الفهرس 
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Abstract
Oil recovery after water flood, by sur-
factant-polymer flooding at different percentages
of clay content, has been studied for July oil field.
Formation water (72000 PPM) and crude oil of the
July field have been used •
(40-65
July
The study was performed on
Mesh) to represent the porous
field. Bentonite, a colloidal
sand packs
media of
clay
from
Wyoming Company,
dispersion into
U.S.A., has been used as
sand-packs. Dowell EZEFLO
and polyacrylamide were used
This study concentrates on
clay
factant, F-75,
this study
effect of
sur-
in
the
various
percentages
of
clay
content
( 0 %, 3. 5%, 5%,
tertiary oil
10%, 15% and 20%) on
recovery. The effect
secondary and
of surfactant
concentration on tertiary oil recovery at the
mentioned clay content values has• been also studied
to determine the maximum ultimate oil recovery
for each case •
The experimental results show that :
1- The major factor affecting tertiary oil recovery
by surfactant-polymer method is the surfactant
concentration,
the
recovery
is
improved
as
the concentration increased .
2- For any clay content, as the surfactant con-
centration increases the oil production starts
sooner (earlier break - through) and sustains
at higher level •
3- For clay content less than
oil recovery is inversely
clay percentage .
15%, the ultimate
proportional with
4- For
oil
value of
clay content more
than 15%
the
the
recovery
increases
with
increasing
surfactant concentration up to the value of
4 % and after that the recovery decreases. Thus
this value (4%) is taken as the optimum value
of surfactant concentration in this case •
5- For any slug concentration, as the clay content
increases, the oil break-through is delayed.