Production technology of steel tube with high-elasticity heat-resistant anti-corrosion abrasion-proof nano composite material coating

Abstract

The invention discloses a production process of a steel pipe with a nanometer composite coating of high elasticity, heat resistance, corrosion and wear resistance, which comprises such procedures as sand blasting with emery the inner and outer surfaces of the steel pipe to remove the iron dust on the inner and outer walls of the steel pipe; blowing away with compressed air the floating sand and dust which passes through the inner surface of the steel pipe; preheating the steel pipe in a preheating furnace to remove water and moist on the inner wall of the pipe; spraying titanium alloy composite onto the inner surface of the preheated steel pipe to form a coating; rotating the sprayed steel pipe around a pipe axis so that the coating becomes even and smooth and the surface of the pipe is smooth and neat; then solidifying completely the coating to get a finished steel pipe. The titanium alloy composite comprises a plurality of titanium alloy nanometer powders as active additive, optimized resin and assistant. The steel pipe with the coating can be used as an oil well flow string or a refilling pipe to meet the requirements under the working condition of 2,000m to 5,000m deep well, the service life is long, and thus a large amount of steel material is saved and the production cost is reduced.

Description

technical field [0001] The invention relates to a coating and a production process of a steel pipe with a high-elasticity, heat-resistant, corrosion-resistant and wear-resistant coating. The steel pipe is suitable for oil well production pipes and water injection pipes meeting the requirements of 2000m-5000m deep well operations. Background technique [0002] High elastic, heat-resistant, corrosion-resistant and wear-resistant coated composite steel pipes are of great significance to oilfield exploitation. There are more than 300 million meters of oil production pipes and more than 150 million meters of water injection pipes in my country's oilfields. The number of new oil wells and updated water injection pipes added every year is even greater. They have long been used for corrosion protection by nitriding, nickel-phosphorus plating, powder coatings, and composite resins. Because the liner (coating) has one or more disadvantages such as pinholes, poor plasticity, poor corro...

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Problems solved by technology

Because the liner (coating) has one or more disadvantages such as pinholes, poor plasticity, poor corrosion resistance, unstable heat resistance, and insufficient adhesion in a hot state, the service life of the water injection pipe and the oil extraction pipe is therefore It is greatly affected, and it must be replaced in as little as a few months, and the direct economic loss of one replacement is more than 100,000 yuan, and the indirect loss is hundreds of thousands of yuan.

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