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由于水平井水平段内摩擦损失的缘故，如果水平段内压降和油藏压降相当，导致水平段末端压降很小或者为零，这种现象常常出现在高渗透层的低压降生产油藏和生产压差受到限制的锥进油藏。因而研究水平井最优长度设计方法对水平井开发方案设计具有指导意义。本文分三种情况（底水油藏、气顶底水油藏、气顶油藏）建立了油藏内流动模型、井筒内流动模型、水平井水平段最优长度数学模型，在建立模型过程中，考虑了水平段内流动状态（层流、紊流）和管壁相对粗糙度对摩擦损失和水平井产能的影响，最后通过实例计算得到了几个结论。
Due to the friction loss in the horizontal section of the horizontal well, if the pressure drop in the horizontal section and the pressure drop in the reservoir are equivalent, the pressure drop at the end of the horizontal section will be very small or zero, which is often observed in low pressure drop production of high permeable beds Conserved reservoirs with reservoir pressure limits and pressure limits. Therefore, it is instructive to study the optimal length of horizontal well design method for the design of horizontal well. In this paper, three models (bottom water reservoir, gas bottom water reservoir, gas cap reservoir) have been established in the reservoir flow model, the wellbore flow model, horizontal well horizontal optimal length mathematical model, the establishment of the model process , The effects of flow regimes (laminar flow and turbulent flow) and the relative roughness of the pipe wall on the friction loss and horizontal well productivity are considered. Finally, several conclusions are obtained through examples.