High-temperature acidifying inhibiter and preparation method thereof

Abstract

The invention relates to a high-temperature acidifying inhibiter and a preparation method thereof. The high-temperature acidifying inhibiter comprises the following materials in parts by weight: 79.33-87.68 of ethanol, 19-21 of methanoic acid, 22.33-24.68 of aniline, 31.11-34.39 of acetophenone, 26.13-28.88 of methanal, 31.54-34.86 of benzyl chloride and 8.55-9.45 of propiolic alcohol, wherein theethanol, the methanoic acid and the aniline are placed into a reaction kettle to be stirred; then the acetophenone is added into the reaction kettle; then a methanal solution is dripped into the reaction kettle; the benzyl chloride is added into the reaction kettle after the methanal solution is dripped into the reaction kettle; the temperature of the reaction kettle is reduced to room temperature, and then the propiolic alcohol is added into the reaction kettle to be stirred. The water content inside the reaction kettle is low without adding an aqueous hydrochloric acid solution so as to prevent the benzyl chloride from hydrolyzing and be beneficial to reducing the unit consumption of the benzyl chloride in the quaterisation reaction process; before the methanal is completely dripped, the amount of the methanal dripped into the reaction kettle is less than the reaction mole ratio of synthetic Mannich base, the methanal is in an insufficient state so as to reduce the volatilization ofthe methanal, ensure the health of operators and be 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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