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

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...

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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

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