Efficient muddy silt type natural gas hydrate mining system and mining method thereof

Abstract

The invention provides an efficient muddy silt type natural gas hydrate mining system and a mining method thereof, and belongs to the field of natural gas hydrate mining. The efficient muddy silt typenatural gas hydrate mining system comprises an offshore floating platform, a slurry stirring module, a reaction production module and a product collection module. According to the efficient muddy silt type natural gas hydrate mining system and the mining method thereof, the connectivity of a muddy silt type natural gas hydrate reservoir is transformed by adopting two types of slurry of A type andB type, a gas-water seepage channel in the reservoir is widened, the gas-water seepage capacity is enhanced, the reservoir maintains a good gas-water seepage rate in the process of pressure-reducingmining of natural gas hydrate, generation of ice and secondary hydrate in the reservoir seepage channel is avoided, the long-term effect problem of a pressure-reducing method is solved, and efficientdevelopment of the muddy silt type natural gas hydrate is realized.

Description

technical field [0001] The invention belongs to the technical field of natural gas hydrate exploitation, and in particular relates to an efficient argillaceous silt type natural gas hydrate exploitation system and an exploitation method thereof. Background technique [0002] Natural gas hydrate is a clathrate structure substance formed by the enrichment of small molecule natural gas such as methane and water under low temperature and high pressure conditions. Its appearance is similar to ice, and it can burn, also known as "combustible ice". Compared with other conventional and unconventional oil and gas resources, the advantages of gas hydrate are mainly reflected in the following aspects: high energy density, under standard conditions, 1m 3 The solid gas hydrate can release 164m 3 The energy density of methane is 2-5 times that of natural gas and 10 times that of coal; the distribution range is wide, and natural gas hydrates are widely found in land permafrost and marine...

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Problems solved by technology

Regarding the depressurization method, relevant researchers have proposed a variety of methods to enhance the recovery effect, but there are some problems in the thinking: for example, "Foam grouting method for improving marine muddy silt type natural gas hydrate reservoir", see the application for details No. 2018100545815, using foam grouting, but ignoring the fact that the foam cannot be foamed under actual high-pressure conditions; another example is "A Method for Improving the Efficiency of Natural Gas Hydrate Exploitation Using Fracturing Fluid Containing Anti-swelling Agents", see Patent No. 2009102723926 for details , although considering the addition of anti-swelling agent to ensure that the reservoir has a certain gas-water seepage capacity during the production process, the fracturing method that is relatively unsuitable for the environment of muddy and silty reservoirs is adopted in the production mode. Fracturing of muddy silt type reservoirs cannot form fracture channels

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