Abrasion-resisting and corrosion preventing sucker rod connector and oil pipe connector

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 present invention relates to an oil field oil pumping tool, in particular to a connector. Background technique [0002] Pumping wells have always been the main method of oil production in oilfields at home and abroad. With the increasing number of deep wells, ultra-deep wells, heavy oil wells, corrosion wells and high water content wells, the working conditions in oil wells are becoming increasingly harsh, and the corrosion contained in crude oil There are more and more aggressive media, and the corrosion damage to tubing strings and sucker rod strings is becoming more and more serious. The tubing coupling used to connect the tubing and the sucker rod coupling connected to the sucker rod often fail due to thread damage caused by corrosion. In severe cases, the tubing string and sucker rod string are broken off and the well is shut down. [0003] At the same time, because the outer diameter of the sucker rod coupling is larger than that of the suck...

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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