Page 91 - Formulas and Calculations for Petroleum Engineering

84 Formulas and calculations for petroleum engineering

Output(s)

3
SG c : Specific Gravity (Average Bulk Density) of Cuttings (gm/cm )
Formula(s)

1
SG ¼
c
2 0:12 W Þ
ð
r
Reference: Lyons, W. C., Carter, T., and Lapeyrouse, N. J., 2012, Formulas and Calculations for Drilling, Production and
Workover, Third Edition, Gulf Professional Publishing, Page: 21.
2.24 Bulk modulus using Poisson’s ratio and Young’s modulus

Input(s)
2
E: Young’s Modulus (N/m )
m: Poisson’s Ratio (dimensionless)

Output(s)

2
K: Bulk Modulus (N/m )
Formula(s)

E
K ¼
3 1 2 mÞ
ð

Reference: Bassiouni, Z., 1994, Theory, Measurement, and Interpretation of Well Logs. SPE Textbook Series Vol. 4.
Chapter 3, Page: 46.

2.25 Buoyancy weight
Input(s)

r m : Density of Mud (ppg)
r s : Density of Pipe Material (ppg)
d: Depth (ft)
m: Weight (ppf)

Output(s)

B: Buoyancy Factor (fraction)
W: Buoyancy Weight (lbf)

Formula(s)

r m
B ¼ 1
r s
W ¼ B m d

Reference: Lapeyrouse, N. J., 2002, Formulas and Calculations for Drilling, Production and Workover, Second Edition,
Gulf Professional Publishing, Page: 20.