Preparation method and application of a polymer demulsifier

CN122255448APending Publication Date: 2026-06-23HEBEI DACANG PETROCHEMICAL TECH CO LTD
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
HEBEI DACANG PETROCHEMICAL TECH CO LTD
Filing Date
2026-05-12
Publication Date
2026-06-23

AI Technical Summary

Technical Problem

Existing demulsifiers have low demulsification efficiency and poor injectability at the oil-water interface. High molecular weight polymers are difficult to inject, while low molecular weight polymers have limited penetration ability. Existing two-component reaction systems are prone to clogging in the wellbore.

Method used

A branched self-healing polyether composition is used, which is mixed in a wellhead static mixer via a Diels-Alder reaction to form a low-viscosity prepolymer. After entering the formation, it is polymerized in situ to form a highly active demulsifier, and thermally reversible covalent bonds are used to ensure safety.

Benefits of technology

It achieves efficient demulsification and dehydration, reduces injection pressure, improves demulsification activity, and has a self-healing function to avoid the risk of wellbore blockage.

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Abstract

This invention discloses a method for preparing and applying a polymer-type demulsifier, belonging to the field of petroleum extraction and crude oil dehydration technology. The preparation of the branched self-healing polyether polymer includes: using a polyhydroxy compound as a starting agent, sequentially performing ring-opening polymerization with propylene oxide and ethylene oxide to prepare a star-shaped amphiphilic polyether prepolymer; preparing a dihydroxy chain extender containing Diels-Alder bonds; and performing branching, chain extension, and self-assembly crosslinking of the prepolymer and the dihydroxy chain extender containing DA bonds under the action of a coupling agent to obtain the branched self-healing polyether polymer. The polymer is then mixed with a solvent to prepare a polymer-type demulsifier. This invention introduces the DA self-healing mechanism into the polyether demulsifier system for the first time. The resulting demulsifier possesses both a highly branched structure and thermally reversible self-healing function, and can restore its molecular structure after shear damage. It exhibits excellent and long-lasting demulsification and dehydration effects on crude oil emulsions, and is particularly suitable for high-shear gathering and transportation environments and difficult-to-demulsify systems.
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