A PROSPECT REVIEW OF NEW TECHNOLOGY FOR DEVELOPMENT OF MARINE GAS HYDRATE RESOURCES

With the rapid development of marine gas hydrate exploration and the upgrading of oil and gas mining technology around the world, the prospect of commercial exploitation of gas hydrate resources in deep-water is gradually emerged. Since 2013, Japan and China have carried out several times of trial productions of marine hydrates and the continuous gas production time, cumulative gas production and daily average gas production have been gradually improved. In 2020, China took the lead in realizing the leap from "exploratory production" to "test production". However, the amount of single well production with "depressurization" as the core concept restricted the industrialization development seriously. It is necessary to innovate and develop the existing technology and methods to form an more efficient, safe and economic special technology system for marine hydrates recovery. In this paper, new progress in the research and development of natural gas hydrate exploitation technology in the past years have been reviewed, by analyzing the innovation and upgrading progress of various types of exploitation technology, revealing the main problems existed with the philosophies of "in-situ decomposition and extraction" and "in-situ crushing and extraction". On this basis, the research and development direction of natural gas hydrate exploitation technology in the future is prospected.