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Corrosion inhibitor and preparation method thereof

A technology of corrosion inhibitor and Mannich base, used in chemical instruments and methods, earthwork drilling, wellbore/well components, etc. And other issues

Active Publication Date: 2015-12-16
CHINA PETROLEUM & CHEM CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In the actual application process, pitting corrosion and pit corrosion will still occur in corrosion-resistant pipes, and the strength can no longer meet the production needs within the safe service life
Although corrosion inhibitors are widely used, corrosion inhibitors that are resistant to high temperatures in high-salinity environments are still rare. At present, the highest temperature resistance of domestic corrosion inhibitors is 150°C, which is difficult to meet the requirements of high-temperature oil and gas wells such as Yuanba and Tahe. Corrosion Inhibition Demand

Method used

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  • Corrosion inhibitor and preparation method thereof

Examples

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preparation example Construction

[0032] Specifically, the preparation method of the Mannich base includes the following steps:

[0033] (1) Add 1 part by weight of N-methylaniline to a three-necked flask and heat it to 80°C with an electric heating mantle. Use concentrated hydrochloric acid to adjust the pH to 2; in addition to adjusting the pH, the concentrated hydrochloric acid also acts as a catalyst ;

[0034] (2) Heat the flask to 95°C, add 1 part by weight of acetone to the flask, and heat to 150°C;

[0035] (3) Add 0.5 parts by weight of formaldehyde and 0.5 parts by weight of benzaldehyde to the flask, keep the temperature at 150°C, and reflux for 4 hours under stirring to obtain Mannich base;

[0036] Wherein, the above steps are all carried out under reflux of the condenser. Steps (1) and (2) adopt reflux of the condenser. On the one hand, the temperature in the flask can be kept constant, and on the other hand, the components in the flask can be prevented from volatilizing.

[0037] Preferably, the preparat...

Embodiment 1

[0049] Example 1 Preparation of Mannich base

[0050] Add 10g of N-methylaniline to a 500ml three-necked flask. The equipment range is a thermometer, stirring device and reflux device at 200°C. Use an electric heating mantle to heat to 80°C, reflux, and adjust the pH of the solution to 2 with concentrated hydrochloric acid; Continue heating the solution to 95°C, add 10g of acetone to the flask and heat it to 150°C; add 5g of formaldehyde and 5g of benzaldehyde to the flask, keep the temperature at 150°C, reflux for 4 hours under stirring, and obtain Mannich base sample 1 #.

Embodiment 2

[0051] Example 2 Preparation of Mannich base

[0052] Add 10g of N-methylaniline to a 500ml three-necked flask with a thermometer, stirring device and reflux device with a range of 200°C. Use an electric heating mantle to heat to 80°C, reflux, and adjust the pH of the solution to 2 with concentrated hydrochloric acid; The solution continues to be heated to 95°C, add 10g of acetone to the flask and heat to 150°C; add 5g of formaldehyde and 5g of benzaldehyde to the flask, keep the temperature at 150°C, reflux for 4 hours under stirring; cool the refluxed three-necked flask to At room temperature, pour all the contents into a 500ml beaker; put the stirring magnet into the beaker, heat it to 180℃ while stirring, keep the beaker at 180℃ for 3min, pour the contents of the beaker into a 500ml three-necked flask , Install the reflux device, reflux at a constant temperature of 180°C for 1 hour to obtain Mannich base sample 2#.

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Abstract

The invention relates to a corrosion inhibitor and a preparation method thereof. The corrosion inhibitor comprises, by weight: 50-70% of Mannich base, 10-20% of phosphate, 10-20% of isopropanol, and 10-20% of sodium molybdate. The preparation method of the corrosion inhibitor comprises: adding N-methylaniline into a three-neck flask, heating the flask to 80 DEG C, and adjusting the pH value to 2 with concentrated hydrochloric acid; heating the flask to 95 DEG C, adding acetone into the flask, and heating the flask to 150 DEG C; adding formaldehyde and benzaldehyde into the flask, maintaining the temperature at 150 DEG C, and performing reflux for 4h while performing stirring to obtain Mannich base; and compounding, by weight, 50-70% of Mannich base, 10-20% of phosphate, 10-20% of isopropanol, and 10-20% of sodium molybdate to prepare the corrosion inhibitor. The corrosion inhibitor can be used at a high temperature of 180 DEG C. When the concentration of the corrosion inhibitor is 100 ppm, an N80 iron sheet is corroded by stratum water of the Tahe Oilfield for 6h at 180 DEG C, and the corrosion inhibition rate is 90.04%.

Description

Technical field [0001] The invention relates to the technical field of oil and gas field development, in particular to a water-soluble corrosion inhibitor and a preparation method thereof. Background technique [0002] The exploitation of ultra-deep and high-temperature oil and gas resources has always been a worldwide problem, with high mining costs and low economic benefits. If the oil and gas resources are accompanied by corrosive gases such as hydrogen sulfide and carbon dioxide, oil and gas well pipe strings and gathering lines will face severe corrosion. problem. [0003] At present, there are two main ideas to solve the corrosion problem. One is to change the material of the oil and gas well string to make it corrosion-resistant or lined with anti-corrosion pipes; the other is to use corrosion inhibitors. In the actual application process, corrosion-resistant pipes will still show pitting and pitting corrosion, and the strength cannot meet the production needs within the sa...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09K8/54
CPCC09K8/54C09K2208/32
Inventor 王雷何晓庆何龙杨祖国钱真李淑杰丁保东欧阳冬王娜胡歧川甄建伟黄江涛
Owner CHINA PETROLEUM & CHEM CORP
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