Leak-Off Test Intelligence
ShoeLimit™
LOT Analysis & Decision Support
Created by Nelson Tan
Expected Surface Pressure
-- psi
For a ppg leak-off value: Expected surface pressure = (Leak-off ppg - Mud density ppg) x 0.052 x TVD ft. A psi leak-off value is used directly as surface pressure.
Rapid Pressure Entry
Key pressure → Enter / Next → automatically advance
Point 1
Current Volume
0.0
bbl
First pressure point.
Live LOT Status
WAITING FOR DATA
Enter pressure-volume points. A clean 3-point trend can establish an early provisional baseline.
LOT Decision
Auto detection uses the earliest trustworthy linear trend. A clean 3-point trend can act as a provisional baseline for early leak-off wells; weaker trends require more points. Manual entry always overrides auto.
WAITING FOR DATA
LOT EMW
-- ppg
Estimated LOT Knee
--
A clean 3-point trend can establish an early provisional baseline.
Auto result has not been accepted.
LOT EMW = Mud Density + Leak Off Pressure / (0.052 × TVD ft). WATCH is an early warning only. CONFIRMED is volume-step aware: at 0.10 bbl it requires two subsequent confirming points; at 0.25 bbl it requires one subsequent confirming point to limit unnecessary injection after a suspected deflection. The displayed LOT is an interpolated knee estimate; final operational acceptance remains with the wellsite team.
Max Pressure
-- psi
Recommended LOT
--
Total Pumped
-- bbl
ISIP
-- psi
Pressure / Volume Trend
Pressure is the primary curve. Linear baseline and LOT knee are overlaid. Tap the ΔP legend if you want to show it.
Live LOT plot
Pump Phase
| Volume [bbls] | Pressure [psi] | ΔP [psi] |
|---|
ΔP = Current - Previous Pressure. Red = negative ΔP / leak. Yellow = drop >30%. Trend line shown after Stop Pumping.
Shut-In / Pressure Decline Phase
| Time | Pressure [psi] | Drop [psi/min] |
|---|
Enter shut-in pressures to evaluate cement