Vibration-torsion compound impact speed-up drill bit

Abstract

The invention discloses a vibrating and twisting combined impact speeding-up drill. The vibrating and twisting combined impact speeding-up drill comprises a drill column, a drill bit arranged at one end of the drill column, and a hydraulic passageway arranged in the length direction of a drill column body. The hydraulic passageway comprises an axial hydraulic passageway body and a twisting direction hydraulic passageway body which are sequentially arranged from top to bottom in the overall flowing direction of the hydraulic passageway. The axial hydraulic passageway body is provided with an axial vibration impact system for providing axial vibration for the drill bit, the twisting direction hydraulic passageway body is provided with a twisting direction vibration impact system for providing twisting direction vibration for the drill bit, and the axial vibration impact system and the twisting direction vibration impact system both conduct power transmission through the drill column. The axial vibration impact system and the twisting direction vibration impact system are organically combined into the same drill column, a non-thread type drill bit assembly is clamped to the drill column, and therefore local stress is avoided effectively. Axial vibration impact and twisting direction vibration impact directly act on a drill bit body, and energy attenuation is avoided to the greatest extent.

Description

Technical field [0001] The invention relates to an oil drilling and production downhole tool, in particular to a vibration-torsion compound impact speed-increasing drill bit. Background technique [0002] Vibration impact near the axis of the drill bit and vibration impact in the torsional direction can effectively help the PDC drill bit composite piece to eat into the rock, cut the rock, vibrate and break the rock, and prevent the bit from getting stuck on the rock. However, the small vibration and impact force is not enough to significantly increase the rock breaking efficiency. Excessive impact will damage the drill bit itself and shorten the life of the drill bit. [0003] At present, commonly used vibration impact tools, such as the rotary punching tool combined with the screw motor, have a very limited installation size, so the impact force is weak, and the drill tool carried under the screw motor further attenuates this vibration impact force, increasing the rotation Impuls...

AI Technical Summary

Problems solved by technology

However, the small vibration impact is not enough to significantly increase the rock breaking efficiency, and the excessive impact will damage the drill bit itself, resulting in shortened life of the drill bit

[0003] At present, commonly used vibration and impact tools, such as rotary punching tools combined with screw motors, have a weak impact force due to the very limited installation size, and the drilling tool carried under the screw motor further attenuates the vibration impact force, increasing the rotary force. The impact force will increase the length of the tool, affect the orientation, and cause premature fatigue damage to the screw drive shaft

Currently commonly used torsional impactors need to be connected to the drill bit through threads, so the weight of the lower end of the tooth is relatively large, resulting in a large attenuation of torsional impact and affecting the rock-breaking efficiency of the drill bit.

[0004] On the current drilling tool assembly, if the rotary punching and torsion punching tools are combined, the connection length is longer, which affects the rigidity of the drilling tool, and the stress is too concentrated on the thread, which is not conducive to the reliability of the drilling tool, the cost is high, and the orientation is difficult.

[0005] In addition, because the rotary punch is compounded with the screw, it is difficult to maintain after use. It requires professional operators from the original factory to disassemble and maintain in special workshops and special tools. The more common method is to send it back to the original factory for maintenance. As a result, tool maintenance costs are also high and the maintenance cycle is long, which is not suitable for low-cost operations.

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