The drilling of hard rock formations at depth demands higher rock-breaking efficiency, whereas conventional shear methods are energy-intensive and limit the rate of penetration (ROP). This paper addresses the PDC bit rotary impact drilling scenario and constructs a unified framework of “multi-factor mechanism efficiency”. Based on energy balance models, laboratory impact cutting experiments, and field well data, the study systematically quantifies the effects of rock mechanics properties, tool geometry, impact frequency amplitude, and the coupling of weight on bit (WOB) and rotational speed on energy consumption and ROP. The results show that a combination of impact frequency of 25-35 Hz and WOB of 70-90 kN can reduce specific energy consumption by 28% while improving ROP by 42%. Among these factors, impact frequency contributes most significantly (0.34), followed by rock brittleness (0.27). The reliability of the findings is validated through orthogonal analysis and significance testing. The study further reveals the intrinsic relationship between energy input distribution and crack propagation under rotary impact conditions, providing a quantifiable basis for the design and process optimization of deep well hard rock drill bits.
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Share and Cite
Sun, X., Qin, Z., Lei, Z. (2025) Study on the Influencing Factors of PDC Bit Rotating Percussion Rock Breaking Efficiency. Scientific Research Bulletin, 2(2), 22-29.