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Purpose: This study aims to solve the premature failure of the rubber stator due to wear, reduce the frictional resistance moment of the screw pump to solve the problem of a model of Daqing oilfield screw pump oil recovery system shutdown after the difficult start. Design/methodology/approach: For the first time, the rotor surface of a screw pump was treated with dot-matrix texture to study the effect of dot matrix texture on the tribological performance of the stator-rotor friction subsets of screw pump. Reciprocating friction tests with different texture morphologies (S-shape, double tongue) and angular parameters (0°, 45° and 90°) were conducted at 10% of the texture area and pump silicone grease. Findings: When point texture was added to the surface of the rotor sample, the friction coefficient and wear quantity of the sample were lower than those of the surface without texture treatment, and the double tongue 0° combination showed the best tribological properties. At this time, the average coefficient of friction and wear is reduced by 22.8% and 62%, 28.6% and 64.8%. Originality/value: The introduction of texture can effectively improve the tribological performance of progressive screw pumps, and this paper provides important theoretical and experimental support for the design of progressive screw pumps in practical applications. [ABSTRACT FROM AUTHOR]

Due to the complexity of shale gas development formations, high-speed reciprocating compressors must be able to operate in harsh pressurization conditions, such as multiwall operation conditions and changing well conditions, resulting in high shaft system impact loads and poor cooperative matching of the rotation speed, which can easily cause shaft system torsional vibration and significantly reduce the performance and operational safety of shale gas compressors. The vibration test results of the shaft system at the Weiyuan site show that there were 3rd- and 7th-order torsional vibration phenomena in the shaft system. For this reason, in this study, the shaft system of a shale gas compressor at the Weiyuan site was used as the research object, a dynamic model of the shaft system under full-cycle alternating loads was established, and the correctness of the model was verified by the shaft system field vibration test Finally, an optimization study of the shaft system structure based on the response surface method was conducted, and the results show that the optimized shaft system increased the 1st-order natural frequency by 4.5% and reduced the peak velocity of the coupling in the vertical direction by 27.7%, improving the service life and operating reliability of the shaft system. [ABSTRACT FROM AUTHOR]