Method and system for exploiting land combustible ice

Abstract

The invention provides a method and system for exploiting land combustible ice. Two vertical shafts with different depths and not far from each other are drilled to a combustible ice layer through a drilling machine. Two communicated cavities are formed in the bottoms of the vertical shafts through explosion of explosive, high-temperature fresh water is continuously injected into the bottom of the deeper vertical shaft, so that solid methane is converted into methane gas, the methane gas is ejected from the other vertical shaft, pressurization and cooling are conducted so that moisture can be removed, refrigeration is conducted on the methane gas through a nitrogen compressor until the temperature of the methane gas reaches minus 162 DEG C, so that methane liquid is obtained or the methane gas is converted into the combustible ice again for storage, and part of the exploited methane serves as fuel for heating the fresh water. The method and system for exploiting the land combustible ice have the advantages that as long as injection of the high-temperature fresh water stops, resolving of the combustible ice stops, and an insulation measure of a pipeline and a container is achieved, so that waste of heat energy is avoided; electric power is supplied by a diesel generator, so that manufacturing cost is low and operation is reliable; the method belongs to a gap permeation substitution method, and therefore underground collapse is avoided; only carbon dioxide is contained in the emission and all the other waste is backfilled underground for reuse.

Description

(1) Technical field [0001] The present invention relates to a method and system for exploiting terrestrial combustible ice (scientific name "natural gas hydrate"), especially a method for exploiting terrestrial oil and gas resources with simple structure, reliable operation, low cost, energy saving, environmental protection, safety, controllability and no pollutant discharge. and system. (2) Background technology [0002] Land combustible ice is a crystal formed by the combination of methane gas and water molecules in a low-temperature and high-pressure environment. It mainly exists in the permafrost of the land plateau. The main gas component produced after heating and decompression is very high-purity methane, and there is only one methane molecule. Carbon atoms emit less carbon dioxide after combustion, and no sulfide is produced, so it is an ideal clean energy source. At present, there is no mature method and system for mining combustible ice in land permafrost in the w...

AI Technical Summary

Problems solved by technology

At present, there is no mature method and system for mining combustible ice in land permafrost in the world that has been formally put into commercial operation. The reason is that the existing mining methods are relatively complicated, costly, and lack controllability and operability. It is easy to cause natural gas leakage, causing environmental pollution and atmospheric greenhouse effect. It is still in the stage of laboratory exploration and cannot be put into commercial operation.

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