The structure and characteristics of diamond drill bits
The crown of the diamond bit is the working part of the bit for cutting rock. Its surface (working surface) is inlaid with diamond material cutting teeth and is arranged with a hydraulic structure. Its side is the gauge part (inlaid gauge teeth), it and the bit body Connected, made of tungsten carbide carcass or steel material.
The bit body is a steel material body, the upper part is threaded and connected to the drill string, and the lower part is connected to the crown carcass (the steel crown is integrated with the bit body).
The hydraulic structure of diamond drill bits is divided into two categories. The first type is used for natural diamond drill bits and TSP drill bits. The drilling fluid of this type of drill bit flows out from the central water hole, and is dispersed through the surface of the drill bit to the working surface of the drill bit to cool, clean and lubricate the cutting teeth, and finally carry the cuttings from the side water groove and The chip flute flows into the annular space. The other type is used for PDC bits. The drilling fluid of this type of bit flows out from the water hole, and is distributed to various parts of the working surface of the bit through various diversion elements to cool, clean and lubricate the cutting teeth. The position and number of water holes of the PDC bit are determined by the bit structure.
The gauge part of the diamond material plays the role of righting the drill bit and ensuring that the diameter of the well does not shrink when drilling. The method of inserting diamonds on the side of the drill bit is used to achieve the purpose of gauge gauge.