CN219974408U - Coring bit - Google Patents

Abstract

The utility model relates to the technical field of coring bits, and discloses a coring bit which comprises a bit body and a plurality of blades; the device also comprises a plurality of broken core teeth for cutting off the rock core, a plurality of elastic modules and a limiting block; the blades are circumferentially distributed at the top of the drill bit body and are detachably and fixedly connected with the drill bit body; the edge of the blade is provided with a plurality of composite sheets; the inner side of the drill bit body is provided with a coring channel; an annular groove is formed in the inner side surface of the coring channel; the broken core teeth are circumferentially distributed in the annular groove and hinged with the drill bit body; the elastic module is used for enabling the broken core teeth to rotate towards the circle center; the limiting block is connected with the coring channel in a sliding way. After the core is formed, the core breaking teeth can be used for breaking the core through reversing, the blade and the drill bit body can be detached and fixed, parts can be partially replaced, and the core breaking drill is convenient to use and simple in structure.

Description

Coring bit

Technical Field

The utility model relates to the technical field of coring bits, in particular to a coring bit.

Background

In conventional geological exploration, oil drilling, geological research and other scientific drilling, a core is an important information carrier capable of reflecting deep underground geological conditions, and the core is acquired by means of a coring bit. However, after the core bit is used, a special core tool is needed to be used for taking the core, so that the operation is more and inconvenient; and the cost of the coring bit is higher, the current coring bit is generally an integral body, and if the cutting teeth are damaged, the coring bit can only be replaced, thus the working cost is higher.

CN201420762280 discloses a six-blade mixed-inlay core bit for shale gas coring, 6 blades are uniformly arranged on the bit crown of the upper section of the bit body, wherein the thicknesses of the blades are equal; the main cutting teeth arranged on the blades are formed by mixing and arranging TSP teeth in front and PDC cutting teeth in back. A surface groove is formed between each blade at the top of the drill crown, and a chip groove is formed between each blade at the side surface of the drill crown, wherein the surface groove is connected with the chip groove; an inner runner is arranged at the inner diameter of the drill bit body. This coring bit is through adopting front row TSP tooth to be triangle-shaped sharpness on the drill bit more to eat mud rock stratum easily, and the back row PDC tooth can prolong the life of whole drill bit, but because this drill bit is still whole, only can whole change when a certain cutting tooth damages, and the cost is higher, and after coring bit formed the core in addition, need use coring tool to get the core, and whole process is more, and consuming time is longer.

The technical problems to be solved by the utility model are as follows: how to make the core bit can be partly changed cutting position, reduce cost, make the core bit have the disconnected core function moreover to do not use extra coring tool, simplify the operation process.

Disclosure of Invention

The main purpose of the utility model is to provide a coring bit, which is detachably and fixedly connected with a bit body through a blade; when one blade is damaged, only one blade needs to be replaced, so that the replacement of the whole drill bit is avoided, and the cost is reduced; through elastic module and broken core tooth, when the rig is reversed, the tooth point of broken core tooth can the annular broken rock core to realize broken core coring, do not need extra instrument, simplify the operation process, improve work efficiency.

In order to achieve the above purpose, the present utility model adopts the following technical scheme:

a coring bit, comprising a bit body and a plurality of blades; the device also comprises a plurality of broken core teeth for cutting off the rock core, a plurality of elastic modules and a limiting block; the blades are circumferentially distributed at the top of the drill bit body and are detachably and fixedly connected with the drill bit body; the edge of the blade is provided with a plurality of composite sheets; the inner side of the drill bit body is provided with a coring channel; an annular groove is formed in the inner side surface of the coring channel; the broken core teeth are circumferentially distributed in the annular groove and hinged with the drill bit body; the elastic module is used for enabling the broken core teeth to rotate towards the circle center; the limiting block is connected with the coring channel in a sliding way.

Preferably, the top of the broken core tooth is provided with a cutting part; one side of the cutting part is an arc surface, and the other side is a plane.

Preferably, the elastic module is a torsion spring; the bottom of the broken core tooth is provided with a first groove; the two sides of the first groove are provided with first through holes; the torsion spring is fixed in the first groove; one end of the torsion spring is fixedly connected with the broken core teeth, and the other end of the torsion spring is fixedly connected with the annular groove; the first through hole and the torsion spring are hinged with the drill bit body through bolts.

Preferably, a plurality of limit posts are arranged in the annular groove; the number of the limit posts is equal to the number of the broken core teeth; the limiting post is used for limiting the rotation angle of the broken core teeth to be not more than 100 degrees.

Preferably, the drill bit body is provided with a plurality of second grooves; the blade and the second groove are detachably and fixedly connected through a screw; the number of the second grooves is equal to that of the blades.

Preferably, a water groove is formed between each blade at the top of the drill bit body; and chip grooves are formed between the blades on the side surface of the drill bit body.

Preferably, the depth of the water tank is 2cm.

Preferably, the number of blades is eight; five composite sheets are arranged on the blade.

Compared with the prior art, the scheme has the following beneficial effects:

1. the coring bit is detachably arranged on the bit body, so that when a composite piece on one blade is damaged, only the blade is required to be replaced, the whole replacement is not required, and the cost is reduced. In addition, in order to prevent the position of the blade from loosening, the second groove is used for limiting, and then the screw is used for fixing.

2. The coring bit is provided with an elastic module and a broken core tooth; when the drilling machine forwards rotates to drill down, the rock core is contacted with the cambered surface of the broken core tooth, so that the broken core function of the broken core tooth is invalid; when the drilling machine reverses, the rock core is contacted with the plane of the broken core teeth, the broken core teeth are used for crushing the rock core in the circumferential direction under the action of friction force through the pressure of the elastic module and the reversed inertia, and the rock core is supported after being crushed, so that the rock core is prevented from being separated from the coring bit when being lifted.

Drawings

FIG. 1 is a schematic view of the structure of a coring bit of example 1;

FIG. 2 is a cross-sectional view of the coring bit of example 1;

FIG. 3 is an exploded view of the coring bit of example 1;

FIG. 4 is a schematic view of the structure of the bit body of embodiment 1;

fig. 5 is a schematic structural view of the core teeth of example 1.

Detailed Description

For the purpose of making the objects, technical solutions and advantages of the embodiments of the present utility model more apparent, the technical solutions of the embodiments of the present utility model will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present utility model, and it is apparent that the described embodiments are some embodiments of the present utility model, but not all embodiments of the present utility model. The components of the implementations of the present utility model generally described and illustrated in the figures herein may be arranged and designed in a wide variety of different configurations.

Example 1

1-5, a coring bit includes a bit body 1, a plurality of blades 2; the device also comprises a plurality of broken core teeth 3 for cutting off the rock core, a plurality of elastic modules 4 and a limiting block 5; the blades 2 are circumferentially distributed at the top of the drill bit body 1 and are detachably and fixedly connected with the drill bit body 1; the edge of the blade 2 is provided with a plurality of composite sheets 6; the inner side of the drill bit body 1 is provided with a coring channel 11; an annular groove 12 is formed in the inner side surface of the coring channel 11; the plurality of broken core teeth 3 are circumferentially distributed in the annular groove 12 and hinged with the drill bit body 1; the elastic module 4 is used for enabling the broken core teeth 3 to rotate towards the circle center; the limiting block 5 is in sliding connection with the coring channel 11.

In this embodiment, the coring bit is mounted on the drill, and the stopper 5 is placed in the coring channel 11 and abuts against the broken core teeth 3 to prevent the broken core teeth 3 from rotating. Then the drilling machine rotates forward and drills downwards, when the coring bit continuously drills downwards, the blades 2 crush and core the soil layer, cores are gradually formed in the coring channels 11, the cores continuously move upwards, and the limiting block 5 is driven to move upwards; after the limiting block 5 moves upwards to leave the annular groove 12, the broken core teeth 3 can press the rock core to slide under the elastic action of the elastic module 4, but the rock core cannot be cut. When the core is long enough, the drilling machine stops rotating and starts rotating reversely, and the coring bit does not need to drill downwards in the reverse rotation process and only idles in the original position. When the core breaking teeth 3 rotate reversely, the core is pressed by the elastic force of the elastic module 4, and the inertia generated during the reverse rotation is added to circularly break the core. After the breaking is finished, the broken core teeth 3 can clamp the core to prevent the core from falling off from the coring bit, then, the drilling machine lifts the core and the coring bit, and after the core is taken out, the same operation is performed again, and the core is continuously drilled down until the task is finished. By the mode, a special coring tool is avoided, so that the whole process from the process of drilling down and forming the core to the process of taking the core of the coring bit is realized, the processing tool is simplified, and the working efficiency is improved.

Moreover, the blades 2 in the coring bit in this embodiment are removable and replaceable, and in the use process, if a certain composite sheet 6 is found to be damaged, only one blade 2 needs to be replaced, and the whole coring bit does not need to be replaced, so that the processing cost is greatly reduced.

Preferably, the top of the broken core teeth 3 is provided with a cutting part 31; the cutting portion 31 has a cambered surface on one side and a flat surface on the other side.

In this embodiment, in order to better realize that the forward rotation of the drilling machine does not have a cutting effect on the core, the reverse rotation of the drilling machine has a cutting effect on the core, one side of the cutting part 31 is an arc surface, the other side is a plane, when the drilling machine rotates forward, the core is contacted with the arc surface of the cutting part 31, the arc surface has a certain guiding effect, and the broken core teeth 3 rotate towards a direction away from the center of a circle due to the force formed in the sliding process of the broken core teeth and the core, so that the cutting effect is not exerted; when the drilling machine is reversed, the core is contacted with the plane of the cutting part 31 and is contacted with the sharp angle formed by the intersection of the plane and the cambered surface, and the sharp angle is continuously embedded into the core under the elastic force of the elastic module 4, so that the core is subjected to annular crushing.

Preferably, the elastic module 4 is a torsion spring; the bottom of the broken core tooth 3 is provided with a first groove 32; the first through holes 33 are arranged on two sides of the first groove 32; the torsion spring is fixed in the first groove 32; one end of the torsion spring is fixedly connected with the broken core tooth 3, and the other end of the torsion spring is fixedly connected with the annular groove 12; the first through hole 33 and the torsion spring are hinged with the drill bit body 1 through bolts.

In this embodiment, the action of torsion springs is used: firstly, the structure is simple, and stable rotating force can be provided; second, the two power ends of the torsion spring can be designed with a rotatable angle without the need for additional stop devices. The first groove 32 is designed in the broken core tooth 3, so that the torsion spring can be placed better and the movement of the torsion spring can be limited.

Preferably, a plurality of limit posts 13 are arranged in the annular groove 12; the number of the limit posts 13 is equal to that of the broken core teeth 3; the limiting post 13 is used for limiting the rotation angle of the broken core teeth 3 to be not more than 100 degrees.

In this embodiment, in order to further prevent the rotation of the broken core teeth 3, the annular groove 12 is provided with limit posts 13 with the same number as the broken core teeth 3, so that the broken core teeth 3 can support the core after breaking the core, and prevent the core from falling off from the coring bit in the lifting process.

Preferably, the drill bit body 1 is provided with a plurality of second recesses 14; the blade 2 is detachably and fixedly connected with the second groove 14 through a screw; the number of the second grooves 14 is equal to the number of the blades 2.

In the present embodiment, since the blades 2 are detachably fixed to the bit body 1, if they are fixed only by means of screws, the blades 2 are easily vibrated during rotary drilling, so that the positions of the blades 2 are deviated. Therefore, the second groove 14 is designed, the blade 2 is placed in the second groove 14 to limit the rotation direction, and then the blade 2 is fixed on the second groove 14 by the screw, so that the blade 2 is supported by the second groove 14 during rotation, and the offset is prevented.

Preferably, a water groove 15 is formed between each blade 2 at the top of the drill bit body 1; the chip grooves 16 are formed between the blades 2 on the side of the bit body 1. The water tank 15 is used to cool the coring bit by means of the slurry water.

Preferably, the depth of the water tank 15 is 2cm. Thus, the depth of the cutter blade 2 cut in the gravel layer can be ensured, certain strength can be ensured, and the cutter blade is not easy to break.

Preferably, the number of blades 2 is eight; five composite sheets 6 are arranged on the blade 2.

In the embodiment, an 8-blade 2 structure is adopted, and 5 composite sheets 6 are arranged on each blade 2, so that the drill bit can have enough strength and bearing capacity, more composite sheets 6 can be arranged, and the rock cutting capacity is enhanced. When the pressure-feed drilling is performed, after the middle two composite sheets 6 cut into the rock with larger pressure, the pressure of the middle 2 composite sheets 6 can be effectively dispersed by the three composite sheets 6 beside, so that the faster cutting speed can be ensured, and the service life of the composite sheets 6 can be prolonged.

While embodiments of the present utility model have been shown and described, it will be understood by those of ordinary skill in the art that: many changes, modifications, substitutions and variations may be made to the embodiments without departing from the spirit and principles of the utility model, the scope of which is defined by the claims and their equivalents.

Claims (8)

1. A coring bit, comprising a bit body and a plurality of blades; the device is characterized by further comprising a plurality of broken core teeth for cutting off the rock core, a plurality of elastic modules and a limiting block; the blades are circumferentially distributed at the top of the drill bit body and are detachably and fixedly connected with the drill bit body; the edge of the blade is provided with a plurality of composite sheets; the inner side of the drill bit body is provided with a coring channel; an annular groove is formed in the inner side surface of the coring channel; the broken core teeth are circumferentially distributed in the annular groove and hinged with the drill bit body; the elastic module is used for enabling the broken core teeth to rotate towards the circle center; the limiting block is connected with the coring channel in a sliding way.

2. The core bit according to claim 1, wherein a cutting portion is provided at a top of the broken core teeth; one side of the cutting part is an arc surface, and the other side is a plane.

3. The coring bit of claim 2, wherein the elastic module is a torsion spring; the bottom of the broken core tooth is provided with a first groove; the two sides of the first groove are provided with first through holes; the torsion spring is fixed in the first groove; one end of the torsion spring is fixedly connected with the broken core teeth, and the other end of the torsion spring is fixedly connected with the annular groove; the first through hole and the torsion spring are hinged with the drill bit body through bolts.

4. A coring bit according to claim 3, wherein a plurality of limit posts are disposed within said annular recess; the number of the limit posts is equal to the number of the broken core teeth; the limiting post is used for limiting the rotation angle of the broken core teeth to be not more than 100 degrees.

5. The core bit of claim 1, wherein the bit body is provided with a plurality of second flutes; the blade and the second groove are detachably and fixedly connected through a screw; the number of the second grooves is equal to that of the blades.

6. The core bit of claim 5, wherein a water channel is formed between each blade at the top of the bit body; chip grooves are formed between blades on the side face of the drill bit body.

7. The core bit of claim 6, wherein the water channel has a depth of 2cm.

8. The core bit of claim 1, wherein the number of blades is eight; five composite sheets are arranged on the blade.