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水合物地层变形是天然气水合物开采安全性评价的关键参数。提出了考虑传热、水合物分解相变、多相渗流和地层变形4个物理效应的一维多孔介质中水合物降压分解数学模型,在验证该模型适用性之后进行了粉细砂多孔介质变形敏感性分析。基于基本假设可以得到以下结论:出口压强是影响多孔介质变形的主要因素,出口压强越小,多孔介质最终变形越大,且完成变形所需时间越长。环境温度和多孔介质绝对渗透率对多孔介质最终变形没有影响,但会改变多孔介质完成变形所需时间的长度。
Hydrate formation deformation is a key parameter for evaluating the safety of natural gas hydrate production. A mathematic model of hydrate depressurization decomposition in one-dimensional porous media considering four physical effects of heat transfer, hydrate decomposition and phase transformation, multi-phase seepage and formation deformation is proposed. After verifying the applicability of the model, Deformation sensitivity analysis. Based on the basic assumptions, the following conclusions can be drawn: outlet pressure is the main factor affecting the deformation of porous media. The smaller the outlet pressure, the greater the final deformation of porous media and the longer it takes to complete the deformation. The ambient temperature and the absolute permeability of the porous media have no effect on the final deformation of the porous media but will change the length of time it takes for the porous media to complete the deformation.