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

A technology of interpenetrating network structure and viscoelastic particle is applied in the field of preparation of superabsorbent resin with interpenetrating network structure. Effects of migratory capacity, strong shear capacity, high acid and salt resistance

Inactive Publication Date: 2015-04-01
XI'AN PETROLEUM UNIVERSITY
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  • Abstract
  • Description
  • Claims
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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

Method used

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

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preparation example Construction

[0033] The preparation method of viscoelastic particles of the present invention comprises the following steps:

[0034] 1) Add 1% to 10% of polyalcohol by mass to 20mL of distilled water, cover with a watch glass, dissolve completely in a water bath at 60°C to 95°C, and then cool to below 50°C to obtain solution A;

[0035] 2) Neutralize 5% to 15% of unsaturated carboxylic acid with NaOH solution to pH 6-7 in an ice-water bath to obtain solution B;

[0036] 3) Stir 40% to 60% attapulgite with 20mL of distilled water to form a uniformly dispersed phase;

[0037] 4) After completely dissolving 15% to 35% unsaturated amide, 0.01% to 0.5% crosslinking agent 1, and 0.02% to 1% initiator, stir evenly with solution B that has been neutralized to a pH value of 6-7 Mix with the attapulgite in step 2) to obtain solution C;

[0038] 5) Mix liquids A and C evenly, add 0.01% to 0.5% of crosslinking agent 2, cover with a watch glass, and react in a water bath at 65°C to 90°C for 0.5 to 6...

Embodiment 1-5

[0042]

[0043]

[0044] The interpenetrating network structure novel slow-swelling salt-resistant high-viscosity elastic particle of the present invention has good slow expansion performance, high water absorption expansion ratio, good viscoelasticity and toughness, high strength, and is suitable for deep water injection profile control, and is low in cost, convenient to prepare, and suitable for The environment is pollution-free.

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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...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09K8/512C08F220/56C08F220/06C08F220/54C08F212/14
CPCC08F220/56C08F265/02C08F265/10C09K8/512C08F220/54C08F212/14C08F220/06C08F220/281
Inventor 王潜龙
Owner XI'AN PETROLEUM UNIVERSITY
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