Investigation of the Strength Parameters of Drilling Pumps during the Formation of Contact Stresses in Gears

Vitaliy Vladimirovich Savinkin,Sergey Nikolayevich Kolisnichenko,Zaure Zhetpysbayevna Zhumekenova,Andrei Victor Sandu,Petrica Vizureanu,Olga Vladimirovna Ivanova

doi:10.3390/app11157076

Abstract

The relevance of this research lies in the need to develop scientifically based methods for calculating and designing a transmission shaft with a hardened coating of increased strength and service life of a core drilling pump drive that can allow for a redistributing of resistance forces along the contact surfaces of the gear. This relevance is confirmed by the need to improve domestic methods for designing drive shafts of increased reliability which can ensure the development of frozen soils during deposits exploration. The purpose of the research is to increase the energy efficiency and service life of the high-loaded drive gear teeth of core drilling pump transmission shafts by justifying the critical loads and stresses in hardened gear coatings acting under intense wear of the contact surface with a broken contact symmetry. The criteria for the effective wear area with an uneven contact cross-section at the maximum bending moments of the transmission shaft of the drilling pump were justified and presented in the work. Additionally, the process of interaction of the transmission shaft gear teeth with the eccentric shaft gear at uneven axial torques was investigated. The effective power (Ng) of the gearing of the drive transmission shaft gear and the eccentric shaft gear, which characterizes the energy consumption of the drill bit depth stroke, was justified. This work also proposes a method of substantiating the technological and power parameters of the transmission shaft by using Legendre polynomials. A nomographic chart was developed for the determination of the dependence of the contact stress base cycles on the change in the load distribution factor and the contact spot deviation factor from the design axis λ.

Highlights

In modern mining and exploration drilling units, one of the most important installation units is the mud pumping unit (MPU).The energy intensity of the drilling process significantly depends on the efficient operation of the transmission shaft of the pump, which is accompanied by large dynamic loads [1,2,3]
Sagar in the field of service life of drilling rigs (DR) show that the factors are insufficiently substantiated and a causal relationship has not been fully established between the failure of the main pump assemblies of drilling rigs with dynamic processes occurring in the structural elements of the gearing of the transmission shaft gear [4,5]
With an increase in the wear asymmetry in the contact spot, the energy intensity of the drilling process increases, which means that the equation describing the gear power in the gearing and the distribution of the bending moment will be as follows (58):

Summary

Introduction

The energy intensity of the drilling process significantly depends on the efficient operation of the transmission (drive) shaft of the pump, which is accompanied by large dynamic loads [1,2,3]. The energy efficiency of the pump operation largely depends on the dynamic, power, and energy characteristics of the transmission shaft, the kinematics of the gear and the design features of the drive. Studying the design and technological features of the pumping and the drilling unit, it was found that there are frequent failures along with its high margin of safety that can be associated with a sharp decrease in the supply pressure, Ps, and, as a result, in productivity Its technical condition and maximum permissible life indicators ensure the performance of technological operations that determine the efficiency and energy intensity of the well drilling process [3,4].

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Discussion

Conclusion