LLL in situ coal gasification program. Quarterly progress report, July--September 1976
- eds.
Planning and field work continued for Phase 2 of Hoe Creek Experiment No. 1. Drilling and well completions were finished, the surface plant and test instrumentation were completed for hydraulic testing and dewatering, and hydraulic permeability tests were made. The four cores taken at locations 6 to 9 ft from shot sites were found to be similar in appearance, with moderate to heavy fracturing in the upper few feet of coal, followed by a less fractured zone, and then by a heavily fractured zone in the bottom 5 to 10 ft. The core between the two explosives locations showed the most fracturing, the core farthest away from either shot point exhibited the least fracturing. Improving agreement between the degree of fracturing and TENSOR and SOC code calculations is building confidence in the ability to predict extent of fracturing. A review of flow behavior before and after explosive fracturing in upper and lower portions of the coal during drilling and earlier well tests leads to the interpretation that native coal is reasonably homogeneous vertically, but that post-explosion flow conditions are not uniform. While cracks created by the explosion may promote high flows in the upper regions, fines generated by the explosions tend to restrict or plug flow in the lower regions.
- Research Organization:
- California Univ., Livermore (USA). Lawrence Livermore Lab.
- DOE Contract Number:
- W-7405-ENG-48
- OSTI ID:
- 7318772
- Report Number(s):
- UCRL-50026-76-3
- Country of Publication:
- United States
- Language:
- English
Similar Records
LLL in situ coal gasification program. Quarterly progress report, January--March 1976
LLL in situ coal gasification program. Quarterly progress report, April--June 1976
Related Subjects
010404* -- Coal
Lignite
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010600 -- Coal
Lignite
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CARBONACEOUS MATERIALS
COAL
COAL GASIFICATION
COMMINUTION
ENERGY SOURCES
EXPLOSIVE FRACTURING
FOSSIL FUELS
FRACTURING
FUELS
GASIFICATION
IN-SITU GASIFICATION
IN-SITU PROCESSING
MATHEMATICAL MODELS
MECHANICAL PROPERTIES
PLANNING
PROCESSING
SUBBITUMINOUS COAL