High-temperature corrosion inhibitor for acidification

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...

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 system during construction; The more the amount of corrosion inhibitor is added, there is also a risk of flammability in high temperature and hot weather, and the cost of the corrosion inhibitor formulated with methanol will also increase accordingly

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