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Method for adopting lining pipe for corrosion prevention for joint during oil field pipeline welding

A technology for lining pipes and pipes, which is applied to pipes/pipe joints/fittings, pipeline anticorrosion/rust protection, pipeline protection, etc. It can solve the problems of corrosion at welded joints of pipelines and loss of anticorrosion performance of anticorrosion coatings, etc., to improve Excellent pipe performance, strong corrosion resistance, and easy operation

Inactive Publication Date: 2018-03-27
HARBIN INST OF TECH +2
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The traditional internal anti-corrosion method of oil pipelines is coating anti-corrosion. Commonly used coatings for inner wall coatings include: epoxy resin anti-corrosion paint, phenolic modified epoxy resin paint, polyurethane anti-corrosion paint, epoxy polyurethane anti-corrosion paint, etc.; Due to the influence of welding heat input, the traditional anti-corrosion coating at the welded joints of oilfield pipelines will cause the anti-corrosion coating to be burned and lose its anti-corrosion performance. Under the action of corrosive media, the welded joints of pipelines will be severely corroded

Method used

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  • Method for adopting lining pipe for corrosion prevention for joint during oil field pipeline welding
  • Method for adopting lining pipe for corrosion prevention for joint during oil field pipeline welding
  • Method for adopting lining pipe for corrosion prevention for joint during oil field pipeline welding

Examples

Experimental program
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Effect test

Embodiment 1

[0018] A method for anticorrosion of joints using lined pipes during welding of oilfield pipelines, as follows:

[0019] Step 1: If Figure 1-2 As shown, a notch with a width of 3 mm and a depth of 1 mm is symmetrically opened at a distance of 70 mm from the center line of the lined pipe wall with a width of 150 mm and a thickness of 2 mm;

[0020] Step 2: If Figure 3-4 As shown, after the notch of the inner liner is cleaned, the adhesive synthesized with molybdenum-modified phenolic resin is conformally coated on the notch;

[0021] Step 3: If Figure 5-6 Put the liner into the butt stainless steel tubing joint as shown and weld the butt weld;

[0022] Step 4: If Figure 7-8 As shown, under the influence of welding heat, the maximum temperature at the notch is 400°C, which drops to 200°C after about 10 seconds, and the adhesive softens and flows to fill the gap between the lining pipe and the oil pipe. Cooling after welding, the adhesive solidifies within 30-60 minutes ...

Embodiment 2

[0028] The method of this embodiment is the same as that of Embodiment 1, except that the adhesive used is a thermoplastic PI adhesive.

Embodiment 3

[0030] The method of this embodiment is the same as that of Embodiment 1, except that the adhesive used is the F series epoxy resin curing agent.

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Abstract

The invention discloses a method for adopting a lining pipe for corrosion prevention for a joint during oil field pipeline welding. The method comprises the following steps: a notch is machined in theleft and the right of the lining pipe separately; a thermosetting high-temperature-resistant adhesive is added into each notch; the lining pipe is placed into a butted oil pipe; a butt joint is welded; the high-temperature-resistant adhesive is heated by an electric arc to achieve the softening point of the high-temperature-resistant adhesive in a welding process, and a heating temperature cannotexceed the thermal decomposition temperature of the high-temperature-resistant adhesive; the high-temperature-resistant adhesive is soften to flow to fill a gap between the lining pipe and a petroleum pipeline; and the high-temperature-resistant adhesive is cured in a later cooling process to form a corrosion-resistant layer. The method disclosed by the invention is simple to operate; and the formed adhesive joint is high in corrosion resistance, and capable of greatly preventing a corrosive medium from entering the burning-loss area of the coating layer of the welded joint, thereby improvingthe performance of the pipeline.

Description

technical field [0001] The invention relates to an anti-corrosion method for joints using liner pipes when welding oilfield pipelines. Background technique [0002] With the development of the national economy, the advantages of pipeline oil transportation have become increasingly prominent. However, the buried steel oil pipeline will cause serious corrosion to the main body of the pipeline due to the influence of the transmission medium during the long-term oil transportation operation, resulting in potential operational risks for the pipeline. For the corrosion of petroleum pipelines, it is mainly electrochemical corrosion and localized corrosion. Electrochemical corrosion: due to the H in oil and gas wells 2 S, CO 2 And other corrosive gases, so electrochemical corrosion is prone to occur in downhole oil and gas pipelines. Localized corrosion: Localized corrosion is particularly serious for pipelines. Common types of localized corrosion in pipelines include: stress co...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): F16L58/18
CPCF16L58/181
Inventor 吕世雄陈幼幼戚延泽郭鹏飞王伟赵晋红周明明王振杰
Owner HARBIN INST OF TECH
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