Method for extracting hydrate on bottom of sea by deep earth heart water circulation

A technology of hydrate and geothermal water, which is applied in the fields of mining minerals, mining fluids, and earth-moving drilling, etc., to achieve the effect of convenient operation and simple equipment.

Inactive Publication Date: 2006-06-14
CHINA UNIV OF PETROLEUM (EAST CHINA)
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  • Abstract
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Problems solved by technology

So far, there is no specific and efficient method that can be used to recover gas hydrates

Method used

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  • Method for extracting hydrate on bottom of sea by deep earth heart water circulation

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Embodiment Construction

[0018] The present invention will be further described below in conjunction with accompanying drawing:

[0019] The device adopted in the present invention comprises the following parts:

[0020] 1. Downhole pump 2. Packer 3. Lower packer 4. Water injection distributor 5. Upper packer

[0021] 6. Casing 7. Water injection pipe 8. Filling gravel 9. Sand control screen 10. Gas production pipe

[0022] 11. Suction pump 12. Gas-water separator 13. Natural gas output pipeline

[0023] 14. Sewage reinjection booster pump 15. Sewage reinjection pipe 16. Upper packer 17. Lower packer

[0024] as attached figure 1 As shown, firstly, the water injection well is drilled through the hydrate layer by deep-water drilling technology, and then continues to extend to the deep geothermal water layer with a water temperature above 40°C; The same reservoir as the geothermal water is used to realize sewage reinjection, and a horizontal well is drilled in the middle of the hydrate layer through...

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Abstract

The invention offers a method of exploiting seabed hydrate. It includes the following steps: using at least two well arrays to form a injecting exploiting well array; using horizontal or deflected section to connect with water injection well and gas production well at hydrate layer; transferring carried heat quantity to hydrate to make it decompose; exploiting the decomposed natural gas; separating gas and water; injecting the separated water to deep part geothermal water layer. The invention combines heating and decompression. The invention has the advantages of simple equipment, convenient operation, and environmental protection. It can apply in large scale exploiting seabed hydrate.

Description

technical field [0001] The invention relates to a natural gas hydrate mining method. Background technique [0002] With the huge consumption of oil and gas resources, mankind will face a huge crisis of oil and gas resources in the late 21st century. In particular, China, as a big energy consumer, imports more than 100 million tons of crude oil annually. The output of domestic onshore oil and gas fields is barely stable, and experts estimate that it will be difficult to make major breakthroughs in the short term. As an alternative energy source, natural gas hydrate is being favored by scientists all over the world. [0003] Natural gas hydrate is an ice-like solid crystal composed of natural gas and water molecules. Natural gas is mainly composed of methane, so it is also called methane hydrate. Because it contains a large amount of methane gas, it has extremely strong combustion power and can be burned directly, so it is also commonly known as "combustible ice". The ener...

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): E21C50/00
CPCE21B41/0099
Inventor 任韶然王瑞和张卫东刘永军
Owner CHINA UNIV OF PETROLEUM (EAST CHINA)
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