BAKER HUGHES - Drilling Fluids Reference Manual

Oil / Synthetic Fluids
Metric Conversions
• CaCl 2 (g/L) = CaCl 2 (lb m /bbl) × 2.85714
• H 2 0 (mL/L) = H 2 0 (gal/bbl) × 23.8086
• CaCl 2 (ppm) = % Wt × 10,000
• Cl – (ppm) = CaCl 2 (ppm) × 0.639
• mg/L = ppm × specific gravity
Formulas
• Salt (lb m /bbl water) = Volume increase factor ×CaCl 2 (lb m /bbl)
• Specific Gravity
1.0036 [0.99707 + 7.923 (10 -3 ) (% wt CaCl 2 ) + 4.964 (10 -5 ) (% wt CaCl 2 ) 2 ]
• Volume Increase Factor *
1.00293 + 1.04192 (10 -3 ) (% wt CaCl 2 ) + 8.94922 (10 -5 ) (% wt CaCl 2 ) 2
• Aw
0.99989 – 1.39359 (10 -3 ) (% wt CaCl 2 ) – 3.50352 (1 0 -4 ) (% wt CaCl 2 ) 2
% wt CaCl 2 = [100% CaCl 2 (lb m /bbl) x % Purity CaCl 2 ]/[S.G. x 350]
When Using CaCl 2 with Purity Other Than 95%.
• New CaCl 2 (lb m /bbl) = 95 ×95% CaCl 2 (lb m /bbl) + % Purity
New H 2 O (gal/bbl) = H 2 O (gal/bbl) – [New CaCl 2 (lb m /bbl) – 95% CaCl 2 (lb m /bbl) / 8.345
Volume increase from salt = 42 + New water **
Example: 35% CaCl2 Brine Using 78% CaCl2
New CaCl 2 (lb m /bbl) = 95 ×172.97 – 78 = 210.67
New H 2 O (gal/bbl) = 35.53 – [(210.67 –172.97) / 8.345] = 31.01
Volume increase from 78% salt = 42 + 31.01 = 1.354
* Volume increase from 100% salt, i.e., from retort.
** Volume increase from salt and water in the sacked salt.
Baker Hughes Drilling Fluids
Reference Manual
5-64 Revised 2006