API Thread Tricone Roller Drill Bits Used In Oil Drilling And Geological Drilling

API Thread Tricone Roller Drill Bits Used In Oil Drilling And Geological Drilling

Discriptions:
 

Tricone bit is the most widely used type of drilling bit. When the roller bit is working, the cutting teeth alternately contact the bottom of the well, the breaking torque is small, and the contact area between the cutting tooth and the bottom of the hole is small, which is higher than the pressure and easy to eat into the formation. The total working length is relatively large, thereby reducing the wear. Tricone bit can adapt to a variety of formations from soft to hard.

 

Introduction:
According to the number of roller cone can be divided into single cone bit, three roller cone bits and assembly of multi-cone bit. According to the cutting material can be divided into steel teeth (milling teeth) and indented roller cone bit.

As a tool for drilling rock formations, roller cone bits have been widely used. Significant improvements in bit performance directly reduce drilling costs, especially in the recent decade. Life expectancy and penetration rate of two performance indicators, they ultimately determine the extent of drilling costs impact drilling. Increasing the penetration rate and service life of the drill bit is an effective way to reduce the drilling cost. It is confirmed that the improvement of the drilling rate has a greater impact on reducing the drilling cost than the improvement of the drill bit life, in which the improvement of the drill cutting structure is to improve the drilling machine The most direct method of drilling speed. For a long time, the improvement of the cutting structure mainly focused on the main cutting tooth structure, for example, in the cemented carbide tooth structure, people have invented wedge teeth, spoon-shaped teeth, partial top spoon-shaped teeth, such as wear gear and so on . It is gradually realized that the gauge structure also has a great influence on the bit penetration rate and life span of the bit. In particular, the bit used in high-grade and horizontal wells requires a reasonable gauge structure. Many new gauge structures have been developed Apply to the roller bit has achieved good results.

From the bit manufacturers and research institutes in the tri-cone bit holder structure research and application of dynamic can be seen, it is gradually realized that the gauge structure on the bit penetration rate and life have a greater impact, especially in the application of directional drilling and horizontal well bit A greater impact, research and development of the new gage structure has been applied in the roller cone obtained good results. Drill gauge structure from the passive gauge to the active gauge, gauge material from low wear-resistant materials to high wear-resistant composite materials, bit diameter and structure of the material improvements greatly improved the performance of the drill to further improve the bit ROP and life. At home and abroad, there is a certain gap in the research on the structure and materials of the protective gauze. The relevant domestic research institutes and manufacturers of drill bits should further strengthen their research on the structure and materials of the gauge guns. In particular, they should pay more attention to the research and application of some active gauge structures in the drill bit, Wheel drill performance, to provide drilling users to adapt to new drilling technology efficient drilling bit.

Drill bits are the most widely used in oil drilling and geological drilling. Tricone bits have the effect of rocking, crushing and shearing the formation rock during rotation. Therefore, the roller cone bit can adapt to various soft, medium and hard formations. Especially after the emergence of jet-type roller bits and long-nozzle roller cone bits, the roller bit drilling speed is greatly increased, which is a major revolution in the development of roller cone bits. Tricone bit by tooth type can be divided into milling teeth (steel teeth) roller bit, insert the tooth (carbide roller gear set) roller bit; according to the number of roller cone can be divided into single-cone bit, three teeth Drill bit and assembly of multi-cone bit. The most widely used at home and abroad, the most common is the tricone bit.

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