低速非达西双渗油藏DST段塞流测试渗流模型及应用

本文在分析了实际低速非达西双渗油藏DST段塞流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，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Stehfest数值算法进行数值反演，得出了实空间解，并绘制了无因次样板曲线。结果表明：启动压力梯度、层问储容比、地层系数比的变化对段塞流试井解释结果有较大的影响。当窜流系数比较大时，在晚期段曲线几乎相交于同一条曲线；但是当窜流系数比较小时，层间储容比、地层系数之比对于压力曲线的后期段有较大的影响，曲线后期段上翘。采用本模型绘制的样板曲线，能较大程度上提高拟合精度，可有效运用于现场DST段塞流试井分析。

The percolation model and applications of slug flow well test of double permeability reservoirs with Low-Velocity Non-Darcy

Based on the Low-Velocity Non-Darcy fluid flow theory of Non-open flow wells in double permeability reservoirs,the effective well-bore radial model of this kind of well test is derived.The solution of the model is gotten with Laplace transformation and special physical equations theory,then the real space solution is gotten by convenient Stehfest's numerical Laplace reverse transformation and the new type curve of the model is also obtained.The result shows that the change of gradient of kick-off pressure,the storage ratio and the ratio of formation coefficients have relatively big effect on the slug flow well test result.When channel flow factor is relatively big,the curve is nearly crossing on the same curve during later period.But when channel flow factor is relatively smaller,storage ratio and the ratio of formation coefficients have relatively big effect on the later stage of pressure curve which appears up-warp.The new type curve of this model can improve the fitting precision at greater degree and can be applied to analyze effectively Scene DST slug flow well test.The model described in this paper can be used for DST slug well test.