BAKER HUGHES - Drilling Fluids Reference Manual

BOREHOLE PROBLEMS
Density (lb m /gal)
Un-weighted
10.0
12.0
14.0
16.0
18.0
Base Oil*
(bbl)
70
64
62
57
54
49
BLACK
MAGIC SFT
(sacks)
136
124
113
102
91
81
Water
(bbl)
12
11
7
6
3
3
MIL-BAR ®
(sacks)
0
135
240
345
455
560
* Base Oil: Low-toxicity mineral oil, #2 diesel or synthetic (140°F Aniline Point Minimum)
Table 7 - 8 BLACK MAGIC ® SFT Material Requirements - Formulation per 100 bbl
Mixing Procedure
1. Clean mixing pit and flush pump with water.
2. Add oil as per chart.
3. Add BLACK MAGIC ® SFT through hopper with agitation.
4. Add water and agitate to a smooth blend.
5. Add MIL-BAR and agitate to a smooth blend.
6. To increase viscosity, add BLACK MAGIC ® SFT.
7. To reduce viscosity, add oil.
Recommended Treatment (MIL-SPOT 2)
1. Prior to mixing, thoroughly clean a slug tank with drillwater or seawater and flush out mixing
lines.
2. Fill the slug tank with the required amount of oil as determined from Table 7-9.
3. Add the required amount of MIL-SPOT 2 spotting fluid, followed by the required amount of
seawater or drillwater.
4. Add MIL-BAR to achieve desired fluid weight. All materials can be mixed as fast as required.
5. Barite varies in quality and different barites, especially flotation varieties, can have a marked effect
on rheological properties. Pilot test if barite is poor quality.
BAKER HUGHES DRILLING FLUIDS
REFERENCE MANUAL
REVISION 2006 7-38