CN208089227U - Multi-electrode electric crushing drill bit and electric crushing experimental device - Google Patents
Multi-electrode electric crushing drill bit and electric crushing experimental device Download PDFInfo
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- CN208089227U CN208089227U CN201820098015.XU CN201820098015U CN208089227U CN 208089227 U CN208089227 U CN 208089227U CN 201820098015 U CN201820098015 U CN 201820098015U CN 208089227 U CN208089227 U CN 208089227U
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- drill bit
- electricity
- pair
- rock
- crushed
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Abstract
The utility model relates to a multi-electrode electric crushing drill bit and electric crushing experimental device, which adopts electric pulse power supply, the rising edge time of an output pulse power supply is 50ns-500ns, a plasma channel is firstly generated in rock through breakdown, the rock is crushed electrically, the drill bit is provided with a plurality of electrode pairs, and the contact between the electrodes and the rock is point contact, thereby having the characteristics of high rock crushing efficiency and low crushing energy consumption; the electric breaking experimental device can simulate rocks in a high-voltage environment, carry out electric pulse breaking drilling experiments, study drill bit electrodes, insulating materials, drilling parameters, rock breaking mechanisms of multiple physical fields and the like, and has the characteristics of simple structure, high reliability and the like. Electric pulse rock breaking drilling is a rock breaking drilling mode which has potential and is close to industrialization so far.
Description
Technical field
The utility model is related to the fields of creeping into, and are crushed drill bit more specifically to a kind of multi-pair electrodes electricity and electricity is broken
Experimental provision.
Background technology
The exploration and developments drilling applications such as petroleum gas constantly extend, and the research of efficient rock-breaking drilling technology is imperative,
Improve drilling efficiency.Traditional machinery drilling is in deep hole, the superdeep holes for boring high temperature and pressure, low, the drilling well expense with drilling efficiency
With it is high the shortcomings of.The non-mechanical broken rock mode in current more forward position mainly has：Rock breaking by water jet, particle stream flow broken rock, laser
Well drilling and rock crushing, plasma broken rock, ultrasonic wave broken rock and thermal energy broken rock etc., the technique of wanting summation device of the rock breaking by water jet to nozzle
It is required that high；The limitation of laser drill broken rock stimulated light device power, at present also in the laboratory exploratory stage；Ultrasonic wave broken rock uses
When have very much limitation, it is desirable that rock is brittle.Rock breaking by water jet, laser drill broken rock, ultrasonic wave broken rock etc. are still in experiment
Qualify Phase need further to verify for the feasibility in drilling well.
Plasma broken rock can be divided into liquid electricity broken rock and electric pulse is broken, and discharge plasma is generated in liquid medium, rock
The major impetus of stone broken rock comes from electric discharge generation shock wave, bubble is crumbled and fall and the mechanical forces such as pressure wave, and this effect claims liquid electric
Broken rock；Discharge plasma occurs mainly in rock interior, and the power of catalase produces when coming from plasma channel expansion
Raw stress, this breaking method are known as electricity and are crushed, i.e. EPB broken rocks.Electrohydraulic effect is broken for indirect broken rock；Electricity is broken for directly
Broken rock, it is more preferable with electric crushing effect under power；Electric pulse spread speed in rock is faster than in water, and electric pulse crushing efficiency is more
It is high；Electrohydraulic effect break down solids are based on compression failure, and the tensile stress formed in electric shattering process keeps rock more broken；
Electric reduction ratio electrohydraulic effect comminution energy conssumption is low.EPB drillings confirm its feasibility by many countries, and (electric pulse bores EPB
Into) have many advantages, such as that efficiency of breaking rock is high, wall quality is high, it is most potential so far, closest to industrialized broken rock side
Formula.Rotary drilling expense is ramped with the increase of depth, is more than 5000m in drilling depth, and drilling expense is more than 2000
Euro/m, more than 8000m, drilling expense is more than 30000 euro/m, and EPB drillings are not limited by drilling depth, and drilling expense is about
For 100 euro/m.
Utility model content
The purpose of this utility model is to design a kind of multi-pair electrodes high-voltage electricity that efficiency of breaking rock is high, wall quality is high to be crushed
Drill bit, and electric crushing experiment device, realize the rock under simulated high-pressure environment, carry out the broken drilling experiment of electric pulse.
Wherein aspect according to the present utility model, the utility model are to solve its technical problem, provide a kind of multi-electrode
To the broken drill bit of electricity, including insulation tube, bit arm outer tube is arranged on insulation tube, insulation tube is hollow, it is described it is hollow in be disposed with
Cable, the cable are electrically connected multiple high-low pressure electrodes pair positioned at the electric pulse broken rock drill bit lower end, and from institute
The upper end for stating insulation tube is pierced by, and the lower end of the electric pulse broken rock drill bit also has collets, and high-low pressure electrode is to may be contained within
On collets, collets are located at the multi-pair electrodes electricity and are crushed on the lower end of drill bit, by bit arm outer tube and each high-low pressure electrode
To keeping apart；The high-low pressure electrode is provided with multiple metal spokes to including a dead ring, along the axial direction of the dead ring,
Each metal spoke is oppositely arranged along the annular of dead ring, and two metal spokes one of opposite setting are accessed from the cable
Anode, an access cathode.
Preferably, it is crushed in drill bit in the multi-pair electrodes electricity of the utility model, on the upper end of the electric pulse broken rock drill bit
With lifting lug.
Another aspect according to the present utility model, the utility model are to solve its technical problem, and it is broken to additionally provide a kind of electricity
Broken experimental provision, including：
As the multi-pair electrodes electricity of any of the above-described is crushed drill bit；
Rope guide；
Steel wire rope connects the multi-pair electrodes electricity and is crushed drill bit, and drill bit is crushed to promote and transfer the multi-pair electrodes electricity；
The cable that guide roller, the steel wire rope and the multi-pair electrodes electricity are crushed drill bit connects after being oriented to roller guide
To the rope guide；
The pulse power is used for output electric pulse, and electric pulse rising time is 50ns-500ns, and the pulse power is electrical
The cable is connected, the cable with multichannel is respectively with each high-low pressure electrode to being connected；
Confining pressure cylinder component, including confining pressure cylinder, ionization aqueous drilling fluid, rock sample, confining pressure cylinder provide for the rock sample
Confining pressure, ionization aqueous drilling fluid provides dielectric between the high-field electrode and low-field electrode of the high-low pressure electrode pair, and carries
Make fragmentary debris worn out because of walking；
Hydraulic power unit is connected to the confining pressure cylinder component, and hydraulic pressure is provided for the confining pressure cylinder；
Water pump is passed in and out, the confining pressure cylinder component is connected to, to realize the cycle of the ionization aqueous medium；
Control device, the start and stop for controlling the hydraulic power unit, the disengaging water pump and the rope guide.
Preferably, it is crushed in drill bit in the multi-pair electrodes electricity of the utility model, further includes：
Experimental provision aluminium section bar holder, is used to support the hydraulic power unit and the multi-pair electrodes electricity is crushed drill bit, described
Rope guide is mounted on the experimental provision aluminium section bar holder, realizes the decentralization and recycling of steel wire rope and cable.
Preferably, in the electric crushing experiment device of the utility model, the pulse power includes that power frequency electric is boosted
Power frequency supply, two silicon stack rectifiers, multichannel electric spark switch, storage capacitor and the height voltage cable pair obtained afterwards；It is described
There are two output ends for the power frequency supply tool obtained after boosting, and it is whole that one of power frequency supply output end connects one of silicon stack
The anode of device is flowed, another silicon stack rectifier, storage capacitor are connected in parallel on the cathode and work of one of silicon stack rectifier
Between another output end of frequency power, the cathode of one of silicon stack rectifier and another described silicon stack rectifier are cloudy
Pole connects, each channel of multichannel electric spark switch：A height voltage cable is connected respectively to rear and be connected in institute in each channel
The both ends of storage capacitor are stated, each height voltage cable is to being electrically connected the cable.
Preferably, in the electric crushing experiment device of the utility model, when drilling, the multi-pair electrodes electricity is crushed drill bit
High-low pressure electrode pair is point-face contact with rock contact.
Preferably, in the electric crushing experiment device of the utility model, it is how high that multi-pair electrodes high-voltage electricity is crushed drill bit use
Low-field electrode is broken to discharging.
Multi-pair electrodes electricity is crushed drill bit and is powered using the pulse power, and the pulse power is switched with multichannel electric spark, can be defeated
The pulse for going out multichannel realizes multiple-pulse electric discharge simultaneously, catalase drilling efficiency by cable transmission to high low-field electrode pair
Height, and it is high using electric pulse broken rock wall quality；Multi-pair electrodes high-voltage electricity is crushed the high-low pressure electrode pair and rock contact of drill bit
For point-face contact, the waste of energy can be greatly reduced, energy loss is small；Multi-pair electrodes electricity is crushed drill bit and uses more height piezoelectricity
It is extremely broken to discharging, since discharge voltage height causes the ablation of electrode insulation block when avoiding single high-low pressure electrode to electric discharge, drop
The low requirement to insulating bulk material.Electric crushing experiment device can carry out the broken drilling experiment of electric pulse, can simulate earth interior height
Pressure ring border, thus to researchs such as the rock-cracking mechanisms of bit electrode, insulating materials, drilling parameter and multiple physical field, and can be real
Existing steel wire rope and cable synchronizing, have the characteristics that simple in structure, reliability is high.
A kind of multi-pair electrodes electricity of the utility model is crushed drill bit and electric crushing experiment device has the following advantages that：
(1) multi-pair electrodes electricity is crushed drill bit and uses more high-low pressure electrodes pair, catalase drilling efficiency height；
(2) multi-pair electrodes electricity is crushed drill bit and is crept into using electric pulse broken rock, and wall quality is high；
(3) multi-pair electrodes electricity is crushed drill bit high-low pressure electrode pair and is contacted to be point-face with rock contact, and energy loss is low；
(4) it is low compared to the broken drill bit of single electrode electricity to insulating bulk material requirement to be crushed drill bit for multi-pair electrodes electricity；
(5) electric crushing experiment device can simulate earth interior hyperbaric environment, can carry out the more influences of the broken drilling of more electric pulses
Factor Experiment is analyzed.
Description of the drawings
Fig. 1 is that a kind of multi-pair electrodes electricity of the utility model is crushed drill bit and electric crushing experiment assembly axis geodesic structure figure；
Fig. 2 is that a kind of multi-pair electrodes electricity of the utility model is crushed drill bit and electric crushing experiment device facing structure figure；
Fig. 3 is that the multi-pair electrodes electricity of the utility model is crushed bit exterior structure chart；
Fig. 4 is that the multi-pair electrodes electricity of the utility model is crushed drill bit internal structure chart；
Fig. 5 is that the multi-pair electrodes electricity of the utility model is crushed drill bit drilling structural schematic diagram；
Fig. 6 is the pulse power equivalent circuit diagram of the utility model；
Fig. 7 is the structural schematic diagram of the high-low pressure pulse pair of the utility model；
In above-mentioned figure：1-guide roller, 2-steel wire ropes, 3-control devices, 4-multi-pair electrodes electricity are crushed drill bit, and 4.1-
Lifting lug, 4.2-bit arm outer tubes, 4.3-collets, 4.4-high-low pressure electrodes pair, 4.4.1-dead ring, 4.4.2-electrode,
4.5-insulation tubes, 4.6-cables, the 5-pulse powers, 5.1-power frequency supplies, 5.2-silicon stack rectifiers, 5.3-energy storage electricity
Hold, 5.4-multichannel electric sparks switch, 5.5-height voltage cables pair, 6-confining pressure cylinder components, 6.1-confining pressure cylinders, 6.2-electricity
From aqueous medium, 6.3-rock samples, 7-hydraulic power units, 8-disengaging water pumps, 9-experimental provision aluminium section bar holders, 10-row's ropes
Device.
Specific implementation mode
For a clearer understanding of the technical features, objectives and effects of the utility model, now control attached drawing is detailed
Illustrate specific embodiment of the present utility model.
Embodiment 1：A kind of broken drill bit of multi-pair electrodes electricity of the utility model and electric crushing experiment device, structure such as Fig. 1,
2, shown in 3,4,5,6, electric crushing experiment device includes guide roller 1, steel wire rope 2, control device 3, the broken drill bit of multi-pair electrodes electricity
4, the pulse power 5, confining pressure cylinder component 6, hydraulic power unit 7, disengaging water pump 8, experimental provision aluminium section bar holder 9, rope guide 10, lead
To roller 14 gravity of drill bit is crushed in multi-pair electrodes electricity for realizing the guiding of steel wire rope 2 and cable 4.6, steel wire rope 2 and cable 4.6
Under the action of always be in tensioning state；Steel wire rope 2 is crushed drill bit for promoting and transferring multi-pair electrodes electricity；Control device 3 is used
In the start and stop of control hydraulic power unit, disengaging water pump and rope guide；It includes lifting lug 4.1, bit arm that multi-pair electrodes electricity, which is crushed drill bit 4,
Outer tube 4.2, collets 4.3, high-low pressure electrode pair 4.4, insulation tube 4.5, cable 4.6, when 5 output electric pulse of the pulse power,
Rising time is 50ns-500ns, and the cable 4.6 with multichannel is connected with high-low pressure electrode pair 4.4 respectively, works as multichannel
Electric spark switch 5.4 is opened, and generates voltage between high-low pressure electrode pair 4.4, due under the power pulse, the breakdown frequency of rock
Less than ionization aqueous medium, high-low pressure electric field breakdown rock, on rock interior generation plasma discharge channels, the pulse power
Energy be discharged into plasma discharge channels, and to channel heat.Plasma channel expanded by heating, and to the rock mass of surrounding
Acting.When stress is more than the stress intensity of rock, catalase.Multi-pair electrodes electricity, which is crushed drill bit 4, has multi-pair electrodes, can be real
Its efficiency of breaking rock now is improved along the different interface multiple discharge fractured rocks of rock simultaneously, multi-pair electrodes electricity is crushed 4 electrode of drill bit
It is point contact to be contacted between rock, and energy loss is small, insulation tube 4.5 for cable 4.6 and bit arm outer tube 4.2 it is completely insulated every
From preventing electromagnetic crosstalk of leaking electricity or occur, multi-pair electrodes discharge the ablation that can reduce to electrode insulation block 4.3 simultaneously, reduce pair
The requirement of 4.3 material of collets.
The pulse power 5 includes power frequency supply 5.1, two silicon stack rectifiers 5.2, the multichannels obtained after power frequency electric is boosted
Electric spark switch 5.4, storage capacitor 5.3 and height voltage cable pair 5.5；There are two outputs for the power frequency supply tool obtained after boosting
End, one of power frequency supply output end connect the anode of one of silicon stack rectifier 5.2, another silicon stack rectifier
5.2, storage capacitor 5.3 be connected in parallel on one of silicon stack rectifier 5.2 cathode and the power frequency supply after boosting it is another
Between one output end, the cathode of one of silicon stack rectifier 5.2 connects with another described 5.2 cathode of silicon stack rectifier
It connects, each channel of multichannel electric spark switch 5.4：It connects after a height voltage cable pair 5.5 and is connected in respectively in each channel
The both ends of the storage capacitor, each height voltage cable is to being electrically connected the cable.220V/380V power frequency electrics are boosted
After obtain power frequency supply 5.1, power frequency supply obtains direct current after 5.2 rectification of silicon stack rectifier, and storage capacitor 5.3 is to direct current
It is stored, multichannel electric spark switch 5.4 disconnects, and the storage capacitor 5.3 in discharge loop charges, multichannel electric spark switch
5.4 are closed, and energy is injected into the extremely short time in load, single pulse electric discharge are realized, when in multichannel electric spark switch 5.4
Multi-channel switch open simultaneously, then multi-pair electrodes electricity discharges simultaneously being crushed drill bit 4 high-low pressure electrode between 4.4, and realization is simultaneously
Multi-section fractured rock.
Confining pressure cylinder component 6 includes confining pressure cylinder 6.1, rock sample 6.3, ionization aqueous medium 6.2, and confining pressure cylinder 6.1 provides most
Big confining pressure is 350MPa, can simulate the hyperbaric environment in earth 10km, and ionization aqueous medium 6.2 primarily serves high-low pressure electrode pair
4.4 insulation and the cycle cutting carring by ionizing aqueous medium 6.2.
Hydraulic power unit 7 is that confining pressure cylinder 6.1 provides hydraulic pressure.
Pass in and out the cycle that water pump 8 realizes ionization aqueous medium 6.2.
Experimental provision aluminium section bar holder 9 is used to support hydraulic power unit 7, multi-pair electrodes electricity is crushed drill bit 4, uses aluminium section bar
It builds, it is simple in structure, it repeats and utilizes；
Rope guide 10 is mounted on experimental provision aluminium section bar holder, is realized the decentralization of steel wire rope 2 and cable 4.6 and is returned
It receives.
It is the structural schematic diagram of the high-low pressure pulse pair of the utility model, the high-low pressure electrode is to including with reference to figure 7
One dead ring 4.4.1, the axial direction of dead ring 4.4.1 is provided with multiple metal spoke 4.4.2, and (figure only indicates a metal spoke
Item), each metal spoke is oppositely arranged along the annular of dead ring, and two metal spokes of opposite setting one are from the cable
Access positive (+), an access cathode (-) are separated by a distance between the end of opposite two metal spokes.
When the multi-pair electrodes electricity of the utility model is crushed the drilling of drill bit 4, the pulse power 5 is powered, and the pulse power 5 has mostly logical
Road electric spark switch 5.4, can export the voltage pulse of multichannel, and high-low pressure electrode pair 4.4 is transmitted to by cable 4.6, output
Multichannel electric pulse, rising time 50ns-500ns, under the power pulse, the breakdown frequency of rock is situated between less than ionizing water
Matter, high-low pressure electric field breakdown rock generate plasma discharge channels in rock interior, and the energy on the pulse power is discharged into
In plasma discharge channel, and channel is heated.Plasma channel expanded by heating, and do work to the rock mass of surrounding.When stress is super
When crossing the stress intensity of rock, catalase realizes that multi-section broken rock drilling, drilling efficiency are high.
Embodiment 2：A kind of multi-pair electrodes electricity of the utility model is crushed drill bit and electric crushing experiment device, structure and implementation
Example 1 is identical, and when carrying out the experiment of electric pulse broken rock, control device 3 controls hydraulic power unit 7 to 6.1 fuel feeding of confining pressure cylinder, gives rock sample
6.3 add confining pressure, control device 3 to control rope guide 10 and transfer steel wire rope 2 and cable 4.6, and multi-pair electrodes electricity is crushed under drill bit 4
Drop, the control disengaging water pump 8 of control device 3 realizes that ionization aqueous medium 6.2 recycles in confining pressure cylinder component 6, when multi-pair electrodes electricity is broken
When broken drill bit 4 and rock sample 6.3 contact, the pulse power 5 discharges, and carries out bit electrode, insulating materials, drilling parameter and more
The experimental study of the rock-cracking mechanism of physical field etc..
The embodiments of the present invention are described above in conjunction with attached drawing, but the utility model is not limited to
The specific implementation mode stated, the above mentioned embodiment is only schematical, rather than restrictive, this field it is common
Technical staff is not departing from the utility model aims and scope of the claimed protection situation under the enlightenment of the utility model
Under, many forms can be also made, these are belonged within the protection of the utility model.
Claims (7)
1. a kind of multi-pair electrodes electricity is crushed drill bit, which is characterized in that including insulation tube, bit arm outer tube is arranged on insulation tube,
Insulation tube is hollow, it is described it is hollow in be disposed with cable, the cable is electrically connected and bores positioned at the multi-pair electrodes electricity is broken
Multiple high-low pressure electrodes pair of head lower end, and be pierced by from the upper end of the insulation tube, the multi-pair electrodes electricity is crushed under drill bit
End also has collets, and to may be contained on collets, collets are located at the multi-pair electrodes electricity and are crushed drill bit high-low pressure electrode
Lower end on, by bit arm outer tube with each high-low pressure electrode to keeping apart；The high-low pressure electrode is to including a dead ring, edge
The axial direction of the dead ring is provided with multiple metal spokes, and each metal spoke is oppositely arranged along the annular of dead ring, opposite
Two metal spokes being arranged one access cathode from cable access anode, one.
2. multi-pair electrodes electricity according to claim 1 is crushed drill bit, which is characterized in that the multi-pair electrodes electricity is crushed drill bit
Upper end on have lifting lug.
3. a kind of electricity crushing experiment device, which is characterized in that including：
As claim 1-2 any one of them multi-pair electrodes electricity is crushed drill bit；
Rope guide；
Steel wire rope connects the multi-pair electrodes electricity and is crushed drill bit, and drill bit is crushed to promote and transfer the multi-pair electrodes electricity；
The cable that guide roller, the steel wire rope and the multi-pair electrodes electricity are crushed drill bit is connected to institute after being oriented to roller guide
State rope guide；
The pulse power is used for output electric pulse, and electric pulse rising time is 50ns-500ns, and the pulse power is electrically connected
The cable, the cable with multichannel is respectively with each high-low pressure electrode to being connected；
Confining pressure cylinder component, including confining pressure cylinder, ionization aqueous drilling fluid, rock sample, confining pressure cylinder provide confining pressure for the rock sample,
Ionization aqueous drilling fluid provides dielectric between the high-field electrode and low-field electrode of the high-low pressure electrode pair, and carries away broken
Landwaste；
Hydraulic power unit is connected to the confining pressure cylinder component, and hydraulic pressure is provided for the confining pressure cylinder；
Water pump is passed in and out, the confining pressure cylinder component is connected to, to realize the cycle of the ionization aqueous drilling fluid；
Control device, the start and stop for controlling the hydraulic power unit, the disengaging water pump and the rope guide.
4. electricity crushing experiment device according to claim 3, which is characterized in that further include：
Experimental provision aluminium section bar holder, is used to support the hydraulic power unit and the multi-pair electrodes electricity is crushed drill bit, row's rope
Device is mounted on the experimental provision aluminium section bar holder, realizes the decentralization and recycling of steel wire rope and cable.
5. electricity crushing experiment device according to claim 3, which is characterized in that the pulse power includes power frequency electric warp
Power frequency supply, two silicon stack rectifiers, multichannel electric spark switch, storage capacitor and the height voltage cable pair obtained after boosting；
For the power frequency supply tool obtained after the boosting there are two output end, one of power frequency supply after boosting output end connects it
In a silicon stack rectifier anode, another silicon stack rectifier, storage capacitor are connected in parallel on one of silicon stack rectification
Between the cathode of device and another output end of power frequency supply, cathode and another described silicon of one of silicon stack rectifier
Heap rectifier cathode connects, each channel of multichannel electric spark switch：Each channel is connected a height voltage cable pair respectively
Afterwards and the both ends of the storage capacitor are connected in, each height voltage cable is to being electrically connected the cable.
6. electricity crushing experiment device according to claim 3, which is characterized in that when drilling, the multi-pair electrodes electricity is broken
The high-low pressure electrode pair of drill bit is contacted with rock sample to be contacted to be point-face.
7. electricity crushing experiment device according to claim 3, which is characterized in that it is how high that multi-pair electrodes electricity is crushed drill bit use
Low-field electrode is broken to discharging.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201820098015.XU CN208089227U (en) | 2018-01-22 | 2018-01-22 | Multi-electrode electric crushing drill bit and electric crushing experimental device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201820098015.XU CN208089227U (en) | 2018-01-22 | 2018-01-22 | Multi-electrode electric crushing drill bit and electric crushing experimental device |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN208089227U true CN208089227U (en) | 2018-11-13 |
Family
ID=64065995
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201820098015.XU Expired - Fee Related CN208089227U (en) | 2018-01-22 | 2018-01-22 | Multi-electrode electric crushing drill bit and electric crushing experimental device |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN208089227U (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108222839A (en) * | 2018-01-22 | 2018-06-29 | 中国地质大学（武汉） | Multi-electrode electric crushing drill bit and electric crushing experimental device |
| CN114592815A (en) * | 2022-03-31 | 2022-06-07 | 陕西太合智能钻探有限公司 | Core sampling device for directional branch drilling |
-
2018
- 2018-01-22 CN CN201820098015.XU patent/CN208089227U/en not_active Expired - Fee Related
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108222839A (en) * | 2018-01-22 | 2018-06-29 | 中国地质大学（武汉） | Multi-electrode electric crushing drill bit and electric crushing experimental device |
| CN108222839B (en) * | 2018-01-22 | 2023-08-25 | 中国地质大学（武汉） | Multi-electrode pair electrode crushing drill bit and electrode crushing experimental device |
| CN114592815A (en) * | 2022-03-31 | 2022-06-07 | 陕西太合智能钻探有限公司 | Core sampling device for directional branch drilling |
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| GR01 | Patent grant | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee | ||
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Granted publication date: 20181113 Termination date: 20190122 |