Thermal activation type production device for production of natural gas hydrates in ocean sediments

Abstract

The invention discloses a thermal activation type production device for production of natural gas hydrates in ocean sediments. The thermal activation type production device comprises a drilling platform and a vertical drilling hole, wherein the bottom part of the vertical drilling hole extends into a natural gas hydrate area; the part, extending into the natural gas hydrate, of the vertical drilling hole is provided with at least one horizontal section hole cavity; an air intake pipeline, a waste gas exhaust pipeline and a natural gas collecting pipeline are arranged in the vertical drilling hole; a plurality of natural gas collecting holes are formed in the natural gas collecting pipeline and are used for natural gas to enter; a combustion chamber is arranged in each horizontal section hole cavity; a spark plug, a temperature sensor and a pressure sensor are arranged in the combustion chamber, and the spark plug is used for igniting internal gas; an air intake pipe of the combustion chamber is communicated with an air intake pipeline, and a waste gas output pipe of the combustion chamber is communicated with a waste gas exhaust pipeline. The thermal activation type production device has the advantage that by controlling quantitative combusting in the combustion chamber, and circulating air exhaust, air intake, combustion and the like, the natural gas hydrate area can be stably heated, and finally the natural gas is collected.

Description

technical field [0001] The invention relates to the technical field of natural gas hydrate exploitation in marine sediments, in particular to a thermal activation method exploitation device for natural gas hydrate exploitation in marine sediments. Background technique [0002] Most gas hydrate collection methods adopt thermal excitation method; [0003] The thermal excitation method is to break the stable existence conditions of hydrates by increasing the temperature of the hydrate layer, and use various heating methods to heat the hydrate reservoir, so that the temperature of the hydrate layer is higher than the equilibrium temperature, so that the hydrates can be decomposed. [0004] The currently used collection technology is to pump hot water or high-temperature steam into the natural gas hydrate. This first requires the formation of hot water and steam, resulting in primary energy consumption. In addition, this form of injected heat will cause a large amount of heat los...

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Problems solved by technology

[0004] The currently used collection technology is to pump hot water or high-temperature steam into the natural gas hydrate. This first requires the formation of hot water and steam, resulting in primary energy consumption. In addition, this form of injected heat will cause a large amount of heat loss during transportation. At the same time, this form of heat source is not hot enough, and the thermal efficiency is low

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