Method for the recovery of coal bed methane

Details Method for the recovery of coal bed methane Method for the recovery of coal bed methane

E - Fixed Constructions

21

B

E21B 43/16 (2006.01) E21B 43/00 (2006.01) E21B 43/17 (2006.01) E21B 43/40 (2006.01)

Patent

CA 2175248

A method of recovering methane from a solid carbonaceous subterranean formation having a production well in fluid communication with the formation and am injection well in fluid communication with the formation, comprising the steps of passing a gaseous fluid containing at least 60 volume percent nitrogen and at least 15 volume percent oxygen through a membrane separator to produce an oxygen- depleted effluent, pressurizing the oxygen-depleted effluent to a pressure above a reservoir pressure of the solid carbonaceous subterranean formation, injecting the oxygen-depleted effluent into the formation through the injection well, and recovering a fluid comprising methane through the production well.

Un procédé de récupération du méthane dans une formation souterraine carbonée solide comprenant un puits de production ainsi qu'un puits d'injection, tous deux en communication fluidique avec la formation. Ledit procédé consiste à faire passer un fluide gazeux contenant au moins 60% en volume d'azote et au moins 15% en volume d'oxygène dans un séparateur à membrane de manière à produire un effluent appauvri en oxygène, à pressuriser ce dernier à une pression supérieure à celle du réservoir de la formation souterraine carbonée solide, à injecter l'effluent appauvri en oxygène dans la formation par le puits d'injection, et à récupérer un fluide contenant du méthane par le puits de production.

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