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化工学报  2014 

石英砂中甲烷溶解运移体系水合物生成与聚集实验分析

DOI: 10.3969/j.issn.0438-1157.2014.02.046, PP. 692-700

Keywords: 甲烷,水合物,石英砂,溶解,电阻率,聚集

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Abstract:

建立了可模拟海底天然气水合物形成环境的大型三维成藏实验模拟装置,其主体高压反应釜内径500mm,高1000mm。在此基础上,采用填砂模型,进行了甲烷溶解运移体系下甲烷水合物生成与聚集过程的实验模拟分析。实验流程为:甲烷溶解于NaCl溶液中,再泵送进入高压反应釜,在沉积层中渗流并生成甲烷水合物。通过30个电阻率传感器监测甲烷水合物的生成和聚集过程。实验结果表明,甲烷溶解运移体系下甲烷水合物生成之后首先分散在溶液中,当溶液的总甲烷浓度(溶解的甲烷及水合物分散相中的甲烷)达到操作条件下盐溶液体系甲烷饱和溶解度后,甲烷水合物从溶液中析出。电阻率分布实验结果表明,析出甲烷水合物的聚集区域受溶液流动控制。

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