BAKER HUGHES - Drilling Fluids Reference Manual

RESERVOIR APPLICATION FLUIDS
Brine Density, lb/gal Expansion Compressibility
8.4 - 9.0 0.00017 3.8 E-6
9.1 - 11.0 0.00025 1.5 E-6
11.1 - 14.5 0.00033 1.4 E-6
14.6 - 17.0 0.00040 1.4 E-6
17.1 - 19.2 0.00048 1.5 E-6
Table 6 - 7 Brine Density Due to Thermal Expansion
Average Temperature = (BHST + Surface Temperature) ÷ 2
Average Density = Density @ 68°F (20°C) - ((Avg. Temp. – 68°F) × Correction Factor)
Density Correction due to Compression
Hydrostatic Pressure [Bars] = (Depth [m] × Avg. S.G. × 0.0981)
Average Pressure = Bars ÷ 2
Pressure Correction = S.G. + (Avg. Bars × Correction Factor)
Calculations for Density Adjustments
Increase Density for Single Salt Brines
1. Determine weight and volume of system to be weighted.
2. Using the data from the formulation tables, determine the following:
Brine Density lb/gal bbl Water/bbl lb Salt/bbl
D original W o S o
D final W f S f
3. From this data, the required additions can be calculated as follows:
V
Salt additives =
O
( W S − S
O
W
f
f
O
)
Example
where V o = original volume (bbl)
Increase 400 bbl of 9.5 lb/gal CaCl 2 to 10.5 lb/gal CaCl 2 .
BAKER HUGHES DRILLING FLUIDS
REFERENCE MANUAL
REVISION 2006 6-43