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Title: Method for control of subsurface coal gasification

Abstract

The burn front in an in situ underground coal gasification operation is controlled by utilizing at least two parallel groups of vertical bore holes disposed in the coalbed at spaced-apart locations in planes orthogonal to the plane of maximum permeability in the coalbed. The combustion of the coal is initiated in the coalbed adjacent to one group of the bore holes to establish a combustion zone extending across the group while the pressure of the combustion supporting gas mixture and/or the combustion products is regulated at each well head by valving to control the burn rate and maintain a uniform propagation of the burn front between the spaced-apart hole groups to gasify virtually all the coal lying therebetween.

Inventors:
 [1]
  1. Uniontown, PA
Issue Date:
Research Org.:
MERC/ERDA
OSTI Identifier:
862726
Patent Number(s):
3997005
Application Number:
05/625,273
Assignee:
United States of America as represented by United States Energy (Washington, DC)
Patent Classifications (CPCs):
E - FIXED CONSTRUCTIONS E21 - EARTH DRILLING E21B - EARTH DRILLING, e.g. DEEP DRILLING
Resource Type:
Patent
Country of Publication:
United States
Language:
English
Subject:
method; control; subsurface; coal; gasification; burn; front; situ; underground; operation; controlled; utilizing; parallel; vertical; bore; holes; disposed; coalbed; spaced-apart; locations; planes; orthogonal; plane; maximum; permeability; combustion; initiated; adjacent; establish; zone; extending; pressure; supporting; gas; mixture; products; regulated; head; valving; rate; maintain; uniform; propagation; gasify; virtually; lying; therebetween; bore holes; gasification operation; maximum permeability; underground coal; combustion products; combustion zone; coal gasification; gas mixture; coal gas; combustion product; spaced-apart locations; situ underground; burn front; holes disposed; vertical bore; supporting gas; apart locations; bed adjacent; /166/

Citation Formats

Komar, Charles A. Method for control of subsurface coal gasification. United States: N. p., 1976. Web.
Komar, Charles A. Method for control of subsurface coal gasification. United States.
Komar, Charles A. Tue . "Method for control of subsurface coal gasification". United States. https://www.osti.gov/servlets/purl/862726.
@article{osti_862726,
title = {Method for control of subsurface coal gasification},
author = {Komar, Charles A},
abstractNote = {The burn front in an in situ underground coal gasification operation is controlled by utilizing at least two parallel groups of vertical bore holes disposed in the coalbed at spaced-apart locations in planes orthogonal to the plane of maximum permeability in the coalbed. The combustion of the coal is initiated in the coalbed adjacent to one group of the bore holes to establish a combustion zone extending across the group while the pressure of the combustion supporting gas mixture and/or the combustion products is regulated at each well head by valving to control the burn rate and maintain a uniform propagation of the burn front between the spaced-apart hole groups to gasify virtually all the coal lying therebetween.},
doi = {},
journal = {},
number = ,
volume = ,
place = {United States},
year = {1976},
month = {12}
}

Patent:

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