Spraying method for electric arc spraying coating of well drilling water string and hole sealing coating thereof

An arc spraying and water riser technology, which is applied in the coating, the device for coating liquid on the surface, the spraying device, etc., can solve the problems of complicated spraying of sealing agent, unsatisfactory coating quality and complicated processing technology, etc. To achieve the effect of simple and reliable spraying process, saving spraying operation time and spraying site, and simple device design

Pending Publication Date: 2018-08-10
YANGZHOU UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Benefits of technology

This patented technology describes an improved way to coat metal structures such as pipes or tubular members without damaging them over their lifetime. It involves applying a special type of liquid substance called cathode ray wires (CRWs) onto surfaces while also adding another type of fluid called coolant solvent into these areas beforehand. By doing both types together, there will improve durability and prevent failure under severe conditions like abrasion. Additionally, the inventors have developed a fixed mount system where they allow for easier replacement of worn components. Overall, this innovative solution improves protection against corrosion compared to existing methods.

Problems solved by technology

This patents describes different methods and techniques involved during the manufacturing of undersea oil well pipelines. These include traditional methods like casting overall, including submerged injection systems and laser cladding technology. However, these technical solutions are limited by their durability against environmental factors such as salt damage due to acid rain attacks. Therefore, they require longer lasting antirrification coatings applied before being able to prevent rust formation caused by hydrogen sulfide attack.

Method used

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  • Spraying method for electric arc spraying coating of well drilling water string and hole sealing coating thereof
  • Spraying method for electric arc spraying coating of well drilling water string and hole sealing coating thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0043] 1. The arc spray gun and the sealing spray gun are installed at an interval of 1 m.

[0044] 2. Spray Al with a diameter of 3.0 mm on the pretreated waterproof casing by arc spraying technology 2 o 3 / Al-Zn powder core wire.

[0045] 3. When spraying the metal coating for the last time, open the sealing spray gun and apply a sealant at the same time. The dry film thickness of the sealing coating is 30-80 microns.

[0046] The test piece was subjected to a corrosion test in 3.5% NaCl solution, and the test piece was taken out, and it was found that the surface morphology of the composite coating of the test piece did not change, and all coating surfaces did not appear blistering, rusting, peeling, etc.

Embodiment 2

[0048] The difference between this embodiment and embodiment 1 is: in step 1, adjust the distance between the spray guns according to the sealing agent; in step 2, select the Al-Mg-Ti-RE powder core wire material with a diameter of 3.0 mm; in step 3, seal the hole The agent is sprayed twice, and the dry film thickness of the seal coat is 50-100 microns.

[0049] The test piece was subjected to a corrosion test in 3.5% NaCl solution, and the test piece was taken out, and it was found that the surface morphology of the composite coating of the test piece did not change, and all coating surfaces did not appear blistering, rusting, peeling, etc.

Embodiment 3

[0051] The difference between this embodiment and Example 1 is: in step 1, the spray gun spacing is adjusted according to the sealing agent; in step 2, the Fe-Cr-Ni powder core wire material with a diameter of 3.0 mm is selected; The dry film thickness of the seal coat is 50-100 microns.

[0052] The test piece was subjected to a corrosion test in 3.5% NaCl solution, and the test piece was taken out. It was found that the surface morphology of the composite coating of the test piece did not change, and all the coating surfaces did not appear blistering, rusting, peeling, etc.

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Abstract

The invention discloses a spraying method for an electric arc spraying coating of a well drilling water string and a hole sealing coating thereof. The spraying method comprises the steps that a protective coating is prepared on the surface of a water string base body by an electric arc spraying process, and at the same time, the hole sealing coating is sprayed, and the protective coating of the surface of the water string with high hardness, wear resistance and pitting corrosion resistance is obtained. The service life is effectively prolonged, and the cost of use and maintenance is reduced.

Description

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Claims

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Application Information

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Owner YANGZHOU UNIV
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