Abstract
The present work had the purpose of developing a class of terpolymer plugging microspheres for petroleum engineering. The terpolymer microspheres were prepared by dispersion copolymerization of acrylamide (AM), sodium 4-styrenesulfonate (SSS) and 2-acrylamido-2- methyl propane sulfonic acid (AMPS), using ethanol/deionized water as dispersion medium, polyvinyl pyrrolidone (PVP) as dispersant, N,N-methylenebisacrylamide (MBA) as crosslinking agent and potassium persulfate (KPS) as initiator. The influences of dispersion medium volume ratio, concentration of dispersant, pH value and stirring speed on the stability of dispersion system were investigated. The results showed that the stable dispersion system was obtained when ethanol-water ratio was 50:50 (v: v), the dispersant content was 15 wt. % (total mass of monomers), pH value was 7 and stirring speed was 200 r/min, which was suitable for ternary dispersion polymerization. FTIR spectrum and SEM images indicated the structure and surface morphology of microspheres.
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