Page 298 - Standard Handbook Petroleum Natural Gas Engineering VOLUME2

Secondary Recovery 265

A form of peripheral flooding is an end-to-end flood such as that shown in
Figure 5-149. This type of injection could include the injection of gas into a
gas cap or the injection of water into an aquifer. The choice of peripheral or
repeating pattern flood is usually made on the basis of: formation permeability,
formation dip, area and dimensions of the reservoir, and the initial production
response that is acceptable.
Pattern Flooding

In pattern flooding, the injectors are distributed among the producers in some
repeating fashion. Examples of the common repeating patterns are shown in
Figure 5-150. Pattern flooding is very common, and the selection of the type

DIRECT LINE DRIVE STAGGERED LINE DRIVE

\ f
/ /e---?,
\A---4/ \
-4' 0 \ / A b-
\
/
p-
\ I
\\ / /
\\ /
)+.-A/ \ ,*--a,
/
SEVEN- S POT INVERTED SEVEN-SPOT

NORMAL NINE- SPOT INVERTED NINE-SPOT
a injection well
0 Production well
--- Pattern boundary
Figure 5-150. Well locations in pattern floods.