Five-blade polycrystalline diamond compact drill bit

Abstract

The invention provides a five-blade polycrystalline diamond compact bit. Two main blades and three auxiliary blades form an outline in a circular arc shape. Fewer cutting teeth are arranged at the position close to the center of the bit. More cutting teeth are arranged at the position close to the edge of the bit. The cutting teeth in the first row are tunneling teeth. The cutting teeth in the second row are ploughing teeth. The tops of the tunneling teeth are in a pointed arch shape, and the tops of the pointed arches incline towards one side of the center of the bit. Broaching teeth are in a disc shape. Stabilizing teeth are in a strip shape. Through the design of the arc-shaped blades, the tooth profile design of the tunneling teeth and the arrangement of all the cutting teeth, the five-blade polycrystalline diamond compact bit can conduct chip removal initiatively in the drilling process, the working temperature of the cutting teeth is lowered, the working conditions of the cutting teeth are improved, and the balling phenomenon is not likely to occur; through the tooth profile design of the tunneling teeth, the crushing capacity 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 stressed uniformly, and the service life of the bit is prolonged; through the arrangement of the initiatively guided stabilizing teeth, the guiding property of the bit is good, and the anti-vortex-motion performance of the bit is improved.

Description

Technical field: [0001] The invention relates to the field of oilfield drilling tools, in particular to a five-blade polycrystalline diamond composite drill bit. Background technique: [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 da...

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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