Novel bactericide for oil fields

Abstract

The invention relates to a novel bactericide for oil fields. The novel bactericide is prepared from the following raw materials, by weight, 55-65 parts of dodecyl dimethyl benzyl ammonium chloride (1227), 18-22 parts of water, 8-12 parts of a didecyl quaternary ammonium salt, 4-6 parts of bronopol, and 4-7 parts of glutaraldehyde. The novel bactericide is prepared through placing 1227 and water in a reaction vessel in order under normal temperature and normal pressure conditions, adding the didecyl quaternary ammonium salt with stirring, uniformly mixing, slowly adding bronopol and glutaraldehyde, and stirring for 20-30min. The effective content of the selected didecyl quaternary ammonium salt is equal to or greater than 30.0%. The novel bactericide which has good water solubility and has an extremely good corrosion resistance to metals has a sterilization rate of above 95%. The novel bactericide of the invention can be evaluated as a standard reaching product according to "a method for evaluating performances of a bactericide" of a petroleum standard SY / T5890-93.

Description

technical field [0001] The invention relates to a bactericide for reinjection water in oilfields, in particular to screening and modification. The obtained product has strong bactericidal performance, good water solubility and strong corrosion inhibition effect on metals. Background technique [0002] Water injection oil production is a measure commonly used in my country to increase crude oil production, but the problem of bacteria in oil injection water is universal, especially sulfate reducing bacteria (SRB) and saprophytic bacteria (TGB), which often cause corrosion of water injection equipment, and in severe cases Cause ground blockage. Therefore, sterilization and anticorrosion become more important in the process of oil recovery and water injection. The common method is to add fungicides to the reinjection water. This method is simple and quick, but only one kind of fungicides is used in a large amount. After a certain period of use, microorganisms can often develop ...

AI Technical Summary

Problems solved by technology

The common method is to add fungicides to the reinjection water. This method is simple and quick, but only one kind of fungicides is used in a large amount. After a certain period of use, microorganisms can often develop resistance to it, resulting in its bactericidal ability. Decrease gradually, making the water quality complicated

Most of the fungicides used at this stage are single chlorine-based fungicides or quaternary ammonium salt fungicides, such as a compound fungicide for water treatment and its preparation method described in the patent application number 02129629.4, which is widely used today Bactericides, long-term use will not only make bacteria resistant, but also aggravate the corrosion of equipment and pipelines due to the introduction of a large amount of chloride ions; at the same time, for example, the bactericide modified quaternary ammonium salt (2) and its preparation with application number 99114321.3 The bactericide described in the method is not only complicated to make, but also has high cost, and a single medicament can easily cause bacteria to develop drug resistance.

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