Page 83 - Formulas and Calculations for Petroleum Engineering

76 Formulas and calculations for petroleum engineering

D o : Outer Diameter (ft)
D i : Inner Diameter (ft)
T: Torque (ft lbf)
L: Length of Section (ft)

Output(s)
G: Modulus of Rigidity (psi)
4
J: Polar Moment of Inertia (ft )
y: Angle of Twist (rad)

Formula(s)

E
G ¼
ð
2 1+ uÞ

4 4
3:142 ð D Þ DðÞ
o i
J ¼
32
T L
y ¼
G J
Reference: Samuel. E Robello. 501 Solved Problems and Calculations for Drilling Operations. Sigma Quadrant. 2015.
Houston, Texas, Page: 369.

2.7 Annular capacity between casing and multiple strings of tubing
Input(s)

D i : Inner Diameter of Casing (in.)
T 1 : Diameter of Tubing 1 (in.)
T 2 : Diameter of Tubing 2 (in.)

Output(s)
C a : Annular Capacity (gal/ft)

Formula(s)

2
2

D T +T 2 2
1
i
C ¼
a
1029:4
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: 15.
2.8 Annular capacity between casing and multiple tubing strings
Input(s)

D h : Hole Size (in.)
T a : Outer Diameter of Tubing No.1 (in.)
T b : Outer Diameter of Tubing No.2 (in.)