Experimental study of impregnated diamond bit, Part 1: Bit wear
Year: 2025
Type: article
Abstract: Impregnated diamond bits are designed with segments containing multiple layers of embedded diamonds. As the outermost layer of diamonds wears out, the next layer of sharp diamonds is exposed, sustaining performance in drilling hard and abrasive formations. Although allowing diamonds to wear fully before renewal may seem optimal for bit life, industry practices often prioritize maintaining sharp diamonds. This raises a key question: which approach delivers greater efficiency? Answering this question requires a clear understanding of bit wear mechanisms, the variables governing their occurrence, and associated wear rates. Previous studies have described different wear mechanisms, but most have been qualitative and lacked methods to quantify the bit wear state and wear rate. This research addresses these gaps by: (i) developing a systematic experimental methodology to track bit wear while drilling, and (ii) conducting a comprehensive study to identify dominant wear mechanisms and quantify wear rates under various drilling conditions. With the proposed methodology, bit wear was investigated across seven rock types, five depths of cut (thickness of rock removed per bit revolution), and three angular velocities. The results led to the development of a conceptual wear model governed by depth of cut, identifying three distinct wear regimes and two critical depths of cut. Wear rates for each regime were quantified for rock types studied. The model provides a practical framework to select the optimum depth of cut based on rock properties. A sequel of this paper will explore the relationship between bit wear state and drilling response that is defined as the relation between depth of cut and forces (axial thrust and torque) acting on the bit.
Source: Wear
Authors: Rui Huang, Thomas Richard, Masood Mostofi
Institution: Curtin University
Language: English
Subfield: Ocean Engineering
Field: Engineering
Domain: Physical Sciences
Open Access status: hybrid
Estimated APC paid: $5,394
OpenAlex ID: W4417295309