Anti-whirling reverse rear perforation tooth drill bit

Abstract

The invention provides an anti-whirling reverse rear perforation tooth drill bit which comprises front-row PDC cutting teeth, a drill bit body, a connector, blades, gauge diameters, nozzles and clip grooves, wherein the drill bit body is connected with the connector; the connector is connected with the drill rod; a plurality of nozzles are embedded into the drill bit body; a plurality of blades are uniformly formed on the drill bit body; a plurality of PDC teeth are welded on each blade; a clip groove is formed between every two adjacent blades; the gauge diameters are arranged at the largest outer diameters of the connecting parts of the clip grooves and the connector; a certain number of reverse rear perforation teeth are arranged on the back side of each blade; the size and the number of the reverse rear perforation teeth are adjusted according to practical situations. When a deep well and a hard ground well are drilled, a certain number of the reverse rear perforation teeth are added to the back of each blade, and reverse cutting teeth are added, so that drill bit convolution can be effectively reduced, the adverse convolution force harmful to well drilling can be reduced, the force can be converted into cutting force beneficial to well drilling, rock breakage can be facilitated, the mechanical drilling speed of the drill bit can be increased, the well drilling speed can be increased, and the well drilling cycle can be shortened.

Description

technical field [0001] The invention relates to a rotary drilling bit for petroleum and geology, in particular to a drilling bit for deep wells and hard formations, in particular to an anti-rotation reverse rear tooth drill bit. Background technique [0002] At present, rotary drilling bits using PDC teeth as cutting teeth (PDC bits for short) are widely used in fields such as petroleum and geology. The PDC bit has the advantages of high ROP and long drilling life. Due to the fact that the drill pipe is too long and twisted during the drilling of deep wells and hard formations, the drill bit will rotate when drilling into hard formations, which directly reduces the attack power of the drill bit and may cause damage to the drill bit, thus prematurely damaging the drill bit , which seriously affects the drilling speed. In order to solve this problem, major drill bit companies have tried many methods, including the use of torsion impactors, anti-rotation gauges, etc.; with th...

AI Technical Summary

Problems solved by technology

Due to the fact that the drill pipe is too long and twisted during the drilling of deep wells and hard formations, the drill bit will rotate when drilling into hard formations, which directly reduces the attack power of the drill bit and may cause damage to the drill bit, thus prematurely damaging the drill bit , which seriously affects the drilling speed

In order to solve this problem, major drill bit companies have tried many methods, including the use of torsion impactors, anti-rotation gauges, etc.; with the use of torsional impactors, the drill bit can be rotated back and forth at high speed or stretched back and forth in the axial direction, the purpose of which is to reduce the rotation of the drill bit , so as to increase the drilling speed, the disadvantage is that the cost of the tool is too high, and the technology is very strong, so it cannot be popularized; the design effect of the anti-rotation gauging drill bit is not obvious

Now the drill bit rotation problem is a common and unresolved problem of PDC drill bits

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