Kazakhstan journal for oil & gas industry

2707-42262957-806X

KMG Engineering

108959

10.54859/kjogi108959

Research Article

Stability analysis of bottom-hole drilling bits utilizing an advanced reamer-stabilizer configuration

Abishev

Murat N.

Cand. Sc. (Engineering), Associate Professorm_abishev_nik@mail.ruhttps://orcid.org/0009-0001-5793-3800Zhanturin

Zhomart K.

Cand. Sc. (Engineering), Associate Professoraing-zhomart@mail.ruhttps://orcid.org/0009-0007-4944-1850Akhmetov

Nurken M.

D. Sc. (Engineering), Professorn.akhmetov@aogu.edu.kzhttps://orcid.org/0009-0008-5892-2530

Atyrau Oil and Gas University named after S. Utebaev

30062026

82815

06032026

09042026

2026

Background: During deep drilling of oil and gas wells, the dynamic instability of the drill string caused by radial and axial vibrations of the drill bit leads to a reduction in the rate of penetration (ROP), increased tool wear, and deterioration of the wellbore gauge. This problem becomes particularly pronounced when drilling formations with alternating lithology and rock strength. An analysis of existing technical solutions, including the roller-cone reamer–stabilizer design described in the Patent of the Republic of Kazakhstan No. 22228 (E21B 10/30), has demonstratedthe need to improve the geometric and dynamic parameters of stabilizing devices intended to ensure stable dynamic equilibrium of the “bit–drill string–rock formation” system. Aim: The objective of this study is to provide theoretical and experimental justification for the causes of radial vibrations of the drilling system and to develop a near-bit roller-cone reamer–stabilizer capable of ensuring the stability of the bottom-hole assembly (BHA) at the well bottom. The stability is achieved through the efficient arrangement of the working elements at an angle of 120° and by meeting the conditions meeting the conditions for the formation of the roller cones based on their minimum size. Materials and methods: The study is based on the principles of dynamic systems theory, the laws governing energy dissipation in rotational mechanical systems, and the principle of least action. A mathematical model was developed to establish the relationship of the minimum size of the roller-cone forming elements on the nominal radius of the reamer–stabilizer. The geometric parameters of an experimental prototype of a near-bit stabilizer with a diameter of 269.9 mm, manufactured on the basis from a 203 mm heavy-weight drill pipe (HWDP), were analytically substantiated. Experimental studies were carried out under field conditions during deep drilling operations. Results: It was established that meeting the structural condition<math xmlns="http://www.w3.org/1998/Math/MathML"><msub><mi>b</mi><mi>min</mi></msub><mo></mo><mfrac><mrow><msqrt><mn>7</mn></msqrt><mo>⋅</mo><msub><mi>R</mi><mrow><mi>P</mi><mi>A</mi><mi>C</mi></mrow></msub></mrow><mn>2</mn></mfrac></math> ensures stable dynamic equilibrium of the drilling tool relative to the wellbore axis. Field tests demonstrated a 5% increase in ROP and a 7.3% increase in bit run length. A reduction in bit balling and clogging was also observed, indicating improved hydrodynamic bottom-hole cleaning. Conclusion: The developed design of the near-bit roller-cone reamer–stabilizer validates the theoretical provisionsregarding the nature of radial vibrations in drilling dynamic systems and ensures an increase in the efficiencyof deep oil and gas well drilling. The obtained results demonstrate the feasibility of industrial implementation of the proposed technical solution and its effectiveness for application in the design of bottom-hole assembly (BHA) configurations.

drill bitradial vibrationsreamer–stabilizerdynamic stabilityrate of penetrationfootage

бұрғы қашауырадиалды тербелістертұрақтандырғыш-кеңейткішдинамикалық тұрақтылықбұрғылаудың механикалық жылдамдығыбұрғылау көлемі

буровое долоторадиальные колебаниястабилизатор-расширительдинамическая устойчивостьмеханическая скорость буренияпроходка

Deng P, Tan X, Li H. Influence of Blades Shape and Cutters Arrangement of PDC Drill Bit on Nonlinear Vibration of Deep Drilling System. Journal of Sound and Vibration. 2024;572:118165. doi: 10.1016/j.jsv.2023.118165.

Zhang J, Cui M, Wang Q, et al. Experimental Study on Rock Drilling Vibration of PDC Bit in Interbedded Formations. Geoenergy Science and Engineering. 2025;244:213452. doi: 10.1016/j.geoen.2024.213452.

Paliy PA, Korneyev KY. Burovyye dolota. Spravochnik. Moscow : Nedra; 1971. 488 p.

Patent USSR №595481/ 1978. Byul. №8. Chumakov ND, Kudekov YF, Skornyakov YM. Sharochnyy rasshiritel’-stabilizator. (In Russ).

Steklyanov BL, Torgashov AV, Loginov AA, et al. Povysheniye effektivnosti burovogo porodorazrushayushchego instrumenta. Moscow: TSINTICHIMNEFTEMASH; 1991. (In Russ).

Patent KAZ №(19)KZ(13)B(11)22228/ 15.01.10. Byul. №1. Abishev MN, Steklyanov BL, Dzhanzakov II, Baymirov MY. Sharoshechnyy rasshiritel’-stabilizator. Available from: kz.patents.su/3-22228-sharoshechnyjj-rasshiritel-stabilizator.html. (In Russ).

Akhmetov NM, Abishev MN. Razrabotka konstruktsii naddolotnogo rasshiritelya-stabilizatora. Sbornik nauchnykh trudov mezhdunarodnoy nauchno-prakticheskoy konferentsii «Problemy nauchno-tehnicheskogo i kadrovogo obespecheniya neftegazovoy promyshlennosti Kazakhstana». Atyrau: AING; 2008. P. 273–280. (In Russ).

Girfanova NI, Shchevelev AA, Levinson LM, Yangirov FN. Classification of supporting-centering elements and their appointment in the drilling column. Problems of Gathering, Treatment and Transportation of Oil and Oil Products. 2019:3(119):35–46. doi: 10.17122/ntj-oil-2019-3-35-46. (In Russ).

Serikov DY. Sovershenstvovaniye konstruktsii sharoshechnogo rasshiritelya-kalibratora. SFERA. Neft’ I gaz. 2023;5:76–78. Available from: xn--80aaigboe2bzaiqsf7i.xn--p1ai/upload/articles/pdf/sphereoilandgas_2023-5_gubkin1.pdf. (In Russ).

10.

drillingmanual.com [Internet]. Каталог технических решений Halliburton Drill Bits & Services [cited 2026 Feb 06]. Available from: www.drillingmanual.com/wp-content/uploads/2022/11/291267040-Halliburton-drill-bits-and-services-Catalog-pdf.pdf.