Drilling EngineeringDrilling HydraulicsCalculation record

Annular Capacity Between Casing and Multiple Strings of Tubing Calculator

C_a=\frac{D_i^2-(T_1^2+T_2^2)}{1029.4}

Enter the declared drilling engineering inputs below to solve C_a. 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

C_a=\frac{D_i^2-(T_1^2+T_2^2)}{1029.4}

Reproducible default result

With the default values shown below, the calculation returns C_a = 0.034091 bbl/ft. Defaults demonstrate the implementation; they are not recommended field values.

D_iin

T_1in

2.875

T_2in

2.375

Input definitions

D_i

Casing or Hole Inside Diameter

T_1

Tubing String 1 Outside Diameter

T_2

Tubing String 2 Outside Diameter

Output definitions

C_a

bbl/ft

Annular Capacity

D_i

Casing or Hole Inside Diameter

T_1

Tubing String 1 Outside Diameter

T_2

Tubing String 2 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

Formulas and Calculations for Drilling, Production and Workover, Lyons, W.C., Carter, T., Lapeyrouse, N.J. (2012)

Lyons, W.C., Carter, T., and Lapeyrouse, N.J. 2012. Formulas and Calculations for Drilling, Production and Workover, 3rd Edition, Gulf Professional Publishing, Page 15.

source conflict

Open source reference