BAKER HUGHES - Drilling Fluids Reference Manual

RESERVOIR APPLICATION FLUIDS
Post H/R (250ºF/121°C) 1.20 SG 1.32 SG 1.44 SG 1.56 SG 1.68 SG 2.24 SG
Fann 600 rpm 36 45 50 60 31 45
Fann 300 rpm 25 27 33 37 20 30
Fann 200 rpm 20 20 25 29 16 24
Fann 100 rpm 14 12 17 18 11 16
Fann 6 rpm 4 3 5 4 4 5
Fann3 rpm 3 2 4 3 3 4
Gels (lbs/100 ft 2 ) 4/4 2/3 4/6 3/5 4/6 4/5
PV (cP) 11 18 17 23 11 15
YP (lbs/100 ft 2 ) 14 9 16 14 9 15
pH 10.2 10.0 10.3 10.8 10.2 11.3
API Filtrate, ml 5.5 5.5 3.2 2.5 3.6 3.4
HT/HP (250F/121°C), ml 22 26 20 19 22 20
Table 6 - 3
Properties of Laboratory Formulations after Hot Rolling
BIO-LOSE ® 90 SYSTEM
Introduction
The BIO-LOSE 90 system was developed by Baker Hughes Drilling Fluids for use as a low solids
horizontal drilling fluid which would provide low dynamic fluid loss and rheological parameters
which are compatible with long horizontal sections. Its primary use is in fractured formations, both
sand and calcareous. The primary viscosifier used is DRISPAC ® , with BIO-LOSE ® added to
control filtration. BIO-LOSE is a non-fermenting chemically modified starch which does not
require any biocides and can be used over a wide pH range in most water-base fluids. The third
product required in the make-up of a BIO-LOSE 90 system is MIL-BREAK 943, which will
prevent any emulsification from occurring as drilling progresses. When mixed according to Baker
Hughes Drilling Fluids guidelines, no further additives will be required.
Rheological Properties
The BIO-LOSE 90 system can easily be adjusted to the operator’s specifications if changes in
rheological properties are required. The Yield Point is usually maintained at 6 to 8 lb/100 ft 2 to
ensure the system will be in turbulent flow.
Filtration Control
Under normal conditions, the API Filtrate ranges from 5.0 to 6.0 cc/30 min. A very tight filter cake
will be formed and laboratory tests have shown the dynamic filtrate to be very low. The
concentration of BIO-LOSE required is 13 to 14 kg/m 3 (6.0 – 6.5 lbm/gal).
BAKER HUGHES DRILLING FLUIDS
REFERENCE MANUAL
REVISION 2006 6-35