A temperature-resistant and salt-resistant polymer microsphere, its preparation method and application

By modifying dendritic mesoporous silica-loaded copper oxide quantum dots, hollow structure polyacrylamide microspheres were prepared by reverse phase emulsion polymerization process, which solved the problem of poor temperature and salt resistance in oil field applications, achieved the stability and controllable expansion of microspheres, and met the efficient demand for oil field oil production.

CN119219870BActive Publication Date: 2025-03-21SUZHOU CHUXIN MOYI TECH CO LTD
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Patent Information

Application Number
CN202411755643.7
Authority / Receiving Office
CN · China
Patent Type
Patents(China)
Current Assignee / Owner
Filing Date
2024-12-03
Publication Date
2025-03-21
Estimated Expiration
2044-12-03

AI Technical Summary

Technical Problem

In oil field applications, existing polymer microspheres have problems such as poor temperature and salt resistance, easy shear crushing and low sealing strength, which are difficult to meet the requirements of water blocking, deep dissection adjustment and displacement in oil field oil production.

Method used

Polyacrylamide microspheres with hollow structures were prepared by using modified dendritic mesoporous silica as a carrier and loading copper oxide quantum dots. The process involves modifying dendritic mesoporous silica with a mercaptosilane coupling agent, ultrasonic dispersing of copper oxide quantum dots, and subsequent polymerization under stirring conditions to form microspheres.

Benefits of technology

The prepared temperature-resistant and salt-resistant polymer microspheres have good stability and can be controlled to expand in brine, which improves the elastic deformation ability of the microspheres and the water absorption and rupture resistance of high-temperature and high-salt environments, and meets the requirements of improving crude oil recovery such as water blocking, deep dissection adjustment and displacement in oil field oil production.

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Abstract

The present invention belongs to the field of petrochemical industry, and particularly relates to a heat-resistant and salt-resistant polymer microsphere, and a preparation method and application thereof. The present invention uses modified dendritic mesoporous silica loaded with copper oxide quantum dots as the core, and prepares heat-resistant and salt-resistant polymer microspheres with a quasi-hollow structure through an inverse emulsion polymerization process. The polyacrylamide microspheres prepared by the present invention have good dispersibility and water swelling properties, and can be directly prepared from the sewage of the oil field to obtain a working fluid for injection for profile adjustment, and can be used in the middle and late stages of oil field development. The quasi-hollow structure not only improves the elastic deformation ability of the microspheres, but also the internal loose structure can effectively absorb and disperse the expansion tension on the surface, prevent the microspheres from breaking, and improve their stability under high temperature and high salt conditions, which can meet the field operation requirements of increasing crude oil recovery such as water plugging, deep profile adjustment and displacement in oil field production.
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