Junk basket

The drill string is defined here as a drill pipe with tool joints and drill collars. The drill stem consists of the drill string and other components of the drilling assembly that includes the kelly, subs, stabilizers, reamers as well as shock absorbers, and junk baskets or drilling jars used in certain drilling conditions. The drill stem (1) transmits power by rotary motion from the surface to a rock bit, (2) conveys drilling fluid to the rock bit, (3) produces the weight on bit for efficient rock destruction by the bit, and (4) provides control of borehole direction. 

Milling Tool. The milling tool is a common device used for fishing junk. The milling tool is used to grind the junk into small pieces so that the pieces can be circulated to the surface or removed in a junk basket. Figure 4-364 shows the various milling tools that can be used to drill up junk in the bottom of the... 

Junk Basket. The Junk basket is a tool that can be run in conjunction with a milling tool or separately. It is designed to recover the smaller pieces that have been milled or pieces too large to be circulated to the surface. Figure 4-365 shows a typical Junk basket. The Junk basket is placed directly above the milling tool in the string. 

---