Cone bit as a rock-drilling tools have been widely used in drill performance improvements directly reduce the cost of drilling, especially in the past decade most improved.
Two performance indicators of the life and drilling speed, they will eventually determine the extent of the drill bit drilling costs. Increase drilling speed and service life of the drill is an effective way to reduce drilling costs.
The data confirm that the penetration rate improvements to reduce the cost of drilling a greater impact than the improvement of the bit life, including the improvement of the bit cutting structure is the most direct way to improve cone bits ROP.
A long time, the improvement of the cutting structure is mainly concentrated in the main cutting tooth structure, the structure of the carbide teeth; for example, people have invented the wedge-shaped teeth, spoon-shaped teeth, partial top spoon-shaped teeth, wear of tooth.
Over the past decade, people gradually realized that to gage the structure of the drill drilling speed and life have a greater impact, especially in highly deviated and horizontal wells applications drills requires a reasonable gage structure, many new gage structure achieved good results in the study developed and applied to the cone bit.