Page 191 - Open-Hole Log Analysis and Formation Evaluation

grains/gal at 75°F—>
NaCl
|
CONCENTRATION
ppm——
domo
dog
BE
DN
wy
£
x
2
~
n
FOR Nacl
SOLUTIONS
176
e
°
AYNLVESdW3L
doGL
05 /ujosB
RESISTIVITY OF SOLUTION (OHM-METERS)
9.
w+—do
.
sgt
URE 9.11 Solution Resistivity vs. Temperature and Concentration. Courtesy Schlumberger Well
Services.
o \ i>

The
same
Step
ratio,
more
ratio
to
where
SP
4:
SP
x =
“whenever
Ruel Rwe
K
QUESTION
is
ionic
=
=
=
found
conversion. Of
or
0.08
#9.4
provided
#9.5
mix;
X
a
Rng
Rmje/Rwe
equation
Ryps75
from
(T°F
tO
1O-sP/K,
figure
Note
+
the

when
may
is greater |
82/187
nn
more
SP.
(0.6414
the
Rie
be:
calculator
Of Ryz
Rye bY
R,,, than
505)/8.
7/180
Ratio from
is
used
mud
mo R,. is found by dividing the known value of Step 5: Computing calculator 9.13 to find value of Rmjo/ Rwe The -100 mV and temperature is QUESTION FIG § ~~ Raye: Ry at formation temper ature is in addition to sodium chloride. Mud may formation waters containing some magnesium back an R,. that figure is It is also applicable to step 6 where an R,,,
+
using
formation
SP
is
Ringe
the
0.1 Om
the
0.036
9.12
is available:

direct ly
fresh,
it
Alternatively,
Om.
to

4 (75°F)
filtrates
R,).
r
Use
Hilchie

figure
approximation

to
Ry,
to
compute
constructed
not
normal
9.13
figure
be
180°F.
by
to
the
=
for
equation
the
and calcium
relationship Rife.
9.12
the
Use
Of RingtO
9:89.
may be
treat
contain
to
data
states

of
Ryze:
converted
the
average
cations
Rmy
find
oy
Rmpe/ Rue
|
either a
used.
:
the.
.
Ry, sol Rive