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Low BTU gas from a thick coal seam of moderate depth (30 ft. Results show that the seam depth/thickness ratio is the most important variable affecting the economics of UCG. Only-dirty gas selling prices are calculated in order to avoid assumptions concerning unproven methods of gas cleanup.
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A total of 1,296 cases have been considered in order to cover a full range of all sensitivity variables. Depth and thickness of the coal seam are also designated sensitivity variables because they are strictly site-specific. Other sensitivity variables are percent gas loss, well spacing, and the volumetric combustion sweep efficiency (VCSE).
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Such variables are designated sensitivity variables and are over their entire probable range. Independent variables cannot be fixed with certainty - for example, gas heating values are known for short-term field tests but remain uncertain for a long-term commercial operation. This paper provides the results of an economic analysis in which uncertainty has been minimized through the use of the following three types of information: (1) theoretical and experimental correlations of underground coal gasification (UCG) operating parameters (2) detailed process design based on operational experience and (3) sensitivity variables.