Compound bactericide used in oilfield flooding

Abstract

The invention provides a compound bactericide used in oilfield flooding, relating to oilfield water treatment. The bactericide comprises the following components by weight percent: 60-70% of deionized water, 2-5% of surfactant, 25-30% of organic aldehyde and 5-10% of cyanogen-containing compound. The bactericide used in oilfield flooding can act under the conditions of high hardness, high alkalinity and high temperature, has stable chemical properties, has terrific treatment effects on iron bacteria, also has a stronger effect of stripping slime layers, has the advantages of high efficiency, low toxicity, difficulty in being affected by change of the pH value, good compatibility with other water treatment agents, lower amount of admixture and the like and can be widely used in the fields of oilfield flooding and sewage treatment in the oilfield industry.

Description

technical field [0001] The invention relates to the field of water treatment, in particular to a fungicide for oilfield water injection. Background technique [0002] Iron bacteria are widespread in freshwater containing iron, an aerobic, and neutrophil environment. Because it can oxidize ferrous hydroxide dissolved in water, deposit it in the form of high-valent iron, and play the role of concentrating and accumulating iron in the environment. In oilfield water, if iron bacteria grow in large quantities, a large amount of iron hydroxide = layer covering the metal surface will be produced. It causes the diameter of metal pipes to shrink or block, reducing water flow, causing electrical corrosion and providing favorable growth conditions for other bacteria. In the process of water injection, since the temperature and environment of water injection are suitable for the growth and reproduction of iron bacteria, during the process of growth, metabolism and reproduction, it can...

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Problems solved by technology

[0003] Iron bacteria is a kind of aerobic heterotrophic bacteria. The growth of this bacteria requires organic matter and prefers organic compounds of iron and manganese. In the process of oil water injection, there are a large amount of organic matter to meet the growth needs of iron bacteria, and the iron bacteria multiply too much. It will cause blockage of water injection wells and filters. At the same time, it will also produce oxygen concentration batteries, which will cause corrosion of equipment and pipelines, and provide an environment for the survival and reproduction of sulfate-reducing bacteria, etc.

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