Experimental Study of Miscible Fluid Injection in Iranian Artificially Fractured Porous Media

Abstract

Miscible displacement experiments were performed to study recovery efficiency by gravity drainage in Asmari fractured cores. We used vertically mounted 0.0381 m diameter fractured and non-fractured cores. Kerosene was used as the oil (displaced fluid) and heptane as the displacing fluid. Effects of the fracture, displacement rate and matrix-fracture mass transfer on the oil recovery were studied. Experimental results showed that for displacement rates below the critical flow rate, a significant amount of the displacing fluid flows from fracture to the matrix and a significant amount of the matrix oil flows from matrix to fracture. Thus, for displacement rates below critical flow rate, miscible injection in fractured porous media could be very efficient.