考虑实际界面张力的凝析气井临界携液流量计算方法

 为提高凝析气井井筒积液状态判断的准确率，通过对凝析气藏气液界面张力和气井携液常规模型的分析，研究了考虑实际界面张力的气井临界携液流量计算方法。根据气井井筒的温度及压力计算出实际界面张力，通过引入实际界面张力对常规模型进行修正，得到考虑实际界面张力的气井临界携液流量计算模型；在实际计算时将产油气井和油水同产气井区分对待，产油气井以油气界面张力计算，油水同产气井以气水界面张力计算。应用修正的3 种常规模型分别对新疆某凝析气田20 口气井的临界携液流量进行计算比较，表明修正Turner 模型计算结果对井筒积液判断的准确率达到90%，可作为该区域气井积液的判断标准。

Calculation Method of Critical Flow Rate in Condensate Gas Wells Considering Real Interfacial Tension

Through study of gas-liquid interfacial tension of condensate gas reservoir and conventional gas well continuousremoval liquid model, this paper proposes a calculation method of critical flow rate in condensate gas wells with real interfacial tension to improve the accuracy of judgment of gas well liquid loading status used by conventional models. Analysis of the changing characteristics of interfacial tension shows that condensate oil has low interfacial tension. When condensate gas well liquid loading is analyzed, wells are suggested to be divided into two types: oil-gas wells and oil-water wells. Oil-gas interfacial tension was used in calculation for oil-gas wells, while gas-water interface tension was used in calculation for oil-water wells. According to the well production state, the actual temperature and pressure were used to calculate the interfacial tension. Three general models were modified by considering the variable interfacial tension, and the critical flow rates were calculated for 20 gas wells of a condensate gas field in Xinjiang. The results show that the accuracy rate of critical flow rate calculated by the modified Turner's model reached 90%, which can be used as the judging standard of prediction of liquid loading in this region.