Corrosion inhibitor for water quality of high salt and weak acid oil field with chloride ion content of more than 50,000 ppm

A technology with chloride ion content and high salt content, which can be used in drilling compositions, chemical instruments and methods, etc., and can solve problems such as research and fewer products.

Active Publication Date: 2022-07-29
XIAN ZHONGRUI PETROCHEM TECH CO LTD
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] In recent years, for those containing dissolved oxygen, containing H 2 S, containing CO 2 , High-salt oilfield water quality research and products have been a lot, but there are relatively few researches and products on high-salt oilfield water quality with high chloride ion content, especially for high There are basically no salt water products

Method used

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  • Corrosion inhibitor for water quality of high salt and weak acid oil field with chloride ion content of more than 50,000 ppm
  • Corrosion inhibitor for water quality of high salt and weak acid oil field with chloride ion content of more than 50,000 ppm
  • Corrosion inhibitor for water quality of high salt and weak acid oil field with chloride ion content of more than 50,000 ppm

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0016] Dissolve 5g of ammonium molybdate, 2g of disodium EDTA, and 8g of sodium hexametaphosphate in water to prepare a solution. The quinoline quaternary ammonium salt is a synthetic product of quinoline and chloroacetic acid, and the synthesis process is as follows: the mol ratio of quinoline and chloroacetic acid is 1: 1.05, and quinoline is added in the there-necked flask equipped with reflux condenser, agitator and thermometer, Then, under stirring, chloroacetic acid was added dropwise, and the temperature was raised to 110° C. and reacted for 4 hours. After the reaction, the temperature was lowered to obtain a crude product. Then, isopropanol was used as a solvent for recrystallization, and the quinoline quaternary ammonium salt product was obtained after filtration and drying. The imidazoline quaternary ammonium salt is a synthetic product of oleic acid, diethylenetriamine and chloroacetic acid, and the synthesis process is as follows: the molar ratio of oleic acid, diet...

Embodiment 2

[0018] Dissolve 3g sodium molybdate, 3g sodium gluconate and 12g disodium hydrogen phosphate in water to make a solution, then add 5g peregal plus O-25 and 3g propargyl alcohol and fully stir and dissolve, the quinoline quaternary ammonium salt For quinoline and chloroacetic acid synthesis product, the synthesis process is as follows: the mol ratio of quinoline and chloroacetic acid is 1: 1.10, in the there-necked flask equipped with reflux condenser, agitator and thermometer, add quinoline, then dropwise under stirring Chloroacetic acid was heated to 120° C. and reacted for 6 hours. After the reaction was completed, the temperature was lowered to obtain a crude product. Then, isopropanol was used as a solvent for recrystallization and filtration and drying to obtain a quinoline quaternary ammonium salt product. The imidazoline quaternary ammonium salt is a synthetic product of oleic acid, diethylenetriamine and chloroacetic acid, and the synthesis process is as follows: the mo...

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Abstract

The invention relates to a corrosion inhibitor for high-salt and weakly acidic oilfield water quality with a chloride ion content of more than 50,000 ppm. It is prepared from the following components by weight percentage: phosphate: 8-12%, dispersant: 1 ‑3%, Molybdate: 1‑5%, Quinoline Quaternary Ammonium Salt: 3‑5%, Imidazoline Quaternary Ammonium Salt: 10‑20%, Alkynol: 2‑5%, Perepine O‑25: 3 ‑5%, organic amines: 8‑12%, water: 33‑64%. Among the above components, phosphate and dispersant act to precipitate and disperse scale ions to avoid corrosion under scale. Molybdate, quinoline quaternary ammonium salt, imidazoline quaternary ammonium salt, alkynol and organic amine play a role in corrosion inhibition. The effective concentration of the present invention can reach 41-51%, and is especially suitable for containing Ca 2+ , Mg 2+ , Na + and Cl ‑ In the weakly acidic water environment with high salt and high chlorine content, it has excellent corrosion inhibition performance, especially for the pitting corrosion phenomenon of chloride ions.

Description

technical field [0001] The invention relates to a corrosion inhibitor for water quality of high-salt and weakly acidic oilfields with a chloride ion content of more than 50,000 ppm. Background technique [0002] In recent years, most of my country's oil fields have entered a period of high water-cut production. The corrosion of oil wells, pipelines and ground equipment has become more and more serious. The operating conditions of oil field equipment are mainly to bear the load and the environment. The harsh operating environment makes corrosion a damage to oil fields. One of the main reasons for the device. Corrosion not only makes the oilfield production stop production and production, but also can directly destroy and scrap oilfield equipment in severe cases. Corrosion has become one of the obstacles to the development of the petroleum industry, which seriously affects the safety and economy of oilfield production. [0003] In recent years, for dissolved oxygen, H 2 S, c...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C23F11/04
CPCC23F11/04C09K8/54C23F11/08C09K2208/32
Inventor 高伟沈哲
Owner XIAN ZHONGRUI PETROCHEM TECH CO LTD
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