关键词: 钻井工程, 钻进效率, 岩石破碎效率, 破碎比功, 计算模型, 评价方法

Abstract:

In the evaluation of drilling efficiency in drilling engineering,the conventional drilling rate models were often used to analyze the effect of a single factor contribution on drilling efficiency.This method has the shortages of large calculation work and low comprehensive function.According to the basic rock-crushing theory,a computation model and an evaluation method for rock-crushing efficiency based on the crushing work ratio were provided by analyzing the energy consumption of rock crushing with roller bit.By using the new model and method,the rock-crushing efficiency could be analyzed in different conditions and the drilling efficiency with different bits could also be evaluated in different conditions.This model can provide the base for selection of bits,optimization of drilling parameters and analysis of drilling efficiency.The calculation result of this method also explained the basic reason for the difference of drilling speeds in the same formation between excessive balanced drilling and under-balanced drilling.

Key words: drilling engineering, drilling efficiency, rock-crushing efficiency, crushing work ratio, computation model, evaluation method