CN112112575A - Garrulous soft coal seam airtight coring bit suitable for ground drilling - Google Patents
Garrulous soft coal seam airtight coring bit suitable for ground drilling Download PDFInfo
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- CN112112575A CN112112575A CN202010980185.2A CN202010980185A CN112112575A CN 112112575 A CN112112575 A CN 112112575A CN 202010980185 A CN202010980185 A CN 202010980185A CN 112112575 A CN112112575 A CN 112112575A
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- 239000003245 coal Substances 0.000 title claims abstract description 92
- 238000005553 drilling Methods 0.000 title claims abstract description 61
- 206010024796 Logorrhoea Diseases 0.000 title claims description 7
- 238000005520 cutting process Methods 0.000 claims abstract description 32
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 23
- 238000007789 sealing Methods 0.000 claims abstract description 8
- 230000036346 tooth eruption Effects 0.000 claims description 11
- 238000000926 separation method Methods 0.000 claims description 5
- 239000012530 fluid Substances 0.000 abstract description 16
- 238000000034 method Methods 0.000 abstract description 5
- 230000008569 process Effects 0.000 abstract description 4
- 230000000694 effects Effects 0.000 abstract description 3
- 238000005070 sampling Methods 0.000 abstract description 3
- 238000005406 washing Methods 0.000 abstract description 3
- 230000009286 beneficial effect Effects 0.000 abstract description 2
- 238000005259 measurement Methods 0.000 abstract 1
- 238000010586 diagram Methods 0.000 description 3
- 238000009991 scouring Methods 0.000 description 3
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 description 2
- 239000003818 cinder Substances 0.000 description 2
- 229910052802 copper Inorganic materials 0.000 description 2
- 239000010949 copper Substances 0.000 description 2
- 239000000463 material Substances 0.000 description 2
- 230000009471 action Effects 0.000 description 1
- 239000000956 alloy Substances 0.000 description 1
- 229910045601 alloy Inorganic materials 0.000 description 1
- 230000004075 alteration Effects 0.000 description 1
- 238000003556 assay Methods 0.000 description 1
- 230000006835 compression Effects 0.000 description 1
- 238000007906 compression Methods 0.000 description 1
- 230000018109 developmental process Effects 0.000 description 1
- 229910003460 diamond Inorganic materials 0.000 description 1
- 239000010432 diamond Substances 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 230000003628 erosive effect Effects 0.000 description 1
- 238000011010 flushing procedure Methods 0.000 description 1
- 238000009434 installation Methods 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000005457 optimization Methods 0.000 description 1
- 239000013049 sediment Substances 0.000 description 1
- 239000002893 slag Substances 0.000 description 1
- 125000006850 spacer group Chemical group 0.000 description 1
- 238000005507 spraying Methods 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
- 238000003466 welding Methods 0.000 description 1
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- 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
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- 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
-
- 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
- E21B12/00—Accessories for drilling tools
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N1/00—Sampling; Preparing specimens for investigation
- G01N1/02—Devices for withdrawing samples
- G01N1/04—Devices for withdrawing samples in the solid state, e.g. by cutting
- G01N1/08—Devices for withdrawing samples in the solid state, e.g. by cutting involving an extracting tool, e.g. core bit
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- Life Sciences & Earth Sciences (AREA)
- Mining & Mineral Resources (AREA)
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- Geochemistry & Mineralogy (AREA)
- General Life Sciences & Earth Sciences (AREA)
- Fluid Mechanics (AREA)
- Environmental & Geological Engineering (AREA)
- Mechanical Engineering (AREA)
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- Earth Drilling (AREA)
Abstract
The invention discloses a broken soft coal seam closed coring bit suitable for ground drilling, which comprises an outer bit, an inner bit and a bit body, wherein the bit body is provided with three stepped holes with the diameters sequentially increasing from front to back, the outer bit is fixedly arranged on the outer ring wall at the front end of the bit body, the outer bit is provided with a plurality of cutting wings, a diversion trench is formed between every two adjacent cutting wings, the inner bit is detachably arranged on a small-diameter hole section of the three stepped holes, a water hole communicated with the diversion trench is formed in the first-stage step surface between a large-diameter hole section and a large-diameter hole section of the three stepped holes, an annular groove is formed in the large-diameter hole section of the three stepped holes, and the annular groove is used for installing a sealing ring. The enclosed coring bit for the broken soft coal seam avoids the washing of drilling fluid to the broken coal core, reduces the denudation effect of the bit wall to the coal core in the drilling process, and the inner bit enters the coal seam before the outer bit, thereby being beneficial to improving the enclosed coring sampling rate of the coal seam and the success rate of the enclosed coring coal seam gas content measurement of the ground drilling broken soft coal seam.
Description
Technical Field
The invention relates to the technical field of accurate determination of the content of ground drilling airtight coring gas, in particular to a broken soft coal seam airtight coring bit suitable for ground drilling.
Background
The broken soft coal bed has broken coal body structure, the loss speed of coal bed gas (gas) is high, the content of the coal bed gas (gas) measured by adopting a conventional coring mode is less than the actual content of the coal bed gas, the inaccurate estimation of the amount of the coal bed gas resource and the insufficient recognition of the danger degree of the coal bed gas are easily caused, and hidden troubles are left for the exploration and development of the coal bed gas (gas) resource and the safety production of a coal mine. The airtight coring technology of ground well drilling coal seam can drill the coal core at a fixed point, fast to can guarantee that the coal core promotes in the drilling, the whole airtight of ground survey, avoid the coal core to expose and cause coal bed gas (gas) loss, can realize the accurate survey of coal bed gas (gas) content.
The closed coring device generally adopts a multilayer structure, the whole diameter of the coring device is large, and the aperture of the coring inner cylinder is small. The conventional coring bit is adopted for coring, so that the drilling efficiency is low, the coal core sampling rate is low, and the broken soft coal layer can not take a coal core sample. The conventional coring bit can not take broken soft coal seam coal core samples mainly because: firstly, the coal seam in front of the drill bit is eroded by the drilling fluid, so that the coal is flushed and lost; secondly, the coal core is lost due to the denudation of the wide and thick outer wall of the core bit in the core drilling process; thirdly, the coal core is lost due to the scouring action of high-pressure water flowing between the inner wall of the coring bit and the coring inner cylinder. Therefore, in view of the current situation of the broken soft coal seam and the closed core taking, it is urgently needed to design and try out a drill bit for the closed core taking of the ground drilling broken soft coal seam so as to solve the problems that the closed core taking rate of the broken soft coal seam is low and the coal core cannot be taken.
Disclosure of Invention
The invention aims to provide a broken soft coal seam airtight coring bit suitable for ground drilling, which improves the coal core sampling rate of ground drilling coal seam airtight coring by changing the structure of the coring bit.
In order to achieve the purpose, the invention provides a broken soft coal seam closed core-taking drill bit suitable for ground drilling, which comprises an outer drill bit, an inner drill bit and a drill bit body with a tubular structure, wherein the central hole of the drill bit body is a three-step hole with the aperture gradually increasing from front to back, the outer drill bit is fixedly arranged on the outer annular wall at the front end of the drill bit body, a plurality of cutting wings are arranged at intervals in the circumferential direction of the outer annular wall of the outer drill bit, a flow guide groove is formed between any two adjacent cutting wings, each cutting wing is embedded with an outer cutting tooth and a diameter-keeping tooth, the rear end of the inner drill bit is detachably connected with a small-diameter hole section of the three-step hole, the front end surface of the inner drill bit axially protrudes out of the front end surface of the outer drill bit, a plurality of inner cutting teeth are arranged on the front end surface of the inner drill bit, and a water hole communicated with the flow guide groove is arranged on the first-, the annular groove is formed in the circumferential direction of the larger-diameter hole section of the three stepped holes, and the annular groove is used for installing sealing rings for separating the large-diameter hole section from the smaller-diameter hole section.
Based on the above, the preceding terminal surface of interior drill bit is protruding in the preceding terminal surface of outer drill bit, can make interior drill bit get into the coal seam earlier than outer drill bit, force the coal body to get into interior drill bit, the lower extreme card of coring inner tube forms tertiary step face with less footpath hole section on the path hole section, and through installing the sealing washer shutoff in the annular, or reduce the drilling fluid that gets into interior drill bit through coring inner tube lower extreme and drill bit body inner wall clearance, set up the water hole at the one-level step face between the major diameter hole section of three-step hole and the great footpath hole section, can lead to the guiding gutter with the drilling fluid passing through the water hole between coring inner tube and the drill bit body inner wall, so both can cool off outer drill bit and wash the row sediment, can avoid being excessively eroded and lead to the coal core to wash and lose.
The enclosed core-taking drill bit for the broken soft coal seam avoids the scouring of the drilling fluid passing through a water hole to the broken coal core and the scouring of the drilling fluid in the gap of the drill bit body to the coal core entering the cavity of the inner drill bit, reduces the denudation effect of the drill bit wall to the coal core in the drilling process, and is beneficial to improving the enclosed core-taking rate of the coal seam and the success rate of the enclosed core-taking coal seam gas content determination of the ground drilling broken soft coal seam.
In order to better achieve the above scheme, preferably, the rear end of the inner drill bit is connected with the front end of the drill bit body through threads.
Preferably, the central axis of the water hole is deviated from the central axis of the drill body by 8-12 degrees.
Preferably, the length between the cutting face of the outer cutting tooth and the cutting face of the inner cutting tooth is not less than 50 mm.
Preferably, the drilling bit further comprises a pressure spring and an end cap, wherein the outer ring wall of the end cap is provided with an external thread, and the inner ring wall of the end cap is a circular hole wall matched with the outer ring wall at the rear end of the inner drilling bit;
the inner wall of the rear end of the small-diameter hole section of the three stepped holes radially extends inwards to form a first retaining ring, the inner wall of the front end of the small-diameter hole section of the three stepped holes is provided with internal threads, a pressure spring is arranged in the small-diameter hole section of the three stepped holes, the rear end of the pressure spring abuts against the front end face of the first retaining ring, a second retaining ring is arranged in the circumferential direction of the outer ring wall of the rear end of the inner drill bit and abuts against the front end of the pressure spring, and the second retaining ring is locked in the small-diameter hole section of the three stepped holes through an end cap arranged on the inner wall of the front end of the small-diameter hole.
Preferably, a separation net is arranged in the water hole.
Preferably, the separation net comprises a net ring and a net piece which is arranged in the net ring and can swing along the axial direction of the net ring, and a net piece returning device is further arranged in the water hole and used for controlling the net piece to stretch.
Preferably, net piece return means includes rack and extensible member, the rack sets firmly in the rear side of net ring, the stiff end of extensible member is connected with the center of rack, net piece return means is used for controlling net piece axial swing.
Additional aspects and advantages of the invention will be set forth in part in the description which follows and, in part, will be obvious from the description, or may be learned by practice of the invention.
Drawings
In order to more clearly illustrate the detailed description of the invention or the technical solutions in the prior art, the drawings that are needed in the detailed description of the invention or the prior art will be briefly described below.
FIG. 1 is a schematic structural diagram of a closed core bit for a crushed soft coal seam suitable for ground drilling according to an embodiment of the invention;
FIG. 2 is a top view of FIG. 1;
FIG. 3 is a sectional view taken along line A-A of FIG. 2;
FIG. 4 is a schematic structural diagram of a closed core bit for a crushed soft coal seam suitable for surface drilling according to a second embodiment of the invention;
FIG. 5 is a schematic structural diagram of a closed core bit for a crushed soft coal seam suitable for surface drilling according to a third embodiment of the invention;
FIG. 6 is a schematic structural view of the spacer screen and the mesh returning device in FIG. 5;
in the reference symbols:
the drill bit comprises a drill bit body 1, a water hole 11, a large-diameter hole section 121, a large-diameter hole section 122, a small-diameter hole section 123, a small-diameter hole section 124, a ring groove 125, a primary step surface 126 and a first baffle ring 127;
the outer drill bit 2, the cutting wings 21, the guide grooves 22, the outer cutting teeth 23 and the gauge teeth 24;
the inner drill bit 3, the inner cutting teeth 31 and the second retaining ring 32;
a pressure spring 4;
an end cap 5;
Detailed Description
Reference will now be made in detail to embodiments of the present invention, examples of which are illustrated in the accompanying drawings, wherein like or similar reference numerals refer to the same or similar elements or elements having the same or similar function throughout. The embodiments described below with reference to the drawings are illustrative and intended to be illustrative of the invention and are not to be construed as limiting the invention.
Example one
Referring to fig. 1 to 3, the present embodiment discloses a soft coal seam sealing core bit suitable for ground drilling, which includes a bit body 1, an outer bit 2 and an inner bit 3.
Wherein, the drill bit body 1 is a tubular structure, the front end thereof is a hollow round platform structure, the central hole of the drill bit body 1 is a three-step hole with the aperture gradually increased from front to back, the outer drill bit 2 is fixedly arranged on the outer ring wall of the front end of the drill bit body 1, a plurality of cutting wings 21 are arranged at intervals in the circumferential direction of the outer ring wall of the outer drill bit 2, a diversion trench 22 is formed between any two adjacent cutting wings 21, each cutting wing 21 is embedded with an outer cutting tooth 23 and a diameter-keeping tooth 24, the back end of the inner drill bit 3 is detachably connected with a small-diameter hole section 124 of the three-step hole, the front end surface of the inner drill bit 3 is protruded on the front end surface of the outer drill bit 2 along the axial direction of the drill bit body 1, the front end surface of the inner drill bit 3 is provided with a plurality of inner cutting teeth 31, a water hole 11 communicated with the diversion trench 22 is arranged on a first-level step surface 126 between a large-diameter hole section 121 and a large-diameter hole section, the ring groove 125 is used for installing a sealing ring for separating the large-diameter hole section 121 and the small-diameter hole section 123.
Based on above-mentioned scheme, the coal seam is got the core well and is crept into and stop boring after the core degree of depth is got to the design, propose all drilling tools in the well, dismantle down the centreless bit, link into an organic whole interior bit 3 and bit body 1, and install in airtight coring device front end together, the airtight coring device other end is connected with coring drilling rod foremost, wherein, after the installation, the corresponding position of annular groove 125 on airtight coring device is the middle part of coring inner tube front end supporting copper sheathing, the front end of supporting copper sheathing supports and leans on the tertiary step face between the path hole section 124 and the less path hole section 123 of three-step hole.
And conveying the broken soft coal seam airtight coring bit and the airtight coring device to the bottom of a drilling well by adopting a mode of sequentially continuing coring drill rods, and starting to drill a coal core after flushing the drilling hole. When drilling the coal core, the drilling fluid loops through inside the coring drilling rod, inside the coring device, then flows out through 11 high-speed of bores, and the drilling fluid that flows out from 11 bores can cool off outer drill bit 2 to take away by the broken coal cinder on the outer rampart of outer drill bit 2, make outer drill bit 2 continuous high-efficient drilling.
In this embodiment, the outer drill 2 has a circular truncated cone inner wall which is matched with the circular truncated cone outer wall of the drill body 1, and the outer drill 2 and the drill body 1 are welded into a whole through matching of the circular truncated cone outer wall and the circular truncated cone inner wall.
In this embodiment, the rear end of the inner drill bit 3 is connected with the front end of the drill bit body 1 through threads, so that the inner drill bit 3 is convenient to disassemble and replace.
In the embodiment, four cutting wings 21 are uniformly distributed on the outer circumferential wall of the outer drill bit 2, each cutting wing 21 is uniformly distributed with a group of outer cutting teeth 23 and a group of diameter-protecting teeth 24, two water holes 11 are arranged between every two adjacent outer cutting teeth 23, the central axis of each water hole 11 is deviated from the central axis of the drill bit body 1 by 8-12 degrees, preferably, the central axis of each water hole 11 is deviated from the central axis of the drill bit body 1 by 10 degrees, so that the drilling fluid can cool the outer drill bit 2 and wash and remove slag, and the drilling fluid can be prevented from excessively eroding coal in front of the outer drill bit 2 to cause coal loss.
In the embodiment, the material of the outer cutting teeth 23 is preferably a diamond compact, the outer cutting teeth 23 are embedded on the cutting wings 21 in a welding mode, the material of the inner cutting teeth 31 and the gauge teeth 24 is preferably a hard alloy, the inner cutting teeth 31 are used for screwing in the cutting coal body, and the gauge teeth 24 can effectively protect the gauge of the outer drill bit 2 from reducing, so that the outer drill bit 2 can be screwed in smoothly.
In the embodiment, the length between the cutting surface of the outer cutting tooth 23 and the cutting surface of the inner cutting tooth 31 is not less than 50mm, and in the coring process, the inner drill bits 3 with different lengths can be selected according to the influence factors such as geological conditions, coal body crushing degree and well conditions of the coal bed, that is, one outer drill bit 2 can be connected with a plurality of inner drill bits 3 with different calibers and different lengths, so that the application range of the closed core drill bit for the broken soft coal bed can be expanded, and the coal core with minimum coal bed gas loss can be obtained.
The airtight core bit of getting in garrulous soft coal seam suitable for ground drilling that this embodiment provides is through the structure that changes water hole 11, the drilling fluid of having avoided through water hole 11 is to the washing away of broken coal core and the washing away of 3 cavity coal cores of drill bit body in getting into with the drilling fluid in 1 clearance of drill bit, the effect of denudating of drilling in-process drill bit wall to the coal core has been reduced, interior drill bit 3 gets into the coal body in advance in outer drill bit 2, help improving the airtight core rate of taking of coal seam and the airtight success rate of getting in garrulous soft coal seam of ground drilling and getting in the core coal bed gas assay, in addition, interior drill bit 3 is connected with 1 spiral shell join in marriage of drill bit body, can realize drill bit body 1 and.
Example two
As shown in fig. 4, the enclosed core bit for a crushed soft coal seam suitable for ground drilling further includes a pressure spring 4 and an end cap 5, an outer annular wall of the end cap 5 has an external thread, and an inner wall of the end cap 5 is a circular hole wall matched with the outer annular wall of the rear end of the inner bit 3.
The inner wall of the rear end of the small-diameter hole section 124 of the three stepped holes radially extends inwards to form a first retaining ring 127, the inner wall of the front end of the small-diameter hole section 124 of the three stepped holes is provided with internal threads, a pressure spring 4 is arranged in the small-diameter hole section 124 of the three stepped holes, the rear end of the pressure spring 4 is abutted against the front end face of the first retaining ring 127, a second retaining ring 32 is arranged in the circumferential direction of the outer ring wall of the rear end of the inner drill bit 3, the second retaining ring 32 abuts against the front end of the pressure spring 4, and the inner wall of the front end of the small-diameter hole section 124 of the three stepped holes is locked in the small-diameter hole section 124 of the three stepped.
The airtight coring bit in garrulous soft coal seam that this embodiment provided is when taking the coal core, when meetting the coal gangue, interior drill bit 3 receives strong resistance, forces the compression of pressure spring 4 atress, makes interior drill bit 3 can high-speed elastic cutting, helps protecting interior drill bit 3, prolongs the life of interior drill bit 3.
EXAMPLE III
As shown in fig. 5 and fig. 6, the enclosed core bit for a crushed soft coal seam suitable for surface drilling according to the present embodiment is further optimized based on the second embodiment, and the optimization is as follows:
the inside of the water hole 11 is provided with a separation net, the separation net comprises a net ring 71 and a net piece 72 which is arranged in the net ring 71 and can axially swing along the net ring 71, and the inside of the water hole 11 is also provided with a net piece returning device which is used for controlling the net piece 72 to stretch.
The mesh returning device comprises a net rack 73 and an extensible member 74, wherein the fixed end of the extensible member 74 is connected with the center of the net rack 73, and the extensible end of the extensible member 74 is fixedly connected with the center of the mesh 72.
During coring, the high-pressure drilling fluid sprayed from the port 11 impacts the mesh 72 to extend the mesh 72 to the front side of the port 11, and when the port 11 stops spraying the drilling fluid, the mesh 72 is pulled by the telescopic member 74 to extend to the rear side of the port 11.
The airtight core bit of getting in of garrulous soft coal seam suitable for ground drilling that this embodiment provided can avoid the coal cinder to get into through water hole 11 and cause the drilling fluid passageway to block up after getting between drilling body 1 and the coring inner tube, guarantees that the drilling fluid passageway is unblocked.
Although embodiments of the present invention have been shown and described above, it is understood that the above embodiments are exemplary and should not be construed as limiting the present invention, and that variations, modifications, substitutions and alterations can be made to the above embodiments by those of ordinary skill in the art within the scope of the present invention.
Claims (8)
1. The utility model provides an airtight coring bit in garrulous soft coal seam suitable for ground drilling, includes drill bit body (1) of tubular structure, the front end of drill bit body (1) is cavity round platform structure, its characterized in that: the drilling machine also comprises an outer drill bit (2) and an inner drill bit (3);
the drill bit comprises a drill bit body (1), wherein a central hole of the drill bit body (1) is a three-step hole with sequentially increasing apertures from front to back, an outer drill bit (2) is fixedly arranged on the outer annular wall of the front end of the drill bit body (1), a plurality of cutting wings (21) are arranged on the outer annular wall of the outer drill bit (2) at intervals in the circumferential direction, a diversion trench (22) is formed between any two adjacent cutting wings (21), an outer cutting tooth (23) and a diameter-protecting tooth (24) are inlaid in each cutting wing (21), the rear end of an inner drill bit (3) is detachably connected with a small-diameter hole section (124) of the three-step hole, the front end face of the inner drill bit (3) is axially protruded out of the front end face of the outer drill bit (2) along the drill bit body (1), a plurality of inner cutting teeth (31) are arranged on the front end face of the inner drill bit (3), a water hole (11) communicated with the diversion trench (22) is arranged on a first-level step face (126) between, annular groove (125) have been seted up to the great footpath hole section (122) of three shoulder holes on circumference, annular groove (125) are used for installing the sealing washer that cuts off big footpath hole section (121) and less footpath hole section (123).
2. The bit for sealing and coring a broken soft coal seam suitable for ground drilling is characterized in that the rear end of the inner bit (3) is connected with the front end of the bit body (1) through threads.
3. The bit for sealing and coring a broken soft coal seam suitable for ground drilling as claimed in claim 1, wherein the central axis of the water hole (11) is offset from the central axis of the bit body (1) by 8-12 °.
4. The bit as claimed in claim 1, wherein the length between the cutting face of the outer cutting tooth (23) and the cutting face of the inner cutting tooth (31) is not less than 50 mm.
5. The smashed soft coal seam closed core bit suitable for ground drilling according to claim 1, further comprising a pressure spring (4) and an end cap (5), wherein the outer annular wall of the end cap (5) is provided with external threads, and the inner annular wall of the end cap (5) is a circular hole wall matched with the outer annular wall at the rear end of the inner bit (3);
the inner wall of the rear end of a small-diameter hole section (124) of the three stepped holes radially extends inwards to form a first retaining ring (127), the inner wall of the front end of the small-diameter hole section (124) of the three stepped holes is provided with an internal thread, a pressure spring (4) is arranged in the small-diameter hole section (124) of the three stepped holes, the rear end of the pressure spring (4) abuts against the front end face of the first retaining ring (127), a second retaining ring (32) is arranged in the circumferential direction of the outer ring wall of the rear end of the inner drill bit (3), the second retaining ring (32) abuts against the front end of the pressure spring (4), and the inner wall of the small-diameter hole section (124) of the three stepped holes is locked in the small-diameter hole section (124) of the three stepped holes through an end cap (5) arranged.
6. The bit for coring a broken soft coal seam closed hole suitable for ground drilling is characterized in that a screen is arranged in the water hole (11).
7. The airtight core bit for the crushed soft coal seam suitable for ground drilling is characterized in that the separation net comprises a net ring (71) and a net sheet (72) which is arranged in the net ring (71) and can axially swing along the net ring (71), and a net sheet returning device is further arranged in the water hole (11) and is used for controlling the axial swing of the net sheet (72).
8. The airtight core bit for the crushed soft coal seam suitable for ground drilling is characterized in that the mesh return device comprises a net rack (73) and a telescopic piece (74), the net rack (73) is fixedly arranged at the rear side of the net ring (71), the fixed end of the telescopic piece (74) is connected with the center of the net rack (73), and the telescopic end of the telescopic piece (74) is fixedly connected with the center of the mesh (72).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010980185.2A CN112112575B (en) | 2020-09-17 | 2020-09-17 | Garrulous soft coal seam airtight coring bit suitable for ground drilling |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010980185.2A CN112112575B (en) | 2020-09-17 | 2020-09-17 | Garrulous soft coal seam airtight coring bit suitable for ground drilling |
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| CN112112575A true CN112112575A (en) | 2020-12-22 |
| CN112112575B CN112112575B (en) | 2022-09-30 |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114151013A (en) * | 2021-11-19 | 2022-03-08 | 中煤科工集团西安研究院有限公司 | Large-diameter hole expanding drill bit while drilling in underground coal mine |
| CN115874914A (en) * | 2023-02-06 | 2023-03-31 | 陕西晖煌建筑劳务有限公司 | Drilling device for bridge construction |
Citations (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| AU4023995A (en) * | 1994-12-05 | 1996-06-13 | Wallis Industries Pty Ltd | Drill bit |
| JP2004204588A (en) * | 2002-12-26 | 2004-07-22 | Chiken Co Ltd | Geological sampler |
| CN201448058U (en) * | 2009-08-04 | 2010-05-05 | 西安科技大学 | Bottom blowout stepped PDC coal fetching drill bit |
| 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 |
| CN102587855A (en) * | 2012-03-15 | 2012-07-18 | 中南大学 | Core drill suitable for breakable and weak formation |
| CN202417317U (en) * | 2011-12-08 | 2012-09-05 | 邵立峰 | Double-layer coring bit used for coal mine |
| CN203488132U (en) * | 2013-09-23 | 2014-03-19 | 中国有色金属工业昆明勘察设计研究院 | Bag multi-section binding type single-tube core taking drill |
| CN108930517A (en) * | 2018-08-13 | 2018-12-04 | 四川大学 | Hard rock core drill |
| CN109594927A (en) * | 2018-12-21 | 2019-04-09 | 巴州大朴石油技术服务有限公司 | A kind of elastic drill bit for oil exploitation |
-
2020
- 2020-09-17 CN CN202010980185.2A patent/CN112112575B/en active Active
Patent Citations (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| AU4023995A (en) * | 1994-12-05 | 1996-06-13 | Wallis Industries Pty Ltd | Drill bit |
| JP2004204588A (en) * | 2002-12-26 | 2004-07-22 | Chiken Co Ltd | Geological sampler |
| CN201448058U (en) * | 2009-08-04 | 2010-05-05 | 西安科技大学 | Bottom blowout stepped PDC coal fetching drill bit |
| 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 |
| CN202417317U (en) * | 2011-12-08 | 2012-09-05 | 邵立峰 | Double-layer coring bit used for coal mine |
| CN102587855A (en) * | 2012-03-15 | 2012-07-18 | 中南大学 | Core drill suitable for breakable and weak formation |
| CN203488132U (en) * | 2013-09-23 | 2014-03-19 | 中国有色金属工业昆明勘察设计研究院 | Bag multi-section binding type single-tube core taking drill |
| CN108930517A (en) * | 2018-08-13 | 2018-12-04 | 四川大学 | Hard rock core drill |
| CN109594927A (en) * | 2018-12-21 | 2019-04-09 | 巴州大朴石油技术服务有限公司 | A kind of elastic drill bit for oil exploitation |
Non-Patent Citations (1)
| Title |
|---|
| 孙四清等: "地面井煤层气含量精准测试密闭取心技术及设备", 《煤炭学报》 * |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114151013A (en) * | 2021-11-19 | 2022-03-08 | 中煤科工集团西安研究院有限公司 | Large-diameter hole expanding drill bit while drilling in underground coal mine |
| CN114151013B (en) * | 2021-11-19 | 2023-08-11 | 中煤科工集团西安研究院有限公司 | Underground large-diameter reaming while drilling bit for coal mine |
| CN115874914A (en) * | 2023-02-06 | 2023-03-31 | 陕西晖煌建筑劳务有限公司 | Drilling device for bridge construction |
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