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Slow expansion type pre-crosslinked gel particle and preparation method thereof

A technology of gel particles and pre-crosslinking, which is applied in the direction of chemical instruments and methods, drilling compositions, etc., can solve the problem of enhanced expansion performance of pre-crosslinked gel particles, increased toxicity of pre-crosslinked gel particles, It is beneficial to protect the environment and other issues, and achieve the effect of reducing the entry speed, realizing the polymerization of aqueous solution, and improving the crosslinking strength

Pending Publication Date: 2022-05-13
SICHUAN UNIVERSITY OF SCIENCE AND ENGINEERING
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Adding formaldehyde cross-linking agent to the system increases the toxicity of pre-cross-linked gel particles, which is not conducive to environmental protection, and the effect of slowing swelling is limited
Introducing monomers with hydrophobic groups into the system can prolong the swelling time to a certain extent, but as the content of hydrophobic groups increases, the swelling properties of the prepared pre-crosslinked gel particles in oil will be enhanced. The expansion performance in water is weakened, resulting in the phenomenon of oil blocking but not water blocking.
In addition, the main limitation of the existing technology is that the main raw material used to prepare pre-crosslinked gel particles is acrylamide, and the amide group in acrylamide has two hydrogen atoms, which can form strong hydrogen bonds with water molecules , water molecules are very easy to enter the pre-crosslinked gel particle molecules, making it rapidly expand

Method used

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  • Slow expansion type pre-crosslinked gel particle and preparation method thereof
  • Slow expansion type pre-crosslinked gel particle and preparation method thereof
  • Slow expansion type pre-crosslinked gel particle and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0030] A slow-swelling pre-crosslinked gel particle is prepared from the following ingredients in parts by weight:

[0031] Acrylic acid 30g, sodium lauryl sulfate 0.15g, N,N'-methylenebisacrylamide 0.07g, 1,5-pentanediol diacrylate 0.12g, initiator 0.13g, pH adjuster, pH adjuster The dosage of the agent should meet the pH value requirement of the adjusted solution, and the balance of deionized water, the weight part of the pH regulator in this scheme is 16.65g.

[0032] The initiator is a redox system composed of an oxidizing agent and a reducing agent, preferably a sodium bisulfate-ammonium persulfate system; the pH regulator is sodium hydroxide.

[0033] A preparation method of slow-swelling type pre-crosslinked gel particles, comprising the following steps:

[0034] First, add 50g deionized water and 30g acrylic acid in the round bottom flask, adjust the pH with 16.65g sodium hydroxide, obtain the solution after adjusting the pH value;

[0035] Then, add 0.15g of sodium ...

Embodiment 2

[0039] A preparation method of slow-swelling type pre-crosslinked gel particles, comprising the following steps:

[0040] First, take the raw materials according to the following weight group distribution ratio:

[0041] Acrylic acid 25g, sodium lauryl sulfate 0.15g, N,N'-methylenebisacrylamide 0.09g, 1,5-pentanediol diacrylate 0.15g, initiator 0.16g, pH regulator 13.88g, Deionized water surplus; Wherein, initiator is sodium bisulfate-ammonium persulfate, and pH regulator is sodium hydroxide;

[0042] Then, add 50g deionized water and 25g acrylic acid in the round bottom flask, adjust pH with 13.88g sodium hydroxide, obtain the solution after adjusting the pH value;

[0043] Then, add 0.15g sodium lauryl sulfate, 0.09g N,N'-methylene bisacrylamide, 0.15g 1,5-pentanediol diacrylate to the solution obtained after adjusting the pH value, and stir thoroughly Supplementary adding deionized water is made into the aqueous solution that the mass concentration of acrylic acid is 25%; ...

Embodiment 3

[0047] 28g of acrylic acid, 0.14g of sodium lauryl sulfate, 0.08g of N,N'-methylenebisacrylamide, 0.13g of 1,5-pentanediol diacrylate, 0.12g of initiator, 15.55g of pH regulator, Deionized water balance.

[0048] In this scheme, the initiator is a redox system composed of an oxidizing agent and a reducing agent, preferably a sodium bisulfate-ammonium persulfate system; the pH regulator is sodium hydroxide.

[0049] A preparation method of slow-swelling type pre-crosslinked gel particles, comprising the following steps:

[0050] First, add 50g deionized water and 28g acrylic acid in the round bottom flask, adjust the pH with 15.55g sodium hydroxide, obtain the solution after adjusting the pH value;

[0051] Then, add 0.14g of sodium lauryl sulfate, 0.08g of N,N'-methylenebisacrylamide, 0.13g of 1,5-pentanediol diacrylate to the solution obtained after adjusting the pH value, and add Add deionized water to make an aqueous solution with a mass concentration of acrylic acid of 2...

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Abstract

The invention relates to the technical field of improvement of crude oil recovery efficiency in oil fields, and discloses slow-expansion type pre-crosslinked gel particles and a preparation method thereof. The pre-crosslinked gel particles are prepared from the following raw materials: acrylic acid, lauryl sodium sulfate, N, N '-methylene bisacrylamide, 1, 5-pentanediol diacrylate, an initiator, a pH regulator and deionized water. The initiator is a redox system composed of an oxidizing agent and a reducing agent. The preparation method has the beneficial effects that the slow expansion performance of the pre-crosslinked gel particles can be enhanced, and the plugging strength of the pre-crosslinked gel particles is improved.

Description

technical field [0001] The invention relates to the technical field of enhanced oil recovery in oil fields, in particular to a slow-swelling pre-crosslinked gel particle and a preparation method thereof. Background technique [0002] my country's oil reservoirs are mainly developed by natural water flooding or artificial water injection. Affected by factors such as reservoir cementation degree, heterogeneity, and water injection system, the reservoir gradually fades after being washed by edge water, bottom water or injected water for a long time. The dominant seepage channel is formed, and edge water, bottom water or injected water will channel to the oil well along the dominant seepage channel, resulting in a decrease in oil production and an increase in water production in the oil well, seriously affecting the reservoir development effect. [0003] At present, in order to improve the development effect of natural water flooding or artificial water flooding and expand the sw...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08F220/06C08F222/38C08F222/14C08F2/10C09K8/512C09K8/516
CPCC08F220/06C08F2/10C09K8/512C09K8/516C08F222/385C08F222/102
Inventor 覃孝平李翠霞杨悦
Owner SICHUAN UNIVERSITY OF SCIENCE AND ENGINEERING
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