低速非达西渗流中气井、油井试井分析方程的统一  

IN LOW VELOCITY NON DARCY PERCOLATION FLOW THE UNITY OF WELL TEST ANALYSIS EQUATIONS USED FOR GAS AND OIL WELLS RESPECTIVELY

作　　者：贾永禄[1] 谭雷军 冯曦[2] 钟孚勋[2] 

机构地区：[1]西南石油学院石油工程系 [2]四川石油管理局勘探开发研究院

出　　处：《天然气工业》2000年第3期70-72,共3页Natural Gas Industry

摘　　要：在致密气藏中 ,由于吸附水膜的影响、岩石孔隙道喉道狭窄、连通性差、渗透率极低 ,加之气液固相间表面吸附力的作用等原因 ,在低渗油藏、气藏中均存在启动压力梯度问题 ,即流体在多孔介质中的流动不再符合达西定律 ,而是遵从低速非达西渗流规律 ,四川石油管理局勘探开发研究院的室内实验已证明了这一点。在等温、单相、层流及忽略气体滑脱效应的条件下 ,气体低速非达西渗流与液体低速非达西渗流无因次渗流方程完全一样 ,但气井试井有压力法、压力平方法、拟压力法等 ,其无因次压力及无因次启动压力梯度定义均不一样 ,这给试井解释带来极大不便。文章在引入了拟体积系数概念基础上 ,再通过引入拟真实启动压力梯度的概念 ,首次实现了气井、油井低速非达西流中试井分析方程的统一 ,从而便利于低速非达西流试井分析理论的研究与教学 。In tight reservoirs,owing to the reasons for the influence of adsorbed water films,narrow pore throats,bad connectivity,extremely low permeability and the effect of surface adsorptive forces among gas,liquid and solid,etc.,the problem with starting pressure gradient is always found in low permeability oil and gas reservoirs,i.e.the flow of fluids in porous media is no longer accordant with Darcy's low and follows low velocity non Darcy percolation flow law,which has been proved by the laboratory test in the Geological Exploration and Development Research Institute of SPA.Under the conditions of isothermal,single phase,laminar flow and neglecting gas slippage effect the dimensionless percolation flow equation of expressing gas low velocity non Darcy percolation flow is fully the same as that of expressing liquid low velocity non Darcy percolation flow,however the methods of gas well testing include pressure method,square pressure method and pseudopressure method,etc.,and the definitions of their dimensionless pressures and dimensionless starting pressure gradients are different from each other,which makes well test interpretation very inconvenient.On the basis of introducing the concepts of the pseudo volume factor and pseudo actual starting pressure gradient,the unity of well test analysis equations used for the low velocity non Darcy flow in gas and oil wells respectively is realized for the first time by the authors,so as to be convenient to do the research and teaching of the low velocity non Darcy flow well test analysis theory and to greatly simplify the design of well test analysis software.

关 键 词：试井解释 气井 油井 压力梯度 数学模型 渗流 

分 类 号：TE353[石油与天然气工程—油气田开发工程]