Effect of operating parameters on tricone roller bits used in blasthole drills

摘要

Drilling performance is the culture where the decisions and actions needed to achieve improvements in drilling environment are made and driven by detailed analysis of relevant data. Drill bits have been playing a significant role in the rock drilling operations. In order to meet the needs of users, the rock drilling has experienced an impressive technological advancement particularly in the area of bit design and its performance. Today, faster penetration rate is an increasing demand. Bit performance evaluation and bit selection is of paramount importance for the drilling engineers. Rate of penetration (ROP) is one of the most important bit performance indexes. The improvement in ROP will bring increased efficiency to the drilling industry. ROP model such as Bourgoyne and Youngs Rate of penetration model have been developed by researchers for roller cone bits. This model can select optimised weight on bit and rotary speed to achieve the minimum cost per unit length of drilling. The penetration rate of a bit tooth depends on the weight on bit, rotary speed, shape and size of the tooth, and the strength of the rock. The aim of this work is to study the operating parameters such as weight on bit and rotation speed of the tricone roller bit to find out the effect of these parameters on the performance of drilling.