High temperature corrosion inhibitor for acidification

Abstract

The invention discloses a high-temperature corrosion inhibitor for acidification, which comprises, by mass fraction, 30-40% of a main corrosion inhibitor, 10-17% of an emulsifier, 5.5-9% of a high-temperature synergist, 5-10 % carbon number is C 6 ~C 10 The linear acetylenic diol and the balance of water; the main corrosion inhibitor is a mixture of polyaspartic acid and a mixture of aldehydes, ketones, and amines; the mixture of aldehydes, ketones, and amines is composed of formaldehyde, The mixed solution produced by polycondensation reaction of ketone and polyethylene polyamine, or the mixed solution produced by polycondensation reaction of formaldehyde, cyclohexanone and polyethylene polyamine; the high-temperature synergist is a mixture of metal oxide and alkali metal organic salt; The high-temperature corrosion inhibitor for acidification has a temperature resistance of 160-180 °C, and has good corrosion inhibition performance. It uses water as a solvent instead of methanol as a solvent in traditional corrosion inhibitors, making the high-temperature corrosion inhibitor for acidification more efficient. Green and environmentally friendly, the product performance is safe and reliable, and it is 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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