Combustible ice mining method

A mining method and gas extraction technology, which is applied in the field of combustible ice mining, can solve the problems of poor permeability of sediment layers, low mining efficiency, and slow replacement rate, so as to improve the restoration effect, avoid geological collapse, and improve restoration efficiency

Active Publication Date: 2020-04-17
深圳市弘毅海洋智能装备有限公司
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Problems solved by technology

At present, this method has been proved to be feasible in terms of thermodynamics and kinetics, but the replacement rate of carbon dioxi...

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[0030] In order to make the object, technical solution and advantages of the present invention clearer, the present invention will be further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described here are only used to explain the present invention, not to limit the present invention.

[0031] It should also be noted that the orientation terms such as left, right, up and down in the embodiments of the present invention are only relative concepts or refer to the normal use state of the product, and should not be regarded as restrictive .

[0032] Please refer to Figure 1 to Figure 3 , The invention provides a combustible ice mining method, comprising the following steps: block division, pipeline laying, mining operation and repair operation.

[0033] Block division: explore the geological conditions and define the mining range according to the geological conditions, and divide t...

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Abstract

The invention is applicable to the technical field of combustible ice mining, and provides a combustible ice mining method which comprises the following steps: dividing blocks, exploring geological conditions, defining a mining range and dividing the mining range into a plurality of operation areas, wherein each operation area ensures that collapse does not occur in the mining process; pipeline laying: a gas production pipeline, a gas transmission pipeline, gas production branch pipes and a gas transmission main pipe are laid in the operation area, and the gas production branch pipes and the gas transmission branch pipes are arranged at intervals; mining operation: the combustible ice is decomposed in a pressure reducing and/or temperature increasing mode, and decomposed methane gas is conveyed to a storage device; repairing operation: injecting carbon dioxide into the operation area at high pressure by a gas transmission device and diffusing the carbon dioxide in the operation area togenerate carbon dioxide hydrate; and circulating operation: mining operation and repairing operation of all the operation areas are completed in sequence. According to the combustible ice mining method, the combustible ice mining efficiency is improved, and efficient carbon sequestration is realized to repair a geological layer.

Description

technical field [0001] The invention belongs to the technical field of combustible ice mining, in particular to a method for mining combustible ice. Background technique [0002] Natural gas hydrate (NGH) is also known as combustible ice. In my country, combustible ice mainly exists in the seabed sediments of the South China Sea. At present, only the depressurization method for combustible ice mining has obtained a certain degree of industrial verification. The molecular structure of combustible ice changes during mining, from solid to gas, which changes the mechanical properties of seabed sediments, resulting in weak areas in the bottom layer due to excessive weight loads, which in turn triggers large-scale hydrate landslides and eventually drives The flow or collapse of the rock layer will then cause geological disasters, such as sea level rise or tsunami, so safety is one of the important issues to be faced in the commercial exploitation of hydrates. [0003] Carbon di...

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Application Information

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IPC IPC(8): E21B43/01E21B43/16
CPCE21B43/01E21B43/164Y02P90/70
Inventor 陈道毅
Owner 深圳市弘毅海洋智能装备有限公司
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