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In the 2001, China carried out the drilling techniques research and developed conventional and wire-line pressure and temperature coring system for oceanic gas hydrate exploration. The coring system was used for pilot testing in the hole. The test successfully demonstrated the operation of the wire-line pressure and temperature coring system. Since 2001, Institute of Exploration Techniques made significant progress on gas hydrate drilling and coring. In 2005, China started research on the drilling coring system and drilling techniques for its application to the permafrost gas hydrate. In the 2008, first testing of drilling and coring with the new wire-line pressure and temperature coring system for the permafrost gas hydrate in Qing-Tibet Plateau, Qilian Mountain, above sea level of 4200m was conducted to collect gas hydrate samples from 130m to 400m depth.. In order to confirm the presence of gas hydrate, drilling and coring continued in 2009 and 2010, and additional gas hydrate samples were acquired and tested in the laboratory. In order to use the gas hydrate resource, additional testing of the gas hydrate in the permafrost was conducted with depressurization and reservoir heating in September, 2011. During this testing, electro-magnetic, solar energy and vapor heating methods were used, and the reservoir pressure was decreased by the submarine pump by bringing the subsurface water to the surface. The testing was considered successful. The pressure and temperature coring system, the drilling and the production processes and the results are described in the paper

Research Progress of Drilling Coring and Mining on the Permafrost Natural Gas Hydrates in China