High-temperature corrosion inhibitor for acidification

A high-temperature corrosion inhibitor and corrosion inhibition technology, applied in the direction of chemical instruments and methods, drilling compositions, etc., can solve the problems of poor compatibility between corrosion inhibitors and acid liquid systems, increased cost of corrosion inhibitors, etc., and achieve product performance Safe and reliable, reducing the risk of flammability, and convenient transportation

Active Publication Date: 2020-08-28
CNPC BOHAI DRILLING ENG +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Taking methanol as an example of a corrosion inhibitor commonly used as a solvent, the weight fraction of methanol in the corrosion inhibitor accounts for about 50%, which results in poor compatibility between the corrosion inhibitor and the acid sy

Method used

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  • High-temperature corrosion inhibitor for acidification
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  • High-temperature corrosion inhibitor for acidification

Examples

Experimental program
Comparison scheme
Effect test

Example Embodiment

[0023] Example 1

[0024] A kind of preparation method of high temperature corrosion inhibitor, its steps are as follows:

[0025] 1) Preparation of mixed solution containing aldosterone amine polycondensate: add 70 g of formaldehyde and 300 g of acetophenone into the reaction flask, then add 2 mL of 37.5 wt. The temperature was raised to 90°C at a speed of 2min / °C, kept for 4h, then dropped to room temperature and left for stratification for 4h, the lower layer of water was separated, and the upper layer product was an aldehyde-ketone polycondensate; then, at room temperature and at 0.5~1r / s 200g of polyethylene polyamine (number-average molecular weight: 3000) was added dropwise to the solution state aldehyde and ketone polycondensate under the stirring speed of When it is lowered to room temperature, the obtained product is the mixed solution containing the aldosterone amine polycondensate; after testing, the molecular weight of the aldosterone amine polycondensate in the ...

Example Embodiment

[0027] Example 2

[0028] A kind of preparation method of high temperature corrosion inhibitor, its steps are as follows:

[0029] 1) Prepare a mixed solution containing aldosterone amine polycondensate: add 32 g of formaldehyde and 120 g of acetophenone into the reaction flask, then add 2 mL of 37.5 wt. The temperature was raised to 80°C at a speed of 2min / °C, kept for 5h, and then dropped to room temperature for 4.5h. Under the stirring speed of s, 450g of polyethylene polyamine (number average molecular weight is 4200) was added dropwise to the solution state aldehyde and ketone polycondensate. After cooling down to room temperature, the obtained product is a mixed solution containing aldosterone amine polycondensate; after testing, in the mixed solution containing aldosterone amine polycondensate, the molecular weight of aldosterone amine polycondensate is 3500;

[0030] 2) In parts by weight, 26 parts of mixed solutions containing aldosterone amine polycondensate, 4 par...

Example Embodiment

[0031] Example 3

[0032] A kind of preparation method of high temperature corrosion inhibitor, its steps are as follows:

[0033]1) Prepare a mixed solution containing aldosterone amine polycondensate: add 150 g of formaldehyde and 120 g of cyclohexanone to the reaction flask, then add 2 mL of 37.5 wt. The temperature was raised to 90°C at a speed of 2min / °C, kept for 4h, then dropped to room temperature and left for stratification for 5h, the lower layer of water was separated, and the upper layer product was an aldehyde-ketone polycondensate; then, at room temperature and at 0.5~1r / s 270g of polyethylene polyamine (number-average molecular weight: 3800) was added dropwise to the solution aldehyde and ketone polycondensate under the stirring speed of When it is lowered to room temperature, the obtained product is the mixed solution containing the aldosterone amine polycondensate; after testing, in the mixed solution containing the aldosterone amine polycondensate, the molec...

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Abstract

The invention discloses a high-temperature corrosion inhibitor for acidification. The high-temperature corrosion inhibitor comprises the following components in percentage by mass: 30-40% of a corrosion inhibition main agent, 10-17% of an emulsifier, 5.5-9% of a high-temperature synergist, 5-10% of C6-C10 straight-chain alkynediol and the balance of water, wherein the corrosion inhibition main agent is a mixture of a mixed solution containing aldehyde ketone amine polycondensate and polyaspartic acid; the mixed solution containing the aldehyde ketone amine condensation polymer is a mixed solution generated by condensation polymerization of formaldehyde, acetophenone and polyethylene polyamine, or a mixed solution generated by condensation polymerization of formaldehyde, cyclohexanone and polyethylene polyamine; the high-temperature synergist is a mixture of a metal oxide and an alkali metal organic salt; the temperature resistance of the high-temperature corrosion inhibitor for acidification reaches 160-180 DEG C, the corrosion inhibition performance is good, water is adopted as a solvent to replace methanol which is mostly adopted as a solvent in a traditional corrosion inhibitor,and thus the high-temperature corrosion inhibitor for acidification is more environmentally friendly, safe and reliable in product performance and more convenient to transport.

Description

technical field [0001] The invention relates to the field of additives in the acidizing liquid system used in the process of increasing production of oil and gas wells, in particular to a high-temperature corrosion inhibitor for acidizing. Background technique [0002] Acidizing is a commonly used process in the process of oil and gas well stimulation, and acid liquid system is a commonly used liquid system in acidizing. No matter what kind of acid system is used as the well fluid, additives such as corrosion inhibitors must be added to the system to prevent corrosion of tubing and acidizing equipment. [0003] At present, whether the commonly used corrosion inhibitors on the market are high-temperature series corrosion inhibitors or medium-temperature series corrosion inhibitors, alcohols are mostly used as solvents to prepare corrosion inhibitors. Taking methanol as an example of a corrosion inhibitor commonly used as a solvent, the weight fraction of methanol in the corr...

Claims

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Application Information

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IPC IPC(8): C09K8/74C08G12/00
CPCC08G12/00C09K8/74
Inventor 刘音李欣苗红海周广龙张伟辉华亮王玉善刘位张国辉贺燕飞
Owner CNPC BOHAI DRILLING ENG
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