Comparative Study of Oil Recovery Using Amphoteric Terpolymer and Hydrolyzed Polyacrylamide
Gussenov I.S. Mukhametgazy N. Shakhvorostov A.V. Kudaibergenov S.E.
August 2022MDPI
Polymers
2022#14Issue 15
This paper presents the viscosifying and oil recovery efficiencies of a novel high-molecular-weight ternary polyampholyte (TPA), composed of 80 mol.% acrylamide (AAm) (a nonionic monomer), 10 mol.% 2-acrylamido-2-methyl-1-propanesulfonic acid sodium salt (AMPS) (an anionic monomer), and 10 mol.% (3-acrylamidopropyl) trimethylammonium chloride (APTAC) (a cationic monomer), in various high-salinity brines as compared to the efficiency of hydrolyzed poly(acrylamide) (HPAM), which is the most commonly used polymer in oil production. The results show that, in a range of salinity from 200 to 300 g∙L−1, the viscosity of the TPA solution is rather high and relatively stable, whereas that of HPAM severely decreases. The ability of TPA to increase its viscosity in extremely high salinity brines is explained by the antipolyelectrolyte effect, resulting in the unfolding of macromolecular chains of charge-balanced polyampholytes at a quasi-neutral state, which occurs due to the screening of the electrostatic attraction between oppositely charged moieties. The novelty of this research is that, in high-salinity reservoirs, the amphoteric terpolymer Aam-AMPS-APTAC may surpass HPAM in oil displacement capability.
antipolyelectrolyte effect , hydrolyzed poly (acrylamide) (HPAM) , oil recovery factor (ORF) , polymer flooding , sand-pack model , ternary polyampholyte (TPA) , water flooding
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Institute of Polymer Materials and Technology, Almaty, 050019, Kazakhstan
Department of Petroleum Engineering, Satbayev University, Almaty, 050013, Kazakhstan
Institute of Polymer Materials and Technology
Department of Petroleum Engineering
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