Water-based epoxy / amine composite high-temperature chemical sand consolidant for offshore oil fields and preparation method and application thereof

By combining ultra-low viscosity self-emulsifying hydrophilic epoxy resin with compound amine curing agent, the problems of poor permeability and curing rate of sand-fixing agents at high temperatures in offshore oilfields are solved, providing a high-efficiency sand control solution suitable for high-temperature formations in offshore oilfields, achieving high-strength consolidation and environmentally friendly low viscosity chemical sand-fixing effect.

CN122104191APending Publication Date: 2026-05-29CNOOC ENERGY TECHNOLOGY & SERVICES LTD
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
CNOOC ENERGY TECHNOLOGY & SERVICES LTD
Filing Date
2026-02-11
Publication Date
2026-05-29

AI Technical Summary

Technical Problem

Offshore oilfield reservoirs are loose and have high clay content, making them prone to sand and mud production. Conventional chemical sand control measures are difficult to solidify effectively at high temperatures, and existing water-based sand-fixing agents have poor permeability and solidification rate at high temperatures, which cannot meet the demanding working conditions of offshore oilfields.

Method used

A water-based epoxy/amine composite high-temperature chemical sand-fixing agent is formed by combining ultra-low viscosity self-emulsifying hydrophilic epoxy resin with compounded amine curing agents and modifying additives. The curing rate and permeability are controlled through a special grafting modification process to form a high-strength solidified body.

Benefits of technology

It achieves controllable curing at 45–100℃, with a compressive strength ≥10.5MPa, good salt resistance, and 40% improved permeability, solving the sand control problem in high-temperature formations in offshore oilfields and reducing the risks and costs of well workover operations.

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Abstract

The application discloses a water-based epoxy / amine composite medium-high temperature chemical sand consolidating agent for offshore oil fields and a preparation method and application thereof. First, an alicyclic modified epoxy resin is mixed with a hydrophilic dispersible small molecular weight type hydrogenated bisphenol A glycidyl ether to obtain an epoxy resin premix solution; then, a modified polyurethane polymer composite additive, dimer acid diglycidyl and part of water are mixed and ultrasonically dispersed to obtain a modified additive dispersion solution; and then, the modified additive dispersion solution, a surfactant modified phosphate ester polymer dispersant and a compounded amine curing agent are added into the epoxy resin premix solution to obtain the water-based epoxy / amine composite medium-high temperature chemical sand consolidating agent. The water-based epoxy / amine composite medium-high temperature chemical sand consolidating agent is designed through medium-high temperature curing, is environmentally friendly, and is synergistically compounded with the amine, and still exhibits excellent permeability and consolidation strength in a high-temperature high-salt environment of 45 DEG C to 100 DEG C, is significantly better than traditional solvent type products, and meets the sand prevention requirements of medium and deep layers in offshore oil fields.
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