In this paper experimental results obtained for the oilrndisplacement by water within a two-dimensional vuggyrnfractured porous cell are presented. The experiments wererncarried out with an acrylic cell, where fractures werernrepresented by channels of 1.6 mm wide, 1.2 mm deep and 19rncm long, whereas the vugs were represented by cylinders of 1rncm diameter and 1.2 mm deep.rnThe experimental procedure is as follows: the cell,rnsaturated 100% with oil was placed horizontally and at timernt=0 water was injected at a constant rate. Photographs wererntaken to follow the water front in the cell; then, the arearncorresponding to oil and water was measured. In this way thernwater saturation in the cell was determined. This waterrnsaturation is equal to the oil recovery, considering oil andrnwater as incompressible fluids.rnBased on the experimental results, a theoretical model wasrndeveloped. This model considers that the porous space isrnconstituted by two regions: one that can conduct fluids, calledrnflow region and a stagnant region that interchange matter withrnthe flow region through a diffusion-like process. Analyticalrnsolutions for water saturation and normalized oil recovery arernpresented.rnThe model fitted in a reasonable way the experimental datarnof normalized oil recovery, indicating that the theoreticalrnmodel can be a useful tool to explain oil recovery processes inrnvuggy fractured reservoirs.
展开▼
