The stability of coalbed methane(CBM)well foams determines the effect of CBM development.In this study,ionic liquids(ILs)-based additives were introduced to improve the stability of surfactant foams.The effect of ILs was examined in a large number of foam experiments at room temperature.The foam properties of the surfactants(MX)were evaluated in the presence and absence of ILs at different mixing ratios.The results showed that imidazole-and eutectic-based ILs were able to improve surfactant foam stability at elevated temperatures to varying degrees,with the effect on foam stability being more pronounced at a surfactant/IL mixing ratio of 60∶40.The highest foam stability increment for the best formulation amounted to 136%of the IL-free formulation.The results indicated that ionic liquids had a great potential to improve the stability of surfactant foam ability during coalbed methane development.
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