超完善井条件下三重介质试井解释模型求解方法

无论是均质油藏还是碳酸盐岩油藏试井解释模型,求解时负表皮系数会引起早期数据的不稳定。将Ramey提出的无限大均质油藏负表皮系数计算方法推广至具有边界的多重介质油藏,即引入折算半径的同时,对无因次时间、井筒储存系数、窜流系数以及测试井到边界的距离进行修正。计算结果表明,利用该方法求解解释模型,早期数据不发散、稳定性好。

Solving methods of triple-medium well testing interpretation model for super-perfect wells

When well testing interpretation models applied to sandstone or carbonate reservoirs were solved, the instability of early phase data was caused by negative skin coefficient. The solving method, suitable for infinite homogeneity reservoirs proposed by Ramey, was extended to the multi-medium reservoir with boundary. The effective radius was introduced, and the parameters including dimensionless time, wellbore storage coefficient, crossflow coefficient and the distance from testing well to boundary were revised. The calculation results show that the stability of early phase data was improved greatly by the new solving method.