Research Article

Main Controlling Factor of Polymer-Surfactant Flooding to Improve Recovery in Heterogeneous Reservoir

Table 4

Experiment data of oil displacement efficiency.

NumberPolymer concentrationSurfactant concentrationViscosity, mPa⋅sIFT mN/mWater flooding Recovery, %chemical flooding Recovery, %Incremental Recovery, %

(1)1500039.6739.9849.219.23
(2)00.30.6740.4243.352.93
(3)15000.34040.1553.5513.40
(4)20000.351.6441.1155.0913.98
(5)15000.239.4738.9750.0811.11
(6)15000.438.7940.3453.8613.52
(7)15000.328.9738.9243.975.02