Drilling EngineeringDrilling HydraulicsCalculation record

Annular Capacity - gal/ft Calculator

AC_{gal}=\frac{D_h^2-D_p^2}{24.51}

Enter the declared drilling engineering inputs below to solve AC_gal. Variable definitions, units, the default calculation, and the available source trail are included on this page.

Tabular solver

Extended guidance in preparation

What is available in this record

This record provides the functioning calculator, formula, declared variables and units, a reproducible default result, and the available citation metadata. A separately written engineering interpretation has not yet been published for this calculation.

Formula reference

Formula, variables, and default calculation

AC_{gal}=\frac{D_h^2-D_p^2}{24.51}

Reproducible default result

With the default values shown below, the calculation returns AC_gal = 1.927785 gal/ft. Defaults demonstrate the implementation; they are not recommended field values.

D_hin

8.5

D_pin

Input definitions

D_h

Hole or Casing Inside Diameter

D_p

Pipe Outside Diameter

Output definitions

AC_gal

gal/ft

Annular Capacity

D_h

Hole or Casing Inside Diameter

D_p

Pipe Outside Diameter

Source and record status

Source metadata identifies the relationship implemented by the calculator. Check the cited edition, unit basis, and scope against the engineering case before operational use.

reviewed

Lapeyrouse, N.J. 2002. Formulas and Calculations for Drilling, Production and Workover, 2nd Edition, Page 12.

Open source reference