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

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