CN110219611A - A kind of combination of underground coal mine horizontal drilling core bit and its application method - Google Patents
A kind of combination of underground coal mine horizontal drilling core bit and its application method Download PDFInfo
- Publication number
- CN110219611A CN110219611A CN201910514912.3A CN201910514912A CN110219611A CN 110219611 A CN110219611 A CN 110219611A CN 201910514912 A CN201910514912 A CN 201910514912A CN 110219611 A CN110219611 A CN 110219611A
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- double
- drilling
- wall
- drill pipe
- pipe
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Links
- 238000005553 drilling Methods 0.000 title claims abstract description 105
- OKTJSMMVPCPJKN-UHFFFAOYSA-N carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 title claims abstract description 20
- 239000003245 coal Substances 0.000 title claims abstract description 20
- 210000002445 Nipples Anatomy 0.000 claims abstract description 47
- 238000000034 method Methods 0.000 claims abstract description 14
- 241001074085 Scophthalmus aquosus Species 0.000 claims abstract description 7
- 238000005070 sampling Methods 0.000 claims abstract description 5
- 238000002789 length control Methods 0.000 claims description 11
- 238000006243 chemical reaction Methods 0.000 claims description 5
- 239000011435 rock Substances 0.000 claims description 5
- 238000009991 scouring Methods 0.000 abstract description 9
- 238000010276 construction Methods 0.000 abstract description 5
- 238000010586 diagram Methods 0.000 description 4
- 230000000694 effects Effects 0.000 description 4
- 239000012530 fluid Substances 0.000 description 2
- XEEYBQQBJWHFJM-UHFFFAOYSA-N iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 description 2
- 238000004080 punching Methods 0.000 description 2
- 230000037250 Clearance Effects 0.000 description 1
- 210000003128 Head Anatomy 0.000 description 1
- 230000001154 acute Effects 0.000 description 1
- 230000002457 bidirectional Effects 0.000 description 1
- 230000015572 biosynthetic process Effects 0.000 description 1
- 230000000903 blocking Effects 0.000 description 1
- 230000035512 clearance Effects 0.000 description 1
- RYGMFSIKBFXOCR-UHFFFAOYSA-N copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 description 1
- 229910052802 copper Inorganic materials 0.000 description 1
- 239000010949 copper Substances 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 238000005755 formation reaction Methods 0.000 description 1
- PCHJSUWPFVWCPO-UHFFFAOYSA-N gold Chemical compound [Au] PCHJSUWPFVWCPO-UHFFFAOYSA-N 0.000 description 1
- 229910052737 gold Inorganic materials 0.000 description 1
- 239000010931 gold Substances 0.000 description 1
- 229910052742 iron Inorganic materials 0.000 description 1
- 238000007789 sealing Methods 0.000 description 1
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 1
Classifications
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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
- E21B10/00—Drill bits
-
- 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
- E21B17/00—Drilling rods or pipes; Flexible drill strings; Kellies; Drill collars; Sucker rods; Cables; Casings; Tubings
-
- 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
- E21B17/00—Drilling rods or pipes; Flexible drill strings; Kellies; Drill collars; Sucker rods; Cables; Casings; Tubings
- E21B17/02—Couplings; joints
- E21B17/04—Couplings; joints between rod or the like and bit or between rod and rod or the like
-
- 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
- E21B17/00—Drilling rods or pipes; Flexible drill strings; Kellies; Drill collars; Sucker rods; Cables; Casings; Tubings
- E21B17/22—Rods or pipes with helical structure
-
- 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
-
- 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
- E21B25/00—Apparatus for obtaining or removing undisturbed cores, e.g. core barrels, core extractors
- E21B25/16—Apparatus for obtaining or removing undisturbed cores, e.g. core barrels, core extractors for obtaining oriented cores
Abstract
A kind of combination of underground coal mine horizontal drilling core bit and its application method, belong to coal mine boring coring technical field, it is small can to solve direct circulation channel annular gap existing for tunnel hydraulic reverse-circulation coring method, the problem of cannot carrying out complex situations in processing hole by scouring media direct circulation method, including drilling tool I and drilling tool II, when starting lower brill, tripping in drilling tool I, continuous sampling is implemented using hydraulic reverse-circulation drilling process, when hydraulic reverse-circulation carrying core column occurs unsmooth, lay down reverse circulation swivel, adjunction pipe nipple II, single wall drilling rod and tap, drilling tool I is set to be converted to drilling tool II, double-wall drill pipe is regarded into the long cylinder of coring, it uses direct circulation drilling process instead and continues coring drilling.The present invention realizes hydraulic reverse-circulation coring drilling and direct circulation coring drilling in can boring at one time, improves the integral construction efficiency of the average footage per round trip sum of coring drilling.
Description
Technical field
The invention belongs to coal mine boring coring technical fields, and in particular to a kind of underground coal mine horizontal drilling core bit group
Conjunction and its application method.
Background technique
Tunnel core drilling based on horizontal drilling, mainly have single tube (or two-tube) mention brill formula coring, wire line coring and
Three kinds of methods such as hydraulic reverse-circulation coring.Tunnel hydraulic reverse-circulation coring method and single tube (or two-tube) mention brill formula coring method from
Generally compare, either in terms of average footage per round trip still drills cost, obtains preferable using effect, therefore,
China's iron ore, copper mine in gold mine tunnel drilling project, are more promoted and applied.
During tunnel hydraulic reverse-circulation coring drilling, in order to guarantee scouring media reacting cycle effect in hole continue with
Stablize, i.e. the scouring media of double-wall drill pipe central passage can satisfy the flow velocity (>=1.5m/s) requirement for carrying core column, at present
It is mainly realized by following several means: first is that in hole outer installing hole mouth sealing device, by the ring-type of drilling rod and hole wall formation
Clearance channel (direct circulation slagging channel) directly blocks；Second is that reducing the annular gap (1-2mm) in direct circulation channel, increases and rinse
The direct circulation deslagging resistance of medium installs a reaming righting plugging device at a certain distance such as between double-wall drill pipe, outside
Diameter is 1-2mm smaller than coring bit outer diameter, or the connector outer diameter of drilling rod is designed to differ smaller with the outer diameter of coring bit, such as
The connector outer diameter 74mm of double-wall drill pipe, coring bit outer diameter 76mm, the two difference only have 2mm.
However, there are still average footage per round trip short (about 31m), coring depth are shallower for tunnel hydraulic reverse-circulation coring method
After the problem of (mostly within 80m), especially depth are more than 50m, core blockage problem is particularly acute, and affects coring drilling
Construction efficiency.Meanwhile practice have shown that, in coal mine down-hole drilling especially drilling in coal and rock drilling, using the rock that PDC drill bit is broken
Bits grain diameter is larger, and more than 10 mesh the cutting grain mass ratio of (>=2mm) accounts for 50% or so, therefore, complicated when occurring in hole
When situation, since direct circulation channel annular gap is small, it cannot be handled by scouring media direct circulation method.
Summary of the invention
The present invention is small for direct circulation channel annular gap existing for tunnel hydraulic reverse-circulation coring method, cannot pass through punching
The problem of medium direct circulation method carries out complex situations in processing hole is washed, a kind of underground coal mine horizontal drilling core bit group is provided
Conjunction and its application method.
The present invention adopts the following technical scheme:
A kind of underground coal mine horizontal drilling core bit combination, including drilling tool I and drilling tool II, wherein drilling tool I includes being used for coring
Drill bit, for core length control pipe nipple I, several backpitch slot double-wall drill pipes, several double-wall drill pipes and the reacting cycle fire hose
One end of head, drill bit is connect with one end of pipe nipple I, and the other end of pipe nipple I is connect with one end of backpitch slot double-wall drill pipe, anti-spiral shell
The other end of spin slot double-wall drill pipe and one end of double-wall drill pipe connect, the other end of double-wall drill pipe and one end of reverse circulation swivel
Connection, if drilling tool II include for coring drill bit, for core length control pipe nipple I, several backpitch slot double-wall drill pipes,
Dry double-wall drill pipe, pipe nipple II, several single wall drilling rods and tap for conversion, one end of drill bit are connect with one end of pipe nipple I,
The other end of pipe nipple I is connect with one end of backpitch slot double-wall drill pipe, the other end and double-wall drill pipe of backpitch slot double-wall drill pipe
One end connection, the other end of double-wall drill pipe connect with one end of pipe nipple II, the other end of pipe nipple II and one end of single wall drilling rod
Connection, the other end of single wall drilling rod and one end of tap connect, wherein backpitch slot double-wall drill pipe, double-wall drill pipe and single wall
The outer diameter of drilling rod is identical, and the outer diameter of drill bit is bigger than the outer diameter of backpitch slot double-wall drill pipe, double-wall drill pipe and single wall drilling rod.
One end that the pipe nipple II is connect with double-wall drill pipe is equipped with cricoid central tube, and the one end connecting with single wall drilling rod is set
Have a connector, the side of pipe nipple II is equipped with several inclined holes, and inclined hole is communicated with the internal channel of central tube, the outer czermak space of central tube with
Several axially extending bores are equipped between connector.
The backpitch slot double-wall drill pipe includes outer tube and inner tube, and the outer surface of outer tube is equipped with reverse acting spiral slot.
The outer diameter of the drill bit is 7-24mm bigger than the outer diameter of backpitch slot double-wall drill pipe, double-wall drill pipe and single wall drilling rod.
A kind of application method of underground coal mine horizontal drilling core bit combination, includes the following steps:
When starting lower brill, tripping in drilling tool I implements continuous sampling using hydraulic reverse-circulation drilling process, and hydraulic reverse-circulation carries rock
When stem occurs unsmooth, reverse circulation swivel is laid down, adjunction pipe nipple II, single wall drilling rod and tap make drilling tool I be converted to drilling tool
II, double-wall drill pipe is regarded into the long cylinder of coring, direct circulation drilling process is used instead and continues coring drilling.
It is suitable for underground coal mine horizontal drilling coring method the invention proposes one kind and supporting drilling tool combines, can be improved back
Secondary drilling depth, meet underground coal mine high working face ultra-wide working face (300m broad wall, by the way of the bidirectional construction of air entering and returning lane,
Drilling depth 150m) coring drilling depth demand, and meet double-wall drill pipe hydraulic reverse-circulation continuous sampling and reacting cycle taken
Complicated construction requirement in core, direct circulation deslagging processing hole.
Beneficial effects of the present invention are as follows:
1. the backpitch slot structure of backpitch slot double-wall drill pipe, to the scouring media-landwaste fluid-mixing for entering direct circulation channel
It can play the role of increasing resistance, in practice process, according to the actual situation, by controlling the adjunction quantity of backpitch slot double-wall drill pipe,
Direct circulation channel resistance is set to be greater than reacting cycle channel resistance, so that the flow velocity (>=1.5m/s) for meeting reacting cycle carrying core is wanted
It asks；
2. drill bit differs larger than the specification of backpitch slot double-wall drill pipe, double-wall drill pipe, i.e. drill bit drilling is formed by hole
Annular gap between wall, with backpitch slot double-wall drill pipe, double-wall drill pipe is big (7-24mm), can meet underground coal mine PDC drill bit
The annular space size requirement that G takes landwaste partial size to pass through, therefore, if occur complex situations in hole, can be used normal circulation technology
It is handled in time, guarantees drilling tool safety in hole；
3. when hydraulic reverse-circulation carrying core column occurs unsmooth, pipe nipple is converted in adjunction, single wall bores when drilling reaches certain depth
Lower part double-wall drill pipe is regarded the long cylinder of coring by bar, tap, is used direct circulation drilling process instead and is continued coring drilling, can have
Effect improves footage per round trip, improves the integral construction efficiency of coring drilling.
Detailed description of the invention
Fig. 1 is the structural schematic diagram of drilling tool I of the present invention；
Fig. 2 is the structural schematic diagram of drilling tool II of the present invention；
Fig. 3 is the structural schematic diagram of pipe nipple II of the present invention；
Fig. 4 is the structural schematic diagram of backpitch slot double-wall drill pipe of the present invention；
Wherein: 1- drill bit；2- pipe nipple I；3- backpitch slot double-wall drill pipe；4- double-wall drill pipe；5- reverse circulation swivel；6- pipe nipple
Ⅱ；7- single wall drilling rod；8- tap；9- central tube；10- inclined hole；11- axially extending bore；12- outer tube；13- inner tube.
Specific embodiment
In conjunction with attached drawing, the present invention will be further described.
The embodiment of the invention provides a kind of underground coal mine horizontal drilling coring method and drill assembly, including drilling tool I with
Two sets of drill assembly of drilling tool II, when starting lower brill, drilling tool I described in tripping in is implemented using hydraulic reverse-circulation drilling process
Continuous sampling bores after reaching certain depth without mentioning, and lays down reverse circulation swivel 5, and pipe nipple II 6, single wall drilling rod are converted in adjunction
7, the drilling tool I is converted to the drilling tool II by tap 8, implements coring using direct circulation drilling process.
Wherein, drilling tool I includes pipe nipple I 2, the anti-spiral shell of φ 89mm of the drill bit 1 of φ 98mm coring, the control of φ 89mm core length
Spin slot double-wall drill pipe 3, φ 89mm double-wall drill pipe 4, reverse circulation swivel 5, the drill bit 1 of the φ 89mm coring connect the φ
The pipe nipple I 2 of the pipe nipple I 2 of 89mm core length control, the φ 89mm core length control connects the φ 89mm backpitch slot
Double-wall drill pipe 3, the φ 89mm backpitch slot double-wall drill pipe 3 connect the φ 89mm double-wall drill pipe 4, and the φ 89mm double-walled bores
Bar 4 connects the reverse circulation swivel 5, and the φ 89mm backpitch slot double-wall drill pipe 3 can be made into the length of 1-3m, hinders according to increasing
Actual needs is successively threadedly coupled by several, and the φ 89mm double-wall drill pipe 4 can be made into the length of 1-3m, according to drilling
The needs that depth constantly extends successively adjunction φ 89mm double-wall drill pipe 4.
Drill bit 1, pipe nipple I 2, the φ 89mm of φ 89mm core length control of the drilling tool II including φ 98mm coring are anti-
Pipe nipple II 6, the φ 89mm single wall drilling rod 7, tap 8 that helicla flute double-wall drill pipe 3, φ 89mm double-wall drill pipe 4, φ 89mm are converted,
The drill bit 1 of the φ 89mm coring connects the pipe nipple I 2 of the φ 89mm core length control, the φ 89mm core length control
The pipe nipple I 2 of system connects the φ 89mm backpitch slot double-wall drill pipe 3, and the φ 89mm backpitch slot double-wall drill pipe connects described in 3
φ 89mm double-wall drill pipe 4, the φ 89mm double-wall drill pipe 4 connect the pipe nipple II 6 of the φ 89mm conversion, the φ 89mm conversion
Pipe nipple II 6 connect the φ 89mm single wall drilling rod 7, the φ 89mm single wall drilling rod 7 connects the tap 8.
II 6 lower end of pipe nipple of the φ 89mm conversion is equipped with central tube 9, and side is equipped with one or more inclined holes 10, middle part
It is circumferentially with one or more axially extending bores 11, the central tube 9 and the 4 inner tube socket connection of double-wall drill pipe, it is described oblique
Hole 10 is communicated with 9 central passage of central tube, and the axially extending bore 11 is communicated with the outer annular space of the central tube 9.
The specification of the drill bit 1 of the φ 98mm coring is than the φ 89mm backpitch slot double-wall drill pipe 3 and the φ
The big 9mm of the specification of 89mm double-wall drill pipe 4, the φ 89mm backpitch slot double-wall drill pipe 3, the φ 89mm double-wall drill pipe 4,
The specification of the φ 89mm single wall drilling rod 7 is all identical.
Wherein, the φ 89mm backpitch slot double-wall drill pipe 3, is set with, the outer tube 12 by outer tube 12 and inner tube 13
Equipped with reverse acting spiral slot, in drilling location of the coring procedure, takes blocking effect to the landwaste that circulatory mediator carries is rinsed, increase the punching
Wash the resistance for the annular gap that circulatory mediator-landwaste fluid-mixing is formed by borehole wall and the backpitch slot double-wall drill pipe 3
Power.
The scouring media circular order of the hydraulic reverse-circulation drilling process are as follows: 5 side water filling port of reverse circulation swivel →
5 annular spaces of reverse circulation swivel → 4 annular spaces of double-wall drill pipe → 3 annular spaces of backpitch slot double-wall drill pipe → core length control pipe nipple I 2
Annular space → 1 mouth of a river of drill bit → 1 central passage of drill bit → core length control I 2 central passages of pipe nipple → backpitch slot double-walled bores
Outside 3 central passages of bar → 4 central passages of double-wall drill pipe → 5 central passages of reverse circulation swivel → hole, the drill bit 1 is broken in bottom hole
Broken landwaste and the core drilled through are mixed in company with scouring media, and it is logical to sequentially enter the double wall drill tool center that drill bit is connected with top
Road, which returns, to portal outside.
The scouring media circular order of the direct circulation circulation drilling process are as follows: 8 central passages of tap → single wall drilling rod 7
Outer 4 annular space of annular space → double-wall drill pipe of central tube 9 of 11 → pipe nipple of axially extending bore, II 6 lower end of central passage → pipe nipple II 6 → anti-
Annular space → rock that 3 annular spaces of helicla flute double-wall drill pipe → 2 annular spaces of pipe nipple → 1 mouth of a river of coring bit → coring bit 1 and hole wall are formed
Core length controls annular space → double-wall drill pipe that annular space → backpitch slot double-wall drill pipe 3 that pipe nipple I 2 and hole wall are formed and hole wall are formed
Outside annular space → hole that the annular space → single wall drilling rod 7 and hole wall that the 4 annular space → pipe nipples II 6 formed with hole wall and hole wall are formed are formed,
The landwaste companion scouring media that the drill bit 1 is crushed in bottom hole, the annular space that access aperture subdrilling tool is formed with hole wall return outer, the brill that portals
The core taken enters the double wall drill tool central passage that drill bit is connected with top, with the entrance of core, double wall drill tool central passage
Interior fluid is extruded into the annular space that single wall drilling rod 7 and hole wall are formed through inclined hole 10, and outer, the core that portals is returned with fluid in the annular space
It is taken out after trip-out.
Claims (5)
1. a kind of underground coal mine horizontal drilling core bit combination, it is characterised in that: including drilling tool I and drilling tool II, wherein drilling tool
I include for coring drill bit (1), for core length control pipe nipple I (2), several backpitch slot double-wall drill pipes (3) if,
Dry double-wall drill pipe (4) and reverse circulation swivel (5), one end of drill bit (1) are connect with one end of pipe nipple I (2), pipe nipple I (2) it is another
One end is connect with one end of backpitch slot double-wall drill pipe (3), the other end of backpitch slot double-wall drill pipe (3) and double-wall drill pipe (4)
One end connection, the other end of double-wall drill pipe (4) connect with one end of reverse circulation swivel (5), and drilling tool II is including for coring
Drill bit (1), for core length control pipe nipple I (2), several backpitch slot double-wall drill pipes (3), several double-wall drill pipes (4),
For the pipe nipple II (6), several single wall drilling rods (7) and tap (8) of conversion, one end of drill bit (1) and one end of pipe nipple I (2)
Connection, the other end of pipe nipple I (2) connect with one end of backpitch slot double-wall drill pipe (3), backpitch slot double-wall drill pipe (3) it is another
One end is connect with the one end of double-wall drill pipe (4), and the other end of double-wall drill pipe (4) is connect with one end of pipe nipple II (6), pipe nipple II
(6) the other end is connect with the one end of single wall drilling rod (7), and the other end of single wall drilling rod (7) is connect with one end of tap (8),
Wherein, backpitch slot double-wall drill pipe (3), double-wall drill pipe (4) are identical with the outer diameter of single wall drilling rod (7), and the outer diameter of drill bit (1) is than anti-
The outer diameter of helicla flute double-wall drill pipe (3), double-wall drill pipe (4) and single wall drilling rod (5) is big.
2. a kind of underground coal mine horizontal drilling core bit combination according to claim 1, it is characterised in that: the pipe nipple
One end that II (6) are connect with double-wall drill pipe (4) is equipped with cricoid central tube (9), and the one end connecting with single wall drilling rod (7), which is equipped with, to be connected
The side of interface, pipe nipple II (6) is equipped with several inclined holes (10), and inclined hole (10) is communicated with the internal channel of central tube (9), central tube
(9) several axially extending bores (11) are equipped between outer czermak space and connector.
3. a kind of combination of underground coal mine horizontal drilling core bit, it is characterised in that: the backpitch slot double-wall drill pipe (3) includes
The outer surface of outer tube (12) and inner tube (13), outer tube (12) is equipped with reverse acting spiral slot.
4. a kind of underground coal mine horizontal drilling core bit combination, it is characterised in that: the outer diameter of the drill bit (1) is than backpitch slot
The big 7-24mm of outer diameter of double-wall drill pipe (3), double-wall drill pipe (4) and single wall drilling rod (7).
5. a kind of application method of the underground coal mine horizontal drilling core bit combination as described in claim 1-4 any one,
It is characterized by comprising following steps:
When starting lower brill, tripping in drilling tool I implements continuous sampling using hydraulic reverse-circulation drilling process, and hydraulic reverse-circulation carries rock
When stem occurs unsmooth, lay down reverse circulation swivel (5), adjunction pipe nipple II (6), single wall drilling rod (7) and tap (8) make to bore
Tool I is converted to drilling tool II, and double-wall drill pipe (4) are regarded the long cylinder of coring, uses direct circulation drilling process instead and continues coring drilling.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910514912.3A CN110219611B (en) | 2019-06-14 | 2019-06-14 | Coal mine underground horizontal drilling core drill tool combination and use method thereof |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910514912.3A CN110219611B (en) | 2019-06-14 | 2019-06-14 | Coal mine underground horizontal drilling core drill tool combination and use method thereof |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN110219611A true CN110219611A (en) | 2019-09-10 |
| CN110219611B CN110219611B (en) | 2021-02-05 |
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| CN201910514912.3A Active CN110219611B (en) | 2019-06-14 | 2019-06-14 | Coal mine underground horizontal drilling core drill tool combination and use method thereof |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110821475A (en) * | 2019-11-28 | 2020-02-21 | 中煤科工集团西安研究院有限公司 | Coal mine working face bottom plate drilling resistivity monitoring method and cable pushing device |
| CN112324334A (en) * | 2020-10-30 | 2021-02-05 | 中国地质大学（武汉） | Sealed pressure-feed type horizontal directional drilling engineering geological exploration continuous coring device |
| CN112377131A (en) * | 2020-10-29 | 2021-02-19 | 中煤科工集团西安研究院有限公司 | Nearly-horizontal directional continuous coring device and method |
| CN113187409A (en) * | 2021-04-21 | 2021-07-30 | 中煤科工集团西安研究院有限公司 | Openable drill bit for double-wall drilling tool and construction method |
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