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Composite coating for downhole oil pipe and applying method thereof

A composite coating and composite coating technology, applied in coatings, anti-corrosion coatings, fire-resistant coatings, etc., can solve problems such as water cracking, coatings are easy to absorb moisture, etc., and achieve reduced oil pipe wax deposition, strong adhesion, and low thermal conductivity rate effect

Inactive Publication Date: 2020-04-21
PETROCHINA CO LTD
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] The purpose of the present invention is to overcome the shortcomings of existing downhole oil pipe airgel coatings that are easy to absorb moisture and crack when exposed to water, and provide a composite coating suitable for downhole oil pipes and its coating method

Method used

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  • Composite coating for downhole oil pipe and applying method thereof
  • Composite coating for downhole oil pipe and applying method thereof
  • Composite coating for downhole oil pipe and applying method thereof

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Embodiment Construction

[0032] In order to enable those skilled in the art to better understand the solution of the present invention, the technical solution in the embodiments of the present invention will be clearly and completely described below in conjunction with the embodiments of the present invention. Obviously, the described embodiments are only a part of the present invention Examples, but not all examples. Based on the embodiments of the present invention, all other embodiments obtained by persons of ordinary skill in the art without making creative efforts shall fall within the protection scope of the present invention.

[0033] The present invention adopts an airgel composite coating with ultra-low thermal conductivity, which can effectively insulate the production fluid by coating it on the tubing wall, greatly reducing other wax removal and prevention measures and later maintenance, and providing wax prevention for oil wells and ground surface. Gathering pipeline insulation provides a ...

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Abstract

The invention discloses a composite coating for a downhole oil pipe and an applying method thereof, and belongs to the technical field of oil field oil production. The composite coating for the downhole oil pipe comprises epoxy resin primer, an aerogel composite coating intermediate heat preservation layer and glass flake paint finish paint; an aerogel composite coating comprises, by weight, 10-20parts of silicon dioxide aerogel, 60-120 parts of a self-crosslinking acrylic emulsion, 15-30 parts of glass wool, 5-15 parts of titanium dioxide, 3-10 parts of hydroxyethyl cellulose, 10-30 parts ofsodium polyacrylate and 10-20 parts of ammonium hydroxide; and glass flake paint comprises, by weight, 40-50 parts of modified epoxy resin, 30-35 parts of glass flakes, 3-5 parts of a silane couplingagent, 5-10 parts of a diluent, 5-10 parts of alundum powder and 10-20 parts of an epoxy hardener. According to the composite coating for the downhole oil pipe, the problems that when an aerogel coating is applied to the downhole oil pipe, moisture absorbing and cracking under the influence of water are prone to occurring are solved.

Description

technical field [0001] The invention belongs to the field of oil recovery technology, in particular to a composite coating suitable for downhole oil pipes and a coating method thereof. 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, glass wool 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 in conta...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B05D7/00C09D5/08C09D163/00C09D133/00
CPCB05D7/586B05D2502/00B05D2504/00C08K2003/2227C08K2003/2241C08K2201/011C08L2201/08C08L2205/03C09D5/08C09D5/18C09D133/00C09D163/00C08L33/02C08L1/284C08K13/04C08K7/14C08K7/26C08K3/22C08K7/00
Inventor 周杨帆吕亿明赵春常莉静李大建
Owner PETROCHINA CO LTD
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