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Exploitation method and system of seabed methane hydrate

A technology of methane hydrate and hydrate, which is applied in the direction of mining fluid, earthwork drilling, isolation devices, etc., can solve the problems of high cost, methane gas leakage, atmospheric greenhouse effect, etc., and achieve the maximum recovery rate, convenient maintenance, and operation reliable effect

Inactive Publication Date: 2013-10-02
李贤明
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Problems solved by technology

At present, there is no mature seabed methane hydrate mining method and system put into commercial operation in the world. The leakage of methane gas causes environmental pollution and the greenhouse effect of the atmosphere. It is still in the stage of laboratory exploration and cannot be put into commercial operation.

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  • Exploitation method and system of seabed methane hydrate

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Embodiment Construction

[0009] As shown in the figure is a specific embodiment of the seabed methane hydrate mining method and system of the present invention. Including: hot water (gas) input pipeline (1), booster water pump (2), combustion heating furnace (3), booster fan (4), water storage tank (5), diesel generator set (6), nitrogen Compression refrigerator (7), storage tank (8), gas compression separator (9), heat exchanger (10), drilling work platform (11), methane output pipeline (12), and water supply pump (13), Control Center (14).

[0010] During implementation, two vertical shafts can be drilled to reach the middle and lower part of the seabed methane hydrate reservoir through an offshore drilling platform, and the hot water (gas) input pipeline (1) and the methane output pipeline (12) are respectively placed in the vertical wells and Seal well with the inner wall of the shaft to prevent methane from leaking, and then blast two cavities at the bottom of the shaft at the same time with an ...

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Abstract

The invention provides an exploitation method and a system of seabed methane hydrate. The method comprises the steps that two silos which are different in depth and not far in distance are drilled by a drilling platform to a methane hydrate layer; two communicated cavities are formed by an explosive at the bottoms of the silos; high-temperature seawater is continuously injected into the bottom of the deeper silo, so that methane is converted into a gaseous state from a solid state; gaseous methane is ejected from the other silo, pressed, cooled, subjected to moisture removal, refrigerated by a nitrogen compressor to -162 DEG C to form liquid methane or made into methane hydrate again for storage; and a part of exploited methane serves as a fuel for heating the seawater. The method and the system have the benefits that methane hydrate stops decomposition as long as the high-temperature seawater is not injected; pipelines and container tanks have heat preservation measures, so that no heat energy is wasted; a diesel generator supplies power, so that the cost is low and the operation is reliable; the method belongs to a gap permeation displacement method and cannot cause seabed landslide; emissions are only carbon dioxide; and other wastes are wholly backfilled into a seabed, and are recycled.

Description

(1) Technical field [0001] The invention relates to a mining method and system for seabed methane hydrate (also known as "natural gas hydrate" and "combustible ice"), especially a method and system with simple structure, reliable operation, low cost, energy saving, environmental protection, safety, controllability and no pollutants. The method and system for exploiting discharged offshore oil and gas resources, and the technical field belongs to the field of exploiting ocean oil and gas resources. (2) Background technology [0002] Submarine methane hydrate is a crystal formed by the combination of methane gas and water molecules in a low-temperature and high-pressure environment. The main gas component produced after heating and decompression is high-purity methane. The methane molecule has only one carbon atom, and the emission of carbon dioxide after combustion is less. , and no sulfide is produced, it is an ideal clean energy. At present, there is no mature seabed metha...

Claims

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Application Information

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IPC IPC(8): E21B43/24E21B43/01E21B36/02
CPCE21B41/0099
Inventor 李贤明李乐水
Owner 李贤明
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