Patent ID: 8397829
Filing Date: 2013-03-19
Classification: A62C,E21F

Abstract:
1. A method for controlling subterranean coal fires, comprising: a. determining a subterranean volume containing said subterranean coal fire; b. determining a location for a combustion face within said subterranean coal fire; c. determining a location for each ventilation access port providing access to said subterranean coal fire; d. adding a flow control device to each ventilation access port; e. providing a source of gaseous carbon dioxide; f. providing a source of liquid carbon dioxide; g. injecting said gaseous carbon dioxide into said subterranean volume; h. monitoring at least one flow control device and regulating said at least one flow control device in order to maintain a pressure within said subterranean volume which is greater than atmospheric pressure; and i. injecting said liquid carbon dioxide into said subterranean volume immediately adjacent to said combustion face.