Page 106 - Formulas and Calculations for Petroleum Engineering

Drilling engineering formulas and calculations Chapter 2 99

2.56 Directional curvature for a deviated well

Input(s)
∂ Ø: Directional Change (degree)
∂L: Course Length (ft)

Output(s)
DC: Directional Curvature (degree/ft)

Formula(s)

100
DC ¼ ∂ ØÞ
ð
∂L
Reference: Samuel. E Robello. 501 Solved Problems and Calculations for Drilling Operations. Sigma Quadrant. 2015.
Houston, Texas, Page: 84.

2.57 Downward force or weight of casing

Input(s)

W: Casing Weight (lb/ft)
L: Length of Casing (ft)
BF: Buoyancy Factor (unitless)

Output(s)
W d : Downward Force of Casing (lb)

Formula(s)

W ¼ W L BF
d

Reference: Lapeyrouse, N. J., 2002, Formulas and Calculations for Drilling, Production and Workover, Second Edition
Gulf Professional, Publishing, Page: 67.

2.58 Drill pipe or drill collar capacity

Input(s)
ID: Inner Diameter (in.)

Output(s)
C: Drill Collar Capacity (bbl/ft)