A two-repellent nano oil displacement agent for low-permeability oil reservoirs, a preparation method and application thereof

By grafting quaternary ammonium groups and fluorocarbon chains onto the surface of nano-silica, an amphiphilic nano-displacement agent was prepared, which solved the problem of easy clogging of conventional nano-displacement agents in low-permeability reservoirs, and achieved a reduction in water injection pressure and an increase in oil recovery rate.

CN121930808BActive Publication Date: 2026-07-03新疆晟远德能源工程有限责任公司 +1
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Patents(China)
Current Assignee / Owner
新疆晟远德能源工程有限责任公司
Filing Date
2026-03-25
Publication Date
2026-07-03

AI Technical Summary

Technical Problem

Conventional nano-displacement agents tend to agglomerate and clog in low-permeability reservoirs, resulting in high water injection pressure and low oil recovery rate. Existing modifiers have poor dispersibility in low-permeability reservoirs and are difficult to adapt to formation conditions.

Method used

Amphoteric nano-oil displacement agent was prepared by grafting silane coupling agents containing quaternary ammonium groups and silane coupling agents containing fluorocarbon chains onto surface-modified nano-silica. This agent improves the wettability of rock surfaces, inhibits clay swelling, reduces water injection pressure, and expands the swept volume.

Benefits of technology

It effectively reduces water injection pressure, increases crude oil recovery, improves reservoir protection, simplifies operation procedures, reduces costs, and is suitable for field promotion in oil fields.

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Abstract

This invention discloses an amphiphilic nano-displacement agent for low-permeability oil reservoirs, its preparation method, and its application, belonging to the field of nanomaterial-based oil displacement technology. The agent is surface-modified nano-silica grafted with silane coupling agents containing quaternary ammonium groups and fluorocarbon chains. The nano-silica particles have a diameter of 5-10 nm and a purity ≥99 wt%. Preparation employs a one-pot, multi-step method, where the nano-silica is dispersed and then reacted sequentially with two hydrolyzed silane coupling agents. The product is obtained after centrifugation, drying, and grinding. This agent, formulated into a 20-500 mg / L dispersion, improves rock wettability and inhibits clay swelling, achieving pressure reduction and enhanced injection in low-permeability oil reservoirs, increasing oil recovery, and solving the problems of high water injection pressure and low recovery rate in low-permeability oil reservoirs. Furthermore, the preparation process is simple and low-cost, making it suitable for field application in oilfields.
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