Oil casing pipe resisting CO2 corrosion and production method thereof

A production method and oil-casing technology, which is applied in the direction of casing, drill pipe, earthwork drilling, etc., can solve the problems of low hardness of the coating, easy peeling of the coating, short service life, etc., and achieve high microhardness, economical Good performance, good wear resistance

Inactive Publication Date: 2011-04-06
北京百利时能源技术股份有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Its advantage is that due to the addition of alloy elements, the material itself is anti-corrosion, no other supporting facilities are required during the validity period, and it has no effect on downhole operations, but its price is expensive, and the cheapest is close to 10 times that of ordinary steel, and its economy is poor
The surface treatment technology is commonly used to coat the inner surface of the oil casing with organic anti-corrosion materials. This method has defects such as low coating hardness, poor wear resista

Method used

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  • Oil casing pipe resisting CO2 corrosion and production method thereof
  • Oil casing pipe resisting CO2 corrosion and production method thereof
  • Oil casing pipe resisting CO2 corrosion and production method thereof

Examples

Experimental program
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Example Embodiment

[0021] Example 1

[0022] The anti-CO of the present invention is produced according to the following steps 2 Corrosion oil casing:

[0023] (1) Use API commonly used steel J55 for oil casing to process the tubular base of the oil casing, and process the external thread parts at both ends.

[0024] (2) Electrolytic degreasing treatment is performed on the tubular substrate, and 8A / cm is passed into the degreasing solution at 50°C 3 The current of 0.7 mol / L, and the heat preservation for 8 min, the composition of the degreasing liquid is: 0.7 mol / L NaOH, 0.4 mol / L Na 2 CO 3 , 0.25mol / L Na 2 SiO 3 ; Use deionized water to clean the degreasing treated tubular substrate to remove the degreasing liquid, and then use the compressed air sandblasting method to derust the tubular substrate, with a sand particle size of 20 mesh.

[0025] (3) The above-treated tubular substrate is activated by the sodium nitrate activation process, so that a fresh metal layer is exposed on the surf...

Example Embodiment

[0029] Example 2

[0030] The anti-CO of the present invention is produced according to the following steps 2 Corrosion oil casing:

[0031] (1) Use API commonly used steel N80 for oil casing to process the tubular base of the oil casing, and process the external thread parts at both ends.

[0032] (2) Electrolytic degreasing treatment is performed on the tubular substrate, and 10A / cm is passed into the degreasing solution at 70°C 3 The current of 1.0 mol / L, and the heat preservation for 7 min, the composition of the degreasing liquid is: 1.0 mol / L NaOH, 0.3 mol / L Na 2 CO 3 , 0.08mol / L Na 2 SiO 3 ; Use deionized water to clean the degreasing tubular substrate to remove the degreasing liquid, and then use the compressed air sandblasting method to derust the tubular substrate. The sand particle size is 40 meshes.

[0033] (3) The above-treated tubular substrate is activated by the sodium nitrate activation process, so that a fresh metal layer is exposed on the surface of t...

Example Embodiment

[0037] Example 3

[0038] The anti-CO of the present invention is produced according to the following steps 2Corrosion oil casing:

[0039] (1) Use API commonly used steel P110 for oil casing to process the tubular base of the oil casing, and process the external thread parts at both ends.

[0040] (2) Electrolytic degreasing treatment is performed on the tubular substrate, and 5A / cm is passed into the degreasing solution at 80°C 3 The current of 1.2 mol / L and the temperature of 0.5 mol / L Na 2 CO 3 , 0.18mol / L Na 2 SiO 3 ; Use deionized water to clean the degreasing tubular substrate to remove the degreasing liquid, and then use the compressed air sandblasting method to derust the tubular substrate. The sand particle size is 30 meshes.

[0041] (3) The above-treated tubular substrate is activated by the sodium nitrate activation process, so that a fresh metal layer is exposed on the surface of the tubular substrate, thereby improving the bonding force between the electro...

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Abstract

The invention discloses an oil casing pipe resisting CO2 corrosion and a production method thereof, relating to petroleum mechanical equipment and a production method thereof, and aiming to provide an oil casing pipe which can economically and effectively resist CO2 corrosion, has compact and smooth surface, wear resistance, anticorrosion, low scaling and paraffinning probability and a production method thereof. The production method of the oil casing pipe comprises the following steps: (1) processing a tubular matrix of an oil outlet casing pipe; and processing external treaded parts at the two ends of the tubular matrix; (2) carrying out oil-removing and dust-removing treatment on the tubular matrix; (3) performing the activating treatment on the treated tubular matrix by adopting a sodium nitrate activation process; and (4) rinsing the tubular matrix after activating treatment through deionized water, soaking into an electro-deposition tank, and coating one layer of tungsten-based amorphous alloy on the tubular matrix by adopting an electro-deposition method.

Description

technical field [0001] The invention relates to petroleum mechanical equipment, in particular to an oil casing and a production method thereof. Background technique [0002] In recent years, major oil and gas fields at home and abroad have encountered CO in the process of oil and gas field exploitation. 2 corrosion problem. This not only seriously affects the production of oil and gas, but also often causes various safety accidents, hinders the normal production of oil and gas fields, and causes huge economic losses. At present, the existing technologies at home and abroad mainly include anti-CO 2 Corrosive material technology and surface treatment technology. The former by adding anti-CO 2 These steels are mainly a series of stainless steels with high Cr content (13%, 22-25%). Its advantage is that due to the addition of alloy elements, the material itself is anti-corrosion, no other supporting facilities are required during the validity period, and it has no effect on...

Claims

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Application Information

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IPC IPC(8): E21B17/00E21B17/08C25D3/56C25D7/04
Inventor 高海军
Owner 北京百利时能源技术股份有限公司
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