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Long-service-life drill bit with self-repairing capacity

A long-life, self-repairing technology, used in drill bits, drilling equipment, earth-moving drilling, etc., can solve the problems of low feeding capacity, low rock breaking efficiency, and reduced cutting gear ratio pressure value, and achieve the effect of improving efficiency.

Active Publication Date: 2016-07-20
SOUTHWEST PETROLEUM UNIV +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In the above patent scheme, the secondary teeth (or backup cutting teeth) are directly embedded and fixed on the blade body. When the secondary teeth play a cutting role, the blade body around the secondary teeth also directly participates in contact with the rock at the bottom of the well and occurs Therefore, a large amount of drilling pressure is shared, and the specific pressure value directly acting on the cutting teeth is greatly reduced, resulting in the eating capacity of the secondary teeth being significantly lower than that of the surface-mounted cutting teeth of the drill bit. Therefore, although the drill bit can still work, But its rock-breaking efficiency is significantly lower than that of a new, unworn bit

Method used

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  • Long-service-life drill bit with self-repairing capacity
  • Long-service-life drill bit with self-repairing capacity
  • Long-service-life drill bit with self-repairing capacity

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0083] Such as Figure 1-6 , 8, a long-life PDC drill bit includes a drill bit body 1, a connecting thread 2, several water holes 11 and several blades 3 arranged on the drill bit body 1. Wherein said blade 3 can be such as figure 2 , 18 , the main blade 3a shown in 19 can also be as figure 2 , 20 , The auxiliary blade 3b shown in 21,22. The main difference between the main blade 3a and the auxiliary blade 3b is that the length of the blade 3 extends to the core area of ​​the drill bit, which is the main blade 3a, and the length not extending to the core area of ​​the drill bit is the auxiliary blade 3b.

[0084] In this example, if image 3 As shown, each blade includes a blade tooth surface composed of blade inner cone region 41 , crown region 42 , shoulder region 43 , blade front side 31 and blade rear side 32 . Wherein, dimples are arranged on the cloth tooth surface of each blade 3, and the first group of cutting teeth 61 are fixed in the dimples; There is at lea...

Embodiment 2

[0098] Such as Figure 9 As shown, this embodiment is basically the same as Embodiment 1. The difference is that: the blade 3 is provided with an empty slot 5 , and more than one second group of cutting teeth are fixed in the empty slot 5 . When there is only a single continuous empty groove 5 on a certain blade 3, it is beneficial to apply this tooth arrangement form. In this embodiment, by fixing a plurality of cutting teeth of the second group in one hollow slot, the tooth density of the cutting teeth of the second group can be further increased, and the service life of the PDC bit can be improved.

Embodiment 3

[0100] Such as Figure 10 As shown, this embodiment is basically the same as Embodiment 1. The difference is that two or more hollow grooves 5 are provided on the blade 3, at least two hollow grooves 5 are arranged in different radial areas of the drill bit, and at least one second hollow groove 5 is provided in each hollow groove 5. Set of cutting teeth 62 . By arranging two or more discontinuous hollow groove structures on the blade body, it is possible to avoid excessive reduction in the structural strength of the blade due to too large or too long hollow grooves on the blade, which may cause the blade to collapse. danger of breaking.

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Abstract

The invention discloses a long-service-life drill bit with self-repairing capacity, and belongs to the technical field of drilling equipment for petroleum and natural gas, mine engineering, building foundation engineering construction, geology, hydrology and the like. The long-service-life drill bit with the self-repairing capacity comprises a drill bit body and at least one blade; a plurality of first groups of cutting teeth are formed in the blade; slots are formed in the tooth distribution surface of the blade and / or the gauge protection surface of the blade and are used for fixing the first groups of the cutting teeth; at least one empty groove and at least one second group of cutting teeth are formed in at least one blade; slots are formed in the empty groove and are used for fixing the second group of the cutting teeth; at least part cutting edges of the second group of the cutting teeth are exposed from the inner surface of the empty groove. According to the long-service-life drill bit with the self-repairing capacity, after the cutting teeth in a certain area of the drill bit is worn completely, new cutting teeth can be exposed naturally to realize self-repairing of the drill bit, so that the self-repaired drill bit can drill continuously and effectively.

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 long-life drill bit. Background technique [0002] PDC bit is one of the most commonly used drilling tools in drilling engineering, especially in today's oil and gas drilling engineering, the footage obtained by PDC bit has accounted for more than 80% of the total oil and gas drilling footage, occupying an absolutely important position. [0003] The PDC drill bit is mainly composed of a drill body, a connecting thread and a blade, and a polycrystalline diamond composite sheet (ie, a PDC tooth, hereinafter also referred to as a cutting tooth or a composite sheet) arranged on the blade. The blade of the PDC drill bit includes the main blade and the auxiliary blade. The main difference is that in the radial view of the drill, the blade...

Claims

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Application Information

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IPC IPC(8): E21B10/43E21B10/26
CPCE21B10/26E21B10/43
Inventor 杨迎新刘清友戚清亮任海涛林敏张春亮黄奎林
Owner SOUTHWEST PETROLEUM UNIV
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