计算空气钻井参数的新方法

A New Method for Calculating Air Drilling Parameters

以往沿用的空气钻井参数计算方法，因其依据的假设条件带有局限性而存在理论的缺陷。为了解决这一问题，从力学分析入手，通过对环空中气体举升能力最小的“关键点”处的颗粒受力分析，应用两相流动动力学和气体动力学原理，探讨了空气钻井中携带岩屑的最小排量问题。在此基础上，提出了计算空气钻井参数的方法和公式，弥补了过去一些缺陷。

A study is initiallied by analysing the forces acting on rock cutting particles at the 'critical point' where the lift capacity of air is minimum in annulus. Twophase flow theory and air dynamics are used to calculate the minimum air volume required to carry the rock cuttings out of annulus from a new viewpiont. Thus, the shortcomings of previous researchers are rectified. A complete set of method for calculating all air drillingparameters are proposed.