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Despite some international experience in gas production from gas hydrate deposits, mining companies are faced with a number of issues that have not been resolved so far. Among these issues, the particularly complex ones are technological problems and environmental efficiency. In the present article, there is a substantiation of the need to consider the particular structure of primary (marine) and secondary (land) gas hydrate deposits while choosing the method of extracting gas from them. The analysis of the practical experience of extracting gas from gas hydrate deposits has proved that one of the most effective methods of ecological production of methane from marine gas hydrate deposits might be the method of substitution. The method of decompression (reduced pressure) is the most effective one for development of secondary (land) deposits. The suggested method of technological planes has helped estimate the effectiveness of using hydrate substitutes such as hydrogen sulphide and carbon dioxide. This method has proved a certain advantage of hydrogen sulphide over carbon dioxide due to a larger conventional area of the technological plane and, therefore, a safer range of values of the technological parameters of gas extraction. The obtained results can be used in implementing the technology of gas extraction from hydrate deposits, especially in applying the substitution method to developing offshore deposits.

A method developed to increase technological and ecological efficiency of gas production from hydrate deposits