Page 190 - Formulas and Calculations for Petroleum Engineering

Well test analysis formulas and calculations Chapter 3 183

Formula(s)

m c
gi gi
l ¼
c
m gavg gavg
Reference: Ahmed, T., McKinney, P.D. 2005. Advanced Reservoir Engineering, Gulf Publishing of Elsevier, Chapter: 3,
Page: 256.

3.17 Dimensionless length (linear flow constant rate production/hydraulically
fractured wells)

Input(s)

x: Length of Flow (ft)
L f : Half Length of Fracture (ft)

Output(s)

L D : Dimensionless Length (dimensionless)

Formula(s)

x
L ¼
D
L
f
Reference: Lee, J., Rollins, J. B., & Spivey, J. P. (2003). Pressure Transient Testing (Vol. 9). Richardson, Texas: Society of
Petroleum Engineers, Page: 10.

3.18 Dimensionless length (linear flow/constant-rate production/general case)
Input(s)

x: Fracture Length (ft)
A: Cross Sectional Area (ft)

Output(s)
x D : Dimensionless Length (dimensionless)

Formula(s)
x
x ¼
D
A 0:5
Reference: Lee, J., Rollins, J. B., & Spivey, J. P. (2003). Pressure Transient Testing (Vol. 9). Richardson, Texas: Society of
Petroleum Engineers, Page: 9.

3.19 Dimensionless pressure (linear flow/constant rate production/general case)

Input(s)
p i : Initial Reservoir Pressure (psi)