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Composite coating heat-insulating corrosion-resistant oil pipe

A composite coating and oil pipe technology, applied in coatings, anti-corrosion coatings, drilling pipes, etc., can solve the problems of downhole accidents, maintenance of human resources, and high costs, and achieve the effect of inhibiting the precipitation of wax crystals and having obvious thermal insulation effects.

Active Publication Date: 2017-01-04
PETROCHINA CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At present, wax removal and prevention methods for oil pipes mainly adopt mechanical wax scraping method, chemical wax removal method, sonic electromagnetic method, etc. These methods are costly and require human resources to maintain, and the management cost is high
[0003] At present, there are literature and patent reports that some blocks use low thermal conductivity materials for oil pipe insulation, such as airgel felt, rock wool, polyurethane foam, etc. Downhole operating environment with tubing
At the same time, due to the influence of the annular space of the oil casing, it is easy to cause downhole accidents when the over-thick coating is run into the well

Method used

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  • Composite coating heat-insulating corrosion-resistant oil pipe

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0024] Such as figure 1 As shown, a composite coating heat-insulating and anti-corrosion oil pipe, the substrate of the heat-insulating oil pipe is a metal oil pipe 1, the inner surface of the metal oil pipe 1 is coated with an airgel inner coating 2, and the outer surface is coated with an anti-corrosion air gel Glue outer coating3. The airgel inner coating 2 and the anti-corrosion airgel outer coating 3 constitute the airgel composite coating.

[0025] When coating the inner surface of the metal oil pipe 1 with an airgel inner coating 2 and the outer surface of the metal oil pipe 1 with an anti-corrosion airgel outer coating 3, the inner and outer surfaces of the oil pipe must first be polished to remove rust and dirt After phosphating, coating is carried out.

[0026] Run the above-mentioned airgel composite coating heat-insulated tubing into the required depth according to the wax deposition position of a single well. For example, if the pump depth of a well is 2000m, an...

Embodiment 2

[0028] On the basis of Example 1, an airgel inner coating 2 and an anti-corrosion airgel outer coating 3 are evenly coated on the inner and outer walls of the metal oil pipe 1: the inner airgel coating 2 is formed from the inner The outer layer is composed of a high-solid epoxy bottom layer and an airgel slurry surface layer. The high-solid epoxy bottom layer and the airgel slurry surface layer are sprayed once to form a film. The airgel inner coating 2 is preferably 400-600 μm in thickness; The anti-corrosion airgel outer coating 3 is composed of a high-solid epoxy bottom layer and an anti-corrosion airgel surface layer from the inside to the outside. The high-solid epoxy bottom layer and the anti-corrosion airgel surface layer are sprayed once to form a film. The coating thickness of the gel outer coating 3 is preferably about 1 mm; the inner and outer composite coatings can effectively insulate the oil pipe, reduce the surface roughness of the oil pipe, prevent the condensat...

Embodiment 3

[0030] On the basis of the above examples, the high-solid epoxy bottom layer is cured with high-solid epoxy resin, and the solid content of the high-solid epoxy resin is greater than 94% of the coating thickness of the high-solid epoxy bottom layer It is preferably 150-300 μm, and the high-solid epoxy resin is purchased from Shanghai Xitai Industrial Coatings Co., Ltd.

[0031] The airgel paste surface layer is formed by mixing hydrophobic airgel powder, glass fibers and film-forming aids according to the mass ratio of 6:3:1; the heat conduction of the airgel paste surface layer The coefficient is less than 0.08W / m.k, and the coating thickness is not less than 300μm.

[0032] The anti-corrosion airgel surface layer is formed by mixing polyethylene, hydrophobic airgel powder, glass fiber and film-forming aids in a mass ratio of 3:4:2:1, and the anti-corrosion airgel The thermal conductivity of the rubber surface layer is less than 0.20W / m.k, and the coating thickness is prefer...

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Abstract

The invention provides a composite coating heat-insulating corrosion-resistant oil pipe. A basic body of the heat-insulating oil pipe is a metal oil pipe, the inner surface of the metal oil pipe is coated with an inner aerogel coating, and the outer surface of the metal oil pipe is coated with an outer corrosion-resistant aerogel coating. Due to the fact that the heat conductivity coefficient of the aerogel coatings is low, heat conduction and heat convection between crude oil and the borehole wall are almost stopped; and by the adoption of the inner wall coating and the outer wall coating, the heat insulating effect is more remarkable. The crude oil keeps flowing higher than the wax precipitation temperature point before flowing out of a wellhead, so that wax crystal precipitation is restrained, and the wax prevention effect is achieved. Meanwhile, an anticorrosive material is added to the outer coating, so that the outer wall of the oil pipe is prevented from being corroded by produced high-salinity fluid.

Description

technical field [0001] The invention relates to an oil pipe in the field of oil field exploitation, in particular to a heat-insulating and anti-corrosion oil pipe with a composite coating. Background technique [0002] Wax deposition is one of the problems affecting oil well production. For crude oil with high wax content, wax deposition will block oil outlet channels, increase wellhead back pressure, reduce oil well production, and increase oil well load, resulting in production accidents. In order to maintain the normal production of oil wells, it is necessary to regularly carry out wax removal and anti-wax operations on oil wells. At present, wax removal and prevention methods for oil pipes mainly adopt mechanical wax scraping method, chemical wax removal method, sonic electromagnetic method, etc. These methods are costly and require human resources to maintain, and the management cost is high. [0003] At present, there are literature and patent reports that some blocks...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): E21B17/00C09D163/00C09D7/12C09D5/08
CPCC08K7/14C09D5/08C09D7/70C09D163/00E21B17/00C08L23/06
Inventor 崔文昊甘庆明吕亿明李亚洲罗有刚牛彩云朱洪征王百常莉静
Owner PETROCHINA CO LTD
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