Abstract: Based on turbulent jet theory and laboratory experiments, models used for computing the velocity of axial and radial flow are suggested and a series of equations for calculating bottom-hole hydraulic parameters are proposed for reference in qualitative analysis and comparison. Reduction of the distance from the nozzle exit to the bottom hole that can increase hydraulic ist energy is also discussed that may provide useful information in the arrangement of nozzles on jet bits.

摘要： 本文在湍流射流理论的基础上,通过室内单股水射流的多次实验,提出和验证了射流轴心速度及径向速度的计算模式,并进一步推导了一组井底水力参数的近似计算式,可供定性分析及对比井底水力参数时参考。文中还讨论了缩短喷距可以提高射流作用到井底的能量问题,可供改进喷射钻头喷嘴布置时参考。