دیکشنری تخصصی مهندسی نفت - نسخه آنلاین

n: a downhole tool to enlarge the well diameter as drilling ,with bit in the bottom and erasing knifes driven by fluid pressure in the body

n: refer to drilling -type hole opener

n: a kind hole opener which has cone bits with pilot hole

n: the downhole tools such as drilling pipe ,kelly bar ,casing ,joint,stablizer,hole opener,absorber,bit and so on

n: refer todrilling-type hole opener

n: refer to drilling-type hole opener

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

n: a device used to enlarge the size of an existing borehole. It has teeth arranged on its outside circumference to cut the formation as it rotates.

n: a special drilling tool that can enlarge an existing hole to the required diameter.

a larger device (usually of a fixed diameter) that enlarges the wellbore to a diameter equal to or less than the upper casing drift). Compare to an under-reamer or watermelon mill or string mill.

n: a kind of hole opener

n: a bit placed on a special device called a hole opener that serves to guide the device into an already existing hole that is to be opened (made larger in diameter). The pilot bit merely guides. or pilots. the cutters on the hole opener into the existing hole so that the hole-opening cutters can enlarge the hole to the desired size.

n: the complex bit that made up the bottom center of enlarging bit extends a small bit