Foams have been used as hydraulic fracturing fluids for over twenty years. Their primary usage is in reservoirs that are under-pressured and/or water sensitive. Nitrogen was the gas initially used as the internal phase. Later, carbon dioxide became more widely accepted and provided better load recovery and production.

Now, a third generation of foams has been developed. Nitrogen and carbon dioxide used simultaneously as the internal phase has shown to further improve load recovery and production rates.

This paper will present a brief review of foam fracturing procedures and mathematics, monitoring hardware and software requirements, rigging up and safety requirements. The majority of the paper will center on foam fracturing treatments performed on low permeability reservoirs in Northwestern Oklahoma. A comparison of past and present treatments and production rates utilizing operator supplied logs and production data will be presented. Overall, the new Binary Foam treatments have shown to be beneficial from a treatment application viewpoint. Advantages include (reduced screenouts), increased load water recovery, decreased flaring time due to lack of pipeline acceptable gas and improved production rates.

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