Page 136 - Formulas and Calculations for Petroleum Engineering

Drilling engineering formulas and calculations Chapter 2 129

2.127 Lateral load imposed on a casing centralizer—Cementing

Input(s)
m: Steel in Mud Buoyancy Factor (dimensionless)
W: Weight per foot of Casing (lbm)
L: Distance from Centralizer to next Lower Centralizer (ft)
y: Borehole Angle (degree)
T: Tension (Pulling Force) due to casing below Centralizer (lbm)
d: One-half the change in Angle between Centralizer and next Lower Centralizer (degrees)

Output(s)
F L : Lateral Load, Casing Weight Component Tension Component (lbm)

Formula(s)

L
F ¼ m W L siny 2 TðÞsind
Reference: Suman Jr, G. O., & Ellis, R. C. (1977). Cementing handbook. World Oil, Page: 44.

2.128 Lateral load imposed on a casing centralizer with a dogleg—Cementing
Input(s)

m: Steel in Mud Buoyancy Factor (dimensionless)
W: Weight per foot of Casing (lbm)
L: Distance from Centralizer to next Lower Centralizer (ft)
y: Borehole Angle (degree)
T: Tension (Pulling Force) due to casing below Centralizer (lbm)
d: One-half the change in Angle between Centralizer and next Lower Centralizer (degrees/100 ft)

Output(s)
F L : Lateral Load, Casing Weight Component Tension Component (lbm)

Formula(s)

L
F ¼ m W L siny 2 TðÞsind
degrees

Dogleg Spacing ftðÞ
100ft
d ¼
200
X
T ¼ m W L cosy
Reference: Suman Jr, G. O., & Ellis, R. C. (1977). Cementing handbook. World Oil, Page: 44.

2.129 Linear annular capacity of pipe

Input(s)
D h : Inside Diameter of Casing Against the Pipe (in.)
D o : Outside Diameter of Pipe (in.)