BAKER HUGHES - Drilling Fluids Reference Manual

RESERVOIR APPLICATION FLUIDS
Fluid
Weight
Desired
(lb m /gal
11
12
13
14
15
16
17
18
19
20
Suggested
Funnel
Viscosity
(sec/qt)
45 - 55
50 - 60
55 - 65
55 - 75
60 - 80
65 - 85
75 - 90
75 - 100
75 - 100
75 - 100
Table 6 - 27
Fresh
Water
(bbl)
0.91
0.87
0.82
0.79
0.76
0.72
0.68
0.65
0.61
0.57
Caustic
Soda
(lb)
0.36
0.35
0.33
0.32
0.30
0.29
0.27
0.33
0.43
0.46
MILGEL
(lb)
10.9
9.5
8.3
7.1
6.0
5.0
4.1
3.3
2.5
1.7
CMC (MV)
(lb)
1.82
1.73
1.66
1.58
1.51
1.44
1.37
1.31
1.22
1.15
MIL-BAR
(lb)
145
200
255
310
365
420
475
530
585
640
Formula for Preparing One Barrel of Weighted Freshwater
Packer Fluid Using MILGEL and CMC (MV)
Conversion of CARBO-DRILL Fluids to a Packer Fluid
The CARBO-DRILL ® oil-base fluid system will make an excellent packer fluid with minor
conditioning. Since oil-base fluids are electrical insulators, corrosion will be minimal in the
CARBO-DRILL system. The CARBO-DRILL system is also significantly more temperature
stable than water-base fluids. In addition, the CARBO-DRILL system environment is not
conducive to bacterial growth.
When using the CARBO-DRILL system as a packer fluid, it should be treated with approximately
0.25 gal/bbl of CARBO-MUL ® HT for added temperature and emulsion stability. If the
bottomhole temperature exceeds 350°F, 0.25 to 0.50 gal/bbl of CARBO-TEC TM and the
appropriate amount of lime should also be added.
The CARBO-DRILL system used must have adequate yield point and gel strengths to support
barite and drill solids for long periods of time. Enough CARBO-GEL ® should be added to provide
a 25 to 40 lb f /100 ft 2 yield point. Be sure the newly added CARBO-GEL has had adequate shear
through the bit to insure maximum yield. Pilot testing is very useful in estimating the amount of
CARBO-GEL needed.
If there is a chance of CO 2 or H 2 S intrusion, enough lime should be added to provide for 4 to 6
lb m /bbl excess lime. If H 2 S is expected, a hydrogen sulfide scavenger (MIL-GARD ® ) can also be
added.
SOFTWARE FOR COMPLETIONS AND WORKOVERS
Baker Hughes Drilling Fluids has developed software specifically for use on completion and
workover operations. This software is designed for use during the planning and operations phases
of these operations.
BAKER HUGHES DRILLING FLUIDS
REFERENCE MANUAL
REVISION 2006 6-104