Natural gas hydrate is an energy resource for methane that has a carbon quantity twice more than all traditional fossil fuels combined. However

their practical application in the field has been limited due to the challenges of long-term preparation

high costs and associated risks. Experimental studies

on the other hand

offer a safe and cost-effective means of exploring the mechanisms of hydrate dissociation and optimizing exploitation conditions. Gas hydrate decomposition is a complicated process along with intrinsic kinetics

mass transfer and heat transfer

which are the influencing factors for hydrate decomposition rate. The identification of the rate-limiting factor for hydrate dissociation during depressurization varies with the scale of the reservoir

making it challenging to extrapolate findings from laboratory experiments to the actual exploitation. This review aims to summarize current knowledge of investigations on hydrate decomposition on the subject of the research scale (core scale

middle scale

large scale and field tests) and to analyze determining factors for decomposition rate

considering the various research scales and their associated influencing factors.