Abstract: Bronopol(CAS: 52-51-7) is a broad-spectrum and highly effective biocide that kills both bacteria and fungi. Bronopol can be dissolved in water and is widely used in water treatment, swimming pools, petrochemicals and other fields. Bronopol has the characteristics of fast bactericidal effect, strong antibacterial ability and safe use.

Keywords: Bronopol; CAS: 52-51-7; BNP; C3H6BrNO4; biocide; preservative; bactericide; fungicide

1.Physicochemical property

Appearance: White crystalline powder

Chemical name: 2-Bromo-2-nitro-1,3-propanediol(Bronopol-99)

Active ingredient: ≥99%

CAS No. : 52-51-7

Molecular formula: C3H6BrNO4

2.Application of Bronopol in oilfield water injection

Oilfield water injection means that in the process of oilfield exploitation, water injection equipment is installed in the water source, and the treated water is transported to the oilfield through the water pipeline to meet the needs of energy balance and pressure maintenance in the reservoir. Due to the complex environment in the reservoir and the difficult exploitation technology, the growth of bacteria, fungi and other microorganisms generated in the oil well is very easy to cause undesirable deposition of sediments and pollutants, resulting in reduced porosity of the oil well, difficult separation of oil and water, and even silting, which increases the maintenance and treatment costs. Therefore, adding Bronopol to oilfield injection water is of great significance for oilfield management and maintenance.

3.Use method and precautions

Bronopol biocide can be directly added to the water injection process for sterilization. The amount of Bronopol should be added according to the actual needs, and the best dosage should be determined after repeated trials. At the same time, in the process of use, you need to pay attention to the following points:

3.1Bronopol should be added in moderate amounts. The concentration is too low, can not achieve sterilization effect; If the concentration is too high, it may cause water pollution and cause adverse reactions.

3.2 In the case of long-distance water delivery, the effect of Bronopol biocides will decrease with the increase of time. Therefore, it is necessary to carry out segmented treatment for long-distance water transmission.

3.3 After adding Bronopol biocide, it is necessary to wait a certain amount of time for Bronopol biocide to fully react with water before the treated water pump is injected into the well injection system.

3.4Bronopol biocides are strong oxides and are prone to react with other drugs to produce adverse effects. Therefore, careful consideration is needed when choosing other drugs.