Page 144 - Formulas and Calculations for Petroleum Engineering
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Drilling engineering formulas and calculations Chapter 2 137
Formula(s)
n
ð
τ ¼ K g Þ
Reference: Samuel. E Robello. 501 Solved Problems and Calculations for Drilling Operations. Sigma Quadrant. 2015.
Houston, Texas, Page: 184.
2.148 Mud rheology calculations—Bingham plastic model
Input(s)
2
τ y : Yield Stress (lb/100 ft )
m p : Bingham Plastic Viscosity (cP)
g: Shear Rate (1/s)
Output(s)
2
τ: Shear Stress (lb/100 ft )
Formula(s)
p
y
τ ¼ τ + m g
Reference: Samuel. E Robello. 501 Solved Problems and Calculations for Drilling Operations. Sigma Quadrant. 2015.
Houston, Texas, Page: 185.
2.149 Mud weight increase required to balance pressure
Input(s)
F: Differential Force (lb)
2
A: Area Below Casing Shoe (in. )
L c : Casing Length (ft)
Output(s)
W m : Mud Weight increase Required (ppg)
Formula(s)
F
W ¼
m
A 0:052 L
c
Reference: Lapeyrouse, N. J., 2002, Formulas and Calculations for Drilling, Production and Workover, Second Edition,
Gulf Professional Publishing, Page: 67.
2.150 Mud weight reduction by dilution—Water/diesel/any liquid
Input(s)
W 2 : Required mud density (ppg)
W 1 : Initial Mud density (ppg)
V m : Initial Mud Volume (bbl)
D w : Water/Diesel density (ppg)
