CN102733754B - Pulse plasma drilling machine system - Google Patents
Pulse plasma drilling machine system Download PDFInfo
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- CN102733754B CN102733754B CN201210216355.5A CN201210216355A CN102733754B CN 102733754 B CN102733754 B CN 102733754B CN 201210216355 A CN201210216355 A CN 201210216355A CN 102733754 B CN102733754 B CN 102733754B
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Abstract
The invention discloses a pulse plasma drilling machine system. The pulse plasma drilling machine system comprises a trigger signal generating device, a high-voltage direct-current charging unit, a photoelectric composite transmission cable, a first winch, a first fixed pulley, a high-voltage pulse forming unit, a deionized water circulation unit and a drill electrode. An aboveground device and an underground device in a circuit part are connected together through a direct-current transmission line, high-voltage pulse generated by the high-voltage pulse forming unit can be directly loaded on the drill electrode, the using of a long-distance pulse transmission line is avoided, the problem of mismatching between the impedance of the pulse transmission line and the characteristic impedance of a passageway after a rock is punctured does not exist, and thus the energy utilization efficiency and the drilling depth are greatly increased.
Description
Technical field
The invention belongs to oil-gas exploration and development technical field, relate to a kind of separated type pulsed plasma borer system.
Background technology
Along with the fast rise of petroleum resources demand, develop the active demand that advanced drilling equipment is our oil gas strategy.Traditional boring method has mechanical boring method and chemical substance blasting procedure.The former utilizes impact and the shear action of mechanical drilling tool to rock to realize the fragmentation to rock, has feature simple in structure, easy to operate, but has the shortcomings such as the easy wearing and tearing of drilling tool; Thereby the energy that the latter utilizes chemical substance to discharge in moment reaction impacts the fragmentation that realizes rock to rock, have the advantages such as simple to operate, detonation velocity is fast, but have that broken disturbance is large, poisonous and harmful substance produces and the shortcoming such as pass is irregular simultaneously.
In the face of growing drilling well demand, emerging drilling technology is continually developed out, as supercritical ultrasonics technology, electronic beam method, cavitating water jet method etc.These methods are all the methods developing for certain some specific rock, have certain effect, but also have some restrictive defects simultaneously.
Utilizing pulsed plasma to realize rock drilling well is rapidly a kind of technology developing in recent years.Its principle is: rock is placed in deionized water environment, place one or more pairs of high and low pressure electrodes on the surface of rock, when the high pressure short pulse that applies hundred nanosecond rise times is on rock, first there is electrical breakdown compared with water in rock, under the effect of repetition pulse, can realize the rapid drilling of rock.
All there is pulsed plasma drilling equipment in the countries such as current Russia, the European Community, Japan and the U.S..Pulsed plasma drilling equipment mainly comprises HVDC charge power supply, storage capacitor, switch, bit electrode, circulating water other assist drillings of unifying.The electrical block diagram of these pulsed plasma borer systems as shown in Figure 1, HVDC charhing unit charges to storage capacitor, when storage capacitor charging reaches after setting value, switch triggering conducting, produce the bit electrode that high pressure short pulse exports load to, bit electrode electric discharge causes that rock punctures and occurs broken.HVDC charhing unit, storage capacitor and switch are all positioned over aboveground, are called uphole equipment; Bit electrode is placed on down-hole, is called underground equipment.Uphole equipment and underground equipment link together by pulse transmission line.The structure of the design underground equipment of this structure is relatively simple, drilling process is simple, but the problem existing is: after rock punctures, characteristic impedance is less than 1 ohm of (Scott J. MacGregor et al, Plasma Channel Miniature Hole Drilling Technology[J], IEEE Transactions on plasma science, 2004:2055-2061), the characteristic impedance of supposing transmission line is Z, after rock punctures, the inner plasma channel that forms, in passage, the characteristic impedance of plasma is R, the energy efficiency obtaining in load is so:
Wherein,
for the energy efficiency obtaining in load, the characteristic impedance that Z is transmission line, R is that rock punctures the rear inner characteristic impedance that forms plasma channel.If obtain higher energy efficiency, characteristic impedance when the desirable characteristic impedance of pulse transmission line will puncture with rock equates.And existing burst transmissions cable (RG215, RG218 etc.), its characteristic impedance is generally 50 ohm even higher, domestic is 10 ohm by Qingdao Haiyang develop for the minimum characteristic impedance of the coaxial water cable of pulsed plasma borer system at present, under the high like this characteristic impedance of transmission line, load rock is difficult to obtain higher energy efficiency.For this situation, many research institutions have proposed new circuit structure and have solved this resistance matching problem, the people such as J Biela have proposed solid-state switch power supply (J. Biela et al, Solid State Modulator for Plasma Channel Drilling[J], IEEE Transactions on plasma science, 2009:1093-1099), the position sensing that this method is placed actuating coil, is difficult to meet this requirement in real work.Professor Yan Keping of Zhejiang University has developed a kind of assembled pulse power supply (ZL 2,009 2 0295616.0) based on pulse forming network, and this method can better realize the coupling of impedance, still has problems but solve in long range pulse transmission.
In addition, along with the increase of burst transmissions cable length, the steepness of pulse front edge can be because the meeting that affects of stray inductance or stray capacitance further declines, in the time that the rising front of voltage does not reach requiring of hundred nanoseconds, rig is with regard to cisco unity malfunction, and Here it is that conventional plasma rig can not be realized one of reason of degree of depth drilling well.
Summary of the invention
The object of this invention is to provide a kind of new pulsed plasma borer system.
For achieving the above object, the technical solution used in the present invention is: pulsed plasma borer system of the present invention comprises triggering signal generating means, HVDC charhing unit, photoelectricity multiplexing of transmission cable, the first winch, the first fixed pulley, high-voltage pulse forming unit, deionized water cycling element and bit electrode.
High-voltage pulse forming unit comprises high energy storage density electric capacity, switch and leakproof fuel cell, the casing of leakproof fuel cell is made by conductive material, in leakproof fuel cell, fill transformer oil, high energy storage density electric capacity and switch are immersed in transformer oil, and the low-pressure end of high energy storage density electric capacity is electrically connected with the casing of leakproof fuel cell;
The signal output part of triggering signal generating means is connected with the input of the optical fiber of photoelectricity multiplexing of transmission cable; The high-voltage output end of described HVDC charhing unit is electrically connected with the high voltage input terminal of the HVDC Transmission line of photoelectricity multiplexing of transmission cable, and the low-voltage output of HVDC charhing unit is shared the same light and replied the low pressure input electrical connection of the HVDC Transmission line that closes transmission yarn by cable; Photoelectricity multiplexing of transmission cable is sequentially after pile warp the first winch, the first fixed pulley, the high-voltage output end of the HVDC Transmission line of photoelectricity multiplexing of transmission cable is electrically connected with the high-pressure side of high energy storage density electric capacity, the anode of switch simultaneously, the low-voltage output of HVDC Transmission line and the casing of leakproof fuel cell of photoelectricity multiplexing of transmission cable are connected, and the output of optical fiber and the trigger electrode of switch of photoelectricity multiplexing of transmission cable are connected.
Bit electrode comprises high-field electrode and earthing electrode, between high-field electrode and earthing electrode, form cavity, the lower surface of high-field electrode and earthing electrode all contacts with rock, high-field electrode is connected with the cathodic electricity of the switch of high-voltage pulse forming unit, and earthing electrode is electrically connected with the casing of the leakproof fuel cell of high-voltage pulse forming unit;
Deionized water cycling element comprises purifier, reservoir, intake pump, water inlet pipe, gutter, drainage pump, the second winch, the second fixed pulley, the 3rd winch and the 3rd fixed pulley, the delivery port of purifier is communicated with the water inlet of reservoir, the delivery port of reservoir is connected with the water inlet of intake pump, and the delivery port of intake pump is communicated with the water inlet of water inlet pipe; Water inlet pipe successively after pile warp the 3rd winch, the 3rd fixed pulley its water side be fixedly connected with the earthing electrode of bit electrode, the delivery port of water inlet pipe is communicated with the cavity between high-field electrode and earthing electrode; The water inlet of gutter is communicated with the cavity between high-field electrode and earthing electrode, and the water inlet end of gutter is fixedly connected with earthing electrode; Gutter sequentially on pile warp the second fixed pulley, the second winch after, the delivery port of gutter is communicated with the water inlet of drainage pump, the delivery port of drainage pump is communicated with the water inlet of purifier.
Further, high-voltage pulse forming unit of the present invention and bit electrode are placed in down-hole.
Further, the payingoff speed of photoelectricity multiplexing of transmission cable of the present invention, water inlet pipe and gutter is identical.
Further, the deionization electrical conductivity of water that the present invention obtains through described purifier processing is less than or equal to 100 μ S/cm.
Further, the output voltage of HVDC charhing unit of the present invention is more than or equal to 30 kV, and the rising front of the output voltage of the switch of described high-voltage pulse forming unit is less than 100 ns.
Further, photoelectricity multiplexing of transmission cable of the present invention comprises HVDC Transmission line and signal transmission fiber, HVDC Transmission line structure is from outside to inside followed successively by coaxial cable shield, outer conductor layer, insulating layer and inner conductor layer, optical fiber is at the side of HVDC Transmission line, and the skin of optical fiber is provided with optical fiber screen layer.
Compared with prior art, the technique effect that the present invention is useful is:
(1) structure based on borer system of the present invention, the high pressure short pulse that uses high-voltage pulse forming unit to produce can directly be carried in bit electrode, avoid using long range pulse transmission line, do not exist impedance and the rock of pulse transmission line to puncture the problem of the characteristic impedance mismatch of rear passage, thereby greatly improved energy utilization efficiency.
(2), owing to not using pulse transmission line, just there is not the problem slowing down along with the increase voltage rising front of drilling depth yet, thereby improved the degree of depth of drilling well.
Accompanying drawing explanation
Fig. 1 is the electrical block diagram of conventional pulsed plasma borer system in prior art;
Fig. 2 is the circuit structure block diagram of pulsed plasma borer system of the present invention;
Fig. 3 is the structural representation of pulsed plasma borer system of the present invention;
Fig. 4 is the circuit theory diagrams of a kind of embodiment of pulsed plasma borer system of the present invention;
Fig. 5 is the structural representation of a kind of embodiment of the photoelectricity multiplexing of transmission cable of pulsed plasma borer system of the present invention.
The specific embodiment
As shown in Figure 3, pulsed plasma well system of the present invention mainly comprises triggering signal generating means 2, HVDC charhing unit 31, photoelectricity multiplexing of transmission cable 5, the first winch 4, the first fixed pulley 6, high-voltage pulse forming unit, deionized water cycling element and bit electrode.
Photoelectricity multiplexing of transmission cable 5 shown in Fig. 5 is made up of HVDC Transmission line and signal transmission fiber 10, and HVDC Transmission line structure is from outside to inside followed successively by coaxial cable shield 25, outer conductor layer 26, insulating layer 27 and inner conductor layer 28.Optical fiber 10 is at the side of HVDC Transmission line.The skin of optical fiber 10 is also provided with optical fiber screen layer 29, and optical fiber screen layer 29 provides the protection in electromagnetic shielding and frame for movement for optical fiber 10.HVDC Transmission line and optical fiber 10 form photoelectricity multiplexing of transmission cable 5 by having fire-retardant total sheath 24 envelopes that block water.Reply by cable and close transmission yarn 5 transmission of high-voltage direct current electricity and optical signal simultaneously.
High-voltage pulse forming unit comprises high energy storage density electric capacity 11, switch 12 and leakproof fuel cell 9.The casing of leakproof fuel cell 9 is made by conductive material, in leakproof fuel cell 9, fills transformer oil, and high energy storage density electric capacity 11 and switch 12 are immersed in transformer oil, and the low-pressure end of high energy storage density electric capacity 11 is electrically connected with the casing of leakproof fuel cell 9.
The signal output part of triggering signal generating means 2 is connected with the input of the optical fiber of photoelectricity multiplexing of transmission cable 5.
The high-voltage output end of HVDC charhing unit 31 is electrically connected with the high voltage input terminal of the HVDC Transmission line of photoelectricity multiplexing of transmission cable 5, and the low-voltage output of HVDC charhing unit 31 is shared the same light and replied the low pressure input electrical connection of the HVDC Transmission line that closes transmission yarn 5 by cable.As the preferred embodiment of the present invention, the output voltage of HVDC charhing unit 31 is more than or equal to 30 kV, the rising front of the output voltage of the switch 12 of high-voltage pulse forming unit is less than 100 ns, and pulsed plasma rig has higher rock-breaking efficiency with this understanding.
Photoelectricity multiplexing of transmission cable 5 is sequentially after pile warp the first winch 4, the first fixed pulley 6, the high-voltage output end 17 of the HVDC Transmission line of photoelectricity multiplexing of transmission cable 5 is electrically connected with the high-pressure side of high energy storage density electric capacity 11, the anode of switch 12 simultaneously, the low-voltage output of the HVDC Transmission line of photoelectricity multiplexing of transmission cable 5 is connected with the casing of leakproof fuel cell 9, and the output of the optical fiber 10 of photoelectricity multiplexing of transmission cable 5 is connected with the trigger electrode of switch 12.
Bit electrode comprises high-field electrode 14 and earthing electrode 13, between high-field electrode 14 and earthing electrode 13, form cavity 16, the lower surface of high-field electrode 14 and earthing electrode 13 all contacts with rock 15, high-field electrode 14 is connected with the cathodic electricity of the switch 12 of high-voltage pulse forming unit, and earthing electrode 13 is electrically connected with the casing of the leakproof fuel cell 9 of high-voltage pulse forming unit.
Deionized water cycling element comprises purifier 23, reservoir 22, intake pump 21, water inlet pipe 18, gutter 8, drainage pump 1, the second winch 3, the second fixed pulley 7, the 3rd winch 20 and the 3rd fixed pulley 19.
The delivery port of purifier 23 is communicated with the water inlet of reservoir 22, and the delivery port of reservoir 22 is connected with the water inlet of intake pump 21, and the delivery port of intake pump 21 is communicated with the water inlet of water inlet pipe 18.As the preferred embodiment of the present invention, process through purifier 23 the deionization electrical conductivity of water obtaining and be less than or equal to 100 μ S/cm, the deionized water of low conductivity can reduce water power and lead the energy loss causing, and plasma channel occurs in rock interior rather than water when high and low pressure electrode discharge.
The first winch 4 is controlled the payingoff speed of photoelectricity multiplexing of transmission cable 5, and the second winch 3 is controlled the payingoff speed of gutter 8, and the 3rd winch 20 is controlled the payingoff speed of water inlet pipe 18.The payingoff speed of photoelectricity multiplexing of transmission cable 5, water inlet pipe 18 and gutter 8 is consistent.
From the position of placing, triggering signal generating means 2, HVDC charhing unit 31, reservoir 22, intake pump 21, drainage pump 1, the first winch 4, the second winch 3, the 3rd winch 20, the first fixed pulley 6, the second fixed pulley 7 and the 3rd fixed pulley 19 are positioned over aboveground, are uphole equipment; High-voltage pulse forming unit and bit electrode are positioned over down-hole, are underground equipment.
As shown in Figure 2, the circuit part of pulsed plasma borer system of the present invention mainly comprises HVDC charhing unit, high energy storage density electric capacity and switch.Different from traditional pulsed plasma borer system: the present invention is positioned over HVDC charhing unit aboveground, and high energy storage density electric capacity 11, switch 12 and bit electrode are positioned over down-hole.Uphole equipment (HVDC charhing unit) in circuit part and underground equipment (high energy storage density electric capacity 11, switch 12 and bit electrode) link together by DC link.Referring to Fig. 4, as a kind of specific embodiment of the present invention, three-phase alternating current becomes high voltage direct current after transformer T boosts after rectifier bridge rectification, and this part is HVDC charhing unit, and this part is placed on aboveground.HVDC charhing unit connects with high energy storage density capacitor C by HVDC Transmission line, and galvanic high-pressure side is with the high-pressure side electrical connection of high energy storage density capacitor C, and galvanic low-pressure end is with the low-pressure end electrical connection of high energy storage density capacitor C.The anode of switch S is with the high-pressure side electrical connection of high energy storage density capacitor C, the anodic bonding of the negative electrode of switch S and load R.In discharge process, shake the impact that electric current causes switch S in the other direction, be generally parallel with diode at the two ends of switch S, the anode of diode connects with the negative electrode of switch S, and the negative electrode of diode is with the anodic bonding of switch.Switch S is receiving conducting after triggering signal, and the high-voltage pulse of generation is directly carried in bit electrode.The pulse transmission line that pulsed plasma borer system of the present invention has used DC link to replace traditional pulsed plasma rig to use, the problem such as voltage rising edge steepness reduction when DC link does not just exist the voltage transmission inefficiency that causes because of impedance mismatch and long Distance Transmission.It is worth mentioning that, due to the limited space in down-hole, the electric capacity that the storage capacitor of use is high energy storage density.The electric capacity of high energy storage density and switch are got up with transformer oil oil sealing, play the effect of electrical apparatus insulation
The pulsed plasma rig course of work of the present invention is: after the intake pump 21 of deionized water cycling element starts, intake pump 21 is pumped into deionized water clean in reservoir 22 in water inlet pipe 18, water inlet pipe 18 is delivered to clean deionized water in the cavity 16 between high-field electrode 14 and the earthing electrode 13 of bit electrode, and high-field electrode 14 and earthing electrode 13 are immersed in deionized water environment.HVDC charhing unit 31 converts single-phase or three-phase alternating current to direct current after the rectification of boosting, and by the HVDC Transmission line of photoelectricity multiplexing of transmission cable 5, direct current is transferred to the high energy storage density electric capacity 11 of high-voltage pulse forming unit.Triggering signal generating means 2 according to user set produce for make that switch 12 moves optical signal, through the optical fiber 10 of photoelectricity multiplexing of transmission cable 5, triggering signal is transferred to the switch 12 of high-voltage pulse forming unit, switch 12 is accepted conducting after triggering signal, the high-voltage pulse producing is carried in bit electrode, high-field electrode 14 and the earthing electrode 13 of bit electrode are discharged, cause the electrical breakdown of rock 15, rock 15 microexplosions also occur broken.Under the effect of the drainage pump 1 of deionized water cycling element, fragmented rock enters into gutter 8 and enters into purifier 23 with deionized water.After purifier 23 is processed, rock chip is got rid of outside body of drill, and clean deionized water flow into reservoir, and enters into next circulation.
Claims (6)
1. a pulsed plasma borer system, is characterized in that: comprise triggering signal generating means (2), HVDC charhing unit (31), photoelectricity multiplexing of transmission cable (5), the first winch (4), the first fixed pulley (6), high-voltage pulse forming unit, deionized water cycling element and bit electrode;
Described high-voltage pulse forming unit comprises high energy storage density electric capacity (11), switch (12) and leakproof fuel cell (9), the casing of leakproof fuel cell (9) is made by conductive material, leakproof fuel cell fills transformer oil in (9), high energy storage density electric capacity (11) and switch (12) are immersed in transformer oil, and the low-pressure end of high energy storage density electric capacity (11) is electrically connected with the casing of leakproof fuel cell (9);
The signal output part of triggering signal generating means (2) is connected with the input of the optical fiber (10) of photoelectricity multiplexing of transmission cable (5); The high-voltage output end of described HVDC charhing unit (31) is electrically connected with the high voltage input terminal of the HVDC Transmission line of photoelectricity multiplexing of transmission cable (5), and the low-voltage output of HVDC charhing unit (31) is shared the same light and replied the low pressure input electrical connection of the HVDC Transmission line that closes transmission yarn (5) by cable; Photoelectricity multiplexing of transmission cable (5) is sequentially after pile warp the first winch (4), the first fixed pulley (6), the high-voltage output end (17) of the HVDC Transmission line of photoelectricity multiplexing of transmission cable (5) is electrically connected with the high-pressure side of high energy storage density electric capacity (11), the anode of switch (12) simultaneously, the low-voltage output of the HVDC Transmission line of photoelectricity multiplexing of transmission cable (5) is connected with the casing of leakproof fuel cell (9), and the output of the optical fiber (10) of photoelectricity multiplexing of transmission cable (5) is connected with the trigger electrode of switch (12);
Described bit electrode comprises high-field electrode (14) and earthing electrode (13), between high-field electrode (14) and earthing electrode (13), form cavity (16), the lower surface of high-field electrode (14) and earthing electrode (13) all contacts with rock (15), high-field electrode (14) is connected with the cathodic electricity of the switch (12) of high-voltage pulse forming unit, and earthing electrode (13) is electrically connected with the casing of the leakproof fuel cell (9) of high-voltage pulse forming unit;
Described deionized water cycling element comprises purifier (23), reservoir (22), intake pump (21), water inlet pipe (18), gutter (8), drainage pump (1), the second winch (3), the second fixed pulley (7), the 3rd winch (20) and the 3rd fixed pulley (19), the delivery port of purifier (23) is communicated with the water inlet of reservoir (22), the delivery port of reservoir (22) is connected with the water inlet of intake pump (21), and the delivery port of intake pump (21) is communicated with the water inlet of water inlet pipe (18); Water inlet pipe (18) is sequentially after pile warp the 3rd winch (20), the 3rd fixed pulley (19), the water side of water inlet pipe (18) is fixedly connected with the earthing electrode (13) of bit electrode, and the delivery port of water inlet pipe (18) is communicated with the cavity (16) between high-field electrode (14) and earthing electrode (13); The water inlet of gutter (8) is communicated with the cavity (16) between high-field electrode (14) and earthing electrode (13), and the water inlet end of gutter (8) is fixedly connected with earthing electrode (13); Gutter (8) sequentially pile warp the second fixed pulley (7), the second winch (3) upper after, the delivery port of gutter (8) is communicated with the water inlet of drainage pump (1), the delivery port of drainage pump (1) is communicated with the water inlet of purifier (23).
2. pulsed plasma borer system according to claim 1, is characterized in that: described high-voltage pulse forming unit and bit electrode are placed in down-hole.
3. pulsed plasma borer system according to claim 1, is characterized in that: described photoelectricity multiplexing of transmission cable (5), water inlet pipe (18) are identical with the payingoff speed of gutter (8).
4. pulsed plasma borer system according to claim 1, is characterized in that: process through described purifier (23) the deionization electrical conductivity of water obtaining and be less than or equal to 100 μ S/cm.
5. pulsed plasma borer system according to claim 1, it is characterized in that: the output voltage of described HVDC charhing unit (31) is more than or equal to 30 kV, the rising front of the output voltage of the switch (12) of described high-voltage pulse forming unit is less than 100 ns.
6. according to the pulsed plasma borer system described in any one in claim 1 to 5, it is characterized in that: described photoelectricity multiplexing of transmission cable comprises HVDC Transmission line and signal transmission fiber, HVDC Transmission line structure is from outside to inside followed successively by coaxial cable shield, outer conductor layer, insulating layer and inner conductor layer, optical fiber is at the side of HVDC Transmission line, and the skin of optical fiber is provided with optical fiber screen layer.
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| CN106703682B (en) * | 2017-03-17 | 2018-10-16 | 吉林大学 | A kind of plasma surges dynamic rotation drilling tool |
| CN108661554B (en) * | 2018-05-11 | 2019-08-30 | 东北石油大学 | Based on plasma channel and mechanical drilling tool combined unit and its boring method |
| CN109577859B (en) * | 2018-07-03 | 2020-04-07 | 西南石油大学 | Continuous tube high-voltage electric pulse-mechanical composite rock breaking drilling method |
| CN109577864B (en) * | 2018-07-03 | 2020-04-07 | 西南石油大学 | Electrode drill bit for coiled tubing high-voltage electric pulse-mechanical composite drilling |
| CN112343510B (en) * | 2020-11-04 | 2023-01-24 | 北京三一智造科技有限公司 | Construction method for crushing rock and coring by using plasma pulse |
| CN112855015A (en) * | 2021-01-27 | 2021-05-28 | 张庆豫 | High-voltage electric pulse assisted rock breaking and drilling system and method |
| CN113187398B (en) * | 2021-06-02 | 2023-06-02 | 辽宁石油化工大学 | Novel magnetic continuous pulse plasma drill bit and drilling method |
| CN113323661B (en) * | 2021-06-11 | 2022-11-04 | 北京三一智造科技有限公司 | Pulse drilling device |
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| CN2188647Y (en) * | 1994-03-06 | 1995-02-01 | 黄尔玉 | Plasma flame drilling machine |
| FR2927936B1 (en) * | 2008-02-21 | 2010-03-26 | Vam Drilling France | DRILL LINING ELEMENT, DRILLING ROD AND CORRESPONDING DRILL ROD TRAIN |
| CN201391228Y (en) * | 2009-04-21 | 2010-01-27 | 邹城市东远石油机械有限公司 | High wear resistance bent housing of screw drill |
| CN102176051B (en) * | 2011-01-24 | 2013-06-05 | 浙江大学 | Deep-towed split-type pulse plasma source system |
| CN202673140U (en) * | 2012-06-28 | 2013-01-16 | 浙江大学 | Pulse plasma drilling machine system |
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