Foam drainage agent with corrosion inhibition and anti-freezing functions and preparation method thereof

The invention provides a foam drainage agent with corrosion inhibition and anti-freezing functions and a preparation method thereof, and belongs to the technical field of natural gas extraction. Comprising the following components in parts by weight: 5 to 10 parts of perfluorooctyl sulfonyl diethanol amine, 20 to 30 parts of polyoxyethylene castor oil sulfate salt, 10 to 20 parts of corrosion inhibitor, 5 to 10 parts of sapindus essence, 15 to 25 parts of propylene glycol, 1 to 10 parts of silicon dioxide powder loaded with the corrosion inhibitor, 5 to 10 parts of ethylene oxide-propylene oxide segmented copolymer and 1 to 10 parts of water. The preparation method comprises the following steps: uniformly mixing polyoxyethylene castor oil sulfate with perfluorooctyl sulfonyl diethanol amine and propylene glycol, then adding a corrosion inhibitor, silicon dioxide powder loaded with the corrosion inhibitor, an ethylene oxide-propylene oxide segmented copolymer and water, carrying out a constant-temperature reac