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roller bits


Comparative analysis of drilling characteristics of dia- mond bits and roller bits


LI Tai-yuan 

Research Institute,South Sichuan Mineral District,Luzhou 646001,China) 




:During drilling,both diamond bits and roller bits have played an important role.Because of different structures,rock breaking mechanism,drilling features and application conditions of two kinds of 

bits are different.Roller bits mainly break the rocks by knocking and crushing,aided with shearing.While diamond bits break formation through shearing,cutting and crushing.Diamond bits require 

lower WOB,high rotary speed and small flow rate,useful for hole straightening and inclining 

prevention,and it can be used high-density drilling fluids.But diamond bits cant effectively 

drill heterogeneous hard formations which contain chert,pyrite and silicastone.So,based on the 

characteristics of two kinds of bits,they can be well used in combination to achieve optimum rock 

breaking results. 



Key words:diamond bit,roller bit,structure,performance,application,correlation

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