▎ 摘　　要

NOVELTY - Gemini surfactant (I) is new. USE - Gemini surfactant used for used as a particle stabilized emulsion flooding system, which is used in tertiary oil recovery, and as a particle stabilized emulsion flooding system (all claimed). ADVANTAGE - The gemini surfactant can exert the synergistic effect of the surfactant and the nanoparticle, have low interfacial tension, strong oil washing ability and emulsifying and sweeping effect, improve the microscopic sweeping efficiency of the low-permeability oil reservoir, and thus improve the recovery yield, and preparation method of the nanoparticle and the surfactant composition is simple, and it can be industrially produced on a large scale, and has a broad application prospect in low-permeability oil reservoirs, and composite flooding composition comprising two-dimensional nanoparticles can effectively block high-permeability channels, reduce sewage discharge, reduce ineffective circulation and ineffective energy consumption, and has broad application prospects. DETAILED DESCRIPTION - Gemini surfactant of formula (I) is new. R1=2-6C alkane, alkene or aromatic hydrocarbon; R2=-CH3, -CH2CH3, -CH2CH2CH3or -C6H5; R3=-CH2CO2-Na+, -CH2CH2CO2-Na+, -COCHCHCO2-Na+, -CH2CH2SO3-Na+, CH2CH2CH2SO3-Na+, -CH2CH(OH)CH2SO3-Na+or -CH2CH2CH2CH2SO3-Na+; R4=alkane-CnH2n+1, alkene-CnH2n-1or alkyl aromatic hydrocarbon-CnH2n-7; and n=6-18. INDEPENDENT CLAIMS are included for the following: 1. a method for preparing compound of formula (I); 2. a composition comprises two-dimensional nanoparticles and a Gemini surfactant; and 3. a method for tertiary oil recovery, which involves using the composition as an oil displacement slug to perform huff and puff or oil displacement.