Method of improving corrosion resistance of oil tube

A corrosion-resistant, oil-pipe technology, used in pipeline protection, overlay coating, pipeline anti-corrosion/rust protection, etc., can solve the problems of reduced mechanical properties, unattainable, high brittleness of oil pipes, etc., and achieves temperature resistance performance Good, high corrosion resistance, the effect of improving the corrosion resistance

Inactive Publication Date: 2014-06-04
四川中久红宇科技有限公司 +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In recent years, some oil fields have begun to use nitriding technology to treat oil pipes. After nitriding, the corrosion resistance of oil pipes has been significantly improved, but the oil pipes are brittle and their mechanical properties are significantly reduced, so that they cannot meet the indicators specified in API standards.

Method used

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  • Method of improving corrosion resistance of oil tube
  • Method of improving corrosion resistance of oil tube
  • Method of improving corrosion resistance of oil tube

Examples

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Effect test

Embodiment 1

[0050] This embodiment provides a method for improving the corrosion resistance of oil pipelines, the method comprising the following steps:

[0051] 1) Pre-cleaning;

[0052] 2) Installing the card: install the oil pipeline into the tooling;

[0053] 3) Preheating: Preheat the X80 oil pipeline in an air heating furnace at a temperature of 375°C for 30 minutes;

[0054] 4) Nitride ion infiltration: the preheated oil pipeline enters the nitrogen carbon ion infiltration furnace, the temperature is 600 ° C, and the time is 75 minutes; the nitrogen carbon yttrium ion infiltration agent is composed of: Na 2 CO 3 11%, K 2 CO 3 15%, NaCl24%, CO(NH 2 ) 2 40%, K 2 SO 3 2%, CeCO 3 2%, LiOH5%, YCl 3 1%;

[0055] 5) Ion activation: The oil delivery pipe infiltrated by nitrogen carbon yttrium ions enters the ion activation furnace, the temperature is 500 ° C, and the time is 75 minutes; the ion activation penetration agent is composed of: Na 2 SO 4 7%, Na 2 CO 3 10%, K 2 CO...

Embodiment 2

[0062] This embodiment provides a method for improving the corrosion resistance of oil pipelines, the method comprising the following steps:

[0063] 1) Pre-cleaning;

[0064] 2) Installing the card: install the oil pipeline into the tooling;

[0065] 3) Preheating: Preheat the X80 oil pipeline in an air heating furnace at a temperature of 300°C for 40 minutes;

[0066] 4) Nitride ion infiltration: the preheated oil pipeline enters the nitrogen carbon ion infiltration furnace, the temperature is 550 ° C, and the time is 120 minutes; the nitrogen carbon yttrium ion infiltration agent is composed of: Na 2 CO 3 10%, K 2 CO 3 10%, NaCl23.97%, CO(NH 2 ) 2 40%, K 2 SO 3 3%, CeCO 3 3%, LiOH10%, YCl 3 0.03%;

[0067] 5) Ion activation: The oil delivery pipe infiltrated by nitrogen carbon yttrium ions enters the ion activation furnace at a temperature of 450°C for 120 minutes; the ion activation permeation agent is composed of: Na 2 SO 4 5%, Na 2 CO 3 12%, K 2 CO 3 12%...

Embodiment 3

[0074] This embodiment provides a method for improving the corrosion resistance of oil pipelines, the method comprising the following steps:

[0075] 1) Pre-cleaning;

[0076] 2) Installing the card: install the oil pipeline into the tooling;

[0077] 3) Preheating: Preheat the X80 oil pipeline in an air heating furnace at a temperature of 450°C for 20 minutes;

[0078] 4) Nitride ion infiltration: the preheated oil pipeline enters the nitrogen carbon ion infiltration furnace, the temperature is 660 ° C, and the time is 30 minutes; the nitrogen carbon yttrium ion infiltration agent is composed of: Na 2 CO 3 15%, K 2 CO 3 20%, NaCl25%, CO(NH 2 ) 2 31%, K 2 SO 3 2%, CeCO 3 1%, LiOH5%, YCl 3 1%;

[0079] 5) Ion activation: The oil delivery pipe infiltrated by nitrogen carbon yttrium ions enters the ion activation furnace at a temperature of 550°C for 120 minutes; the ion activation permeation agent is composed of: Na 2 SO 4 10%, Na 2 CO 3 10%, K 2 CO 3 10%, NaCl2...

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Abstract

The invention provides a method of improving corrosion resistance of an oil tube. The method comprises the following steps: (1) pre-cleaning; (2) card mounting; (3) pre-heating; (4) nitrogen-carbon-yttrium ion penetrating; (5) ion activating; (6) oxygen ion penetrating; (7) post-cleaning; (8) ion stabilizing, and (9) oil immersing. The method disclosed by the invention can carry out controllable ion penetrating (PIP) treatment on the oil tube to form multiple compound penetrating layers on the surface of the oil tube, so that good mechanical performance is achieved and service life of the oil tube is prolonged while the corrosion resistance is improved, and therefore, the method has good practical application effect.

Description

technical field [0001] The invention relates to the petroleum field, in particular to a method for improving the corrosion resistance of oil pipes. Background technique [0002] The tubing has been buried underground for a long time and is corroded by various corrosive media. Moreover, due to the different geological conditions in various places, the corrosion of tubing is also different. The commonly used anti-corrosion methods are: 1) metal coating anti-corrosion methods, such as galvanizing, chrome plating, etc.; Infiltration of non-metallic elements, such as infiltration of aluminum, chromium, sulfur, nitrogen, boron and other elements; 4) electrochemical anti-corrosion method; 5) method of preventing microbial corrosion. Among the above anti-corrosion methods, the method of coating with non-metallic materials is widely used and the effect is better. [0003] Infiltrating metal and non-metallic elements into the metal surface to improve corrosion resistance has long be...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C23C12/00C23C8/36C23C28/00
CPCC23C12/00F16L58/04
Inventor 罗德福漆世荣李信鲁伟员王强
Owner 四川中久红宇科技有限公司
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