Experimental investigation of CDG fluid in heterogeneous physical model

Experimental investigation has been conducted on CDG (Colloidal Dispersion Gels) fluid in heterogeneous physical model, the effects of water flooding, polymer flooding and CDG flooding on EOR are systematically compared. Pressure transducers with high accuracy were installed in the model, and the fluid flow variation in the reservoir was observed. The tests show that polymer flooding enhanced oil recovery 8.7% more than water flooding, and 1.6% more than polymer flooding. According to pressure variation, it is clear that the fluid flow direction could be changed by polymer flooding, expanding sweep region and displacing oil from the low permeability regions. After CDG became colloid, the high permeability regions could be plugged, the fluid flow direction changed and oil recovery enhancement would be achieved.