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Device and method for efficiently exploiting natural gas hydrate by adopting flue gas of power plant

A technology for hydrates and natural gas, which is applied in the fields of mining fluids, separation methods, chemical instruments and methods, etc., can solve the problems of low methane concentration, poor economy, and low energy efficiency in the produced gas, and achieve low energy consumption and high recovery rate Effect

Inactive Publication Date: 2016-09-28
SOUTH CHINA UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] Aiming at the disadvantages of low methane concentration in the output gas, low energy efficiency and poor economy in the mining process when flue gas is exploited for hydrates, the present invention proposes a method for efficiently exploiting natural gas hydrates from flue gas in power plants

Method used

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  • Device and method for efficiently exploiting natural gas hydrate by adopting flue gas of power plant
  • Device and method for efficiently exploiting natural gas hydrate by adopting flue gas of power plant
  • Device and method for efficiently exploiting natural gas hydrate by adopting flue gas of power plant

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Embodiment 1

[0034] This embodiment provides a method for efficiently exploiting natural gas hydrate reservoirs with reservoir conditions of 4°C and 12MPa by flue gas from a power plant. The operation process is as follows:

[0035] Firstly, one horizontal well is drilled in the middle and the edge of the hydrate reservoir, and the decompression mining method is used for mining. When the hydrate reservoir pressure drops to 4.3MPa, inject 8MPa flue gas (volume fraction 0.16CO 2 +0.84N 2 ). The flue gas injected into the formation reacts with the hydrate in the hydrate reservoir to obtain a mixed gas containing methane, which is directly transported to the turbo expander to recover part of the pressure energy through the production well and pipeline, and the pressure of the mixed gas is reduced to 2MPa and transported to the membrane The first-stage hollow fiber membrane module of the separation device. The permeate gas of the first-stage hollow fiber membrane module enters the second-sta...

Embodiment 2

[0037] This embodiment provides a method for efficiently exploiting natural gas hydrate reservoirs with a reservoir condition of 1°C and 12MPa by flue gas from a power plant. The operation process is as follows:

[0038] Firstly, one horizontal well is drilled in the middle and the edge of the hydrate reservoir, and the decompression mining method is used for mining. When the hydrate reservoir pressure drops to 3.3MPa, inject 7MPa flue gas (volume fraction 0.16CO 2 +0.84N 2 ). The flue gas injected into the formation reacts with the hydrate in the hydrate reservoir to obtain a mixed gas containing methane, which is directly transported to the turbo expander to recover part of the pressure energy through the production well and pipeline, and the pressure of the mixed gas is reduced to 2MPa and transported to the membrane The first-stage hollow fiber membrane module of the separation device. The permeate gas of the first-stage hollow fiber membrane module enters the second-st...

Embodiment 3

[0040] This embodiment provides a method for efficiently exploiting natural gas hydrate reservoirs with a reservoir condition of 1°C and 10MPa by flue gas from a power plant. The operation process is as follows:

[0041] Firstly, one horizontal well is drilled in the middle and the edge of the hydrate reservoir, and the decompression mining method is used for mining. When the hydrate reservoir pressure drops to 3.3MPa, inject 6MPa flue gas (volume fraction 0.16CO 2 +0.84N 2 ). The flue gas injected into the formation reacts with the hydrate in the hydrate reservoir to obtain a mixed gas containing methane, which is directly transported to the turbo expander to recover part of the pressure energy through the production well and pipeline, and the pressure of the mixed gas is reduced to 2MPa and transported to the membrane The first-stage hollow fiber membrane module of the separation device. The permeate gas of the first-stage hollow fiber membrane module enters the second-st...

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Abstract

The invention discloses a device for efficiently exploiting natural gas hydrate by adopting flue gas of a power plant. The device comprises a gas booster, an injection well, an overlying formation, an exploiting well, a turbine expansion device, a membrane separation device and a decarburization device, wherein the gas booster is connected with the injection well; the exploiting well is connected with the turbine expansion device, the membrane separation device and the decarburization device sequentially. With the adoption of the method for exploiting the hydrate, the recovery rate of methane is higher; the exploiting mode is more environment-friendly, and CO2 is sealed and stored while methane hydrate is exploited; energy consumption is lower.

Description

technical field [0001] The invention relates to the field of natural gas hydrate exploitation, in particular to a method for efficiently and economically exploiting natural gas hydrate from power plant flue gas. Background technique [0002] Gas hydrate widely exists in terrestrial permafrost regions and seabed sediment layers, and is a promising next-generation energy resource. How to efficiently and economically exploit huge natural gas resources from hydrate reservoirs still faces many challenges. [0003] At present, the technology of exploiting natural gas hydrate offshore is generally derived from the conventional oil and gas exploitation technology in the oil and gas industry. These methods all take advantage of differences in driving forces in temperature, pressure, and chemical potential to significantly alter conditions in hydrate reservoir zones. The thermal shock method is to cause the hydrate reservoir temperature to change between formation and decomposition ...

Claims

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Application Information

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IPC IPC(8): E21B43/30E21B43/24E21B43/295E21B43/01C10L3/10B01D53/22B01D53/02
CPCB01D53/02B01D53/22B01D2256/245B01D2257/102B01D2257/50C10L3/105E21B41/0099E21B43/01E21B43/168E21B43/24E21B43/295E21B43/305
Inventor 樊栓狮王曦郎雪梅王燕鸿
Owner SOUTH CHINA UNIV OF TECH
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