Weighted cementing calculations
Input(s)
wt: Req. Slurry Density (lb/gal)
\(\mathrm{SG}_{\mathrm{c}}\): Specific Gravity of Cement (fraction)
CW: Water Req of Cement (gal/stroke)
AW: Water Req of Additive (gal/stroke)
\(\mathrm{SG}_{\mathrm{a}}\): Specific Gravity of Additive (fraction)
Output(s)
x: Additive Req. Pounds Per Sack of Cement (lb/stroke)
Formula(s)
\[
\mathrm{x}=\frac{\left(\frac{\mathrm{wt} * 11.207983}{\mathrm{SG}_{\mathrm{c}}}\right)+((\mathrm{wt}) *(\mathrm{CW}))-94-(8.33 *(\mathrm{CW}))}{\left(1+\frac{\mathrm{AW}}{100}\right)-\frac{\mathrm{wt}}{\left(\mathrm{SG}_{\mathrm{a}}\right) * 8.33}-\left(\mathrm{wt}+\frac{\mathrm{AW}}{100}\right)}
\]
Reference(s)
Lapeyrouse, N. J., 2002, Formulas and Calculations for Drilling, Production and Work-over, Second Edition, Gulf Professional Publishing, Page: 47.