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Composite drill bit

A technology of mixing drill bit and bit body, which is applied in the direction of drill bit, drilling equipment, earthwork drilling and mining, etc., which can solve the problems of low rock breaking efficiency, low rock efficiency, low energy utilization rate, etc., and achieve improved rock breaking efficiency and rock breaking efficiency Improve and benefit the effect of rock breaking efficiency

Active Publication Date: 2013-05-08
SOUTHWEST PETROLEUM UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The three-cone bit mainly breaks rocks in the form of impact crushing, that is, the teeth break rocks by impacting, squeezing and scraping with a small amount of slippage on the rocks. The disadvantage is that the energy utilization rate is not high and the rock breaking efficiency is relatively low. Low, and during the working process of the drill bit, the impact on the bearing is large, and the dynamic load coefficient is large
When the rock is very hard and the cutting teeth are difficult to penetrate the rock, or the cutting teeth are worn out and it is difficult to penetrate the rock, the rock breaking efficiency of these two drill bits will be reduced

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0098] Embodiment 1: as Figures 1 to 4 As shown, a hybrid drill bit includes a drill body 1, at least one cone 2 and at least one disc cutter 5, the cone 2 and the disc cutter 5 form a rotational connection with the drill body 1 through a bearing structure respectively, and the offset of the disc cutter 5 The range of the angle is [20°, 90°] or [-90°, -20°], the disc cutter 5 is provided with a disc cutter cutting tooth 51, the tooth wheel 2 is provided with a transverse insert 3, and the transverse insert 3 The value range of the addendum deflection angle α is 70°≤|α|≤90°. Preferably, the transverse insert 3 can be cemented carbide teeth, cemented carbide teeth reinforced with diamond, impregnated diamond teeth, or thermally stable polycrystalline diamond teeth. like figure 1 , 2 Shown in the figure, a roller cone and two disc cutters are set on the hybrid drill bit.

Embodiment 2

[0099] Embodiment 2: as Figures 5 to 8 As shown, this embodiment is basically the same as Embodiment 1, the difference is that: the drill body 1 is also provided with a fixed cutting structure 4 including fixed cutting teeth 41 . like Figures 5 to 7 As shown in the figure, the hybrid drill bit is provided with two fixed-wing fixed cutting structures, one cone, and one disc cutter, and the two fixed wings are arranged alternately with the cone and disc cutter. like Figure 8 As shown, the hybrid drill bit is provided with three fixed-wing fixed cutting structures and one cone, two disc cutters, and three fixed wings, cones, and disc cutters are arranged alternately.

Embodiment 3

[0100] Embodiment 3: This embodiment is basically the same as Embodiment 1 or 2, the difference being that the 4-point addendum width of the horizontal insert 3 is not less than 80% of the transverse length L1 of the horizontal insert 3 . More preferably, the width of the four-point tooth top of the horizontal insert 3 is equal to the transverse length of the horizontal insert 3, such as Figures 14 to 25 shown. That is, the 4-point width W of the tooth top of the horizontal insert is equal to the maximum lateral dimension of the part below the 4-point tooth top area, or the 4-point tooth top width W of the horizontal insert is greater than the lateral maximum dimension of the part below the 4-point tooth top area , At this time, a mushroom-like shape with a large top and a small bottom is formed. Figure 17 , 18 , 23, and 24 are a kind of mushroom-shaped horizontal insert 3 of the present invention. The lower fixed part 31 of the horizontal insert 3 and the upper exposed pa...

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PUM

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Abstract

The invention discloses a composite drill bit, and belongs to the technical field of drilling equipment in petroleum and gas, mine engineering, building foundation engineering construction, geology, hydrology and the like. The mixed drill bit comprises a drill bit body, at least one cone and at least one cutter disk. The cone and the cutter disk are respectively connected with the drill bit body through a bearing structure in a rotating mode. A range of a deflection angle of the disk cutter is from 20 degrees to 90 degrees or from -90 degrees to -20 degrees. The cutter disk is provided with cutter disk cutting teeth. The cone is provided with cross-embedded teeth, and a value range of a deflection angle alpha of the tooth top of each cross-embedded tooth is 70 degrees <=|alpha|<= 90 degrees. A novel cone structure is adopted and is combined with the disk cutter structure with large deflection angle so as to form the composite drill bit. The composite drill bit is high in rock breaking efficiency, the cone is stable in working, the drill bit is good in working stability, and meanwhile service life of the drill bit teeth and the bearing is prolonged, and therefore the service life of the drill bit is prolonged.

Description

technical field [0001] The invention belongs to the technical fields of drilling equipment such as petroleum and natural gas, mining engineering, building foundation engineering construction, geology, hydrology, etc., and specifically relates to a hybrid drill bit. Background technique [0002] The drill bit is a rock-breaking tool used in drilling engineering to break rock and form a wellbore. The tri-cone bits currently used in drilling engineering include steel tooth drill bits (also known as milling tooth drill bits) and carbide tooth drill bits (also known as insert tooth drill bits). The steel tooth drill bit is directly milling the cutting teeth on the cone body. The teeth have low strength and poor wear resistance, and are generally used in soft formations; Tungsten carbide teeth (hereinafter referred to as cemented carbide teeth or teeth), the hardness and wear resistance of cemented carbide teeth are obviously better than steel teeth, and are generally used in har...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): E21B10/16E21B10/43
Inventor 杨迎新陈炼林敏张春亮任海涛包泽军石擎天董博
Owner SOUTHWEST PETROLEUM UNIV
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