Marine natural gas hydrate exploitation method combined to pressure-reduced water flow erosion method

Abstract

The invention belongs to the technical field of marine natural gas hydrate exploitation and seawater desalination, and relates to a marine natural gas hydrate exploitation method combined to a pressure-reduced water flow erosion method. Based on influences of water flowing to stable existing of hydrate, a marine natural gas hydrate exploitation method combined to the pressure-reduced water flow erosion method is provided by decomposition of the hydrate due to chemical potential difference between a hydrate phase and an environment water phase in a water flowing process and influences of the water flowing speed to hydrate decomposition speed and through a pressure-reduced exploitation method. By the method, preliminary partial decomposition of the hydrate of a reservoir is implemented by pressure-reduced exploitation at first, the permeability of a peripheral region of the reservoir is improved, decomposition gas controls pressure difference of the reservoir to implement continuous water flowing in a hydrate exploitation process, and step-by-step stable and efficient decomposition of the hydrate is realized by control over the water flowing speed. The method is easy to implement, and large-scale commercial exploitation of the hydrate is realized favorably.

Description

technical field [0001] The invention belongs to the technical field of marine natural gas hydrate exploitation, and in particular relates to a marine natural gas hydrate exploitation technology combined with pressure-reducing water flow erosion method. Background technique [0002] With the increasing consumption of traditional fossil fuels and the sharp decrease in reserves, the search for an efficient, clean and sustainable new energy source has attracted worldwide attention. Among them, natural gas hydrate, as a new, efficient and environment-friendly energy source, has been considered as the most promising energy source in the world. How to achieve efficient and safe commercial exploitation of natural gas hydrate is of great significance for changing the current world energy consumption structure. At present, hydrate mining methods mainly include depressurization method, thermal shock method, inhibitor method, carbon dioxide replacement method and other methods, but the...

AI Technical Summary

Problems solved by technology

The water erosion method effectively solves the problems existing in other mining methods, including formation icing and secondary hydrate formation, resulting in low mining efficiency and safety problems caused by geological instability of the reservoir.

However, the difficulty of water erosion hydrate mining technology lies in how to realize the flow of water

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