Preparation method of acidizing corrosion inhibitor in high-temperature and concentrated acid environment

An acidified corrosion inhibitor, high temperature technology, applied in the field of acidified corrosion inhibitor preparation, can solve the problems of poor dispersibility, easy coking and other problems, achieve excellent corrosion inhibition effect, reduce side reactions, good solubility and dispersibility. Effect

Inactive Publication Date: 2016-03-23
SOUTHWEST PETROLEUM UNIV
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  • Abstract
  • Description
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  • Application Information

AI Technical Summary

Problems solved by technology

[0003] Purpose of the present invention: In order to overcome the problems of the existing high-temperature acidification corrosion inhibitors in use, such as solubility, poor dispersibility, and easy coking, and to improve the high-temperature resistance of acidification corrosion inhibitors, a special method for high-temperature concentrated acid corrosion inhibitors is provided. Preparation method of acidification corrosion inhibitor in environment

Method used

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  • Preparation method of acidizing corrosion inhibitor in high-temperature and concentrated acid environment
  • Preparation method of acidizing corrosion inhibitor in high-temperature and concentrated acid environment

Examples

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Effect test

example 1

[0017] Example 1: A kind of preparation, dissolution dispersibility and storage performance measurement of acidification corrosion inhibitor used in high temperature concentrated acid environment, its specific steps are as follows:

[0018] The first step "two-step method" synthesizes the Mannich base intermediate, using formaldehyde, benzylamine, and acetophenone as raw materials, wherein the molar ratio of the monomer raw materials used is: formaldehyde: benzylamine: acetophenone=1 ~1.2:1~1.2:1. First add 7.20g of formaldehyde, 25.68g of benzylamine, 20ml of absolute ethanol as a solvent, 6ml of concentrated hydrochloric acid as a catalyst, in a three-necked flask equipped with a thermometer, a serpentine condenser and a stirrer and an oil bath at 110°C React in the pot, the reaction time is 2h, then add 24.00g of acetophenone, slowly add concentrated hydrochloric acid dropwise to adjust the pH value of the system to 4, react at the same temperature and stirring speed for 4h...

example 2

[0023] Example 2: a kind of preparation method and corrosion inhibition performance measurement of the acidification corrosion inhibitor used in high temperature concentrated acid environment, its concrete steps are as follows:

[0024] The first step "two-step method" synthesizes the Mannich base intermediate: take formaldehyde, benzylamine and acetophenone as raw materials, wherein the molar ratio of the monomer raw materials used is: formaldehyde: benzylamine: acetophenone=1 ~1.2:1~1.2:1. First add 6.90g of formaldehyde, 24.61g of benzylamine, 20ml of absolute ethanol as a solvent, 6ml of concentrated hydrochloric acid as a catalyst, in a three-necked flask equipped with a thermometer, a serpentine condenser and a stirrer and an oil bath at 110°C React in the pot, the reaction time is 2h, then add 24.00g of acetophenone, slowly add concentrated hydrochloric acid dropwise to adjust the pH value of the system to 4, react at the same temperature and stirring speed for 4h, and ...

example 3

[0034] Example 3: A kind of preparation method and the morphology observation of the acidification corrosion inhibitor used in the high temperature concentrated acid environment, its concrete steps are as follows:

[0035] The first step "two-step method" synthesizes the Mannich base intermediate: formaldehyde, benzylamine and acetophenone are used as raw materials, and the molar ratio of the monomer raw materials used is: formaldehyde: benzylamine: acetophenone=1~ 1.2:1~1.2:1. First add 6.00g of formaldehyde, 21.40g of benzylamine, 20ml of absolute ethanol as a solvent, 6ml of concentrated hydrochloric acid as a catalyst, in a three-necked flask equipped with a thermometer, a serpentine condenser and a stirrer and an oil bath at 110°C React in the pot, the reaction time is 2h, then add 24.00g of acetophenone, slowly add concentrated hydrochloric acid dropwise to adjust the reaction pH value to 4, react at the same temperature and stirring speed for 4h, and obtain the crude Ma...

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Abstract

The invention relates to a preparation method of acidizing corrosion inhibitor in a high-temperature and concentrated acid environment. The preparation method is used for an acidification technology in carbonate oil reservoir exploration and overcomes the problem that existing high-temperature acidification corrosion inhibitor is poor in solubility and dispersion in use and prone to coking. According to the technical scheme, firstly, formaldehyde, benzene methanamine, absolute ethyl alcohol and concentrated hydrochloric acid are added into a three-necked flask, and then the three-necked flask is placed into an oil bath pan with the temperature being 110 DEG C for conducting a reaction for 2 hours; then, acetophenone is added, the pH is adjusted to 4 through concentrated hydrochloric acid, a reaction is conducted for 4 hours, and a coarse mannich base is obtained; thirdly, a vacuum rotary evaporation instrument is utilized for purification, separation is conducted, and a mannich base intermediate is obtained; fourthly, after the intermediate obtained in step 3 is washed, benzyl chloride is added, a reaction is conducted for 6 hours at the temperature of 110 DEG C, evaporation and separation are conducted through the vacuum rotary evaporation instrument, and mannich base quaternary ammonium salt is obtained; finally, potassium iodide is added in the mannich base quaternary ammonium salt stirring process for conducting mixed distribution, and the high-temperature acidizing corrosion inhibitor is obtained. The acidizing corrosion inhibitor has good solubility and dispersion, can further improve corrosion inhibition efficiency and is good in stability.

Description

technical field [0001] The invention belongs to the field of petroleum exploitation chemistry, and relates to a preparation method of an acidification corrosion inhibitor used in an acidification process in the development process of carbonate reservoirs in a high-temperature concentrated acid environment. technical background [0002] In the development of oil and natural gas, acidification technology is often used to increase production. In the process of acidizing construction, acid injection will cause surface pitting, hydrogen embrittlement cracking and even brittle fracture of oil and gas well tubing and downhole equipment, and sometimes may cause sudden rupture of downhole tubing, causing serious economic losses; Reactive metallic iron ions may also cause permanent damage to the formation. When acidizing high-temperature deep wells and ultra-deep wells with a large amount of acid, the corrosion protection of tubing and equipment must be considered. Acidizing corrosi...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09K8/74C09K8/68
CPCC09K8/74C09K8/68C09K2208/32
Inventor 王霞陈玉祥陈月峰罗太元郭晨辉李后国时圣闯王岚刘志辉吴艺琛
Owner SOUTHWEST PETROLEUM UNIV
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