Page 217 - Formulas and Calculations for Petroleum Engineering

210 Formulas and calculations for petroleum engineering

Formula(s)

γ ¼ 1 ØÞγ + Ø γ
ð
formation min Liq
Reference: Saydam, T., (1967). Principles of Hydraulic Fracturing, ARI Publishing Co., Page: 5.

4.13 Average upstroke load (sucker-rod pump)

Input(s)
C: Caliberation Constant of Dynamometer (lb/in.)
2
a: Lower Area of Card (in. )
2
A: Area of Upper Card (in. )
L: Length of Dynamometer Card (in.)
Output(s)

AUL: Average Upstroke Load (lb)

Formula(s)

A + a
AUL ¼ C
L
Notes: Calculations Based on Dynamometer Card.

Reference: Boyun, G., William, C., & Ali Ghalambor, G. (2007). Petroleum Production Engineering: A Computer-Assisted
Approach, Page: 18/269.

4.14 Average wellbore fluid density (completion and workover fluids)
Input(s)

ρ m : Measured Ambient (or Surface) Fluid Density (lbm/bbl)
Δρ i : Incremental Wellbore Fluid Density Change (lbm/bbl)
n: Number of Linear Depth intervals (dimensionless)

Output(s)

ρ: Average Wellbore Fluid Density (lbm/bbl)

Formula(s)

" #
n
ð Δρ Þ
X
i
ρ ¼ ρ 1
m
i¼1 n
Reference: Bridges, K. L. (2000). Completion and Workover Fluids (Vol. 19). Society of Petroleum Engineers, Page: 46.
4.15 Capacity ratio of a hydraulically fractured surface

Input(s)
k f : Fracture Permeability (mD)
k: Average Formation Permeability (mD)
h: Formation Thickness (ft)
W: Fracture Thickness (ft)