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b指数法是对影响d指数法的钻并参数进行经验修正后建立的。d指数法是乌兹钻速方程中令K=1,e=1时得到的,这样的钻速方程只能在钻井参数不变的条件下才有效。而实际钻井中钻井参数如压差及水力因素,钻压及转速,钻头类型和钻头直径及磨损等总是不断变化的,对这些影响因素的修正,就是本文b指数法所要介绍的内容。通过实际应用证明,b指数法提高了计算和预测精度,也便于计算机处理。
b The index method is established by empirical correction of the parameters of the drills that affect the d-index method. The d-index method is obtained by setting U = 1 and e = 1 in the UD’s drilling rate equation. Such a drilling rate equation can only be valid if the drilling parameters are not changed. The actual drilling parameters such as pressure and hydraulic factors such as pressure, weight and speed, bit type and bit diameter and wear and tear are always changing, the correction of these factors is the contents of this article b index method to be introduced. Through practical application, the b-index method improves the accuracy of calculation and prediction, and also facilitates the computer processing.