Areal Sweep Efficiency:
Apart from the dependence of “Areal Sweep Efficiency” on
fluid mobilities,
well pattern type,
areal-heterogeneity and
the total volume of injected fluid,
whether it has any relevance with
‘vertical heterogeneity’ and
the ‘degree of gravity segregation’?
The areal sweep efficiency E A is defined as the fraction of the total flood pattern that is contacted by the displacing fluid. It increases steadily with injection from zero at the start of the flood until breakthrough occurs, after which E A continues to increase at a slower rate.
It depends on flooding pattern, water-oil mobility ratio, and volume of water injected. is the fraction of vertical cross-sectional area of the reservoir between injector and producer wells which is swept by water at a given time. The vertical sweep efficiency depends heavily on heterogeneity of the reservoir rock [2].
Volumetric sweep efficiency is defined as being the fraction of the floodable pore volume swept or contacted by the injected water. Volumetric sweep efficiency is a combination of areal sweep and vertical sweep efficiencies as illustrated in Equation 1.٠٥/١٠/١٩٩٧
The areal sweep efficiency E A is defined as the fraction of the total flood pattern that is contacted by the displacing fluid. It increases steadily with injection from zero at the start of the flood until breakthrough occurs, after which E A continues to increase at a slower rate.
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