Polycrystalline diamond compact bit with four blades

Abstract

The invention provides a polycrystalline diamond compact bit with four blades. The profiles of the two main blades and the profiles of the two auxiliary blades are in a circular arc shape, a small number of cutting teeth are arranged at the positions close to the center of the bit, a large number of cutting teeth are arranged at the positions close to the edge of the bit, the first rows of cutting teeth are tunneling teeth, the second rows of cutting teeth and the third rows of cutting teeth are ploughing teeth, the tops of the tunneling teeth are in a pinnacle shape, and the tops of the pinnacles are inclined towards one side of the center of the bit. Broaching teeth are in a disc shape, and stabilizing teeth are in a strip shape. By means of the arc-shaped design of the blades, the tooth-shape design of the tunneling teeth and the arrangement of the cutting teeth, the bit can initiatively discharge chippings in the tunneling process, the working temperature of the cutting teeth is lowered, the working conditions of the cutting teeth are improved, and the bit balling phenomenon is not likely to occur; by means of the tooth-shape design of the tunneling teeth, the crushing capability of the bit is improved, the centripetal force of the bit is increased, and the drilling quality is improved; meanwhile, all the cutting teeth are evenly stressed, and the service life of the bit is prolonged; by means of the arrangement of the initiative type guiding stabilizing teeth, the guiding performance of the bit is good, and the vortex motion preventing performance of the bit is improved.

Description

Technical field: [0001] The invention relates to the field of oilfield drilling tools, in particular to a four-blade polycrystalline diamond composite drill bit. Background technique: [0002] The polycrystalline diamond composite drill bit is composed of a steel matrix, a tungsten carbide sintered layer and a diamond composite sheet arranged on the tungsten carbide sintered layer. The arrangement of teeth and the density of the teeth on the crown of the diamond composite directly affect the performance of the drill. Because the linear velocity of the drill bit is different across the entire diameter, the force of the cutter teeth on each diameter is not the same. The working position of each cutter tooth is different, and the direction of the force is impacted and vibrated. If the resultant centripetal force is not strong, the entire drill bit is prone to vortexing. If the gauge surface of the drill bit has a cutting effect on the well wall, it will damage the well wall and caus...

AI Technical Summary

Problems solved by technology

[0002] The polycrystalline diamond compact drill bit is composed of a steel matrix, a tungsten carbide sintered layer and a diamond composite sheet arranged on the tungsten carbide sintered layer. The arrangement of teeth and the density of the diamond composite sheet on the crown of the drill directly affect the performance of the drill. , because the linear velocity of the drill bit is different on the entire diameter, the force of the cutter teeth on each diameter is also different, the working position of each cutter tooth is different, the direction of the force impacts and vibrates, and the force of each cutter tooth Weak resultant centripetal force will also make the whole drill bit prone to vortex. If the gauge surface of the drill bit has a cutting effect on the well wall, it will damage the well wall and cause the drill bit to move horizontally. The mud discharge groove between the blade and the blade is not properly arranged. It is also the main reason for the poor mud discharge and the formation of mud bags on the drill bit

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