基于Fluent的井下流量控制阀流道研究

Flow Channel Study of Downhole Flow Control Valve Based on Fluent

井下流量控制阀是智能井系统井下流体控制的关键部件。为了提高产量、降低压降、减少局部损失,对流量控制阀结构进行了分析,建立了流量控制阀流动模型,推导出出口流量与流道过流总面积的流量系数C;。以流量控制阀出口产量3000 m;/d为设计标准,计算出理论C;值与数值模拟得到的C;值非常接近。在设计节流阀套孔口的流道时,对节流阀套流道口的形状、过流面积和位置进行了分析,采用了百分比控制方式进行调产。研究结果表明:所得C;关系式为确定流道口过流总面积提供了理论依据;且设计的方形流道在径向角度为75°时,百分比控制方式不仅能够有效精确调节产量,还能减少流道口前后的压降;最后开设了圆锥形稳流小孔,有效地解决了流道环空的漩涡,减少了能量损失,使得内部原油流动更加稳定。研究结果可为流量控制阀进一步的优化设计提供依据。

Flow control valve is the most important components of intelligent well,and takes yield improvement,drawdown reduction and local loss decrease as the study objectives.By means of building the flow model of flow control valve,the flow coefficient C;of outlet flow and total open area of flow channel was derived.Taking the daily output of flow control valve outlet(3000 m;/d)as the design standard,the theoretical C;value was figured out,which was consistent with the C;value obtained by numerical simulation.At the time of designing the flow channel of throttle valve sleeve orifice,the shape,open area and position of throttle valve sleeve orifice were analyzed,and the percentage control method was used for production regulation.The study results show that the obtained C;relation provides a theoretical basis for determining the total open area of flow channel orifice;when the radial angle of the designed square flow channel is 75°,the percentage control can not only effectively and accurately adjust the yield,but also reduce the drawdown before and after the flow channel orifice;and the set-up of conical steady flow pinhole effectively solves the vortex in the annulus of the flow channel,reduces the energy loss,and makes the internal crude oil flow more stable.The study results provide a basis for the design of the flow control valve.