Laser-cladding coating preparation process of corrosion-resistant, sulfur-resistant and wear-resistant tubing coupling

Abstract

The invention discloses a laser-cladding coating preparation process of a corrosion-resistant, sulfur-resistant and wear-resistant tubing coupling. A 5000 W cross-flow CO2 laser is used; a working platform is a numerical control laser machine; a coaxial or paraxial powder feeding device is used for automatically feeding nickel-based alloy powder into a laser molten pool; and a corrosion-resistant, sulfur-resistant and wear-resistant laser-cladding coating with uniformity and compactness is formed on a processing surface, and is 3-6 mm thick. A laser surface cladding process is adopted; in the cladding process, a heat-affected zone is small, and no influence is generated on the strength of the coupling; and nickel-based alloy with good corrosion resistance and high strength is adopted, so that the coupling obtains excellent corrosion resistance and wear resistance while the strength of the coupling is guaranteed. The preparation process intensifies the corrosion resistance, sulfur resistance and wear resistance of the tubing coupling, prolongs the service life of the tubing coupling, and solves a difficulty unsolved for a long time in the corrosion-resistant application field of an oil tube and the tubing coupling in the oil exploitation and the production operation and maintenance of oil, gas and water wells in our country.

Description

technical field

[0001] The invention relates to the field of laser cladding, in particular to a preparation process for a laser cladding coating of an anti-corrosion, anti-sulfur and wear-resistant oil pipe coupling. Background technique

[0002] In the process of oil and gas field development, various oil pipes used are in oxygen, hydrogen sulfide and carbon dioxide. In a dynamic environment, metal pipes are prone to electrochemical corrosion or various types of corrosion due to the interaction of mechanical force and hydraulic force. In the corrosion of oil wells, the internal corrosion of tubing couplings is particularly serious, especially in the middle and later stages of crude oil production in most domestic oil fields, oil wells, oil-gas mixing wells, and water injection wells contain CO 2 、H 2 Various components such as S corrode the medium, gas, high temperature, high salinity, and the well environment is relatively harsh, and the degree of corrosion continues to ...