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用近似方法得出了各类边界供给油藏中的水平井产量公式。考虑启动压力梯度，根据水平井的椭球流态理论，通过平均质量守恒方法得到了椭球供给边界油藏中水平井的稳态产量近似公式，以及底水油藏中水平井的稳态产量近似公式；通过修正得到了含启动压力梯度的边水油藏中水平井的稳态产量公式。并给出了相应的无量纲产量公式和工程产量公式。分析表明，当启动压力梯度较小时，对产量的影响也很小，随着启动压力梯度的增大，影响增强，产量下降。
Using the approximate method, the horizontal well yield formula of various types of boundary supply reservoirs is obtained. Considering the starting pressure gradient, according to the ellipsoidal flow theory of horizontal well, the approximate formula of steady state yield of horizontal wells in ellipsoid-supplied boundary reservoirs and the steady-state output of horizontal wells in bottom water reservoir are obtained by the method of average mass conservation The approximate formula is obtained; and the steady-state output formula of horizontal well in edge water reservoir with initial pressure gradient is obtained by amendment. The corresponding dimensionless yield formula and project yield formula are given. The analysis shows that when the starting pressure gradient is small, the impact on output is also very small. As the starting pressure gradient increases, the impact increases and the output decreases.