System for improving coalbed gas production

E - Fixed Constructions – 21 – B

Patent

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E21B 43/25 (2006.01) E21B 43/00 (2006.01) E21B 43/30 (2006.01)

Patent

CA 2377943

A method of stimulating coalbed (5) methane production by injecting gas into a producer (2) and subsequently plac-ing the producer (2) back on production is described. A decrease in water production may also result. The increase in gas production and decrease in water production may result from: the displacement of water from the producer (2) by gas; the establishment of a mobile gas saturation at an extended distance into the coalbed (5), extending outward from the producer (2); and the reduction in coalbed (5) methane partial pressure between the coal matrix (11) and the coal's cleat system.

L'invention concerne un procédé permettant d'améliorer la production de méthane de couche de houille (5), qui consiste à injecter du gaz dans un producteur (2) puis de faire produire à nouveau ce dernier. Une réduction de la production d'eau peut également se produire. L'augmentation de la production de gaz et la réduction de la production d'eau peuvent être causées par le déplacement de l'eau du producteur (2) par le gaz, par l'établissement d'une saturation de gaz mobile à une profondeur importante dans la couche de houille (5), saturation qui s'étend vers l'extérieur du producteur (2), et par la réduction de la pression partielle du méthane de couche de houille (5) entre la matrice de charbon (11) et le système de limet du charbon.

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