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Surface phosphating processing method for oil casing coupling

A treatment method and surface phosphating technology, applied in the direction of metal material coating process, etc., can solve the problems of joint failure, unqualified commodity inspection, unqualified coupling tight distance, etc., to improve the bonding force, grain uniformity, and quality. Effect

Inactive Publication Date: 2015-04-01
HENGYANG VALIN STEEL TUBE
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the traditional phosphating process is difficult to control the thickness of the phosphate film coating, sometimes it is very thin, sometimes it is very thick, when it is thin, it is about 5-6um, and when it is thick, it exceeds 30um
When the coating is thin, it will affect the efficiency of the threaded connection, resulting in failure of the joint; when the coating is thick, it will also affect the close distance of the coupling and fail, resulting in failure of the commodity inspection in the oil field

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0022] Embodiment 1. In this embodiment, the 3-1 / 2in P110 steel grade EU oil casing coupling is subjected to surface phosphating treatment, and the specific operation steps are as follows:

[0023] A. Degreasing: Soak the oil casing coupling in the degreasing liquid, the soaking temperature is 50°C, and the time is 15 minutes; the degreasing liquid is a mixture of water and soda ash, and the ratio of water and soda ash is 1:4 , the free alkali in the oil removal solution is 30, and the pH value is 12.

[0024] B. Water washing: Put the degreased oil casing coupling into the water tank and wash it with flowing water at room temperature for 6 minutes. During the cleaning process, the oil casing coupling keeps shaking up and down in the water tank to ensure that the residual degreasing liquid is cleaned Clean, flowing water enters from the inlet at the bottom of the sink and exits from the outlet at the top of the sink, which remains filled to overflowing.

[0025] C. Surface ad...

Embodiment 2

[0033] Embodiment 2. In this embodiment, the 7inN80 steel grade BC oil casing coupling is subjected to surface phosphating treatment. The specific operation steps are as follows:

[0034] A. Degreasing: Soak the oil casing coupling in the degreasing liquid, the soaking temperature is 55°C, and the time is 15 minutes; the degreasing liquid is a mixture of water and soda ash, and the ratio of water and soda ash is 1:4 , the free alkali in the oil removal solution is 31, and the pH value is 11.

[0035]B. Water washing: Put the degreased oil casing coupling into the water tank and wash it with flowing water at room temperature for 6 minutes. During the cleaning process, the oil casing coupling keeps shaking up and down in the water tank to ensure that the residual degreasing liquid is cleaned Clean, flowing water enters from the inlet at the bottom of the sink and exits from the outlet at the top of the sink, which remains filled to overflowing.

[0036] C. Surface adjustment: I...

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PUM

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Abstract

The invention provides a surface phosphating processing method for an oil casing coupling. The method comprises the following specificoperation steps: (A) oil removal, wherein the coupling is soaked with degreasing solutions for 15+ / -5min at the temperature of 50+ / -5 DEG C; (B) water washing, wherein the degreased coupling is put into a water tank and is washed with flowing water for 6+ / -2 minat a normal temperature; (C) surface conditioning, wherein the coupling washed with the water is immersed into surface conditioning solutions for 5+ / -1 min at the temperature of 50-60 DEG C; (D) phosphating, wherein the coupling after surface conditioning is immersed into phosphating solutions at the temperature of 95-98 DEG C during phosphating processing, the phosphating processing of low-alloy steel lasts for 30-35 min, and the phosphating processing of carbon manganese steel lasts for 15-20 min; (E) water washing, wherein the coupling after phosphating is put into the water tank and is washed with flowing water for 6+ / -1 min at a normal temperature; (F) passivation, wherein the coupling after water washing is immersed into passivation solutions for 2-4 min at the temperature of 80-90 DEG C. The oil casing coupling is taken out of a passivation tank after passivation, and after a phosphating film of the oil casing coupling is dried, the thickness of the phosphating film of the oil casing coupling is measured with a Mikro Test coating thickness meter.

Description

technical field [0001] The invention relates to the technical field of metal surface phosphating, in particular to a surface phosphating treatment method for an oil casing coupling. Background technique [0002] The connection method of API tubing and casing used in the petroleum industry is mainly coupling connection. In the production process of tubing and casing couplings, the surface treatment of tubing and casing couplings is very important. The surface treatment mainly includes the following methods : Phosphating treatment, copper plating treatment, galvanization treatment, nickel plating treatment, etc. [0003] The surface phosphating of the oil casing coupling is a chemical treatment method. During the phosphating treatment, the oil casing coupling is soaked in phosphate solution, so that the surface of the oil casing coupling metal obtains a layer that is insoluble in water and Low-hardness phosphate film coating with relatively good toughness. The phosphate film ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C23C22/73C23C22/07C23C22/68C23C22/77
Inventor 付强李小兵谢凯意张垂贵吴丹李建亮夏佑广刘功威
Owner HENGYANG VALIN STEEL TUBE