Synthesis and Properties of AM-AA-SSS-DMCAAC16 Hydrophobic Associating Polymer

A hydrophobic associative polymer (AM-AA-SSS-DMCAAC 16 ) was synthesized using the aqueous polymerization method with acrylic acid (AA), acrylamide (AM), sodium styrene sulfonate (SSS), and hexadecyl dimethylallyl ammonium chloride (DMCAAC 16 ) as the main raw materials and ammonium persulfate sodium bisulfite as the initiator. The synthesis conditions for AM-AA-SSS-DMCAAC 16 are as follows: a total monomer mass concentration of 25%, an initiator dosage of 0.2% of the total monomer mass, a reaction temperature of 40°C, and a reaction time of 4 h. The structure of AM-AA-SSS-DMCAAC 16 was characterized by infrared spectroscopy, nuclear magnetic resonance hydrogen spectroscopy, and scanning electron microscopy. The viscosity enhancement, shear resistance, temperature resistance, salt resistance, and oil displacement performance of AM-AA-SSS-DMCAAC 16 were studied. The experimental results showed that the apparent viscosity of the 2000 mg/L AM-AA-SSS-DMCAAC 16 solution prepared with injected water at 25°C was significantly higher than that of the same concentration of acrylamide and acrylic acid binary copolymer (AM-AA) solution. The viscosity of a 2000 mg/L AM-AA-SSS-DMCAAC 16 solution prepared with a 5000 mg/L sodium ion solution is 247.27 mPa s, which is 137.34 mPa s higher than the same concentration of AM-AA solution. After mechanical shearing at 28,000 r/min for 30 s, the viscosity retention rate of the 2000 mg/L AM-AA-SSS-DMCAAC 16 solution was 11.99% higher than that of the same concentration AM-AA solution. Under the same experimental conditions, the enhanced oil recovery rates of AM-AA and AM-AA-SSS-DMCAAC 16 were 11.28% and 17.49%, respectively, and AM-AA-SSS-DMCAAC 16 showed good oil displacement ability.