Enhanced depressurization for Methane Recovery from Hydrate-bearing Sediments by Ethylene Glycol Pre-injection

Abstract In this work, the gas production behaviours from synthesized methane hydrate reservoir by the combined method of ethylene glycol (EG) pre-injection and depressurization was investigated in a medium size three-dimensional reactor. The results indicated that the production period could be significantly shortened by this combination method. The characteristics of EG migration were largely influenced by injection rate, which caused different gas production rates in the follow-up process. In addition, EG efficiency could be enhanced by adjusting EG injection rates.