BAKER HUGHES - Drilling Fluids Reference Manual

Oil / Synthetic Fluids
CARBO-VIS
CARBO-VIS is an high-yielding organophilic bentonite clay used as the viscosifying and
suspending agent in oil- and synthetic-base fluid systems. It increases the carrying capacity and hole
cleaning characteristics of oil and synthetic-base fluids by imparting viscosity and gel building
characteristics to diesel oil, crude oil, mineral oil, and synthetic fluids. CARBO-VIS can be used to
condition CARBO-DRILL or other oil-base fluid systems for use as packer fluids. Concentrations of
1 to 5 lb m /bbl (2.85 to 14.3 kg/m 3 ) are usually adequate for most uses. Good shear is recommended
for proper blending.
Table 5-14 Typical Physical Properties – CARBO-VIS
Appearance
Tan powder
Hygroscopic
pH in H 2 O
No
n/a
Bulk Density 42 lbm/ft 3 (672 kg/m 3 )
CHEK-LOSS ®
CHEK-LOSS ® is a water-insoluble, ultra-fine, complexed cellulosic material used for controlling
seepage and loss of circulation while drilling through depleted or under-pressured zones. CHEK-
LOSS can be maintained in a circulating system without bypassing the shale shakers. CHEK-LOSS is
effective in bridging micro fractured and permeable formations to control seepage loss.
Table 5-15 Typical Physical Properties – CHEK-LOSS
Appearance
Brown powder
Hygroscopic
No
pH in H 2 O 3.5
Baker Hughes Drilling Fluids
Reference Manual
5-36 Revised 2006