Cutting structure including cone and teeth. Cone is a on which (or milled) tooth cone, divided in two single cone complex cone and single cone from the main cone and back cone consisting of a single cone cone in Wells bottom is pure rolling motion for hard formation drilling. complex by the main cone Cone, vice cone and back cone of three parts, which in addition to the cone at the bottom work roll, but also produce slide for softer stratigraphic drilling.
The teeth on the sub-cone tipped steel teeth and two inserts is the cone ring gear outer cone drilling, inserts carbide teeth of different size and shape; steel tooth roller cone directly from on milled. Each row of teeth meshing with each other on three cone drill bit, can not be repeated effectively and comprehensively broken rock bottom and prevent balling bad tooth shape of the teeth, the size, number, length depends on the formation being drilled hardness, the softer the ground, the teeth, the more pointed, the less arranged contrary, the harder formations, the smaller the shorter the teeth, the greater the number.
Carbide teeth hardness and abrasion resistance than steel tooth height, long service life than steel teeth, especially crushing hard abrasive formations have, the better. Wide range of its application layer, multi footage, ROP and more, It has been widely used in oil drilling.