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Nonionic polyacrylamide (NPAM) with controlled molecular weight was successfully synthesized as a gel fracturing fluid by aqueous solution polymerization. The effects of the monomer concentration, initiator concentration, reaction time, feeding
known that the gelling solution prepared with high molecular weight PAM possesses high initial viscosity. This would make it di cult on the injection process for water shuto treatment. Fortunately, gel systems prepared with nonionic polyacrylami