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Spherical gel particle as well as preparation method and application thereof

A gel particle and spherical technology, applied in chemical instruments and methods, drilling compositions, etc., can solve problems such as weak gelation ability and low underground compressive strength

Pending Publication Date: 2022-07-26
LANZHOU UNIVERSITY OF TECHNOLOGY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, traditional temporary plugging agents still have the problems of low underground compressive strength and weak gelling ability.

Method used

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  • Spherical gel particle as well as preparation method and application thereof
  • Spherical gel particle as well as preparation method and application thereof
  • Spherical gel particle as well as preparation method and application thereof

Examples

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preparation example Construction

[0032] The invention provides a preparation method of spherical gel particles, comprising the following steps:

[0033] (1) mixing acrylic acid, water and alkali, and carrying out neutralization reaction to obtain a mixed solution; the degree of neutralization of acrylic acid in the mixed solution is 55-85%;

[0034] (2) mixing the mixed solution obtained in the step (1) with methacrylic acid-β-hydroxyethyl ester, acrylamide, potassium persulfate and aluminum nitrate to obtain a precursor solution;

[0035] (3) adding the precursor obtained in the step (2) dropwise to the silicone oil to carry out free radical polymerization to obtain spherical gel particles;

[0036] The temperature of the silicone oil is 80-100°C.

[0037] In the present invention, unless otherwise specified, the raw materials used are conventional commercially available products in the field.

[0038] In the present invention, acrylic acid, water and alkali are mixed, and a neutralization reaction is carr...

Embodiment 1

[0063] A kind of preparation method of spherical gel particles

[0064] (1) under the condition of stirring, add 3.6g acrylic acid and 4g water to the beaker of 50mL, then slowly add 1.6g sodium hydroxide, carry out neutralization reaction, obtain the mixed solution that the neutralization degree of acrylic acid is 80%; The mass ratio of acrylic acid and water is 3.6:4;

[0065] (2) 0.517g of methacrylic acid-β-hydroxyethyl ester and 2.1g of acrylamide were successively added to the mixed solution obtained in the step (1), and then, under stirring conditions, 0.5% of permeate was added successively. The potassium sulfate aqueous solution (containing 0.057g potassium persulfate) and the aluminum nitrate aqueous solution (containing 0.057g aluminum nitrate) with a mass concentration of 0.5% are mixed to obtain a precursor solution;

[0066] The mass ratio of acrylic acid in the step (2) and acrylamide in the step (2) is 1.2:0.7;

[0067] In the step (2), the mass fraction of m...

Embodiment 2

[0071] Spherical gel particles were prepared according to the method of Example 1

[0072] The difference from Example 1 is that in the step (2), the mass of β-hydroxyethyl methacrylate is 1.035 g, and the mass fraction of β-hydroxyethyl methacrylate in the precursor solution is 10%. .

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Abstract

The invention provides spherical gel particles as well as a preparation method and application thereof, and belongs to the field of polymer microsphere materials. The spherical gel particles with high compressive strength and strong gelling ability are prepared by combining a dripping method and a free radical polymerization method, taking acrylamide and acrylic acid as functional monomers, taking methacrylic acid-beta-hydroxyethyl ester as an auxiliary agent, taking aluminum nitrate as a cross-linking agent and taking potassium persulfate as an initiator. Results of the embodiment show that the spherical gel particles prepared by the method are roughly the same in size, uniform in texture and relatively good in balling property, and the water absorption rate of the gel particles reaches the highest at the temperature of 40 DEG C and 50 DEG C; when the mass fraction of methacrylic acid-beta-hydroxyethyl ester in the current flooding liquid is 20% at the temperature of 30 DEG C, the compressive strength of the gel particles reaches up to 8.768 * 10 < 4 > Pa.

Description

technical field [0001] The invention relates to the field of polymer microsphere materials, in particular to a spherical gel particle and a preparation method and application thereof. Background technique [0002] Nowadays, energy determines the comprehensive strength of a country. With the rapid development of society, energy has become the target of competition among various countries, especially for non-renewable energy such as oil, the demand is far greater than the actual supply, so oil resources mining has always been a research hotspot. And for some oilfields that have already been developed, due to technical limitations, the technical procedures in the early stage of exploitation are not perfect, resulting in further excavation still difficult and the cost continues to increase. As oilfield development enters the later stage of excavation, oil and gas well water production is becoming more and more serious, which limits the improvement of crude oil recovery to a lar...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08F283/12C08F220/06C08F220/20C08F220/56C09K8/508C09K8/516
CPCC08F283/12C09K8/5083C09K8/516C08F220/06C08F220/20C08F220/56
Inventor 张定军张梅菊冷啸宋伟田晓蔚马应霞朱福良蒙延双何自荣
Owner LANZHOU UNIVERSITY OF TECHNOLOGY
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