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Method and device for sea natural gas hydrate production and drilling

A drilling device and hydrate technology, which is applied in the direction of fluid mining, mineral mining, earth drilling and mining, etc., to achieve the effect of simple equipment, convenient operation and high-efficiency mining

Inactive Publication Date: 2005-03-02
GUANGZHOU INST OF ENERGY CONVERSION - CHINESE ACAD OF SCI
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  • Description
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Problems solved by technology

There are centralizers between the three layers of fluid circulation channels for positioning

Method used

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  • Method and device for sea natural gas hydrate production and drilling
  • Method and device for sea natural gas hydrate production and drilling
  • Method and device for sea natural gas hydrate production and drilling

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Embodiment Construction

[0023] Below in conjunction with accompanying drawing, content of the present invention will be further described:

[0024] like figure 1 As shown, the drilling device of the present invention includes a drill bit 1, which includes three layers of fluid circulation channels after the drill bit is connected. Among them, the first layer is the hollow drill pipe 2, which is used to generate high-speed jet 6; the second layer is the annular space between the drill pipe 2 and the casing 3, which is used to introduce seawater 7; the third layer is the casing 3 and the formation wellbore The annulus between the 4 well walls is used to export the mixture 8 of hydrate, mud sand and water. There are centralizers 5 for positioning between the three layers of fluid circulation channels.

[0025] When the drilling device of the present invention is in operation, the jet 6 is generated by the nozzle installed on the drilling device, and the liquid of the jet flow can be a mixture of seawa...

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Abstract

The invention relates to a kind of new-type marine natural gas hydrate drilling device and method which uses methods including drilling device of three layers fluid circulation passway to mine the hydrate layers. Among them, the first layer is the drilling rod of is hollow in order to produce high-speed efflux, the second is the annular space between drilling rod and sleeve pipe in order to channel into the sea water, the third layer is the annular space between sleeve pipe and stratum well eyes and borehole wall in order to channel out the mixture of hydrate, silt and water. The drilling device and method needs simple equipment, operates easily, can realize the high-efficient exploitation, and solved the problem of the existing technique that lacks of proper drilling device and method for the natural gas hydrate.

Description

technical field [0001] The invention relates to a drilling method and device for exploiting marine natural gas hydrate. Background technique [0002] Natural gas hydrate is a high-quality and clean energy in the future. Its reserves are equivalent to the total carbon of the existing earth's fossil fuels (oil, natural gas and coal), and it will become the most important energy for human beings in the 21st century. Combining the natural gas hydrate mining technologies proposed by scientists from various countries, both underground decomposition mining and above-ground decomposition mining require rock-breaking drilling in the formation, so natural gas hydrate mining drilling technology is an important subject that needs to be studied. [0003] Compared with the drilling practice of conventional oil / gas wells drilling more than 60,000 wells a year, the drilling practice of gas hydrate formation is almost equal to zero. The differences between traditional offshore oil / gas wells...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): E21C50/00
CPCE21B2043/0115E21B41/0099
Inventor 冯自平郝永卯黄冲肖睿
Owner GUANGZHOU INST OF ENERGY CONVERSION - CHINESE ACAD OF SCI
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