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Method for carrying out chrome-nickel alloying treatment on steel surface of oil casing pipe

A technology of chromium-nickel alloy and treatment method, which is applied in the field of steel surface treatment of composite electroplating to achieve uniform electroplating effect

Active Publication Date: 2012-06-13
SHANGHAI UNIV +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0007] Cr is also better at inhibiting hydrogen sulfide corrosion at low temperature, but not as good as Ni

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment

[0034] The processing and steps of the present embodiment are described as follows:

[0035] Take N80 oil casing steel pipe

[0036] (1). Design the electroplating solution formula and configure the electroplating solution: the raw material composition and volume content of the electroplating solution are as follows:

[0037] Chromic anhydride 80g / L sulfuric acid 2g / L

[0038] Chromium sulfate 3g / L Potassium fluoborate 10 g / L

[0039] Strontium sulfate 7 g / L Sodium salicylate 10 g / L

[0040] Saccharin 3 g / L Nickel Sulfate 70 g / L

[0041] (2). Pretreatment of the surface of the oil and casing to be treated: wash the oil and casing to be treated with flowing cold water, chemical degreasing, hot water washing, flowing cold water washing again, weak corrosion, hot water washing again, and flowing cold water washing Cleaning, impurity removal and purification process, and finally dry and stand-by;

[0042] The above degreasing process uses Baosteel’s special degreasing age...

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Abstract

The invention relates to a method for carrying out chrome-nickel alloying treatment on the steel surface of an oil casing pipe, which belongs to the technical field of treating steel surfaces subjected to composite electroplating. The method mainly comprises the following steps: designing and preparing a chrome-nickel alloy electroplating solution; electroplating an oil casing pipe in the electroplating solution by way of pull plating; and after the electroplating is completed, carrying out laser surface heat treatment on the oil casing pipe so as to complete the chrome-nickel alloying on thesurface of the oil casing pipe. The oil casing pipe treated by the method in the invention has the advantages of small zero gravity, large hardness, and better corrosion resistance.

Description

Technical field: [0001] The invention relates to a treatment method for chromium-nickel alloying on the surface of oil casing steel, and belongs to the technical field of composite electroplating steel surface treatment. Background technique: [0002] my country's oil and natural gas exploration and development efforts are continuously increasing, and the number of drilling wells is maintained at a relatively high level every year. The drilling volume accounts for about 1 / 5 of the world's total. one. According to the plan of China National Petroleum Corporation, the company will drill 15,000 wells per year during the "Eleventh Five-Year Plan" period, with a footage of 23.3 million meters, and in 2010 it will reach 24.7 million meters. In the process of oil and gas exploration and development, a large amount of oil well tubing is consumed, which includes drill pipe and drill string components, casing and tubing. According to the well depth and string structure design, the ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C25D3/56C25D5/50
Inventor 钟庆东王毅李振华盛敏奇杜海龙
Owner SHANGHAI UNIV