The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Nov. 19, 2024
Filed:
Jun. 22, 2024
Southwest Petroleum University, Chengdu, CN;
Daijun Du, Chengdu, CN;
Zezhou Fang, Chengdu, CN;
Wanfen Pu, Chengdu, CN;
Jinzhou Zhao, Chengdu, CN;
Yangyang Zhang, Chengdu, CN;
Fayang Jin, Chengdu, CN;
Rui Liu, Chengdu, CN;
Peiwen Xiao, Chengdu, CN;
SOUTHWEST PETROLEUM UNIVERSITY, Chengdu, CN;
Abstract
The present invention discloses a CO2 responsive core-shell multi-stage swelling microsphere and a preparation method thereof. The preparation method comprises the following steps: adding a styrene monomer into a sodium dodecyl sulfate solution for emulsion polymerization to obtain a spherical polystyrene solution, taking azobisisobutyronitrile and ethylene glycol for Pinner reaction to obtain an azo compound with hydroxyl functional groups at two ends, taking the azo compound with the hydroxyl functional groups at two ends as a raw material for Schotten-Baumann reaction with methacryloyl chloride to obtain BPAB, adding the BPAB into the spherical polystyrene solution to prepare an active polystyrene core solution, and dissolving the active polystyrene core solution, acrylamide, a CO2 responsive monomer, a CO2 responsive cross-linking agent and a stable cross-linking agent into water to obtain a target product. The CO2 responsive core-shell multi-stage swelling microsphere of the present invention can remarkably improve the CO2 flooding sweep efficiency.