How is the PDC drill bit working when drilling?

The PDC bit relies on the cutters installed on the bit body to cut the formation. These cutters have two types of structures: composite cutting teeth and tooth column type. The composite cutting teeth are reserved by welding the composite sheet directly on the bit body. formed in the groove. It is generally used for carcass drill bits; the tooth column type cutting teeth are formed by welding the composite sheet on the tungsten carbide tooth column, and the tooth column is inlaid or welded in the tooth space on the drill body during installation. It is generally used for Steel body drills are also available for carcass drills. The polycrystalline diamond composite sheet is the core of the cutting tooth. It is composed of a thin layer of artificial polycrystalline diamond and a bottom layer of tungsten carbide. It has high strength, high hardness and high wear resistance, and can withstand temperature of 750 ° C. A large number of experimental results have proved that among the mechanical strengths of rock, the tensile strength is the lowest, the shear strength is second, and the compressive strength is the highest, and the compressive strength is often several to ten times higher than the shear strength. Clearly it is much easier and more effective to break rock by shearing than by crushing. The composite cutting structure of the PDC bit makes use of the mechanical properties of the rock, and uses an efficient shearing method to break the rock, so as to achieve the purpose of fast drilling. When the PDC bit is advancing in the formation with soft to medium hardness, the composite cutters overcome the formation stress and eat into the formation and slide forward under the action of WOB and torque, and the rock is broken along its shearing direction under the action of the cutters and produces plasticity Flow, the rock cutting produced by cutting is in the shape of large pieces. This cutting process is very similar to the cutting of metal materials by the tool. outside the well. Xi'an Heaven Abundant Mining Equipment Co.,Ltd can supply kinds of PDC bit, such as geological Steel Body Pdc Bit and Matrix Body PDC Bit, oil well drilling PDC bit with matrix body and steel body, if you need any of them, please feel free to contact us.