Research On Injectivity Of ASP System Suit To Daqing ClassⅡ Oil Layer

With the progress of exploration, Daqing oil field has turned into high-water period. ASP flooding is another important EOR technology after polymer flooding. Field application indicates that ASP flooding can enhance oil recovery over 20%, but many problems follows. Among of them, the most severe effect on formation is that alkaline can lower formation permeability because it can disperse formation clay and make them move and swell. Alkali scale forms after it reacts with formation fluid and rock, which does harm to formation. At the same time, alkali scale forms in the oil well to reduce the production, shortens period of checking pump etc. Alkali makes it difficult to demulsify for production fluid and can lower largely viscoelasticity of polymer.Therefore the ASP drive need weaken alkali base.This article takes the base of Research on injectivity of ASP system polymer suit to classâ…¡oil layer as the main research content, the experimental studying to the ASP system polymericular weight match to permeability. And studying to the system interfacial tension performance,the viscosity performance, the perquisite adaptation performance and so on has been carried on the experimental appraisal.Moreover through opened in the exhibition room the physical analogue to drive the oil experiment to suit classâ…¡oil layers the ASP system to carry on has driven the oil effect appraisal. The experimental result indicated that this ternary system can achieve the 10-3mN/m magnitude with three factory crude oil interfacial tension in the wide active ingredient density scope; The system viscosity and the interfacial tension stability is good; The ternary system polymericular weight selecting result provides the support for the the physical analogue experiment in room. The experiment result of driving the oil to indicate the weak base ASP system may enhance classâ…¡oil layer recovery above 18% .