Abstract: Concentration measurement of silicon and aluminum in reacting solution of combination flooding system is a key problem for studying chemical behavior of reservoir minerals in alkaline flooding system. The effect of surfactant (OP0) and hydrolyzed polyacrylamide-3430S (HPAM) on concentration measurement of silicon and aluminum have been investigated systematically. Results have shown that HPAM has no effect on the measurement of aluminum when the concentration of HPAM in the formulated solutions is lower than 50μg/ml. The
effect of polymer on silicon concentration measurement is little and may be neglected as long as the polymer concentration is lower than 10μg/ml. The influence of surfactant on silicon and aluminum concentration measurement is very small and may be neglected when surfactant concentration is no more than 10μg/ ml. Therefore, the concentration of polymer and surfactant
should be controlled under 10μg/ml when measuring silicon and aluminum concentration in reacting solution of combination flooding system.

Key words: hydrolyzed polyacrylamide, surfactant, silicon and aluminum, concentration measurement