Scholarly record
IMPROVING DRILLING PERFORMANCE THROUGH OPTIMIZATION OF TUNGSTEN CARBIDE ARMAMENT GEOMETRY IN DIRECTIONAL WELLS
Abstract
Directional drilling operations involve complex mechanical and hydraulic interactions that often lead to inefficient weight transfer, excessive torque and drag, vibration-induced dysfunctions, and inadequate hole cleaning, thereby reducing drilling efficiency and increasing operational costs. Polycrystalline diamond compact (PDC) bits with optimized tungsten-carbide cutter geometry provide an effective solution for improving drilling performance in high-angle and extended-reach wells. This study investigates the influence of cutter design parameters, including back rake angle, side rake angle, variable rake configurations, and shaped cutter profiles, on mechanical specific energy (MSE), rate of penetration (ROP), torque stability, and directional controllability. The research combines laboratory single-cutter rock-cutting experiments, numerical simulations, and field-scale validation under directional drilling conditions. Results demonstrate that reducing the back rake angle from conventional values to optimized lower ranges significantly improves cutting efficiency by enhancing shearing mechanisms and reducing energy dissipation. Variable-rake cutter arrangements additionally improve toolface control and decrease torque fluctuations, mitigating stick?slip vibrations and enhancing directional stability. Field applications confirm substantial operational benefits, including increased ROP in directional sections and extended bit life when optimized cutter geometry is combined with tailored drilling-fluid rheology and improved hydraulic cleaning performance. The findings indicate that balanced cutter designs, particularly moderate back rake angles combined with chamfered cutters, provide the optimal compromise between aggressiveness, durability, and stability in complex directional drilling environments.
Publication details
References20
B. Ratov, M. Rucki, B. Fedorov, E. Hevorkian, Z. Siemiatkowski, S. Muratova, E. Omirzakova, A. Kuttybayev, V. Mechnik, N. Bondarenko, Calculations on enhancement of polycrystalline diamond bits through addition of superhard diamond-reinforced elements, Machines 11(4), 453 (2023); DOI: 10.3390/machines11040453
M. T. Biletskiy, B. T. Ratov, V. L. Khomenko, A. R. Borash, S. K. Muratova, The choice of optimal methods for the development of water wells in the conditions of the Tonirek-shin field (Kazakhstan). Naukovyi Visnyk Natsionalnoho Hirnychoho Universytetu, (1), 13-19, (2024); DOI: 10.33271/nvngu/2024-1/013
B. T. Ratov, M. O. Bondarenko, V. A. Mechnik, V. V. Strelchuk, T. A. Prikhna, V. M. Kolodnitskyi, A. S. Nikolenko, P. M. Lytvyn, I. M. Danylenko, V. E. Moshchil, E. S. Gevorkyan, A. S. Kosminov, A. R. Borash, Structure and properties of WC?Co composites with different CrB? concentrations, sintered by vacuum hot pressing, for drill bits, J. Superhard Mater. 43(5), 344 (2021); DOI: 10.3103/s1063457621050051
V. Khomenko, O. Pashchenko, B. Ratov, R. Kirin, S. Svitlychnyi, A. Moskalenko, Optimization of the technology of hoisting operations when drilling oil and gas wells, IOP Conf. Ser.: Earth Environ. Sci. 1348(1), 012008 (2024); DOI: 10.1088/1755-1315/1348/1/012008
B. T. Ratov, V. A. Mechnik, N. A. Bondarenko, V. M. Kolodnitskyi, N. O. Kuzin, E. S. Gevorkyan, V. A. Chishkala, Effect of vanadium nitride additive on the structure and strength characteristics of diamond-containing composites based on the Fe?Cu?Ni?Sn matrix, formed by cold pressing followed by vacuum hot pressing, J. Superhard Mater. 43(6), 423 (2021); DOI: 10.3103/s1063457621060095
Sudakov, A., Dreus, A., Kuzin, Y., Sudakova, D., Ratov, B., & Khomenko, O. (2019). A thermomechanical technology of borehole wall isolation using a thermoplastic composite material. E3S Web of Conferences, 109, 00098. DOI: 10.1051/e3sconf/201910900098
F. Rakhmangulov, S. Aliyev, Innovative strategies for push-the-bit drilling automation: mitigating vibrations and maximizing steering efficiency in challenging Norwegian Continental Shelf formations and large hole sizes, in International Petroleum Technology Conference (IPTC, 2025); DOI: 10.2523/iptc-25097-ms
H. Geng, B. Zhang, Y. Xie, Rotary steerable drilling technology: bottlenecks breakthroughs and intelligent trends in China shale gas development, Processes 13(11), 3471 (2025); DOI: 10.3390/pr13113471
B. R. Borash, M. T. Biletskiy, V. L. Khomenko, Ye. A. Koroviaka, B. T. Ratov, Optimization of technological parameters of airlift operation when drilling water wells, Naukovyi Visnyk Natsionalnoho Hirnychoho Universytetu (3), 25 (2023); DOI: 10.33271/nvngu/2023-3/025
B. Fedorov, B. Ratov, A. Sharauova, Development of the model of petroleum well boreability with PDC bore bits for Uzen oilfield (The Republic of Kazakhstan), East.-Eur. J. Enterp. Technol. 3(1(87)), 16 (2017); DOI: 10.15587/1729-4061.2017.99032
A. T. Zholbassarova, R. Y. Bayamirova, B. T. Ratov, V. L. Khomenko, A. R. Togasheva, M. D. Sarbopeyeva, M. T. Tabylganov, D. S. Saduakasov, A. G. Gusmanova, Ye. A. Koroviaka, Development of technology for intensification of oil production using emulsion based on natural gasoline and solutions of nitrite compounds, SOCAR Proceedings, 2, 48?55, (2024); DOI: 10.5510/OGP20240200965
B. T. Ratov, V. A. Mechnik, N. A. Bondarenko, V. N. Kolodnitsky, V. L. Khomenko, P. S. Sundetova, D. L. Korostyshevsky, R. U. Bayamirova, A. T. Makyzhanova, Increasing the durability of an impregnated diamond core bit for drilling hard rocks. SOCAR Proceedings, 1, 24?31, (2024). DOI: 10.5510/OGP20240100936
Kh. A. Yussupov, S. V. Mikhalovsky, M. Khalid, A. Omarov, S., Azat, A. A. Akzholova, Research of influence of various factors on repair-and-renewal operations in technological wells during uranium geotechnology in complex mining and geological conditions, Mining Miner. Depos. 19(1), 132 (2025); DOI: 10.33271/mining19.01.132
O. Ishchenko, L. Novikov, I. Ponomarenko, V. Konoval, R. Kinasz, K. Ishchenko, Influence of a compensatory well diameter on the efficiency of cut cavity shaping in hard rock formations, Mining Miner. Depos. 19(1), 13 (2025); DOI: 10.33271/mining19.01.013
B. T. Ratov, V. A. Mechnik, M. Rucki, E. S. Gevorkyan, N. A. Bondarenko, V. M. Kolodnitskyi, V. A. Chishkala, G. A. Kudaikulova, A. B. Muzaparova, D. L. Korostyshevskyi, Diamond?(WC?Co)?ZrO? composite materials with improved mechanical and adhesive properties, J. Superhard Mater. 45(2), 103 (2023); DOI: 10.3103/s1063457623020107
O. Pashchenko, B. Ratov, V. Khomenko, A. Gusmanova, E. Omirzakova, Methodology for optimizing drill bit performance, in International Multidisciplinary Scientific GeoConference Surveying Geology and Mining Ecology Management, SGEM 24(1.1), 623 (2024); DOI: 10.5593/sgem2024/1.1/s06.78
Biletskiy, M. T., Ratov, B. T., Kozhevnykov, A. Ђ., Baiboz, A. R., & Delikesheva D. N. (2018). Updating the theoretic model of rock destruction in the course of drilling. News of the National Academy of Sciences of the Republic of Kazakhstan, 2(428), 63 ? 71. ISSN 2224-5278
D. Chepiga, S. Podkopaiev, V. Gogo, O. Shashenko, O. Skobenko, O. Demchenko, Y. Podkopayev, Dualistic effect of the deformation of protective structures made of broken rock in mine workings under static load, Mining Miner. Depos. 18(2), 122 (2024); DOI: 10.33271/mining18.02.122
B. T. Ratov, B. V. Fedorov, A. Kh. Syzdykov, S. T. Zakenov, A. K. Sudakov, The main directions of modernization of rock-destroying tools for drilling solid mineral resources. International Multidisciplinary Scientific GeoConference Surveying Geology and Mining Ecology Management, SGEM, 21(1.1), 335?346, (2021); DOI: 10.5593/sgem2021/1.1/s03.062
B. T. Ratov, V. L. Khomenko, A. E. Kuttybayev, K. S. Togizov, Z. G. Utepov, Innovative drill bit to improve the efficiency of drilling operations at uranium deposits in Kazakhstan. News of the National Academy of Sciences of the Republic of Kazakhstan, Series of Geology and Technical Sciences, 4 (465), 224?236, (2024); DOI: 10.32014/2024.2518-170X.437