PDC drill tool with alternating cutting trajectory

A technology of variable cutting and drill bit, which is applied in the direction of drill bit, drilling equipment, earthwork drilling and mining, etc. It can solve the problems such as failure to break rocks, achieve the effects of improving self-sharpening and attacking ability, slowing down wear speed and high reliability

Active Publication Date: 2014-12-10
四川宝石机械石油钻头有限责任公司
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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 drill tool with alternating cutting trajectory
  • PDC drill tool with alternating cutting trajectory
  • PDC drill tool with alternating cutting trajectory

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0057] Such as Figures 1 to 9 As shown, the PDC bit tool with alternating cutting tracks of the present invention is composed of an eccentric shaft 1, an outer shell 2, a PDC bit 3, a cycloidal shaft 4, a needle tooth group 5, and a lower joint 6. The needle tooth group 5 consists of several Pintooth pin 51 and pintooth sleeve 52 are formed. in:

[0058] Such as 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.

[0059] Such as Figure 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 ...

Embodiment 2

[0068] Such as 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.

[0069] Under the ideal drilling conditions of the conventional PDC bit (the "ideal drilling condition" here refers to the working state in which the center of rotation of the bit coincides or nearly coincides with the center of the wellbore trajectory during the process of drilling and breaking the PDC bit), the cutting teeth rotate in one revolution period. 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).

[0070]However, in this embodiment, the PDC bit performs alternating tra...

Embodiment 3

[0073] Such as Figure 11 As shown, this embodiment is basically the same as Embodiment 2, and the difference is that three or more rows of needle holders 24 are vertically arranged on the inner cylindrical surface of the outer shell 2 in the axial direction.

[0074] In this embodiment, since the PDC bit is directly connected with the cycloid shaft, the loads it bears include axial pressure, torque, and bending moment, etc., especially in hard formations or heterogeneous formations, the instantaneous Shock loads are very high. Therefore, in this embodiment, the radial load fluctuation of the meshing force between the cycloidal shaft and the pin-tooth group is relatively large, and the distribution of the axial load is also very uneven. In order to improve the stability and reliability of the pin-tooth in meshing transmission, There are three or more rows of needle holders, which are used to support the needle pins and needle sleeves.

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Abstract

The invention discloses a PDC drill tool with an alternating cutting trajectory, and belongs to the field of rock breaking tools for drilling equipment. The PDC drill tool with the alternating cutting trajectory comprises an eccentric shaft, an outer shell, a PDC drill and a cycloid shaft. The PDC drill is fixedly connected to the cycloid shaft, the cycloid shaft is matched inside the outer shell and can eccentrically rotate relative to the alternating trajectory, and an eccentric shaft section arranged on the eccentric shaft is matched in an inner cavity of the cycloid shaft to form a revolute pair. An inner flow channel of the eccentric shaft, an inner flow channel of the cycloid shaft and an inner flow channel of the PDC drill are communicated. By the adoption of the PDC drill tool, the alternating cutting trajectory movement can be made, the stratum eating-in capacity of the PDC drill can be improved remarkably, rock breaking efficiency is improved, the abrasion speed of cutting teeth can be better lowered, and in particular, the PDC drill tool has obvious technical advantages in a deep stratum which cannot be drilled easily and in a high hardness and high abrasiveness stratum.

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 bit tool 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 breaking rock make...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): E21B10/00E21B10/43
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 四川宝石机械石油钻头有限责任公司
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