In offshore oil and gas production, hydrate formation in subsea pipelines poses a significant flow assurance challenge, particularly in deepwater environments where ambient seawater temperatures hover near 4°C and operating pressures exceed 100 bar. This study investigates the effectiveness of various thermal insulation strategies for deepwater flowlines, focusing on their ability to delay pipeline cooldown and prevent hydrate formation during normal operation and transient shutdown scenarios. The research evaluates and compares commonly used wet insulation systems (such as polypropylene and syntactic foam coatings) with dry insulation methods, particularly pipe-in-pipe (PIP) configurations. A series of transient thermal simulations are conducted using OLGA to analyze heat retention performance, cooldown rates, and hydrate risk profiles for pipelines at depths ranging from 1,000 to 2,500 meters. Critical parameters such as insulation thickness, thermal conductivity, and shutdown duration are varied to assess their influence on the hydrate safety margin. The results demonstrate that while wet insulation is sufficient for short tie-backs and low-water-cut fluids, pipe-in-pipe systems offer significantly enhanced thermal protection for longer flowlines and complex deepwater developments. The study also proposes a design decision matrix based on technical feasibility, hydrate risk level, and cost implications. This research provides a comprehensive guide for selecting optimal insulation strategies in hydrate-prone offshore fields, contributing to safer and more efficient subsea production system designs.