Page 35 - Formulas and Calculations for Petroleum Engineering

28 Formulas and calculations for petroleum engineering

Formula(s)

t bt

t
dbt ¼ k r r g
v
o
364:72 h ø m o
B o
q ¼ 325:86 m q
d o o 0:5
ð k *k Þ
v h h r r g
o
Reference: Horizontal Well Technology, Joshi, Page: 301.
1.61 Horizontal well critical rate correlation—Chaperon

Input(s)

r o : Oil Density (g/cc)
r w : Water Density (g/cc)
x A : Location of a Constant Pressure Boundary (ft)
h: Oil Column Thickness (ft)
m o : Oil Viscosity (cP)
F: F ¼ 5.48 for k v /k h ¼ 1, F ¼ 4.8 for k v /k h ¼ 0.01 and F ¼ 4.16 for k v /k h ¼ 0.01 (mD)
k h : Horizontal Permeability (mD)
L: Horizontal Well Length (m)

Output(s)
3
Q c : Critical Oil Rate (m /h)

Formula(s)

L F
5 2
Q ¼ 3:486 10 h r rð Þ
c w o
x
h
A k m o
Reference: Chaperon, I. 1986. Theoretical Study of Coning Toward Horizontal and Vertical in Anisotropic Formations:
Subcritical and Critical Rates. SPE ATCE, New Orleans, Louisiana.
1.62 Horizontal well critical rate correlations—Efros

Input(s)

r o : Oil Density (g/cc)
r w : Water Density (g/cc)
y e : Half of Horizontal Well Spacing (ft)
h: Oil Column Thickness (ft)
m o : Oil Viscosity (cP)
B o : Oil Formation Volume Factor (RB/STB)
k h : Horizontal Permeability (mD)
L: Length of Reservoir (ft)

Output(s)

q o : Critical Oil Rate (STB/day)