Experimental study on surface-active polymer flooding for enhanced oil recovery: A case study of Daqing placanticline oilfield, NE China

YU Qiannan,LIU Yikun,LIANG Shuang,TAN Shuai,SUN Zhi,YU Yang

Table 2 Pressure differences in different parts of the core.

Chemical agents	Pressure differences in different parts/MPa
Chemical agents	Front(p₁-p_in)	Central(p₂-p₁)	Rear (p_out-p₂)
Surface-active polymer	0.361	0.038	0.001
Binary compound system	0.057	0.021	0.015
Polymer	0.033	0.019	0.017