Pressure interference between Multi-Fractured Horizontal Wells (MFHW) provides direct evidence of hydraulic connectivity inside the Stimulated Reservoir Volume (SRV) and constitutes a key diagnostic indicator for characterizing unconventional reservoirs. However, conventional pressure transient analysis techniques based on type-curve matching or extended flow-regime identification often become difficult to apply under fracture-dominated interference conditions. This work presents an extension of the Tiab’s Direct Synthesis (TDS) methodology for estimating fracture connectivity and transport parameters in hydraulically connected MFHW systems using characteristic features identified in pressure derivative log-log responses. The proposed formulation introduces direct analytical expressions for determining the interference coefficient, the degree of interference, the hydraulic fracture half-length, and the dimensionless fracture conductivity from diagnostic derivative points, including the minimum derivative within the interference region, the derivative maximum following linear flow, and the intersection between the 0.5 and 5/4 slopes.

The methodology is validated using synthetic interference responses generated from analytical solutions describing partially interconnected hydraulic fractures. Results show excellent agreement between input parameters and estimated values, confirming the robustness of the proposed interpretation workflow. Although only two representative examples are presented for clarity and space considerations, additional validation cases reported by [1] further support the applicability of the method across multiple fracture configurations.

The proposed approach provides a practical alternative to conventional interpretation techniques and extends the applicability of TDS to multiwell interference environments typical of unconventional reservoirs.