Method for recovering sea bottom hydrate by single well heat injection circulation

A technology for hydrate and hydrate decomposition, 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: 2007-04-11
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 recovering sea bottom hydrate by single well heat injection 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. Packer 2. Tubing 3. Casing 4. Suction pump 5. Gas-liquid separator

[0021] 6. Natural gas output pipeline 7. Sewage treatment and heating device 8. Water injection booster pump

[0022] 9. Gravel packing 10. Horizontal section tubing 11. Slotted liner

[0023] As shown in Figure 1, firstly, the water injection well is drilled through the hydrate layer by using deep-water drilling technology, and then a horizontal well section is drilled on the top of the hydrate layer, and sand control is carried out by using gravel packing and sand control screens.

[0024] Casing 3 is cemented, the horizontal well section is completed with open hole and gravel packed. After the platform heats the circulating medium, it is pumped into the oil pipe 2 by the high-pressure pump 8 and enters the f...

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Abstract

The single well operation process for exploiting hydrate from sea bottom includes the following steps: drilling one horizontal section in the top of hydrate layer to expand the hydrate layer exposing area; connecting slotted pipe to the end of the horizontal section to increase the passage area of the recirculated medium; forming one circulation with the oil pipe and the annular space and with water as the circulating medium; injecting hot water into oil pipe from the platform and returning hot water to the vertical section to exchange energy with stratum and to decompose the hydrate; backing upwards the mixed liquid through the annular space; adopting sand preventer in the horizontal section to leave sand in the storing layer; and treating the exploited water and reinjetting to underground for reuse and separating from sea water to avoid environmental pollution.

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): E21B43/01E21C50/00
CPCE21B2043/0115E21B41/0099
Inventor 王瑞和任韶然张卫东刘永军
Owner CHINA UNIV OF PETROLEUM (EAST CHINA)
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