改进的计算气井井底压力的平均温度和平均压缩系数法

在利用平均温度和平均压缩系数法确定气井井底压力时，井筒平均温度和平均压缩系数的计算精度直接影响求取的井底压力准确性。根据静气柱法，得到长庆气田实测井底压力、温度的分布和地温常数与井口地面海拔的关系式，再利用输气管中稳定气流温度的计算方法来计算井筒平均温度。在用动气柱法求井底压力时，根据长庆气田井筒压力分布为线型，用线型代替抛物线型来计算井筒平均压力，然后用逐点迭代法求得较精确的井底压力。该方法提高了纯气井井底压力的计算精度。表２参４（陈志宏摘）

An improved method of average temperature and average compressibility factor for calculating bottom hole pressure of gas well.

The calculation accuracy of average wellbore temperature and compressibility factor method will directly affect the acuracy of bottom hole pressure (BHP). Based on the actual distribution data of BHP and temperature and formula of formation temperature constant and latitude measured in Changqing gas field, the average wellbore temperature was calculated by temperature determination method of stable gas flow in tube, and the average wellbore pressure was calculated by using linear wellbore pressure distribution instead of parabolic type distribution in dynamicgascolumn method, and BHP was determined by method of successive iteration and the calculating accuracy of BHP was increased by using the method developed in this paper.