Leakoff Test (LOT) & Extended
🔹 **Purpose & Importance**
Leakoff
Test
(XLOT)
✔ Determines fracture pressure & formation integrity
✔ Sets mud weight limits & casing seat depth
✔ Prevents wellbore instability & breakdown
🔹 **Key Parameters & Interpretation**
📌 Leakoff Pressure (LOP) – Deviation from linearity
📌 Breakdown Pressure (FBP) – Fracture initiation
📌 Fracture Gradient – Guides well design
🔹 **Extended Leakoff Test (XLOT)**
📊 Includes fracture reopening & closure analysis
📊 Improves in-situ stress estimation
📊 Useful for hydraulic fracturing & geomechanics