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A thermal spray sealing agent suitable for high temperature and high pressure downhole environment and its application method

A technology of high temperature, high pressure and pore sealing agent, applied in coating, melt spraying, anti-corrosion coating, etc., can solve the problems of unsuitable bimetal composite spray coating, affecting performance, etc., to enhance adhesion and anti-corrosion performance, reduce porosity rate, the effect of reducing corrosion

Active Publication Date: 2020-03-10
PETROCHINA CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The high-temperature curing molding process of these two layers is not suitable for the industrial application of bimetallic composite spray coatings outside oil pipes, and may even affect its performance

Method used

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  • A thermal spray sealing agent suitable for high temperature and high pressure downhole environment and its application method

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0030] Step 1: In terms of mass fraction, mix 63% polysilsesquioxane, 8% ceramic powder with a particle size of 30nm, and 30% silica hydrosol with a particle size of 10nm, and fully stir to obtain a sealing agent, wherein , The preparation method of polysilsesquioxane is: mix 3-glycidyl etheroxypropyltrimethoxysilane KH560 and tetraethyl orthosilicate TEOS at a mass ratio of 78:22, add deionized water, use HCl as a catalyst, where H 2 The molar ratio of O, HCl and KH560 is 2:0.0005:1, fully stirred and reacted at 80°C for 50 minutes to form polysilsesquioxane;

[0031] Step 2: Apply the sealing agent evenly on the surface of the thermal spray coating with an atomized spraying method. Dry at low temperature.

[0032] Experiment results and analyze the results.

Embodiment 2

[0034] Step 1: In terms of mass fraction, mix 70% polysilsesquioxane, 5% ceramic powder with a particle size of 20nm, and 26% silica hydrosol with a particle size of 20nm, and fully stir to obtain a sealing agent, wherein , The preparation method of polysilsesquioxane is: mix 3-glycidyl etheroxypropyltrimethoxysilane KH560 and tetraethyl orthosilicate TEOS at a mass ratio of 90:30, add deionized water, use HCl as a catalyst, where H 2 The molar ratio of O, HCl and KH560 is 3:0.0003:1, fully stirred and reacted at 70°C for 60 minutes to form polysilsesquioxane;

[0035]Step 2: Use atomized spraying method to evenly coat the sealing agent on the surface of the thermal spray coating with a coating thickness of 20 μm, so that the sealing agent can fully penetrate into the pores of the coating, and then apply the sealing agent at 60°C Dry at low temperature.

Embodiment 3

[0037] Step 1: In terms of mass fraction, mix 60% polysilsesquioxane, 10% ceramic powder with a particle size of 50nm and 25% silica hydrosol with a particle size of 15nm, and fully stir to obtain a sealing agent, wherein , The preparation method of polysilsesquioxane is: mix 3-glycidyl etheroxypropyltrimethoxysilane KH560 and ethyl orthosilicate TEOS at a mass ratio of 70:10, add deionized water, use HCl as a catalyst, where H 2 The molar ratio of O, HCl and KH560 is 1:0.001:1, fully stirred and reacted at a temperature of 90°C for 10 minutes to form polysilsesquioxane;

[0038] Step 2: Use atomized spraying method to evenly coat the sealing agent on the surface of the thermal spray coating with a coating thickness of 10 μm, so that the sealing agent can fully penetrate into the pores of the coating, and then apply the sealing agent at 80°C Dry at low temperature.

[0039] Table 1 shows the corrosion rate of the metal sprayed coating after the sealing treatment in Examples ...

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Abstract

The invention discloses a thermal-spraying hole sealing agent suitable for high temperature and high pressure underground environment and a use method thereof. The hole sealing agent is prepared fromthe following raw materials by mass percent: 60-70% of polysilsesquioxane, 5-10% of filler and 25-30% of sol. When the hole sealing agent is used, the hole sealing agent is uniformly coated on the surface of a thermal-spraying coating by adopting an atomization spraying method, the spraying thickness is 10-20 microns, the hole sealing agent fully penetrates into the pores of the coating, and then,the hole sealing agent is dried at the temperature of 60-80 DEG C. The hole sealing agent provided by the invention has good penetrability and stability and has excellent resistance to H2S and CO2 corrosion.

Description

technical field [0001] The invention belongs to the technical field of thermal spraying and relates to a preparation method of a sealing agent and a method for using the same, in particular to a thermal spraying sealing agent suitable for high-temperature and high-pressure downhole environments and a method for using the same. Background technique [0002] Some domestic low-production gas wells contain H 2 S, CO 2 Acid gas, at the same time Cl in formation water of gas well - and higher salinity at H 2 S, CO 2 , Cl - Under the combined effect, the carbon steel pipe column is severely corroded, and some wells have corrosion and perforation within 3-5 years. Due to the low single well production of this type of well, if high-grade corrosion-resistant alloys are selected, the cost of single-well pipes will increase significantly, which will affect the benefits of oilfield development. It is necessary to seek cost-effective anti-corrosion measures to improve the corrosion r...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C09D183/04C09D5/08C09D7/61C23C4/18
CPCC08K3/00C08K3/36C09D5/08C09D5/18C09D183/04C23C4/18
Inventor 李明星李琼玮朱方辉周明明张振云刘伟董晓焕奚运涛
Owner PETROCHINA CO LTD
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