CN103556944B - For soft projecting coal bed creep into double-deck in the anti-blocking drilling tool of deslagging and using method thereof - Google Patents
For soft projecting coal bed creep into double-deck in the anti-blocking drilling tool of deslagging and using method thereof Download PDFInfo
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- CN103556944B CN103556944B CN201310566830.6A CN201310566830A CN103556944B CN 103556944 B CN103556944 B CN 103556944B CN 201310566830 A CN201310566830 A CN 201310566830A CN 103556944 B CN103556944 B CN 103556944B
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- 238000005553 drilling Methods 0.000 title claims abstract description 174
- 239000003245 coal Substances 0.000 title claims abstract description 38
- 238000000034 method Methods 0.000 title claims abstract description 19
- 238000007789 sealing Methods 0.000 claims abstract description 24
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 22
- 238000005520 cutting process Methods 0.000 claims abstract description 19
- 238000009434 installation Methods 0.000 claims abstract description 15
- 230000008602 contraction Effects 0.000 claims abstract description 6
- 239000011159 matrix material Substances 0.000 claims description 6
- 230000001360 synchronised effect Effects 0.000 claims description 6
- 239000000956 alloy Substances 0.000 claims description 3
- 229910045601 alloy Inorganic materials 0.000 claims description 3
- 230000008878 coupling Effects 0.000 claims description 3
- 238000010168 coupling process Methods 0.000 claims description 3
- 238000005859 coupling reaction Methods 0.000 claims description 3
- 239000007787 solid Substances 0.000 claims description 3
- 239000000428 dust Substances 0.000 abstract description 3
- 230000015572 biosynthetic process Effects 0.000 abstract description 2
- 230000000903 blocking effect Effects 0.000 description 8
- 238000005516 engineering process Methods 0.000 description 5
- 238000005086 pumping Methods 0.000 description 5
- 238000010276 construction Methods 0.000 description 3
- 238000000605 extraction Methods 0.000 description 3
- 239000012530 fluid Substances 0.000 description 3
- 241000167854 Bourreria succulenta Species 0.000 description 2
- 241001074085 Scophthalmus aquosus Species 0.000 description 2
- 235000019693 cherries Nutrition 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 238000004519 manufacturing process Methods 0.000 description 2
- 238000009825 accumulation Methods 0.000 description 1
- 238000009412 basement excavation Methods 0.000 description 1
- 239000003818 cinder Substances 0.000 description 1
- 238000005253 cladding Methods 0.000 description 1
- 230000006378 damage Effects 0.000 description 1
- 230000008014 freezing Effects 0.000 description 1
- 238000007710 freezing Methods 0.000 description 1
- 230000035699 permeability Effects 0.000 description 1
- 231100000572 poisoning Toxicity 0.000 description 1
- 230000000607 poisoning effect Effects 0.000 description 1
- 238000000518 rheometry Methods 0.000 description 1
- 239000002893 slag Substances 0.000 description 1
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Abstract
The invention discloses a kind of for soft projecting coal bed creep into double-deck in the anti-blocking drilling tool of deslagging and using method thereof, comprise rotatory sealing water supply installation or air supply device, double-deck in the anti-blocking drilling rod of deslagging, central backflow drill bit, rotatory sealing water supply installation or air supply device are connected with the anti-blocking drilling rod of deslagging in the bilayer on rig, and central backflow drill bit is arranged on the front end of the double-deck interior anti-blocking drilling rod of deslagging.Its using method: start drilling system, distinguished and admirable or current enter the anti-blocking drilling rod outer layer channel of double-deck interior deslagging and arrive foot of hole, the drilling cuttings that drill bit is broken coal formation by distinguished and admirable or current returns out along the double-deck interior anti-blocking drilling rod inner-layer channel of deslagging the slagging deduster entering and be connected with drilling rod afterbody, completes deslagging and dedusting.The present invention is novel in design, deslagging completes in drilling rod cavity, and can effectively avoid boring contraction, hole wall unstable failure on the impact in hole drilling deslagging space, deslagging completes at drilling rod inner-layer channel, make dedusting more effective, achieve creep into, anti-collapse, dust removal integrated operation.
Description
Technical field
The invention belongs to the projecting coal bed mash gas pumping drilling construction technical field in colliery, be specifically related to a kind of for soft projecting coal bed creep into double-deck in the anti-blocking drilling tool of deslagging and using method thereof.
Background technology
Mine gas is administered and is relied on gas pumping technology, affect by coal seam geological condition, safe and reliable surface well extraction application is restricted, current, gas pumping still with well work gas pumping for major measure, and gas pumping is premised on hole creating technology, for a long time, drill of protrusive coal seam technology is a gas control difficult problem of generally acknowledging both at home and abroad.Projecting coal bed drilling construction creeps into difficulty the most with soft seam especially, affect by geostatic stress, gas pressure, cherry coal boring is shunk serious, and local easily unstable failure forms collapse hole, in drilling process, bit freezing, breaking of rod phenomenon take place frequently, drilling depth is shallow, and drilling efficiency is low, becomes porosity low, direct extraction scope and the extraction efficiency affecting gas, the production efficiency in remote-effects coal seam, safety in production and economic benefit.China most projecting coal bed be the relatively poor soft seam of gas permeability, the research of drilling in coal process system is one of study hotspot of gas preventing and control technical field.Drilling tool conventional at present, deslagging power is generally fluid deslagging mode and mechanical deslagging mode, because fluid deslagging efficiency is high, therefore, apply comparatively extensive in soft seam creeps into, fluid deslagging enters at the bottom of drilling hole from drilling rod cavity usually, deslagging space is the annulus between borehole wall and drilling rod, therefore, hole wall deformation and the situation of destruction, comparatively large to the variable effect of deslagging space size, boring easily blocks, affect comparatively large on the degree of depth of holing and drilling efficiency, this is also the basic reason that cherry coal creeps into difficulty.Therefore, soft seam is crept into, answer drilling tool and dreg removing system two technological layers in surrounding hole, develop drilling tool and drilling process system in a kind of new hole.
Summary of the invention
The present invention is in order to solve weak point of the prior art, provide a kind of for soft projecting coal bed creep into double-deck in the anti-blocking drilling tool of deslagging and using method thereof, this drilling process system makes air feed or water supply, deslagging completes in drilling rod cavity, deslagging completes at drilling rod inner-layer channel, can effectively avoid boring contraction, hole wall unstable failure on the impact in hole drilling deslagging space, meanwhile, make dedusting effectively more convenient, achieve creep into, anti-collapse, dust removal integrated operation.
For solving the problems of the technologies described above, the present invention adopts following technical scheme: for soft projecting coal bed creep into double-deck in the anti-blocking drilling tool of deslagging, comprise the double-deck interior anti-blocking drilling rod of deslagging, central backflow drill bit, rotatory sealing water supply installation or air supply device, described rotatory sealing water supply installation or air supply device are connected with the anti-blocking drilling rod of deslagging in the bilayer on rig, central backflow drill bit be arranged on double-deck in the front end of the anti-blocking drilling rod of deslagging, in double-deck, the anti-blocking drilling rod of deslagging is made up of outer drilling rod body, inner connection tube and the antipriming pipe that is welded on inner connection tube inwall.
Described outer drilling rod body is made up of male connection, the body of rod and female adapter, and male connection, female adapter can be designed to taper screw thread or flat button, and outer drilling rod external surface is set to light face, helical groove or spiral ridge.
Described inner connection tube structure and outer drilling rod body similar, joint connects can be designed to screwed connection or socket connection, and its external diameter is less than outer drilling rod body internal diameter, ensure to be formed between inner connection tube external diameter and outer drilling rod body internal diameter the outer layer channel that air-flow or current enter, the hollow cavity of inner connection tube is the inner-layer channel of drilling system, and drill bit breaks the drilling cuttings that coal formed and relies on distinguished and admirable or current to discharge along inner-layer channel.
Described antipriming pipe is welded on the inwall of inner connection tube, and its diameter is less, and arranges aperture at spacing intervals.
Described central backflow drill bit is made up of the outer drilling rod body female adapter of drill bit, the female adapter of through hole core pipe, carcass and alloy blade, and joint can be designed to taper screw thread or flat button.The outer drilling rod body female adapter of drill bit is connected with the anti-blocking drilling rod male connection of deslagging in bilayer, and the outer drilling rod body female adapter of drill bit connects with bit matrix and forms the inlet channel identical with the anti-blocking drilling rod of deslagging in bilayer.The female adapter of through hole core pipe is arranged at bit central one end inner connection tube and connects, and the other end, along being connected with bit matrix central through hole, forms central backflow passage.
Described rotatory sealing water supply installation or air supply device are made up of deslagging core union, rotation seal joint and sealing air guide room, deslagging core pipe is connected with inner connection tube, deslagging core pipe non rotating in work, axis of rotation is connected with outer drilling rod body and keeps synchronous rotary, realize rotary drilling, sealing one end, air guide room connecting downhole airduct or water pipe, realize air-flow or current enter along drilling rod outer layer channel, and the drilling cuttings of Gas-solid Coupling is discharged along inner-layer channel.
For a soft projecting coal bed using method of creeping into the double-deck interior anti-blocking drilling tool of deslagging, comprise the following steps:
1.. complete rig, drilling tool and dreg removing system thereof and install and be connected, utilize rotatory sealing water supply installation or air supply device that distinguished and admirable or current are sent into the double-deck interior anti-blocking drilling rod outer layer channel of deslagging, deslagging core pipe non rotating in work, axis of rotation is connected with outer drilling rod body and keeps synchronous rotary, realize rotary drilling, sealing one end, air guide room connection airduct or water pipe, realize air-flow or current enter along drilling rod outer layer channel;
2.. distinguished and admirable or current with pressure arrive at the bottom of hole by central backflow drill bit, drill bit is broken the double-deck interior anti-blocking drilling rod inner-layer channel of deslagging of drilling cuttings feeding that coal is formed, which is contrary with the deslagging route that routine is crept into, deslagging completes in drilling rod cavity, can effectively avoid boring contraction, hole wall unstable failure on the impact in hole drilling deslagging space;
3.. drill bit is broken drilling cuttings that coal formed and returns out to enter along the anti-blocking drilling rod inner-layer channel of deslagging in double-deck and is connected slagging deduster with drilling rod afterbody by distinguished and admirable or current, and complete deslagging and dedusting, drilling cuttings is migrated at enclosure space, avoids gas leakage and leakage dirt passage.
Accompanying drawing explanation
Fig. 1 is the structural representation of duty of the present invention;
Fig. 2 is the three-dimensional structure sectional view of the anti-blocking drilling rod embodiment one of deslagging in bilayer of the present invention;
Fig. 3 is the axial sectional view of the embodiment of the present invention one;
Fig. 4 is A-A sectional view in the middle of Fig. 3;
Fig. 5 is central backflow drill bit structure sectional view of the present invention;
Fig. 6 is rotatory sealing water supply installation of the present invention or air supply device structure chart;
Deslagging principle schematic when Fig. 7 is the invention process;
Prevent drilling rod inner-layer channel that blocking principle schematic occurs when Fig. 8 is the invention process;
Fig. 9 is the three-dimensional structure sectional view of the anti-blocking drilling rod embodiment two of deslagging in bilayer of the present invention;
Figure 10 is the axial sectional view of the embodiment of the present invention two;
Figure 11 is B-B sectional view in the middle of Figure 10;
Figure 12 is the three-dimensional structure sectional view of the anti-blocking drilling rod embodiment three of deslagging in bilayer of the present invention;
Figure 13 is the axial sectional view of the embodiment of the present invention three;
Figure 14 is C-C sectional view in the middle of Figure 13.
Detailed description of the invention
Embodiment one: as shown in Fig. 1 ~ Fig. 8, the present invention's one be used for soft projecting coal bed creep into double-deck in the anti-blocking drilling tool of deslagging and using method thereof, comprise the double-deck interior anti-blocking drilling rod 5 of deslagging, central backflow drill bit 6, rotatory sealing water supply installation or air supply device 3, described rotatory sealing water supply installation or air supply device 3 are connected with the anti-blocking drilling rod 5 of deslagging in the bilayer on rig, and central backflow drill bit 6 is arranged on the front end of the double-deck interior anti-blocking drilling rod 5 of deslagging.In double-deck, the anti-blocking drilling rod of deslagging 5 is made up of outer drilling rod body 9, inner connection tube 10 and the antipriming pipe 11 that is welded on inner connection tube inwall.Outer drilling rod body is made up of female adapter 12, the body of rod 13 and male connection 14, and male connection, female adapter can be designed to taper screw thread or flat button.Inner connection tube 10 structure and outer drilling rod body 9 similar, joint connects can be designed to screwed connection or socket connection, and its external diameter is less than outer drilling rod body internal diameter, ensure to be formed between inner connection tube 10 external diameter and outer drilling rod body 9 internal diameter the outer layer channel that air-flow or current enter, the hollow cavity of inner connection tube 10 is the inner-layer channel of drilling system, and drill bit breaks the drilling cuttings that coal formed and relies on distinguished and admirable or current to discharge along inner-layer channel.Antipriming pipe 11 is welded on the inwall of inner connection tube 10, and its diameter is less, and arranges aperture 17 at spacing intervals.Central backflow drill bit 6 is made up of the outer drilling rod body female adapter 21 of drill bit, through hole core pipe female adapter 22, carcass 23 and alloy blade 24, and joint can be designed to taper screw thread or flat button.The outer drilling rod body female adapter 21 of drill bit is connected with outer drilling rod body 9 male connection 14, and the outer drilling rod body female adapter 21 of drill bit connects with bit matrix 23 and forms the inlet channel 19 identical with the anti-blocking drilling rod of deslagging in bilayer.Through hole core pipe female adapter 22 is arranged at bit central one end inner connection tube 10 and connects, and the other end is connected with bit matrix 23 central through hole, and slag passage 20 is returned at formation center.Rotatory sealing water supply installation or air supply device 3 are made up of deslagging core union 25, rotation seal joint 26 and sealing air guide room 27, deslagging core union 25 is connected with inner connection tube 10, deslagging core pipe non rotating in work, rotation seal joint 26 is connected with the anti-blocking drilling rod of deslagging in bilayer 5 outer drilling rod body female adapter 12 and keeps synchronous rotary, realize rotary drilling, sealing one end, air guide room 27 connecting downhole airduct or water pipe, realize air-flow or current enter along drilling rod outer layer channel 15, the drilling cuttings of Gas-solid Coupling is discharged along inner-layer channel 16.
Introduce the concrete using method of the embodiment of the present invention one below:
With reference to Fig. 1, Fig. 7, complete rig, drilling tool and dreg removing system thereof and install and be connected, first utilize rotatory sealing water supply installation or air supply device 3 that distinguished and admirable or current are sent into double-deck interior deslagging anti-blocking drilling rod 5 outer layer channel 15.Inner connection tube 10 non rotating in work, rotation seal joint 26 is connected with the anti-blocking drilling rod 5 of deslagging in bilayer and keeps synchronous rotary, realizes rotary drilling, and sealing one end, air guide room 27 connection airduct or water pipe, realize air-flow or current enter along drilling rod outer layer channel 15;
Distinguished and admirable or current with pressure arrive at the bottom of hole by central backflow drill bit 6, drill bit is broken the double-deck interior anti-blocking drilling rod inner-layer channel 16 of deslagging of drilling cuttings feeding that coal is formed, which is contrary with the deslagging route that routine is crept into, deslagging completes in drilling rod cavity, can effectively avoid boring contraction, hole wall unstable failure on the impact in hole drilling deslagging space;
Drill bit is broken drilling cuttings that coal formed and returns out to enter along the anti-blocking drilling rod inner-layer channel 16 of deslagging in double-deck and be connected slagging deduster 1 with drilling rod afterbody by distinguished and admirable or current, complete deslagging and dedusting, drilling cuttings is migrated at enclosure space, avoid gas leakage and leak dirt passage, arrange simply due to external, the dust arrester that application is conventional, just can realize high-effective dust-removing.
Introduce the anti-drilling hole plug principle of the embodiment of the present invention one drilling tool below:
With reference to Fig. 7, Fig. 8, projecting coal bedly to creep into, after boring excavation for soft, coal rheology phenomenon is serious, the easy unstable failure of borehole wall, and short time internal drilling shrinkage strain is serious, drilling cuttings is easily formed in hole to be piled up, in hole, deslagging space easily blocks, and when forming blocking section in hole, boring will lose slagging channel, creep into and will be forced to stop, blocking section is not dredged, and when creeping into by force or move back brill, the breaking of rod easily occurs, loses brills, drilling gas burning and the accidents such as CO is poisoning of holing.When the anti-blocking drilling tool construction drill of deslagging in application is double-deck, as shown in Figure 7, distinguished and admirable or current with pressure arrive at the bottom of hole by the annular gap formed by outer drilling rod body 9 and inner connection tube 10 via central backflow drill bit 6, drill bit is broken the double-deck interior anti-blocking drilling rod inner-layer channel 16 of deslagging of drilling cuttings feeding that coal is formed, deslagging completes in drilling rod cavity, avoid boring contraction, hole wall unstable failure collapse hole to the impact in hole drilling deslagging space, can effectively prevent boring to block, as shown in Figure 8, stop by deslagging dynamic instability or bulk cinder, when in bilayer, the anti-blocking drilling rod inner-layer channel 16 of deslagging forms blocking, owing to having welded antipriming pipe 11 at the inwall of inner connection tube 10, aperture 17-1 along antipriming pipe 11 is entered antipriming pipe by the distinguished and admirable or current of blocking intersegmental part, and flow out at a high speed from other aperture of blocking region antipriming pipe 11, such as hole 17-2, 17-3, strong turbulent flow is defined like this in blocking region, be conducive to the dredging blocking section, the present invention is by arranging antipriming pipe 11 at the inwall of inner connection tube 10, drilling rod inner-layer channel 16 can be effectively prevented to block.
Embodiment two: as shown in Fig. 9 ~ Figure 11, different from embodiment one is, the external surface of outer drilling rod body 9 is provided with helical groove 28, in boring Huo Zuanxue district of significant shrinkage district, when drilling rod rotates, drilling rod surface drilling cuttings forms helical feed state, is conducive to drilling rod surface radiating, the drilling tool high temperature avoiding heat accumulation to be formed.The using method of embodiment two is identical with embodiment one.
Embodiment three: as shown in Figure 12 ~ Figure 14, from embodiment one, different being of embodiment two, the external surface of outer drilling rod body 9 is provided with spiral ridge 29, with example two, there is same function, spiral ridge adopts plasma cladding technique simultaneously, effectively improve the intensity of outer drilling rod body 9, improve the bulk strength of drilling rod, indirectly extend the application life of drilling rod.The using method of embodiment three and embodiment one, embodiment two are identical.
Claims (7)
1. for soft projecting coal bed creep into double-deck in the anti-blocking drilling tool of deslagging, comprise the double-deck interior anti-blocking drilling rod of deslagging, central backflow drill bit, rotatory sealing water supply installation or air supply device, it is characterized in that: described rotatory sealing water supply installation or air supply device are connected with the anti-blocking drilling rod of deslagging in the bilayer on rig, central backflow drill bit be arranged on double-deck in the front end of the anti-blocking drilling rod of deslagging, in double-deck, the anti-blocking drilling rod of deslagging is made up of outer drilling rod body, inner connection tube and the antipriming pipe that is welded on inner connection tube inwall.
2. according to claim 1 for soft projecting coal bed creep into double-deck in the anti-blocking drilling tool of deslagging, it is characterized in that: described outer drilling rod body is made up of male connection, the body of rod and female adapter, male connection, female adapter can be designed to taper screw thread or flat button, and outer drilling rod external surface is set to light face, helical groove or spiral ridge.
3. according to claim 2 for soft projecting coal bed creep into double-deck in the anti-blocking drilling tool of deslagging, it is characterized in that: described inner connection tube structure and outer drilling rod body similar, joint connects can be designed to screwed connection or socket connection, and its external diameter is less than outer drilling rod body internal diameter, ensure to be formed between inner connection tube external diameter and outer drilling rod body internal diameter the outer layer channel that air-flow or current enter, the hollow cavity of inner connection tube is the inner-layer channel of drilling system, and drill bit breaks the drilling cuttings that coal formed and relies on distinguished and admirable or current to discharge along inner-layer channel.
4. according to claim 3 for soft projecting coal bed creep into double-deck in the anti-blocking drilling tool of deslagging, it is characterized in that: described antipriming pipe is welded on the inwall of inner connection tube, and its diameter is less, and arranges aperture at spacing intervals.
5. according to claim 4 for soft projecting coal bed creep into double-deck in the anti-blocking drilling tool of deslagging, it is characterized in that: described central backflow drill bit is made up of the outer drilling rod body female adapter of drill bit, the female adapter of through hole core pipe, carcass and alloy blade, joint can be designed to taper screw thread or flat button; The outer drilling rod body female adapter of drill bit is connected with the anti-blocking drilling rod male connection of deslagging in bilayer, and the outer drilling rod body female adapter of drill bit connects with bit matrix and forms the inlet channel identical with the anti-blocking drilling rod of deslagging in bilayer; The female adapter of through hole core pipe is arranged at bit central one end inner connection tube and connects, and the other end, along being connected with bit matrix central through hole, forms central backflow passage.
6. according to claim 5 for soft projecting coal bed creep into double-deck in the anti-blocking drilling tool of deslagging, it is characterized in that: described rotatory sealing water supply installation or air supply device are made up of deslagging core union, rotation seal joint and sealing air guide room, deslagging core pipe is connected with inner connection tube, deslagging core pipe non rotating in work, axis of rotation is connected with outer drilling rod body and keeps synchronous rotary, realize rotary drilling, sealing one end, air guide room connecting downhole airduct or water pipe, realize air-flow or current enter along drilling rod outer layer channel, the drilling cuttings of Gas-solid Coupling is discharged along inner-layer channel.
7. for soft projecting coal bed creep into double-deck in the using method of the anti-blocking drilling tool of deslagging, adopt as claimed in claim 6 for soft projecting coal bed creep into double-deck in the anti-blocking drilling tool of deslagging, it is characterized in that: comprise the following steps:
1.. complete rig, drilling tool and dreg removing system thereof and install and be connected, utilize rotatory sealing water supply installation or air supply device that distinguished and admirable or current are sent into the double-deck interior anti-blocking drilling rod outer layer channel of deslagging, deslagging core pipe non rotating in work, axis of rotation is connected with outer drilling rod body and keeps synchronous rotary, realize rotary drilling, sealing one end, air guide room connection airduct or water pipe, realize air-flow or current enter along drilling rod outer layer channel;
2.. distinguished and admirable or current with pressure arrive at the bottom of hole by central backflow drill bit, drill bit is broken the double-deck interior anti-blocking drilling rod inner-layer channel of deslagging of drilling cuttings feeding that coal is formed, which is contrary with the deslagging route that routine is crept into, deslagging completes in drilling rod cavity, can effectively avoid boring contraction, hole wall unstable failure collapse hole on the impact in hole drilling deslagging space;
3.. drill bit is broken drilling cuttings that coal formed and returns out to enter along the anti-blocking drilling rod inner-layer channel of deslagging in double-deck and is connected slagging deduster with drilling rod afterbody by distinguished and admirable or current, and complete deslagging and dedusting, drilling cuttings is migrated at enclosure space, avoids gas leakage and leakage dirt passage.
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| CN201310566830.6A CN103556944B (en) | 2013-11-13 | 2013-11-13 | For soft projecting coal bed creep into double-deck in the anti-blocking drilling tool of deslagging and using method thereof |
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| CN201310566830.6A CN103556944B (en) | 2013-11-13 | 2013-11-13 | For soft projecting coal bed creep into double-deck in the anti-blocking drilling tool of deslagging and using method thereof |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| DE19917538A1 (en) * | 1999-04-19 | 2000-10-26 | Flowtex Technologie Gmbh & Co | Horizontal wet drilling tool uses vibration device for periodic impact of drill rod or drill head in longitudinal direction during horizontal displacement |
| CN101446178A (en) * | 2008-11-13 | 2009-06-03 | 煤炭科学研究总院西安研究院 | Wind pressure air drilling equipment in downhole soft outbursting coal bed and process matched therewith |
| CN102031935A (en) * | 2010-12-01 | 2011-04-27 | 中信重工机械股份有限公司 | Extendable combined drill rod with water passage, air passage and slurry returning passage |
| CN202900107U (en) * | 2012-11-20 | 2013-04-24 | 北京建研机械科技有限公司 | Drilling tool deslagging device of drilling machine |
| CN203716841U (en) * | 2013-11-13 | 2014-07-16 | 河南理工大学 | Double-layer internal slag discharging and plugging prevention drilling tool for soft outburst coal seam drilling |
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| Publication number | Publication date |
|---|---|
| CN103556944A (en) | 2014-02-05 |
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