Page 36 - Formulas and Calculations for Petroleum Engineering

Reservoir engineering formulas and calculations Chapter 1 29

Formula(s)

L
4 2
q ¼ 4:888 10 k h r rð Þ
o h w o 2 0:5 !
2 h
B m 2*y +2*y +
o o e e
3
Reference: Horizontal Well Technology, Joshi, Page: 286–295.

1.63 Horizontal well critical rate correlations—Giger and Karcher

Input(s)

Dr: Specific Gravity Difference (g/cc)
h: Thickness (m)
m: Oil Viscosity (mPa s)
B: Oil Formation Volume Factor (RB/STB)
k h : Horizontal Permeability (mD)
L: Distance Between Lines of Horizontal Wells (m)
2
g: Acceleration of Gravity (m/s )

Output(s)
3
q c : Critical Oil Rate (m /day)

Formula(s)

! !
2
2
h
k h g Dr 1 h
q ¼ 1
c
B m L 6 L
Reference: B.J. Karcher, E.F. Aquitaine, F.M. Giger, Some Practical Formulas to Predict Horizontal Well Behavior.1986.
SPE ATCE, New Orleans, Louisiana.

1.64 Horizontal well critical rate correlations—Joshi method for gas coning
Input(s)

r o : Oil Density (g/cc)
r g : Gas Density (g/cc)
r e : Effective Radius of drainage (ft)
r w : Radius of Wellbore (ft)
l v : Distance between Gas/Oil interphase and perforated top of Vertical Well (ft)
h: Oil Column Thickness (ft)
m o : Oil Viscosity (cP)
B o : Oil Formation Volume Factor (RB/STB)
k h : Horizontal Permeability (mD)

Output(s)

q o : Critical Oil Rate (STB/day)