Mechanisms of water block removal by surfactant micellar solutions in low permeability reservoirs

LI Junjian,LIU Ben,GUO Cheng,SU Hang,YU Fuwei,MA Mengqi,WANG Lida,JIANG Hanqiao

Table 1. Design of core flowback experiment scheme

Serial number Diameter/ cm Length/ cm Poro- sity/% Water permeability/ mD Fluid type CF-1 2.50 4.03 16.2 5.92 Brine (4% KCl solution) CF-2 2.49 4.08 17.6 3.77 Low salinity system CF-3 2.51 4.01 14.6 4.01 Critical salinity system CF-4 2.52 3.98 15.6 3.53 Optimal salinity system