涡流工具中液滴受力分析与工具角度优化

Drop force analysis and tool angle optimization in eddy current tool

涡流工具可以改变井下流场流态,是一种新型排水采气技术。螺旋角度对井下流场状态起决定作用。安装涡流工具的井筒流动与常规气井不同,为此对采气井筒中液滴进行受力分析,分析液滴所受到的重力、浮力、离心力、Saffman力、Magnus力等典型力的作用效果并探讨力的成因,建立液滴运动方程,在对不同力的量级进行比较后,对方程进行简化,最终求解得到最佳螺旋角的数学公式。最后采用数值模拟和现场生产数据对比的方式,验证求得数学模型的可靠性。

The eddy current tool can change the flow field of the downhole flow field and is a new type of drainage and gas recovery technology.The helix angle determines the status of the downhole flow field.The well bore flow for installation of the eddy current tool is different from that for conventional gas well.For this reason,the forces acting on droplets in gas production well bore are applied.Then the effects of gravity,buoyancy,centrifugal force,Saffman force,Magnus force and other typical forces on the droplet are analyzed and the causes of the formation of the forces are discussed.Equations of droplet motion are established.After comparing the magnitudes of different forces,the equation is simplified and the mathematical formula of the optimum helix angle is obtained.Finally,the reliability of the mathematical model is verified by comparing the numerical simulation of field production data.