Composite drilling bit with PDC combined tooth

A composite drill bit and bit body technology, which is applied in the direction of drill bits, drilling equipment, earthwork drilling, etc., can solve the problems of easy wear of cutting teeth and affect the service life of drill bits, and achieve the effect of improving wear resistance and service life

Active Publication Date: 2016-08-17
SOUTHWEST PETROLEUM UNIV +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Insufficient wear resistance of the cutting teeth is an important factor affecting the service life of the cone, and the easy wear of the cutting teeth directly affects the service life of the drill bit

Method used

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  • Composite drilling bit with PDC combined tooth
  • Composite drilling bit with PDC combined tooth
  • Composite drilling bit with PDC combined tooth

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0036] like Figure 1-4 As shown, a composite drill bit with PDC combined teeth includes a drill body 1, a fixed cutting structure 4 and a cone 2, the fixed cutting structure 4 is provided with a fixed cutting tooth 41, and the cone 2 and the drill body 1 are rotationally connected. The cone 2 can rotate relative to the bit body 1. The cone 2 is provided with cutting teeth. The drill body 1 is provided with at least one cone 2. At least one of the cutting teeth on the cone 2 is a PDC combination tooth 3. The PDC combination tooth 3. It is composed of two PDC teeth. The PDC teeth are composed of a body 31 and a polycrystalline diamond layer 32 covering the entire supporting surface of the body or a body 31 and a polycrystalline diamond layer 32 covering more than 60% of the supporting surface of the body. The two The combination of PDC teeth is that the polycrystalline diamond layer 32 is closely attached, and is clamped by the two outer bodies 31 to form a four-layer sandwich ...

Embodiment 2

[0038] like Figure 5 , 6 As shown, this embodiment is basically the same as Embodiment 1, the difference is that the outer sides of the body 31 on both sides of the PDC composite tooth 3 are cut off by concave curves to form a PDC composite tooth with a narrow top and a wide bottom. As an option, the body 31 on both sides of the PDC combined tooth 3 is cut off by a concave curve formed by a combination of multiple curves to form a PDC combined tooth with a narrow top and a wide bottom, such as Image 6 shown. Alternatively, the body 31 on both sides of the PDC composite tooth is cut by a concave curve formed by a combination of a curve and a straight line, forming a PDC composite tooth with a narrow upper part and a wider lower part.

Embodiment 3

[0040] This embodiment is basically the same as Embodiment 1, and the difference is that: the angle between the polycrystalline diamond layer plane of the PDC composite tooth 3 and the axial plane passing the setting point of the PDC composite tooth is 45-90°; further, the PDC The included angle between the polycrystalline diamond layer plane of the combination tooth 3 and the axis plane passing through the PDC combination tooth setting point is 60-90°; further, the polycrystalline diamond layer plane of the PDC combination tooth 3 and the PDC combination The included angle between the axial planes of the tooth setting points is 75-90°; in particular, the polycrystalline diamond layer plane of the PDC combined tooth 3 is perpendicular to the axial plane passing through the PDC combined tooth setting points.

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Abstract

The invention discloses a composite drilling bit with a polycrystalline diamond compact (PDC) combined tooth. The composite drilling bit with the PDC combined tooth comprises a drilling bit body, a fixed cutting structure and a cone, wherein at least one of cutting teeth on the cone is the PDC combined tooth formed by combining two PDC teeth, and each PDC tooth consists of a body and a polycrystalline diamond layer covering more than 60 percent of a supporting surface of the body; a combination manner of the two PDC teeth is as follows: the polycrystalline diamond layers are closely fitted and are clamped by the two bodies on the outer side to form a four-layer sandwich structure, the thickness of a part close to the cone is larger than the thickness of a part far away the con, the thicknesses of two-side parts of the body far away a tip part of the cone are smaller than the double thicknesses of the middle polycrystalline diamond layers, and the thicknesses of the two-side parts of the body fixed in the cone are larger than the triple thicknesses of the middle polycrystalline diamond layers; an included angle between a normal line of a fitting surface of the polycrystalline diamond layers of the PDC combined tooth and a normal line of an cone outline curved surface of a PDC combined tooth arrangement point on the cone is 75-90 degrees. The composite drilling bit with the PDC combined tooth can improve the rock breaking efficiency of the composite drilling bit and prolong the service life of the composite drilling bit.

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 composite drill bit with PDC combined teeth. Background technique [0002] The drill bit is a rock-breaking tool used in drilling engineering to break rock and form a wellbore. The drill bits used in drilling engineering today mainly include PDC (polycrystalline diamond compact) drill bits and roller cone bits. [0003] The cutting teeth on the PDC bit are fixed on the bit body, and the cutting teeth and the bit body are relatively fixed. The PDC bit is a fixed cutting structure bit. The cone on the roller cone bit forms a rotational connection with the bit body through the bearing system. When the drill bit is working, the rotation of the bit body drives the cone to rotate around the axis of the drill bit. At the same time, the co...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): E21B10/50
CPCE21B10/50
Inventor 陈炼杨迎新任海涛杨燕黄奎林
Owner SOUTHWEST PETROLEUM UNIV
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