A fracturing reservoir protectant with anti-expansion and anti-collapse functions, its preparation method and application

By combining amphiphilic modified graphene oxide with surfactants, the problem of preventing swelling and collapse in high-clay, weakly cemented reservoirs was solved, the protective ability of reservoir protectants was enhanced, and the fracturing effect and recovery rate were improved.

CN121930810BActive Publication Date: 2026-06-30XINJIANG GUANGYA OIL & GAS NEW TECH DEV CO LTD
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Patent Information

Application Number
CN202610377578.1
Authority / Receiving Office
CN · China
Patent Type
Patents(China)
Current Assignee / Owner
Filing Date
2026-03-26
Publication Date
2026-06-30
Estimated Expiration
2046-03-26

AI Technical Summary

Technical Problem

Existing reservoir protectants for fracturing cannot simultaneously meet the dual requirements of preventing swelling and collapse in reservoirs with high clay content and weak cementation, resulting in severe reservoir damage during fracturing and affecting production capacity.

Method used

By employing a combination of amphiphilic modified graphene oxide, amine clay stabilizers, cationic surfactants, and nonionic surfactants, the bonding strength between rock skeleton particles is enhanced through a synergistic mechanism of chemical inhibition and physical blocking, forming a hydrophobic barrier to prevent water phase intrusion, thus preventing clay hydration swelling and rock skeleton collapse.

Benefits of technology

It effectively prevents clay hydration and expansion and rock skeleton collapse, enhances reservoir compressive strength, reduces reservoir damage, improves fracturing effect, and is suitable for the entire fracturing construction cycle. The product is green, efficient and easy to use.

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Abstract

This invention discloses a fracturing reservoir protectant with anti-swelling and anti-collapse functions, its preparation method, and its application, belonging to the field of fracturing technology. The fracturing reservoir protectant comprises: amphiphilic modified graphene oxide, an amine-based clay stabilizer, a cationic surfactant, a nonionic surfactant, and deionized water. The fracturing reservoir protectant of this invention achieves synergistic anti-swelling and anti-collapse effects. Through the combination of the amine-based clay stabilizer and the cationic surfactant, it exerts a highly efficient clay hydration inhibition effect, with an anti-swelling rate greater than 95% and excellent water wash resistance, effectively inhibiting the hydration and swelling of clay minerals for a long time. The core component, amphiphilic modified graphene oxide, can physically adsorb onto the surface of rock fractures and nanopores, forming a dense hydrophobic barrier that effectively prevents water phase intrusion. Simultaneously, it synergistically alters rock wettability with the surfactant. This invention fundamentally solves the problem of skeletal instability and collapse in weakly cemented reservoirs caused by hydration swelling and capillary percolation.
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