Research Article

Study on Damage Mechanism of Waterflooding Development in Weizhou 11-4N Low-Permeability Oilfield

Table 5

Throat data before and after the D1 core experiment.

Mainstream throat radius (μm)Maximum throat radius (μm)Average throat radius (μm)Relative sorting coefficientHomogeneity coefficient

Before speed sensitivity experiment3.428.703.840.470.39
After speed sensitivity experiment2.978.203.410.400.38