然后，根据模型的数学方程推导出关于内部收益率与单井日产量和井深的方程式。

Then, according to mathematics equation of the model, an equation of internal returns ratio and daily production of single well and well depth was derived.

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然后，根据模型的数学方程推导出关于内部收益率与单井日产量和井深的方程式。

Then, according to mathematics equation of the model, an equation of internal returns ratio and daily production of single well and well depth was derived.

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