CN104453721A - Anti-hole-collapse reverse circulation sampling drill bit - Google Patents
Anti-hole-collapse reverse circulation sampling drill bit Download PDFInfo
- Publication number
- CN104453721A CN104453721A CN201410785650.1A CN201410785650A CN104453721A CN 104453721 A CN104453721 A CN 104453721A CN 201410785650 A CN201410785650 A CN 201410785650A CN 104453721 A CN104453721 A CN 104453721A
- Authority
- CN
- China
- Prior art keywords
- hole
- cutter tip
- bit body
- drill bit
- sampling
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Pending
Links
- 238000005070 sampling Methods 0.000 title claims abstract description 47
- 238000005520 cutting process Methods 0.000 claims abstract description 17
- 238000005553 drilling Methods 0.000 claims description 10
- 238000007599 discharging Methods 0.000 claims description 4
- 238000000034 method Methods 0.000 abstract description 12
- 239000003245 coal Substances 0.000 abstract description 9
- 230000000694 effects Effects 0.000 description 9
- 239000002245 particle Substances 0.000 description 5
- 239000007921 spray Substances 0.000 description 4
- 230000009286 beneficial effect Effects 0.000 description 3
- 239000002817 coal dust Substances 0.000 description 3
- 230000000903 blocking effect Effects 0.000 description 2
- 238000005516 engineering process Methods 0.000 description 2
- 238000002347 injection Methods 0.000 description 2
- 239000007924 injection Substances 0.000 description 2
- 230000004308 accommodation Effects 0.000 description 1
- 230000000740 bleeding effect Effects 0.000 description 1
- 238000001816 cooling Methods 0.000 description 1
- 238000004880 explosion Methods 0.000 description 1
- 238000013467 fragmentation Methods 0.000 description 1
- 238000006062 fragmentation reaction Methods 0.000 description 1
- 230000002045 lasting effect Effects 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 238000005259 measurement Methods 0.000 description 1
- 238000005065 mining Methods 0.000 description 1
- 239000000843 powder Substances 0.000 description 1
- 238000005507 spraying Methods 0.000 description 1
Classifications
-
- E—FIXED CONSTRUCTIONS
- E21—EARTH OR ROCK DRILLING; MINING
- E21B—EARTH OR ROCK DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
- E21B10/00—Drill bits
- E21B10/02—Core bits
-
- E—FIXED CONSTRUCTIONS
- E21—EARTH OR ROCK DRILLING; MINING
- E21B—EARTH OR ROCK DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
- E21B10/00—Drill bits
- E21B10/42—Rotary drag type drill bits with teeth, blades or like cutting elements, e.g. fork-type bits, fish tail bits
- E21B10/43—Rotary drag type drill bits with teeth, blades or like cutting elements, e.g. fork-type bits, fish tail bits characterised by the arrangement of teeth or other cutting elements
-
- E—FIXED CONSTRUCTIONS
- E21—EARTH OR ROCK DRILLING; MINING
- E21B—EARTH OR ROCK DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
- E21B10/00—Drill bits
- E21B10/60—Drill bits characterised by conduits or nozzles for drilling fluids
- E21B10/605—Drill bits characterised by conduits or nozzles for drilling fluids the bit being a core-bit
-
- E—FIXED CONSTRUCTIONS
- E21—EARTH OR ROCK DRILLING; MINING
- E21B—EARTH OR ROCK DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
- E21B10/00—Drill bits
- E21B10/60—Drill bits characterised by conduits or nozzles for drilling fluids
- E21B10/61—Drill bits characterised by conduits or nozzles for drilling fluids characterised by the nozzle structure
Landscapes
- Engineering & Computer Science (AREA)
- Life Sciences & Earth Sciences (AREA)
- Geology (AREA)
- Mining & Mineral Resources (AREA)
- Mechanical Engineering (AREA)
- Physics & Mathematics (AREA)
- Environmental & Geological Engineering (AREA)
- Fluid Mechanics (AREA)
- General Life Sciences & Earth Sciences (AREA)
- Geochemistry & Mineralogy (AREA)
- Sampling And Sample Adjustment (AREA)
Abstract
The invention discloses an anti-collapse hole reverse circulation sampling drill bit, which comprises a drill bit body and a hollow annular ejector, wherein a cavity is formed in the drill bit body; one end of the drill bit body is respectively provided with an inner layer cutting tool bit, a middle layer cutting tool bit and an outer layer cutting tool bit from inside to outside, a sampling port is arranged at the position of the inner layer cutting tool bit, a clearance groove for deslagging is arranged between the middle layer cutting tool bit and the outer layer cutting tool bit, the annular ejector is fixedly arranged in a cavity of the drill bit body and forms an annular inner cavity with the inner wall of the drill bit body, and the sampling port is communicated with the hollow annular ejector; the drill bit body is correspondingly provided with a jet hole which is communicated with the annular inner cavity; the drill bit is simple in operation process, can quickly and accurately sample in a soft outburst coal seam, saves sampling time, improves sampling depth, coal mine sampling work efficiency and safety, and reduces the occurrence rate of gas disaster accidents.
Description
Technical field
The invention belongs to drill bit field, be specifically related to a kind of anti-collapse hole reverse circulation sampling bit.
Background technology
Current coal mine gas hazard management based on regional control, Local provisions is supplementary, the Fast Measurement technology of region Gas explosion burns becomes urgent problem, and thus deep hole sampling is the matter of utmost importance needing to solve.The sampling mode of existing deep layer gas mainly contains: basket sampling, Auger drilling aperture connect coal dust, the sampling of pressure wind injection etc., and depth selection is at about 30 meters generally at about 30 minutes its sample time in sampling process for these sampling methods.Its main cause is drill bit, sample rate is slow and depth selection is shallow to use this normal drill bit to exist, cause sample time in actual sampling work long and can not the problem of spot sampling, seriously hinder the production effect of seam mining, govern the development of productivity.
Summary of the invention
In view of this, the object of the present invention is to provide a kind of anti-collapse hole reverse circulation sampling bit saved sample time, increase depth selection, improve colliery sampling operating efficiency and safety.
For achieving the above object, the invention provides following technical scheme: a kind of anti-collapse hole reverse circulation sampling bit, comprising the bit body that inside is provided with cavity and the hollow ring ejector be arranged in bit body; Described bit body one end is respectively equipped with internal layer, middle level and outer cutter tip from the inside to the outside, described internal layer cutter tip place is provided with sample tap, the clearance groove for deslagging is provided with between described middle level and outer cutter tip, in the cavity that described annular ejector is fixedly installed on bit body and and form annular cavity between bit body inwall, described sample tap is connected with hollow ring ejector; On described bit body, correspondence is provided with spray-hole, and described spray-hole is connected with annular cavity.
Further, described annular ejector comprises interconnective first body and the second body, and described first body one end is provided with charging aperture, and the other end is provided with return air spray-hole; Described second body one end is provided with return air chamber, and the other end is provided with discharging opening, and the charging aperture of described first body communicates with described sample tap, and described return air chamber communicates with return air spray-hole.
Further, described internal layer, middle level and outer cutter tip are arranged successively from low to high, form the cutting sidewall of inner concave shape.
Further, described outer cutter tip is 4 ~ 6, and middle level cutter tip is 3 ~ 4, and internal layer cutter tip is 2 ~ 3, and each layer cutter tip is evenly arranged.
Further, the angle between the central axis of described spray-hole and bit body drilling direction is 5 ° ~ 60 °, and and between the cutting face of outer cutter tip angle be 30 ° ~ 80 °.
Beneficial effect of the present invention is:
1. anti-collapse hole reverse circulation sampling bit of the present invention is by arranging spray-hole, compressed air is utilized to make ickings be pressed into sample tap, reach and sample fast and accurately, significantly can save sample time, improve depth selection, improve colliery sampling operating efficiency and safety, reduce Gas Disaster accident;
2. anti-collapse hole reverse circulation sampling bit of the present invention is by arranging annular ejector, produces suction effect, can improve sample rate in sampling process;
3. the cutter tip that reduces successively by arranging three layer heights of anti-collapse hole reverse circulation sampling bit of the present invention, outer cutter tip is enable to have supporting role to foot of hole hole wall, prevent hole wall to subside suddenly a large amount of ickings blocking chisel edge sample tap, outer cutter tip inner ring groove provides fixing spatial accommodation for the ickings under cutting, under the acting in conjunction of middle level and internal layer cutter tip, ickings is continued destroy as uniform particle diameter, meet sampling Particle size requirements, be easy to the qualified samples drilling cuttings of Geldart-D particle, can ensure in sampling process stable, continue, the drilling cuttings supply of uniform particle diameter,
4. anti-collapse hole reverse circulation sampling bit of the present invention is by after arranging spray-hole and annular ejector, and this drill bit can reach more than 100 meters to soft projecting coal bed depth selection, and sample rate can bring up to 500g/min, reduces to about 2 minutes sample time.
Accompanying drawing explanation
In order to make object of the present invention, technical scheme and beneficial effect clearly, the invention provides following accompanying drawing and being described:
Fig. 1 is structural representation of the present invention;
Fig. 2 is the structural representation of annular ejector.
Detailed description of the invention
Below in conjunction with accompanying drawing, the preferred embodiments of the present invention are described in detail.
As shown in the figure, the anti-collapse hole reverse circulation sampling bit in the present embodiment, comprises the bit body 1 that inside is provided with cavity and the hollow ring ejector 2 be arranged in bit body 1; Described bit body 1 one end is respectively equipped with internal layer 3, middle level 4 and outer cutter tip 5 from the inside to the outside, described internal layer cutter tip 3 place is provided with sample tap 6, the clearance groove 7 for deslagging is provided with between described middle level 4 and outer cutter tip 5, in the cavity that described annular ejector 2 is fixedly installed on bit body 1 and and form annular cavity 8 between bit body 1 inwall, described sample tap 6 is connected with hollow ring ejector 2; On described bit body 1, correspondence is provided with spray-hole 9, and described spray-hole 9 is connected with annular cavity 8.
In the present embodiment, spray-hole 9 is 3 or 4, is uniformly arranged on bit body 1, and the compressed air stepless action being conducive to spraying from spray-hole 9 is in sample tap 6.Bit body 1 is supported by outer cutter tip 5 pairs of foot of hole hole walls, can prevent hole wall in sampling process from subsiding suddenly and cause a large amount of ickings to be deposited in position, bit body 1 front end thus blocking sample tap 6, for sampling process provides coal powder quantity of bore that is stable, lasting, uniform particle diameter; And then make ickings be pressed into sampling passage by the compressed air that spray-hole 9 ejects.This structure can reach fast, accurately, the object of safety sampling, sample time can be saved, improve depth selection and colliery sampling operating efficiency and safety, significantly reduce Gas Disaster accident.
Concrete, the anti-collapse hole reverse circulation sampling bit in the present embodiment and the equipment such as double-wall drill pipe and rig with the use of.When normally creeping into, rig drives drill bit to advance, the common broken coal petrography of internal layer 3, middle level 4 and outer cutter tip 5; Subdrilling bits in hole are concentrated on center, bit body 1 end by its ectomesoderm cutter tip 5, and continue fragmentation by middle level cutter tip 4 and internal layer cutter tip 3, the drilling cuttings be broken discharges bit body 1 by the clearance groove 7 between middle level 4 and outer cutter tip 5; Meanwhile, spray-hole 9 and sample tap 6 spray the cooling that compressed air carries out creeping into deslagging and cutter tip, are beneficial to carrying out smoothly of boring further.
During sampling, spray-hole 9 ejects compressed air, and now, sample tap 6 does not spray compressed air and changes the state of bleeding into, and the compressed air sprayed from spray-hole 9 enters by clearance groove 7 reacting cycle that sample tap 6 realizes air-flow; Now, be admitted in sample tap 6 under the swabbing action of the compressed-air actuated force feed effect that the ickings produced under the crushing force effect of internal layer 3, middle level 4 and outer cutter tip 5 sprays at spray-hole 9 and sample tap 6, realize the sampling process in coal seam.
Annular ejector 2 in the present embodiment is fixedly installed in the cavity of bit body 1, simultaneously, annular cavity 8 is defined between annular ejector 2 outer wall and bit body 1 inwall, the control of air-flow and solid-gas ratio in double-wall drill pipe can be realized by the combination of spray-hole 9 and annular ejector 2, realize the fast sampling in coal seam.Sample with existing basket, Auger drilling aperture connects coal dust, conventional to press compared with the sampling processes such as wind injection, this structure is simple, sampling process is quick and convenient, effectively can prevent hole ground coal body from subsiding suddenly and cause sample tap 6 to block.
Annular ejector 2 in the present embodiment comprises interconnective first body 21 and the second body 22, and described first body 21 one end is provided with charging aperture 23, and the other end is provided with return air spray-hole 24; Described second body 22 one end is provided with return air chamber 25, and the other end is provided with discharging opening 26, and the charging aperture 23 of described first body 21 communicates with described sample tap 6, and described return air chamber 25 communicates with return air spray-hole 24.
Concrete, the charging aperture 23 in the present embodiment is the flaring mouth of pipe with return air chamber 25, is conducive to annular ejector 2 and can produces better suction effect when sampling, improve sample rate; When feeding, part compressed air is sprayed by spray-hole 9 after annular cavity 8, another part enters flaring return air chamber 25 through return air spray-hole 24, under the reacting cycle effect and return air chamber 25 effect of spray-hole 9, charging aperture 23 place of annular ejector 2 produces suction effect, thus coal dust is entered in double-wall drill pipe by discharging opening 26 manage, and be delivered to aperture, realize fast sampling, the present embodiment can regulate rational solid-gas ratio by the return air spray-hole 24 of annular ejector 2, implementation process is simple, is convenient to control.
As the further improvement of such scheme, described internal layer 3, middle level 4 and outer cutter tip 5 are arranged successively from low to high, form the cutting sidewall of inner concave shape.Subdrilling bits in hole are concentrated on the groove of bit body 1 end by drilling process ectomesoderm cutter tip 5, and the continuation being conducive to middle level cutter tip 4 and internal layer cutter tip 3 pairs of drilling cuttings is broken.
As the further improvement of such scheme, described outer cutter tip 5 is 4 ~ 6, and middle level cutter tip 4 is 3 ~ 4, and internal layer cutter tip 3 is 2 ~ 3, and each layer cutter tip is evenly arranged, and concrete quantity can be arranged according to the dimensions of bit body 1.
As the further improvement of such scheme, the angle between the central axis of described spray-hole 9 and bit body 1 drilling direction is 5 ° ~ 60 °, and and between the cutting face of outer cutter tip 5 angle be 30 ° ~ 80 °.The compressed air that the spray-hole 9 arranged in this angular range sprays can reach optimum reacting cycle effect.
What finally illustrate is, above preferred embodiment is only in order to illustrate technical scheme of the present invention and unrestricted, although by above preferred embodiment to invention has been detailed description, but those skilled in the art are to be understood that, various change can be made to it in the form and details, and not depart from claims of the present invention limited range.
Claims (5)
1. an anti-collapse hole reverse circulation sampling bit, is characterized in that: comprise the bit body that inside is provided with cavity and the hollow ring ejector be arranged in bit body; Described bit body one end is respectively equipped with internal layer, middle level and outer cutter tip from the inside to the outside, described internal layer cutter tip place is provided with sample tap, the clearance groove for deslagging is provided with between described middle level and outer cutter tip, in the cavity that described annular ejector is fixedly installed on bit body and and form annular cavity between bit body inwall, described sample tap is connected with hollow ring ejector; On described bit body, correspondence is provided with spray-hole, and described spray-hole is connected with annular cavity.
2. anti-collapse hole reverse circulation sampling bit according to claim 1, is characterized in that: described annular ejector comprises interconnective first body and the second body, described first body one end is provided with charging aperture, and the other end is provided with return air spray-hole; Described second body one end is provided with return air chamber, and the other end is provided with discharging opening, and the charging aperture of described first body communicates with described sample tap, and described return air chamber communicates with return air spray-hole.
3. anti-collapse hole reverse circulation sampling bit according to claim 1, is characterized in that: described internal layer, middle level and outer cutter tip are arranged successively from low to high, forms the cutting sidewall of inner concave shape.
4. anti-collapse hole reverse circulation sampling bit according to claim 3, it is characterized in that: described outer cutter tip is 4 ~ 6, middle level cutter tip is 3 ~ 4, and internal layer cutter tip is 2 ~ 3, and each layer cutter tip is evenly arranged.
5. anti-collapse hole reverse circulation sampling bit according to claim 1, is characterized in that: the angle between the central axis of described spray-hole and bit body drilling direction is 5 ° ~ 60 °, and and between the cutting face of outer cutter tip angle be 30 ° ~ 80 °.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410785650.1A CN104453721A (en) | 2014-12-17 | 2014-12-17 | Anti-hole-collapse reverse circulation sampling drill bit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410785650.1A CN104453721A (en) | 2014-12-17 | 2014-12-17 | Anti-hole-collapse reverse circulation sampling drill bit |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN104453721A true CN104453721A (en) | 2015-03-25 |
Family
ID=52900399
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201410785650.1A Pending CN104453721A (en) | 2014-12-17 | 2014-12-17 | Anti-hole-collapse reverse circulation sampling drill bit |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN104453721A (en) |
Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108693069A (en) * | 2018-08-13 | 2018-10-23 | 中煤科工集团重庆研究院有限公司 | Drilling coal dust gas desorption characteristic parameter measurement while drilling device |
| CN109470509A (en) * | 2018-10-25 | 2019-03-15 | 四川大学 | A kind of sampler of Accurate Determining coal seam gas-bearing capacity |
| CN110566129A (en) * | 2019-10-27 | 2019-12-13 | 王琨 | Reverse circulation dust sampling drill bit |
| CN111894464A (en) * | 2020-07-17 | 2020-11-06 | 中国石油大学(北京) | PDC and single cone compounded inner chip removal drill bit |
| CN111982567A (en) * | 2020-08-17 | 2020-11-24 | 中煤科工集团重庆研究院有限公司 | Construction method of gas loss compensation model in deep hole reverse circulation sampling process |
| CN112412375A (en) * | 2020-11-20 | 2021-02-26 | 中煤科工集团重庆研究院有限公司 | Core bit is got to colliery coal sample in pit |
| CN114909095A (en) * | 2022-05-18 | 2022-08-16 | 重庆寅翔智能科技有限公司 | Deep hole rapid sampling equipment and production process thereof |
Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101566046A (en) * | 2009-06-11 | 2009-10-28 | 石家庄中煤装备制造有限公司 | Anti-collapse hole drill tool |
| CN101963043A (en) * | 2010-10-19 | 2011-02-02 | 煤炭科学研究总院重庆研究院 | Positive pressure jet spiral sampling drill |
| CN103075105A (en) * | 2013-01-31 | 2013-05-01 | 中煤科工集团重庆研究院 | Cyclone type jetting drill bit |
| CN203050511U (en) * | 2013-01-31 | 2013-07-10 | 中煤科工集团重庆研究院 | Whirlwind type jet drill bit |
| CN203081286U (en) * | 2013-01-08 | 2013-07-24 | 陈淑英 | Anti-hole-collapse drilling tool |
-
2014
- 2014-12-17 CN CN201410785650.1A patent/CN104453721A/en active Pending
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101566046A (en) * | 2009-06-11 | 2009-10-28 | 石家庄中煤装备制造有限公司 | Anti-collapse hole drill tool |
| CN101963043A (en) * | 2010-10-19 | 2011-02-02 | 煤炭科学研究总院重庆研究院 | Positive pressure jet spiral sampling drill |
| CN203081286U (en) * | 2013-01-08 | 2013-07-24 | 陈淑英 | Anti-hole-collapse drilling tool |
| CN103075105A (en) * | 2013-01-31 | 2013-05-01 | 中煤科工集团重庆研究院 | Cyclone type jetting drill bit |
| CN203050511U (en) * | 2013-01-31 | 2013-07-10 | 中煤科工集团重庆研究院 | Whirlwind type jet drill bit |
Cited By (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108693069A (en) * | 2018-08-13 | 2018-10-23 | 中煤科工集团重庆研究院有限公司 | Drilling coal dust gas desorption characteristic parameter measurement while drilling device |
| CN108693069B (en) * | 2018-08-13 | 2021-01-01 | 中煤科工集团重庆研究院有限公司 | Drilling coal dust gas desorption characteristic parameter measurement while drilling device |
| CN109470509A (en) * | 2018-10-25 | 2019-03-15 | 四川大学 | A kind of sampler of Accurate Determining coal seam gas-bearing capacity |
| CN110566129A (en) * | 2019-10-27 | 2019-12-13 | 王琨 | Reverse circulation dust sampling drill bit |
| CN111894464A (en) * | 2020-07-17 | 2020-11-06 | 中国石油大学(北京) | PDC and single cone compounded inner chip removal drill bit |
| CN111982567A (en) * | 2020-08-17 | 2020-11-24 | 中煤科工集团重庆研究院有限公司 | Construction method of gas loss compensation model in deep hole reverse circulation sampling process |
| CN111982567B (en) * | 2020-08-17 | 2024-02-02 | 中煤科工集团重庆研究院有限公司 | Method for constructing gas loss compensation model in deep hole reverse circulation sampling process |
| CN112412375A (en) * | 2020-11-20 | 2021-02-26 | 中煤科工集团重庆研究院有限公司 | Core bit is got to colliery coal sample in pit |
| CN114909095A (en) * | 2022-05-18 | 2022-08-16 | 重庆寅翔智能科技有限公司 | Deep hole rapid sampling equipment and production process thereof |
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| Date | Code | Title | Description |
|---|---|---|---|
| C06 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| RJ01 | Rejection of invention patent application after publication | ||
| RJ01 | Rejection of invention patent application after publication |
Application publication date: 20150325 |