According to the number of cones, Tri-cone drill bits can be divided into single-cone drill bits, three-cone drill bits and assembled multi-cone drill bits. According to the cutting material, they can be divided into steel tooth (milling tooth) and tungsten carbide inserts TCI bits.

As a tool for drilling rock formations, roller cone TCI bits have been widely used. Significant improvements in drill bit performance directly reduce drilling costs, especially in the past decade, which has seen the fastest progress. Service life and penetration rate are two performance indicators that ultimately determine the extent to which a drill bit affects drilling costs. Improving the mechanical penetration rate and service life of drill bits is an effective way to reduce drilling costs. Some data confirm that improvements in drill bit speed have a greater impact on reducing drilling costs than improvements in drill bit life. Among them, improvements in drill bit cutting structures are the key to improving the mechanical performance of drill bits. The most direct method for drilling speed. For a long time, people’s improvements in cutting structures have mainly focused on the main cutting tooth structure. For example, in terms of cemented carbide tooth structure, people have successively invented wedge-shaped teeth, spoon-shaped teeth and offset spoon-shaped teeth etc.. People gradually realize that the diameter protection structure also has a great impact on the mechanical penetration rate and life of the drill bit. Especially the drill bits used in highly deviated wells and horizontal wells require reasonable diameter protection structures. Many new diameter protection structures have been researched and developed. Good results have been achieved when applied to roller cone drill bits.

It can be seen from the research and application trends of tri-cone drill bit gauge structures by drill bit manufacturers and research institutions that people gradually realize that the gauge structure has a greater impact on the mechanical penetration rate and life of the drill bit, especially for drill bits used in directional wells and horizontal wells. The impact is even greater. The new drill bit gauge structure researched and developed has achieved good results in the application of roller cone drill bits. The drill bit gauge structure has developed from passive gauge to active gauge, and the gauge material has developed from low wear-resistant materials to high wear-resistant composite materials. The improvement of the drill bit gauge structure and materials has greatly improved the drill bit performance and further improved the drill bit. ROP and life. There is a certain gap in research on gauge structures and materials at home and abroad. Relevant domestic drill bit research institutions and manufacturers should further strengthen research on gauge structures and materials, especially focusing on the research and application of some active gauge structures in drill bits to further improve the quality of domestic drill bits, wheel drill bit performance, providing drilling users with efficient drill bits adapted to new drilling techniques.

The most commonly used bits in oil drilling and geological drilling are roller cone bits. The roller cone bit has the effect of impacting, crushing and shearing the formation rocks when rotating. Therefore, the roller cone bit can adapt to various soft, medium and hard formations. Especially after the emergence of jet roller bits and long nozzle roller bits, the drilling speed of roller bits has been greatly improved, which is a major revolution in the history of roller bit development. According to the type of teeth, roller cone bits can be divided into milling tooth (steel tooth) roller bits, inlaid tooth (carbide teeth are mounted on the gear) roller bits; according to the number of gears, they can be divided into single cone bits, three tooth bits Wheel drill bits and assembled multi-cone wheel drill bits. The most commonly used and common drill bit at home and abroad is the three-cone drill bit.

Main uses of tri-cone drill bits: drilling, exploration, ore mining, oil, drill bits, drilling accessories.