Numerical simulation-based correction of relative permeability hysteresis in water-invaded underground gas storage during multi-cycle injection and production

ZHU Sinan,SUN Junchang,WEI Guoqi,ZHENG Dewen,WANG Jieming,SHI Lei,LIU Xianshan

Table 1 3D geologic model parameters.

Parameter Value Parameter Value Grid spacing along the X-axis 10 m Average permeability along the Z-axis 1.23×10-3 μm2 Grid spacing along the Y-axis 10 m Average permeability in gas-bearing area 19.00×10-3 μm2 Grid spacing along the Z-axis 2 m Initial formation pressure 24.35 MPa Number of grids along the X-axis 200 Elevation of gas-water contact -2475 m Number of grids along the Y-axis 200 Average reservoir thickness 35 m Number of grids along the Z-axis 31 Geologic reserves 10.28×108 m3 Area of structure 4 km2 Pore volume containing gas 467.69×104 m3 Elevation of structure top -2435 m Grid-water pore volume 3180×104 m3 Maximum dip angle 10° Gas density 0.81 kg/m3 Average porosity 15.25% Formation water density 1018 kg/m3 Average permeability along the X-axis 13.50×10-3 μm2 Formation water viscosity 0.397 mPa?s Average permeability along the Y-axis 13.50×10-3 μm2 Formation water compressibility 3.97×10-6/MPa-1