Annular capacity between casing and multiple tubing strings
Input(s)
\(\mathrm{D}_{\mathrm{h}}\): Hole Size (in.)
\(\mathrm{T}_{\mathrm{a}}\): Outer Diameter of Tubing No. 1 (in.)
\(\mathrm{T}_{\mathrm{b}}\): Outer Diameter of Tubing No. 2 (in.)
Output(s)
AC: Annular Capacity (gal/ft)
Formula(s)
\[
A C=\frac{D_{h}^{2}-\left(T_{a}^{2}+T_{b}^{2}\right)}{1029.4}
\]
Reference(s)
Lapeyrouse, N. J., 2002, Formulas and Calculations for Drilling, Production and Workover, Second Edition, Gulf Professional Publishing, Page: 14.