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A method for anti-corrosion treatment of inner wall of drill pipe

A technology of anti-corrosion treatment and drill pipe, which is applied in the direction of electrolytic inorganic material coating, etc., can solve the problems of thin coating, large porosity, and many leakage points, so as to improve the hardness and wear resistance of the coating, improve the ability of nitric acid resistance, and guarantee The effect of corrosion resistance

Active Publication Date: 2022-05-17
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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  • A method for anti-corrosion treatment of inner wall of drill pipe
  • A method for anti-corrosion treatment of inner wall of drill pipe

Examples

Experimental program
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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] Weigh nickel sulfate, citric acid, sodium citrate, phosphorous acid, sodium tungstate, and zirconia treated with surface activation as above, and add them into deionized water to prepare an electroplating solution. The electroplating solution is composed of: nickel sulfate 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 i...

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] Weigh nickel sulfate, citric acid, sodium citrate, phosphorous acid, sodium tungstate, and zirconia treated with surface activation as above, and add them into deionized water to prepare an electroplating solution. The electroplating solution is composed of: nickel sulfate 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→re...

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] Weigh nickel sulfate, citric acid, sodium citrate, phosphorous acid, sodium tungstate, and zirconia treated with surface activation as above, and add them into deionized water to prepare an electroplating solution. The electroplating solution is composed of: nickel sulfate 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→flo...

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Abstract

The invention discloses an anti-corrosion treatment method for the inner wall of a drill pipe. The inner wall of the drill pipe is subjected to electroplating treatment. The electroplating treatment process is divided into two stages. The first stage is electroplating a semi-bright nickel coating with a thickness of 8-25; The first stage is electroplating nickel tungsten phosphorus zirconia coating, the thickness of the coating is 18-30. The technical process of the invention is perfect and effective. It can not only effectively guarantee the anti-corrosion ability of the plating layer, but also reduce the production cost. The coating has uniform color and smooth surface, wear resistance and high stability, which reduces the wear of tooling, and is economical and effective.

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 Patents(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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