Film covering proppant

Abstract

The invention belongs to the field of mixtures for hole drilling or well drilling and particularly discloses a film covering proppant. The film covering proppant comprises an aggregate and a resin layer for wrapping the aggregate; the resin layer is divided into an inner resin layer and an outer resin layer; the inner resin layer is synthesized from an inner layer synthetic material; the inner layer synthetic material comprises epoxy resin and an epoxy resin curing agent; the outer resin layer is synthesized from an outer layer synthetic material; the outer layer synthetic material comprises polyol resin, isocyanate resin, an amine additive and a catalyst, wherein the hydroxyl equivalent of the polyol resin is 60-300, and the mass fraction of the isocyanate resin is 2/5-4/5 of the polyol resin. The proppant can naturally suspend in clear water; while the fracturing index of a traditional proppant is satisfied, any thickening agent is not required to be added during the fracturing process, so that the fracturing cost is reduced, the fracturing process is simplified, and the environmental pollution is reduced.

Description

technical field [0001] The invention relates to the field of mixtures used for drilling or well drilling, in particular to a membrane-covered proppant. Background technique [0002] In order to develop deep oil and gas wells and increase production, hydraulic fracturing technology is widely used. Hydraulic fracturing technology is a technology that uses high-pressure pumps on the ground to continuously inject high-viscosity fracturing fluid into the oil well through the wellbore to form a high pressure in the lower part of the oil well. With the continuous injection of fracturing fluid, the pressure also continues to rise. When the tensile strength and formation stress of the formation rock near the wellbore wall are less than the pressure formed by the fracturing fluid, fractures will occur in the formation near the bottom of the well. When the fracturing fluid carrying proppant continues to be injected, the fractures in the rock formation will extend forward and be filled...

AI Technical Summary

Problems solved by technology

[0005] The effect of the polyurethane resin used in the proppant coating is to increase the hardness of the proppant and reduce the fracture rate of the proppant, but this kind of proppant only meets the requirements of strength and ha

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