Stuck Pipe Free Point from Pipe Stretch - Method 1 Calculator
Enter the required inputs, confirm the units, and run the calculator to solve h_f. Review the formula source and assumptions before using the result in engineering work.
Calculation context and source notes
Stuck Pipe Free Point from Pipe Stretch - Method 1 calculates estimated free pipe length for drillstring and rig mechanics workflows in drilling engineering. The page keeps the declared variables, units, source relationship, and output definition visible for technical review.
Use this formula when the listed inputs (OD, ID, S, PF) are known and the assumptions behind the cited drillstring and rig mechanics relationship match the engineering case being checked.
Solves for
h_f (ft)
Best next page
Formula, variables, and sourceFormula, variables, and default calculation
Reproducible default result
With the default values shown below, the calculation returns h_f = 1,977.978064 ft. Defaults demonstrate the implementation; they are not recommended field values.
5
4.276
12
80
Input definitions
OD
inPipe outside diameter
ID
inPipe inside diameter
S
inMeasured pipe stretch
PF
1000 lbDifferential pull force
Output definitions
h_f
Estimated free pipe length
fpc
Free point constant
S
Measured pipe stretch
PF
Differential pull force
OD
Pipe outside diameter
ID
Pipe inside diameter
Engineering use, assumptions, and limits
Use this formula when the listed inputs (OD, ID, S, PF) are known and the assumptions behind the cited drillstring and rig mechanics 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.
Frequently asked questions
What inputs does the Stuck Pipe Free Point from Pipe Stretch - Method 1 calculator need?
The calculation uses Pipe outside diameter (OD), Pipe inside diameter (ID), Measured pipe stretch (S), Differential pull force (PF). Enter values on the units shown beside each field.
What result does this calculator return?
The primary result is estimated free pipe length in ft. The formula section shows the declared relationship, variables, and a reproducible default calculation.
What should I check before using the result?
Confirm the unit basis, source applicability, and input quality. The calculation does not replace a full engineering model or operating procedure. Mixing unit systems without converting the inputs.
Source and record status
Source metadata identifies the relationship implemented by the calculator. Check the cited edition, unit basis, and scope against the engineering case before operational use.
Formulas and Calculations for Drilling, Production and Workover, Lapeyrouse, N.J. (2002)
Lapeyrouse, N.J. 2002. Formulas and Calculations for Drilling, Production and Workover, 2nd Edition, Gulf Professional Publishing, Page 74.
Open source reference