The invention constructs a
fracture conductivity evaluation method considering shale hydration. The method mainly comprises the following steps: 1, carrying out a triaxial hydration
creep mechanics experiment, establishing an elastic-viscoelastic-viscous plastic multi-stage
creep constitutive equation based on triaxial experiment data, and analyzing shale elastic and viscous deformation mechanisms; 2, secondly, constructing a shale
creep constitutive model by stages according to a stress threshold value, describing a viscoelastic stage by adopting an improved Burgers model, and establishing a viscoplastic strain equation based on an overstress theory; 3,
coupling hydration action parameters to correct a shale creep equation, and quantifying the influence of hydration on rock modulus,
viscosity coefficient and yield stress; 4, the
creep strain and the crack dynamic width are correlated through a
mathematical model, and a multi-field
coupling relation is established in combination with a permeability
evolution rule; and 5, finally constructing a
fracture conductivity prediction model when the hydration effect is considered, and realizing
fracture conductivity dynamic analysis under the hydration-creep synergistic effect. According to the method, the shale hydration-creep
coupling effect is creatively fused into fracture
conductivity prediction, and a quantitative tool is provided for shale reservoir long-term productivity evaluation.