Method for gasification of deep, thin coal seams

Patent · Fri Jan 01 00:00:00 EST 1982

OSTI ID:864235

Gregg, David W ^[1]

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1. Moraga, CA

A method of gasification of coal in deep, thin seams by using controlled bending subsidence to confine gas flow to a region close to the unconsumed coal face. The injection point is moved sequentially around the perimeter of a coal removal area from a production well to sweep out the area to cause the controlled bending subsidence. The injection holes are drilled vertically into the coal seam through the overburden or horizontally into the seam from an exposed coal face. The method is particularly applicable to deep, thin seams found in the eastern United States and at abandoned strip mines where thin seams were surface mined into a hillside or down a modest dip until the overburden became too thick for further mining.

• Research Organization: Lawrence Livermore National Laboratory (LLNL), Livermore, CA (United States)
• DOE Contract Number: W-7405-ENG-48
• Assignee: United States of America as represented by United States (Washington, DC)
• Patent Number(s): US 4334579
• OSTI ID: 864235
• Country of Publication: United States
• Language: English

Related Subjects

method
gasification
deep
coal
seams
controlled
bending
subsidence
confine
gas
flow
region
close
unconsumed
injection
moved
sequentially
perimeter
removal
production
sweep
holes
drilled
vertically
seam
overburden
horizontally
exposed
particularly
applicable
found
eastern
united
abandoned
strip
mines
surface
mined
hillside
modest
dip
thick
mining
coal seam
particularly applicable
gas flow
coal seams
region close
moved sequentially
/166/