Safe mining method for natural gas hydrate

Abstract

The invention discloses a safe mining method for natural gas hydrate. According to the technical scheme, the safe mining method for the natural gas hydrate comprises the following steps that geological survey is conducted on a pre-development block; a pre-development block well position is deployed; well track optimization is carried out; a first batch of wells are drilled at intervals and depressurization production is performed; the wells are abandoned after production, and cement is injected into the bottoms of the wells to fill cavities; a second batch of wells are drilled between the first batch of wells and depressurization mining is performed; and production is finished. According to geological characteristics of a seabed slope and distribution characteristics of a natural gas hydrate reservoir, the plastic zone penetration phenomenon of the seabed slope is effectively prevented by optimizing well position deployment, drilling well production in batches and filling mining cavities, and engineering disasters such as blowout, seabed landslide and methane leakage, geological disasters and environmental problems are avoided; and stable exploitation of the natural gas hydrate reservoir under the seabed slope is ensured.

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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