水平井井筒内压力产量变化规律研究

对水平井生产系统进行分析，必然涉及到井筒中的流动问题，过去人们不考虑水平井井筒中的压降，这给水平井的生产系统分析带来较大的误差。本文考虑井筒摩擦和加速度对井筒压降的影响，同时考虑地层渗流和水平井筒流动，建立了水平井井筒流动与地层流动耦合的数学模型，以此获得了计算水平井井筒压降和产量分布的表达式，实例计算和分析了海上油藏一口水平井井筒的压力和产量变化规律。本文的研究为水平井的生产系统分析提供了理论基础。

Variation laws of pressure and production rate in horizontal well

In order to analyze the production system of a horizontal well, it is necessary to deal with flow in horizontal wellbore. Pressure drop in horizontal well was ignored before and this results in bigger error in analyzing production system of horizontal wellbore. In this article, considering the effect on pressure drop in horizontal well by wall friction and acceleration, we set up a mathematical model coupling of the formation seepage flow and the flow in horizontal wellbore. So we got the expression of pressure drop in horizontal well and influx distribution. As an example we calculated and analyzed the valiation laws of wellbore pressure and production for a horizontal well in an offshore reservoir. This article presents a theoretical basis for analyzing production system of horizontal well.