Fluoride-containing polyurethane CO2 gas soluble foaming agent and preparation method and use thereof

The invention provides a CO2 gas soluble foaming agent and a preparation method and application thereof, and belongs to the field of oil field chemicals. The CO2 gas soluble foaming agent is allyl polyoxyethylene ether fluorine-containing polyurethane sodium sulfonate which is obtained by sultified reaction of sodium bisulfate aqueous solution and allyl polyoxyethylene ether fluorine-containing polyurethane Z, wherein the allyl polyoxyethylene ether fluorine-containing polyurethane Z is a product of diazonium addition reaction of fluorine-containing alcohol Rf-Oh, R2 substituted allyl polyether and isocyanate group in diisocyanate CON-R1-NCO. The allyl polyoxyethylene ether fluorine-containing polyurethane sodium sulfonate can be alone dissolved in CO2 or dissolved in CO2 with a dissolved in CO2, subsequently injected into the formation, preferentially enters a high permeability zone with the CO2, and meets bound water in the formation or a subsequent auxiliary slug to use as a foaming agent to produce foams to inhibit fluid channeling in subsequent CO2 displacement process.