Preparation method of NiCrBSiMnWC abrasive-wear-resistant sucker rod

Abstract

The invention discloses a preparation method of a NiCrBSiMnWC abrasive-wear-resistant sucker rod. The preparation method comprises the steps of (1) carrying out surface treatment on the sucker rod to remove oxide scales, grease and dirt; (2) roughening the sucker rod subjected to surface treatment by carrying out sand blasting, wherein the roughness is larger than Ra25; (3) uniformly mixing NiCrBSiMn powder and WC powder according to the weight ratio of (4-10):1 to form mixed powder; (4) carrying out hypersonic flame spraying on the surface of the sucker rod roughened by sand blasting by taking propane as fuel, high-pressure oxygen as a combustion-supporting gas and nitrogen as a powder supply gas to obtain the abrasive-wear-resistant sucker rod, wherein during spraying, the propane has the pressure of 0.55-0.7 MPa and the flow of 20-30 L / min, the oxygen has the pressure of 0.65-0.7 MPa and the flow of 180-200 L / min, and the nitrogen has the pressure of 0.85-1 MPa and the flow of 18-30 L / min, and the spraying thickness is 700-800 mu m. The microhardness of a coating obtained by using the preparation method is 920-1130 HV0.2 which is far higher than that of a matrix, so that the abrasive wear resistance of the NiCrBSiMnWC abrasive-wear-resistant sucker rod is improved.

Description

technical field [0001] The invention relates to the field of material technology, in particular to a method for preparing a NiCrBSiMnWC corrosion-resistant sucker rod. Background technique [0002] After years of development in the oil field, it has now reached the middle and late stages. With the increase of water content in oil wells, the proportion of oil well maintenance workload caused by abrasion has increased significantly, and there is a gradual upward trend. Abrasion is a general term for the interaction between wear and corrosion. The problem of eccentric wear of sucker rods is essentially a problem of abrasion. The early scrapping of the sucker rod due to the abrasion of the oil well causes a sharp increase in the input of manpower and material resources, resulting in serious waste. [0003] At present, the development of oil fields has entered a period of high water cut. The water content of some oil fields is as high as 94.5%. The well fluid contains corrosive ...

AI Technical Summary

Problems solved by technology

The combination of corrosion and wear is more harmful than simple corrosion or wear, because wear will remove the corrosion layer on the surface of the equipment that acts as a corrosion inhibitor, thereby accelerating the wear of the corrosion surface, causing equipment failure or even shutdown, and reducing oil well production

In recent years, due to the increase of water content in the well fluid, in order to stabilize the crude oil production, it is necessary to increase the number of pump strokes, which further aggravates the wear of the sucker rod