The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Feb. 02, 1982
Filed:
Jul. 21, 1980
Applicant:
Inventors:
Shirley C Tsai, Pittsburgh, PA (US);
Richard H Graham, O'Hara Township, Allegheny County, PA (US);
Robin R Oder, Export, PA (US);
Assignee:
Gulf Research & Development Company, Pittsburgh, PA (US);
Primary Examiner:
Int. Cl.
CPC ...
C10J / ; E21B / ; E21B / ; E21C / ;
U.S. Cl.
CPC ...
166248 ; 48DI / ; 166259 ;
Abstract
In the underground gasification of a swelling coal the high gas-flow link between the injection and the production wells needed for the gasification process is produced by reverse combustion using air heated to a temperature below the softening point of the coal. The heated air pretreats and conditions the coal proximate to the link under formation by increasing its permeability and reducing its swelling properties. Improved combustion and suppression of plugging results in the subsequent gasification stage.