Relationship between viscosity measurement curve and emulsion characteristics of heavy oil
During chemical flooding of heavy oil,the viscosity reducing agent concentration has obvious in-fluence on the emulsification of heavy oil.The viscosity and viscosity reduction rate are used as indica-tors.By measuring the viscosity time curve of heavy oil emulsion with different viscosity reducing agent concentration,the relationship between viscosity curve and emulsion characteristics was analyzed.The re-sult showed that when the concentration of viscosity reducer is much larger than the critical emulsion con-centration,a stable O/W emulsion is formed with low viscosity and viscosity reduction rate greater than 95%.When the concentration of viscosity reducing agent is greater than the critical emulsion concentra-tion,O/W emulsion is formed,and then with the migration of surfactant to oil phase,oil droplets coalesce and stratify.When the concentration of viscosity reducer is equal to the critical emulsion concentration,the emulsion oil O/W is converted to W/O,and the viscosity is greatly improved.When the concentration of viscosity reducer is less than the critical emulsion concentration,only W/O emulsion can be formed.
heavy oilemulsifyviscosityviscosity reductiontype of emulsion
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