水平井筒流体变质量流动压力梯度模型

PRESSURE GRADIENT MODEL FOR VARIABLE MASS FLUID FLOW IN HORIZONTAL WELLBORE

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。

A pressure gradient model for fluid inflow from tube wall in perforation section is presented. The effect of effective wall friction factors on pressure gradient is discussed. The coupling model for wellbore and reservoir is developed. The supposation that the productivity index is constant along a horizontal well is extended. The pressure drop model is discussed, and the pressure loss for single perforation section is calculated. The calculation shows that the pressure drop is obvious for the well with a longer horizontal section and high production.