Abstract: Use of an air-blown underground coal gasification plant to produce low-Btu gas thereby providing boiler fuel needed for an oxygen-blown underground coal gasification plant. The product from the oxygen-blown plant can be used for the production of synthetic natural gas or other uses. A preferred production gasification is also shown.
Type:
Grant
Filed:
December 5, 1985
Date of Patent:
May 5, 1987
Assignee:
Amoco Corporation
Inventors:
Rajen Puri, Luis E. Arri, Bruce W. Gash
Abstract: Underground coal gasification process containing a novel system of injection and production wells. Specifically, the injection well is positioned at an angle with respect to horizontal of less than the angle of repose of loose coal and char for the particular coal seam, and the production well is positioned at an angle with respect to horizontal of greater than the angle of repose but less than 90.degree.. This system protects the injection well during the process and places the production well in a position for maximum production while relieving it of certain tensile and shear stresses.
Type:
Grant
Filed:
November 27, 1985
Date of Patent:
March 10, 1987
Assignee:
Amoco Corporation
Inventors:
Bruce W. Gash, Luis E. Arri, Elton B. Hunt, Jr., David R. Parrish
Abstract: A method of producing viscous oils from reservoirs containing unconsolidated or friable sands comprising drilling the well, stimulating same with steam at a pressure sufficient to fracture the reservoir adjacent the well, shutting in the well, installing a gravel pack, producing oil from the well, and periodically, subsequently stimulating the well by injecting steam at a pressure below that which would result in a fracture of the reservoir.