Foaming agents for use in coal seam reservoirs

Details Foaming agents for use in coal seam reservoirs Foaming agents for use in coal seam reservoirs

C - Chemistry, Metallurgy

09

K

C09K 8/70 (2006.01) C09K 8/80 (2006.01) E21B 43/25 (2006.01)

Patent

CA 2401150

A well treatment fluid composition that comprises a carrier fluid and an amphoteric surfactant, and optionally a viscosifying agent and proppant, is well suited for use in fracturing coal beds to stimulate methane production. The composition preferably is a foam that comprises a gas such as nitrogen or air. Preferably, the surfactant has formula R-NH2-(CH2)n-C(O)OX, wherein R is a saturated or unsaturated alkyl group having from 6-20 carbon atoms, n is from 2-6, and X is hydrogen or a salt forming cation.

La présente invention concerne une composition fluidique de traitement de puits, comprenant un fluide support, un agent tensio-actif amphotère et éventuellement un agent d'amélioration de la viscosité et un agent de soutènement. Cette composition convient à un usage dans des couches de charbon se fracturant, afin de stimuler la production de méthane. Cette composition est de préférence une mousse qui comprend un gaz, tel que de l'azote ou de l'air. Ledit agent tensio-actif présente de préférence la formule R-NH2-(CH2)n-C(O)OX, dans laquelle R représente un groupe alkyle saturé ou insaturé, ayant de 6 à 20 atomes de carbone, n vaut de 2 à 6 et X représente hydrogène ou un cation formant un sel.

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