多孔介质下水合物形成实验研究

Experimental research on hydrate formation in porous media

为了研究在石英砂和粉末状碳酸钙体系下天然气水合物的形成情况,利用KDSD-Ⅲ型水合物生成实验装置在初始压力6 MPa、温度275.15 K条件下,研究了2种体系下天然气水合物的形成问题。结果表明:对于石英砂体系,石英砂粒径越大,水合物储气密度越高;对于粉末状碳酸钙体系,相比于纯水溶液,水合物形成速率较快,但是水合物储量和储气密度明显降低。同时,对石英砂体系和粉末状碳酸钙体系下的耗气量和储气密度做了比较,发现石英砂体系下的气体消耗量和储气密度均比粉末状碳酸钙体系下的小。最后,在石英砂体系下,水合物形成诱导期和碳酸钙对水合物形成的影响做了机理分析。

In order to study the formation of natural gas hydrate in the quartz sand and powdered calcium carbonate system,the formation of natural gas hydrate in the two systems was studied by the KDSD-Ⅲhydrate formation experimental device under the conditions of an initial pressure of 6 MPa and 275.15 K.The results show that for the quartz sand system,the larger the particle size of the quartz sand,the higher the hydrate gas storage density;for powdered calcium carbonate system,hydrate formation rate is faster than that of pure aqueous solution,but the hydrate storage and gas storage density are significantly reduced.At the same time,the gas consumption and gas storage density of the quartz sand system and the powdered calcium carbonate system were compared,and it was found that the gas consumption and gas storage density of the quartz sand system were lower than those of the powdered calcium carbonate system.Finally,the induction period of hydrate formation and the influence of calcium carbonate on the formation of hydrate in the quartz sand system were analyzed.