Abstract
W/O emulsification flooding is a new type of oil displacement method, which can effectively improve oil recovery, but there are few materials used for W/O emulsification at present. Therefore, we prepared a hydrophobic nano calcium carbonate (WS-Ca) and compounded it with Span80 to form a nano oil displacement system. The contact angle experiment demonstrates that WS-Ca is lipophilic material. After testing the emulsification performance, viscosity, interfacial tension and oil displacement performance of the oil displacement system, it is found that the nano oil displacement system with the best performance is WS-Ca (800ppm) +Span80 (1%), and the displacement system and oil are emulsified into W/O emulsion, and the viscosity of emulsion is 25 times that of crude oil. Furthermore, the oil displacement system can successfully lower the oil-water interfacial tension and increase the oil recovery of injection water to 62.63%.
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