Full radial protection PDC bit

Abstract

The invention discloses a full-gauge-protection PDC drill bit which is used in oil drilling and other industries; the PDC drill bit consists of a fluid flowing waterway, a nozzle, a bit body, a gauge-cylinder gauge protection and polycrystalline diamond compacts (PDC); a layer of castings are fixed on the fluid flowing waterway at the periphery of the fluid flowing waterway; the casings connect the outside diameters of the gauge-cylinder gauge protection into a smooth integration so that the gauge-cylinder full gauge protection is formed; the gauge protection of the drill bit in the invention can reach the maximum, thereby realizing the own rectification effect of the drill bit, reducing the whirl of the drill bit, prolonging the service life of the drill bit, greatly increasing the size of the drill bit and the drilling speed of a machinery and having simple manufacturing technology.

Description

technical field [0001] The invention relates to a PDC drill bit suitable for use in soft, medium-hard and hard formations, and is widely used in geological exploration, coal mining, traffic tunnels, water conservancy and hydropower, oil drilling and other industries. Background technique [0002] At present, PDC drill bits have been widely used in most oil fields and other industries in the country. Such as figure 1 As shown, the commonly used PDC bit is composed of a fluid flow channel 1, a nozzle 2, a bit body 3, a gauge and a diameter gauge 4, and a composite sheet 5. This structure of the PDC bit is easily damaged from the perspective of the use effect, and the main characteristics of the damage are Phenomena such as tooth column breakage, composite chip fragmentation, chip loss, erosion, and drill bit matrix erosion, among which shortened service life due to unequal wear of cutting teeth is a very common phenomenon; in addition, from the damage characteristics of PDC d...

AI Technical Summary

Problems solved by technology

like figure 1 As shown, the commonly used PDC bit is composed of a fluid flow channel 1, a nozzle 2, a bit body 3, a gauge and a diameter gauge 4, and a composite sheet 5. This structure of the PDC bit is easily damaged from the perspective of the use effect, and the main characteristics of the damage are Phenomena such as tooth column breakage, composite chip fragmentation, chip loss, erosion, and drill bit matrix erosion, among which shortened service life due to unequal wear of cutting teeth is a very common phenomenon; in addition, from the damage characteristics of PDC drill bits, When the PDC bit is working downhole, in addition to the reaction force and formation rock wear caused by normal cutting of the formation, it is also subject to dynamic impact loads caused by whirl, which is the main reason for the abnormal damage of the PDC bit.

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