Honggang Oil Field Surfactant Polymer Displacement System Formation And Project Optimization

Honggang oil field is medium-lower permeability sandstone reservoir, and its averagepermeability is163×10^-3μm². The resevoir has been developed for about40years. watercut is95%. It is difficult for flooding to improve recovery. By researching, Surfactant Polymerflooding is suitable for the reservoir to enhance the recovery.This project researches to select what kind of water to mix chemical agent, polymer toselect and its compound polymer properties to evaluate, and its compatibility with thepore-throat of reservoir rock. To select Surfactants and its surfactant-polymer interfacialtension, viscosity and displacement efficiency to be evaluated, to optimize chemical floodinginjection parameters.The research result show the surfactant-polymer mixed with low salt water has higherviscosity than high salt water, and stability. Compound polymer is used for compatibility withthe reservoir heterogeneity. To optimize the ratio of compound polymer and the ratio is6:3:1from higher polyacrylamide relative molecular mass to high to medium. At the low salt watercondition, a kind of surfactant “JN-1” is to be selected and the surfactant-polymerdisplacement system formation has the ultra-low interfacial tension with the oil of Honggangoil field. Its interfacial tension and viscosity is stability. It has low adsorption and higherdisplacement efficiency. To recommend the surfactant-polymer displacement systemformation project can increase oil recovery about19.75%comparing to flooding oil recovery.