Drilling EngineeringDrilling Operations and Economics
Rotating Horsepower from Torque and Speed Formula
Rotating Horsepower from Torque and Speed calculates rotating horsepower for drilling operations and economics workflows in drilling engineering.
How engineers use this formula
Use this formula when the listed inputs (T, N) are known and the assumptions behind the cited drilling operations and economics relationship match the engineering case being checked.
Assumptions
- Input values are representative for the well, reservoir, fluid, or equipment case being evaluated.
- The declared units match the field-unit constants used in the formula.
- The cited formula applies to the selected petroleum engineering workflow.
Limitations
- The calculation does not replace a full engineering model or operating procedure.
- Accuracy depends on the source correlation, assumptions, input quality, and unit consistency.
Common mistakes
- Mixing unit systems without converting the inputs.
- Using default example values as field recommendations.
- Applying the formula outside the source assumptions.
Default example
Using the default inputs, RHP equals 114.242193 hp.
Tft*lbf
5000
Nrev/min
120
Inputs
T
ft*lbfRotary torque
N
rev/minRotary speed
Outputs
RHP
hp
Rotating horsepower
T
ft*lbf
Rotary torque
N
rev/min
Rotary speed
Source and review
reviewed501 Solved Problems and Calculations for Drilling Operations, Robello, S.E. (2015)
Samuel, E. Robello. 501 Solved Problems and Calculations for Drilling Operations, Sigma Quadrant, Houston, Texas, 2015, Page 46.
Source