Why is combustible ice difficult to mine? What is the current mainstream mining scheme?

"Three more" means more patents, more equipment and more young people. "At present, we have obtained more than 65,438+000 national patents for combustible ice and 5 international patents." Liu Changling, director of the Institute's Natural Gas Hydrate Geology Office, recently said that the number of patents related to combustible ice in the Institute has increased. Last year alone, it won 3 international patents, 7 national invention patents/kloc-0 and 25 national utility model patents. In the laboratory, the reporter saw dozens of combustible ice experimental equipment and devices developed by the team. "Because the research purpose is different from the parameters of the experimental test, the combustible ice simulation experiment needs many types of experimental devices and equipment. Many researches don't have ready-made instruments, so we will develop two or three sets of new equipment every year according to the needs of research. " Liu said:

The reporter learned that at present, the team has developed more than 20 sets of combustible ice experimental devices and equipment, forming more than 30 patented technologies for combustible ice experiments. There are 34 people in the team, including 7 postdoctoral fellows. This young team, with the post-80s generation as the main body, has made important contributions to the development of combustible ice research technology in China. "Direct mining has no effect. Liu Changling said: "Combustible ice is distributed in the cracks of sediments, and its content is very low. Large-scale excavation of sediments will cause serious damage to the seabed environment and cause engineering geological disasters. "

At present, the internationally recognized method of exploiting combustible ice is in-situ decomposition, which changes the stable existence conditions of combustible ice through external force, and decomposes in-situ in the stratum to produce flowing gas and water, which are collected to the ground through oil, natural gas and other mining methods. The total output of this debt test within one month is 8610.4 million cubic meters, with an average daily output of 28,700 cubic meters, which is 2.8 times that of the previous 60 days. Trial production has conquered the core technology of horizontal well drilling in deep water and shallow formation, greatly increased the scale of production period and laid a solid technical foundation for productive trial production and commercial production. China has also become the first country in the world to try to produce natural gas hydrate in this sea area by using horizontal well drilling technology.

Independent research and development of core technologies and equipment systems has realized the industrialization of natural gas hydrate exploration and development, which has greatly improved the ability of deep-sea exploration and development. There are 32 core technologies in 6 categories, of which 6 are dominant. 12 core equipment has been successfully developed, in which the oil well regulating device has broken the foreign monopoly. These technologies and equipment have broad application prospects in the field of marine resources development and marine engineering, which will form a new industrial chain of deep-sea technologies and equipment and strengthen China's ability of "deep-sea entry, deep-sea exploration and deep-sea development".