1
Rajen Puri, Dan Yee, John P Seidle: Method for producing natural gas from a coal seam. Amoco Corporation, Scott H Brown, Fred E Hook, July 12, 1988: US04756367 (261 worldwide citation)

Disclosed herein is a method of degasification, wherein gas and water production from a coal field are maintained at high rates regardless of temporary changes in market demand. While all the produced water is disposed, surplus gas is reinjected in coal by converting some of the producers to injecto ...


2
Rajen Puri, Paul T Pendergraft: Method for producing methane-containing gaseous mixtures. Amoco Corporation, Scott P McDonald, Richard A Kretchmer, February 14, 1995: US05388645 (253 worldwide citation)

Processes are disclosed for separating an oxygen-containing gas into oxygen-enriched and oxygen-depleted streams. The oxygen-depleted stream is injected into a methane-containing solid carbonaceous subterranean formation to produce a methane-containing gaseous mixture. The oxygen-enriched stream is ...


3
Joseph J Chaback, Dan Yee, Richard F Volz Jr, John P Seidle, Rajen Puri: Method for treating a mixture of gaseous fluids within a solid carbonaceous subterranean formation. Amoco Corporation, Charles P Wakefield, Richard A Kretchmer, August 8, 1995: US05439054 (239 worldwide citation)

A method for treating a mixture of gaseous fluids within a solid carbonaceous subterranean formation. In some embodiments, the invention provides for the disposal of a strongly adsorbing gaseous fluid within the formation. In other embodiments, the invention provides a means for fractionating a mixt ...


4
Rajen Puri: Method of underground conversion of coal. Standard Oil Company, Scott H Brown, Robert R Cochran, August 27, 1985: US04537252 (235 worldwide citation)

A method of converting coal and other solid carbonaceous material to gaseous and liquid products by heating the coal in the presence of the gaseous effluent to a sufficient temperature for pyrolyzing the coal to produce liquid and gaseous products. Thereafter, further gasifying the coal to produce a ...


5
Rajen Puri, Dan Yee: Method for producing methane-containing gaseous mixtures. Amoco Corporation, Scott P McDonald, Richard A Kretchmer, February 14, 1995: US05388640 (235 worldwide citation)

A method is disclosed for increasing the production of methane from a solid carbonaceous subterranean formation having a standard initial production rate of a methane-containing gas of X standard cubic feet per unit time. The method comprises the steps of injecting an inert methane-desorbing gas int ...


6
Rajen Puri, Luis E Arri, Bruce W Gash: Combination air-blown and oxygen-blown underground coal gasification process. Amoco Corporation, F E Hook, R R Cochran, T H Briggs, May 5, 1987: US04662443 (233 worldwide citation)

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 prod ...


7
Dan Yee, Rajen Puri: Coalbed methane recovery using pressure swing adsorption separation. Amoco Corporation, Charles P Wakefield, Richard A Kretchmer, Scott P McDonald, February 14, 1995: US05388643 (232 worldwide citation)

A method is disclosed for using a pressure swing adsorption separator system to provide an oxygen-depleted gaseous effluent for injecting into a suitable solid carbonaceous subterranean formation, such as a coalbed, to enhance the recovery of methane from the formation.


8
Rajen Puri, Dan Yee: Coalbed methane recovery using membrane separation of oxygen from air. Amoco Corporation, Charles P Wakefield, Richard A Kretchmer, Scott P McDonald, February 14, 1995: US05388642 (232 worldwide citation)

A method of recovering methane from a solid carbonaceous subterranean formation having a production well in fluid communication with the formation and an injection well in fluid communication with the formation, comprising the steps of passing a gaseous fluid containing at least 60 volume percent ni ...


9
Dan Yee, John P Seidle, Rajen Puri: Method for reducing the inert gas fraction in methane-containing gaseous mixtures obtained from underground formations. Amoco Corporation, Scott P McDonald, Richard A Kretchmer, February 14, 1995: US05388641 (232 worldwide citation)

A method for reducing the inert gas fraction volume percent present in a methane-containing mixture produced by injecting an inert gas into a solid carbonaceous subterranean formation is disclosed. The method reduces the inert gas fraction by suspending the injection of the inert gas or by reducing ...


10
Rajen Puri: Method of underground conversion of coal. Amoco Corporation, Fred E Hook, Robert R Cochran, May 5, 1987: US04662439 (229 worldwide citation)

A method of converting coal and other solid carbonaceous material to gaseous and liquid products by heating the coal in the presence of the gaseous effluent to a sufficient temperature for pyrolyzing the coal to produce liquid and gaseous products. Thereafter, further gasifying the coal to produce a ...