Corrosion and scale inhibitor for reinjection water of oil field and preparation method of corrosion and scale inhibitor

Abstract

The invention provides a corrosion and scale inhibitor, which belongs to the technical field of industrial water treatment. The corrosion and scale inhibitor is prepared from the following raw materials in parts by weight: 30 to 50 parts of calendic acid, 18 to 35 parts of glycerol, 12 to 25 parts of epoxysuccinic acid, 10 to 20 parts of acrylic acid, 5 to 15 parts of initiator, 30 to 50 parts of phosphono carboxylic acid copolymer and 5 to 10 parts of dodecyl dimethyl benzyl ammonium chloride. According to the corrosion and scale inhibitor, a corrosion and scale inhibiting effect for a reinjection water system under environments of high temperature, high mineralization degree and high corrosion can be effectively realized, and normal operation of water injection equipment and pipelines is guaranteed.

Description

Technical field: [0001] The invention belongs to the technical field of industrial water treatment, and relates to a corrosion and scale inhibitor for oilfield reinjection water used for tertiary oil recovery. Background technique: [0002] Water is the basis of human survival. With the progress of society, the rapid development of domestic petroleum and chemical industries, the use of large and super large heat exchange equipment in petrochemical, steel and other industries is becoming more and more serious. Therefore, the repeated use of water Utilization, the requirements for water treatment agents are getting higher and higher. With the gradual improvement of people's awareness of environmental protection, the concept of green antiscalants has been proposed and has become the current and future development direction. [0003] The water temperature of oilfield reinjection water is generally above 60°C, and the water quality is poor. The material of water injection equipm...

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Problems solved by technology

[0004] Most of the scale and corrosion inhibitors currently used are organophosphorus and polymers, and most of them are used in combination with corrosion inhibitors and scale inhibitors. These substances are prone to reactions in the oilfield reinjection water system with complex substances and high temperatures. As a result, the effect of scale and corrosion inhibition cannot reach the expected purpose. The invention can effectively inhibit the corrosion and scale of the reinjection water system in the environment of high temperature, high salinity and high corrosion, and ensure the normal operation of water injection equipment and pipelines.

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