And the same time the lower permeability is the greater starting pressure gradient and the more slow speed of pressure conduction is.

且渗透率越低，启动压力梯度越大，压力传导速度越慢。

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Research on characters of non-Darcy flow and starting pressure gradient of low permeability reservoir were foundation of reservoir production.

低渗透储层渗流具有非达西特征和启动压力梯度，是研究低渗透储层开发过程中问题的基础。

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Therefore, the impact of starting pressure gradient must be considered when analyzing the productivity of vertical fracture well in low permeability reservoir.

因此，在进行低渗透油藏垂直裂缝井产能分析时，必须考虑启动压力梯度的影响。

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