624.014

PDC drill bit, finite element method, modeling, stress-strain state, thread, welding joint.

The article presents finite-element simulation results of the PDC drill bit’s operational stress-strain state in order to determine the most stressed and deformed areas in drill bit’s operation. Operational stress-strain state of drill bit definition is important because external diameter of the drill bit is the main operation parameter; and drill bit external diameter decreasing is a cause of drill bit failure. There were simulated operations of PDC drill bit with welded blades and a solid drill bit. The authors used the Ansys Workbench (academic license version) to specify the biggest deformation areas. They are the welding joint areas and thread area. The authors considered the dependence of stresses and strains in these areas on the thickness of a welding joint. We can conclude that bits with welded blades are more prone to external diameter deformation; they have worse performance. This fact stipulates requirements for technology improvement of manufacturing these types of bits.

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1. Diamond bit wear codes: website. URL: http://vbs-service.ru (date of access: 03.04.2020).
2. Khorunov V. B, Stefaniv B. V., Sabadash O. M., Voronov V. V. Features of wear and maintainability criteria for drill bits with diamond carbide cutters. Automatic welding. 2012. No. 10. P. 43–47. [Іn Russian].
3. Blinkov O. G. Possibilities of physical modeling of the stress-strain state of the supporting elements of a conical bit. UGSU News. 2017. 1 (45). P. 65–67. [Іn Russian].
4. Solonychnyi V. V., Vakaliuk V. M., Liakh Y. M., Zhuravlev D. Yu. Stress-strain state of composite materials. Scientific Bulletin of the Ivano-Frankivsk National Technical University of Oil and Gas. 2011.
   № 2. P. 28–30.
5. Dinescu S., Kertész (Brînaș) I., Vesa (Benea) M. Study on the stress and strain of the drill bits using the finite element method. MultiScience – XXXII. MicroCAD: International Multidisciplinary Scientific Conference University of Miskolc (5–6 September, 2018.). 2008.
6. Saadati M., Forquin P., Weddfelt K., Larsson P.-L., Hild F. Granite rock fragmentation at percussive drilling – experimental and numerical investigation. International Journal for Numerical and Analytical Methods in Geomechanics. 2014. 38 (8). Р. 828–843.
7. Burkov P. V. et al. Computer Simulation of Strain at Drilling with PDC Bits. Applied Mechanics and Materials. 2015. Vol. 770. Р. 461–463.
8. Guangjian D., Ping C. 3D Numerical Simulation and Experiment Validation of Dynamic Damage Characteristics of Anisotropic Shale for Percussive-Rotary Drilling with a Full-Scale PDC Bit. Energies. 2018. № 11. P. 13–26.
9. Zhou Y., Wang L. Study on Optimum Structural Design of Roller Bit Bearing Double Rubber Ring Seal. International Journal of Science and Research (IJSR). 2016. Volume 5. Issue 6. P. 48–58.
10. Pei J., Yinghu Z., Zhenquan W., Dongyu S. Numerical simulation of polycrystalline diamond compact bit rock-breaking process based on smooth partcle hydrodynamic-finite element coupling method. Proceedings. 2013. № 2.
11. Srinivas V. Design and Analysis of Drill Bit with Various Materials Using ANSYS. Journal of Engineering and Applied Sciences. 2018. № 13. Р. 5218–5221.
12. Ju P., Wang Z., Zhai Y., Su D., Zhang Y. & Cao Z. Numerical simulation study on the optimization design of the crown shape of PDC drill bit. Journal of petroleum exploration and production technology.
    2014. № 4. Р. 343–350.
13. Callejo A., Arbatani S., Kövecses J., Kalantari M., Marchand N. Drill Bit Contact Dynamics Including Side Cutting: Simulation and Validation. Journal of Energy Resources Technology. 2017. № 139. Р. 184–197.
14. Shi J., Wang J., Liu X. The Nonlinear Dynamics Simulation of Drill String-drill Bit-rock Based on ABAQUS: 2nd International Conference on Civil, Materials and Environmental Sciences (April, 2015.) 2015.
15. Fourmeau M, Kane A, Hokka M. Experimental and numerical study of drill bit drop tests on Kuru granite. Phil. Trans. R. Soc. 2016. № 375.
16. Hrydzhuk Y. S. Research of axial force and the torque action on a drill string at rotary and combined drilling methods. Scientific Bulletin of Ivano-Frankivsk National Technical University of Oil and Gas.
    2018. № 2 (45). Р. 7–15.
17. Zhang W., Dang W., Chen W., Zhang Y. Individual Drilling Bit Design and Optimization in Mahu Area. MATEC Web of Conferences, 2017. 128.
18. Zaloga V. A., Krivoruchko D. V., Khvostik S. N. Imitation model of rectangular free cutting. Bulletin of Sumy State University. 2005. № 11. C. 55–66. [Іn Russian].
19. Hlembotska L., Balytska N., Melnychuk P., Melnyk O. Computer modelling power load of face mills with cylindrical rake face of inserts in machining difficult-to-cut materials. Scientific Journal of TNTU. 2019. Vol. 93. No. 1. Р. 70–80.
20. Kovalchuk Ya., Shynhera N., Сhornomaz N. Stress-strain state of a bottom chord of a welded roof truss. Scientific Journal of TNTU. 2019. Vol. 93. No. 1. Р. 41–46.