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Structure and working principle of rib drill pipe

发布时间：

2022-04-07

1. The structure of the rib drill pipe

Rib drill rod is mainly composed of rod body and rib sheet. On a core tube similar to the flat drill pipe, a high-hardness blade with a certain width (generally about 18mm) and a certain height (generally about 7mm) is spirally welded. consistent, as shown in Figure 2. Figure 2 Main specifications of rib drill pipe: Φ50—Φ63.5, Φ63.5—Φ73, Φ73—Φ89

Example: Rib drill pipe Φ73-Φ89 means that the diameter of the drill pipe body is Φ73mm, and the outer diameter of the rib piece (ie the outer diameter of the drill pipe) is Φ89mm.

Second, the working principle of the rib drill pipe

The outer diameter of the rib piece of the rib drill pipe is the same as that of the flat drill pipe, which is in line with the specifications of the drill holder, and the rib piece has a certain width and strength. Drilling in harder formations.

The rib piece of the rib drill pipe is of helical structure, which ensures that there is sufficient clearance between the drill pipe and the borehole, and is conducive to the formation of a circulation channel between the orifice and the bottom of the hole. During drilling, the flushing fluid or compressed air is transported to the bottom of the hole through the central hole of the drill pipe body, and then carries the broken cuttings at the bottom of the hole to the outside of the hole along the spiral groove between the hole wall and the outer surface of the drill pipe. , has the same slag discharge effect as the twist drill pipe, and is suitable for drilling in softer formations.
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