Anti-corrosion treatment method for inner wall of drill pipe

An anti-corrosion treatment and drill pipe technology, applied in the direction of electrolytic inorganic material coating, etc., can solve the problems of many leakage points, large porosity, thin coating, etc., to improve the ability of nitric acid resistance, ensure the anti-corrosion ability, improve the hardness of the coating and The effect of abrasion resistance

Active Publication Date: 2021-04-09
KARAMAY SHUANGXIN ANTICORROSION TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0008] The invention is mainly aimed at nickel-phosphorus electroless plating to solve the problems of thin plating, large porosity and many leakage points

Method used

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  • Anti-corrosion treatment method for inner wall of drill pipe

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Effect test

Embodiment 1

[0030] Take 30-50nm zirconia particles and rinse them with clean water, put them into a hydrochloric acid solution with a volume ratio of hydrochloric acid and water of 1:1, soak for 2 hours, wash with water, put them into 150g / L trisodium phosphate solution for 3 minutes, and then wash with water to get Surface-activated zirconia.

[0031] Sulfuric acid, citric acid, sodium citrate, phosphorous acid, sodium tungstate, and zirconia treated with surface activation as above were weighed and added to deionized water to prepare an electroplating solution. The electroplating solution is composed of: sulfuric acid 100g / L, citric acid 60g / L, sodium citrate 100g / L, phosphorous acid 45g / L, sodium tungstate 100g / L, zirconia 12g / L, and the balance is water.

[0032] Take the drill pipe and carry out electroplating anti-corrosion treatment on its inner wall. The electroplating process includes the following steps:

[0033] High temperature degreasing→installing tooling→rust removal of in...

Embodiment 2

[0046] Take 30-50nm zirconia particles and rinse them with clean water, put them in a hydrochloric acid solution with a volume ratio of hydrochloric acid and water of 1:2, soak for 1 hour, wash with water, soak in 100g / L sodium phosphate solution for 2 minutes, and then wash with water to get the surface Activated zirconia.

[0047] Sulfuric acid, citric acid, sodium citrate, phosphorous acid, sodium tungstate, and zirconia treated with surface activation as above were weighed and added to deionized water to prepare an electroplating solution. The electroplating solution is composed of: sulfuric acid 300g / L, citric acid 6g / L, sodium citrate 15g / L, phosphorous acid 7g / L, sodium tungstate 100g / L, zirconia 5g / L, and the balance is water.

[0048] Take the drill pipe and carry out electroplating anti-corrosion treatment on its inner wall. The electroplating process includes the following steps:

[0049] High temperature degreasing→installing tooling→rust removal of inner wall→rep...

Embodiment 3

[0062] Take 30-50nm zirconia particles and rinse them with clean water, put them into hydrochloric acid and water 1:1 hydrochloric acid solution and soak for 3 hours. Treated zirconia.

[0063] Sulfuric acid, citric acid, sodium citrate, phosphorous acid, sodium tungstate, and zirconia treated with surface activation as above were weighed and added to deionized water to prepare an electroplating solution. The electroplating solution is composed of: sulfuric acid 200g / L, citric acid 30g / L, sodium citrate 60g / L, phosphorous acid 25g / L, sodium tungstate 40g / L, zirconia 8g / L, and the balance is water.

[0064] Take the drill pipe and carry out electroplating anti-corrosion treatment on its inner wall. The electroplating process includes the following steps:

[0065] High temperature degreasing→installing tooling→rust removal of inner wall→replacing tooling→flowing degreasing→flowing water washing→flowing pickling→flowing water washing→flowing neutralization→installing anodes→flow...

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Abstract

The invention discloses an anti-corrosion treatment method for an inner wall of a drill pipe. The inner wall of the drill pipe is electroplated, an electroplating treatment process is divided into two stages, the first stage is electroplating of a semi-bright nickel plating layer, and the thickness of a plating layer is 8-25; and in the second stage, a nickel-tungsten-phosphorus-zirconium oxide plating layer is electroplated, and the thickness of the plating layer is 18-30. The technological process is perfect and effective. The corrosion resistance of the plating layer can be effectively guaranteed, and the production cost can be reduced. The plating layer is uniform in color and luster, smooth in surface, wear-resistant, high in stability, economical and effective, and the abrasion loss of the tool is reduced.

Description

technical field [0001] The invention relates to the field of petroleum and mechanical engineering surface treatment, in particular to an anticorrosion method for the inner wall of a drill pipe. Background technique [0002] Drill pipe is one of the main tools used in oil and gas exploration and development, accounting for 80-90% of the entire drill string length. During the drilling process, the failure of the drill pipe is a very serious problem. Although the torque, tensile strength, compressive strength, bending stress, etc. of the drill pipe are accurately calculated under ideal conditions before drilling, the corrosion of the drill pipe in the drilling fluid during the actual drilling process makes the drill pipe Failures always exceed expectations. According to the statistics of drilling tool failure analysis projects undertaken by China Petroleum Tubular Research Institute in 2006, among the 32 drilling tool failure items, the total number of drill pipe failures rea...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C25D3/12C25D9/04C25D5/20C25D5/34C25D7/04B24C1/08
CPCC25D3/12C25D9/04C25D5/20C25D5/34C25D7/04B24C1/086
Inventor 许文忠段正超刘大陆程娟张雪牛俊杰王雷王少宇
Owner KARAMAY SHUANGXIN ANTICORROSION TECH
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