Phase change fracturing fluid system for phase change fracturing

Abstract

The invention discloses a phase change fracturing fluid system for phase change fracturing. The phase change fracturing fluid system is prepared from, by weight, 10%-40% of supramolecular building structure, 0-40% of supramolecular function unit, 0.5%-2% of surfactant, 0-5% of inorganic salt, 0.5%-2% of oxidizing agent, 0-2% of cosolvent and the balance solvent, wherein the supramolecular building structure is melamine or triallyl isocyanurate or a mixture of melamine and triallyl isocyanurate, the supramolecular function unit is vinyl acetate or acrylonitrile or a mixture of vinyl acetate and acrylonitrile, and the solvent is methylbenzene or ethylbenzene or o-xylene or m-xylene or p-xylene. In the fracturing construction process, a conventional fracturing fluid is used for fracturing a stratum, the phase change fracturing fluid is injected into the stratum, or the phase change fracturing fluid and other fluids which cannot be subjected to phase change are injected into the stratum together, a supramolecular material in the phase change fracturing fluid is subjected to self-assembly to form a solid phase material with a certain strength, support to cracks is achieved, and construction operation is easy, convenient, safe and efficient.

Description

technical field [0001] The invention relates to reservoir hydraulic fracturing stimulation technology in the process of petroleum development, belongs to the research field of supramolecular chemistry and self-assembly nanotechnology, and specifically relates to a phase-change fracturing fluid system based on supramolecular self-assembly. Background technique [0002] Hydraulic fracturing technology has been widely used in the development of oil and gas fields as the main measure for oil and gas well stimulation and water well injection, and has made important contributions to the stable production and injection of oil and gas fields. Hydraulic fracturing is to pump high-viscosity pre-fluid into the target reservoir to form and extend fractures at high pressure, and then pump sand-carrying fluid mixed with proppant. The sand-carrying fluid can continue to extend the fracture and carry proppant deep into the fracture. For fractures, it is best to degrade the fracturing fluid ...

AI Technical Summary

Problems solved by technology

In 2010, Schlumberger proposed that the fracture conductivity of HIWAY high-speed channel flow is not affected by the permeability of proppant. Compared with conventional fracturing technology, this technology also needs to inject solid phase proppant into the formation, and the process implementation is complicated

Regardless of low-density or high-density proppant, it is necessary to inject solid-phase proppant from the wellhead into the formation, and the solid-phase proppant in the conventional sand fracturing construction process will have problems such as difficult injection and difficult injection.

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