Alkali-free working fluid protection system and usage method thereof

The invention provides an alkali-free working fluid protection system and a usage method thereof. The alkali-free working fluid protection system comprises the following raw materials by mass ratio: 3-6 parts of zwitterionic Gemini surfactants, 1-3 parts of a nonionic surfactant, and 30-50 parts of an auxiliary agent. While in use, the alkali-free working fluid protection system and working fluid at temperature of 40-90 DEG C are uniformly mixed according to a mass ratio being 1:5-8, and then a mixture enters into a well. The alkali-free working fluid protection system is suitable for low-permeability oil reservoir working.