CN207092961U - Drag bit device - Google Patents
Drag bit device Download PDFInfo
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- CN207092961U CN207092961U CN201720818240.1U CN201720818240U CN207092961U CN 207092961 U CN207092961 U CN 207092961U CN 201720818240 U CN201720818240 U CN 201720818240U CN 207092961 U CN207092961 U CN 207092961U
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- telescoping tube
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- drag bit
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Abstract
The utility model discloses a kind of drag bit device, and it is related to petroleum engineering well drilling technical field, and drag bit device includes：Body, heating power jet units and the reaction chamber being connected with heating power jet units is provided with body, heating power jet units include：The through hole that is opened up in body, the first spring being arranged in through hole, the first telescoping tube to be offseted with the first spring, the second spring being arranged in the first telescoping tube and the second telescoping tube, the upper end of first spring can be fixed with this body phase, second spring is connected with the second telescoping tube, second telescoping tube can slide so that the lower end of the second telescoping tube projects through hole in the first telescoping tube, reaction chamber is used to generate heating power Jetstream fluid, and heating power Jetstream fluid is conveyed into heating power jet units；Also there is cutting tooth on body；The heating power jet initiation unit being connected with reaction chamber, heating power jet initiation unit are used to light a fire to reaction chamber.
Description
Technical field
Petroleum engineering well drilling technical field is the utility model is related to, more particularly to a kind of drag bit device.
Background technology
China central and east oil field has progressed into development late stage, and about 40% is in deep formation in Remaining Oil And Gas resource
(＞ 4500m).The giant oil-gas field of discovered in recent years, such as Tarim Basin, NE Sichuan, the distant oil field of pine are in deep formation, because
The exploration and development of this Deep Oil And Gas Exploration has become the Major Strategic Demand of China's oil gas development.Deep formation formation hardness is high, can
Boring property is poor, and with the increase of well depth, rig mechanical energy and hydraulic energy linear loss are big, and effective utility of laser power is low, conventional
Mechanical means drilling speed is low, cycle length, constrains the Efficient Development process of China's Deep Oil And Gas Exploration.Therefore exploitation one kind is needed badly to be applied to
The efficient scraper drill bit device of deep layer hard formation, to realize the strategic objective of China's Sustainable Development of Petroleum Resource.
Utility model content
In order to overcome the drawbacks described above of prior art, the utility model embodiment technical problem to be solved there is provided
A kind of drag bit device, the rock that it can be high to hardness in deep formation carry out effectively broken.
The concrete technical scheme of the utility model embodiment is：
A kind of drag bit device, the drag bit device include：
Body, heating power jet units and the reaction chamber being connected with the heating power jet units are provided with the body,
The heating power jet units include：The through hole that is opened up in the body, the first spring being arranged in the through hole, with
The first telescoping tube that first spring offsets, the second spring being arranged in first telescoping tube and the second telescoping tube,
The upper end of first spring can be fixed with described body phase, and the second spring is connected with second telescoping tube, described
Second telescoping tube can slide the lower end stretching through hole so that second telescoping tube in first telescoping tube, described
Reaction chamber is used to generate heating power Jetstream fluid, and the heating power Jetstream fluid is conveyed into the heating power jet units；Described
Also there is cutting tooth on body；
The heating power jet initiation unit being connected with reaction chamber, the heating power jet initiation unit are used to carry out reaction chamber
Igniting.
In a preferred embodiment, the through hole includes first paragraph hole and is connected with the first paragraph hole
The second segment hole connect, the first paragraph hole and forms step between the second segment hole.
In a preferred embodiment, the upper end in the first paragraph hole is provided with clamp nut, the compression
Nut can offset with the upper end of first spring.
In a preferred embodiment, first telescoping tube is arranged in the first paragraph hole, and described first
The lower end of telescoping tube can be inconsistent with the step, and first telescoping tube can slide in the first paragraph hole.
In a preferred embodiment, at least partly described second telescoping tube is located in first telescoping tube, extremely
The second telescoping tube is located in the second segment hole of the through hole described in small part.
In a preferred embodiment, the heating power jet units are multiple that the body vertically has
Axis, the heating power jet units are in circumferentially distributed around the axis of the body.
In a preferred embodiment, second telescoping tube in the heating power jet units and the body
Axis has predetermined angle.
In a preferred embodiment, the drag bit device also includes：Rotated for driving body
Drag bit motor；For connecting the shaft coupling of the body and the drag bit motor.
In a preferred embodiment, water cooling runner is offered in the body, the lower end of the body is described
The exit of water cooling runner is provided with hydrophthalmia nozzle.
In a preferred embodiment, the water cooling runner is located at the outside of the heating power jet units, the water
Eye nozzle is located at the outside of the through hole.
The technical solution of the utility model has following notable beneficial effect：
1st, the drag bit device of the application can form supercritical water and carbon dioxide mix in the reaction chamber of body
Heating power Jetstream fluid, then the drilling fluid after pressurization is conveyed into reaction chamber by corresponding feed-line, drilling fluid with it is above-mentioned
The fluid of HTHP is coupled, and is modulated into the heating power Jetstream fluid of stable supercritical water and carbon dioxide, heating power jet
Fluid and then the rock cut by heating power jet units directive cutting tooth, heating power Jetstream fluid impact rock simultaneously conducts heat rapidly,
Rock surface is caused to produce crack until cracking, the fragment of rock surface peel off, stress is released, and at the same time, coordinates this
The cutting tooth of body constantly rotates, and new scar appears, and so as to reach the purpose of quick broken rock, finally drilling is continued
It is efficient to carry out.
2nd, the heating power Jetstream fluid formed in the application in drag bit device is supercritical water and carbon dioxide, and it can be with
So that the discharge of the pollutant in drilling process reduces several orders of magnitude, so as to greatly reduce environmental pollution.Moreover, above-mentioned scrape
Technology in knife drill bit device is relatively simple, and compared with liquid nitrogen drilling well, laser drill, plasma drilling technology, scraper bores
Raw material (fuel) cost used in head device is relatively low, and comparatively speaking, drilling process has more cost advantage, and safety can
Lean on.
Brief description of the drawings
Accompanying drawing described here is only used for task of explanation, and is not intended in any way to limit disclosed in the utility model
Scope.In addition, shape and proportional sizes of each part in figure etc. are only schematical, it is used to help to reason of the present utility model
Solution, it is not the specific shape and proportional sizes for limiting each part of the utility model.Those skilled in the art is new in this practicality
Under the teaching of type, various possible shapes and proportional sizes can be selected to implement the utility model as the case may be.
Fig. 1 is the cross-sectional view of drag bit device in the utility model embodiment.
Fig. 2 is the upward view of drag bit device in the utility model embodiment.
The reference of the figures above：
1st, body；2nd, heating power jet units；21st, through hole；211st, first paragraph hole；212nd, second segment hole；213rd, platform
Rank；22nd, the first spring；23rd, the first telescoping tube；24th, second spring；25th, the second telescoping tube；26th, clamp nut；3rd, reaction chamber；
4th, cutting tooth；5th, heating power jet initiation unit；6th, drag bit motor；7th, water cooling runner.
Embodiment
With reference to the description of accompanying drawing and the utility model embodiment, can clearly understand of the present utility model
Details.But specific embodiment of the present utility model described here, it is only used for explaining the purpose of this utility model, without
It can be understood as being to limitation of the present utility model in any way.Under teaching of the present utility model, technical staff is contemplated that
Based on any possible deformation of the present utility model, these are regarded as belonging to the scope of the utility model.Need what is illustrated
It is that when element is referred to as " being arranged at " another element, it can be directly on another element or there may also be placed in the middle
Element.When an element is considered as " connection " another element, it can be directly to another element or can
There can be centering elements simultaneously.Term " installation ", " connected ", " connection " should be interpreted broadly, for example, it may be mechanically connect or
Electrical connection or the connection of two element internals, can be joined directly together, can also be indirectly connected by intermediary,
For the ordinary skill in the art, the concrete meaning of above-mentioned term can be understood as the case may be.Made herein
Term " vertical ", " horizontal ", " on ", " under ", "left", "right" and similar statement simply to illustrate that mesh
, it is unique embodiment to be not offered as.
Unless otherwise defined, all of technologies and scientific terms used here by the article and the technical field of the application is belonged to
The implication that technical staff is generally understood that is identical.The term used in the description of the present application is intended merely to description tool herein
The purpose of the embodiment of body, it is not intended that in limitation the application.Term as used herein "and/or" includes one or more
The arbitrary and all combination of related Listed Items.
It is effectively broken in order to be carried out to the high rock of hardness in deep formation, a kind of scraper is proposed in this application
Drill bit device, Fig. 1 are the cross-sectional view of drag bit device in the utility model embodiment as shown in figure 1, scraper bores
Head device includes：Body 1, heating power jet units 2 and the reaction chamber 3 being connected with heating power jet units 2 are provided with body 1,
Heating power jet units 2 include edge：The first bullet that the interior edge predetermined angle of body 1 offers through hole 21, is arranged in through hole 21
Spring 22, the first telescoping tube 23 to be offseted with the first spring 22, the second spring 24 and second being arranged in the first telescoping tube 23
Telescoping tube 25, the upper end of the first spring 22 can be fixed with the phase of body 1, and second spring 24 is connected with the second telescoping tube 25, and second
Telescoping tube 25 can be slided so that the lower end of the second telescoping tube 25 projects through hole 21 in the first telescoping tube 23, and reaction chamber 3 is used for
Heating power Jetstream fluid is generated, and heating power Jetstream fluid is conveyed to heating power jet units 2；Also there is cutting tooth 4 on body 1；With
The heating power jet initiation unit 5 that reaction chamber 3 is connected, heating power jet initiation unit 5 are used to light a fire to reaction chamber 3.
By the application it was discovered by researchers that being directed to deep layer hard formation, rock thermal cracking rock breaking method can be a kind of row
Effective manner, by rock thermal cracking broken rock can the fragment of rock surface peel off, accelerate new in deep layer hard formation
Scar appear, and then the stress of drag bit device upper blade drill bit part is released, creep into it is lasting carry out, finally may be used
To effectively raise the speed of drilling well.In order to cause the purpose of rock thermal cracking and then broken rock, in this application
It has developed heating power jet rock-breaking and well-drilling technology.The technology is produced using the chemical energy of fuel combustion has certain temperature and pressure
High temperature heating power jet, carry out impact rock after conduct heat rapidly, cause rock surface produce crack until cracking, in new landwaste
Further crept into after peeling off surface, reach the purpose of quick rock-breaking and well-drilling.Above-mentioned drag bit device bores for heating power jet broken rock
One of key device in well technology.
Drag bit device tripping in the application drives its rotation to deep layer hard formation by drill bit motor,
Cutting tooth 4 during rotation on drag bit device body 1 carries out a certain degree of to rock in deep layer hard formation etc.
It is broken.
Now, in order to more efficiently fractured rock, first can by corresponding feed-line into reaction chamber 3 it is defeated
Send the fuel gas after pressurization, the oxygen after pressurization.Then reaction chamber 3 is lighted a fire by heating power jet initiation unit 5, this
When, the temperature in reaction chamber 3 can be controlled to reach 400-500 DEG C, pressure reaches 30MPa, and at this temperature and pressure, injection is anti-
Answer the water of generation in chamber 3 in a supercritical state.It is swollen because of high temperature when temperature reaches 374.1 DEG C, when pressure reaches 21.83MPa
The density of swollen water and the density of the vapor compressed by high pressure are just equal, and water reaches supercriticality, shows height
The monophasic fluid state of warm high pressure.Now, then the drilling well after pressurization can be conveyed into reaction chamber 3 by corresponding feed-line
Liquid, drilling fluid are coupled with the fluid of above-mentioned HTHP, and the heating power for being modulated into stable supercritical water and carbon dioxide is penetrated
Flow fluid, heating power Jetstream fluid and then entrance heating power jet units 2.
When heating power Jetstream fluid of the reaction chamber 3 formed with supercritical water and carbon dioxide mix, heating power Jetstream fluid stream
Enter the through hole 21 in drag bit device body 1, under the effect of the pressure, the spring 22 of second spring 24 and first is pressurized, with
So that the first telescoping tube 23 moves downward, the second telescoping tube 25 extends downwardly from, while the second telescoping tube 25 is in the first telescoping tube 23
The lower end and through hole 21 for inside sliding into second spring 24 offset, and the lower end of the second telescoping tube 25 extends downwardly from through hole 21.When
After the lower end of second telescoping tube 25 extends downwardly from through hole 21, heating power Jetstream fluid is penetrated outlet from the lower end of the second telescoping tube 25
Go out, stretched by the above-mentioned means, can effectively shorten the second of heating power jet by the second telescoping tube 25 when needing to carry out jet
The draw 25 exports the distance between the stratum cut with the cutting tooth 4 of drag bit device body 1 or rock, substantially increases
Heating power jet units 2 are to the speed that rock sprays and injection pressure.After heating power Jetstream fluid directive rock, heating power jet stream
Body impact rock is simultaneously conducted heat rapidly, causes rock surface to produce crack until cracking, the fragment of rock surface peel off, stress is able to
Release, at the same time, the cutting tooth 4 of body 1 is coordinated constantly to rotate, new scar appears, so as to reach the mesh of quick broken rock
, finally enable drilling to continue efficiently to carry out.Effective coupling is carried out by heating power jet in said process and mechanical rock breaking
Close, effectively promoted the rapid destruction of hard formation so that bit speed is doubled and redoubled.This drag bit device can be efficient
The rock high to hardness in portion stratum effectively crush, so as to improve drilling speed and drilling efficiency.
Simultaneously as heating power Jetstream fluid is supercritical water and carbon dioxide, it can cause the pollution in drilling process
The discharge of thing reduces several orders of magnitude, so as to greatly reduce environmental pollution.Moreover, the technique skill in above-mentioned drag bit device
Art is relatively simple, compared with liquid nitrogen drilling well, laser drill, plasma drilling technology, the raw material that are used in drag bit device
(fuel) cost is relatively low, and comparatively speaking, drilling process has more cost advantage, and securely and reliably.
In order to be better understood from the well system in the application, it will be further explained and illustrated below.Such as
Shown in Fig. 1, the upper end on drag bit device body 1 can be fixedly connected by screw thread and oil pipe.Drag bit device
Heating power jet units 2 on body 1 include：The through hole 21 opened up in body 1, the first spring being arranged in through hole 21
22nd, the first telescoping tube 23 for being offseted with the first spring 22, the second spring 24 being arranged in the first telescoping tube 23 and second stretch
The draw 25, the upper end of the first spring 22 can be fixed with the phase of body 1, and second spring 24 is connected with the second telescoping tube 25, and second stretches
The draw 25 can be slided so that the lower end of the second telescoping tube 25 projects through hole 21 in the first telescoping tube 23.Specifically, run through
Hole 21 can include first paragraph hole 211 and the second segment hole 212 being connected with first paragraph hole 211, first paragraph hole 211
And step 213 is formed between second segment hole 212, the upper end in first paragraph hole 211 is provided with clamp nut 26, compresses spiral shell
Mother 26 can be offseted with the upper end of the first spring 22, and the first telescoping tube 23 is arranged in first paragraph hole 211, the first telescoping tube 23
Lower end can be inconsistent with step 213, and the first telescoping tube 23 can slide in first paragraph hole 211, at least partly the second telescoping tube
25 are located in the first telescoping tube 23, and at least partly the second telescoping tube 25 is located in the second segment hole 212 of through hole 21.Work as heat
During heating power Jetstream fluid of the unit of power jet reaction chamber 3 formed with supercritical water and carbon dioxide mix, heating power Jetstream fluid stream
Enter the through hole 21 in body 1, in the presence of the high pressure of heating power Jetstream fluid, the first spring 22 and second spring 24 are pressurized,
First so that the first telescoping tube 23 slided down in through hole 21 first telescoping tube 23 lower end and step 213 it is inconsistent,
Then the second telescoping tube 25 slid into the first telescoping tube 23 second spring 24 lower end and step 213 it is inconsistent, Ran Hou
Two springs 24 continue to shrink, and the second telescoping tube 25, which continues to slide in second segment hole 212 downwards, to be stretched out, final second telescoping tube
25 lower end extends downwardly from through hole 21.By the above-mentioned means, can have when needing to carry out jet by the second telescoping tube 25
Effect shortens the distance between the outlet of the second telescoping tube 25 and stratum of heating power jet, significantly increases heating power jet units 2 to rock
The speed of stone injection and injection pressure.
In a kind of feasible embodiment, heating power jet units 212 can be multiple, the body 1 of drag bit device
Vertically there is axis, heating power jet units 2 are circumferentially distributed around the axis of body 1, and Fig. 2 is the utility model embodiment
The upward view of middle drag bit device, as shown in Fig. 2 in this embodiment, heating power jet units 2 are three, each heating power
Jet units 2 are between two cutting tooths 4.
In a kind of feasible embodiment, in order to improve heat-resisting quantity, carbon can be coated with the reaction chamber 3 on body 1
Change the exotic materials such as tungsten, wolfram steel, to extend the service life of reaction chamber 3.In order to improve the hardness of drag bit device, strengthen
The crushing effect of the drag bit device rock high to hardness in deep formation, the body 1 of drag bit device can use nickel
Alloy is made.
In a preferred embodiment, water cooling runner 7 is offered in body 1, the lower end of body 1 is in water cooling runner 7
Exit be provided with hydrophthalmia nozzle.As shown in Fig. 2 water cooling runner 7 can be multiple, water cooling runner 7 is in around the axis of body 1
Circle distribution, in this embodiment, water cooling runner 7 are three, and each water cooling runner 7 is between two cutting tooths 4.Body
1 water cooling runner 7 is connected with corresponding cooling water supply pipeline, while drag bit device is crept into, passes through cooling water
Supply pipeline constantly conveys cooling water to the water cooling runner 7 of body 1, and cooling water sprays from hydrophthalmia nozzle, so as to on body 1
Cutting tooth 4 cooled down, and then can maximum time prolonged mechanical when boring so that the drilling depth and drilling speed of whole drag bit device
All greatly improve.Landwaste after the drilling fluid that cooling water is discharged with heating power jet units 2 will can also crush carries out pit shaft, reaches
To the purpose of bottom-hole cleaning, the row of returning under the drilling fluid reclamation unit recovery well that is connected with well mouth of oil well can be passed through on the ground
To the drilling fluid and/or cooling water on ground.
In a preferred embodiment, the axis of the second telescoping tube 25 and body 1 in heating power jet units 2 has
Predetermined angle.As shown in figure 1, the second telescoping tube 25 in heating power jet units 2 can be towards the outside of body 1, in this way, self-heating
The heating power Jetstream fluid projected in power jet units 2 is more easy to the cutting of the rock high with hardness in deep formation of directive cutting tooth 4
Contact position, help to cut the broken of contact position rock.Meanwhile water cooling runner 7 can be located at the outside of heating power jet units 2,
Hydrophthalmia nozzle is located at the outside of through hole 21.On the one hand said structure can cause water cooling runner 7 not influence the temperature in reaction chamber 3
Degree, the position of still further aspect hydrophthalmia nozzle is it is possible to prevente effectively from the cooling water of outflow has influence on heating power jet units 2 and carries out heat
The region of power jet.
In a preferred embodiment, drag bit device also includes：For the scraper for driving body 1 to be rotated
Drill bit motor 6；For connecting the shaft coupling of body 1 and drag bit motor 6.Drag bit device in the application
Due to drag bit motor 6 is arranged on body 1, when drag bit device gos deep into deep well hard formation, direct well
Lower energy supply, drag bit motor 6 can directly drive body 1 to be rotated, smaller along journey energy loss, in this way, can be with
The efficiency of transmission of rotating speed and energy is greatly improved, avoids and sets motor on the ground, connected by the transmission of complexity
Connect on the drag bit device for transferring a torque to underground and caused by energy transmission it is low the problem of.
Multiple element, composition, part or step can be provided by single integrated component, composition, part or step.It is alternative
Ground, single integrated component, composition, part or step can be divided into multiple element, composition, part or the step of separation.It is used for
The open "a" or "an" for describing element, composition, part or step is not said to exclude other elements, composition, part
Or step.
Each embodiment in this specification is described by the way of progressive, what each embodiment stressed be with
The difference of other embodiment, between each embodiment identical similar part mutually referring to.Above-described embodiment is only
Illustrate technical concepts and features of the present utility model, it is new its object is to allow person skilled in the art to understand this practicality
The content of type is simultaneously implemented according to this, can not limit the scope of protection of the utility model with this.It is all real according to the utility model spirit
The equivalent change or modification that matter is made, it should all cover within the scope of protection of the utility model.
Claims (10)
1. a kind of drag bit device, it is characterised in that the drag bit device includes：
Body, heating power jet units and the reaction chamber being connected with the heating power jet units are provided with the body, it is described
Heating power jet units include：The through hole that is opened up in the body, the first spring being arranged in the through hole, with it is described
The first telescoping tube that first spring offsets, the second spring being arranged in first telescoping tube and the second telescoping tube, it is described
The upper end of first spring can be fixed with described body phase, and the second spring is connected with second telescoping tube, and described second
Telescoping tube can slide in first telescoping tube so that the through hole, the reaction are stretched out in the lower end of second telescoping tube
Chamber is used to generate heating power Jetstream fluid, and the heating power Jetstream fluid is conveyed into the heating power jet units；On the body
Also there is cutting tooth；
The heating power jet initiation unit being connected with reaction chamber, the heating power jet initiation unit are used to carry out a little reaction chamber
Fire.
2. drag bit device according to claim 1, it is characterised in that the through hole include first paragraph hole and with
The second segment hole that the first paragraph hole is connected, the first paragraph hole and forms platform between the second segment hole
Rank.
3. drag bit device according to claim 2, it is characterised in that the upper end in the first paragraph hole is provided with
Clamp nut, the clamp nut can offset with the upper end of first spring.
4. drag bit device according to claim 3, it is characterised in that first telescoping tube is arranged on described first
In sector hole hole, the lower end of first telescoping tube can be inconsistent with the step, and first telescoping tube can be in the first paragraph
Slided in hole.
5. drag bit device according to claim 2, it is characterised in that at least partly described second telescoping tube is located at institute
State in the first telescoping tube, at least partly described second telescoping tube is located in the second segment hole of the through hole.
6. drag bit device according to claim 1, it is characterised in that the heating power jet units are described to be multiple
Body vertically has axis, and the heating power jet units are in circumferentially distributed around the axis of the body.
7. drag bit device according to claim 6, it is characterised in that described second in the heating power jet units
The axis of telescoping tube and the body has predetermined angle.
8. drag bit device according to claim 1, it is characterised in that the drag bit device also includes：For
The drag bit motor that driving body is rotated；For connecting the connection of the body and the drag bit motor
Axle device.
9. drag bit device according to claim 1, it is characterised in that water cooling runner, institute are offered in the body
The lower end for stating body is provided with hydrophthalmia nozzle in the exit of the water cooling runner.
10. drag bit device according to claim 9, it is characterised in that the water cooling runner is located at the heating power and penetrated
The outside of unit is flowed, the hydrophthalmia nozzle is located at the outside of the through hole.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201720818240.1U CN207092961U (en) | 2017-07-07 | 2017-07-07 | Drag bit device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201720818240.1U CN207092961U (en) | 2017-07-07 | 2017-07-07 | Drag bit device |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN207092961U true CN207092961U (en) | 2018-03-13 |
Family
ID=61556044
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201720818240.1U Active CN207092961U (en) | 2017-07-07 | 2017-07-07 | Drag bit device |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN207092961U (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107152241A (en) * | 2017-07-07 | 2017-09-12 | 中国石油天然气集团公司 | Drag bit device |
| CN112983283A (en) * | 2019-12-18 | 2021-06-18 | 新奥科技发展有限公司 | Plasma torch rock breaking composite drill bit and plasma torch rock breaking composite drill |
-
2017
- 2017-07-07 CN CN201720818240.1U patent/CN207092961U/en active Active
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107152241A (en) * | 2017-07-07 | 2017-09-12 | 中国石油天然气集团公司 | Drag bit device |
| CN107152241B (en) * | 2017-07-07 | 2023-09-12 | 中国石油天然气集团公司 | Thermal jet drag bit device |
| CN112983283A (en) * | 2019-12-18 | 2021-06-18 | 新奥科技发展有限公司 | Plasma torch rock breaking composite drill bit and plasma torch rock breaking composite drill |
| CN112983283B (en) * | 2019-12-18 | 2023-02-21 | 新奥科技发展有限公司 | Plasma torch rock breaking composite drill bit and plasma torch rock breaking composite drill |
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