Accumulator precharge pressure

Input(s)

$\mathrm{V}_{\mathrm{a}}$: Total Accumulator Volume $(\mathrm{bbl})$

$\mathrm{P}_{\mathrm{S}}$: Starting Accumulator Pressure (psi)

$\mathrm{V}_{\mathrm{r}}$: Volume of Fluid Removed (bbl)

$\mathrm{P}_{\mathrm{f}}$: Final Accumulator Pressure (psi)

Output(s)

P: Accumulator Pressure (psi)

Formula(s)

$$ \mathrm{P}=\frac{\mathrm{V}_{\mathrm{r}}}{\mathrm{V}_{\mathrm{a}}} *\left(\frac{\mathrm{P}_{\mathrm{f}} * \mathrm{P}_{\mathrm{s}}}{\mathrm{P}_{\mathrm{s}}-\mathrm{P}_{\mathrm{f}}}\right) $$

Reference(s)

Lapeyrouse, N. J., 2002, Formulas and Calculations for Drilling, Production and Workover, Second Edition, Gulf Professional Publishing, Page: 41.