Abstract
Due to some deficiencies in the existing researches of cutting element wear of polycrystalline diamond compact (PDC) drill bit and to reduce the wear rate of cutting element of PDC bit, accurately illustrate the effect of tooth-distributing angle on cutting element, and improve the service life of PDC drill bit, we use the geometry knowledge of PDC drill bit and establish the torsion vibration model of PDC drill bit, solve and analyze the model, and at last analyze the effect of tooth-distributing angle on the rule of cutting element wear by using the wear theory.
Highlights
The results of polycrystalline diamond compact (PDC) drill bit rock breaking are affected by many factors, including the weight on bit (WOB), rotation speed, torque, which are related to load, and the cutters’ density and tooth-distributing angle, which related to structure
According to some materials used by PDC drill bit, the literature [3] carried out a detailed study and the author believed that the main reasons for the failure of cutting element were wear resistance and poor impact toughness of WC-Co carbide which could not withstand harsh working environment at bottom hole
Compared with the existing research methods in the references which consider cutting element wear just from the point of statics or the whole view of bit, our paper has analyzed cutting element wear affected by PDC toothdistributing angle based on torsion vibration, which makes computational accuracy improve by about 10%∼20%
Summary
The results of polycrystalline diamond compact (PDC) drill bit rock breaking are affected by many factors, including the weight on bit (WOB), rotation speed, torque, which are related to load, and the cutters’ density and tooth-distributing angle, which related to structure. Based on the dynamics and tribology, we have analyzed the effect of the drill bit’s tooth-distributing angle on the law of cutting element wear. Given the WOB, speed, and torque as load parameters and the bit blade number and cutters’ density as structure parameters, we have established the mathematical model of the wear rule affected by tooth-distributing angle, which is based on the dynamic wear theory. The results of the model can obtain the quantitative indicators which have a guiding significance to the optimization on tooth distribution of PDC drill bit
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