Anti-swelling and sand-inhibiting agent for high-permeability heavy oil reservoir and preparation method of anti-swelling and sand-inhibiting agent

Abstract

The invention discloses an anti-swelling and sand-inhibiting agent for a high-permeability heavy oil reservoir. The anti-swelling and sand-inhibiting agent is prepared from components as follows: 10%-35% of acrylamide or methacrylamide, 5%-25% of 2-acrylamide-2-methylpropanesulfonate, 1%-5% of styrene or acrylonitrile, 5%-20% of acryloyloxyethyl trimethyl ammonium chloride or trimethylallylammonium chloride and water. The invention further provides a preparation method of the anti-swelling and sand-inhibiting agent for the high-permeability heavy oil reservoir. According to the preparation method, proportionally prepared monomers are simultaneously added to a reactor and sequentially subjected to catalysis, microwave heating and ultraviolet lamp irradiation, so that the functional monomers of the anti-swelling and sand-inhibiting agent for the high-permeability heavy oil reservoir are enabled to have homopolymerization; the anti-swelling and sand-inhibiting agent for the high-permeability heavy oil reservoir is suitable for medium-high-permeability heavy oil reservoirs at the temperature of 70-120 DEG C, clay swelling preventing and sand migration inhibiting effects are good, reservoir clay swelling and formation sand dispersion and migration can be inhibited, and fine sand and silty-fine sand in the formation can be effectively prevented from flowing into a wellbore.

Description

technical field [0001] The invention belongs to the technical field of petroleum drilling products, in particular to an anti-swelling and sand-inhibiting agent for high-permeability heavy oil reservoirs and a preparation method thereof. Background technique [0002] With the gradual development of unconsolidated sandstone reservoirs, the migration degree of fine sand and silty sand in the formation gradually increases, and a large amount of formation sand flows into the wellbore, thereby blocking the throat holes, reducing the permeability of the reservoir, and even sand burying the wellbore, resulting in oil well shutdown. At the same time, many reservoirs have high content of clay minerals. Improper measures during the development process will lead to expansion, dispersion and migration of clay minerals, resulting in damage to the reservoir and a decrease in permeability. These problems are especially obvious in some medium and high permeability heavy oil reservoirs. [0...

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Problems solved by technology

[0002] With the gradual development of unconsolidated sandstone reservoirs, the migration degree of fine sand and silty sand in the formation gradually increases, and a large amount of formation sand flows into the wellbore, thereby blocking the throat holes, reducing the permeability of the reservoir, and even sand burying the wellbore, resulting in oil well shutdown. At the same time, many reservoirs have high content of clay minerals, and improper measures during the development process will lead to expansion, dispersion and migration of clay minerals, causing damage to the reservoir and resulting in a decrease in permeability

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