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Conductive epoxy resin for pipeline repair and pipeline online repair method

A conductive resin, pipeline repair technology, applied in the direction of pipes/pipe joints/fittings, pipe components, mechanical equipment, etc., can solve the problems of internal defects, pipeline introduction, and low pressure bearing capacity of resin materials that cannot be fundamentally solved. Good field application effect, avoid corrosion, practical and simple process method

Active Publication Date: 2014-11-12
CHINA PETROCHEMICAL CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] In the field of damaged pipeline repair technology, Chinese patent CN1086881 proposes an improved method for repairing local damage to pipelines with a metal cladding with an inner protective sheath. The half-shells are welded together to form a cylindrical cladding around the damaged portion of the pipe, thereby creating an interior space that is sealed by pressing the seal against the toroidal flange of the cladding, after which a high pressure The resin is injected into the inner space, so that the outer sleeve bears the stress at the defect and plays the role of external repair, but this method cannot inhibit the internal corrosion of the pipeline, and when corrosion perforation occurs, the bearing capacity of the resin material will be damaged. Low pressure capacity, easy to cause gas leakage from the gap
[0004] Chinese patent CN1814666 proposes an injection organic material for pipeline repair and its preparation method, using inorganic fillers and polyurethane as modified materials, modifying epoxy resin, and quickly solidifying between the outer sleeve and the pipeline by extrusion , the on-site repair technology for pipeline leakage has a better effect, but it is still an external repair technology and cannot fundamentally solve the problem of internal defects
[0005] Chinese patent CN1221864 invented a composite structure lining and pressure extrusion coating process technology for old pipeline repair, in which three layers of protection including polymer cement slurry reinforcement layer, epoxy resin transition layer and anti-corrosion layer are sequentially formed on the inner wall of the old pipeline by extrusion method Coating, this technology can effectively cover the defects inside the pipeline, but the coating preparation process is complicated, and a large amount of solid impurities are also introduced into the pipeline

Method used

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  • Conductive epoxy resin for pipeline repair and pipeline online repair method
  • Conductive epoxy resin for pipeline repair and pipeline online repair method
  • Conductive epoxy resin for pipeline repair and pipeline online repair method

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0038] (1) Add liquid E-44 epoxy resin, liquid polyurethane, dimethyl phthalate and copper powder with a particle size of 80 microns into the vacuum dispersion at the mass percentage of 70%, 5%, 5%, and 20% In the reactor, stir at 500 rpm for 20 minutes at 30°C;

[0039] (2) The MGAZ63B sacrificial anode is processed into a powder with a particle size of 100 microns by a vacuum ball mill, and the powder and ethylenediamine are mixed according to a mass ratio of 1:1 and poured into a vacuum dispersion reactor at 30°C at 500 revolutions per minute. Stir at the speed of 10 minutes;

[0040] (3) Stir the mixture in (1) and (2) above in a vacuum reactor at a mass ratio of 6:1 at a speed of 500 revolutions per minute at 70°C for 20 minutes, and take it out to obtain a liquid conductive epoxy resin;

[0041] (4) Put two pigging balls into the pipeline to be repaired, such as figure 1 As shown, 1 and 2 are the front and rear pigs respectively. The liquid conductive epoxy resin 3 is injected...

Embodiment 2～5

[0047] (1) Prepare conductive epoxy resin base material according to the ratio in Table 1 below:

[0048]

Epoxy resin

Liquid polyurethane

Dimethyl phthalate

Conductive powder

1

50%

15%

10%

25%

2

60%

15%

10%

15%

3

80%

10%

5%

5%

4

90%

3%

2%

5%

[0049] Prepare conductive epoxy resin additives according to the ratio in Table 2 below:

[0050]

Magnesium, aluminum, zinc alloy powder

Amine curing agent

1

30%

70%

2

35%

65%

3

40%

60%

4

45%

55%

5

55%

45%

[0051] 6

60%

40%

[0052] Mix any ratio in Table 1 with any ratio in Table 2, where the mass fraction of the base material in Table 1 is 45% to 75%, and the rest are additives in Table 2.

[0053] (2) Put the two pigging balls into the pipeline to be repaired, and inject the conductive epoxy resin between the two pigs through the valve and make full contact with the pipe wall;

[0054] (3) Maintain a pressure difference of 0.3 MPa between the front and rear of the two pigs, and push ...

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Abstract

The invention discloses a conductive epoxy resin for pipeline repair and a pipeline online repair method. Specifically, two slidable sealing clamps in close contact with the pipeline inner wall are utilized to seal the repairing conductive epoxy resin containing sacrificial anode material powder particles between the clamps, gas pushes the clamps to move forward, and the filler between the clamps is extruded to fill pipe wall corrosion pits and quickly bond and solidify to the pipeline. The sacrificial anode material is employed to perform anode protection on the corrosion parts inside the pipeline, thus avoiding further corrosion of pipeline corrosion defect positions and ensuring the mechanical strength of the pipeline.

Description

Technical field [0001] The invention belongs to the technical field of repairing damaged inner walls of oil and gas pipelines, and particularly relates to a method for using powder particles of sacrificial anode material as an additive of conductive epoxy resin to protect defective pipelines. Background technique [0002] In the petroleum industry, oil and gas pipelines generally suffer from different degrees of internal wall corrosion due to different transport media, causing internal defects in the pipeline. Especially during the development, mining and transportation of natural gas containing sulfuric acid, when the pressure and temperature of natural gas change, sulfur will be 2 The solubility of S gas is reduced and precipitated. On the one hand, the sulfur deposited in the pipeline will cause sulfur blockage. In addition, sulfur and H 2 S X , H 2 S and HS - The joint action of the Gathering and Transportation pipelines promotes the corrosion of the gathering and transportati...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08L63/02C08L75/04C08K13/02C08K5/12C08K3/08C08K7/00C08K3/04F16L55/164
Inventor 高继峰龚金海银永明刘德绪万龙王勇
Owner CHINA PETROCHEMICAL CORP
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