Research Article

A Semianalytical Two-Phase Imbibition Model in Dual-Porosity and Dual-Permeability Reservoirs

Table 2

Basic parameters of the proposed model.

ParameterValueUnits

Wellbore radius0.1m
Matrix permeabilityμm2
Fracture permeability0.6μm2
Matrix porosity0.27Fraction
Fracture porosity0.03Fraction
Formation height10m
Water volume factor1Fraction
Oil volume factor1.03Fraction
Irreducible water saturation20%
Residual oil saturation14%
Water viscosity0.5mPa·s
Oil viscosity1mPa·s
Shape factor1/cm2
Injection rate30m3/day
Initial pressure14MPa
Skin factor1Fraction
Rock compressibility1/MPa
Oil compressibility1/MPa
Water compressibility1/MPa
Imbibition rate coefficient0.11/day
Wellbore storage coefficient0.011 m3/MPa