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

[1]  H. Zhang,et al.  An Innovative System of Deep In Situ Environment Reconstruction and Core Transfer , 2023, Applied Sciences.

[2]  Yi-Wei Zhang,et al.  Structural Improvement of Differential Motion Assembly in In Situ Pressure-Preserved Coring System Using CFD Simulation , 2023, Applied Sciences.

[3]  Wei Huang,et al.  Development of an In-Situ Simulation Device for Testing Deep Pressure-Preserving Coring Tools under High-Temperature and Ultrahigh-Pressure Conditions , 2023, Applied Sciences.

[4]  Mingzhong Gao,et al.  A Review of Sampling Exploration and Devices for Extraterrestrial Celestial Bodies , 2022, Space Science Reviews.

[5]  Liang Zhu,et al.  Pressure control method and device innovative design for deep oil in-situ exploration and coring , 2022, Petroleum Science.

[6]  Dingming Wang,et al.  Structural Design and Dynamic Simulation Optimization of the Triggering Device in a Pressure-Holding Controller for Deep in Situ Coring , 2022, Applied Sciences.

[7]  M. Gao,et al.  Research on in-situ condition preserved coring and testing systems , 2021, Petroleum Science.

[8]  Zhenkun You,et al.  Contact performance analysis of pressure controller’s sealing interface in deep in-situ pressure-preserved coring system , 2021, Petroleum Science.

[9]  Chengbin Fu,et al.  Hollow glass microspheres/silicone rubber composite materials toward materials for high performance deep in-situ temperature-preserved coring , 2021, Petroleum Science.

[10]  Chuanli Wang,et al.  Theoretical and simulation analysis on rock breaking mechanical properties of arc-shaped PDC bit , 2021, Energy Reports.

[11]  Jun Li,et al.  Experimental and numerical investigations on rock-breaking mechanism of rotary percussion drilling with a single PDC cutter , 2021, Journal of Petroleum Science and Engineering.

[12]  K. Gao,et al.  3D numerical simulation study of rock breaking of the wavy PDC cutter and field verification , 2021 .

[13]  Heping Xie,et al.  Experimental study on rock mechanical behavior retaining the in situ geological conditions at different depths , 2021 .

[14]  Wu Zhao,et al.  Measuring the effect of residual stress on the machined subsurface of Inconel 718 by nanoindentation , 2021, PloS one.

[15]  Heping Xie,et al.  Design and Verification of a Deep Rock Corer with Retaining the In Situ Temperature , 2020 .

[16]  Heping Xie,et al.  Exploring Deep-Rock Mechanics through Mechanical Analysis of Hard-Rock In Situ Coring System , 2020 .

[17]  Zhao Yan,et al.  Simulation and experimental study on temperature and stress field of full-sized PDC bits in rock breaking process , 2020 .

[18]  Feng Gao,et al.  Theoretical and technological exploration of deep in situ fluidized coal mining , 2019, Frontiers in Energy.

[19]  Ligang Zhang,et al.  Evaluation of rock abrasiveness class based on the wear mechanisms of PDC cutters , 2019, Journal of Petroleum Science and Engineering.

[20]  Jeen-Shang Lin,et al.  Mechanical specific energy versus depth of cut in rock cutting and drilling , 2017 .

[21]  Zheng Liang,et al.  Failure analysis and optimum structure design of PDC cutter , 2017 .

[22]  X. H. Zhu,et al.  3D mechanical modeling of soil orthogonal cutting under a single reamer cutter based on Drucker–Prager criterion , 2014 .

[23]  Wei Luo,et al.  Study on heat transfer model theory and numerical simulation used in deep rock in-situ temperature-preserved coring , 2023, Thermal Science.

[24]  Xinxin Xu,et al.  Modeling and experimental research on temperature field of full-sized PDC bits in rock drilling and coring , 2022, Energy Reports.

[25]  Xia Hua,et al.  Numerical study of influence of deep coring parameters on temperature of in-situ core , 2019, Thermal Science.

[26]  Jing Xie,et al.  The optimization of pressure controller for deep earth drilling , 2019, Thermal Science.

[27]  Jan-Eric Ståhl,et al.  Modeling Effect of Surface Roughness on Nanoindentation Tests , 2013 .

[28]  Jiaxing Fan,et al.  Truth-Preserving Coring Tool for Broken and Soft Mineral Stratum , 2011 .