Tricone drill bit

Roller bit is the most widely used drilling bit. When the roller bit is working, the cutting teeth alternately contact the bottom of the well, the rock breaking torque is small, the contact area of ​​the cutting teeth and the bottom of the well is small, the specific pressure is high, and it is easy to eat into the formation; the total length of the working edge is relatively large, so the wear is relatively reduced. The roller bit can adapt to a variety of formations from soft to hard. Introduction According to the number of cones, it can be divided into single cone bit, three cone bit and assembled multi cone bit. According to the cutting material, it can be divided into steel teeth (milling teeth) and cog cone drill bits. Roller bits have been widely used as a tool for drilling rock formations. Significant improvements in drill bit performance have directly reduced drilling costs, especially the fastest progress in the past decade. Service life and drilling speed are two performance indicators that ultimately determine the extent to which a drill bit affects drilling costs. Increasing the mechanical drilling speed and service life of the drill bit is an effective way to reduce the cost of drilling. Some data confirm that the improvement of the drilling speed has a greater impact on reducing drilling costs than the improvement of the life of the drill bit. The improvement of the cutting structure of the drill bit is to improve the mechanical performance of the drill bit. The most direct method of drilling speed. For a long time, the improvement of the cutting structure has mainly focused on the main cutting tooth structure. For example, in the cemented carbide tooth structure, people have invented wedge-shaped teeth, spoon-shaped teeth, eccentric spoon-shaped teeth, etc. . People have gradually realized that the diameter-retaining structure also has a greater impact on the mechanical speed and life of the drill bit. Especially for drills used in high-angle and horizontal wells, a reasonable diameter-retaining structure is required. Many new diameter-retaining structures have been researched and developed. Good results have been achieved when applied to roller cone drills.