阅读说明：本技术 一种井下油管用气凝胶远红外保温复合涂料及其应用方法 (Aerogel far infrared thermal insulation composite coating for underground oil pipe and application method thereof ) 是由 周杨帆 吕亿明 常莉静 苏祖波 樊松 于 2020-04-29 设计创作，主要内容包括：本发明公开了一种井下油管用气凝胶远红外保温复合涂料及其应用方法,所述涂料包括底漆、中间层气凝胶涂料和面漆。所述涂料底漆、面漆均由环氧树脂制成。所述中间层气凝胶涂料包括以下重量份数的原料：二氧化硅气凝胶粉末10份、水性环氧树脂25份、苯丙乳液20份、乙酸丁酯5份、钛白粉5份、纳米陶瓷粉末10份、成膜助剂0.5份、消泡剂1份、流平剂1份、增稠剂1份、水15份。本发明制得的复合涂料均匀性高、成模性好,且具备相当强的防水抗潮性能,能长期适应井下油水环境、保温性能出众,明显降低油管结蜡现象,且无挥发物,无毒无害；导热系数小,保温效果好。(The invention discloses aerogel far infrared heat preservation composite coating for a downhole oil pipe and an application method thereof. The primer and the finish paint of the paint are both made of epoxy resin. The middle layer aerogel coating comprises the following raw materials in parts by weight: 10 parts of silicon dioxide aerogel powder, 25 parts of waterborne epoxy resin, 20 parts of styrene-acrylic emulsion, 5 parts of butyl acetate, 5 parts of titanium dioxide, 10 parts of nano ceramic powder, 0.5 part of film-forming additive, 1 part of defoaming agent, 1 part of flatting agent, 1 part of thickening agent and 15 parts of water. The composite coating prepared by the invention has high uniformity and good moldability, has quite strong waterproof and moisture-proof performances, can adapt to the underground oil-water environment for a long time, has outstanding heat-insulating performance, obviously reduces the wax deposition phenomenon of oil pipes, and has no volatile matter, no toxicity and no harm; the heat conductivity coefficient is small, and the heat preservation effect is good.)

1. An aerogel far infrared heat preservation composite coating for a downhole oil pipe is characterized by comprising a primer, an intermediate layer aerogel coating and a finish; the middle layer aerogel coating comprises the following components in parts by weight: 8-10 parts of silicon dioxide aerogel powder, 20-30 parts of water-based epoxy resin, 10-20 parts of styrene-acrylic emulsion, 2-10 parts of butyl acetate, 5-10 parts of titanium dioxide, 5-15 parts of nano ceramic powder, 0.1-0.5 part of film-forming assistant, 0.1-1.5 parts of defoaming agent, 0.1-1.3 parts of flatting agent, 1 part of thickening agent and 10-20 parts of water.

2. The aerogel far infrared thermal insulation composite coating for the downhole oil pipe as claimed in claim 1, wherein the primer and the finish paint are both made of epoxy resin.

3. The aerogel far infrared thermal insulation composite coating for the downhole oil pipe as claimed in claim 1, wherein the nano ceramic powder is a high emissivity far infrared thermal insulation material made of one or more metal oxides.

4. The aerogel far infrared thermal insulation composite coating for the downhole oil pipe as claimed in claim 3, wherein the nano ceramic powder is prepared from alumina, zirconia, nickel oxide, cobalt oxide, manganese oxide, silicon carbide and cerium oxide according to a weight ratio of 2: 2: 1: 1: 1: 3: 1, mixing and sintering the mixture, and grinding the sintered product.

5. The aerogel far infrared thermal insulation composite coating for the downhole oil pipe as claimed in claim 1, wherein the leveling agent is polyurethane or polyacrylic acid.

6. The aerogel far infrared thermal insulation composite coating for the downhole oil pipe as claimed in claim 1, wherein the thickener is carboxymethyl cellulose or hydroxypropyl methyl cellulose.

7. The application method of the aerogel far infrared thermal insulation composite coating for the downhole oil pipe as claimed in any one of claims 1 to 6, is characterized by comprising the following steps: coating a primer on the outer wall of the oil pipe, coating the primer for one time and semi-curing, and then coating the aerogel coating in the middle layer on the surface of the primer; and finally, coating a layer of epoxy resin finish paint, and completely curing after primary coating.

8. The method of use according to claim 7, wherein the primer coating thickness is 0.5-1 mm; the total thickness of the middle layer aerogel coating is 2-4 mm; the coating thickness of the finish paint is 0.5-1 mm; the middle layer aerogel coating is coated for 2 to 4 times, and is cured for 7 to 12 hours after each coating.

Technical Field

The invention belongs to the technical field of composite coatings, and particularly relates to an aerogel far infrared heat-preservation composite coating for a downhole oil pipe and an application method thereof.

Background

The oil well generally has the phenomenon of wax deposition, and the wax deposition can block an oil outlet channel, increase the wellhead back pressure, reduce the oil well yield, and can also increase the oil well load simultaneously. In order to keep the normal production of an oil well, the conventional wax removal and prevention method mainly adopts the modes of adding a wax removal agent, hot washing and the like, and the method has high cost and high labor cost.

The silicon dioxide aerogel has nanometer pores, is a porous solid material, has the structural characteristics of low density and high porosity, and has super heat insulation performance. The silica aerogel is combined with a film-forming material for the coating to form the coating with super heat-insulating property. The currently sold aerogel coating is not suitable for the products because the currently sold aerogel coating mostly has the problems of easy moisture absorption and cracking when meeting water, and the underground oil pipe is contacted with oil and water for a long time, and the currently sold aerogel coating has poor heat insulation property and cannot meet the high-efficiency heat insulation requirement of oil well produced liquid.

Disclosure of Invention

The invention aims to provide an aerogel far infrared heat-preservation composite coating for an underground oil pipe and an application method thereof, and aims to solve the problems that in the prior art, an aerogel coating is easy to absorb moisture, cracks when meeting water and is not strong in heat preservation.

In order to achieve the purpose, the invention adopts the following technical scheme:

an aerogel far infrared heat preservation composite coating for a downhole oil pipe comprises a primer, an intermediate layer aerogel coating and a finish coat;

the middle layer aerogel coating comprises the following components in parts by weight: 8-10 parts of silicon dioxide aerogel powder, 20-30 parts of water-based epoxy resin, 10-20 parts of styrene-acrylic emulsion, 2-10 parts of butyl acetate, 5-10 parts of titanium dioxide, 5-15 parts of nano ceramic powder, 0.1-0.5 part of film-forming assistant, 0.1-1.5 parts of defoaming agent, 0.1-1.3 parts of flatting agent, 1 part of thickening agent and 10-20 parts of water.

Specifically, the primer and the finish paint of the paint are both made of epoxy resin.

Specifically, the nano ceramic powder is a high-emissivity far infrared heat-insulating material made of one or more metal oxides.

Specifically, the nano ceramic powder is prepared from aluminum oxide, zirconium oxide, nickel oxide, cobalt oxide, manganese oxide, silicon carbide and cerium oxide according to the weight ratio of 2: 2: 1: 1: 1: 3: 1, mixing and sintering the mixture, and grinding the sintered product.

Specifically, the leveling agent is polyurethane or polyacrylic acid.

Specifically, the thickening agent is carboxymethyl cellulose or hydroxypropyl methyl cellulose.

The other technical scheme of the invention is as follows:

the application method of the aerogel far infrared heat-preservation composite coating for the downhole oil pipe comprises the following steps:

coating a primer on the outer wall of the oil pipe, coating the primer for one time and semi-curing, and then coating the aerogel coating in the middle layer on the surface of the primer; finally, coating a layer of epoxy resin finish paint, and completely curing after primary coating;

specifically, the coating thickness of the primer is 0.5-1 mm; the total thickness of the middle layer aerogel coating is 2-4 mm; the coating thickness of the finish paint is 0.5-1 mm; the middle layer aerogel coating is coated for 2 to 4 times, and is cured for 7 to 12 hours after each coating.

The invention has the following beneficial effects:

1. the aerogel far infrared heat-preservation composite coating for the underground oil pipe has high uniformity, good moldability, quite strong waterproof and moisture-proof performance, strong adhesive force and no volatile matter, can be coated outside the oil pipe, can adapt to the underground oil-water environment for a long time, has outstanding heat-preservation performance, can obviously reduce the wax deposition phenomenon of the oil pipe, and is non-toxic and harmless; the heat conductivity coefficient is small, and the heat preservation effect is good.

2. The invention relates to aerogel far infrared heat preservation composite coating for an underground oil pipe, wherein nano ceramic powder is prepared from aluminum oxide, zirconium oxide, nickel oxide, cobalt oxide, manganese oxide, silicon carbide and cerium oxide according to the weight ratio of 2: 2: 1: 1: 1: 3: 1, the powder has the granularity of 450 meshes, and the heat rays of the underground crude oil are mainly concentrated in a far infrared band of 6-12 mu m; due to the continuity and instantaneity of heat energy emission, most of heat energy absorbed by the heat-insulating coating provided by the invention is reflected into the oil return pipe instantly, so that the heat-insulating effect of the crude oil is improved.

3. The aerogel far infrared heat-preservation composite coating for the underground oil pipe effectively preserves the heat of produced liquid by coating the wall of the oil pipe, greatly reduces other wax removal and prevention measures and later maintenance, and provides a new way for wax prevention of an oil well and heat preservation of a ground gathering pipeline.

Detailed Description

The present invention will be described in detail with reference to examples. It should be noted that the embodiments and features of the embodiments in the present application may be combined with each other without conflict.

The following detailed description is exemplary in nature and is intended to provide further details of the invention. Unless otherwise defined, all technical terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs. The terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of exemplary embodiments according to the invention.