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Aerogel composite coating and application thereof in underground oil pipe

A composite coating and airgel technology, which is applied to epoxy resin coatings, devices for coating liquid on the surface, coatings, etc., can solve the problems of airgel coatings that are easy to absorb moisture and crack when exposed to water, and achieve heat preservation effects Good, reduce oil pipe wax deposition, small thermal conductivity effect

Inactive Publication Date: 2020-05-08
PETROCHINA CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The purpose of the present invention is to solve the problems of existing airgel coatings that are easy to absorb moisture and crack when exposed to water, and provide an airgel composite coating and its application in downhole oil pipes

Method used

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  • Aerogel composite coating and application thereof in underground oil pipe

Examples

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Comparison scheme
Effect test

Embodiment 1

[0037] A kind of airgel composite coating, by weight parts, comprises following component:

[0038] 10 parts of silica gel powder, 50 parts of water-based epoxy resin, 10 parts of hollow glass microspheres, 5 parts of surface modifier, 3 parts of film-forming aid, 0.1 part of leveling agent and 1 part of defoamer;

[0039] Described surface modifier is prepared by following preparation method, and described preparation method specifically comprises:

[0040] 1) adding surface active monomer and sodium phosphate to polyacrylamide aqueous solution to obtain mixed solution A;

[0041] Wherein, the concentration of the polyacrylamide aqueous solution is 55%, and the mass ratio of the surface active monomer, polyacrylamide and sodium phosphate in the mixed solution A is 1:20:0.2;

[0042] 2) Adjust the pH value of the mixed solution A to 8 to remove oxygen;

[0043] 3) Send the mixed solution A after deoxygenation into the reactor, and within 30 minutes, heat up to 40°C, then add...

Embodiment 2

[0049] A kind of airgel composite coating, by weight parts, comprises following component:

[0050]10 parts of silica gel powder, 100 parts of water-based epoxy resin, 20 parts of hollow glass microspheres, 10 parts of surface modifier, 5 parts of film-forming aid, 1.0 part of leveling agent and 2 parts of defoamer;

[0051] Described surface modifier is prepared by following preparation method, and described preparation method specifically comprises:

[0052] 1) adding surface active monomer and sodium phosphate to polyacrylamide aqueous solution to obtain mixed solution A;

[0053] Wherein, the concentration of the polyacrylamide aqueous solution is 55%, and the mass ratio of the surface active monomer, polyacrylamide and sodium phosphate in the mixed solution A is 1:20:0.2;

[0054] 2) Adjust the pH value of the mixed solution A to 10 to remove oxygen;

[0055] 3) Send the mixed solution A after deoxygenation into the reactor, and within 30 minutes, heat up to 40°C, then ...

Embodiment 3

[0061] A kind of airgel composite coating, by weight parts, comprises following component:

[0062] 10 parts of silica gel powder, 80 parts of water-based epoxy resin, 15 parts of hollow glass microspheres, 8 parts of surface modifier, 4 parts of film-forming aid, 0.5 parts of leveling agent and 1.5 parts of defoamer;

[0063] Described surface modifier is prepared by following preparation method, and described preparation method specifically comprises:

[0064] 1) adding surface active monomer and sodium phosphate to polyacrylamide aqueous solution to obtain mixed solution A;

[0065] Wherein, the concentration of the polyacrylamide aqueous solution is 55%, and the mass ratio of the surface active monomer, polyacrylamide and sodium phosphate in the mixed solution A is 1:20:0.2;

[0066] 2) Adjust the pH value of the mixed solution A to 9 to remove oxygen;

[0067] 3) Send the mixed solution A after deoxygenation into the reactor, and within 30 minutes, heat up to 40°C, then...

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Abstract

The invention discloses an aerogel composite coating and application thereof in an underground oil pipe, and belongs to the technical field of oil extraction in oil fields. The aerogel composite coating is prepared from 10 parts of silicon dioxide gel powder, 50-100 parts of waterborne epoxy resin, 10-20 parts of hollow glass beads, 5-10 parts of a surface modifier, 3-5 parts of a coalescing agent, 0.1-1.0 part of a leveling agent and 1-2 parts of an antifoaming agent. The aerogel composite coating is high in uniformity, good in film-forming property, capable of being coated outside an oil pipe, strong in adhesive force, capable of adapting to an underground oil-water environment for a long time, outstanding in heat preservation property and capable of obviously reducing the wax depositionphenomenon of the oil pipe.

Description

technical field [0001] The invention belongs to the technical field of oil field recovery, in particular to an airgel composite coating and its application in downhole oil pipes. Background technique [0002] Wax deposition is common in oil wells. Wax deposition will block oil outlet channels, increase wellhead back pressure, reduce oil well production, and increase oil well load. In order to maintain the normal production of oil wells, the methods of wax removal and prevention mainly include dosing wax remover and hot washing, etc. These methods are costly. [0003] Silica airgel has nanopores and is a porous solid material with low density, high porosity and super thermal insulation properties. The combination of silica airgel, hollow glass microspheres and film-forming materials for coatings forms a coating with super thermal insulation properties. Existing airgel coatings have the problems of easy moisture absorption and water cracking, and the downhole tubing has been...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09D163/00C09D7/61C09D7/65C09D7/47B05D7/00B05D7/24
CPCB05D7/24B05D7/586B05D2254/02B05D2504/00C08L2205/035C09D163/00C09D7/47C09D7/61C09D7/65C09D7/70C08L33/26C08L83/12C08L75/04C08K5/06C08K7/28C08K7/26
Inventor 周杨帆吕亿明崔文昊朱洪征苏祖波
Owner PETROCHINA CO LTD
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