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建立了水平井筒油藏流体从管壁流入时孔眼段流体压力梯度模型 ,讨论了井筒有效管壁摩擦系数对流体压力梯度的影响。在此基础上 ,建立了同时考虑井筒流体流动和油藏渗流的井筒油藏耦合模型 ,该模型将Dikken模型中沿整个水平段单位长度生产指数为常数的假定进行了推广。在给定条件下对压力降模型进行了讨论 ,计算了单个孔眼段的压力损失。计算结果表明 ,水平井段较长或产量较高时 ,水平段流体压力降比较明显。
The model of fluid pressure gradient in the borehole section of horizontal wellbore reservoir fluid flowing in from the pipe wall was established. The effect of effective wall friction coefficient on fluid pressure gradient was discussed. On this basis, a wellbore reservoir coupling model considering wellbore fluid flow and reservoir seepage is established. This model generalizes the assumption that the production index per unit length in the entire horizontal section of Dikken model is constant. Under certain conditions, the pressure drop model is discussed, and the pressure loss of a single hole segment is calculated. The calculation results show that when the horizontal section is long or the output is high, the pressure drop in the horizontal section is obvious.