Study on speed characteristics of hydraulic top drive under fluctuating load

Sun, Youhong; Shi, Yuanling; Wang, Qingyan; Yao, Zongwei

doi:10.1016/j.petrol.2018.04.003

Cited by 11 publications

(3 citation statements)

References 21 publications

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“…The previous description in this article indicates that the external load of the HTDS is complicated and can be decomposed into three parts: 29 axial gravity of drill strings, lateral load, and torque around the rotating shaft. The gravity of the drill strings and lateral load were loaded into the load sharing simulation model as constants.…”

Section: Simulation Modelsmentioning

confidence: 99%

Load sharing characteristic of a power-integrated gearbox in a hydraulic top-drive system

Sun

Shi

Yao

et al. 2019

Proceedings of the Institution of Mechanical Engineers, Part C:

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With the increase in drilling depth, a slight conical pendulum movement of drilling strings causes the external drilling load becoming a non-negligible excitation source. The phenomenon of unique load sharing would be generated by irregular external load, which has complex influence on cyclic and axial symmetry of a power integrated gearbox. Bearing wear, which brings high frequency unpredictable vibration into the transmission system, is likely to occur because of the specific drive mode of the hydraulic top-drive system applied in well drilling. A systematic model combining the finite element method and the multi-body dynamics of a power-integrated gearbox simulation system is developed in this study with the characteristics of the power system, external load, driving forces, gear mesh stiffness, and bearing support stiffness taken into consideration. The load sharing characteristics of the power-integrated gearbox in a hydraulic top-drive system are numerically investigated. Moreover, the effects of gear mesh stiffness, bearing support stiffness, lateral load, and bearing clearance on the load sharing characteristics are systematically examined. Analysis results show that the dynamic process must be considered to achieve a comprehensive evaluation of the load sharing characteristics of a power-integrated gearbox. Evaluation results indicate that lateral load is the factor that influence the load sharing factor of the power-integrated gearbox most significantly, based on which, predictions can be safely made so that some additional mechanisms might be a practical option to diminish that effect.

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Section: Simulation Modelsmentioning

confidence: 99%

Load sharing characteristic of a power-integrated gearbox in a hydraulic top-drive system

Sun

Shi

Yao

et al. 2019

Proceedings of the Institution of Mechanical Engineers, Part C:

Self Cite

View full text Add to dashboard Cite

show abstract

“…Vaezi et al [17] investigated the nonlinear characteristics of electromagnetic proportional valves in wind turbine drive systems over a wide range of operating voltages, and, based on a segmented affine system, segmentation and parameter identification of the system were carried out in conjunction with experiments. Sun et al [18] assessed the impact of random fluctuating loads on the output speed of hydraulic top drives in oil hydraulic drilling rigs, achieving stable control of the system output speed through electrohydraulic proportional control. Although the above literature well explains the mechanism of the flow loss of the system or hydraulic components, it does not propose a method for evaluating the speed change.…”

Section: Introductionmentioning

confidence: 99%

Stability Analysis of the Output Speed in a Hydraulic System Powered by an Inverter-Fed Motor

Geng,

Jing,

Wang

et al. 2024

Lubricants

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The stability of the output speed of a hydraulic system has a great influence on the working performance of hydraulic equipment. It changes with the system working conditions. The increase in leakage caused by the wear of the hydraulic kinematic pair and the slip of the motor lead to the instability of the output speed. Although the hydraulic system can satisfy the output requirements of the active control scheme with ex ante decision making or the passive feedback control strategy with ex post compensation, it also causes an increase in system complexity and manufacturing cost. The speed stiffness as a basic characteristic of the output of the hydraulic system has not been sufficiently investigated and evaluated. In this paper, the IFMDH (inverter-fed, motor-driven hydraulic) system is taken as the object, and the coupling relationship of each link of the system is revealed by mathematical modelling. The reliability of the model is verified under a wide range of speed and load variations in combination with experiments. By redefining the speed stiffness quantification method, the effects of load conditions, motor stiffness, and speed ratio at the output end on the speed stability of the system are discussed in conjunction with the system coupling mechanism model. The conclusions show that the motor stiffness and the addition of a speed reducer have a significant effect on the system speed stiffness, where changing the output speed ratio has a significant effect on the speed stiffness. The conclusions of the study provide technical support for the rapid design, selection, and system optimisation of hydraulic systems in common scenarios.

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“…To reduce drilling costs and ancillary costs (transportation and shutdown costs, etc. ), the modular rig, as a new rig technology, plays an important role in oil exploration because of its efficient transport, economy, advanced technology, and reliability (Cao L. et al,2017;Sun Y et al,2018;Huang Z. et a.l,2018).…”

Section: Introductionmentioning

confidence: 99%

Study of fatigue characteristics of key welds of modular drilling derricks

Zhang,

Tian,

Liu

et al. 2023

CT&F Cienc. Tecnol. Futuro

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Driven by the gradual development of oil and natural gas resources, the global use of rigs and the number of wells rise steadily. Modular rigs play an important role in oil exploration because of their efficient transport, economy, technological advancement, and rig reliability. The derrick is a key part of the modular rig, and since many essential components in the derrick are welded, the fatigue life of the derrick weld is particularly relevant. In this paper, the modular rig is the object of the research, proposing the calculation formula of fatigue life of the key weld of the derrick. Using modular rig ZJ90D as an example, and combining the rig working conditions with the structural characteristics of the derrick, the key calculation parameters are obtained by numerical analysis. Thus, the life expectancy of the key weld is calculated according to the calculation formula of fatigue life presented herein. The research results have important reference significance and guiding value for the design and optimization of modular rig derricks.

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Study on speed characteristics of hydraulic top drive under fluctuating load

Cited by 11 publications

References 21 publications

Load sharing characteristic of a power-integrated gearbox in a hydraulic top-drive system

Load sharing characteristic of a power-integrated gearbox in a hydraulic top-drive system

Stability Analysis of the Output Speed in a Hydraulic System Powered by an Inverter-Fed Motor

Study of fatigue characteristics of key welds of modular drilling derricks

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