Studies on a Foam System of Ultralow Interfacial Tension Applied in Daqing Oilfield after Polymer Flooding

Studies on a Foam System of Ultralow Interfacial Tension Applied in Daqing Oilfield after Polymer Flooding

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In order to study the effects of oil displacement by a foam system of ultralow interfacial tension, the interfacial activities and foam properties of a nonionic copyright surfactant (DWS) were investigated under Daqing Oilfield reservoir conditions.Injection methods and alternate cycle of the foam system were discussed here on the basis of results from core flow experiments.It was obtained that the surface tension of DWS was approximately 25 mN/m, invertatop squeeze bottle and ultralow interfacial tension was reached between oil and DWS with a surfactant concentration between 0.05wt% and 0.4wt%.

The binary system showed splendid foam performances, and the preferential surfactant concentration was 0.3wt% with a polymer concentration of 0.2wt%.When gas and liquid were injected simultaneously, flow control capability of the acupatch foam reached its peak at the gas-liquid ratio of 3 : 1.Enhanced oil recovery factor of the binary foam system exceeded 10% in a parallel natural cores displacement after polymer flooding.