Effects of pore structure on surfactant/polymer flooding-based enhanced oil recovery in conglomerate reservoirs

LIU Zheyu,LI Yiqiang,LENG Runxi,LIU Zhenping,CHEN Xin,HEJAZI Hossein

Table 6 Oil displacement results of the three full diameter core samples.

Core sample Recovery degree at 90% water cut/% Increment of recovery degree from chemical flooding and subsequent water flooding/% Ultimate recovery degree/% Injected water PV at water breakthrough Unimodal (medium sandstone) 37.31 11.47 48.78 0.17 Bimodal (pebbly coarse sandstone) 28.50 16.01 44.51 0.07 Multimodal (sandy conglomerate) 21.91 21.85 43.76 0.06