低渗凝析气藏气井产能的正确预测

地下多孔介质因具有较大的比面积而对凝析油气流体具有较强的吸附能力，多孔介质吸附对凝析油气渗流过程的影响是国内外较为关注的问题。文章在新的凝析油气渗流微分方程的基础上，通过渗流数学模型的建立与求解，建立了考虑相态变化与多孔介质吸附影响的凝析气井产能方程，探讨了凝析气井产能正确预测的方法。通过实例计算和分析，结果表明：考虑与不考虑多孔介质吸附影响的凝析气井产能存在较大的差别，凝析气井地层压力低于露点压力后，将出现反凝析液损失，将引起气井产能较快地降低，验证说明了在对凝析气井进行试井解释时可考虑采用复合气藏模型。

CORRECT PREDICTION OF GAS WELL PRODUCTIVITY FOR CONDENSATE GAS RESERVOIRS WITH LOW PERMEABILITY 1)

Underground porous media have strong adsorption capacity for condensate oil/gas fluids because of their larger specific surface area. The influence of porous media adsorption on the condensate oil/gas percolation is the issue that more attention is paid to at home and abroad. Based on the new differential equation of condensate oil/gas percolation, with building and solving the mathematical model of percolation, the productivity equation is developed for condensate gas wells considering the influence of phase state variation and porous media adsorption. The correct prediction method is discussed for productivity of condensate gas wells. With real cases calculating and analyzing, the results show there is big difference between the predicted productivities with and without considering the influence of porous media adsorption. The productivity of gas wells will decrease rapidly due to the retrograde condensate loss after the formation pressure falls below the dew point pressure. It is demonstrated the composite model of gas reservoirs may be used while the well testing interpretation for condensate gas wells.