Double-response self-degradable temporary plugging agent and preparation method thereof

Patent metadata

Field	Value
Publication number	US-11959015-B2
Application number	US-202117341504-A
Country	US
Kind code	B2
Filing date	Jun 8, 2021
Priority date	Jun 8, 2020
Publication date	Apr 16, 2024
Grant date	Apr 16, 2024

Abstract

Disclosed are a double-response self-degradable temporary plugging agent and a preparation method thereof. The double-response self-degradable temporary plugging agent is prepared by compounding a crosslinkable monomer with a temperature-sensitive degradability and an inorganic material with an acid solubility with a first monomer, a dispersant, an initiator and water, and subjecting the resulting mixture to a polymerization.

First claim

What is claimed:

1. A double-response self-degradable temporary plugging agent, which is prepared by polymerization of raw materials comprising, in parts by weight, 32 parts of a monomer, 1-5 parts of a reinforcing agent, 0.1-0.6 parts of a dispersant, 0.07-0.12 parts of an initiator, 2-10 parts of a hydrophobic nano-powder and 60-90 parts of water, wherein
the monomer comprises a first monomer and a second monomer, wherein the first monomer is at least one selected from the group consisting of a propylene monomer, a styrene monomer, itaconic acid, acrylic acid and maleic anhydride, and the second monomer is a temperature-sensitive degradable crosslinkable monomer, being at least one selected from the group consisting of 1,4-butanediol dimethacrylate, ethylene dimethacrylate and a poly(ethylene glycol) diacrylate; and
the reinforcing agent is an acid-sensitive material.

2. The double-response self-degradable temporary plugging agent as claimed in claim 1 , wherein the hydrophobic nano-powder is at least one selected from the group consisting of a hydrophobic nano-SiO 2 and a hydrophobic nano-TiO 2 .

3. The double-response self-degradable temporary plugging agent as claimed in claim 1 , wherein the styrene monomer is sodium p-styrenesulfonate.

4. The double-response self-degradable temporary plugging agent as claimed in claim 1 , wherein the dispersant is at least one selected from the group consisting of a poly(vinyl alcohol), a polyacrylamide, a partially hydrolyzed polyacrylamide and a salt-resistant polyacrylamide.

5. The double-response self-degradable temporary plugging agent as claimed in claim 1 , wherein the reinforcing agent is at least one selected from the group consisting of a soluble starch, a nano-calcium carbonate, a chitosan and calcium stearate.

6. The double-response self-degradable temporary plugging agent as claimed in claim 1 , wherein the initiator is at least one selected from the group consisting of ammonium persulfate, potassium persulfate, sodium thiosulfate, sodium bisulfate and 2,2′-azobis(2-methylpropionamidine) dihydrochloride.

7. The double-response self-degradable temporary plugging agent as claimed in claim 2 , wherein the styrene monomer is sodium p-styrenesulfonate.

8. The double-response self-degradable temporary plugging agent as claimed in claim 2 , wherein the dispersant is at least one selected from the group consisting of a poly(vinyl alcohol), a polyacrylamide, a partially hydrolyzed polyacrylamide and a salt-resistant polyacrylamide.

9. The double-response self-degradable temporary plugging agent as claimed in claim 2 , wherein the reinforcing agent is at least one selected from the group consisting of a soluble starch, a nano-calcium carbonate, a chitosan and calcium stearate.

10. The double-response self-degradable temporary plugging agent as claimed in claim 2 , wherein the initiator is at least one selected from the group consisting of ammonium persulfate, potassium persulfate, sodium thiosulfate, sodium bisulfate and 2,2′-azobis(2-methylpropionamidine) dihydrochloride.

11. A method for preparing the double-response self-degradable temporary plugging agent as claimed in claim 1 , comprising,
weighing each raw material according to the composition of the double-response self-degradable temporary plugging agent as claimed in claim 1 ;
dissolving the first monomer, the second monomer, the dispersant, the reinforcing agent, the hydrophobic nano-powder and the initiator in water to obtain a liquid mixture, and stirring the liquid mixture, to obtain a dried mixture; and
subjecting the dried mixture to a polymerization at a temperature of 30-60° C., to obtain a dry powdery microsphere including the double-response self-degradable temporary plugging agent.

12. The method as claimed in claim 11 , wherein stirring the liquid mixture is performed at a rate of 3000-20000 r/min for 0.5-5 min.

Assignees

• Univ Yangtze

Inventors

• Yu Xiaorong
• Yang Huan
• Wang Kailu
• Wang Wei

Classifications

• C09K8/5083 Primary

  obtained by reactions only involving carbon-to-carbon unsaturated bonds · CPC title

• C04B14/06

  Quartz; Sand · CPC title

• C04B14/28

  of calcium · CPC title

• C04B14/305

  Titanium oxide, e.g. titanates · CPC title

• C04B16/02

  Cellulosic materials (cellulosic waste materials, e.g. sawdust, rice husks, C04B18/24) · CPC title