Wear-resistant and anti-corrosion sucker rod connectors, tubing connectors

Abstract

The invention discloses an abrasion-resisting and corrosion preventing sucker rod connector and an oil pipe connector, relates to an oil field oil pumping tools, and aims at providing the abrasion-resisting and corrosion preventing sucker rod connector and the oil pipe connector which are small in strain difference of a coating and a base body under the alternating load, and therefore the coating is effectively prevented from cracking or disengaging from the base body. According to the abrasion-resisting and corrosion preventing sucker rod connector, the surface of the base body of the sucker rod connector is coated with the coating, and the coating comprises, by mass percent, 0.03%-0.05% of C, 3.6%-8% of Cr, 1.0%-3.5% of Mn, 0.5%-4.3% of Ni, 2.5%-6.7% of Mo, 0.5%-2.0% of Cu, 1.5%-8.6% of W, 3.5%-7.3% of V, 0.05%-0.07% of Nb, 0.1%-0.2% of Ti and the balance Fe.

Description

Technical field [0001] The invention relates to an oil field pumping tool, in particular to a connector. Background technique [0002] Pumping wells have always been the main oil production method in domestic and foreign oil fields. With the current increasing number of deep wells, ultra-deep wells, heavy oil wells, corrosive wells and high water-cut wells, the working conditions in oil wells are becoming increasingly harsh and the corrosion contained in crude oil With more and more sexual media, the corrosion damage to the tubing string and sucker rod string is getting more and more serious. The tubing coupling that connects the tubing and the sucker rod coupling that are connected to the sucker rod often fail due to damage to the threads due to corrosion. In severe cases, the tubing string and the sucker rod are disconnected and the well is stopped. [0003] At the same time, because the sucker rod coupling has a larger outer diameter than the sucker rod, it often touches the in...

AI Technical Summary

Problems solved by technology

However, since these thermal sprayed alloy coatings are mainly composed of nickel-based alloy powder, their material ratio is quite different from that of the base steel, which causes the gap between the coating and the base when the workpiece is under alternating loads in the well. The strain difference is large. After a long time of use, the coating is prone to cracks or falls off from the substrate, resulting in failure of the wear-resistant and anti-corrosion effect.

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