Page 96 - Formulas and Calculations for Petroleum Engineering

Drilling engineering formulas and calculations Chapter 2 89

Output(s)

dr s(CO 2 ) : CO2 Solubility in Oil and Oil-Mud Emulsifiers (SCF/bbl)

Formula(s)

p
c
dr ¼
ð
aT
sCO 2 Þ b
Reference: Watson, D., Brittenham, T., & Moore, P. L. (2003). Advanced Well Control (Vol. 10). Society of Petroleum
Engineers, Page: 16.

2.34 Combined solubility—Hydrocarbon gas, CO , and H S—in each of
2
2
the mud components
Input(s)

f h : Mole Fraction of Hydrocarbon Gas (dimensionless)
: Mole Fraction of Carbon Dioxide (dimensionless)
f CO 2
f H 2 S : Mole Fraction of Hydrogen Sulphure (dimensionless)
r sh : Solubility of Hydrocarbon Gas (SCF/bbl)
: Solubility of Carbon Dioxide (SCF/bbl)
r sCO 2
r sH 2 S : Solubility of Hydrogen Sulphure (SCF/bbl)

Output(s)
dr s(o,w,e) : Combined Solubility of Hydrocarbon Gas, CO 2 and H 2 S (SCF/bbl)

Formula(s)

r ¼ f r + f r + f r
ð
so, eÞ h sh CO 2 sCO 2 H 2 S sH 2 S
Reference: Watson, D., Brittenham, T., & Moore, P. L. (2003). Advanced Well Control (Vol. 10). Society of Petroleum
Engineers, Page: 16.

2.35 Control drilling—Maximum drilling rate
Input(s)

q: Circulation Rate (gpm)
D h : Hole Diameter (in.)
MW o : Mud Wt. out (ppg)
MW i : Mud Wt. in (ppg)

Output(s)

MDR: Maximum Drilling Rate (ft/h)