Designing new generation drill bits with optimal axial eccentricity

The technical and economic performance of well drilling largely depends on the design of a drilling tool. Inconsistency of the drill bit design with the geotechnical conditions decreases the rate of drilling and shortens the service life of the tool, which, in turn, increases the drilling cost and electrical energy consumption. For enhancing the productivity and performance of drilling tools, new design solutions are required. This article presents the structure of the lab-scale bench tester for studying the process of cutting–abrasive drilling with a drill bit. The authors discuss the ways of improving performance of the new-design drill bits by ensuring uniform loading and wear of the bit teeth on the novel bench tester to practice the mechanism of rock destruction at well bottom. Optimization of the bit teeth paths and well bottom coverage is addressed. The new-generation drill bits designed with assistance of the new bench tester will be advantageous for the uniform wear of teeth, certain number of gear ratios, as well as for the equal contact and volumetric destruction per drill bit teeth. Furthermore, with increase in the axial load on the bit, the drill performance will increase evenly over the well bottom area, and no computational formulas are required for determining the most effective number of teeth.

Toshov J. B., Toshov B. R., Baratov B. N., Haqberdiyev A. L. Designing new generation drill bits with optimal axial eccentricity. MIAB. Mining Inf. Anal. Bull. 2022;(9):133142. [In Russ]. DOI: 10.25018/0236_1493_2022_9_0_133.

J.B. Toshov¹, Dr. Sci. (Eng.), Professor, e-mail: toshov@tdtu.uz,
B.R. Toshov, Cand. Sci. (Phys. Mathem.), e-mail: toshov_b@mail.ru, Navoi State Mining Institute, 210102, Navoi, Uzbekistan,
B.N. Baratov¹, Graduate Student, e-mail: Bakhtiyor.baratov@yandex.ru,
A.L. Haqberdiyev¹, Assistant Professor, e-mail: alim.haqberdiyev2017@yandex.ru, ORCID ID: 0000-0002-8386-4036,
¹ Tashkent State Technical University, 100095, Tashkent, Uzbekistan.

B.N. Baratov, e-mail: Bakhtiyor.baratov@yandex.ru.

1. Yahiaoui M., Paris J.-Y., Denape J., Dourfaye A. Wear mechanisms of WC-Co drill bit inserts against alumina counterface under dry friction: Part 1. WC-Co inserts with homogenous binder phase content. International Journal of Refractory Metals and Hard Materials. 2015, vol. 48, pp. 245—256.

2. Mannanov U., Toshov J., Toshniyozov L. Perspective solutions for the design of drilling tools. E3S Web Conference. 2019, vol. 105, article 3027. DOI: 10.1051/e3sconf/201910503027.

3. Steklyanov B. L. O zakonomernostyakh energopotrebleniya dinamicheskikh sistem v usloviyakh soprotivleniya [On the regularity of energy consumption of dynamic systems in a resistance environment]. Tashkent, Fan, 2013.

4. Šporin J., Balaško T., Mrvar P., Janc B., Vukelić Ž. Change of the properties of steel material of the roller cone bit due to the influence of the drilling operational parameters and rock properties. Energies. 2020, vol. 13, no. 22, article 5949. DOI: 10.3390/en13225949.

5. Steklyanov B. L., Rakhimov R. M., Valieva K. G., and Bariev M. B. Theoretical aspects of gland formation during well drilling. Uzbekistan Journal of Oil and Gas. 2003, no. 2, pp. 20—22. [In Russ].

6. Toshniyozov L. G., Toshov J. B. Theoretical and experimental research into process of packing in drilling. MIAB. Mining Inf. Anal. Bull. 2019, no. 11, pp. 139–151. [In Russ]. DOI: 10.25018/02361493-2019-11-0-139-151.

7. Pyalchenkov V. A., Smolin N. I. Distribution of axial load and torque along the teeth of the cone bit. Modern problems of science and education. 2015, no. 2-2, pp. 110. [In Russ].

8. Serikov D. Yu. Povyshenie effektivnosti sharoshechnogo burovogo instrumenta s kosozubym vooruzheniem [Improving the efficiency of a spherical drilling tool with a slant-toothed armament], Doctor’s thesis, Moscow, 2018, 433 p.

9. Wilczynski Z., Kaslilar A. Monitoring a spatial drilling trajectory deviation using a drillbit signal as a source. NSG2021 27th European Meeting of Environmental and Engineering Geophysics. 2021, pp. 1–5. DOI: 10.3997/2214-4609.202120180.

10. Steklyanov B. L. Ot Kak?... k Pochemu?... (Aspekty dinamiki burovykh dolot i drugikh fizicheskikh modeley) [From How? to Why? (Aspects of the dynamics of drill bits and other physical models)], Tashkent, GFNTI, 2001, 68 p.

11. Burievich T. J. The questions of the dynamics of drilling bit on the surface of well bottom. Archives of Mining Sciences. 2016, vol. 61, no. 2, pp. 275–283. DOI: 10.1515/amsc-2016-0020.

12. Baratov B. N., Umarov F. Ya., Toshov Zh. B. Tricone drill bit performance evaluation. Gornyi Zhurnal. 2021, no. 12, pp. 60–63. DOI: 10.17580/gzh.2021.12.11.

13. Toshov J., Baratov B., Baynazov U. Method of calculating the gear ratios of the cones of tricone drill bits. E3S Web Conference. 2020, vol. 201, article 1012. DOI: 10.1051/e3sconf/202020101012.

14. Trushkin O. B. Determination of the most probable gear ratios of the cone bits. Oil and Gas Territory. 2014, no. 12, pp. 28—31. [In Russ].