Results of the fourth Hanna field test
The second phase (Hanna IVB) of a coal gasification experiment near Hanna, Wyoming, was completed in September 1979. The experiment attempted to link and gasify coal between process wells spaced 34.3 meters apart. Intermediate wells were positioned between the process wells so that the link could be relayed over shorter distances. Reverse combustion linking was attempted over a 22.9-meter and a 11.4-meter distance of the total well spacing. Thermal activity was generally noted in the upper 3 meters of the coal seam during the link. Two attempts to gasify over the 34.3-meter distance resulted in the propagation of the burn front at the coal overburden interface. Post-burn evaluation indicates fractures as major influencing factors of the combustion process. The Hanna IVB field test provided much insight into influence that geologic features have on in situ coal combustion. The influence of these faults, permeable zones, and cleats, on the air flow patterns can drastically change the overall results of a gasification experiment and should be studied further. The overall results of Hanna IVB were discouraging because of the rapid decline in the heating values for the production gas and the amount of coal gasified. With more complete geologic characerization prior to experimentation and proper well completions, it is believed that most of the subsurface operational problems encountered during Hanna IV could have been avoided.
- Research Organization:
- Department of Energy, Laramie, WY (USA). Laramie Energy Research Center; Sandia National Labs., Albuquerque, NM (USA)
- Sponsoring Organization:
- USDOE
- DOE Contract Number:
- AC04-76DP00789
- OSTI ID:
- 5359004
- Report Number(s):
- SAND-80-0847C; CONF-800716-13
- Country of Publication:
- United States
- Language:
- English
Similar Records
Depositional environments, subsurface stratigraphy, and post-burn characterization of the Paleocene-Eocene Hanna Formation at the Hanna, Wyoming underground coal-gasification site: Hanna II Phase 1 experiment. [Hanna II; post mortem examination]
Depositional environments, subsurface stratigraphy, and post-burn characterization of the Paleocene-Eocene Hanna formation at the Hanna, Wyo UCG site: Hanna III experiment. [Hanna III post mortem]
Related Subjects
010404* -- Coal
Lignite
& Peat-- Gasification
BOREHOLE LINKING
CHEMICAL REACTIONS
COAL GASIFICATION
COMBUSTION
DATA ACQUISITION SYSTEMS
GASIFICATION
IGNITION
IN-SITU GASIFICATION
IN-SITU PROCESSING
MEASURING INSTRUMENTS
NORTH AMERICA
OXIDATION
PROCESSING
REVERSE COMBUSTION
ROCKY MOUNTAIN REGION
THERMOCHEMICAL PROCESSES
USA
WELL COMPLETION
WYOMING