Page 101 - Formulas and Calculations for Petroleum Engineering

94 Formulas and calculations for petroleum engineering

2.44 Curvature radius for a borehole

Input(s)
C: Constant Related to the Unit of Borehole Curvature (unitless)
k: Curbature of Wellbore Trajectory (degree/100ft)

Output(s)
R: Curvature Radius of Borehole (ft)

Formula(s)

180 CðÞ
R ¼
3:1415 k

Reference: Samuel. E Robello. 501 Solved Problems and Calculations for Drilling Operations. Sigma Quadrant. 2015.
Houston, Texas, Page: 77.

2.45 Cutting slip velocity

Input(s)
PV: Plastic Viscosity (cP)
MW: Mud Weight (ppg)
Dp: Diameter of Particle (in.)
DenP: Density of Particle (ppg)

Output(s)

V s : Slip Velocity (ft/min)

Formula(s)

0 0 0 1 1 1 0:5

PV B B B 36800 C DenP C C
V ¼ 0:45 B B B C Dp C 1C
C
s B B B 2 1 C +1 C
MW Dp @ @ @ PV A MW A A
MW Dp
Reference: Lapeyrouse, N. J., 2002, Formulas and Calculations for Drilling, Production and Workover, Second Edition
Gulf Professional, Publishing, Page: 176.

2.46 Cuttings produced per foot of hole drilled—bbls

Input(s)
D h : Diameter of Bit or Hole Size (Plus Washout) (in.)
Ø: Porosity (fraction)

Output(s)

V c : Amount of Cuttings Produced per each Foot of Hole Drilled (bbls)