Surfactant that changes the wettability of tight sandstone and its preparation method and application

摘要: A surfactant that changes the wettability of tight sandstone and its preparation method application. By adding aqueous phase solution into oil solution, under action emulsifier, a uniformly dispersed is achieved. Then initiator, stirring raising temperature, reacting reaction at temperature to obtain colorless transparent liquid, i.e., high polymer. At room fluorocarbon biosurfactant was continued for 4 hours surface sandstone. The present invention can reduce oil-water interfacial tension, transform oil-wet water-wet surface, which reduces adhesion droplets rock improves flowability crude in original stratum, recovery low-permeability reservoir.