Research on Fidelity Performance of Coring Bits during Drilling and Cutting in Deep Extreme Environments

Deep rock formations in extreme environments are characterized by complex working conditions, various structures, high hardness, and resistance to compression. However, existing coring techniques leave the cores of deep vulnerable residual stresses, resulting poor fidelity during coring. This paper develops a rock-breaking model for structural parameters drill bits. It proposes that bit’s terms back-rake side-rake angles will affect core’s performance. In addition, mechanical specific energy maximum stress reflect effect. The accuracy theoretical was verified via simulation analysis. results show tool’s average cutting force Standard deviation increase as vary. leads increased shear friction on core, which affects energy, and, subsequently, core. ranged from 15° 25°, with optimum angle 21° producing were 0.69 0.85 times higher than highest point, respectively. range 5° 15°, 10° 0.76 0.96 finite element method error 1.21%. work’s main help reveal mechanisms drilling process contribute development bits surface processes.