肇州油田水平井水平段压降计算及测试

水平井水平段的流动为变径入流量的变质量流动，根据动量守恒方程建立了水平段流动的压力梯度基本方程；通过不同位置的采液指数变化，表征水平井筒中的流动与油藏渗流的耦合，考虑孔眼入流情况下的管壁摩阻系数，建立了一套系统的水平井水平段压降计算模型及方法。水平段压力损失由摩阻压力损失、加速压力损失、混合压力损失以及势能压力损失等四部分组成。对肇州油田州62-平61井水平段压降进行了计算，并在相同生产条件下进行了测试，计算值与实测值误差6％。计算表明，肇州油田9口水平井的水平段总压降大约在0．048～0．26MPa。

Calculation and Measurement of Pressure Drop of Horizontal Interval of Horizontal Wells in Zhaozhou Oilfield

The flow in horizontal interval of horizontal wells is characterized by variable mass flow with variable inflow through perforations. In this work, the basic equations of flow pressure gradient in horizontal interval are evolved from the momentum conservation equation. Considering the flow coupling between well bore flow and reservoir filtering flow by variable located fluid productivity index along the horizontal interval, an integrated model for pressure drop in horizontal well bore is established, which concerns the friction factor of perforated pipe with inflow. The pressure loss in horizontal well bore includes frictional loss, acceleration loss, fluid mixing loss and potential energy loss. The model has been used to predict the pressure drop in horizontal well bore of Well Zhou66-61 in Zhaozhou oilfield, and the result of which has a relative discrepancy of 6% comparing to the real tested value. The total pressure loss of these 9 horizontal wells in Zhaozhou field varies from 0.048MPa to 0.26MPa.