Page 236 - Formulas and Calculations for Petroleum Engineering

Production engineering formulas and calculations Chapter 4 229

Formula(s)

L ¼ L 0:5 d ð d Þ
p pc wb ci

Reference: Bell, W. T., Sukup, R. A., & Tariq, S. M. (1995). Perforating. Henry L. Doherty Memorial Fund of AIME, Society
of Petroleum Engineers, Page: 52.

4.59 Perforation penetration ratio (formation of interest/reference formation)

Input(s)
c r : Compressive Strength of reference Formation (ksi)
c: Compressive Strength of Formation of Interest (ksi)

Output(s)

L p : Total Target Penetration in Formation of Interest (in.)
L pr : Total Target Penetration in Reference Formation (in.)

Formula(s)

L
p
¼ exp 0:086 c c:Š
ð
½
r
L
pr
Reference: Bell, W. T., Sukup, R. A., & Tariq, S. M. (1995). Perforating. Henry L. Doherty Memorial Fund of AIME, Society
of Petroleum Engineers, Page: 51.

4.60 Perforation skin factor
Input(s)

s H : Horizontal or Plane Flow Skin (dimensionless)
s v : Vertical or Converging Flow Skin (dimensionless)
s wb : Skin resulted by the Wellbore Effect (dimensionless)
s pd : Skin caused by the Damaged Zone around Perforation (dimensionless)

Output(s)
s p : Perforation Skin (dimensionless)

Formula(s)

s ¼ s + s + s wb + s pd
v
p
H
Reference: Bell, W. T., Sukup, R. A., & Tariq, S. M. (1995). Perforating. Henry L. Doherty Memorial Fund of AIME, Society
of Petroleum Engineers, Page: 65.