Modifier for fracturing proppant and preparation process thereof as well as modification process of fracturing proppant

Abstract

The invention relates to a modifier for a fracturing proppant and a preparation process thereof as well as a modification process of the fracturing proppant, the modifier can effectively modify the fracturing proppant used for oil and gas exploitation, greatly improves the water resistance and oil permeability of the fracturing proppant. Graphite is used to prepare the modifier for the fracturingproppant to modify the fracturing proppant, a graphite oxide layer is attached to the surface of the fracturing proppant, and is reduced to a single layer graphene sheet by a reduction method, and byenhancement of the hydrophobicity of the fracturing proppant, the fracturing proppant with excellent water resistance and oil permeability is prepared.

Description

technical field [0001] The present invention relates to the field of proppants, in particular to a modifier for fracturing proppants which can effectively modify the fracturing proppant used in oil and gas exploitation, and greatly improve its water-blocking and oil-permeable ability and Its preparation process, and the modification process of fracturing proppant. Background technique [0002] Hydraulic fracturing technology and fracturing proppants have a broad market in oil and gas development, especially in the development of low-permeability and mid-to-late oil and gas fields. The performance index of proppant and its synthesis process directly affect the cost, effect and environment of hydraulic fracturing. Especially in the high water-cut period of oilfield development, the water content is as high as 95%, and it is easy to cause water flooding after fracturing, resulting in an increase in the water content rate. At present, ceramsite, quartz sand, resin-coated sand a...

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Problems solved by technology

[0003] On June 23, 2017, the Chinese Patent Office disclosed an invention patent application for a hydrophobic modified proppant and its preparation method, the application publication number is CN106883837A. The invention patent uses a small amount of hydrophobic resin glue added to the proppant, shaking or stirring Make the hydrophobic glue liquid wet the surface of the proppant, and then solidify to obtain a hydrophobic modified proppant, which has certain hydrophobic and water-blocking properties, but in its raw materials, the hydrophobic resin glue uses fluorinated acrylic resin glue and fluorinated dopamine Hydrophobic glue and other fluorine-containing compounds will have a great adverse impact on the environment, which does not meet environmental protection requirements, and the resin glue coating is prone to oxidation and aging, and the stability is insufficient, which cannot meet the needs of long-term use

[0004] The Chinese Patent Office also disclosed on June 5, 2013 the invention patent authorization for a functional resin-coated proppant and its preparation method. The organosilicon compounds with groups and hydrophobic groups react with the resin to connect the organosilicon compound molecules to the crosslink of the resin film. Since the organosilicon compound is a low surface energy substance, its hydrophobic groups are coated on the outside of the resin. The surface forms a hydrophobic structure, but the contact angle of the solid-liquid phase on the outer surface is greater than 120°, while the outer surface is smooth, and the maximum water contact angle is only 120°, while in deep well oil layers or high displacement pressure Its contact angle may be greater than 120° when used in an environment that limits its effectiveness in deep well reservoirs or high displacement pressure environments

[0005] On August 3, 2016, the Chinese Patent Office also disclosed the invention patent authorization of a hydrophobic proppant and its preparation method, the authorized announcement number is CN102443387B, which uses nano particles, and evenly distribute the nanoparticles in the coating resin, so that the contact angle with water is 120-180°, which improves the effect of its use in deep well oil layers or high displacement pressure environments, but its raw materials are still The presence of fluorine compounds will have a relatively large adverse impact on the environment and do not meet environmental protection requirements