Definition(s)
Leak-Off Test
Application of pressure by superimposing a surface pressure on a fluid column in order to determine the pressure at which the exposed formation accepts whole fluid.
Source: ISO 16530-1:2017, Petroleum and natural gas industries — Well integrity – Part 1: Life cycle governance, First Edition, March 2017. Global Standards
Source: API RP 59, Recommended Practice for Well Control Operations, Second Edition, May 2006. Global Standards
Leak-Off Test (LOT)
A leak-off test is a procedure used to determine the wellbore pressure required to initiate a fracture in the open or exposed formations.
Source: API STD 65 – Part 2, Isolating Potential Flow Zones During Well Construction, Upstream Segment, Second Edition, December 2010. Global Standards