THE INFLUENCE OF ALCOHOL TYPE AND CONCENTRATION ON THE PHASE BEHAVIOR AND INTERFACIAL TENSION IN OIL-SURFACTANT- COSURFACTANT-BRINE MIXTURE SYSTEM

Hadi Purnomo
Nuraini Nuraini
Tjuwati Makmur

Scientific Contribution Oil and Gas
Vol. 27 No. 2 (2004): SCOG

The number of mechanism is limited for reducingthe entrapment of oil in the pore space of reservoir rockand for mobilizing that residual which remains entrapped,thereby improving the microscopic displacement effi-ciency of a petroleum recovery process. After primaryrecovery by flow powered by the energy stored in thecompressed fluids of reservoir, and secondary recoveryby injection-pump driven water flooding, residual oil istrapped by the capillary pressure developed by interfa-cial tension in curved menisci between oil and water inthe pore space. Figure 1.1 illustrates the interplay ofcapillary and viscous forces in the water flooding pro-cess. Shown in the figure is water displacing oil. Theimportant point is that residual oil is trapped in the porespace by interfacial tension. To improve micros- copicdisplacement efficiency is to reduce interfacial tensionbetween oil and water.