BLADE BIT DRILLING IN KAZAKHSTAN: ACHIEVED RESULTS, UNRESOLVED ISSUES
Tovbasarovich R.B. Lvovych K.V. Gabitovich U.Z. Anatoliiovych K.Y. Abiyevich S.A.
January-February 2025National Academy of Sciences of the Republic of Kazakhstan
News of the National Academy of Sciences of the Republic of Kazakhstan, Series of Geology and Technical Sciences
2025#2025 2025-January-FebruaryIssue 1182 - 201 pp.
Blade bits reinforced with carbide cutters and Polycrystalline Diamond Compact (PDC) cutters are widely used in geotechnological and oil and gas wells, including Kazakhstan. Combined drilling techniques are economically advantageous: carbide-reinforced bits are used for softer rocks, while PDC-reinforced bits handle harder formations. The efficiency of PDC bits depends on the interaction between individual cutters and the rock, making it critical to understand these patterns to improve performance and durability. This study employs system analysis of models describing cutter-rock interactions, focusing on the actual contact area and the cutter’s inclination angle. The research models the interaction area as a circle segment and incorporates a negative cutter inclination angle. Results reveal the phenomenon of bit “hanging” in formations of alternating hardness, confirmed through theoretical and experimental approaches. A bladed spud bit with no cutters in the near-axis region was developed, relying on drilling fluid or core breakers to remove rock pillars. Industrial tests showed a 10-15% increase in drilling productivity and a 1.5-fold increase in tool life. Additionally, a formula for calculating the penetration depth of a single PDC cutter was derived, enabling predictions of initial drilling speeds. These results offer practical solutions for optimizing PDC bits in challenging drilling conditions.
bladed bit , deepening , PDC cutter , well drilling , “hanging”
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Kazakh National Research Technical University named after K.I. Satpayev, Almaty, Kazakhstan
Dnipro University of Technology, Dnipro, Ukraine
Caspian State University of Technology and Engineering named after Sh. Yesenov, Aktau, Kazakhstan
Kazakh National Research Technical University named after K.I. Satpayev
Dnipro University of Technology
Caspian State University of Technology and Engineering named after Sh. Yesenov
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