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通过分析一口水平井的投入与产出随水平段长度的延伸而发生的相应变化，证实了水平并最优水平段长度的存在。在建模过程中，着重对模型目标函数的选取及水平段长度的效益约束方程进行分析研究。通过对绝对效益指标NPV及相对效益指标NPV／L间相直关系的分析，首次把二者融为一体，建立了以NTV（L）为目标函数以NPV／L（L）为（其中之一）约束方程的优化模型。通过模型分析及实例印证，可以清楚地看出，如果则除以NPV／L（L）指标为约束条件的效益约束方程，水平段长度就会设计得过长，并且，即使对于同一口水平并在其所在区块内，是否有直井混入，其最优水平段长度值各不相同，定性地，采用水平井与直井混合开发时的最优水平段长度要大于全部采用直井开发时的最优水平段长度值。
By analyzing the corresponding changes in the inputs and outputs of a horizontal well with the extension of the length of horizontal section, the existence of horizontal and optimal horizontal section length is confirmed. In the modeling process, we focus on the selection of the objective function of the model and the efficiency constraint equations of the horizontal segment length. Based on the analysis of the relationship between NPV and NPV / L, NPV / L (L) was established for the first time by combining NPV / L with NPV / L ) Optimization Model of Constraint Equation. Through the model analysis and example verification, it is clear that if the NPV / L (L) index is used as the constraint constraint, the length of horizontal segment will be designed too long, and even for the same level In the area where they are located, whether there is vertical well mixing or not, the length of the optimal horizontal section is different. Qualitatively, the optimal horizontal section length when using horizontal well and vertical well is greater than that when all vertical wells are developed Horizontal segment length value.