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Composite heat carrier medium anti-corrosion coating and preparation method thereof

A composite heat carrier and anti-corrosion coating technology, applied in coating, metal material coating process, melt spraying and other directions, can solve the problems of equipment pipeline and oil field injection system corrosion, oil field economic loss, strong corrosion, etc. To achieve the effect of improving spray atomization, increasing density and bonding force, and increasing density

Active Publication Date: 2019-09-17
BC P INC CHINA NAT PETROLEUM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] However, since the composite heat carrier is a mixture composed of high-temperature and high-pressure water vapor, nitrogen, carbon dioxide, and residual oxygen, etc., it is highly corrosive, and equipment pipelines and oilfield injection systems face great corrosion risks.
Therefore, failure accidents often occur, which bring huge economic losses and potential safety hazards to the oil field.

Method used

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Examples

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Effect test

preparation example Construction

[0025] The invention provides an anticorrosion coating suitable for composite heat carrier medium and a preparation method thereof. The coating is calculated by weight percentage, and its element composition includes: Al: 3.0-7.5%, Cr: 20.0-23.0%, Ni: 23.0-26.0%, Co: 23.0-26.0%, Re: 0.5-2.0%, Si: 0.5-1.5% and Fe: 22.0-25.0%.

[0026] The coating is prepared by a low-pressure plasma spraying method, and the coated substrate material is carbon steel or low-alloy steel; the coating is composed of a single FCC solid solution phase; there is an interdiffusion layer at the interface between the coating and the substrate, The interdiffusion layer contains Fe, Cr, Ni, Co and Al elements, and the thickness of the interdiffusion layer is 5 μm to 10 μm;

[0027] The preparation method of described coating comprises the following steps:

[0028] Step 1: Prepare coating material

[0029] (1) By weight percentage, Al: 3.0-7.5%, Cr: 20.0-23.0%, Ni: 23.0-26.0%, Co: 23.0-26.0%, Re: 0.5-2.0%...

Embodiment 1

[0037] Step 1: Prepare coating material

[0038] (1) By weight percentage, Al: 5.5%, Cr: 21.5%, Ni: 24.0%, Co: 24.0%, Re: 1.0%, Si: 1.0%, Fe: 23.0%, are mixed evenly and then ground to produce Obtain alloy powder with a particle size of 250-400 mesh;

[0039] (2) After mixing the alloy powder prepared in step (1) with a binder, grinding to obtain a mixed powder with a particle size of 250 to 400 mesh;

[0040] (3) spraying, drying and granulating the mixed powder prepared in step (2) to obtain a coating material with a particle size of 200 to 250 mesh;

[0041] The second step: substrate surface treatment

[0042] After thermally cleaning the N80 substrate at 400°C for 1 hour, the surface of the carbon steel substrate was sandblasted with a sandblasting machine. After sandblasting, the surface roughness of the substrate was R Z =40~80μm;

[0043] The third step: low-pressure plasma spraying coating

[0044] The parameters of plasma spraying are: tank pressure 8~20×10 3 p...

Embodiment 2

[0048] Step 1: Prepare coating material

[0049] (1) By weight percentage, Al: 3%, Cr: 20%, Ni: 26%, Co: 23%, Re: 2%, Si: 1.0%, Fe: 25.0%, are mixed evenly and then ground to produce Obtain alloy powder with a particle size of 250-400 mesh;

[0050] (2) After mixing the alloy powder prepared in step (1) with a binder, grinding to obtain a mixed powder with a particle size of 250 to 400 mesh;

[0051] (3) spraying, drying and granulating the mixed powder prepared in step (2) to obtain a coating material with a particle size of 200 to 250 mesh;

[0052] The second step: substrate surface treatment

[0053] After the N80 material substrate was thermally cleaned at 400°C for 1 hour, the surface of the low-alloy steel substrate was sandblasted with a sandblasting machine. After sandblasting, the surface roughness of the substrate was R Z =40~80μm;

[0054] The third step: low-pressure plasma spraying coating

[0055] The parameters of plasma spraying are: tank pressure 8~20×10 ...

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Abstract

The invention provides a composite heat carrier medium anti-corrosion coating and a preparation method thereof. The coating comprises the following elements of, in percentage by weight, 3.0%-7.5% of Al, 20.0%-23.0% of Cr, 23.0%-26.0% of Ni, 23.0%-26.0% of Co, 0.5%-2.0% of Re, 0.5%-1.5% of Si, and 22.0%-25.0% of Fe. The main components of the coating are the five elements of Al, Cr, Ni, Co and Fe, and the five elements can form an AlxCoCrFeNi series high-entropy alloy in the coating, and the excellent mechanical property is achieved; meanwhile, the five elements have the excellent corrosion resistance and high temperature resistance; and the binding force between the coating prepared through the method and an N80 carbon steel base material can reach 145 MPa or higher.

Description

technical field [0001] The invention relates to material surface anticorrosion technology, in particular to a composite heat carrier medium anticorrosion coating and a preparation method thereof. Background technique [0002] Composite heat carrier foam flooding is a high-temperature composite heat carrier composed of water vapor, nitrogen and carbon dioxide by fully combusting diesel or gasoline with air in high-temperature and high-pressure equipment. The generated high-temperature composite heat carrier and foaming agent are organically combined, coordinated and compatible, and injected into the downhole oil layer through the foam generator to evenly displace the remaining oil in the oil layer and improve the ultimate recovery. It has multiple advantages such as chemical flooding, nitrogen flooding, carbon dioxide flooding, steam thermal flooding and foam flooding, etc. It can be used as an effective replacement technology in the late stage of oilfield tertiary oil recove...

Claims

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Application Information

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IPC IPC(8): C23C4/134C23C4/06C22C30/00
CPCC23C4/134C23C4/06C22C30/00
Inventor 蔡锐韩燕李发根徐秀清吕乃欣袁军涛
Owner BC P INC CHINA NAT PETROLEUM CORP
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