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268 Formulas and calculations for petroleum engineering
Output(s)
De: Dean Number (dimensionless)
Formula(s)
s ffiffiffiffiffiffiffiffiffiffiffiffiffiffiffiffiffiffiffiffi !
r V d 2 d
De ¼
2 R
m c
Reference: Wikipedia.org.
5.23 Deborah number
Input(s)
t c : Relaxation Time Scale (h)
t p : Time Scale of Observation (h)
Output(s)
De: Deborah Number (dimensionless)
Formula(s)
t c
De ¼
t
p
Reference: Wikipedia.org.
5.24 Decay of thermal neutrons
Input(s)
n 0 : Number of Thermal Neutrons at Time t0 (dimensionless)
t: Time (s)
τ: Thermal Decay Time (s)
Output(s)
n: Number of Thermal Neutrons at Time t (fraction)
Formula(s)
t
n ¼ n exp τ
0
Reference: Bassiouni, Z., 1994, Theory, Measurement, and Interpretation of Well Logs. SPE Textbook Series Vol. 4.
Chapter 9, Page: 180.
