Uphole Velocity Calculator

Formula

The formula to calculate the Uphole Velocity (UHV) is:

\[ UHV = \frac{183.4 \times CFM}{HD^2 - PD^2} \]

Where:

Uphole Velocity (UHV): The linear speed of flow in the uphole portion of a drilling operation.
Flow Rate Uphole (CFM): The volume of fluid flowing per minute in the uphole direction.
Hole Diameter (HD): The diameter of the hole being drilled.
Pipe Diameter (PD): The diameter of the pipe used in the drilling operation.

Let's say the flow rate uphole (CFM) is 500 ft³/min, the hole diameter (HD) is 10 inches, and the pipe diameter (PD) is 5 inches. Using the formula:

\[ UHV = \frac{183.4 \times 500}{10^2 - 5^2} = \frac{91700}{75} = 1222.67 \text{ ft/s} \]

So, the uphole velocity is approximately 1222.67 ft/s.