Anti-drag and anticorrosion coating for inner wall of natural gas/condensed liquid pipeline and preparation method thereof

Abstract

The invention discloses an anti-drag and anticorrosion coating for an inner wall of a natural gas / condensed liquid pipeline and a preparation method thereof. The coating comprises an ingredient A and an ingredient B according to a mass ratio of (2-4):1, wherein the ingredient A comprises the following ingredients in parts by mass: 5-30 parts of liquid organic silicon resin, 30-55 parts of liquid epoxy resin, 1-15 parts of flexibilizer, 0.1-2 parts of leveling agent, 0.1-1.5 parts of defoaming agent, 0.05-1.5 parts of dispersing agent, 0.1-2 parts of coupling agent, 0.0-2 parts of anti-settling agent, 0-15 parts of pigment and 10-60 parts of filler; the ingredient B comprises the following ingredients in parts by mass: 40-70 parts of modified polyamine curing agent, 5-35 parts of phenolic resin curing agent, 0.5-2.5 parts of dispersant, 0.5-2.5 parts of anti-settling agent and 15-50 parts of filler; and the ingredient A and the ingredient B in the coating are packaged in a binary manner. The coating has the advantages of good resistance to high pressure natural gas or gas-liquid decompression and bubbling, shear resistance, high bonding strength, good wear resistance, resistance tocorrosion of natural gas condensed liquid, smoothness and compactness of the coating, no solvent, quick drying and the like below 50 DEG C, and is suitable for mining requirements under anti-drag, anticorrosion and wear-resistant environments.

Description

technical field [0001] The invention relates to a drag-reducing and anti-corrosion coating for the inner wall of a pipeline for transporting mixed natural gas on land and sea and a preparation method thereof. Background technique [0002] Most of the natural gas mined in the ocean is condensate gas, which is a gas mixture with multiple components, mainly saturated hydrocarbon components. Pipeline transportation gradually replaces traditional shipping methods. The pipeline transportation methods can be divided into mixed transportation, gas-liquid There are two kinds of points and losses. Due to the low investment and short construction period of gas-liquid mixed transportation, only one pipeline needs to be built, and the gas-liquid separation does not need to be separated on the gas production platform, and the initial processing technology of natural gas is simple. However, during the pipeline transportation process of condensate gas, the phenomenon of condensation and re...

AI Technical Summary

Problems solved by technology

[0008] The existing drag-reducing coatings in pipelines are mostly low-solid coatings with a large solvent content, and the thickness of a single coating is relatively thin. During the film-forming process, pinholes are caused by the volatilization of solvents, and a certain amount of thick coatings still remain locally. The high content of solvents has poor permeability resistance to chemical media such as carbon dioxide, hydrogen sulfide, phosphate ester synthetic oil, salt water, and heavy hydrocarbons; the coating is soft and has poor wear resistance; the bonding strength is low, generally only a few MPa, It often causes damage forms such as blistering, cracking and delamination of the drag-reducing coating in the pipeline

Therefore, this type of coating is generally only suitable for the drag reduction effect in the gas-liquid environment at room temperature, and has no anti-corrosion and drag reduction effects at higher service temperatures.

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