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近期的大量理论和实验研究发现,高速流动导致的毛管数和非达西效应对近井油气相对渗透率有显著影响,而目前仅仅考虑非达西效应无法准确描述油气真实渗流状态。如何准确理解并考虑这两种效应的影响对于凝析气藏渗流动态分析以及生产动态预测有很重要的意义。本文建立了油气两相渗流的定解问题,得到了拟稳态形式的流入动态方程。在三区渗流机理上,首次综合考虑了毛管数和非达西效应对相对渗透率的影响。实例分析揭示了高速流动下油气相对渗透率变化及油气分布状态新特征。对不同流入动态模型的对比分析表明,本文方法较之现有方法更有助于正确预测生产动态,评估气井产能。
Recently a large number of theoretical and experimental studies have found that the capillary tube number and non-Darcy effect caused by high-speed flow have a significant impact on the relative permeability of near-well oil and gas. However, the current non-Darcy effect can not accurately describe the actual oil and gas seepage conditions. How to accurately understand and consider the effects of these two effects is of great significance to the dynamic analysis of seepage flow and production prediction in condensate gas reservoirs. In this paper, the problem of the fixed solution of oil-gas two-phase seepage is established, and the inflow dynamic equation of quasi-steady state is obtained. In the three-zone seepage mechanism, the effect of capillary number and non-Darcy effect on relative permeability is considered for the first time. The case study reveals the new characteristics of the relative permeability change and the hydrocarbon distribution under high velocity flow. The comparative analysis of different inflow dynamic models shows that the proposed method is better than the existing methods to predict the production dynamics correctly and evaluate the gas well productivity.