An anti-emulsifying demulsifier for treating oilfield produced fluid and a preparation method thereof

A novel cationic demulsifier synthesized via Eschweiler–Clarke reaction and quaternization effectively addresses the challenges of high-water-content oil-water emulsions, achieving superior demulsification and oil separation efficiency.

CN116535634BActive Publication Date: 2025-07-15DONGYING SPRING PETROLEUM ENG TECH
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Patent Information

Application Number
CN202310374258.7
Authority / Receiving Office
CN · China
Patent Type
Patents(China)
Current Assignee / Owner
Filing Date
2023-04-10
Publication Date
2025-07-15
Estimated Expiration
2043-04-10

AI Technical Summary

Technical Problem

Existing deemulsifiers are difficult to effectively treat oilfield production liquids with high water content and complex water quality, making it difficult to separate oil and water, and increasing the cost and difficulty of sewage treatment systems.

Method used

An anti-emulsion deemulsifier is used to synthesize quaternary ammonium salt surfactants by reacting aminopyridine with formaldehyde, chloroethanol, propylene oxide, etc., which has strong positive characteristics and can neutralize anionic surfactants, reduce oil-water interface tension, destroy the emulsified film, and achieve oil-water separation.

Benefits of technology

The anti-emulsion demulsifier exhibits excellent anti-emulsion and oil removal effects at low concentrations, with the anti-emulsion and oil removal rates reaching 97% and above 96%, respectively, which is significantly better than the prior art and reduces the difficulty of oil-water separation and treatment cost.

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Abstract

The present invention belongs to the technical field of oilfield chemistry, and particularly relates to an emulsion-proof demulsifier for treating oilfield produced liquid and a preparation method thereof. The preparation method is as follows: Add p-aminopyridine, 37 wt% formaldehyde, formic acid, and distilled water into a reactor, heat and reflux for reaction, cool, and perform vacuum distillation to obtain a viscous liquid; Dissolve the above viscous liquid with isobutanol, add chloroethanol, heat and reflux for reaction, perform vacuum distillation to obtain a viscous reddish-brown solid, and recrystallize to obtain a white-like solid; Dissolve the above white solid with toluene, transfer it to a high-pressure reactor, add a catalyst, introduce propylene oxide, raise the temperature, keep the temperature, lower the temperature, adjust the pH, and perform vacuum distillation to obtain the product emulsion-proof demulsifier. The emulsion-proof demulsifier of the invention has the characteristics of simple synthesis process and good emulsion-proof and demulsification effects.
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