US 12,270,757 B1
Method for determining dynamic adsorption retention of polymer capsules
Bei Wei, Qingdao (CN); Yongsheng Liu, Qingdao (CN); Jian Hou, Qingdao (CN); Jiahe Sun, Qingdao (CN); Kang Zhou, Qingdao (CN); Yu Xue, Qingdao (CN); Ningyu Zheng, Qingdao (CN); Qingjun Du, Qingdao (CN); Xuwen Qin, Qingdao (CN); and Yongge Liu, Qingdao (CN)
Assigned to CHINA UNIVERSITY OF PETROLEUM (EAST CHINA), Qingdao (CN)
Filed by CHINA UNIVERSITY OF PETROLEUM (EAST CHINA), Qingdao (CN)
Filed on Nov. 10, 2024, as Appl. No. 18/942,721.
Int. Cl. G01N 21/33 (2006.01)
CPC G01N 21/33 (2013.01) 9 Claims
OG exemplary drawing
 
1. A method for determining dynamic adsorption retention of polymer capsules, comprising:
(1) carrying out a thermal aging experiment to establish relational expressions between a capsule concentration and an aging time, as well as a polymer release concentration and the aging time;
measuring an absorbance of different concentrations of polymer solutions, and drawing a standard curve between a polymer solution concentration and the absorbance; preparing a series of polymer capsule concentrations, and triggering and releasing encapsulated polymers to establish a relational expression between the capsule concentration and a complete release concentration of polymers; and establishing a relational expression between the polymer release concentration and the aging time, as well as a relational expression between a concentration of unreleased polymers encapsulated by capsules and the aging time through the thermal aging experiment;
(2) setting up a polymer capsule displacement experimental device to determine a release concentration of polymers in effluent;
carrying out a polymer capsule displacement experiment, periodically acquiring an effluent, then diluting the effluent, filtering and removing capsule particles in a diluted solution, and determining an absorbance value of the diluted solution to obtain the release concentration of polymers in an effluent based on the standard curve between the polymer solution concentration and the absorbance in step (1);
(3) releasing polymers encapsulated by capsules in the effluent to acquire a total adsorption retention of polymers in a porous medium;
performing a thermal aging experiment after diluting the effluent, comprising: sealing and placing the effluent at a reservoir temperature for complete triggering to release encapsulated polymers; and determining a total polymer concentration of the effluent; and
(4) inverting respective adsorption retentions of the capsule particles and the polymers in the porous medium;
calculating a concentration of polymers encapsulated by remaining capsule particles in the diluted solution based on the release concentration of polymers in the effluent before an effluent triggering in step (2) and the total polymer concentration of the effluent after the effluent triggering in step (3); and
inverting respective adsorption retentions of the capsule particles and polymer molecules in the porous medium according to the relational expressions between the polymer release concentration and the aging time, as well as the concentration of unreleased polymers encapsulated by capsules and the aging time, and the standard curve between the polymer solution concentration and the absorbance obtained in step (1).