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Method and system for exploiting seabed natural gas hydrates

A natural gas and hydrate technology, which is applied in the fields of fluid extraction, mineral mining, and coal gasification, and can solve problems such as unsuccessful development of natural gas hydrate, toxic methanol, and complicated processes

Inactive Publication Date: 2005-11-02
INST OF PROCESS ENG CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Because this method uses methanol as an extractant, methanol is toxic and may cause toxicity to the environment and humans
The other is the use of CO 2 As heating agent and extractant, CO 2 to replace natural gas in gas hydrates, extract natural gas to shore, and separate CO 2 After recovering natural gas (such as JP2003063494), but due to the relatively complicated process of this method, the requirements for technology and equipment are relatively high, and many of the technical links still need to be improved
[0005] In summary, so far, there are no successful, commercial examples of gas hydrate development in the world

Method used

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  • Method and system for exploiting seabed natural gas hydrates

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Embodiment 1

[0044] refer to Figure 2a , make a subsea natural gas hydrate exploitation system, use the exploitation method mainly to generate electricity. The ground equipment composition of this embodiment: includes the construction of a conventional movable offshore natural gas hydrate exploitation platform 15, a gas-water separation tank 5 is installed on the platform, and the gas turbine 4 and the three-stage steam heater 3 are sequentially connected through pipelines; the three-stage The steam heater 3 includes a steam generator and a steam superheater, which has an exhaust gas outlet, and its lower part communicates with the gas turbine 4 through a pipeline; The machine 1 is connected through pipelines; the gas-water separation tank 5 is connected with a methane compressor 6, and the bottom of the gas-water separation tank 5 is connected with the centrifugal pump 7. The above-mentioned equipment is conventional equipment in this industry.

[0045] The seabed equipment of present e...

Embodiment 2

[0062] refer to Figure 3a , make a subsea natural gas hydrate exploitation system, use the exploitation method mainly for gas extraction in this system. The ground equipment composition of this embodiment: comprises utilizing an old mobile offshore natural gas hydrate exploitation platform 15, installs a generator 1, a gas turbine 4 on this platform, a three-stage engine that includes a steam generator and a steam superheater Section steam heater 3, a gas-water separation tank 5, a methane compressor 6 and a centrifugal pump 7; a gas-water separation tank 5, gas turbine 4 and three-stage steam heater 3 (shell) are installed on the platform process) through pipelines in sequence; the three-stage steam heater 3 has an exhaust gas outlet; the gas turbine 4 is connected with the generator 1 through pipelines; the gas-water separation tank 5 is connected with a methane compressor 6, and the bottom of the gas-water separation tank 5 is connected with Centrifugal pump 7 communicate...

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Abstract

The invention relates to the recovery method and system of submarine natural gas hydrates. The method comprises: building a recovery platform of submarine natural gas hydrates; adding heating medium into the submarine heat transfer via the heat-insulating pipe to heat and melt the submarine natural gas hydrates solid for the mixture of gas and liquid, which will be lifted to the platform and separated for natural gas; attained natural gas is used as fuel of the united recycle generating system for generation, while the left as natural gas hydrates is stored in the natural gas carrying lighter which operates the storage, transportation and distribution. The system comprises: offshore platform, gas-fueled turbine, steam turbine; three-section steam heater; submarine heat transfer; methane compressor; deep well pump; submarine swash bank; and underwater controlling the movement of platform. Said invention has simple apparatus and lower cost, which can reduce the energy consumption in exploiting submarine natural gas hydrates.

Description

technical field [0001] The invention relates to a method for exploiting natural gas hydrate, in particular to a method for exploiting seabed natural gas hydrate and an exploiting device. Background technique [0002] Natural gas hydrate is an ice-like crystal formed by methane-based hydrocarbon gas and water. Water molecules form cage polyhedrons through hydrogen bonds, and the cages contain natural gas molecules. Gas hydrates form and exist stably under specific high-pressure and low-temperature conditions, and mainly occur in the seabed and permafrost sediments at the continental margin. A large amount of this mineral has also been found in the South my country Sea. [0003] As a clean and high-quality energy in the future, natural gas hydrate has a wide distribution and a large scale of mineral deposits (the currently recognized global resources are 20,000 trillion m 3 Natural gas, the total amount of organic carbon is 2-3 times the total carbon amount of the existing e...

Claims

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Application Information

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IPC IPC(8): E21C50/00
CPCE21B2043/0115E21B41/0099
Inventor 许志宏丁丽颖温浩何险峰赵月红王卫华
Owner INST OF PROCESS ENG CHINESE ACAD OF SCI
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