STANDARD HANDBOOK OF PETROLEUM & NATURAL GAS ...

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714 Drilling and Well Completions
Table 4-69
Fluid Density Adjustment for Downhole Temperature Effect [26]
Surfacemeasured density
Loss in density per 100°F
rise in average circulating
temperature above surfacemeasured
temperature
Iblgal SP gr iblgai SP gr
8.5 1.020 0.35 0.042
9 1.080 0.29 0.035
10 1.201 0.26 0.031
11 1.321 0.23 0.028
12 1.441 0.20 0.024
13 1.561 0.16 0.019
14 1.681 0.13 0.016
15 1.801 0.12 0.014
Courtesy Baroid Drilling Fluids, Inc.
+60
+40
u"
5 +20
G
CI:
w
a
o
2
p -20
-40
-60
8 9 10 11 12 13 14 l!
DENSITY, ppg
Figure 4-125. Crystallization temperature of various brines [37].
Weight materials commonly used in completion fluids are given in Table 4-70.
Although they add solid particles to the fluid, their use can be economical where
densities exceed 11 .O lb/bbl.
Oil-Base Systems. Oil-base completion and workover fluids contain oil as the
continuous phase. Their application is limited by their density to formations with