BAKER HUGHES - Drilling Fluids Reference Manual

Baker Hughes Drilling Fluids
CARBO-TROL ®
CARBO-TROL ® is a blend of high molecular weight organic polymers and inorganic bridging agents
used to improve filtration control in oil-base fluid systems. CARBO-TROL will have a minimal
rheological effect on the drilling fluid. CARBO-TROL is compatible with most synthetic and oil-base
fluid systems.
Treatments of CARBO-TROL will vary with the type of oil being used, temperatures to be
encountered, and desired filtration control properties. Pilot testing is recommended to determine
optimum concentration. Treatment levels of 2 to 10 lb m /bbl (5.7 to 28.5 kg/m 3 ) should be adequate
for most applications.
Table 5-12 Typical Physical Properties – CARBO-TROL
Appearance
Gray powder
Hygroscopic
pH in H 2 O
No
Neutral
Bulk Density 49 lbm/ft 3 (784 kg/m 3 )
CARBO-TROL ® HT
CARBO-TROL ® HT is a high-temperature softening-point gilsonite used to improve filtration control
in the CARBO-DRILL and CARBO-CORE (no water) oil-base fluid systems with minimal effects on
rheological properties.
Treatments of 2.0 to 10 lb/bbl (5.7 to 28.5 kg/m 3 ) is adequate for most applications. Example: A
425°F (218°C) CARBO-DRILL formulation treated with 5 lb m /bbl (14.3 kg/m 3 ) CARBO-TROL HT
results in the reduction of the 350°F (177°C) HT/HP filtrate from 10.0 to 6.0 cm 3 .
Table 5-13 Typical Physical Properties – CARBO-TROL HT
Appearance
Black powder
Hygroscopic
No
Bulk Density 115 lbm/ft 3 (1040 kg/m 3 )
Baker Hughes Drilling Fluids
Reference Manual
Revised 2006 5-35