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为了研究温度和压力对置换开采的影响规律,分析了CO2置换法开采天然气水合物的实验原理及微观过程。采用对比实验的方法,通过自行设计的水合物生成与置换装置,研究了温度、压力等热力学因素对置换速率及置换效率的影响。实验温度设定为274.15 K、276.15 K、278.15 K,实验压力设定为3.5 MPa、3.85 MPa、4.0 MPa。实验结果表明:置换温度与置换压力均对置换效果有重要影响,其中温度对置换结果产生的影响要大于压力对置换结果产生的影响。在一定实验条件下,置换温度和置换压力越高,置换速率越大,置换效果越好。该实验结果可为水合物藏的商业开采提供技术指导,促进置换法开采的工程应用。
In order to study the effect of temperature and pressure on displacement, the experimental principle and microscopic process of gas hydrate by CO2 displacement method were analyzed. The effects of thermodynamic factors such as temperature and pressure on displacement rate and displacement efficiency were studied by means of comparative experiments using hydrate formation and displacement devices designed by ourselves. Experimental temperatures were set at 274.15 K, 276.15 K, 278.15 K, and experimental pressures were set at 3.5 MPa, 3.85 MPa, 4.0 MPa. The experimental results show that both the displacement temperature and the displacement pressure have an important influence on the displacement effect, and the effect of temperature on the displacement result is greater than that of the pressure displacement effect. Under certain experimental conditions, the higher the displacement temperature and displacement pressure, the larger the displacement rate and the better the displacement effect. The experimental results can provide technical guidance for the commercial exploitation of hydrate reservoir and promote the engineering application of displacement method.