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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

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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 resistance and corrosion resistance, easy peeling of the coating, and short service life.
In addition, there are also patents that disclose that nitriding treatment can make the oil casing anti-corrosion and wear-resistant. In fact, the nitriding treatment only improves the surface hardness and only enhances its wear resistance, and has little beneficial effect on corrosion resistance. At the same time, the nitriding treatment needs to be Under high temperature environment, it will damage the mechanical properties of the matrix material

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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Effect test

Embodiment 1

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

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

[0024] (2) Carry out electrolytic degreasing treatment on the tubular substrate, and pass 8A / cm2 into the degreasing liquid at 50°C 3 The electric current, and keep warm for 8 minutes, the composition of degreasing liquid is: 0.7mol / L NaOH, 0.4mol / L NaOH 2 CO 3 , 0.25mol / L of Na 2 SiO 3 ; Use deionized water to clean and remove the degreasing liquid on the tubular substrate after the degreasing treatment, and then use the compressed air sandblasting method to carry out derusting treatment on the tubular substrate, and the sand particle size is 20 mesh.

[0025] (3) The sodium nitrate activation process is used to activate the above-mentioned tubular substrate, so that the fresh metal layer is exposed...

Embodiment 2

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

[0031] (1) The tubular base of the oil casing is processed by using API common oil casing steel N80, and the external thread part is processed at both ends.

[0032] (2) Carry out electrolytic degreasing treatment on the tubular substrate, and pass 10A / cm2 into the degreasing liquid at 70°C 3 current, and keep warm for 7 minutes, the composition of degreasing liquid is: 1.0mol / L NaOH, 0.3mol / L NaOH 2 CO 3 , 0.08mol / L of Na 2 SiO 3 ; Use deionized water to clean and remove the degreasing liquid on the tubular substrate after degreasing treatment, and then use compressed air sandblasting method to carry out derusting treatment on the tubular substrate, and the sand particle size is 40 mesh.

[0033] (3) The sodium nitrate activation process is used to activate the above-mentioned tubular substrate, so that the fresh metal layer is exposed on the surface of the tubu...

Embodiment 3

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

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

[0040] (2) Carry out electrolytic degreasing treatment on the tubular substrate, and pass 5A / cm2 into the degreasing liquid at 80°C 3 current, and keep warm for 5min, the composition of degreasing liquid is: 1.2mol / L NaOH, 0.5mol / L NaOH 2 CO 3 , 0.18mol / L of Na 2 SiO 3 ; Use deionized water to clean and remove the degreasing liquid on the tubular substrate after the degreasing treatment, and then use the compressed air sandblasting method to carry out derusting treatment on the tubular substrate, and the sand particle size is 30 mesh.

[0041] (3) The sodium nitrate activation process is used to activate the above-mentioned tubular substrate, so that the fresh metal layer is exposed on the surface of the tubular subst...

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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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