Bibliographic Citation
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Title | Method of underground gasification of a series of gently dipping and inclined coal seams |
Creator/Author | Kazak, V.N. ; Kapralov, V.K. ; Volk, A.F. |
Publication Date | 1986 Sep 09 |
OSTI Identifier | OSTI ID: 5308958 |
Report Number(s) | US 4610303 |
Resource Type | Patent |
Resource Relation | Pat. File: Filed date 16 Nov 1984 |
Subject | 010404 -- Coal, Lignite, & Peat-- Gasification; IN-SITU GASIFICATION-- INJECTION WELLS; BOREHOLE LINKING;CAVING;COAL GASIFICATION;COAL MINING;COAL SEAMS;COMBUSTION;DEPTH;INCLINATION;RECOMMENDATIONS;ROCK DRILLING;SAFETY;THICKNESS |
Related Subject | CHEMICAL REACTIONS;COAL DEPOSITS;DIMENSIONS;DRILLING;GASIFICATION;GEOLOGIC DEPOSITS;IN-SITU PROCESSING;MINERAL RESOURCES;MINING;OXIDATION;PROCESSING;RESOURCES;THERMOCHEMICAL PROCESSES;WELLS |
Description/Abstract | A method is described of underground gasification of a series of gently dipping and inclined coal seams comprising the steps of: determining the depth of occurrence and the thickness of each coal seam in a series; determining a safe mining depth for each coal seam in the series; opening the coal seams by drilling operating injection and production wells; interconnecting the drilled operating wells within the seam to be gasified; setting the coal afire and establishing gasification passages within the coal seam; gasifying each subsequent seam on completion of gasification of the preceding seam by supplying a gaseous medium into the first wells and removing the produced gas from the second wells, the gasification being effected upwards from the underlying seam to the overlying seams with a rock thickness therebetween exceeding a safe mining depth for the underlying seams or downwards from the overlying seam to the underlying seams with a rock thickness therebetween being smaller than the safe mining depth of the underlying seams.^The gasification of the subsequent seam is effected after the rock overlying the gasified seam is no longer shifted.^The shift thereof is associated with the gasification, a firing boundary of the underlying seam being shifted towards a coal pillar by an amount equal to or greater than a first spacing of rock caving in the roof of the gasified seam. |
Country of Publication | United States |
Language | English |
Format | Pages: v |
Rights | Vsesojuznoe Nauchno-Proizvodtvennoe Obiedinenie ``Sojuzpromgaz`` |
System Entry Date | 2001 May 13 |
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