas. The results indicated that in the series of hydrates formation, the temperature profiles of every RTD in the vessel are likely similar, so, the hydrates are formed well-distributed; the system pressure profiles are also similar and the eventually pressure are very closely, the consumption of gas are closely, so the amount of hydrates formation and the saturation are also closely.(2) Three different saturated hydrates are dissociated by depressurization, the results indicated that as the saturation increasing, the endothermic effect of hydrates dissociation stronger, the fluctuation of gas production rate intensifying, and the amount of gas production increasing. So, for the higher saturated hydrates, some of auxiliary heat transfer measures would be advisable in depressurization method.(3) Three different saturated hydrates are dissociated by two circle warm water flooding. The results indicated that the amounts of the first circle are obviously higher than of the second circle. As the saturation increasing, the amount of the second circle is markedly enhancing, so, for the higher saturated hydrates, two or more circle would be advisable in the warm water flooding method.(4) Three different saturated hydrates are dissociated by combination of depressurization and warm water flooding. The results indicated that the combination method has many obvious advantages in the hydrates exploitation compared with depressurization or warm water flooding method. And as the saturation increasing, those advantages are clearer.