Oil recovery reinjection water bactericide and application thereof

Abstract

The invention discloses an oil recovery reinjection water bactericide and an application thereof. The bactericide comprises dibromo nitrilotriacetic propionamide and halogenated hydantoin with a weight ratio of 200:1-20:1. The bactericide can be used in polymer flooding reinjection water. According to the bactericide provided by the invention, with a synergetic effect between monomers, hydrolysis stability is improved, such that potency is increased and is maintained stable. Therefore, oil recovery pipeline and stratum corrosion, fouling and blocking caused by bacteria and algae can be greatly relieved. Because of the compatibility of bactericide components and oil recovery additives, polymer flooding reinjection water viscosity can be substantially improved, such that polymer dose during polymer flooding can be greatly reduced, and oil recovery production stability and efficiency improvement can be facilitated on a basis of water saving and emission reduction.

Description

[0001] Technical field [0002] The invention relates to a bactericide and its application, and more particularly to a bactericide and its application in oil recovery water injection. [0003] Background technique [0004] At present, most of my country's oil fields have adopted the method of water injection development, so the relationship between water and oil production is extremely great. With the progress of oilfield water injection, two problems have arisen: one is the source of water injection. People hope to provide a large and stable source of water; the second is that the water content of crude oil continues to rise, and the amount of oily sewage is increasing. Discharge and disposal are a big problem. Therefore, the reinjection of oilfield wastewater is a correct way to rationally develop and utilize water resources. [0005] However, the water quality of oilfield wastewater is complex and contains many harmful components. Therefore, there are certain requirements for t...

AI Technical Summary

Problems solved by technology

With the water injection in the oil field, two problems have been brought about: one is the water source for water injection, and people hope to provide a large and stable water source; Emissions and disposal are big issues

However, in most domestic onshore oilfields, the oil production and water injection system is mainly carried out under closed conditions, and the content of organic matter in the injection water is high, which usually requires a large amount of oxidant to achieve the purpose of sterilization, and after long-term field experimental research, or due to poor sterilization effect Or it will increase corrosion, so it cannot be promoted and used in the field

[0012] Commonly used monomer agents for fungicides also include: heterocyclic compounds (imidazole derivatives, thiazole, imidazoline and triazine derivatives, isothiazolinone, polyquaternary thiazine, polypyridine, polyquinoline, chlorhexidine too, alkyl biguanide salts, etc.), aldehyde compounds (formaldehyde, isobutyraldehyde, acrolein, cinnamaldehyde, benzaldehyde, glyoxal, glutaraldehyde, etc.) and cyanide-containing compounds, etc., but these substances often have adsorption Defects such as strong loss, high dosage concentration or poor solubility

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