Development of Caliper Structures for Tricone Drill Bit

Tricone drill bit is a widely used drilling bit. When the roller cone bit works, the cutting teeth contact the bottom of the hole alternately, and the rock breaking torque is small. The contact area between the cutting teeth and the bottom of the hole is small, and the specific pressure is high, and it is easy to eat into the formation. The overall length of the working blade is large, thus relatively reducing wear. Roller cone bits can be used in a wide range of formations from soft to hard.

Ⅰ. The application of caliper structure in three cone bit

In the past ten years, people gradually realize that the caliper structure also has a great influence on the drilling rate and life of bit. Especially, the roller cone bit applied in high-inclination and horizontal wells requires a reasonable caliper structure. Many new caliper structures have been developed and applied to the tricone drill bit and achieved good results.

Ⅱ. Development of caliper structure of three cone bit

As can be seen from the research and application of caliper structure in tricone drill bit manufacturers and research institutions, it is gradually recognized that caliper structure has a great influence on the drilling rate and life of the bit, especially in directional and horizontal wells.

The new type of bit caliper structure developed has achieved good results in the application of roller cone bit.

The roller cone bit caliper structure develops from passive to active caliper. The material develops from low wear resistance material to high wear resistance composite material, and the improvement of the caliper structure and material greatly improves the bit performance, and further improves the drilling rate and life of tricone drill bit.