Page 273 - Formulas and Calculations for Petroleum Engineering

266 Formulas and calculations for petroleum engineering

Formula(s)

4
ð
0
L
p p p Þ R r avg
o ¼
8 m L
Reference: Bird, R.B., Stewart, W.E., and Lightfoot, E.N., (2002). Transport Phenomena (Second ed.). John Wiley & Sons,
Chapter: 2, Page: 53.

5.18 Compton scattering

Input(s)
E 0 : Energy of the Photon Before Scattering (MeV)
m e : Mass of the Electron (kg)
C: Velocity of Light Considered as 3*108 (m/s)
y: Scattering Angle (degree)

Output(s)
E: Energy of the Photon After Scattering (MeV)

Formula(s)

E 0
E ¼
E
1+ 0 1 cos yðÞð Þ
m C 2
e
Reference: Bassiouni, Z., 1994, Theory, Measurement, and Interpretation of Well Logs. SPE Textbook Series Vol. 4.
Chapter 2, Page: 33.

5.19 Correction factor for stagnant film according to the penetration model

Input(s)

ø: Rate Factor (rad)

Output(s)
y: Correction Factor (dimensionless)

Formula(s)

2 !
øðÞ
exp
3:142
y ¼ !
ø
1 + erf
0:5
ð 3:142Þ
Reference: Bird, R.B., Stewart, W.E. and Lightfoot, E.N. (2002). Transport Phenomena (Second Ed.). John Wiley & Sons,
Chapter: 22, Page: 707.