Method for gasification of deep, thin coal seams. [DOE patent]

Patent · Fri Aug 29 04:00:00 EDT 1980

OSTI ID:6786858

Gregg, D W

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 is given. 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.

• DOE Contract Number: W-7405-ENG-48
• Assignee: TIC; ERA-06-019626; EDB-81-060353
• Patent Number(s): None
• OSTI ID: 6786858
• Country of Publication: United States
• Language: English

Related Subjects

01 COAL, LIGNITE, AND PEAT
010404* -- Coal
Lignite
& Peat-- Gasification
ABANDONED SITES
BOREHOLE LINKING
COAL DEPOSITS
COAL GASIFICATION
COAL SEAMS
CONTROL
DEPTH
DIMENSIONS
DIRECTIONAL DRILLING
DRILLING
GASIFICATION
GEOLOGIC DEPOSITS
GROUND SUBSIDENCE
IN-SITU GASIFICATION
IN-SITU PROCESSING
MINERAL RESOURCES
MINING
PROCESSING
RESOURCES
SURFACE MINING
THERMOCHEMICAL PROCESSES
THICKNESS