Page 81 - Formulas and Calculations for Petroleum Engineering

74 Formulas and calculations for petroleum engineering

Output(s)

V: Accumulator Capacity (gallon)

Formula(s)

P P P P
V ¼ BC
P f P S
Reference: Lapeyrouse, N. J., 2002, Formulas and Calculations for Drilling, Production and Workover, Second Edition,
Gulf Professional Publishing, Page: 39.

2.2 Accumulator precharge pressure
Input(s)

V a : Total Accumulator Volume (bbl)
P S : Starting Accumulator Pressure (psi)
V r : Volume of Fluid Removed (bbl)
P f : Final Accumulator Pressure (psi)

Output(s)
P: Accumulator Pressure (psi)

Formula(s)

V r P P s
f
P ¼
V a P P f
s
Reference: Lapeyrouse, N. J., 2002, Formulas and Calculations for Drilling, Production and Workover, Second Edition,
Gulf Professional Publishing, Page: 41.

2.3 Amount of additive required to achieve a required cement slurry density

Input(s)
r: Required Slurry Density (lb/gal)
S Gc : Specific Gravity of Cement (unitless)
C: Water Requirement of Cement (gal/stroke)
A: Water Requirement of Additive (gal/stroke)
S Ga : Specific Gravity of Additive (unitless)

Output(s)
x: Amount of Additive Required (lb/stroke)