Method for dumping and disposing of carbon dioxide gas and apparatus therefor

An apparatus for gathering natural gas by using carbon dioxide gas as a heat generating source, comprising:

• an injection pipe for injecting carbon dioxide, said pipe having an outlet operable to be disposed in or below layers of hydrate of natural gas;
• a pressure injection apparatus for injecting carbon dioxide under pressure through said injection pipe and out of said outlet;
• a gathering pipe for gathering a mixed gas containing natural gas separated from the layers of hydrate of natural gas and carbon dioxide;
• and
• a gas separator for separating natural gas from the gathered mixed gas.

A method for dumping carbon dioxide gas into ground of sea bottom comprising the steps of:

• boring a well in the ground of the sea bottom;
• setting a carbon dioxide injecting pipe in said well;
• and
• injecting the carbon dioxide gas into the ground of the sea bottom deeper than a depth where the carbon dioxide gas contacts sea water penetrated into the ground and is converted to a gas hydrate of carbon dioxide to fix the carbon dioxide gas, the carbon dioxide gas being blocked by the gas hydrate formed above the carbon dioxide gas thereby being restrained to reside in the ground of the sea bottom.

A method for gathering natural gas by using dumped carbon dioxide gas as a heat generating source, comprising the steps of:

• injecting one selected from the group consisting of the carbon dioxide gas and liquefied carbon dioxide gas into layers of hydrate of natural gas existing in the ground of the sea bottom;
• and
• dissociating the natural gas from the layers of the hydrate of the natural gas by sensible heat of the carbon dioxide and latent heat, the latent heat being produced when the carbon dioxide gas is converted to a gas hydrate of carbon dioxide;
• and
• pumping up the dissociated natural gas to sea surface

A method for gathering natural gas by using dumped carbon dioxide gas as a heat generating source comprising the steps of:

• injecting one selected from the group consisting of the carbon dioxide gas or liquefied carbon dioxide gas, into layers of hydrate of natural gas existing in permafrost region of a cold district;
• and
• dissociating the natural gas from the layers of the hydrate of the natural gas by sensible heat of the carbon dioxide and latent heat, the latent heat being produced when the carbon dioxide gas is converted to a gas hydrate of the carbon dioxide;
• and
• pumping up the dissociated natural gas to ground surface.