Question 3258 Deck General

The correct answer is C) Leak-off. The leak-off test is used to determine the pressure at which the formation immediately below the last set casing will take fluid. This test is conducted to establish the maximum pressure that can be safely applied to the well, which is an important safety consideration during drilling operations. The other answer choices are not correct because: A) Drill stem tests are used to evaluate the production potential of a formation, not the pressure at which it will take fluid; B) Conductor casing is the largest casing set in the well, not the pressure below the last set casing; and D) Production testing is done to evaluate the long-term production capabilities of a well, not the immediate pressure response of the formation.