Enhanced oil recovery techniques - petrofed.winwinho...

Chemical EOR ProcessOBJECTIVES OF CHEMICAL FLOODING• Increase the Capillary Number Nc to mobilize residual oil• Decrease the Mobility Ratio M for better sweep• Emulsification of oil to facilitate productionThe process also called as micellar or micro emulsion flooding,consists of injecting a slug that contains surfactant, co-surfactants, oil, water and other chemicals. The function of thesurfactant is to reduce oil/water interfacial tension, but it mayalso cause inter phase mass transfer of reservoir oil and water.Both the inter phase mass transfer and reduction of IFT increaserecovery of oil. Surfactant slug is often followed by polymerthickened water to improve sweep efficiency.