A button drill bit is extensively use in water wells, HDDs, geothermal drillers and oilfields for drilling hard rock. A button bit offers a number of benefits over a PDC drill bit. Nevertheless, the two most prominent advantages of these bits are highly affordable and have the ability of drilling through dolomite, gravels and very abrasive and hard limestone. It is this quality of the button bits that gives them the ability of withstanding huge impact. Button bits are also known as roller cones as they feature rotating cones containing tungsten carbide inserts. There are Tricones or the three cone bits that are quite popular in the market. But manufacturers are also into making one cone and two cone bits.
Speaking of button bit inserts, there are two classifications in this category. They are conical and chisel. The chisel inserts tend to be more aggressive in comparison to the conical inserts. You can find designs with a mixture of both conical and chisel inserts. It is worth noting that tungsten carbide inserts are manufactured individually and then press fitted into pre-drilled holes in the cones of the button bits. Button bits, when compared to PDC bits, are more beneficial in that they require a small initial investment and their impact is way less damaging on the cutting structure.
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