A novel liquid-solid phase change autogenous proppant fracturing fluid system and preparation method thereof

Abstract

This invention discloses a novel liquid-solid phase change self-generated proppant fracturing fluid system and its preparation method, comprising self-generated proppant fracturing fluid and non-reactive liquid; the self-generated proppant fracturing fluid comprises the following mass fractions: 5-16 parts building blocks, 0-5 parts functional unit A, 0-5 parts functional unit B, 0-2 parts initiator, and 72-93 parts solvent A; the non-reactive liquid comprises the following mass fractions: 0.1-1.6 parts functional unit C, 0-1.5 parts surfactant, 0.01-0.5 parts dispersant, 0-0.5 parts inorganic salt, and 96-99 parts solvent B. The fracturing fluid system of this invention abandons the traditional "proppant carrying" method, combining fracturing fluid and proppant into one, so that only liquid is injected into the formation in the entire fracturing system. When the liquid opens the formation to form artificial fractures, after the formation temperature recovers to 40-160°C, the liquid will undergo a chemical reaction under the action of the formation temperature to solidify, and form a solid within a short time of 5-20 minutes, which remains in the reservoir to support and induce artificial fractures. The fracturing fluid does not need to be returned to the surface, reducing reservoir damage.

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