Retarding-swelling salt-tolerant high-viscoelasticity particles with interpenetrating network structure and preparation method thereof

Abstract

The invention discloses retarding-swelling salt-tolerant high-viscoelasticity particles with an interpenetrating network structure and a preparation method thereof. The method comprises the following steps: preparing liquid A: dissolving polymeric alcohol at certain temperature and cooling; preparing liquid B: neutralizing unsaturated carboxylic acid to a certain pH value; preparing liquid C: uniformly mixing a crosslinking agent 1, unsaturated amide, an initiator and attapulgite with the liquid B; uniformly mixing the liquid A with the liquid C, adding a crosslinking agent 2, and preserving heat at certain temperature; and finally, drying and granulating the polymer. The novel retarding-swelling salt-tolerant high-viscoelasticity particles with the interpenetrating network structure, disclosed by the invention, have the advantages of good retarding-swelling property, high water swelling rate, good viscoelasticity and toughness and high strength, and can adapt to deep water injection profile control; and moreover, the cost is low, the preparation is convenient, and the environmental pollution is avoided.

Description

technical field [0001] The invention belongs to the field of preparation of interpenetrating network structure superabsorbent resin, in particular to a kind of interpenetrating network structure slow-swelling anti-salt viscoelastic particles and its preparation method, which can be used for oil reservoirs buried deep in the profile control process of oilfield water injection wells , high salinity and other issues have a more significant effect. Background technique [0002] In "low abundance, low pressure, low permeability" reservoirs, advanced water injection and perforation fracturing techniques are required to exploit such "three low" reservoirs. The difference in ground stress will lead to the development of natural fractures, and hydraulic fracturing will produce many artificial fractures. The intersection of natural fractures and multiple artificial fractures will eventually lead to serious "coning" of injected water and "flooding" of bottom water in the middle and lat...

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Problems solved by technology

[0007] In order to solve the heterogeneity of the oil layer and the viscosity difference between oil and water in the process of crude oil production, the water injected into the oil layer will advance unevenly along the oil layer with high permeability and large pores, resulting in the degree of water injection in the middle and low permeability layers and the degree of water flooding. The problem of inefficiency

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