Which of the following indicates successful execution of a Leak-Off Test (LOT)?

The successful execution of a Leak-Off Test (LOT) is indicated by the condition where fluid leakage into the formation is confirmed. During an LOT, pressure is applied to the wellbore until the pressure reaches a level where the formation is expected to allow fluid to exit or "leak off" into it. When this occurs, it signifies that the fracture pressure of the formation has been reached, indicating the integrity and characteristics of the formation at that particular depth.

This leakage provides crucial data about the formation pressure and can help in assessing whether the well is capable of maintaining the necessary pressure control during drilling operations. Understanding the formation's behavior during an LOT is essential for planning subsequent drilling activities and ensuring well stability.

Other scenarios presented, such as no pressure increase or a steady pressure increase, do not indicate a successful test. Instead, they might suggest problems related to equipment or well integrity. The consideration of a uniform weight of mud also does not directly relate to the leak-off test's successful criteria, as this primarily deals with the balance of hydrostatic pressure rather than the assessment of the formation's leakage capacity.