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PDC (polycrystalline diamond compact) bit tool capable of doing eccentric swing rotation

A technology of eccentric swing and eccentric rotation, applied in drill bits, drilling equipment, earth-moving drilling and mining, etc., can solve problems such as inability to achieve rock breaking

Active Publication Date: 2015-01-28
CHENGDU HUILINGFENG DIAMOND BIT
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At this time, the drill bit will not be able to achieve the effect of "breaking rock in the form of alternate scraping"

Method used

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  • PDC (polycrystalline diamond compact) bit tool capable of doing eccentric swing rotation
  • PDC (polycrystalline diamond compact) bit tool capable of doing eccentric swing rotation
  • PDC (polycrystalline diamond compact) bit tool capable of doing eccentric swing rotation

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0050] like Figures 1 to 9 As shown, the PDC bit tool of the present invention that can realize eccentric swing rotation is composed of an eccentric shaft 1, an outer shell 2, a PDC bit 3, a cycloidal shaft 4, and a lower joint 6, wherein:

[0051] like Figure 5 As shown, one end of the eccentric shaft 1 is provided with a connecting thread 11, and the middle part is provided with a positioning shoulder 13, and the center distance between the geometric center of the eccentric shaft section 12 and the geometric center of the eccentric shaft body is e.

[0052] like Image 6 As shown, the upper and lower ends of the outer casing 2 are respectively provided with connecting threads 22 and 23 . Gauge corrugations 21 are arranged on the outer cylindrical surface, and the gauge corrugations 21 can be in a straight structure or in a spiral structure, and the number of them is two or more. An axial shackle surface 25 is arranged on the upper end of the outer shell 2, and the shack...

Embodiment 2

[0061] like Figure 10 As shown, this embodiment is basically the same as Embodiment 1, and the difference is that passive wear-resistant teeth 211 or active cutting teeth 212 are fixed on the gage flute 21, or passive wear-resistant teeth 211 and active cutting teeth are fixed at the same time. 212.

[0062] Under the ideal drilling conditions of the conventional PDC bit (the "ideal drilling condition" here refers to the working state of the PDC bit in the process of drilling and breaking rocks, the center of rotation of the bit coincides with or approximately coincides with the center of the wellbore trajectory) The cutting amount and cutting load in the drill bit do not change much, so its mechanical stability is good (under ideal drilling conditions, the ratio of lateral unbalanced force to axial force of most PDC bits can be controlled within 5% level).

[0063]However, in this embodiment, the PDC bit performs alternating trajectory cutting motion, and the cutting amount...

Embodiment 3

[0066] like Figure 11 As shown, this embodiment is basically the same as Embodiment 2, and the difference is that a lower joint 6 is provided between the PDC drill bit 3 and the cycloidal shaft 4, and the lower joint 6 is connected to the outer shell 2, and in the An eccentric bearing 7 is installed between the PDC drill bit 3 and the lower joint 6 . The eccentric bearing 7 can be a needle roller eccentric bearing, a sliding bearing, a cylindrical roller bearing, a double-row tapered roller bearing, or a self-aligning roller bearing.

[0067] Since in this embodiment, the PDC drill bit 3 is a cantilever structure in the state of track-changing eccentric rotary motion, its structural rigidity and mechanical stability are lower than those of conventional PDC drill bits. Introducing the eccentric bearing 7 in this embodiment can make the "eccentric wheel-PDC bit" mechanism into a double support structure, thereby improving the structural rigidity and mechanical stability of thi...

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Abstract

The invention discloses a PDC (polycrystalline diamond compact) bit tool capable of doing eccentric swing rotation, and belongs to the field of rock breaking tools for drilling equipment. The PDC bit tool comprises an eccentric shaft, a housing body, a PDC bit and a cycloidal shaft, wherein the PDC bit is fixedly connected to the cycloidal shaft; the cycloidal shaft is arranged in the housing body in a matched way and can perform relative variable trajectory eccentric rotation; an eccentric shaft section arranged on the eccentric shaft is arranged in the inner cavity of the cycloidal shaft in a matched way to form a rotary pair; the inner flow channels of the eccentric shaft, the cycloidal shaft and the PDC bit are communicated. According to the PDC bit tool, the alternative cutting trajectory motion is made, so that the stratum penetration capability of the PDC bit can be remarkably improved, the rock breaking efficiency is improved, and the wear rate of cutting teeth is reduced; the PDC bit tool has remarkable technical advantages on difficultly drilled deep strata and high-hardness and high-abrasiveness strata.

Description

technical field [0001] The invention relates to the field of rock-breaking tools for drilling equipment such as petroleum and natural gas, mining engineering, building foundation engineering construction, geology, and hydrology, in particular to a PDC drill bit equipment used for rock-breaking for drilling equipment. Background technique [0002] The drill bit is a rock-breaking tool used in drilling engineering to break the rock at the bottom of the well and form a wellbore. The conventional drill bits used in drilling engineering today mainly include three-cone bits, PDC bits, impregnated diamond bits, and roller-PDC hybrid bits. [0003] Among them, PDC drill bit (polycrystalline diamond compact drill bit) is the most commonly used drilling tool in oil drilling engineering. With the continuous advancement of cutting tooth material technology and bit design technology, its unique drilling safety, structural flexibility and efficient cutting performance for shearing and br...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): E21B10/43E21B10/16E21B10/25
CPCE21B10/16E21B10/25E21B10/43E21B10/50E21B10/54
Inventor 任海涛杨迎新陈炼周春晓包泽军牛世伟黄奎林周谧张春亮
Owner CHENGDU HUILINGFENG DIAMOND BIT
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