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A tricone bit is a mechanical drill bit located in the bottom hole assembly. The bit cuts away the surface of the rock being drilled through rotation and mechanical friction caused by the teeth of the bit. A tricone bit is a drill bit with a head that is divided into three main parts. Tricone bits are designed to take the energy of the rotating drill string and the supply of mud and to apply this force to deepen the well. The tricone bit consists of three rotating cones working inside each other and each with its own row of cutting teeth.
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A polycrystalline diamond compact (PDC) bit is a special type of diamond drilling bit that does not use roller cones, but instead has polycrystalline diamond inserts. PDC bits get their name from the polycrystalline diamond compacts used for their cutting structure. Since their first production in 1976, the popularity of bits using PDC cutters has grown steadily, and they are nearly as common as roller-cone bits in many drilling applications.
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