Abstract
ABSTRACTThe aim of this work was to prepare a novel dendritic branched nano‐thickening agent by free radical polymerization of acrylamide (AM), acrylic acid (AA), sodium p‐styrene sulfonate, dimethyl diallyl ammonium chloride, and multiwalled carbon nanotubes. The as‐synthesized nano‐thickening agent was characterized by Fourier transform infrared, Raman spectra, transmission electron microscope, 1H‐NMR, and thermogravimetric analysis (TGA). Compared with the pristine polymer and partially hydrolyzed polyacrylamide (HPAM), thickening capacity, temperature resistance, and salt tolerance properties of the nano‐thickening agent considerably improved, and the viscosity of 0.5% nano‐polymer solution was 126.5 mPa·s. Additionally, the properties of the nano‐gel prepared by nano‐thickener, such as temperature and shear tolerance, viscoelasticity, sand carrying capacity, and gel breaking performance, were evaluated showing the satisfactory performance of the nano‐gel under high temperature condition. The results indicated that the nano‐thickener has potential applications in the field of oil and gas production. © 2019 Wiley Periodicals, Inc. J. Appl. Polym. Sci. 2020, 137, 48446.
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