Double-layer barrel type drilling tool

Abstract

The invention discloses a double-layer cylindrical drilling tool, which comprises a connecting part, an inner cylinder body, an outer cylinder body and a plurality of cutting tools. The upper end part of the inner cylinder body is fixedly connected with the connecting part; the outer cylinder body is nested at the outer side of the inner cylinder body, and an annular cavity is formed between the inner cylindrical surface of the outer cylinder body and the outer cylindrical surface of the inner cylinder body; the upper end part of the outer cylinder body is fixedly connected with the connecting part; the plurality of cutting tools are respectively fixedly arranged on the lower edges of the inner cylinder body and the outer cylinder body; and a plurality of guiding strips which present spiral elevating status along the cylindrical surface of the cylinder body are respectively arranged on the inner cylinder body and the outer cylinder body. The space used for carrying boring mud in the double-layer cylindrical drilling tool is divided into two parts, namely the inner cavity of the inner cylinder body and an annular space formed between the inner cylinder body and the outer cylinder body, thereby being favorable for carrying hard boring mud particles, greatly enhancing the mud carrying capability of the drilling tool, further effectively avoiding the accidents of drill pipe sticking and the like and enhancing the drilling efficiency and the hole forming speed.

Description

technical field [0001] The invention relates to a drilling tool for hole forming, in particular to a barrel drilling tool. Background technique [0002] It is very important to choose suitable drilling tools during rotary drilling construction. It plays an important role in reducing the consumption of drilling tools itself, saving energy, improving the speed and quality of hole formation, and improving the overall construction efficiency. [0003] For drilling conditions such as gravel or pebble formations, conical auger drilling tools or barrel drilling tools can be used. In the actual construction process, the above two kinds of drilling tools all have problems that affect the quality or efficiency of hole formation. Among them, the use of conical auger bits cannot achieve ideal guidance during the drilling process, and the hole will be inclined, which will affect the quality of the hole; in addition, the use of conical auger bits cannot effectively carry the drilling sla...

AI Technical Summary

Problems solved by technology

In the actual construction process, the above two kinds of drilling tools have problems that affect the quality or efficiency of hole formation

Among them, the use of the conical auger bit in the drilling process cannot achieve ideal guidance, and the hole will be inclined, which will affect the quality of the hole; in addition, the use of the conical auger bit cannot effectively carry the drilling slag, and part of the drilling slag stays at the bottom of the hole, affecting the result. Pore ​​efficiency

Among them, the use of the existing barrel drilling tools can overcome the guiding problem of the conical helical drill bit in construction, but due to the large inner cavity of the barrel and the low adhesion between drilling slags determined by the characteristics of the formation, it is difficult to Part of the drilling slag remains at the bottom of the hole, and the existing barrel drilling tools cannot effectively carry the drilling slag. As the drilling tool continues to drill, accidents such as drill sticking are prone to occur, and the drilling efficiency is low

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