Abstract
In this article, a novel kind of temperature‐resistant thickening agent (LK) was copolymerized with acrylamide, acrylic acid, sodium p‐styrenesulfonate, and dimethyl diallyl ammonium chloride via free radical copolymerization. The polymerization conditions were optimized by the single‐variable method. Subsequently, the structure of the copolymer was characterized through Fourier transform infrared spectroscopy and proton nuclear magnetic resonance. Thermal gravimetric analysis demonstrates that the thickening agent LK has an excellent ability of temperature‐resistance and the degradation temperature of the copolymer is higher than 300°C. The 3‐dimensional network structure formed in the fracturing fluid was observed via experimental results of scanning electron microscopy. Several aspects of the properties of fracturing gel system, such as temperature and shear tolerance, salt resistance and viscoelasticity, and gel breaking and filter loss were evaluated. Results indicates that the fracturing gel system presents good comprehensive performances under high‐temperature condition.
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