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Corrosion inhibitor for acid liquor as well as preparation and application of corrosion inhibitor

A corrosion inhibitor and acid liquid technology, applied in chemical instruments and methods, wellbore/well parts, earthwork drilling and production, etc., can solve problems such as oil and gas well pipes and downhole metal equipment corrosion, accidents and economic losses, formation damage, etc.

Active Publication Date: 2022-05-06
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 deep well reservoir transformation and acidizing construction, as the depth increases, the temperature becomes higher and higher, and the injection of acid liquid may cause corrosion of oil and gas well tubing and downhole metal equipment, causing serious accidents and economic losses. Metallic iron ions may cause damage to the formation

Method used

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  • Corrosion inhibitor for acid liquor as well as preparation and application of corrosion inhibitor
  • Corrosion inhibitor for acid liquor as well as preparation and application of corrosion inhibitor
  • Corrosion inhibitor for acid liquor as well as preparation and application of corrosion inhibitor

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0038] 5 copies;

[0039] Among them, R 1 is phenyl, R 2 Cyclohexyl, R 3 is phenyl, R' is methyl, R" is H, R"' is phenyl, 40 parts;

[0040] Polyoxymethylene dimethyl ether (DMMn, n=5-8), 20 parts;

[0041] Potassium pyroantimonate takes 3 parts;

[0042] Nano zinc powder (average particle diameter less than 100nm), 3 parts.

[0043] The preparation process of compound shown in formula (2) is as follows:

[0044] Add a certain amount of N-cyclohexylaniline into a four-necked flask equipped with a stirrer, reflux condenser, and thermometer, adjust the pH to acidity with hydrochloric acid, and start heating to raise the temperature. When the temperature rises to 90°C, slowly add acetophenone, Continue to raise the temperature to 120° C., and start to add benzaldehyde solution dropwise. After the dropwise addition, carry out constant temperature reaction at a certain temperature for 8 hours to obtain aldehyde, ketone, and amine condensation products, that is, Mannich ba...

Embodiment 2

[0050] Take 5 copies;

[0051] where, where, R 1 is phenyl, R 2 Cyclohexyl, R 3 is phenyl, R' is methyl, R" is H, R"' is phenyl, 40 parts;

[0052] Take 20 parts of polymethoxy dimethyl ether (DMMn, n=5-8);

[0053] Take 1 part of potassium pyroantimonate;

[0054] Nano zinc powder (average particle diameter less than 100nm) takes 3 parts.

[0055] The preparation process of compound shown in formula (2) is as follows:

[0056] Add a certain amount of N-cyclohexylaniline into a four-necked flask equipped with a stirrer, reflux condenser, and thermometer, adjust the pH to acidity with hydrochloric acid, and start heating to raise the temperature. When the temperature rises to 90°C, slowly add acetophenone, Continue to raise the temperature to 120° C., and start to add benzaldehyde solution dropwise. After the dropwise addition, carry out constant temperature reaction at a certain temperature for 8 hours to obtain aldehyde, ketone, and amine condensation products, that...

Embodiment 3

[0060] Take 5 copies;

[0061] Among them, R 1 is phenyl, R 2 Cyclohexyl, R 3 is phenyl, R' is methyl, R" is H, R"' is phenyl, 40 parts;

[0062] Take 20 parts of polymethoxy dimethyl ether (DMMn, n=5-8);

[0063] Potassium pyroantimonate takes 3 parts;

[0064] Nano zinc powder (average particle diameter is less than 100nm) gets 3 parts;

[0065] Take 1 part of sodium dodecylbenzenesulfonate;

[0066] Take 5 parts of cuprous iodide.

[0067] The preparation process of compound shown in formula (2) is as follows:

[0068] Add a certain amount of N-cyclohexylaniline into a four-necked flask equipped with a stirrer, reflux condenser, and thermometer, adjust the pH to acidity with hydrochloric acid, and start heating to raise the temperature. When the temperature rises to 90°C, slowly add acetophenone, Continue to raise the temperature to 120° C., and start to add benzaldehyde solution dropwise. After the dropwise addition, carry out constant temperature reaction at a...

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Abstract

The invention discloses a corrosion inhibitor for acid liquor, which is prepared from the following components in parts by weight: 5 to 10 parts of isothiazolinone derivative and 30 to 40 parts of Mannich base compound. The invention further discloses a preparation method and application of the corrosion inhibitor for the acid liquor. According to the high-temperature acidizing corrosion inhibitor, nitrogen-containing and sulfur-containing electron-rich heterocycles and polyoxymethylene dimethyl ether compounds are used as corrosion inhibitor core auxiliaries, antimony oxide and copper iodide corrosion inhibition auxiliaries and an iron ion stabilizer are matched, and the requirement for acidizing transformation construction of an ultra-high-temperature deep well at the temperature of 200 DEG C or above can be met.

Description

technical field [0001] The invention relates to a corrosion inhibitor for acid liquid and its preparation and application. Background technique [0002] In the process of oil extraction, in order to improve the recovery rate of oil and gas wells, it is necessary to use acidifying agent, that is, acid liquid. Although the use of acid liquid improves the recovery rate of oil and gas wells, it is also easy to cause corrosion of metal equipment such as oil well tubing, which in turn brings about safety issues, production cost issues, and environmental pollution issues. The main method to solve the above problems caused by acid solution is to add corrosion inhibitor. Corrosion inhibitors are substances that inhibit or reduce the rate of corrosion. At present, the common acid system is suitable for reservoirs and generally does not exceed 180 °C. In deep well reservoir transformation and acidizing construction, as the depth increases, the temperature becomes higher and higher, ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09K8/54C09K8/74
CPCC09K8/54C09K8/74C09K2208/32
Inventor 蒋其辉杨向同王永红叶禹刘建全乔岩张晔
Owner BC P INC CHINA NAT PETROLEUM CORP
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