Study on Oil Displacement Performance of Rhamnolipid Compound Imbibition Agent in Fracturing Fluid

In view of the problem that low permeability reservoirs are mainly transformed by volumetric fracturing, which cannot continuously improve production and increase the validity period of well development, the low-damage fracturing fluid with aspiration function was studied, and firstly, the combination experiments of rhamnolipid, sulfamic acid anionic surfactant APS-12 and sodium hydroxide were carried out, and the interfacial tension, wettability, oil washing ability, emulsion viscosity reduction and microscopic oil displacement mechanism of rhamnosin compound suctionant were obtained. The experimental results show that the rhamnolipid compound permeate has a strong ability to reduce the interfacial tension of the polymer fracturing fluid, and when the concentration is greater than 0.4%, the ability to reduce the interfacial tension is weakened, and the oil film peeling process takes a certain time, because it takes a long time to transform the hydrophobic substrate surface into hydrophilic. Different concentrations of rhamnosin compound absorbent mixed with heavy oil can form a better emulsion, reduce the viscosity of crude oil, and play a role in emulsification and viscosity, but the washing ability of oil sands at room temperature is limited. However, in the static aspiration experiment at 60 ℃, guanidine gum and polymer fracturing liquid with the same concentration of rhamnosin compound absorbent can exert the effect of permeation, and it is found that it reduces the binding ability of the rock surface to crude oil through microscopic oil flooding experiments, and the surface hydrophilicity gradually becomes stronger, and the capillary force in the pore throat changes from inhibiting the movement of oil droplets to the main driving force of oil droplets, and the functional type of fracturing fluid is expanded.