MECHANICAL AND TRIBOLOGICAL PROPERTIES OF DRILLING TOOL BITS: A REVIEW

Abstract

Drill bits employed in oil and natural gas exploration operate under extremely harsh tribological environments characterized by high contact stresses, abrasive rock formations, elevated temperatures, corrosive drilling fluids, and cyclic impact loading. The performance, reliability, and service life of these drilling tools are largely governed by their mechanical and tribological characteristics. Therefore, the development and selection of drill bit materials require an optimal combination of high wear resistance, superior hardness, low coefficient of friction, excellent fracture toughness, thermal stability, and resistance to erosion and corrosion. Wear mechanisms such as abrasive wear, adhesive wear, erosive wear, thermal degradation, and fatigue-induced failure significantly influence drilling efficiency and operational costs. Advanced materials, including tungsten carbide composites, polycrystalline diamond compact cutters, thermally stable polycrystalline diamond, cubic boron nitride, and other superhard materials, have been extensively utilized to enhance performance under severe drilling conditions. This review summarizes the essential mechanical and tribological properties required for drill bits used in oil and gas exploration and discusses their influence on drilling efficiency, bit longevity, and failure prevention. Understanding these properties is important for the design and development of next-generation drilling tools capable of operating efficiently in increasingly demanding geological environments.