Drilling EngineeringDrilling HydraulicsCalculation record

Critical Flow Rate for Flow Regime Change Calculator

Q_c=2.448V_cD_i^2

Enter the declared drilling engineering inputs below to solve Q_c. 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

Q_c=2.448V_cD_i^2

Reproducible default result

With the default values shown below, the calculation returns Q_c = 176.256 gpm. Defaults demonstrate the implementation; they are not recommended field values.

V_cft/s

4.5

D_iin

Input definitions

V_c

ft/s

Critical Velocity

D_i

Pipe Inside Diameter

Output definitions

Q_c

gpm

Critical Flow Rate

V_c

ft/s

Critical Velocity

D_i

Pipe Inside 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

Samuel E. Robello. 501 Solved Problems and Calculations for Drilling Operations. Sigma Quadrant, 2015, Page 220.

Open source reference