BAKER HUGHES - Drilling Fluids Reference Manual

RESERVOIR APPLICATION FLUIDS
Brine Density lb/gal bbl Water/bbl lb 94% CaCl 2 /bbl lb 95% CaBr 2 /bbl
13.4 .762 149.2 154.5
14.0 .738 134.0 206.1
Water addition = 400 (--------------------------------- 149.2 )(.738)
– .762 = 23.9 bbl
134.0
CaBr 2 addition = 400 ------------------------------------ ( 149.2) ( 206.1)
– ( 154.5)
= 29,
991 lbs
134.0
Final volume = 400 149.2 ------------ = 445 bbl
134.0
Therefore, 400 bbl of 13.4 lb/gal fluid and 23.9 bbl of water and 29,991 bbl of 95% CaBr 2 will
yield 445 bbl of a 14.0 lb/gal fluid.
Increase Density with Heavier Liquid Brine
1. Determine the following:
D o = Original brine density
D h = Density of heavier brine
D f = Final brine density
V o = Original brine volume
2. From this data, the required additions can be calculated as follows:
Volume of heavy brine =
V o ( D h – D
------------------------------- o)
–
D h
D f
Final Volume = V o + volume of heavy brine
Example
Increase 400 bbl of 13.2 lb/gal fluid to 13.7 lb/gal using a 15.1 lb/ gal brine.
D o = 13.2
D h = 15.1
D f = 13.7
V o = 400
Volume of brine to add ( 15.1 ) =
400( 13.7 – 13.2) - = 142.9 bbl
15.1 – 13.7
Final volume = 400 + 142.9 = 542.9 bbl.
BAKER HUGHES DRILLING FLUIDS
REFERENCE MANUAL
REVISION 2006 6-45