Experimental Study on Saturation Distribution of Heterogeneous Reservoir

Abstract

Polymer flooding has a large-scale promotion in Daqing oilfield, this paper prepared two-dimensional heterogeneous model according to the typical reservoir in Daqing oilfield and did the experiments of water flooding and polymer flooding with the method of three tubes parallel, monitored the oil saturation distribution in the process of displacement timely by using the advanced saturation monitoring method. The results show that, the recovery rate was 30.35% in the water flooding stage and improve the degree of recovery to 8.28% in the polymer flooding stage. The mainstream channels in the high permeability layer was formed and occurred the phenomenon of fingering in each layers after water flooding, the remaining oil is mainly distributed in the medium and low permeability layer. The polymer advanced to the high permeability layer and increased the injection pressure and the amount of liquid absorption of the medium and low permeability layer after polymer injection, the distribution of remaining oil mainly in low permeability layer after polymer flooding. Keywords-saturation distribution; the remaining oil; sweep efficiency; oil saturation monitoring technology; polymer flooding