High-temperature-resistant hyperbranched viscosifying self-generating acid, preparation method and application thereof

By preparing high-temperature resistant hyperbranched thickening autogenous acid, the problem of incompatibility between thickener and acid generator at high temperatures was solved, achieving thickening effect of autogenous acid solution and deep reservoir acidification at high temperatures, which is suitable for acid fracturing of ultra-high temperature reservoirs.

CN122255487APending Publication Date: 2026-06-23CHINA NAT PETROLEUM CORP +1
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
CHINA NAT PETROLEUM CORP
Filing Date
2024-12-20
Publication Date
2026-06-23

AI Technical Summary

Technical Problem

Existing thickeners are incompatible with acid generators at high temperatures, resulting in rapid reaction rates, severe tubing corrosion, and an inability to effectively acidify deep reservoirs and etch fracture walls, thus limiting the development of high-temperature and ultra-high-temperature carbonate reservoirs.

Method used

The product is prepared by using high-temperature resistant hyperbranched thickening autogenous acid, which is produced by the iterative reaction of maleic anhydride with polyhydroxy alcohol or polyhydroxy alcohol amine. The autogenous acid hydrolyzes in water to produce H+, exhibiting excellent sustained-release performance and high-temperature resistance. No additional thickener is required, and the molecule has a hyperbranched structure.

Benefits of technology

It achieves the thickening effect of self-generated acid at high temperatures, reduces production costs, increases the acid action distance, and improves the acidification depth, making it suitable for acid fracturing of ultra-high temperature reservoirs.

✦ Generated by Eureka AI based on patent content.

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Abstract

The present application relates to oil and gas field chemical auxiliary technical field, disclose a kind of high-temperature resistant hyperbranched viscosifying self-generating acid, preparation method and application thereof, the viscosifying self-generating acid of the present application is prepared by iteration reaction with maleic anhydride and polyhydroxy alcohol and / or polyhydroxy alcohol amine as raw material, and the viscosifying self-generating acid obtained by preparation is hyperbranched molecule, and its molecule has hyperbranched structure inside.The hyperbranched viscosifying self-generating acid of the present application is hyperbranched structure, without additional thickening agent when using, itself has thickening function, with excellent viscosifying performance, and preparation process is simple, yield is high and cost is low.And, as acidizing fluid still has good self-generating acid ability under superhigh temperature, especially suitable for acid fracturing reconstruction of superhigh temperature reservoir.
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