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<p>As drilling operations are essential at the initiation of various subsurface industries, optimizing drilling processes based on accurate and simple rate of penetration (ROP) models is of importance in enhancing industrial efficiency. In this study, we investigated the applicability of Miyazaki’s ROP model, which assumes that ROP is proportional to the square of the weight on bit (WOB), through a series of laboratory drilling experiments using polycrystalline diamond compact (PDC) bits. Dimensional and statistical analyses of the experimental results revealed that the power law exponent depends primarily on bit wear and is generally independent of rock strength, bit rotation speed, and bit diameter. When the dull grade of International Association of Drilling Contractors reaches or exceeds 1, Miyazaki’s ROP model is applicable under typical drilling conditions. In contrast, we found that the model does not hold for conventional roller-cone bits, irrespective of their wear state. Applications of Miyazaki’s ROP model to practical drilling operations suggest that the model yields predictions consistent with field observations, provided that the nondimensional WOB values in field and laboratory conditions are comparable. Prospective refinements of the model deserve future study by incorporating practical hydraulics, water-saturated conditions, and uniqueness of drilling parameters.</p>

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Applicability of a Laboratory-Based Rate of Penetration Model for a Polycrystalline Diamond Compact Bit to Various Drilling Conditions

  • 期刊论文

  • 发表日期：

    2026年1月6日

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  • Shunya Kaneki,
  • Kuniyuki Miyazaki

摘要

As drilling operations are essential at the initiation of various subsurface industries, optimizing drilling processes based on accurate and simple rate of penetration (ROP) models is of importance in enhancing industrial efficiency. In this study, we investigated the applicability of Miyazaki’s ROP model, which assumes that ROP is proportional to the square of the weight on bit (WOB), through a series of laboratory drilling experiments using polycrystalline diamond compact (PDC) bits. Dimensional and statistical analyses of the experimental results revealed that the power law exponent depends primarily on bit wear and is generally independent of rock strength, bit rotation speed, and bit diameter. When the dull grade of International Association of Drilling Contractors reaches or exceeds 1, Miyazaki’s ROP model is applicable under typical drilling conditions. In contrast, we found that the model does not hold for conventional roller-cone bits, irrespective of their wear state. Applications of Miyazaki’s ROP model to practical drilling operations suggest that the model yields predictions consistent with field observations, provided that the nondimensional WOB values in field and laboratory conditions are comparable. Prospective refinements of the model deserve future study by incorporating practical hydraulics, water-saturated conditions, and uniqueness of drilling parameters.