This paper establishes a comprehensive framework for applying multi-segment Arps production decline models in multi-fractured horizontal wells. While the industry employs two or three-segment Arps models for production forecasting, this study propels into a minimum of four segments. Investigations of controlling flow equations for idealized conditions reveals the anticipation of early transient linear flow (b ≡ 2), a transition flow regime with regularly varying b, and boundary-dominated flow with b ≡ 0 for fluids with small and constant compressibility. We have found that b values usually range from 0.3 to 0.4 and from 0.4 to 0.5 for depletion drive oil wells and gas wells respectively. For multi-fractured horizontal wells, the study identifies at least four distinct flow regimes: an early ramp-up, a transient flow regime with constant b, a transition flow regime lasting over a log cycle with continuously changing b, and boundary-dominated flow with constant b (0.3 < b < 0.5 in most cases). Forecasting should involve estimating the durations of these flow regimes and predicting when they are expected to begin and end, significantly enhancing the accuracy of individual well forecasts and the construction of typical well production profiles.