High temperature acidified corrosion inhibitor for oil passageway containing Cr

An acidification corrosion inhibitor and high temperature technology, which is applied in the field of high temperature acidification corrosion inhibitors, can solve the problems of inability to inhibit corrosion, corrosion, and failure to prevent acidification corrosion of Cr-containing materials.

Active Publication Date: 2009-06-10
BC P INC CHINA NAT PETROLEUM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In a strong acid environment, a passivation film is easily formed on the surface of ordinary carbon steel, and the acidizing corrosion inhibitor prevents further corrosion of the carbon steel by the acid solution. After adding the ordinary carbon steel acidizing corrosion inhibitor, the corrosion rate of the Cr-containing material is accelerated, indicating that the commonly used The corrosion inhibition film formed by carbon steel acidizing corrosion inhibitor cannot prevent the acidizing corrosion of Cr-containi

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0015] The composition of the main agent A is in parts by weight: 25 parts of quinoline quaternary ammonium salt, 5 parts of potassium iodide, and 40 parts of organic solvent methanol;

[0016] The composition of auxiliary agent B is: 30 parts of Mannich base, 15 parts of propynyl alcohol, 10 parts of chromium chloride, 20 parts of formaldehyde;

[0017] When in use, A:B=2:1 by weight, and after using traditional carbon steel acidizing corrosion inhibitor (use amount 5% mass concentration) at a temperature of 120°C, the corrosion rate of the super 13Cr pipe sample is 300g / m 2 For more than h, the surface of the sample is basically free from corrosion after adding a special acidifying corrosion inhibitor for pipes containing Cr (use amount 3% mass concentration).

Embodiment 2

[0019] The composition of the main agent A is in parts by weight: 35 parts of 2-methylquinoline quaternary ammonium salt, 10 parts of potassium iodide, and 60 parts of organic solvent formaldehyde;

[0020] The composition of auxiliary agent B is: 50 Mannich base, 35 propynol, 5 chromium chloride, 35 formaldehyde; the Mannich base is produced by reacting aniline, acetophenone and formaldehyde.

[0021] When using it, A:B=1.5:1 by weight, and use high-temperature acidification corrosion inhibitor containing Cr tubing on the super 13Cr pipe at 100°C. After the usage amount is 3% mass concentration, the surface of the sample is basically free from corrosion.

Embodiment 3

[0023] The composition of the main agent A is in parts by weight: 40 parts of 2-methylquinoline quaternary ammonium salt, 8 parts of potassium iodide, and 50 parts of organic solvent methanol;

[0024] The composition of auxiliary agent B is: 40 parts of Mannich base, 30 parts of propynyl alcohol, 10 parts of chromium chloride, and 30 parts of formaldehyde; the Mannich base is produced by reacting aniline, acetophenone and formaldehyde.

[0025] When in use, the parts by weight are A:B=1.8:1, and the temperature is 140°C. The high-temperature acidification corrosion inhibitor containing Cr tubing is used for super 13Cr pipes, and the corrosion rate is lower than 40g / m. 2 h, meet the requirements of the first-class standard.

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PUM

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Abstract

The invention relates to a high-temperature acidizing inhibiter containing a Cr oil pipe. A main agent A comprises the following compositions by weight portion: 25 to 35 portions of quinoline quaternary ammonium salt or quinoline derivate quaternary ammonium salt, 5 to 10 portions of potassium iodide, and 40 to 60 portions of organic solvent methanol or formaldehyde. An addition agent B comprises the following compositions by weight portion: 30 to 50 portions of Mannich base, 15 to 35 portions of propiolic alcohol, 5 to 15 portions of chromic chloride, and 20 to 35 portions of formaldehyde. During use, the proportion of A to B is 2-1.5:1 according to the weight portions, in an environment of 15 percent HCl+3 percent HF mud acid and 20 percent hydrochloric acid, inhibitions to super 13Cr at 100 DEG C, 120 DEG C and 140 DEG C all accord with acidizing standard requirement; and according to SY/T5405-1996 acidizing inhibiter performance test method and evaluating indicator, corrosion velocity of the inhibiter is lower than 40g/m<2>h at 140 DEG C. The inhibiter achieves the requirement of primary standard, and solves the problem of acidizing corrosion of Cr-contained steel in a high-temperature oil well.

Description

technical field [0001] The invention relates to a high-temperature acidification corrosion inhibitor used for Cr-containing oil pipes of petroleum and natural gas oil wells. Background technique [0002] In a high-temperature simulation environment, when acidifying Cr-containing pipes, after using carbon steel high-temperature acidification corrosion inhibitor, the local corrosion of the sample is very serious, and the minimum corrosion rate of hydrochloric acid at 80°C is 26.06g / (m2 h). There is a large area of ​​corrosion on the surface of the sample; the corrosion rate for soil acid is 100g / (m 2 h) above, far beyond the SY / T5405-1996 acidification corrosion inhibitor performance test method and evaluation index, the surface of the sample has a large area of ​​metal peeling, indicating that the acidification corrosion inhibitor for ordinary carbon steel has no effect on Cr-containing pipes Good corrosion inhibition effect. [0003] Commonly used acidifying corrosion inhi...

Claims

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Application Information

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IPC IPC(8): C23F11/04C22C38/18
Inventor 尹成先冯耀荣白真权霍春勇张娟涛
Owner BC P INC CHINA NAT PETROLEUM CORP
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