Page 153 - Formulas and Calculations for Petroleum Engineering

146 Formulas and calculations for petroleum engineering

Output(s)

PRHP: Polished Rod Horsepower (hp)

Formula(s)

A
PRHP ¼ C S N
33000 12 L

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

2.170 Pore-pressure gradient—Rehm and McClendon
Input(s)

d cn : Normal dc (Modified Bit-Weight exponent in Bingham equation) exponent (dimensionless)
d co : Observed dc (Modified Bit-Weight exponent in Bingham equation) exponent (dimensionless)

Output(s)

g p : Pore Pressure Gradient (psi/ft)

Formula(s)

g ¼ 0:398log d d ÞÞ +0:86
ð
ð
p cn co
Reference: Watson, D., Brittenham, T., & Moore, P. L. (2003). Advanced Well Control (Vol. 10). Society of Petroleum
Engineers, Page: 52.

2.171 Pore-pressure gradient—Zamora
Input(s)

d cn : Normal dc (Modified Bit-Weight exponent in Bingham equation) exponent (dimensionless)
d co : Observed dc (Modified Bit-Weight exponent in Bingham equation) exponent (dimensionless)
g n : Normal Pore Pressure Gradient (psi/ft)

Output(s)
g p : Pore Pressure Gradient (psi/ft)

Formula(s)

d cn
g ¼ g
p n
d
co
Reference: Watson, D., Brittenham, T., & Moore, P. L. (2003). Advanced Well Control (Vol. 10). Society of Petroleum
Engineers, Page: 52.