A long-life drill bit with self-healing ability

A self-repairing, long-life technology, applied to drill bits, drilling equipment, earthwork drilling, etc., can solve problems such as low penetration capacity, reduced cutting gear ratio pressure value, low rock breaking efficiency, etc., and achieve the effect of improving efficiency

Active Publication Date: 2019-03-15
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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  • A long-life drill bit with self-healing ability
  • A long-life drill bit with self-healing ability
  • A long-life drill bit with self-healing ability

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0083] Such as Figure 1-6 As shown in Figure 8, a long-life PDC bit includes a bit body 1, a connecting thread 2, a plurality of water eyes 11 and a plurality of blades 3 arranged on the bit body 1. Wherein the blade 3 can be as figure 2 , 18 The main blade 3a shown in 19 can also be as figure 2 , 20 , 21, 22 shows the auxiliary blade 3b. 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 bit, namely the main blade 3a, and the auxiliary blade 3b does not extend to the core area of ​​the bit.

[0084] In this embodiment, as image 3 As shown, each blade includes a blade cloth tooth surface composed of a blade inner cone area 41, a crown area 42 and a shoulder area 43, as well as a blade front surface 31 and a blade rear surface 32. Wherein, a recess is provided on the tooth surface of each blade 3, and a first group of cutting teeth 61 is fixed in the recess; and, at least one blade 3 is p...

Embodiment 2

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

Embodiment 3

[0100] Such as Picture 10 As shown, this embodiment is basically the same as the first embodiment. The difference is that there are two or more hollow slots 5 on the blade 3, at least two hollow slots 5 are arranged in different radial areas of the drill, and each slot 5 is provided with at least one second Group cutting teeth 62. By arranging two or more discontinuous void structures on the blade body, it is possible to avoid excessive reduction in the strength of the blade structure due to excessively large or too long slots on the blade, which may cause the blade to collapse The 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 for 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 bit 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 bit is mainly composed of a bit body, connecting threads and blades, and a polycrystalline diamond composite sheet (namely PDC teeth, hereinafter also referred to as cutting teeth or composite sheets) arranged on the blade. The blades of the PDC bit include the main blade and the auxiliary blade. The main difference between them is that the blade extending to the core of the bit (or close to the cor...

Claims

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Application Information

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Patent Type & Authority Patents(China)
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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