Wettability Alteration to Reduce Water Blockage in Low-Permeability Sandstone Reservoirs

Abstract This study is a continuation of our previous work, which focused on near-wellbore water blockage alleviation by applying thermally cured silane-functionalized benzoxazine to modify rock wettability. In this new analysis, we have demonstrated that the resin can be applied in low-permeability sandstones (approximately 15 mD as opposed 100 200 study) change surface wettability from water-wet intermediate gas-wet. We also curing temperatures low 125 °C (as 180 significantly wettability, indicating functionalization through silane moiety and ring-opening polymerization moiety. drainage core flooding experiments at 2.5 wt.% loading, compared untreated samples, brine recovery increments 6.3 6.9% were obtained for °C, respectively. A maximum 20% increment end-point relative gas permeability was achieved temperature °C. coupled experimental numerical study, conducted wellbore scales, demonstrates potential effectiveness chemical treatment improving productivity field scale. Reservoir simulations indicate 2.9 10.6% improvement deliverability radius 4 16 m,