Comparison of innovative gas hydrate extraction technologies in China and Japan

In the 20th century, great attention in the world was paid to the study, exploration, development of natural gas deposits, which are ordinary (traditional) gas-containing accumulations of hydrocarbons. The limited and irreplaceable resources of free natural gas, the growing demand for this energy carrier inevitably forced in the 21st century to pay attention to the significant potential resources of natural gas contained in unconventional sources. These include coal-bearing methane, shale gas, water-dissolved gases of the underground and aboveground hydrosphere, natural gas hydrates. The authors discuss modern technologies for the development of natural gas hydrates, in particular the pilot development of the Nankai field on the shelf of Japan and a number of large deposits on the shelf of China. The results of scientific research are presented, as well as practical experience in the application of various methods of influencing deposits of unconventional hydrocarbons. The study introduces a number of key technical solutions for the development of gas hydrate deposits, such as sand control during extraction, artificial lifting, geological monitoring and environmental monitoring. The information and regulatory framework of the study reflects the current level of development of science and technology in the development of mineral deposits. The world and domestic experience in the development of technologies for the impact on unconventional hydrocarbon deposits in order to optimize and intensify the production process is reflected.