A safe mining method of natural gas hydrate

Abstract

The invention discloses a method for safe exploitation of natural gas hydrate, and its technical scheme includes the following steps: geological survey of pre-development block; deployment of well positions in pre-development block; optimization of well trajectory; interval drilling of the first batch of wells and descending After the end of production, the well is abandoned, and cement is injected into the bottom of the well to fill the cavity; the second batch of wells is drilled between the first batch of wells and the depressurization is carried out; the production ends. According to the geological characteristics of the submarine slope and the distribution characteristics of natural gas hydrate reservoirs, by optimizing the deployment of well locations, drilling production in batches and filling the mining cavities, the phenomenon of plastic zone penetration in the submarine slope can be effectively prevented, and blowouts, submarine landslides, methane leakage, etc. can be avoided. Engineering disasters, geological disasters and environmental problems, to ensure the stable exploitation of gas hydrate reservoirs under submarine slopes.

Description

technical field [0001] The invention relates to the technical field of natural gas hydrate exploitation, in particular to a safe exploitation method of natural gas hydrate. Background technique [0002] Natural gas hydrate, commonly known as combustible ice, is a clathrate compound formed by natural gas and water molecules under low temperature and high pressure environment. China is the world's largest energy consumer. In recent years, my country's dependence on energy imports has been increasing. Therefore, it is urgent to find a new energy source to replace traditional fossil energy sources. Natural gas hydrate is recognized as the most promising alternative energy due to its large resource reserves, high energy density and low pollution. It is of great significance to ensure the safe supply of energy, promote the construction of ecological civilization, and maintain sustainable economic and social development. [0003] Gas hydrates are mainly distributed in marine sedi...

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Problems solved by technology

The above problems are the difficulties and dangers faced in the exploration and production of natural gas hydrate reservoirs in seabed slopes. Through the search of domestic and foreign existing technical patent documents, it is found that there is no patent related to drilling and completion technology that completely solves this problem.

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