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STANDARD HANDBOOK OF PETROLEUM & NATURAL GAS ...

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664 Drilling and Well Completions<br />

60<br />

OIL MUD SALT SATURATION CURVES FOR SODIUM<br />

AND CALCIUM CHLORIDE COMBINATIONS<br />

50<br />

-0<br />

E'<br />

.c<br />

0<br />

B<br />

&? 40<br />

0<br />

W"<br />

e<br />

[r<br />

3<br />

6 30<br />

5<br />

n<br />

$<br />

20<br />

10<br />

30 40 50 60 70 80 90 100<br />

lo 1" CALCIUM CHLORIDE, Ib/bbl of mud<br />

Figure 4-109. Solubility chart for calcium and sodium chloride brines [26].<br />

(Courtesy Baroid Drilling Fluids, lnc.)<br />

Water-Base Mud Systems<br />

Bentonite Mud<br />

Drilling Fluids: Composition and Applications<br />

The bentonite muds include most types of freshwater muds. Bentonite is added<br />

to water-base muds to increase viscosity and gel strength, and also to improve

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