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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The influences of threshold pressure gradient, vertical heterogeneity, subzone thickness and areal sand thickness distribution on development of low-permeability heterogeneous reservoirs are analyzed.

根据低渗透非均质油藏的特点，分析了启动压力梯度、纵向非均质性、小层厚度和平面砂体厚度展布对该类油藏开发的影响。

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In view of seepage process in vertical fracture well in low permeability reservoir, considering kickoff pressure gradient and media deformation coefficient, bilinear flow model is established.

针对低渗透地层垂直裂缝井的渗流过程，考虑了启动压力梯度和介质变形系数的影响，建立了三线流模型。

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