H型天然气水合物形成实验

大分子烃在小分子烃类气体（如甲烷、乙烷）的帮助下可形成H型天然气水合物。为此，分别进行了该型天然气水合物形成条件和形成过程实验研究。前者表明，在甲烷水合物实验体系中加入甲基环己烷，则形成的天然气水合物结构会由Ⅰ型转变为H型，水合物的形成压力降低1.0 MPa以上。后者表明，甲基环己烷可提高甲烷水合物反应体系中水合物的形成速度，但减少了水合物的生长时间和甲烷气体耗量；含甲基环己烷体系水合物的耗气量随压力的增大而增大，但随着甲基环己烷含量的增大则水合物的形成速度和耗气量逐渐减少。

EXPERIMENTAL STUDY ON THE FORMATION OF STRUCTURE H HYDRATE

Big molecular hydrocarbons can be turned into structure H hydrate by the help of small molecular hydrocarbons like methane, ethane, etc. Therefore, this study carried out lab tests on condition and process respectively for the formation of structure H hydrate. The formation condition test showed that the methane hydrate was added methylcyclohexane (MCH), structure I hydrate would be turned into structure H, and its formation pressure would be reduced as low as more than 1.0 MPa. The formation process test showed that MCH could help increase the speed of forming hydrate in the reaction system of methane hydrate, while shortening the time of hydrate growth and cutting down the consumption of methane gas. Comparing hydrate formation in methane and in methane + MCH, this study discovered that the former hydrate formation speed and the consumption of methane gas would increase with the rising pressure; whereas the latter hydrate speed and the consumption of gas would decrease gradually with the increasing content of MCH.