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PDC drill bit with cutting teeth capable of axially impacting

A technology of axial impact and tooth cutting, which is applied in the direction of drill bits, drilling equipment, earthwork drilling and production, etc. It can solve the problems of high manufacturing cost and complex structure of torsion impactor, so as to improve the life of the drill bit, reduce the premature failure of the drill bit, and reduce the Effect of stick-slip vibration chance

Active Publication Date: 2020-11-03
刘伟
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The torsional impactor generally acts directly on the drill bit. This kind of torsional impactor has a complicated structure and high manufacturing cost.

Method used

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  • PDC drill bit with cutting teeth capable of axially impacting
  • PDC drill bit with cutting teeth capable of axially impacting
  • PDC drill bit with cutting teeth capable of axially impacting

Examples

Experimental program
Comparison scheme
Effect test

no. 1 example

[0032] Such as Figure 1-Figure 4 As shown, the present invention provides a PDC drill bit 100 in which the cutting teeth can axially impact, including a drill body 101, on which a blade 102, a nozzle 103, a fluid main channel 104, and a joint 105 are arranged, and a cutting blade is installed on the blade. 200 teeth. The cutting tooth 200 is composed of a central movable tooth 200 , a bushing 300 and a hydraulically driven rotator 400 ; the central movable tooth 200 is composed of a wear-resistant layer 201 (generally polycrystalline diamond) and a matrix 202 . The bottom of the central movable tooth 200 is provided with an uneven track 203 . The bushing 300 is provided with a bushing shaft 301 and a water hole 303; the hydraulic drive rotator 400 is provided with an impact head 401; the central movable tooth 200 and the bushing 300 are provided with a limiting groove 206, and the width of the central movable tooth 200 limiting groove It is larger than the limit groove of t...

no. 2 example

[0037] Such as Figure 7 As shown, the embodiment of the present invention provides a PDC drill with movable cutting teeth. The structure of this PDC drill is basically the same as that of the PDC drill in Embodiment 1, the difference is that the hydraulically driven spinner 400 is a helical turbine. When the fluid flows into the second fluid channel 302 through the hole 303 on the bushing 300, the ejected fluid enters the second fluid channel 302, and in the process of the fluid flowing from the second fluid channel 302 to the third fluid channel 205, there will be hydraulic pressure Drive the turbine plate on the rotator 400 to squeeze and push the turbine plate to rotate, thereby driving the impact head 401 to rotate, and finally the fluid is discharged from the third fluid channel 205 in the central rotating gear 200 into the wellbore annulus. The turbine in this scheme has the characteristics of high power and good transmission stability.

no. 3 example

[0039] Such as Figure 8 As shown, the embodiment of the present invention provides a PDC drill with movable cutting teeth. The structure of this PDC drill is basically the same as that of the PDC drill in Embodiment 1. The difference is that the bottom of the base body 202 of the central movable tooth 200 is a normal line An inclined plane whose direction forms a certain angle with the cutting tooth axis. The rotational movement of the impact head 401 on the hydraulically driven spinner 400 brings it into contact with different locations on the inclined plane. The movement trajectory of the impact head 401 on the inclined plane is a circle. As defined here, the point on the circle closest to the tooth plane is called the retraction point d1, and the farthest point is called the extension point d2. When the impact head 401 rotates from point d2 to point d1, the impact head 401 tends to break away from the central movable tooth 200. However, due to the movable connection betwe...

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Abstract

The invention discloses a PDC drill bit with cutting teeth capable of axially impacting. The drill bit comprises a drill bit body, blades, nozzles and a fluid main channel are arranged on the drill bit body, the cutting teeth are installed on the blades, and each cutting tooth is composed of a center movable tooth, a bush, a limiter and a hydraulic drive rotator. An uneven rail is arranged at thebottom of the center movable tooth, a shaft and a water hole are arranged on the bush, an impact head is arranged on the hydraulic drive rotator, the center movable tooth is movably connected with thebush through the limiter, and the hydraulic drive rotator is rotatably connected with the shaft on the bush. A first fluid channel is formed in the body, a second fluid channel is formed in the center movable tooth, the first fluid channel is communicated with the main channel, the second fluid channel is formed in the space in the bush, the second fluid channel is communicated with the first fluid channel through the water hole in the bush, and the second fluid channel is communicated with a third fluid channel. The impact effect of the cutting teeth on the stratum along the axis can be achieved, the rock breaking efficiency is improved, and the drilling cost is reduced.

Description

technical field [0001] The invention belongs to the technical field of drilling equipment such as petroleum and natural gas, mining engineering, building foundation engineering construction, geology, hydrology, etc., and specifically relates to a movable cutting tooth used to be embedded and fixed on a drill bit, and a PDC drill bit with the cutting tooth. Background technique [0002] Polycrystalline diamond tooth (referred to as PDC tooth) is a cutting tooth used to be fixed on the drill body. The cutting teeth are mainly composed of a diamond layer and a cemented carbide matrix. The diamond layer has the characteristics of high hardness, high wear resistance and self-sharpening. The drill bit equipped with PDC teeth is called PDC bit, which is widely used in the field of drilling technology, and has many advantages such as high mechanical drilling speed, long service life and high drilling safety. [0003] In recent years, with the increasing proportion of exploration an...

Claims

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Application Information

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IPC IPC(8): E21B10/54E21B10/43E21B10/60
CPCE21B10/54E21B10/43E21B10/602
Inventor 刘伟其他发明人请求不公开姓名
Owner 刘伟
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