Liquid-solid phase change self-supporting fracturing fluid as well as preparation method and application thereof

By using an oil-in-water emulsion of liquid-solid phase change self-supporting fracturing fluid and modifying hyperbranched bio-based epoxy resin to enhance the support of terminal microfractures, the problems of migration and insufficient support of conventional proppant in shale oil and gas reservoirs were solved, achieving efficient microfracture support and oil and gas extraction.

CN121592331AActive Publication Date: 2026-03-03CHINA UNIV OF GEOSCIENCES (BEIJING) +1
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Patent Information

Application Number
CN202610121482.9
Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
Filing Date
2026-01-29
Publication Date
2026-03-03
Estimated Expiration
2046-01-29

AI Technical Summary

Technical Problem

Existing technologies are insufficient to effectively support the terminal microfractures of shale oil and gas reservoirs. Conventional proppant faces high resistance to migration within complex fracture networks, and the microfracture network lacks sufficient conductivity after fracturing fluid flowback, thus affecting oil and gas development efficiency.

Method used

A liquid-solid phase change self-supporting fracturing fluid is used. It is formed by using a water-in-oil emulsion and modified hyperbranched bio-based epoxy resin as a toughening agent to form a low-viscosity, low-density, and high-strength three-dimensional network structure, which can easily migrate to the terminal microcracks and form support through phase transformation.

Benefits of technology

It achieves effective support for microfractures, enhances the fracture network function, improves oil and gas extraction efficiency, and the preparation method is environmentally friendly and pollution-free with a high yield.

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Abstract

The invention relates to the technical field of petroleum fracturing, in particular to liquid-solid phase change self-supporting fracturing fluid as well as a preparation method and application thereof. The liquid-solid phase change self-supporting fracturing fluid is an oil-in-water emulsion and comprises an oil phase and a water phase, the oil phase comprises the following components in parts by weight: 5-10 parts of modified hyperbranched bio-based epoxy resin, 20-55 parts of linear bio-based epoxy resin and 5-10 parts of a curing agent; the water phase comprises 45-50 parts of water, 1-6 parts of an emulsifier and 0.2-0.5 part of a thickening agent. The modified hyperbranched bio-based epoxy resin is introduced as a toughening agent, so that the obtained liquid-solid phase change self-supporting fracturing fluid has the application advantages of low viscosity, low density, high strength, high toughness, low friction resistance, easiness in migration to tail end microcracks to form effective support through phase change and the like, and has a relatively good application prospect.
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Citation Information

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  • Preparation method of self-phase-change proppant based on emulsified toughened bio-based epoxy resin

    CN114214057A

  • Bio-based hyperbranched polymer epoxy resin and preparation method thereof

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  • Methods of simultaneously introducing a curable resin and curing agent with delayed curing

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