The Effects of Immobile Water on Hydraulic Fracturing Design Taking Into Account Non-Darcy Flow

The author studied effects of immobile water saturation on hydraulic fracture design. So the effect of immobile water saturation on the non-Darcy flow coefficient characterizing the flow of gas in the reservoir and in the hydraulic fracture was considered. There is single-phase gas flow in both subsystems, but the immobile water saturation affects the actual value of the non-Darcy coefficient. An additional simplification often used in the literature is that in the hydraulic fracture there is no immobile water saturation. The goal of this work was to develop a consistent fracture design procedure taking into account non-Darcy effects on the flow of gas both in the reservoir and in the fracture, but affected by the immobile water saturation only in the reservoir.