Annular Velocity Calculator

Annular velocity is the speed of a fluid's movement in a column called an annulus in wells being drilled with circulating drilling fluid.

It is commonly measured in feet per minute (ft/min) or meters per minute (m/min).

Enter your data here: Hole Size (inches): Pipe Size (inches): Hole Size (inches) 12.25 Pipe Size (inches) 4.5 Hole Size (inches) 8.5 Pipe Size (inches) 4.5 Hole Size (inches) 7.5 Pipe Size (inches) 4.5 Hole Size (inches) 6 Pipe Size (inches) 3.5 Hole Size (inches) 5 Pipe Size (inches) 3.5
Flow Rate US GPM Flow Rate MP GPM Flow Rate Ltr/min Ann Vel Ft/min Ann Vel Mtr/min Ann Vel Ft/min Ann Vel Mtr/min Ann Vel Ft/min Ann Vel Mtr/min Ann Vel Ft/min Ann Vel Mtr/min Ann Vel Ft/min Ann Vel Mtr/min Ann Vel Ft/min Ann Vel Mtr/min
50 41.64 189 9 2.9 24 7.2 34 10.4 52 15.7 96 29.3
75 62.46 284 14 4.3 35 10.8 51 15.5 77 23.6 144 43.9
100 83.28 379 19 5.7 47 14.3 68 20.7 103 31.4 192 58.5
125 104.10 473 24 7.2 59 17.9 85 25.9 129 39.3 240 73.1
150 124.92 568 28 8.6 71 21.5 102 31.1 155 47.1 288 87.8
200 166.56 757 38 11.5 94 28.7 136 41.5 206 62.8
225 187.38 852 42 12.9 106 32.3 153 46.6 232 70.7
240.5 200.28 910 45 13.8 113 34.5 164 49.8 248 75.6
275 229.02 1041 52 15.8 129 39.5 187 57.0 283 86.4
300 249.83 1136 57 17.2 141 43.0 204 62.2
400 333.11 1514 75 23.0 188 57.4 272 82.9
500 416.39 1893 94 28.7 235 71.7
600 499.67 2271 113 34.5 282 86.1
700 582.95 2650 132 40.2
800 666.23 3028 151 46.0
900 749.50 3407 170 51.7
1000 832.78 3785 189 57.5
1100 916.06 4164 207 63.2
1200 999.34 4542 226 69.0
1300 1082.62 4921 245 74.7
1400 1165.90 5299 264 80.5
1500 1249.17 5678