Gear oil for oil pumping unit in oilfield and preparation method thereof

Abstract

The invention provides a gear oil for an oil pumping unit in an oilfield and a preparation method thereof. The gear oil is prepared from the following components in parts by mass: 8.0% to 11.0% of 500N basic oil, 75.0% to 85.0% of PAO40 basic oil, 5.0% to 10.0% of alkyl naphthalene basic oil, 1.0% to 3.0% of composite agent, 0.5% to 0.8% of antioxidant, 0.1% to 0.4% of pour point depressant, 0.1%to 0.4% of anti-emulsifier, and 0.01% to 0.02% of defoamer. The gear oil has the advantages that by adopting the pulse combination, the components can be more uniformly mixed; the basic oil adopts thesynthetic oil, so that the pour point of the gear oil is lower than -39 DEG C; because the self viscosity of the synthetic oil is higher, the problem of decreasing of viscosity of the gear oil due toshearing function is solved, and the anti-shearing function is realized.

Description

technical field [0001] The invention belongs to the field of industrial lubricating oil, and relates to a low-pour-point micro-shear gear oil for oil field pumping units and a preparation method thereof. Background technique [0002] With the rapid economic growth, the demand for crude oil is also increasing steadily, a large number of new oil fields are emerging, the number of pumping units is increasing, and the quality is constantly improving. Therefore, the gear oil of pumping units The consumption is also increasing steadily year by year, and at the same time, more stringent requirements are put forward for the quality of the gear oil of the pumping unit. [0003] Some oil fields are distributed in cold regions, where the average temperature in winter is more than 20 degrees below zero, and the lowest temperature can reach minus 40 degrees below zero. Since most of the current gear oils use Class I or Class II bright oil as the main ingredient, the oil products are most...

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Problems solved by technology

[0003] Some oil fields are distributed in cold regions, where the average temperature in winter is more than 20 degrees below zero, and the lowest temperature can reach minus 40 degrees below zero. Since most of the current gear oils use Class I or Class II bright oil as the main ingredient, the oil products are mostly The point is high, and it becomes solid at low temperature, resulting in poor lubrication, which can easily cause tooth surface scratches and affect the life of the gear of the pumping unit

[0004] The gear of the pumping unit has a considerable load-bearing capacity on the tooth surface during operation, which requires a high oil film strength of the gear oil, so the oil must have sufficient viscosity to support it, but the existing viscosity index improver is used to improve The viscosity of the oil, but the viscosity index improver will cause the molecular chain to break under the action of shearing, which is manifested in the decrease of the viscosity of the oil and the decrease of the strength of the oil film on the oil, resulting in local abrasion damage

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