Device and method for continuously injecting hot seawater to exploit seabed natural gas hydrate

Abstract

The invention provides a device for continuously injecting hot seawater to exploit seabed natural gas hydrate. The device comprises: a plurality of downwater pipes (1), the inlet end of which is arranged near the sea level, and the position of the inlet end is higher than the sea level; a plurality of heat dissipation pipes (1). 3), distributed in the seabed hydrate layer (6) in the form of a spider web or hexagonal network or branch or ring structure; at least one outlet pipe (2), the outlet end is set near the sea level, and the outlet pipe (2) The outlet end of the outlet pipe is equal to or lower than the inlet end of the downwater pipe (1); the plurality of downwater pipes (1), the plurality of cooling pipes (3) and at least one outlet pipe (2) are connected in sequence to form a connector. Making full use of the static pressure transmission principle of the connector, the high-temperature seawater on the surface of the sea surface is continuously passed through the cooling pipe laid in the hydrate layer on the seabed only by a common type of low-power centrifugal pump. The heat dissipation pipes of the present invention are arranged in a mesh structure, which can improve heat dissipation efficiency, expand heat dissipation area, and improve mining efficiency.

Description

technical field [0001] The invention relates to the field of natural gas hydrate exploitation, in particular to a device and method for continuously injecting hot seawater to exploit seabed natural gas hydrate. Background technique [0002] With the development of my country's economy, the demand for energy continues to grow, so it is urgent to develop new energy to meet the needs of my country's rapid economic development. Gas hydrates are ice-like, non-stoichiometric, clathrate crystalline compounds formed under certain conditions when water and natural gas are mixed at high pressure and low temperature. Gas hydrate reserves on the earth are very rich, about 27% of the land (mostly distributed in the permafrost) and 90% of the sea have gas hydrate. Under standard conditions, 1 unit volume of hydrate decomposition can produce up to 164 unit volumes of methane gas, and its energy density is 10 times that of coal. It has the characteristics of convenient use, high combustion...

AI Technical Summary

Problems solved by technology

If a large amount of hydrate reservoirs are to be exploited, huge external heat energy is required, which greatly reduces the economic benefits of exploitation, and even the losses outweigh the gains

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