凝析气藏考虑高速流动效应的油气渗流动态研究  

Study on gas condensate flow performance in porous media under influence of high velocity flow

作　　者：覃斌[1] 李相方[1] 程时清[1] 

机构地区：[1]石油大学(北京),北京102249

出　　处：《水动力学研究与进展（A辑）》2004年第5期571-577,共7页Chinese Journal of Hydrodynamics

基　　金：国家重点基础研究发展规划(973)项目(2001CB209108);国家自然科学基金项目(90210018)资助

摘　　要：　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。It has been found recently in numerous theoretical and experimental researches that capillary number and non-Darcy effect caused by high velocity flow have noticeable effect on relative permeability within the immediate vicinity of the well. The existig methods only considering non-Darcy effect are impossible to characterize the real gas and condensate flow behavior accurately. So how to understand and consider the two effects is important to analyze gas condensate flow and predict production performance.A solution problem of gas condensate two phase flow is established in this paper and the inflow performance relationship equation under pseudo steady state is derived. Based on flow mechanism of three zones, the integrated consideration of capillary number and non-Darcy effect is firstly presented. Some novel characteristics of gas condensate relative permeability and distribution state under high velocity flow have been found in the analysis of application example. By contrast of different inflow performance relationship models, the result indicates that presented method is more accurate than conventional ones to predict the production performance and to evaluate the productivity.

关 键 词：凝析气藏 高速流动 毛管数效应 非达西效应 渗流 

分 类 号：TV312[水利工程—水工结构工程]