Page 313 - Standard Handbook Petroleum Natural Gas Engineering VOLUME2

280 Reservoir Engineering

into account that fluid (i.e., water) is injected at one point in a reservoir and
that other fluids (i.e., oil, water) are produced from another point (Figure 5-158).
Volumetric sweep efficiency, the percentage of the total reservoir contacted by
the injected fluid (often called fluid conformance), is composed of areal (or
pattern) efficiency and vertical sweep.

WATER _.)

RESERVOIR ROCK

MICROSCOPIC SWEEP

IN J ECTlO N PRODUC I NG
WELL WELL

AREAL SWEEP

WATER OIL AND WATER
1 4

I N J ECTlON PRODUCING
WELL WELL
VERTICAL SWEEP
Figure 5-158. Sweep efficiencies.