Question 3274 Deck General

You are correct, the answer to the question is C) hole opener. A hole opener is a device used to enlarge the size of an existing bore hole. It has teeth arranged on its outside circumference that cut the formation as the hole opener rotates, enlarging the diameter of the hole. This is the primary function and purpose of a hole opener tool. The other answer choices are incorrect because: A) A casing opener is used to cut through casing, not enlarge a bore hole. B) A casing bit is used to drill new holes, not enlarge an existing one. D) An enlarger bit is not a standard term, and does not accurately describe the tool in question.