High-temperature-resistant composite nanofluid scale inhibitor and preparation method thereof

By using high-temperature composite nanofluid scale inhibitors made of modified graphene oxide nano and calcium-based polysulfonic acid, the problem of calcium carbonate scale under high temperature, high salt and alkaline conditions in oil field development has been solved, and effective scale inhibition effect and improvement of flow capacity has been achieved.

CN119707133AActive Publication Date: 2025-03-28XINJIANG GUANGYA OIL & GAS NEW TECH DEV CO LTD
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Patent Information

Application Number
CN202510229278.4
Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
Filing Date
2025-02-28
Publication Date
2025-03-28
Estimated Expiration
2045-02-28

AI Technical Summary

Technical Problem

During the oil field development process, calcium carbonate scaling is prone to occur in reservoirs or wellbores under high temperature, high salt and alkaline conditions, resulting in a decrease in seepage capacity and flow capacity, affecting oil and gas production. The prior art is difficult to effectively suppress such scaling.

Method used

A high temperature resistant composite nanofluid scale inhibitor is used, which consists of modified graphene oxide nanoAP-GO, calcium-based nanomodifier calcium-based polysulfonic acid Ca-PAMPS, surfactant, inorganic salt and deionized water. Modified graphene oxide nanometers have large-scale conjugated rings and a large number of carboxylic acids and hydroxyl groups, and calcium-based polysulfonic acids have strong hydrophilicity, calcium ion tolerance and calcium ion chelating properties.

Benefits of technology

This scale inhibitor shows good scale inhibition effect under high temperature, high salt and alkaline conditions, effectively inhibits calcium carbonate scale, improves the flow capacity of oil field water injection and fracturing reflow, and has good promotion prospects.

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Abstract

The invention discloses a high-temperature-resistant composite nanofluid scale inhibitor and a preparation method thereof, and belongs to the technical field of oilfield chemistry. The composite nano fluid scale inhibitor is prepared from modified graphene oxide nano AP-GO, a calcium-based nano modifier calcium-based polysulfonic acid Ca-PAMPS, a surfactant, an inorganic salt and deionized water, the calcium-based nano modifier calcium-based polysulfonic acid contains a large amount of sulfonic acid, carboxylic acid and hydroxyl groups, has strong hydrophilicity, calcium ion tolerance and calcium ion chelating property, and has a good scale inhibition effect on calcium carbonate scale and barium sulfate scale; meanwhile, the modified graphene oxide nanoparticles have large-scale conjugated rings, a large amount of carboxylic acid and hydroxyl groups, and have synergistic interaction with calcium-based polysulfonic acid under the action of anion shielding and large steric hindrance effects, so that the high temperature resistance and scale inhibition performance of the nano scale inhibitor are further improved, a good scale inhibition effect is achieved, and the problems of oilfield water injection and fracturing flowback scaling are effectively solved; good popularization prospects are realized.
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