��������Ͳѹ���¶ȷ���������ʶ

章提出气井在井筒流动的稳定性应分为质量稳定和热力稳定的问题。综合二维径向多阶段不稳定热扩散分析解，和垂直井(斜井)管流质量守恒、动量守恒、能量守恒、状态方程，给出了预测井筒流动、地层热扩做双重不稳定规律的数学模型和数值解法。以新疆柯克亚气田柯深1井进行了实例分析，发现传统的考虑井筒稳定流动方法计算结果，由于忽略了井筒中的热力不稳定变化过程，压力和温度明显高于本方法的计算结果。以本方法对比计算不同产气量的情况，结果符合一般认识。由于岩石热扩散系数很小，气井工作制度的变化会引起气井长期的热力不稳定，对于气井井筒不稳定动态的模拟在气井产能评价、动态分析等方面具有重要的意义。

New Idea for Borehole Pressure and Temperature Analysis of Gas Wells

The article points out the gas flow stability in the borehole should be divided into quality stability and thermal stability.Integrating the analysis solution of unsteady thermo diffusion of 2 D radial multi stages with quality conservation,momentum conservation,energy conservation,and state equation of vertical (or deviated) well conductor flow,the article provides the mathematical model and numeral solution of dual unsteady law to predict borehole flow and formation thermo diffusion.Taking well Keshen 1 in Kekeya gas field,Xinjiang as a real example,it is found that the pressure and temperature calculated by the traditional method,considering borehole stationary flow,is obviously higher than that calculated by above mentioned method because the traditional method omits the thermal unsteady variation in the borehole.The results calculated by the above mentioned method under different gas productions couple with the real situation.Since the thermo diffusion coefficient of rocks is small,the working system changing of gas wells will cause long thermal instability of the wells.The dynamic modeling of borehole instability is very useful to the productivity evaluation,performance analysis of gas wells,and so on.