US 9,810,050 B2
Enhanced coal-bed methane production
O. Angus Sites, Spring, TX (US); and Lalit K. Bohra, Spring, TX (US)
Assigned to ExxonMobil Upstream Research Company, Spring, TX (US)
Appl. No. 14/358,687
Filed by O. Angus Sites, Spring, TX (US); and Lalit K. Bohra, Spring, TX (US)
PCT Filed Nov. 16, 2012, PCT No. PCT/US2012/065656
§ 371(c)(1), (2) Date May 15, 2014,
PCT Pub. No. WO2013/095829, PCT Pub. Date Jun. 27, 2013.
Claims priority of provisional application 61/578,045, filed on Dec. 20, 2011.
Prior Publication US 2014/0338901 A1, Nov. 20, 2014
Int. Cl. E21B 43/16 (2006.01); E21B 43/00 (2006.01); F01K 23/10 (2006.01); F01K 23/16 (2006.01); F02C 1/08 (2006.01); F02C 3/22 (2006.01); F22B 1/18 (2006.01)
CPC E21B 43/164 (2013.01) [E21B 43/006 (2013.01); E21B 43/16 (2013.01); F01K 23/10 (2013.01); F01K 23/16 (2013.01); F02C 1/08 (2013.01); F02C 3/22 (2013.01); F22B 1/1815 (2013.01); Y02E 20/16 (2013.01)] 23 Claims
OG exemplary drawing
 
1. A method for enhanced recovery of coalbed methane, comprising:
compressing a gaseous fuel for use in a semi-closed Brayton cycle power plant;
generating a gas mixture comprising N2 and CO2 in the semi-closed Brayton cycle power plant operating to combust the gaseous fuel and an oxygen component of an oxidant at a stoichiometric ratio;
injecting at least a portion of the gas mixture into a coal bed; and
recovering a mixed production gas comprising methane from the coal bed.