Annular cutting alloy tooth for drilling tool

Abstract

The invention discloses an annular cutting alloy tooth for a drilling tool, which comprises a tooth body and a tooth crown which are integrally shaped; the tooth body is a cylinder or polygonal pillar; the center axial line direction of the tooth body is a vertical direction, and the tooth crown is located at the upper part of the tooth body; diameter of an outer circumferential surface of the tooth crown is gradually reduced until the top part from bottom to top; the center of the top part of the tooth crown is downwards concaved to form a center sink hole. Through arranging the center sink hole at the center of the top part of the tooth crown, the whole alloy tooth forms a dual-cutting-edge annular cutting structure, namely, the inside and outside of the top surface of the tooth crown are provided with annular cutting edges; the repairing and scraping ability of the outside diameter of the drilling tool is enhanced while low drilling tool torque and resistance are guaranteed at the same time; higher drilling efficiency can be acquired and the damage can be effectively reduced; meanwhile, the shortcoming of easily generated stress concentration at the core part of the tooth crownis avoided.

Description

Technical field [0001] The invention relates to a cutting tooth for a drilling tool, in particular to an annular cutting alloy tooth for a drilling tool. Background technique [0002] With the in-depth development of the petroleum, petrochemical and other drilling and production industries, drilling tools are required to drill deeper, more complex formations and more difficult-to-drill rock formations, and drilling companies' demand for drilling efficiency is increasing, which is matched with them. The consumption of carbide teeth used in drilling tools has also greatly increased. Cutting teeth are parts that directly contact the formation rock, which requires high strength, high wear resistance and good impact toughness. Alloy teeth have superior wear resistance and impact toughness, and are widely used in the petroleum drilling industry , The tools used in the machining industry, quarrying, mining, and tunnel engineering have a higher drilling speed than similar products. At ...

AI Technical Summary

Problems solved by technology

[0003] Traditional cemented carbide teeth, no matter flat top teeth, wedge teeth, bevel teeth or bevel spherical teeth, the cutting edge in contact with the cutting rock is the intersection line between the top surface of the tooth and the side of the tooth body as the cutting edge, which has a single form and The cutting edge is short, and because of its small contact area with the well wall, it will generate excessive pressure when cutting rocks, which will easily cause premature wear or even collapse of the carbide teeth, and the service life is short

In addition, the traditional hard alloy teeth are generally press-fitted on the drilling tools by brazing, and the outer surface of the hard alloy teeth is a simple cylindrical surface, which is not conducive to the gas at the bottom of the tooth during the brazing operation. Discharge, reduce the brazing strength, it is easy to cause the cemented carbide teeth to fall off in actual operation, and at the same time, it is easy to generate stress concentration at the core of the tooth. When the alloy tooth is in the cutting operation, the stress release will easily lead to premature damage of the alloy tooth

[0004] The above two reasons are the main reasons why traditional carbide teeth are prone to wear and failure, and are also the main reasons for the low utilization rate and low service life of cemented carbide teeth

Therefore, there is an urgent need to develop a super wear-resistant, high-life cemented carbide tooth to solve the problem of high consumption of cemented carbide teeth in the current market

Images