抽油泵阀球密度优化研究

Research of Oil Well Pump by Density of Valve's Ball

抽油泵的整个工作过程中,阀球的启闭非常频繁,而阀球密度影响着开启压差,制约开启滞后时间及关闭滞后时间。基于流体力学相关理论和质量守恒定律,建立了泵筒内流体的连续性方程及阀球运动微分方程,分析不同阀球密度对滞后开启时间、滞后关闭时间及总滞后时间的影响。计算结果表明:滞后时间随着阀球密度的增大而减小,当密度小于4×103 kg/m3时,滞后时间变化迅速;当密度大于4×103 kg/m3时,变化缓慢。

In the whole process of the oil well pump,opening and closing of the valve ball are very frequent,but the valve ball density affects the open differential pressure and restricts its retarda- tion time and down time. Based on fluid mechanics theory and the law of conservation of mass, continuity equation of fluid into the pump and differential equation of movement of the valve ball is established, and the effect of different density of valve ball on its retardation time and down time is analyzed. The calculation results show that its retardation time and down time is reduced with the increase of the density of the valve ball. When the density is less than 4 X 103 kg/ma , its retardation time and down time changes quickly;when the density is greater than 4× 10a kg/ma , its retardation time and down time changes slowly.