Effect of surfactants on wettability of near-wellbore regions of gas reservoirs

摘要: Abstract The flow of gas in tight, low-pressure wells can be partially blocked by the water saturation build-up near hydraulic fracture face if drawdown pressure does not exceed capillary pressure. To increase productivity, may reduced alteration near-wellbore wettability from water-wet conditions to intermediate-wet conditions. Many surfactants have been identified which change carbonate and sandstone rocks water–air–rock systems. Among fluorosilanes, as number fluoro groups increases, become less water-wet. One day aging period 1 wt.% concentration appear sufficient for altering wettability. Interaction with field brine plays a crucial role selection appropriate surfactants. relative permeability due is function gradient.