دیکشنری تخصصی مهندسی نفت - نسخه آنلاین

n: a kind of enlarger equipped with Scalable erasing knifes

n: refer todrilling-type hole opener

n: refer to drilling-type hole opener

n: a tool used to enlarge the diameter of bare hole under the casing
and it shrinks when descent down hole while extendes under the fluid pressure and shrinks again when stop the pump

n: a tool that open hole through casing under the control of hydraulic pressure.

n: a device used to underream. See underream.

n: The tool that be used to enlarge the diameter of borehole for tripping in casing easily.