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• W2022659296 abstract "Brandenburg, Charles F., Laramie Energy Research Center, U.S. ERDA, Reed, Ray P., Sandia Laboratories, Albuquerque, Boyd, Michael R., Laramie Energy Research Center, U.S. ERDA, Northrop, David A., Sandia Laboratories, Albuquerque and Jennings, James W., University of Wyoming and Laramie Energy Research Center, U.S. ERDA. American Institute of Mining, Metallurgical, and Petroleum Engineers, Inc. Abstract A second underground coal gasification experiment is being conducted at the Laramie Energy Research Center's field site near Hanna, Wyoming. This paper presents the results from the first phase of this Hanna II experiment in which coal seam permeability was evaluated, pneumatic linking and linking via reverse combustion were studied, and a sustained gasification process was maintained between the two linked vertical wells. Extensive in situ and surface process instrumentation have provided considerable information on the chemical and physical mechanisms involved in underground coal gasification. Air injection alone did not increase permeability to levels which would allow sustained gasification. Reverse combustion linking was determined to be a local, relatively low temperature process which advanced at a 5 ft/day rate and produced a high permeability carbonized path, Subsequent gasification was completed over a 38 day period. Overall, injection of 1.9 MM scf/day of air yielded 2.7 MMscf/day of gas with a heating value of 152 Btu/scf. Material balance calculations indicate that 1688 tons of coal in place were utilized. Specific discussion of reaction front configurations and interpretation of in situ thermometry are included. Introduction Underground coal gasification (UCG) has been the subject of investigations for more than 100 years. The process has been shown to be technically feasible in several experiments, but previously has been economically unattractive in competition with petroleum resources. The recent development of shortages of inexpensive petroleum fuels has resulted in rekindled petroleum fuels has resulted in rekindled interest in research on efficient in situ gasification of coals in the United States using modern techniques which were not available to earlier investigators. Russian activities in underground gasification of coal have been the most sustained. Electricity has been generated from low Btu gas at several large scale plants in the Soviet Union from plants in the Soviet Union from subbituminous coals and lignites since 1960. Recently, diminished Soviet utilization of UCG for energy production is believed due to the discovery of adequate local petroleum fuel sources." @default.
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• W2022659296 date "1975-09-28" @default.
• W2022659296 modified "2023-09-25" @default.
• W2022659296 title "Interpretation Of Chemical And Physical Measurements From An In Situ Coal Gasification Experiment" @default.
• W2022659296 doi "https://doi.org/10.2118/5654-ms" @default.
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