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Bulk and rheological properties of polyacrylamide hydrogels for water shutoff treatment
Asefe Mousavi Moghadam,Mohsen Vafaie Sefti,Mahsa Baghban Salehi,Hasan Naderi 한국화학공학회 2014 Korean Journal of Chemical Engineering Vol.31 No.3
Presenting an optimal hydrogel for water shutoff, based on the bulk and rheological properties, was themain purpose of this research. To determine gelation time, a bottle test was conducted using central composite designmethod with two factors, AN125VLM and Cr(OAc)3, as copolymer and crosslinker, respectively. To select hydrogelwith high strength network, crosslinking density and consistency modulus were also measured. Hence, a hydrogel with26,340 ppm concentration of copolymer, 0.12 ratio of crosslinker/copolymer, maximum value of crosslinking density(1,950) and consistency modulus (31,900 Pa) was selected as the optimal one. To study the gelation time among differentfactors in porous media, rheological experiments were carried out by Plackett-Burman design to screen the eightfactors (NaCl, CaCl2, KCl and MgCl2 concentrations, temperature, pH, sodium lactate and nanoclay). Accordingly,temperature was the most effective factor controlling the gelation time, while pH and other factors had negligible effecton the gelation time of the optimal hydrogel.
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