CN111980603A - Coal seam long-drill-hole drilling water-feeding sediment coal slag discharging system and sediment discharging method - Google Patents
Coal seam long-drill-hole drilling water-feeding sediment coal slag discharging system and sediment discharging method Download PDFInfo
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- CN111980603A CN111980603A CN202010936321.8A CN202010936321A CN111980603A CN 111980603 A CN111980603 A CN 111980603A CN 202010936321 A CN202010936321 A CN 202010936321A CN 111980603 A CN111980603 A CN 111980603A
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- E—FIXED CONSTRUCTIONS
- E21—EARTH DRILLING; MINING
- E21B—EARTH DRILLING, e.g. DEEP DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
- E21B21/00—Methods or apparatus for flushing boreholes, e.g. by use of exhaust air from motor
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- C—CHEMISTRY; METALLURGY
- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
- C09K—MATERIALS FOR MISCELLANEOUS APPLICATIONS, NOT PROVIDED FOR ELSEWHERE
- C09K8/00—Compositions for drilling of boreholes or wells; Compositions for treating boreholes or wells, e.g. for completion or for remedial operations
- C09K8/52—Compositions for preventing, limiting or eliminating depositions, e.g. for cleaning
- C09K8/528—Compositions for preventing, limiting or eliminating depositions, e.g. for cleaning inorganic depositions, e.g. sulfates or carbonates
Abstract
The invention discloses a coal seam long drilling water-feeding sediment coal slag discharging system and a sediment discharging method, wherein the coal seam long drilling water-feeding sediment coal slag discharging system comprises a box body, a water pump, a drill rod, a drill bit and a rotational flow device; the inlet of the water pump is communicated with the outlet of the box body through a pipeline; one end opening of the drill rod is communicated with an outlet of the water pump through a pipeline, and the other end of the drill rod extends into the drill hole; the tail port of the drill bit is communicated with the other port of the drill rod, and the center hole at the head end of the drill bit is communicated with the inside of the drill hole; the rotational flow device is fixed at the tail end of the drill bit; the high-density aqueous solution is arranged in the box body, the high-density aqueous solution is an inorganic salt solution, and the density of the high-density aqueous solution is greater than that of the coal cinder. The invention adopts the high-density aqueous solution to increase the buoyancy of the coal cinder, thereby greatly reducing the flow resistance of the coal cinder; meanwhile, the tail part of the drill bit is provided with the rotational flow device, the rotational flow device rotates when the drill bit rotates, the flowing power of the high-density aqueous solution can be increased, the high-density aqueous solution can flow to the outlet of the drilled hole more easily, coal slag is discharged easily, and drilling of the drilled hole is facilitated.
Description
Technical Field
The invention relates to the technical field of coal mine safety engineering, in particular to a coal seam long drilling water-feeding and sediment coal slag discharging system and a sediment discharging method.
Background
In the gas treatment mode, the construction of drilling holes in coal seams to extract gas is one of the most important means at the position of more than 2000 high gas mines in China. With the development of drilling construction equipment and technology, long-distance drilling is performed in a coal seam, for example, the drilling technology of a kilometer drilling machine is widely applied, and the current mature kilometer drilling depth is over 800 m. However, the long-distance drilling track in the coal seam is not a radial line or a straight line and is influenced by the hardness of a coal rock body and the self weight of a drilling tool, the drilling track is a 'wavy' continuously fluctuating track with different slopes, and a large amount of deposited coal slag cannot be discharged from the drilling hole at the low position of a 'wave trough', so that the drilling cannot be continued.
The existing hydrodynamic slag discharge is that water pump pressure above 30MPa is applied to an orifice, and dynamic pressure water is conducted to the bottom of a hole through a tubular channel in a drill rod and passes through a channel between the wall of the hole and the surface of the drill rod to carry coal slag out of the hole. Chinese patent CN206707754U discloses a water injection and slag discharge device for coal mine drilling, which introduces a high pressure water jet theory to make a hydraulic punching pump station, a pressure control device, an automatic conversion drill bit and the like organically combined with a drilling machine, so as to realize the integration of rock drilling and coal drilling, but the energy loss in the process is very large, the dynamic pressure water is often reduced to 3MPa through the fluctuating inner wall of a drill rod when reaching the bottom of the hole, and the pressure is difficult to effectively transfer to discharge coal slag, so that the drill bit is stuck and buried, and even expensive directional drill bits are lost in the coal hole.
At present, in the aspect of water slag removal in drilling, the appearance design of drilling tools such as a drill bit, a drill rod and the like is basically changed, the slag removal efficiency is improved to a certain extent, but the problem of slag removal is not fundamentally solved, and by changing the physical property of slag removal liquid, Chinese patent CN106285524A discloses a polymer slurry slag removal system, a method and polymer slurry for downward drilling of a coal mine.
Disclosure of Invention
The invention aims to solve the technical problem of how to solve the problem of difficult drilling caused by difficult discharge of coal slag in long-distance drilled holes in a coal seam.
The invention solves the technical problems through the following technical means:
a coal seam long drilling water-drilling sediment coal cinder discharging system comprises a box body, a water pump, a drill rod, a drill bit and a rotational flow device; the inlet of the water pump is communicated with the outlet of the box body through a pipeline; one end opening of the drill rod is communicated with an outlet of the water pump through a pipeline, and the other end of the drill rod extends into the drill hole; the tail end port of the drill bit is communicated with the other port of the drill rod, and the center hole at the head end of the drill bit is communicated with the inside of the drill hole; the rotational flow device is fixed at the tail end of the drill bit, and the drill bit rotates and drives the rotational flow device to rotate;
and a high-density aqueous solution is arranged in the box body, the high-density aqueous solution is an inorganic salt solution, and the density of the high-density aqueous solution is greater than that of the coal cinder.
The invention adopts the high-density aqueous solution to increase the buoyancy of the coal slag, thereby leading the coal slag to lose the friction force contacted with the wall surface of the drill hole and greatly reducing the flow resistance of the coal slag, thereby easily driving the coal slag to flow to the outlet of the drill hole and be discharged; meanwhile, the tail part of the drill bit is provided with the rotational flow device, the rotational flow device rotates when the drill bit rotates, flowing power can be added to high-density aqueous solution in a drill hole, and the high-density aqueous solution can flow to an outlet of the drill hole more easily, so that coal cinder is discharged easily, and drilling is facilitated.
Preferably, the swirling device comprises a main shaft; the main shaft is sleeved at the tail end of the drill bit.
Preferably, the swirling device further comprises an agitating member fixed to the main shaft.
Preferably, the stirring member is an impeller.
Preferably, the stirring member is of a helical impeller structure.
Preferably, the infusion device further comprises a first infusion tube, one port of the first infusion tube is communicated with the outlet of the box body, and the other end of the first infusion tube is communicated with the inlet of the water pump.
Preferably, the drilling device further comprises a second infusion tube, one end of the second infusion tube is communicated with the outlet of the water pump, and the other end of the second infusion tube is communicated with the inlet of the drill rod.
The invention also provides a slag discharging method of the coal seam long drilling water-drilling sediment coal slag discharging system.
A slag discharging method of a coal seam long drilling water-drilling deposited slag discharging system comprises the following steps:
s1, firstly, filling the high-density aqueous solution into a box body;
s2, starting a drill bit, and drilling the drill bit into the coal seam to form a drill hole;
s3, simultaneously starting a water pump, pumping the high-density aqueous solution in the box body by the water pump, enabling the high-density aqueous solution to enter the drill rod through a pipeline, further conveying the high-density aqueous solution to the drill bit through a channel in the center of the drill rod, and finally discharging the high-density aqueous solution into the drill hole from the center hole of the drill bit;
and S4, the drill bit rotates and simultaneously drives the rotational flow device to rotate, and the power of the high-density aqueous solution is increased under the power action of the rotational flow device, so that the high-density aqueous solution drives the coal slag to flow to the outlet of the drilled hole and be discharged.
Further, the inorganic salt solution is Na2SO4A saturated aqueous solution.
Further, the density of the inorganic salt solution is more than 1.3g/cm3。
The working principle is as follows: putting Na into the box body2SO4Stirring and melting the mixture to be used as a drilling medium, increasing the specific gravity of the drilling slag discharge water to form a high-density aqueous solution to improve the buoyancy of the coal slag, reducing the frictional resistance between the coal slag and the wall of the coal bed and facilitating the discharge of the coal slag; the high-density aqueous solution reaches the bottom of a drilling hole through the inner wall of the drill rod, turbulent flow is formed between the surface of the drill rod and the wall of the drilling hole, coal cinder is influenced by lifting buoyancy and is not deposited at the bottom of a valley of an undulating drilling track, and the adhesive force with the coal bed wall is also greatly reduced; meanwhile, the swirling device is additionally arranged at the tail end of the bottom-hole drill bit, and due to the power action of the swirling device, the power of the high-density water solution is increased, the coal slag discharge is accelerated, the drilling of the drilled hole is facilitated, the probability of 'drill sticking and drill burying' is reduced, the hole forming effect and the extraction effect are greatly improved, and the drilling efficiency is effectively improved.
The invention has the advantages that:
1. the invention adopts the high-density aqueous solution to increase the buoyancy of the coal slag, thereby leading the coal slag to lose the friction force contacted with the wall surface of the drill hole and greatly reducing the flow resistance of the coal slag, thereby easily driving the coal slag to flow to the outlet of the drill hole and be discharged; meanwhile, the tail part of the drill bit is provided with the rotational flow device, the rotational flow device rotates when the drill bit rotates, flowing power can be added to high-density aqueous solution in a drill hole, and the high-density aqueous solution can flow to an outlet of the drill hole more easily, so that coal cinder is discharged easily, and drilling is facilitated.
2. The invention has the common advantages of coal slag floating and power discharge, increases the hole bottom rotational flow device and the hole bottom deslagging power compared with the traditional slurry deslagging and hydrodynamic deslagging, and adopts high-density aqueous solution to increase the floating force of the coal slag without closing the surface characteristic of the coal body porous medium unlike the slurry deslagging method, thereby being beneficial to later-stage gas desorption and extraction.
3. The construction process of the kilometer drilling machine is not changed, the material is fed into the box in advance, the cyclone device is additionally arranged at the tail of the directional drill bit of the kilometer drilling machine, the operation is simple and convenient, the slag discharging effect is improved by 70%, the effect of a kilometer drilling construction single machine is improved by 25%, and the drilling efficiency, the hole forming effect and the extraction effect are greatly improved.
Drawings
FIG. 1 is a schematic structural diagram of a system for drilling a long drilling hole in a coal seam, draining deposited coal slag;
fig. 2 is an enlarged schematic structural diagram of a according to an embodiment of the present invention.
The reference numbers illustrate:
1. a box body; 2. a water pump; 3. a drill stem; 4. a drill bit; 5. a swirling device; 51. a main shaft; 52. a stirring member; 6. a first infusion tube; 7. a second infusion tube; 101. a high density aqueous solution; 102. a coal seam; 103. drilling; 104. and (3) coal cinder.
Detailed Description
In order to make the objects, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the embodiments of the present invention, and it is obvious that the described embodiments are some embodiments of the present invention, but not all embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
Example one
As shown in fig. 1, the embodiment discloses a coal seam long drilling water inflow sediment coal cinder discharging system, which comprises a box body 1, a water pump 2, a drill rod 3, a drill bit 4, a rotational flow device 5, a first liquid conveying pipe 6 and a second liquid conveying pipe 7; as shown in fig. 1, a high density aqueous solution is shown at 101, a coal seam is shown at 102, a borehole is shown at 103, and coal cinder is shown at 104.
As shown in fig. 1, the box body 1 of the present embodiment is an existing water tank structure, and the box body 1 has no top sealing structure, the top of the box body 1 is equipped with a box cover matched with the box body, and the box cover is further provided with a charging opening and a water outlet; the high-density aqueous solution 101 is fed into the inside of the tank 1 of this embodiment through a feed port.
As shown in fig. 1, a water inlet of the water pump 2 is communicated with a water outlet of the box body 1 through a first liquid conveying pipe 6, a water inlet end of the first liquid conveying pipe 6 extends into the box body 1, the water inlet end of the first liquid conveying pipe 6 is always positioned below the water surface of the high-density aqueous solution 101, a pipe wall of a water outlet end of the first liquid conveying pipe 6 is welded and fixed with the outer wall of the water inlet of the water pump 2, and the water inlet and the water outlet end of the first liquid conveying pipe can also be fixedly connected by adopting an existing flange and matching with; the water outlet of the water pump 2 is communicated with the inlet of the drill rod 3 through a second liquid conveying pipe 7.
As shown in fig. 1, the pipe wall of the water inlet end of the second infusion pipe 7 is welded and fixed with the outer wall of the water outlet of the water pump 2, and can also be fixedly connected by adopting the existing flange plate and matching with a bolt or a screw; the pipe wall of the water outlet end of the second infusion pipe 7 is welded and fixed with the outer wall of the inlet of the drill rod 3, and the second infusion pipe can also be fixedly connected by adopting the existing flange plate and matching with a bolt or a screw.
As shown in fig. 1, the tail end port of the drill bit 4 is communicated with the outlet of the drill rod 3, and the outer wall of the tail end port of the drill bit 4 is welded and fixed with the outer wall of the outlet of the drill rod 3, and can also be integrally formed, and can also be fixedly connected by adopting the existing flange and matching with a bolt or a screw connection mode; the central bore of the head end of the drill bit 4 communicates with the interior of the bore hole 103.
As shown in fig. 1 and 2, the swirling device 5 includes a main shaft 51 and a stirring member 52, the main shaft 51 is sleeved on the outer wall of the tail end of the drill bit 4, the inner wall of the main shaft 51 may be welded and fixed with the outer wall of the tail end of the drill bit 4, or may be mounted on the outer wall of the tail end of the drill bit 4 by using the existing bolt or screw; the stirring bar 52 is welded to the main shaft 51, and may be attached to the main shaft 51 by using conventional bolts or screws.
A forming process method of a coal seam long-drilling water-drilling sediment cinder system comprises the following steps:
s1, firstly, filling the high-density aqueous solution 101 into the box body 1;
s2, starting the drill bit 4, and drilling the drill bit 4 into the coal seam 102 to form a drill hole 103;
s3, starting the water pump 2 at the same time, pumping the high-density aqueous solution 101 in the box body 1 by the water pump 2, enabling the high-density aqueous solution 101 to enter the drill rod 3 through a pipeline, further conveying the high-density aqueous solution to the drill bit 4 through a channel in the center of the drill rod 3, and finally discharging the high-density aqueous solution from the center hole of the drill bit 4 into the drill hole 103;
s4, the drill bit 4 rotates and simultaneously drives the rotational flow device 5 to rotate, and due to the power action of the rotational flow device 5, the power of the high-density aqueous solution 101 is increased, so that the high-density aqueous solution 101 drives the coal cinder 104 to flow to the outlet of the drill hole 103 and be discharged.
The inorganic salt solution of this example was Na2SO4A saturated aqueous solution.
The inorganic salt solution of this example had a density of greater than 1.3g/cm3。
The working principle is as follows: na is put into the box body 12SO4Stirring and melting the mixture to be used as a drilling medium, increasing the specific gravity of the slag water discharged from the drill hole 103 to form a high-density aqueous solution 101, improving the buoyancy of the coal cinder 104, reducing the frictional resistance between the coal cinder 104 and the wall of the coal seam 102, and facilitating the discharge of the coal cinder 104; the high-density aqueous solution 101 reaches the bottom of the bore hole 103 through the inner wall of the drill rod 3, turbulence is formed between the surface of the drill rod 3 and the wall of the bore hole 103, the coal cinder 104 is influenced by buoyancy, is not deposited at the bottom of the valley of the track of the fluctuating bore hole 103, and the adhesion force with the wall of the coal seam 102 is also greatly reduced; meanwhile, the swirling device 5 is additionally arranged at the tail end of the hole bottom drill bit 4, and due to the power action of the swirling device 5, the power of the high-density water solution 101 is increased, the discharge of the coal slag 104 is accelerated, the drilling of the drilled hole 103 is facilitated, the probability of 'drill sticking and drill burying' is reduced, the hole forming effect and the extraction effect are greatly improved, and the drilling efficiency is effectively improved.
Compared with the prior art, the invention has the following advantages: firstly, the invention adopts the high-density aqueous solution 101 to increase the buoyancy of the coal cinder 104, thereby losing the friction force contacting with the wall surface of the drill hole 103, greatly reducing the flow resistance of the coal cinder 104, and easily driving the coal cinder 104 to flow to the outlet of the drill hole 103 and be discharged; meanwhile, the cyclone device 5 is arranged at the tail part of the drill bit 4, the cyclone device 5 rotates when the drill bit 4 rotates, the flowing power of the high-density aqueous solution 101 in the drill hole 103 can be increased, the high-density aqueous solution 101 can flow to the outlet of the drill hole 103 more easily, and therefore the coal cinder 104 is discharged easily, and the drilling of the drill hole 103 is facilitated. Secondly, the invention has the common advantages of coal slag 104 rising floating and power discharge, compared with the traditional slurry slag discharge and hydrodynamic slag discharge, the invention increases the hole bottom cyclone device 5 and the hole bottom slag discharge power, and different from the method of absorbing the coal slag 104 by the slurry slag discharge, the invention adopts the high-density aqueous solution 101 to increase the rising floating force of the coal slag 104, can not seal the surface characteristic of the coal body porous medium, and is beneficial to later-stage gas desorption and extraction. Thirdly, the construction process of the kilometer drilling machine is not changed, the material is fed into the box body 1 in advance, the cyclone device 5 is additionally arranged at the tail part of the directional drill bit 4 of the kilometer drilling machine, the operation is simple and convenient, the slag discharging effect is improved by 70%, the efficiency of a construction single machine of the kilometer drilling machine 1 is improved by 25%, and the drilling efficiency, the pore-forming effect and the extraction effect are greatly improved.
Example two
The present embodiment differs from the above embodiments in that: as shown in fig. 2, the stirring member 52 of the present embodiment adopts a conventional impeller structure, and has a spiral impeller structure.
The above examples are only intended to illustrate the technical solution of the present invention, but not to limit it; although the present invention has been described in detail with reference to the foregoing embodiments, it will be understood by those of ordinary skill in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some technical features may be equivalently replaced; and such modifications or substitutions do not depart from the spirit and scope of the corresponding technical solutions of the embodiments of the present invention.
Claims (10)
1. The utility model provides a long drilling of coal seam is bored water and is arranged deposit cinder system which characterized in that: comprises a box body, a water pump, a drill rod, a drill bit and a rotational flow device; the inlet of the water pump is communicated with the outlet of the box body through a pipeline; one end opening of the drill rod is communicated with an outlet of the water pump through a pipeline, and the other end of the drill rod extends into the drill hole; the tail end port of the drill bit is communicated with the other port of the drill rod, and the center hole at the head end of the drill bit is communicated with the inside of the drill hole; the rotational flow device is fixed at the tail end of the drill bit, and the drill bit rotates and drives the rotational flow device to rotate;
and a high-density aqueous solution is arranged in the box body, the high-density aqueous solution is an inorganic salt solution, and the density of the high-density aqueous solution is greater than that of the coal cinder.
2. The system for drilling, draining and depositing coal slag through the long drill hole of the coal seam according to claim 1, is characterized in that: the swirling device comprises a main shaft; the main shaft is sleeved at the tail end of the drill bit.
3. The system for drilling, draining and depositing coal slag through the long drill hole of the coal seam according to claim 2, is characterized in that: the rotational flow device further comprises a stirring piece, and the stirring piece is fixed on the main shaft.
4. The coal seam long borehole drilling water drainage deposit cinder system of claim 3, characterized in that: the stirring piece is an impeller.
5. The system for drilling, draining and depositing coal slag through the long drill hole of the coal seam according to claim 4, is characterized in that: the stirring piece is of a spiral impeller structure.
6. The system for drilling, draining and depositing coal slag through the long drill hole of the coal seam according to claim 1, is characterized in that: the water pump is characterized by further comprising a first infusion tube, one end of the first infusion tube is communicated with the outlet of the box body, and the other end of the first infusion tube is communicated with the inlet of the water pump.
7. The system for drilling, draining and depositing coal slag through the long drill hole of the coal seam according to claim 1, is characterized in that: the drill rod is characterized by further comprising a second infusion pipe, one end of the second infusion pipe is communicated with an outlet of the water pump, and the other end of the second infusion pipe is communicated with an inlet of the drill rod.
8. The slag discharging method of the coal seam long-drill-hole drilling water discharging deposited slag system based on the claim 1 is characterized by comprising the following steps:
s1, firstly, filling the high-density aqueous solution into a box body;
s2, starting a drill bit, and drilling the drill bit into the coal seam to form a drill hole;
s3, simultaneously starting a water pump, pumping the high-density aqueous solution in the box body by the water pump, enabling the high-density aqueous solution to enter the drill rod through a pipeline, further conveying the high-density aqueous solution to the drill bit through a channel in the center of the drill rod, and finally discharging the high-density aqueous solution into the drill hole from the center hole of the drill bit;
and S4, the drill bit rotates and simultaneously drives the rotational flow device to rotate, and the power of the high-density aqueous solution is increased under the power action of the rotational flow device, so that the high-density aqueous solution drives the coal slag to flow to the outlet of the drilled hole and be discharged.
9. The slag discharging method of the coal seam long-drill-hole drilling water discharging deposited slag system according to claim 8, characterized in that: the inorganic salt solution is Na2SO4A saturated aqueous solution.
10. The slag discharging method of the coal seam long-drill-hole drilling water discharging deposited slag system according to claim 9, characterized in that: the density of the inorganic salt solution is more than 1.3g/cm3。
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010936321.8A CN111980603A (en) | 2020-09-08 | 2020-09-08 | Coal seam long-drill-hole drilling water-feeding sediment coal slag discharging system and sediment discharging method |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010936321.8A CN111980603A (en) | 2020-09-08 | 2020-09-08 | Coal seam long-drill-hole drilling water-feeding sediment coal slag discharging system and sediment discharging method |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112834696A (en) * | 2020-12-30 | 2021-05-25 | 中煤科工集团重庆研究院有限公司 | Resistance reducing agent slag carrying capacity detection method and device |
| CN113059705A (en) * | 2021-03-23 | 2021-07-02 | 上海建工一建集团有限公司 | Concrete cutting system for core area of end of structural beam column and control method |
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| US5337824A (en) * | 1993-06-28 | 1994-08-16 | Shell Oil Company | Coal slag universal fluid |
| CN103154180A (en) * | 2010-08-26 | 2013-06-12 | 技术之星流体系统公司 | Drilling fluid and method for drilling in coal-containing formations |
| CN105298391A (en) * | 2015-12-01 | 2016-02-03 | 河南焦煤能源有限公司科学技术研究所 | Drilling-punching integral construction method for gas extraction drill hole |
| CN206707754U (en) * | 2017-04-26 | 2017-12-05 | 中矿景安科技有限公司 | A kind of coal mine drilling water filling slag-draining device |
| CN109868123A (en) * | 2017-12-04 | 2019-06-11 | 中国石油化工股份有限公司 | A kind of low density water base drilling fluid and preparation method thereof |
| CN111425138A (en) * | 2020-04-03 | 2020-07-17 | 重庆大学 | Soft outburst coal seam long drilling and hole forming system and method |
| CN211173974U (en) * | 2019-10-28 | 2020-08-04 | 上海亦又新能源科技有限公司 | Gas extraction drill rod joint and drilling tool with enhanced slag discharge function |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5337824A (en) * | 1993-06-28 | 1994-08-16 | Shell Oil Company | Coal slag universal fluid |
| CN103154180A (en) * | 2010-08-26 | 2013-06-12 | 技术之星流体系统公司 | Drilling fluid and method for drilling in coal-containing formations |
| CN105298391A (en) * | 2015-12-01 | 2016-02-03 | 河南焦煤能源有限公司科学技术研究所 | Drilling-punching integral construction method for gas extraction drill hole |
| CN206707754U (en) * | 2017-04-26 | 2017-12-05 | 中矿景安科技有限公司 | A kind of coal mine drilling water filling slag-draining device |
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| CN111425138A (en) * | 2020-04-03 | 2020-07-17 | 重庆大学 | Soft outburst coal seam long drilling and hole forming system and method |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112834696A (en) * | 2020-12-30 | 2021-05-25 | 中煤科工集团重庆研究院有限公司 | Resistance reducing agent slag carrying capacity detection method and device |
| CN113059705A (en) * | 2021-03-23 | 2021-07-02 | 上海建工一建集团有限公司 | Concrete cutting system for core area of end of structural beam column and control method |
| CN113059705B (en) * | 2021-03-23 | 2023-03-03 | 上海建工一建集团有限公司 | Concrete cutting system for core area of end of structural beam column and control method |
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Application publication date: 20201124 |