Drilling EngineeringDrilling Hydraulics
Power Law Flow Behavior Index from Rheometer Readings Formula
Power Law Flow Behavior Index from Rheometer Readings calculates power law flow behavior index for drilling hydraulics workflows in drilling engineering.
How engineers use this formula
Use this formula when the listed inputs (theta_600, theta_300) are known and the assumptions behind the cited drilling hydraulics 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, n equals 0.678087 dimensionless.
theta_600dial units
56
theta_300dial units
35
Inputs
theta_600
dial units600 RPM Rheometer Dial Reading
theta_300
dial units300 RPM Rheometer Dial Reading
Outputs
n
dimensionless
Power Law Flow Behavior Index
theta_600
dial units
600 RPM Rheometer Dial Reading
theta_300
dial units
300 RPM Rheometer Dial Reading
Source and review
reviewedIADC Drilling Manual drilling-fluid processing preview, power-law constants.
Source