Process to sequester CO2 in natural gas hydrate fields and simultaneously recover methane

a natural gas hydrate and co2 technology, applied in the field of process for storage and sequestration of carbon dioxide (co2), can solve the problems of environmental damage to the host and method has not yet been successfully demonstrated

Inactive Publication Date: 2005-06-09
GAS TECH INST
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

These increased emissions of greenhouse gases are believed responsible for a one degree Fahrenheit increase in the global average temperature over the past several years and if nothing is done to reduce them, the Earth will continue to warm, resulting in a host of environmentally damaging consequences, according to some scientists.
It is believed, however, that such a method has not yet been successfully demonstrated.

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  • Process to sequester CO2 in natural gas hydrate fields and simultaneously recover methane
  • Process to sequester CO2 in natural gas hydrate fields and simultaneously recover methane
  • Process to sequester CO2 in natural gas hydrate fields and simultaneously recover methane

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Embodiment Construction

[0020] The invention claimed herein is a method for sequestration and storage of CO2 in which the CO2 to be sequestered and stored is injected into a subterranean methane hydrate field whereby the methane in the methane hydrate field is displaced by the CO2 and, in so doing, the methane is released for collection.

[0021] Both CO2 and methane form structure I hydrates. At temperatures below about 283° K, there is a pressure range in which methane hydrate is unstable and CO2 hydrate is stable. The heat released from the formation of CO2 gas hydrate is larger than that needed for methane hydrate dissociation:

CH4(H2O)n→CH4+nH2O Δhf=54.49 KJ / mole

CO2(H2O)n→CO2+nH2O Δhf=57.98 KJ / mole

where n is the hydration number for methane hydrate and CO2 hydrate (assuming that n is 6.15 for both methane and CO2). It should be noted that n is dependent on pressure, temperature and the composition of the gas in the gas phase. This suggests that under certain pressure-temperature conditions, the repla...

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Abstract

A method for sequestering and storing CO2 in which gaseous carbon dioxide is injected into a subterranean methane hydrate field, displacing methane in the methane hydrate field with the carbon dioxide and forming carbon dioxide hydrate. The displaced methane may then be collected.

Description

BACKGROUND OF THE INVENTION [0001] 1. Field of the Invention [0002] This invention relates to a process for storage and sequestration of carbon dioxide (CO2). More particularly, this invention relates to a process for underground storage and sequestration of carbon dioxide in submerged sea areas of natural gas hydrate deposits. [0003] 2. Description of Related Art [0004] Levels of anthroprogenic greenhouse gases, including carbon dioxide, in the Earth's atmosphere have been increasing substantially over the years due primarily to the burning of fossil fuels to supply about 80 percent of the world's energy needs. These increased emissions of greenhouse gases are believed responsible for a one degree Fahrenheit increase in the global average temperature over the past several years and if nothing is done to reduce them, the Earth will continue to warm, resulting in a host of environmentally damaging consequences, according to some scientists. There exists a range of options available f...

Claims

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Application Information

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Patent Type & Authority Applications(United States)
IPC IPC(8): B01D53/14E21B41/00E21B43/16
CPCB01D53/1475C01B31/20E21B41/0064Y02C10/14E21B2043/0115Y02C10/06E21B43/164Y02P90/70C01B32/50E21B41/0099Y02C20/40Y02P20/151
Inventor SIVARAMAN, ALWARAPPA
Owner GAS TECH INST
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