Mussel bionic gel composition, self-repairing gel, profile control and water plugging agent, method for preparing self-repairing gel, and use

Patent metadata

Field	Value
Publication number	US-11427748-B2
Application number	US-202117528370-A
Country	US
Kind code	B2
Filing date	Nov 17, 2021
Priority date	Nov 17, 2020
Publication date	Aug 30, 2022
Grant date	Aug 30, 2022

Abstract

A mussel bionic gel composition includes: a mussel bionic copolymer and/or a mussel bionic compound, a cross-linking agent and water, wherein the mussel bionic copolymer includes a structural unit A from a vinyl monomer and a structural unit B from a vinyl-containing mussel bionic catechol group monomer; and the mussel bionic compound includes polyacrylamide and a mussel bionic catechol compound. The self-growth gel particle profile control and water plugging agent prepared from the composition is low in initial apparent viscosity, easy to inject and far in migration, has good shear repairing performance and is particularly applicable to a low-permeability fractured reservoir, thereby adjusting a micro-fracture network, improving a fracture channel and increasing waterflood efficiency and recovery efficiency.

First claim

The invention claimed is:

1. A self-repairing gel, wherein the gel is formed, through aging and gelatinizing, by a composition comprising a mussel bionic copolymer and/or a mussel bionic compound, a cross-linking agent and water,
wherein the mussel bionic copolymer comprises a structural unit A from a vinyl monomer and a structural unit B from a vinyl-containing mussel bionic catechol group monomer; and

the mussel bionic compound comprises polyacrylamide and a mussel bionic catechol compound.

2. The self-repairing gel according to claim 1 , wherein the mussel bionic copolymer has a degree of hydrolysis of 5 mol % to 28 mol %; a weight-average molecular weight of 7 million g/mol to 10 million g/mol; and a complete dissolution time shorter than 1.5 h.

3. The self-repairing gel according to claim 2 , wherein the mussel bionic copolymer has a degree of hydrolysis of 10 mol % to 18 mol %; and a weight-average molecular weight of 8 million g/mol to 9 million g/mol.

4. The self-repairing gel according to claim 1 , wherein polyacrylamide has a degree of hydrolysis of 5 mol % to 28 mol %; a weight-average molecular weight of 7 million g/mol to 15 million g/mol; and a complete dissolution time shorter than 1.5 h.

5. The self-repairing gel according to claim 4 , wherein polyacrylamide has a degree of hydrolysis of 5 mol % to 17 mol %; and a weight-average molecular weight of 8 million g/mol to 12 million g/mol.

6. The self-repairing gel according to claim 1 , wherein a consumption amount of the mussel bionic copolymer is 0.2 part by weight to 0.6 part by weight; a consumption amount of the mussel bionic compound is 0.2 part by weight to 0.6 part by weight; a consumption amount of the cross-linking agent is 0.6 part by weight to 1.5 parts by weight; and a consumption amount of the water is 97.9 parts by weight to 99.2 parts by weight.

7. The self-repairing gel according to claim 6 , wherein a consumption amount of the mussel bionic copolymer is 0.25 part by weight to 0.4 part by weight; a consumption amount of the mussel bionic compound is 0.25 part by weight to 0.4 part by weight; a consumption amount of the cross-linking agent is 0.8 part by weight to 1.2 parts by weight; and a consumption amount of the water is 98.4 parts by weight to 98.95 parts by weight.

8. The self-repairing gel according to claim 1 , wherein based on a total weight of the mussel bionic copolymer, a content of the structural unit A is 75 wt % to 90 wt %, and a content of the structural unit B is 10 wt % to 25 wt %; and
based on a total weight of the mussel bionic compound, a content of polyacrylamide is 65 wt % to 85 wt %; and a content of the mussel bionic catechol compound is 15 wt % to 35 wt %.

9. The self-repairing gel according to claim 8 , wherein based on a total weight of the mussel bionic copolymer, a content of the structural unit A is 85 wt % to 90 wt %, and a content of the structural unit B is 10 wt % to 15 wt %; and
based on a total weight of the mussel bionic compound, a content of polyacrylamide is 75 wt % to 80 wt %; and a content of the mussel bionic catechol compound is 20 wt % to 25 wt %.

10. The self-repairing gel according to claim 1 , wherein the vinyl-containing mussel bionic catechol group monomer is selected from one or more of compounds with a structure as shown in a formula (1),

wherein R 1 is —H or —CH 3 ;
the mussel bionic catechol compound is selected from one or more of compounds with a structure as shown in a formula (2),

wherein R 2 is any one of —COOH, —OH, —C n H 2n NH 2 , —(CHO) x — and —C n H 2n+1 and/or R 3 is —H or —OH;
wherein x is an integer from 1 to 6, and/or n is an integer from 1 to 12.

11. The self-repairing gel according to claim 10 , wherein the mussel bionic catechol compound is selected from one or more of dopamine, tannin acid, catechin, ellagic acid and gallic acid;
the vinyl monomer is selected from one or more of acrylic acid, methacrylic acid, ethylacrylic acid, propylacrylic acid, butylacrylic acid, amylacrylic acid, hexylacrylic acid, acrylamide, methacrylamide, ethylacrylamide, propylacrylamide, butylacrylamide, amylacrylamide and hexylacrylamide; and
the cross-linking agent is selected from one or more of water-soluble phenolic resin, polyethyleneimine and polypropyleneimine.

12. The self-repairing gel according to claim 11 , wherein the mussel bionic catechol compound is selected from dopamine and/or tannin acid;
the vinyl monomer is selected from acrylamide and/or acrylic acid; and
the cross-linking agent is selected from water-soluble phenolic resin and/or polyethyleneimine; and a weight-average molecular weight of the water-soluble phenolic resin is 5000 g/mol to 30000 g/mol; and a weight-average molecular weight of polyethyleneimine is 1500 g/mol to 10000 g/mol.

13. The self-repairing gel according to claim 1 , wherein conditions of the aging and gelatinizing comprise: a temperature of 60° C. to 90° C., and a time of 24 h to 72 h.

14. A method for preparing the self-repairing gel according to claim 1 , comprising the following steps:
(1a) in the presence of an initiator and a chain transfer agent, performing a copolymerization reaction with a vinyl monomer and a vinyl-containing mussel bionic catechol group monomer to obtain a mussel bionic copolymer; and/or
(1b) mixing an aqueous solution of a mussel bionic catechol compound and an aqueous solution of polyacrylamide to obtain a mussel bionic compound; and
(2) performing aging and gelatinizing on the mussel bionic copolymer and/or the mussel bionic compound and a cross-linking agent to obtain the self-repairing gel.

15. The method according to claim 14 , wherein in the step (1a), a weight ratio of the vinyl monomer to the vinyl-containing mussel bionic catechol group monomer to the initiator to the chain transfer agent is (61-76):(7-12):(0.08-0.15):(0.2-0.5).

16. The method according to claim 14 , wherein the initiator is selected from 2,2′-azobis[2-methylpropionamidine]dihydrochloride and/or 1,2-bis(2-(4,5-dihydro-1H-imidazol-2-yl)propan-2-yl)diazene dihydrochloride; and the chain transfer agent is selected from one or more of water-soluble dithiocarbonate, water-soluble xanthate and water-soluble trithiocarbonate.

17. The method according to claim 14 , wherein in the step (1a), the copolymerization reaction is carried out at 55° C. to 70° C. for 4 h to 8 h.

18. The method according to claim 14 , wherein in the step (1b), a weight ratio of the mussel bionic catechol compound to polyacrylamide is (5-10):(25-30).

19. The method according to claim 14 , wherein in the step (2), a weight ratio of the mussel bionic copolymer and/or the mussel bionic compound to the cross-linking agent is (0.2-0.5):(6-1.2).

20. A self-growth gel particle profile control and water plugging agent, wherein the profile control and water plugging agent is formed, through blending and shearing, by the self-repairing gel according to claim 1 and water.

Assignees

• Univ China Petroleum East China

Inventors

• Dai Caili
• Li Lin
• Liu Jiawei
• Xu Zhongzheng
• Zhao Guang
• Zhao Mingwei
• Wu Yining
• Sun Yongpeng

Classifications

• C08L2312/04

  with phenolic resin · CPC title

• C08L79/02

  Polyamines · CPC title

• C08F220/56

  Acrylamide; Methacrylamide · CPC title

• C09K8/887

  containing cross-linking agents · CPC title

• C09K8/512 Primary

  containing cross-linking agents · CPC title