高气液比气井井筒温度分布计算方法

井筒的温度分布是气井设计和动态分析必不可少的参数，可以通过直接测量或者计算两种方法得到。但是目前对于一些超深、高温高压或井况复杂的气井，难以进行直接测量；对于高气液比气井，井筒温度分布的计算方法存在计算精度低和可用性问题。因此，研究井筒内的温度分布十分必要。以传热学和两相流理论为基础，建立了高气液比气井井筒温度分布的计算模型，考虑到液相对热物性参数的影响，可以在没有井口资料的情况下计算出气井井筒内的温度分布；对井口温度的敏感性进行了分析，分析了气产量、液产量、不同液体以及管径等对井口温度的影响；通过实例计算，井口温度的计算平均误差为2.35％，与不考虑液相影响的计算结果相比较，该结果更与实测值接近，更为精确。

CALCULATING METHOD OF BOREHOLE TEMPERATURE DISTRIBUTION FOR GAS WELLS WITH HIGH GAS/LIQUID RATIO

The borehole temperature distribution is the necessary parameter for design and performance analysis of gas wells, which can be obtained by direct measurement or calculation. But, it is difficult for the super-deep wells, the gas wells with high temperature and pressure and the gas wells with complicated state to measure directly. As for the gas wells with high gas/liquid ratio, the calculating method of borehole temperature distribution has low accuracy and feasibility. So, it is necessary to study the borehole temperature distribution. Based on the heat transferring principle and the bi-phase flow theory, the calculating model of borehole temperature distribution for the gas wells with high gas/liquid ratio is established. According to the influence of liquid phase on the thermal parameters, the borehole temperature distribution of the gas well can be calculated even without the well-head data. The sensitivity of well-head temperature is investigated. The influence of gas production, liquid production, different liquids and tubing diameter on the well-head temperature is analyzed. With real case calculating, the calculating average error of well-head temperature is 2.35%. Comparing with the results without considering the influence of liquid phase, the calculating results are more fitting to the values of real measurement and more accurate.