Method for gasification of deep, thin coal seams

Gregg, David W

Title: Method for gasification of deep, thin coal seams

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Abstract

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.

Inventors:

Gregg, David W ^[1]

Moraga, CA

Issue Date:: 1982-01-01

Research Org.:: Lawrence Livermore National Lab. (LLNL), Livermore, CA (United States)

OSTI Identifier:: 864235

Patent Number(s):: 4334579

Assignee:: United States of America as represented by United States (Washington, DC)

Patent Classifications (CPCs):: E - FIXED CONSTRUCTIONS E21 - EARTH DRILLING E21B - EARTH DRILLING, e.g. DEEP DRILLING

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E - FIXED CONSTRUCTIONS E21 - EARTH DRILLING E21B - EARTH DRILLING, e.g. DEEP DRILLING
E21B43/243 - Combustion in situ
E21B43/295 - Gasification of minerals, e.g. for producing mixtures of combustible gases
E21B43/305 - {comprising at least one inclined or horizontal well}

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DOE Contract Number:: W-7405-ENG-48

Resource Type:: Patent

Country of Publication:: United States

Language:: English

Subject:: 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/

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                    Gregg, David W. Method for gasification of deep, thin coal seams.  United States: N. p., 1982. 
        Web.

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                    Gregg, David W. Method for gasification of deep, thin coal seams.  United States.

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                    Gregg, David W. Fri .  
        "Method for gasification of deep, thin coal seams".  United States.  https://www.osti.gov/servlets/purl/864235.

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@article{osti_864235,

  title        = {Method for gasification of deep, thin coal seams},

  author       = {Gregg, David W},

  abstractNote = {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.},

  doi          = {},

  journal      = {},
number       = ,

  volume       = ,

  place        = {United States},

  year         = {1982},

  month        = {1}

}

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