【作者】 刘丽国；

【导师】 刘卫国； 赵佳飞；

【作者基本信息】 大连理工大学 ， 能源与环境工程， 2012， 硕士

【摘要】 本文通过在三维的天然气水合物实验平台上合成具有不同饱和度的天然气水合物,对沉积物中天然气水合物的多种开采方法进行了实验研究,主要内容包括：(1)通过控制不同的充气量合成了三种不同饱和度的水合物试样。结果发现,在相同充气量的多组水合物合成过程中,体系不同位置的温度曲线变化极为相似,说明水合物合成十分均匀；体系压力变化相似且最终的稳定压力十分接近,表明水合物合成的气体消耗量十分接近,因而相同充气量合成的水合物分布均匀且饱和度十分接近。(2)对三种不同饱和度的水合物进行了降压分解实验,结果发现,随着饱和度的提高,水合物吸热效应越发强烈,导致产气速率的波动越发剧烈,产气量随饱和度提高逐渐增大,因而对于高饱和度的水合物储藏可考虑辅助其他增强传热的方式,以更高效的开采水合物。(3)对三种不同饱和度的水合物进行了两循环式注热分解实验,结果表明,第一循环的产气量明显高于第二循环,随着饱和度的提高,第二循环的产气量有显著的提高,表明对于高饱和度的水合物储藏,采用两循环甚至多循环有着越发良好的效果。(4)对三种不同饱和度的水合物进行了降压与注热联合法分解实验,结果表明,联合法相比于单一降压法及注热法在产气速率及产气量方面均有明显的优势,且随着饱和度的提高,这种优势越发明显。更多还原

【Abstract】 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.更多还原