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Method for extracting natural gas hydrates through directional drilling and depressurization

A directional drilling and hydrate technology, applied in directional drilling, drilling equipment and methods, earth-moving drilling, etc., can solve the problems of limited mining area, blocking mining wells, restricting the mining range, etc., so as to increase the mining area. , to avoid blockage, reduce the effect of damage

Inactive Publication Date: 2018-02-16
CHINA UNIV OF MINING & TECH
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Problems solved by technology

On the one hand, this method needs to select a suitable natural gas hydrate formation, and the production area is limited; on the other hand, the layout of the production well limits the production range, and it is easy to cause problems such as sand production to block the production well.

Method used

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  • Method for extracting natural gas hydrates through directional drilling and depressurization
  • Method for extracting natural gas hydrates through directional drilling and depressurization
  • Method for extracting natural gas hydrates through directional drilling and depressurization

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Embodiment 1

[0024] Embodiment 1: as Figure 1-4 As shown, this embodiment provides a method for directional drilling to reduce pressure and exploit natural gas hydrate, which specifically includes the following steps:

[0025] a. Construct a natural gas hydrate offshore exploitation platform 1 at sea level, on which there are drainage equipment 20, mixture separation equipment 21, control platform 24, marine geophysical detection device 23, etc., from the exploitation platform through the seawater layer 2 to The production well 8 is arranged on the seabed. The diameter of the production well 8 is 10m to ensure the working space of the directional drilling machine 16 and auxiliary equipment.

[0026] b. Lower the directional drilling rig 16 and auxiliary equipment to the bottom of the production well 8, and arrange the mud pump 18 and the drilling monitor 19 on the offshore mining platform 1, and use the directional drilling rig 16 to drill holes inclined to the seabed formation, and ensur...

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Abstract

The invention discloses a method for extracting natural gas hydrates through directional drilling. The method comprises the steps that directional drilling is conducted on a natural gas hydrate layerby arranging a drilling field on the sea bed, and after an existing condition of the hydrate layer is broken, extraction equipment is adopted to extract discomposed hydrates to an offshore productionplatform to be processed. The method is simple and reliable in technical operation, and can adapt to geological conditions of different hydrate layers, the hydrate production area is enlarged, the yield and the recovery rate are improved, and the method has good application prospects.

Description

technical field [0001] The invention relates to the technical field of exploiting seabed natural gas hydrates, in particular to a method for directional drilling to reduce pressure and extract natural gas hydrates. Background technique [0002] Natural gas hydrate resources mainly exist in trench-basin systems, continental slope systems, and marginal sea basins and continental margins worldwide. So far, more than 230 natural gas hydrate producing areas have been found in the world, and the hydrate content is about 2.1×10 16 m 3 , which contains twice as much total organic carbon (TOC) as coal, oil, and natural gas combined. Therefore, in the context of the depletion of conventional oil and gas resources in the world, the exploitation and utilization of gas hydrates are more urgent. [0003] The current natural gas hydrate mining mainly includes heat injection mining, depressurization mining, chemical injection mining, displacement mining and solid mining, among which depre...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): E21B43/01E21B43/34E21B7/04E21B43/08
CPCE21B7/043E21B41/0099E21B43/01E21B43/086E21B43/34
Inventor 王方田赵宾李岗
Owner CHINA UNIV OF MINING & TECH
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