A PCM-based active temperature-preserved coring method for deep sea natural gas hydrate

• An innovative active temperature-preserved coring method using phase change materials (PCM) is introduced for deep-sea natural gas hydrate (NGH) coring. • The developed active temperature-preserved corer (ATPC) reduces core temperature by more than 5.25 °C compared to passive methods. • A heat transfer model for the ATPC coring process was established and validated with indoor experiments. • ATPC extends the low-temperature state duration of NGH cores to 53.85, 32.87, 20.32, and 11.83 minutes at environment temperatures of 15, 20, 25, and 30 °C, respectively.