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A kind of pipe wall coating method

A coating and pipe wall technology, applied in the field of surface treatment of petroleum and mechanical engineering, can solve the problems of uneven corrosion degree, gas pipeline corrosion, uneven plating, etc., to improve the anti-corrosion ability, prolong the service life, targeted Effect

Active Publication Date: 2021-11-19
KARAMAY SHUANGXIN ANTICORROSION TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In order to solve the problem of uneven plating and lack of pertinence in the electroplating process, the pipes are fully anti-corrosion
At the same time, the tubes coated by this method have high corrosion resistance, comprehensive corrosion resistance, and are targeted to solve the problem of uneven corrosion
To effectively solve the corrosion problem of oil and gas pipelines containing hydrogen sulfide

Method used

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  • A kind of pipe wall coating method
  • A kind of pipe wall coating method
  • A kind of pipe wall coating method

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0034] This embodiment provides a method for coating the walls of oil and casing pipes, such as figure 1 As shown, the pipe wall includes the inner wall 3 , the outer wall 4 and the screw thread 2 of the pipe body 1 . Electroplating is performed on the threaded button 2 , the inner wall 3 and the outer wall 4 respectively, including: threaded button electroplating, inner wall electroplating and outer wall electroplating. The thread button electroplating includes one or more steps of thread button high temperature degreasing, thread button chemical degreasing, thread button pickling, thread button activation and thread button electroplating process. The inner wall electroplating adopts the method of flow electroplating, and before the flow electroplating, it undergoes rust removal, oil removal, pickling, neutralization and activation in sequence. The outer wall electroplating includes the steps of rust removal on the outer wall, chemical degreasing by immersion, pickling by im...

Embodiment 2

[0058] This embodiment is the pipe with anti-corrosion coating prepared by embodiment 1, such as figure 1 and figure 2 shown. The pipe with anti-corrosion coating includes a pipe body 1 and a threaded thread 2, and the inner wall 3 and the outer wall 4 of the threaded thread 2 and the pipe body 1 respectively have anti-corrosion coatings: namely, the threaded thread anti-corrosion coating 5, the inner wall anti-corrosion coating and the outer wall anti-corrosion plating.

[0059] The thread button anti-corrosion coating is metal nickel coating, and the thickness of the coating is 10 μm.

[0060] The anti-corrosion coating on the inner wall is a composite layer. From the inner wall to the outside, there are nickel coating 6 on the inner wall and nickel-tungsten-phosphorus coating 7 on the inner wall. The thickness of the composite layer is 60 μm.

[0061] The anti-corrosion coating on the outer wall is a composite layer, and from the outer wall to the outside, there are ni...

Embodiment 3

[0064] A well in Qinghai Oilfield is H 2 S is one of the more severely corroded wells. The sulfide content in the produced liquid is 20mg / L~45mg / L. On December 16, 2017, 3500 meters of pipes with anti-corrosion coating as shown in the application examples were compared with 100 meters of ordinary oil pipes. Well inspection on June 22, 2018 to prevent H 2 The S effect is obvious, and no corrosion damage occurs on the inner and outer walls, threads, and thickened sections. The expected effect was achieved. However, ordinary oil pipes are severely corroded in both the nozzle and the pipe body due to the influence of electrochemical corrosion and hydrogen-induced damage.

[0065] The invention has a perfect technological process, and performs comprehensive anti-corrosion on the inner and outer walls of the oil casing and threaded fasteners. High efficiency and strong anti-corrosion ability. Aiming at the corrosion of hydrogen sulfide, the invention completely prevents the in...

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Abstract

The invention provides a method for coating a pipe wall. The pipe wall includes an inner wall, an outer wall and a thread, and the coating method performs electroplating on the thread, the inner wall and the outer wall respectively. The inner wall electroplating adopts the method of flow electroplating. The flow electroplating method includes: the electroplating solution continuously circulates through the inner wall of the oil casing at a flow rate of 0.2-0.5 m / s to perform flow electroplating. The inner wall and outer wall electroplating are divided into two stages, and the electroplating is carried out with different electroplating solutions and electroplating conditions. The present invention has perfect technological process, and comprehensively protects the inner and outer walls of the oil casing and the screw thread. The method of the invention has high efficiency and strong anti-corrosion ability of the coating layer, which can significantly improve the anti-corrosion ability of the airtight oil casing and prolong the service life.

Description

technical field [0001] The invention relates to the field of petroleum and mechanical engineering surface treatment, in particular to a pipe wall coating method, such as an airtight oil casing inner and outer wall coating method. Background technique [0002] Hydrogen sulfide corrosion refers to the corrosion caused by a certain concentration of hydrogen sulfide and water in oil and gas pipelines. There are mainly two types of electrochemical corrosion and hydrogen-induced damage. After hydrogen sulfide is dissolved in water, it is ionized and becomes acidic, which causes the pipe to be subjected to electrochemical corrosion, resulting in thinning of the pipe wall or local pitting and perforation. After the hydrogen atoms produced in the corrosion process are absorbed by the steel, they are enriched in the metallurgical defect area of ​​the pipe, which may lead to embrittlement of the steel, initiation of cracks, and cracking. Sudden tearing or brittle fracture, weld zone ...

Claims

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Application Information

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IPC IPC(8): C25D3/12C25D5/36C25D3/56C25D5/14C25D5/50C25D7/04C23G1/08C23G1/19
CPCC23G1/081C23G1/19C25D3/12C25D3/562C25D5/14C25D5/36C25D5/50C25D7/04
Inventor 王建春李增祥许文忠段正超程娟张雪
Owner KARAMAY SHUANGXIN ANTICORROSION TECH
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