用单相流复合图版解释油水两相流试井数据

Using the type curves for single-phase flow to interpret two-phase flow testing data.

在讨论油水两相渗流控制方程在PEBI网格下的离散形式的同时 ,指出数值试井与油藏数值模拟中井眼处理的不同。建立了新型的试井井筒产量模型 ,此井筒产量模型不对流动状态作任何假设 ,并可以耦合到差分方程进行求解。用此模型对油水两相流试井过程进行了分析 :在其它参数不变的情况下 ,无论油层的初始饱和度如何变化 ,压力导数曲线和压差曲线都分别与单相流的压力导数曲线和压差曲线平行且保持跨度不变。通过定义两相流的无量纲量 ,所有曲线与相同参数下的单相流曲线相重合。图 3参

While discussing the discrete form of two phase flow governing equation with PEBI grid, the authors present the difference between simulated well testing and conventional reservoir simulation on dealing with the wellbore. A new flow rate model for well testing, which makes no hypothesis for the flow state and can be coupled with the differential equations easily, is firstly constructed. Two phase flow well testing is analyzed using the above mentioned model and the results of analysis indicate that under otherwise identical parameters, the span between the pressure difference curve and the pressure derivative curve of a two phase flow remains the same as that of a single phase flow, no matter what the initial saturation and the ratio of viscosities may be. So, when given the dimensionless quantities of the two phase flow, all curves are coincident with the curve of a single phase flow under otherwise identical parameters.