| abstract |
The invention proposes a wetting reversal agent for depressurization and boosting injection in an ultra-low permeability oil reservoir, which is prepared from the following raw materials: cationic gemini surfactant, nonionic surfactant, high-efficiency anti-swelling and shrinkage-swelling agent, Ethanol, ethylene glycol ether, deionized water; the cationic gemini surfactant has the structure shown in the following formula I: Wherein, n=3-18. The invention provides a wetting reversal agent for oilfield depressurization and injection and a preparation method thereof, which can improve the depressurization, injection and production enhancement effects of sensitive ultra-low permeability hydrophilic water-flooding high-pressure oil reservoirs. |