Mechanical Engineering, General Engineering, Mechanical Engineering, Industrial and Manufacturing Engineering
6
Scopus Publications
Scopus Publications
Reliability-Oriented Modeling of Bellows Compensators: A Comparative PDE-Based Study Using Finite Difference and Finite Element Methods Yerzhan Y. Sarybayev, Doszhan Y. Balgayev, Denis Y. Tkachenko, Nikita V. Martyushev, Boris V. Malozyomov, et al. Mathematics, 2025 Bellows compensators are critical components in pipeline systems, designed to absorb thermal expansions, vibrations, and pressure reflections. Ensuring their operational reliability requires accurate prediction of the stress–strain state (SSS) and stability under internal pressure. This study presents a comprehensive mathematical model for analyzing corrugated bellows compensators, formulated as a boundary value problem for a system of partial differential equations (PDEs) within the Kirchhoff–Love shell theory framework. Two numerical approaches are developed and compared: a finite difference method (FDM) applied to a reduced axisymmetric formulation to ordinary differential equations (ODEs) and a finite element method (FEM) for the full variational formulation. The FDM scheme utilizes a second-order implicit symmetric approximation, ensuring stability and efficiency for axisymmetric geometries. The FEM model, implemented in Ansys 2020 R2, provides high fidelity for complex geometries and boundary conditions. Convergence analysis confirms second-order spatial accuracy for both methods. Numerical experiments determine critical pressures based on the von Mises yield criterion and linearized buckling analysis, revealing the influence of geometric parameters (wall thickness, number of convolutions) on failure mechanisms. The results demonstrate that local buckling can occur at lower pressures than that of global buckling for thin-walled bellows with multiple convolutions, which is critical for structural reliability assessment. The proposed combined approach (FDM for rapid preliminary design and FEM for final verification) offers a robust and efficient methodology for bellows design, enhancing reliability and reducing development time. The work highlights the importance of integrating rigorous PDE-based modeling with modern numerical techniques for solving complex engineering problems with a focus on structural integrity and long-term performance.
Design Optimization of Valve Assemblies in Downhole Rod Pumps to Enhance Operational Reliability in Oil Production Seitzhan Zaurbekov, Kadyrzhan Zaurbekov, Doszhan Balgayev, Galina Boiko, Ertis Aksholakov, et al. Energies, 2025 This study focuses on the optimization of valve assemblies in downhole rod pumping units (DRPUs), which remain the predominant artificial lift technology in oil production worldwide. The research addresses the critical issue of premature failures in DRPUs caused by leakage in valve pairs, i.e., a problem that accounts for approximately 15% of all failures, as identified in a statistical analysis of the 2022 operational data from the Uzen oilfield in Kazakhstan. The leakage is primarily attributed to the accumulation of mechanical impurities and paraffin deposits between the valve ball and seat, leading to concentrated surface wear and compromised sealing. To mitigate this issue, a novel valve assembly design was developed featuring a flow turbulizer positioned beneath the valve seat. The turbulizer generates controlled vortex motion in the fluid flow, which increases the rotational frequency of the valve ball during operation. This motion promotes more uniform wear across the contact surfaces and reduces the risk of localized degradation. The turbulizers were manufactured using additive FDM technology, and several design variants were tested in a full-scale laboratory setup simulating downhole conditions. Experimental results revealed that the most effective configuration was a spiral plate turbulizer with a 7.5 mm width, installed without axis deviation from the vertical, which achieved the highest ball rotation frequency and enhanced lapping effect between the ball and the seat. Subsequent field trials using valves with duralumin-based turbulizers demonstrated increased operational lifespans compared to standard valves, confirming the viability of the proposed solution. However, cases of abrasive wear were observed under conditions of high mechanical impurity concentration, indicating the need for more durable materials. To address this, the study recommends transitioning to 316 L stainless steel for turbulizer fabrication due to its superior tensile strength, corrosion resistance, and wear resistance. Implementing this design improvement can significantly reduce maintenance intervals, improve pump reliability, and lower operating costs in mature oilfields with high water cut and solid content. The findings of this research contribute to the broader efforts in petroleum engineering to enhance the longevity and performance of artificial lift systems through targeted mechanical design improvements and material innovation.
Improving energy efficiency and reliability of starting rotary equipment at mining enterprises using pneumatic auxiliary drives K.I. Satbayev Kazakh National Research Technical University, Yerzhan Sarybayev, Bauyirzhan Beisenov, K.I. Satbayev Kazakh National Research Technical University, Doszhan Balgayev, et al. Sustainable Development of Mountain Territories, 2025 Introduction. In the mining industry, the safe and stable start-up of technological machines with heavy rotors, such as drum mills, is a critical factor for enhancing reliability and reducing operating costs. High inrush currents during start-up can lead to motor failures, overloads of drive components, and increased wear. This study addresses these challenges by proposing an auxiliary pneumatic drive system that optimizes start-up modes, lowers inrush currents, and improves the overall energy efficiency of heavy rotor equipment. Methods. A rack-type auxiliary start-up device (AUSD) was designed based on three-chamber bellows pneumatic actuators with an extension stroke of 280–320 mm and operating pressure of 0.35 0.40 MPa. A test stand was developed to evaluate the effect of actuator stroke length, pressure, and limit switch positioning on dynamic system characteristics. Experimental procedures included systematic variation of pressure (0.1–0.4 MPa) and stroke length (270–350 mm), as well as the use of a receiver to investigate booster (explosive) compressed air supply. Measurements of start-up currents, pushing forces, and pressure oscillograms were recorded to assess system performance. Results. The experiments showed that optimal reduction of starting current occurs when the actuator stroke is within 290–310 mm, with the most favorable range being 300–320 mm. The use of booster compressed air supply significantly increased pushing force nearly doubling it compared to standard pneumatic feed–and reduced inrush currents to nominal levels. These findings demonstrate that the device effectively decreases peak loads on main drive elements, prolongs equipment lifespan, and enhances energy efficiency. Conclusions. The proposed pneumatic auxiliary drive offers a simple yet effective solution for improving the start-up of heavy rotor equipment. Its design allows for application in remote mining areas, even in the absence of stationary pneumatic mains. By optimizing stroke length, pressure, and air supply mode, the system can significantly reduce inrush currents, ensure stable operation, and contribute to the sustainable functioning of mining enterprises.
MULTIFUNCTIONAL VALVE FOR THE ARRANGEMENT OF SUBMERSIBLE DOWNHOLE PUMPS IN DOWNHOLE OIL PRODUCTION B.А. Myrzakhmetov, T.A. Kuandykov, B.K. Mauletbekova, D.Y. Balgayev, J.B. Nurkas News of the National Academy of Sciences of the Republic of Kazakhstan Series of Geology and Technical Sciences, 2024 The quality and depth of content Web of Science offers to researchers, authors, publishers, and institutions sets it apart from other research databases. The inclusion of News of NAS RK. Series of geology and technical sciences in the Emerging SourcesCitation Index demonstrates our dedication to providing the most relevant and influential content of geology and engineering sciences to our community.
HYDRODYNAMIC SIMULATION OF THE STEAM-ASSISTED GRAVITY DRAINAGE METHOD FOR DIFFERENT RESERVOIR THICKNESSES USING ECLIPSE K.S. Zaurbekov, S.A. Zaurebkov, A.V. Sladkovsky, D.Y. Balgayev News of the National Academy of Sciences of the Republic of Kazakhstan Series of Geology and Technical Sciences, 2023 The quality and depth of content Web of Science offers to researchers, authors, publishers, and institutions sets it apart from other research databases.The inclusion of News of NAS RK.Series of geology and technical sciences in the Emerging Sources Citation Index demonstrates our dedication to providing the most relevant and influential content of geology and engineering sciences to our community. . Web of Science
