关键词: 节点分析, 相态, 渗流, 垂直管流, 凝析气井, 生产系统

Abstract: Based on the flow characteristics of gas and retrograde condensate liquid in the reservoir,this paper presents a new method for predicting inflow performance of gas condensate wells which integrates phase behavior theory and flash calculation methods of gas condensate system,consideres fluid phase behavior and component difference,and employes two phase pseudo pressure function calculated by the steady state theory.Compared with the results of systematic well testing,this method is more applicable for predicting inflow performance of gas condensate wells.By employing vertical pipeline flow equation,integrating thermal flash calculation of fluid phase equilibrium,and utilizing simulation of Equation of State,a new method for predicting outflow performance of gas condensate wells is also presented.This new method is adopted in the calculation of 12 sets of measured data in three wells,and the result is of high accuracy and is more accurate than the method without consideration of phase behavior difference. It proves that this method is suitable for predicting outflow performance of gas condensate wells.In combination of the prediction methods of inflow performance and outflow performance of gas condensate wells,the method for analysing production system of gas condensate wells is more suitable in field practice and would guide the production of gas condensate wells better.

Key words: nodal analysis, phase behavior, percolation, vertical pipeline flow, gas condensate well, production system