Table 2 Velocity error analysis of bottom hole fluid.

From: Mathematical model of velocity and distribution law in gas lift reverse circulation well washing flow field for drilling shaft sinking

Velocity

\(S\)/(m/s)

\(f\)/%

\(v_{t}\)

0.055

10.8

\(v_{r}\)

0.53

19.4

\(v_{s}\)

0.40

27.7

\(v_{a}\)

0.20

16.3

Average value

0.30

18.6