为验证Ar促进CO2置换CH4水合物实验方案的可行性，在自行设计的实验台上开展了可行性实验。通过设置不同的Ar/CO2的混合比例对照实验，研究在相同置换温度、压力条件下，充入不同Ar含量对置换过程中不同时刻CH4置换量、Ar和CO2的残余量及置换率的影响规律。置换实验的压力为3.5 MPa，温度为278.15 K，置换气体分别为纯CO2、Ar和CO2的混合气（混合比为1∶〖KG-2mm〗3、1∶〖KG-2mm〗4、1∶〖KG-2mm〗9）。实验研究表明：纯CO2置换CH4的置换率仅为46%，混合比为1∶〖KG-2mm〗3、1∶〖KG-2mm〗4、1∶〖KG-2mm〗9的混合气置换率分别为21%、63%和66%，所以Ar作为小分子气体添加剂促进了CO2置换CH4水合物，提高了CH4的置换率；随着充入Ar比率的增大，不同时刻CH4的置换量及置换率均有所提高，Ar和CO2的残余量有所减少；在置换反应的初始阶段CH4的置换率增长较快，在置换反应中后期，CH4的置换率变化平缓。

In order to verify the feasibility of adding Ar to promote the replacement rate of CH4 hydrate with CO2,a feasibility experiment was carried out on a selfdesigned test bench.With different mixing ratios of Ar/CO2,the influence of different Ar content on the replacement rate,CH4 replacement，residual amount of Ar and CO2 at different times during the replacement process was studied under the same replacement temperature and pressure.The displacement test pressure is 3.5 MPa and the temperature is 278.15 K.The replacement gas was pure CO2,and the mixtures of CO2 and Ar (mixing ratio is 1∶〖KG-2mm〗3,1∶〖KG-2mm〗4,1∶〖KG-2mm〗9).Experimental research showed：the replacement rate of pure CO2 for CH4 was only 4.6%,while those for The CO2-Ar mixing ratios of 1∶〖KG-2mm〗3,1∶〖KG-2mm〗4 and 1∶〖KG-2mm〗9 were 21%,63% and 66%,respectively.Ar as a small molecular gas additive promoted CO2 replacement of CH4 hydrate and improved the replacement rate of CH4.With the increase of Ar content,the replacement rate of CH4 was increased,Ar and CO2 residues were decreased at different time.In the initial stage of the replacement reaction,the replacement rate of CH4 was increased rapidly.In the middle and late stages of the replacement reaction,the change of the replacement rate of CH4 was slow.

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国家自然科学基金（51976131，51676131）；国际（地区）合作与交流项目（51811530315）；上海“科技创新行动计划”地方院校能力建设项目（19060502200）