A kind of high temperature acidifying corrosion inhibitor and preparation method thereof

Abstract

The invention relates to a high-temperature acidification corrosion inhibitor and a preparation method thereof, comprising the following materials: 79.33-87.68 parts of ethanol, 19-21 parts of formic acid, 22.33-24.68 parts of aniline, 31.11-34.39 parts of acetophenone, and 26.13-28.88 parts of formaldehyde , 31.54-34.86 parts of benzyl chloride and 8.55-9.45 parts of propynyl alcohol, place ethanol, formic acid and aniline in the reaction kettle and stir, then add acetophenone into the reaction kettle, and then drop formaldehyde solution into the reaction kettle After adding the formaldehyde solution dropwise, add benzyl chloride into the reactor, lower the temperature of the reactor to room temperature, then add propynyl alcohol and stir. No need to add hydrochloric acid aqueous solution, the water content in the reactor is low, avoiding the hydrolysis of benzyl chloride, which is beneficial to reduce the unit consumption of benzyl chloride in the process of quaternization reaction, before adding formaldehyde dropwise, drop into the reactor The amount of formaldehyde is lower than the reaction molar ratio of synthetic Mannich base, and the formaldehyde is in a state of insufficient amount, which reduces the volatilization of formaldehyde, ensures the health of operators, and is safer.

Description

technical field [0001] The invention relates to a high-temperature acidification corrosion inhibitor and a preparation method thereof, which belong to the technical field of oil field chemical industry. Background technique [0002] In oil field construction, fracturing and acidizing is a very important oil production stimulation measure. Almost every oil production well has to go through this process. The commonly used acidizing agent is 20% hydrochloric acid or a compound of hydrochloric acid and hydrofluoric acid. Soil acid, these two acids are very strong inorganic acids, which will lead to corrosion of downhole pipe strings and metal equipment, and with the increase of well depth, the temperature will increase, which will inevitably lead to more serious corrosion. To prevent or reduce the corrosion of downhole tubing string by acid liquid at high temperature, it is necessary to add a high temperature corrosion inhibitor into the acid liquid. [0003] At present, common...

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Problems solved by technology

[0004] During the reaction process, since the formaldehyde is in a sufficient state, it will inevitably cause the volatilization of formaldehyde. Usually, the consumption of formaldehyde is about 0.1255 tons for every ton of corrosion inhibitor produced, which is relatively large and the production cost is high. , the formaldehyde volatilized into the air has caused great damage to the health of the operators, and the production process is unsafe

[0005] In the production process, it is also necessary to add benzyl chloride and hydrochloric acid aqueous solution to the reaction kettle, resulting in relatively high moisture content in the reaction kettle, and benzyl chloride will undergo hydrolysis reaction, which increases the concentration of benzyl chloride in the quaternization reaction process. Unit consumption reduces the yield of the entire reaction. Usually, about 0.2066 tons of benzyl chloride is consumed for every ton of corrosion inhibitor produced, and the production cost is high.

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