Coated proppant and preparation method thereof

Abstract

The invention discloses coated proppant which contains quartz sand and a resin layer, wherein the quartz sand is coated with the resin layer; the resin layer comprises a pre-cured resin layer and a curable resin layer from the inside out; the curable resin layer contains thermoplastic phenolic resin with the softening point of 85-110 DEG C and a phenolic resin curing agent; relative to 100 parts by weight of thermoplastic phenolic resin, the content of the phenolic resin curing agent is 10-30 parts by weight; the pre-cured resin layer is formed by curing bisphenol A epoxy resin with the epoxy value of 0.04-0.32 mol / 100 g, novolac epoxy resin with the epoxy value of 0.45-0.65 mol / 100 g and an epoxy resin curing agent. Through the technical scheme, the coated proppant provided by the invention can resist high temperature and can effectively prevent the phenomena of formation sand production and proppant return.

Description

technical field [0001] The invention relates to the field of fracturing production of heavy oil wells, in particular to a film-coated proppant and a preparation method thereof. Background technique [0002] Petroleum fracturing proppant is mainly used in oil and natural gas deep well mining, especially the material that must be used in oil and gas mining with a well depth of more than 2000 meters. Closed fracturing treatment to support fractures from closing due to stress release, allowing oil and gas to flow out from fracture channels, thereby maintaining high oil and gas conductivity, increasing oil and gas production, and extending oil and gas well services to increase the economic benefits of oil and gas production. [0003] At present, the proppants used in fracturing processes at home and abroad are mainly quartz sand, ceramsite and pre-cured film-coated proppants, while domestic fracturing processes are still dominated by quartz sand and ceramsite. Among them, quartz...

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Problems solved by technology

[0003] At present, the proppants used in fracturing processes at home and abroad are mainly quartz sand, ceramsite and pre-cured film-coated proppants, while domestic fracturing processes are still dominated by quartz sand and ceramsite. Among them, quartz sand is cheap and resource-intensive. It is abundant, but its compressive strength is low; although ceramsite solves the problem of low strength of quartz sand, it has problems such as high density and high construction risk; pre-cured film-coated proppant combines the advantages of quartz sand and ceramsite, and has strong However, in terms of high temperature resistance, formation sand prevention and proppant regurgitation, pre-cured film-coated proppants still cannot meet the needs of current oil and gas field exploration and development.

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