Extended Leak Off Test (XLOT)
The Extended Leak-Off test (XLOT) is a technique used to measure the stress in oil and gas wells and is used to obtain horizontal stress data for predicting wellbore stability. Surface pressure is applied to the fluid column to determine the pressure at which the fracture will propagate into the exposed formation.
XLOT test procedures are similar to routine leak-off tests but with multiple leak-off cycles, longer data collection time, and better data acquisition and analysis.
Stress Caging - An effective wellbore strengthening approach