Free Point Calculator
When pipe is stuck, a stretch test gives a quick estimate of where it is free before you call wireline. Pull two loads, measure the stretch between them and let the calculator find the free point.
Formulas
Free point
FP (ft) = 735,294 × e (in) × W (lb/ft) / ΔP (lbf)Worked example
GIVEN
- Stretch e = 20 in
- Pipe weight = 19.5 lb/ft
- Differential pull = 40,000 lbf
WORKING
- FP = 735,294 × 20 × 19.5 / 40,000
Free point ≈ 7,169 ft
FAQ
How accurate is a stretch test?
Usually within 10–15%. Hole friction and mixed strings reduce accuracy; confirm with a free-point tool before backing off.
Run it with your well data
Field & Metric units, works offline, save and share results with your crew.
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Reference only. Always verify against your company procedures and well-control certification.