Page 173 - Formulas and Calculations for Petroleum Engineering

166 Formulas and calculations for petroleum engineering

2.219 Total number of sacks of tail cement required

Input(s)
N a : Sacks Required by Annulus (unitless)
N c : Sacks Required by Casing (unitless)

Output(s)

N: Total Number of Sacks of Tail Cement Required (unitless)

Formula(s)

N ¼ N +N c
a

Reference: Lapeyrouse, N. J., 2002, Formulas and Calculations for Drilling, Production and Workover, Second Edition,
Gulf Professional Publishing, Page: 55.

2.220 Total water requirement per sack of cement

Input(s)
Q c : Cement Water Requirement Per Sack of Cement (gal/stroke)
Q a : Additive Water Requirement Per Sack of Cement (gal/stroke)

Output(s)
Q w : Total Water Requirement Per Sack of Cement (gal/stroke)

Formula(s)

Q ¼ Q +Q a
c
w
Reference: Lapeyrouse, N. J., 2002, Formulas and Calculations for Drilling, Production and Workover, Second Edition,
Gulf Professional Publishing, Page: 48.

2.221 Triplex pump factor

Input(s)

D L : Piston diameter (in.)
L s : Stroke length (in.)

Output(s)

PF t : Triplex pump factor (bbl/stroke)

Formula(s)

2
3 3:1415 D L s
L
PF ¼
t
4 9702
Reference: 501 Solved Problems and Calculations for Drilling Operations; Page: 48.