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建立冬季结冰期封井系统耦合热力过程的物理模型;通过采用广义中点积分法则,给出时间离散化的耦合系统热传导方程;提出适应于该热力偶合热传导问题的变分原理和有限元计算列式;讨论了与冰晶体压力相关的相变温度变化对空间离散系统数值积分和应力计算的影响.采用该耦合热力模型对辽河油田封井井口的耦合冻胀问题进行计算.
The physical model of coupled thermodynamic process during the winter icing period was established. By using the generalized midpoint integral rule, the time-discretized coupled system heat conduction equation was given. The variational principle and finite element method The influence of the change of phase transition temperature related to ice crystal pressure on the numerical integration and stress calculation of discrete space system is discussed.The coupled frost heaving problem of wellhead in Liaohe Oilfield is calculated by using the coupled thermodynamic model.