Patent ID: 8839875
Filing Date: 2014-09-23
Classification: E21B,F23J,Y02P

Abstract:
1. A method of sequestering carbon dioxide and recovering natural gas from a coal or gas shale reservoir or formation, comprising: capturing or producing carbon dioxide gas from coal or from flue gases of a power plant, incinerator or chemical processing plant; injecting liquid nitrogen into an injection pipe to reduce the temperature thereof to minus 60 degree F. or less and using a thermocouple to measure the temperature of said injection pipe at a predetermined depth; pressurizing and cooling the carbon dioxide gas to create pressurized cold liquid carbon dioxide with no proppants or toxic additives added therein; injecting the pressurized cold liquid carbon dioxide through an underground transfer line connected to said injection pipe and extending said injection pipe into said reservoir or formation, wherein said injection pipe has perforations that allow the carbon dioxide to be released into said reservoir or formation; releasing the pressurized cold liquid carbon dioxide through said perforations and into said coal or shale and creating fractures therein; allowing the liquid carbon dioxide to adsorb onto the coal or shale and allowing natural gas to be desorbed and released from the coal or shale; and allowing the natural gas released from the coal or shale to pass through the fractures and toward said injection pipe or an additional recovery pipe, and allowing the natural gas to rise to the surface through said pipe or pipes.