Investigation of the Flow Intensity in an Inverted Seven-Point Well Pattern and Its Influence on the EOR Efficiency of S/P Flooding

Polymer and surfactant (S/P) binary flooding is a widely used chemical technology for enhanced oil recovery (EOR). However, it mostly in the five-spot well pattern, there little research on effect of patterns its flow law EOR efficiency reservoir. In this paper, intensity S/P an inverted seven-spot unit are investigated. Based theoretical derivation simulation, distribution at different positions pattern was calculated. The displacement evaluated by simulating intensities with various velocity. microscopic residual core end scanned recognized. 2D model to simulate clarify flooding. results show that swept area can be divided into strong region (>0.2 MPa); medium (0.1–0.2 weak (0.03–0.1 invalid (<0.03 MPa), according pressure gradient distribution. Compared featured intensity, but large lower water cut rise rate. Increasing improve efficiency, disperse displace continuous cluster remaining oil. experiments incremental recoveries SP after 25.73% 17.05%, respectively. ultimate two similar considering previous