![]() ![]() When the oil is less viscous than the water, the water areally displaces the oil very efficiently. When the oil is more viscous than the water, the water areally displaces the oil less efficiently. 2 through 4 show that the water/oil viscosity ratio is critical to the efficiency of the waterflood displacement. The horizontal lines indicate what the range of mobility ratios M would be if it were calculated using the water mobility at floodout conditions (the right extremity of the horizontal bar) or using the water mobility at the flood front (the left extremity of the bar), with the arrows indicating that the values were off the scale of this plot.įigs. On this figure, the mobility M has been calculated using the average water saturation in the water-contacted portion of the reservoir. 4 – Correlation of areal sweep efficiency at breakthrough with mobility ratio for miscible and immiscible displacement in five-spot-pattern floods. 4 plots the breakthrough areal-sweep efficiency as a function of M for a five-spot-pattern flood.įig. 3 shows the X-ray shadowgraphs of a waterflood of two five-spot homogeneous sandpacks, one whose mobility ratio is favorable ( M = 0.40) and one whose mobility ratio is unfavorable ( M = 1.43). 2 plots the waterflood performance of a five-spot experimental homogeneous sandpack for range of water/oil viscosity ratios from 0.83 (slightly favorable) to 754.0 (very unfavorable). 1) provides an effective review of the areal aspects of waterflooding. Waterflood displacement in a five-spot patternīecause it has been studied extensively, taking a look at the five-spot pattern ( Fig.
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