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Fixed cutting-tooth drilling bit

A technology of cutting teeth and drill bits, which is applied in construction and other directions, can solve problems such as high working life and difficulty in reaching, and achieve the effects of improving service life, increasing exposure height, and enhancing the ability to penetrate into the formation

Active Publication Date: 2012-02-29
SOUTHWEST PETROLEUM UNIV +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In this way, although a faster drilling speed can be obtained, it is difficult to achieve a higher working life

Method used

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  • Fixed cutting-tooth drilling bit
  • Fixed cutting-tooth drilling bit
  • Fixed cutting-tooth drilling bit

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0047] Such as Figure 1 to Figure 8 As shown, a fixed cutter bit with a stacked tooth structure includes a drill body 1 and a cutting tooth. The cutting tooth is composed of a base tooth 2 and a stacked tooth 3. 2 is provided with a groove 5 that matches the shape of the stacked tooth 3, and the stacked tooth 3 is fixed in the groove 5 of the base tooth 2. The total height H of the stacked tooth structure formed by the stacked tooth 3 and the base tooth 2 is greater than The theoretical height H of the base tooth 1 . The base teeth 2 and stacked teeth 3 are respectively selected from PDC composite chips, thermally stable polycrystalline diamond cutting teeth, natural diamond cutting teeth, impregnated diamond cutting teeth, carbide cutting teeth, cubic boron nitride cutting teeth, ceramic cutting teeth , or, cutting teeth containing diamond or cubic boron nitride. The rear end of the base tooth can be a spherical surface (such as Figure 4 shown) or flat (as Figure 5 sh...

Embodiment 2

[0049] This embodiment is basically the same as Embodiment 1, the difference being that the theoretical profile of the cutting edge of the base tooth 2 is non-circular. Such as Figure 9 As shown, the cutting edge profile of the base tooth 2 is elliptical, which can significantly increase the wear height of the base tooth and the entire stacked tooth structure.

Embodiment 3

[0051] This embodiment is basically the same as Embodiment 1, the difference is that the cutting edge profile of the stacked teeth 3 is non-circular. Such as Figure 10 As shown, the cutting edge profile of stacked teeth 3 is a sharp wedge-shaped profile composed of straight line segments and arcs, which can enhance the ability of the cutting teeth to penetrate into the formation, and is more suitable for drilling in harder formations;

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PUM

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Abstract

The invention discloses a fixed cutting-tooth drilling bit and belongs to the field of rock-blasting tools for drilling equipment for oil and gas, mine engineering, building basic engineering construction, geology, hydrology and the like. The fixed cutting-tooth drilling bit comprises a drilling bit body and cutting teeth, wherein the cutting teeth are formed by combining base teeth and overlapped teeth; the base teeth are fixed on the drilling bit body; grooves which are matched with the overlapped teeth in shape are formed on the base teeth; the base teeth are partially or totally exposed out of a crown surface of the drilling bit; the overlapped teeth are fixed outwards in the grooves of the base teeth relative to the drilling bit body; and the total height of an overlapped teeth structure which is formed by the overlapped teeth and the base teeth is greater than the theoretical height of the base teeth. By adoption of the fixed cutting-tooth drilling bit, the stratum penetration capacity of a polycrystalline diamond compact (PDC) drilling bit can be improved, and the service life of the drilling bit can be prolonged.

Description

technical field [0001] The invention belongs to the field of rock-breaking tools used for drilling equipment such as petroleum and natural gas, mining engineering, building foundation engineering construction, geology, and hydrology. Background technique [0002] The drill bit is a rock-breaking tool used in drilling engineering to break rock and form a wellbore. Existing drill bits are mainly divided into two categories: non-fixed cutter drills and fixed cutter drills (or called non-fixed cutting structure drills and fixed cutting structure drills). The so-called non-fixed cutting tooth drill bit refers to a drill bit with relative movement between the teeth or cutting teeth and the drill bit body in the working state. If the cutting teeth on the drill bit are always consolidated with the bit body and there is no relative movement between each other, this type of drill bit is called a fixed cutter bit. [0003] The typical representative of the non-fixed cutter bit is the...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): E21B10/43E21B10/55
Inventor 杨迎新陈炼林敏黄奎林周建胡珩齐海涛
Owner SOUTHWEST PETROLEUM UNIV
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