Page 164 - Formulas and Calculations for Petroleum Engineering

Drilling engineering formulas and calculations Chapter 2 157

2.198 Solids analysis low-salt content muds

Input(s)
C Cl : Concentration of Chlorine (ppm)
P vw : Percentage by vol of water (percent)
P vo : Percentage by vol of oil (percent)
S: CEC of shale (lb/bbl)
M: CEC of Mud (lb/bbl)
mw: Mud Weight (ppg)

Output(s)
SW: Percentage by vol of salt water (percent)
SS: Percentage by vol of suspended solids (percent)
ASG sw : Average specific gravity of salt water (fraction)
ASG: Average specific gravity of solids (fraction)
LGS: Percentage by volume of low gravity solids (% by vol)
P b : Pounds per barrel of barite (% by vol)
P be : Percentage of Bentonite (lb/bbl)
P ds : Percentage of Drilled Solids (lb/bbl)

Formula(s)

8 1:2
SW ¼ 5:88 10 C +1 P
Cl vw
SS ¼ 100 P SW
vo

0:95 6
ASG ¼ C 1:94 10 +1
sw Cl

ð 12 mwÞ SW ASG sw 0:84 P vo
ASG ¼
SS
4:2 ASG
LGS ¼ SS
1:6
P ¼ SS LGSð Þ 14:71
b

S LGS
ð M 9Þ
65 S
1
65
P ¼
be
9:1

P ¼ LGS P be 9:1
ds
Reference: Formulas and Calculations for Drilling, Production and Workover, Second Edition, Lapeyrouse, Page: 92.
2.199 Spacer volume behind slurry required to balance the plug

Input(s)
C a : Annular Capacity (ft/bbl)
E: Excess Volume (fraction)
V a : Spacer Volume Ahead (bbl)
C p : Capacity of Pipe or Tubing (bbl/ft)