低速非达西渗流复合油藏DST段塞流试井分析

WELL TEST ANALYSIS OF SLUG FLOW IN COMPOSITE RESERVOIRS OF LOW-VELOCITY NON-DARCY FLUID FLOW

在分析实际低速非达西复合油藏DST测试非自喷井渗流规律的基础上 ,导出了其有效井径数学模型 ,并利用Laplace变换及特殊物理方程理论 ,导出了该模型的拉氏空间解析解 ;利用简便的Stehfest数值算法进行数值反演 ,得出了实空间解 ,绘制了无因次样板曲线。

Based on the low-velocity non-darcy fluid flow theory in porous media of Non-Open flow wells in composite reservoirs, the effective wellbore radial model of this kind of well test was derived, the solution of this model was gotten in Laplace space with Laplace transformation and special physical equations theory, then the real space solution was gotten by convenient Stehfest's numerical Laplace reverse transformation. The new type curve of the model was also obtained. The model described in this paper can be used for slug well test analysis in low permeability reservoirs.