CN108930517B - Hard rock core drill - Google Patents
Hard rock core drill Download PDFInfo
- Publication number
- CN108930517B CN108930517B CN201810917788.0A CN201810917788A CN108930517B CN 108930517 B CN108930517 B CN 108930517B CN 201810917788 A CN201810917788 A CN 201810917788A CN 108930517 B CN108930517 B CN 108930517B
- Authority
- CN
- China
- Prior art keywords
- drill bit
- blade
- stage blade
- stage
- outer core
- 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.)
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Links
- 239000011435 rock Substances 0.000 title claims abstract description 33
- 239000000110 cooling liquid Substances 0.000 claims abstract description 15
- 238000005553 drilling Methods 0.000 claims abstract description 14
- 238000007789 sealing Methods 0.000 claims description 9
- 238000001816 cooling Methods 0.000 abstract description 4
- 238000005299 abrasion Methods 0.000 abstract description 3
- 230000002035 prolonged effect Effects 0.000 abstract description 3
- 238000000034 method Methods 0.000 description 8
- 239000002826 coolant Substances 0.000 description 7
- 238000011161 development Methods 0.000 description 4
- 230000000694 effects Effects 0.000 description 3
- 238000002955 isolation Methods 0.000 description 3
- 238000004321 preservation Methods 0.000 description 3
- 239000000956 alloy Substances 0.000 description 2
- 229910045601 alloy Inorganic materials 0.000 description 2
- 238000010276 construction Methods 0.000 description 2
- 230000008021 deposition Effects 0.000 description 2
- 230000000704 physical effect Effects 0.000 description 2
- 241001074085 Scophthalmus aquosus Species 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000013461 design Methods 0.000 description 1
- 239000012530 fluid Substances 0.000 description 1
- 229910052500 inorganic mineral Inorganic materials 0.000 description 1
- 239000011707 mineral Substances 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 230000035699 permeability Effects 0.000 description 1
- 239000011148 porous material Substances 0.000 description 1
- 238000011160 research Methods 0.000 description 1
- 238000004088 simulation Methods 0.000 description 1
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 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
-
- 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
- E21B25/00—Apparatus for obtaining or removing undisturbed cores, e.g. core barrels or core extractors
Landscapes
- Engineering & Computer Science (AREA)
- Life Sciences & Earth Sciences (AREA)
- Geology (AREA)
- Mining & Mineral Resources (AREA)
- Physics & Mathematics (AREA)
- Environmental & Geological Engineering (AREA)
- Fluid Mechanics (AREA)
- General Life Sciences & Earth Sciences (AREA)
- Geochemistry & Mineralogy (AREA)
- Mechanical Engineering (AREA)
- Processing Of Stones Or Stones Resemblance Materials (AREA)
- Earth Drilling (AREA)
Abstract
The invention relates to a hard rock core drill, which comprises an outer core pipe and a hollow drill bit, wherein the drill bit is arranged at the lower end of the outer core pipe, spiral grooves are formed in the outer walls of the outer core pipe and the drill bit, and the spiral grooves on the drill bit are continuous with the spiral grooves on the outer core pipe; the drill bit comprises an inner drill bit and an outer drill bit, the inner drill bit is arranged in the outer drill bit, the lower end of the inner drill bit is provided with a first-stage blade, the outer wall of the outer drill bit is provided with a second-stage blade, and cooling liquid loop holes are formed in the first-stage blade and the second-stage blade. According to the invention, the drill bit is divided into two-stage blades, the blade at the lowest end firstly drills a small hole, and then the blade above the small hole is used for reaming, so that the drilling speed can be increased, and the coring efficiency can be improved; cooling liquid loop holes are formed in the blade parts, cooling liquid can be sprayed out through the cooling liquid loop holes to cool the blade, so that the cooling speed of the blade is increased, the abrasion of the cutter is reduced, and the service life of the blade is prolonged; the outer core tube is provided with a spiral groove which is continuous with the drill bit, and as the outer core tube is screwed into the rock stratum, the outer core tube creates a closed space for the coring tool, so that the fidelity cabin can be prevented from being polluted.
Description
Technical Field
The invention relates to the technical field of core drilling equipment, in particular to a hard rock core drilling tool.
Background
In the process of oil field exploration, a rock core is important data for finding an oil-gas layer, researching stratum, oil producing layer, oil storage layer, cover layer, structure and the like, and the lithology, physical property, oil content, gas content and aquatic characteristic of the underground rock stratum can be directly known through observation and research on the rock core. After the oil field is put into development, the deposition characteristics of the oil layer are further researched and known through the rock core, and the physical properties, pore structure, wettability, relative permeability and lithofacies characteristics of the oil layer are further researched, and the physical simulation and flooding rules of the oil layer are realized; the oil layer flooding characteristics of different development stages and different water-containing stages are recognized and mastered, the distribution of residual oil is cleared, and scientific basis is provided for the design of oil field development schemes, the adjustment of layers and well patterns and the encryption of wells.
The core taking is to take underground rock to the ground by using a special coring tool in the drilling process, and the agglomerated rock is called a core, so that various properties of the rock can be measured, the underground structure and the rock deposition environment can be intuitively studied, and the fluid properties and the like can be known. In mineral exploration and development, the stratum horizon and depth are needed to be designed according to geology, drilling work is carried out, a coring tool is put into the well, and a rock sample is taken out.
The drilling tool is an indispensable tool for taking the core, the existing coring bit has low drilling speed and low coring efficiency; in addition, the cooling speed of the blade of the coring bit is low, the abrasion of the cutter is high, and the service life of the blade is short.
Disclosure of Invention
The invention aims to provide a hard rock core drill, wherein the drill bit is provided with a secondary blade, so that the drilling speed can be increased, and the core taking efficiency can be improved; the cooling liquid loop holes are arranged to accelerate cooling of the blade, so that the service life of the blade is prolonged.
In order to achieve the above purpose, the invention adopts the following technical scheme:
a hard rock core drill bit includes a hollow drill bit including a first stage blade for drilling a hole and a second stage blade for reaming.
Further, the drill bit comprises an inner drill bit and an outer drill bit, the inner drill bit is arranged in the outer drill bit, the first-stage blade is positioned at the lower end of the inner drill bit, and the second-stage blade is positioned at the outer wall of the outer drill bit.
Further, a first-stage blade avoiding notch is formed in the position, corresponding to the first-stage blade, of the outer drill bit, and the first-stage blade avoiding notch is opened on the front end face of the outer drill bit.
Further, the hard rock core drill bit further comprises an outer core tube, the drill bit is arranged at the lower end of the outer core tube, spiral grooves are formed in the outer core tube and the outer wall of the drill bit, and the spiral grooves on the drill bit are continuous with the spiral grooves on the outer core tube.
Preferably, the first stage blades are equally spaced apart in the circumferential direction by three.
Preferably, the second stage blades are equally spaced apart in the circumferential direction by three.
Further, cooling liquid loop holes are formed in the first-stage blade and the second-stage blade of the drill bit.
Preferably, the coolant loop holes at the second stage blades are bar-shaped holes.
Preferably, the coolant loop hole at the first stage blade is an arc hole, and the arc hole is opened at the front end face of the drill bit.
Furthermore, the inner wall of the drill bit is provided with a sealing ring, and the high-elasticity annular sealing ring is utilized to realize the wrapping of the rock core in the coring process, so that the isolation quality guarantee effect is achieved, and the aims of moisture preservation and quality guarantee are fulfilled.
Wherein, the drill bit is the PCD cutter.
Compared with the prior art, the invention has the following beneficial effects:
1, the drill bit is divided into two-stage blades, a small hole is drilled firstly by the blade at the lowest end, and then the hole is reamed by the blade above, so that the drilling speed can be increased, and the coring efficiency can be improved; cutting rock strata by using a hard alloy sharp-mouth thin-lip drill, reducing disturbance to the stratum in the coring process, and ensuring the integrity and quality of coring;
2, through holes are formed in the blade parts and serve as cooling liquid loop holes, cooling liquid can be sprayed out through the through holes to cool the blade, the cooling speed of the blade is increased, the abrasion of the cutter is reduced, and the service life of the blade is prolonged;
3, a spiral groove continuous with the drill bit is formed in the outer wall of the outer core tube, and the outer core tube creates a closed space for the coring tool along with the rotation of the outer core tube into the rock stratum, so that the fidelity cabin can be prevented from being polluted;
and 4, a sealing ring is arranged on the inner wall of the drill bit, and the high-elasticity annular sealing ring is utilized to wrap the rock core in the coring process, so that the isolation quality guarantee effect is achieved, and the aims of moisture preservation and quality guarantee are fulfilled.
Drawings
FIG. 1 is a schematic view of a drill bit;
FIG. 2 is a schematic view of the construction of the outer drill body;
FIG. 3 is a schematic view of the construction of the inner drill bit body;
FIG. 4 is a schematic view of the structure of the drill bit when mounted on the outer core tube;
in the figure: 1-drill bit, 2-first stage blade, 3-second stage blade, 4-helical groove, 5-outer core pipe, 6-coolant loop hole, 7-first stage blade dodges breach, 8-sealing washer, 11-inner drill bit, 12-outer drill bit, 111-inner drill cutter body, 112-first stage blade mounting groove, 121-outer drill cutter body, 122-second stage blade mounting groove.
Detailed Description
The present invention will be described in further detail with reference to the accompanying drawings, in order to make the objects, technical solutions and advantages of the present invention more apparent.
As shown in fig. 1, 2 and 3, the hard rock core drilling tool disclosed by the invention comprises a hollow drill bit 1, wherein the drill bit 1 is a PCD cutter. The drill bit 1 comprises a primary blade 2 for drilling and a secondary blade 3 for reaming.
The drill bit 1 comprises an inner drill bit 11 and an outer drill bit 12, the inner drill bit 11 comprising first stage blades 2 and a hollow inner drill bit body 111. As shown in fig. 3, a first stage blade mounting groove 112 for mounting the first stage blade 2 is provided at the lower end of the inner drill body 111, the first stage blade mounting groove 112 is opened at the lower end surface of the inner drill body 111, a coolant loop hole 6 is provided at the first stage blade mounting groove 112 on the inner drill body 111, the coolant loop hole 6 is an arc hole, and the arc hole is opened at the front end surface of the drill bit 1 and is communicated with the first stage blade mounting groove 112. Three first-stage blade mounting grooves 112 are formed in the inner drill body 111 at equal intervals in the circumferential direction, cooling liquid loop holes 6 are formed in the positions of each first-stage blade mounting groove 112, and first-stage blades 2 are mounted in each first-stage blade mounting groove 112. The inner wall of the inner drill cutter body 111 is provided with a sealing ring 8, and the high-elasticity annular sealing ring is utilized to realize the wrapping of the rock core in the coring process, so that the isolation quality guarantee effect is achieved, and the aims of moisture preservation and quality guarantee are fulfilled.
The outer drill bit 12 comprises a second stage blade 3 and a hollow outer drill bit body 121. As shown in fig. 2, the outer wall of the secondary blade 3 is provided with a secondary blade mounting groove 122 for mounting the secondary blade 3, the secondary blade mounting groove 122 on the outer drill body 121 is provided with a cooling liquid loop hole 6, and the cooling liquid loop hole 6 is a strip-shaped hole which is communicated with the secondary blade mounting groove 122. The outer drill body 121 is provided with three second-stage blade mounting grooves 122 at equal intervals in the circumferential direction, a cooling liquid loop hole 6 is formed in each second-stage blade mounting groove 122, and a second-stage blade 3 is mounted in each second-stage blade mounting groove 122.
The inner drill bit 11 is arranged in the outer drill bit 12, a first-stage blade avoiding notch 7 is arranged on the outer drill bit body 121 corresponding to the first-stage blade 2, the first-stage blade avoiding notch 7 is arranged on the front end face of the outer drill bit 12, and the cutting edge of the first-stage blade 2 is exposed out of the outer drill bit body 121 from the first-stage blade avoiding notch 7. The thickness of the blade in this embodiment is 3.2mm.
The drill bit is divided into the two-stage blades, the first-stage blade 2 at the lowest end firstly drills small holes, and the second-stage blade 3 above the small holes reams holes, so that the drilling speed can be improved. Through holes are provided in the blade portions as coolant circuit holes 6 through which coolant can be sprayed to cool the blade. The invention uses the hard alloy sharp-mouth thin-lip drill bit to cut rock strata, reduces disturbance to the stratum in the coring process, and ensures the integrity and quality of coring.
As shown in fig. 4, in another embodiment, the hard rock core drill further includes an outer core tube 5, the drill bit 1 is mounted at the lower end of the outer core tube 5, the upper end of the outer drill bit body 121 is connected with the lower end of the outer core tube 5, the outer core tube 5 and the outer wall of the outer drill bit body 121 are both provided with spiral grooves 4, and the spiral grooves 4 on the outer drill bit body 121 are continuous with the spiral grooves 4 on the outer core tube 5. The outer core pipe 5 of the outer wall setting up helical groove 4 is equivalent to the spiral outer brill, along with outer core pipe 5 screw in stratum, and outer core pipe 5 creates a confined space for coring tool, and sealing washer 8 is in the parcel of coring in-process to the rock core, prevents that the fidelity cabin from being polluted.
There are, of course, many other embodiments of the invention that can be made by those skilled in the art in light of the above teachings without departing from the spirit or essential scope thereof, but that such modifications and variations are to be considered within the scope of the appended claims.
Claims (7)
1. The hard rock core drill is characterized by comprising a hollow drill bit (1), wherein the drill bit (1) comprises a first-stage blade (2) for drilling and a second-stage blade (3) for reaming;
the drill bit (1) comprises an inner drill bit (11) and an outer drill bit (12), the inner drill bit (11) is arranged in the outer drill bit (12), the first-stage blade (2) is positioned at the lower end of the inner drill bit (11), and the second-stage blade (3) is positioned at the outer wall of the outer drill bit (12);
a first-stage blade avoiding notch (7) is arranged on the outer drill bit (12) corresponding to the first-stage blade (2), the first-stage blade avoiding notch (7) is opened on the front end surface of the outer drill bit (12), and the cutting edge of the first-stage blade (2) is exposed out of the outer drill bit body (121) from the first-stage blade avoiding notch (7);
still include outer core pipe (5), drill bit (1) are installed in outer core pipe (5) lower extreme, outer core pipe (5) and drill bit (1) outer wall all are equipped with helicla flute (4), and helicla flute (4) on drill bit (1) are continuous with helicla flute (4) on outer core pipe (5).
2. The hard rock core drill bit as recited in claim 1, wherein: the first-stage blades (2) are arranged at equal intervals in the circumferential direction.
3. The hard rock core drill bit as recited in claim 1, wherein: the second-stage blades (3) are equally spaced in the circumferential direction.
4. The hard rock core drill bit as recited in claim 1, wherein: the first stage blade (2) and the second stage blade (3) on the drill bit (1) are provided with cooling liquid loop holes (6).
5. A hard rock core drill bit as recited in claim 4, wherein: the cooling liquid loop hole (6) at the second-stage blade (3) is a strip-shaped hole, the cooling liquid loop hole (6) at the first-stage blade (2) is an arc-shaped hole, and the arc-shaped hole is opened on the front end face of the drill bit (1).
6. The hard rock core drill bit as recited in claim 1, wherein: the inner wall of the drill bit (1) is provided with a sealing ring (8).
7. The hard rock core drill bit as recited in claim 1, wherein: the drill bit (1) is a PCD cutter.
Priority Applications (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810917788.0A CN108930517B (en) | 2018-08-13 | 2018-08-13 | Hard rock core drill |
| PCT/CN2018/108970 WO2020034349A1 (en) | 2018-08-13 | 2018-09-30 | Hard rock coring drilling tool |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810917788.0A CN108930517B (en) | 2018-08-13 | 2018-08-13 | Hard rock core drill |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN108930517A CN108930517A (en) | 2018-12-04 |
| CN108930517B true CN108930517B (en) | 2024-03-22 |
Family
ID=64445319
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201810917788.0A Active CN108930517B (en) | 2018-08-13 | 2018-08-13 | Hard rock core drill |
Country Status (2)
| Country | Link |
|---|---|
| CN (1) | CN108930517B (en) |
| WO (1) | WO2020034349A1 (en) |
Families Citing this family (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109973034B (en) * | 2018-12-26 | 2024-04-19 | 深圳大学 | Rock sample in-situ fidelity coring system |
| CN109973035B (en) * | 2018-12-26 | 2024-04-12 | 深圳大学 | Rock sample fidelity core taking system |
| CN110714720B (en) * | 2019-11-04 | 2020-11-24 | 重庆地质矿产研究院 | Drilling device for shale gas exploitation survey |
| CN112112575B (en) * | 2020-09-17 | 2022-09-30 | 中煤科工集团西安研究院有限公司 | Garrulous soft coal seam airtight coring bit suitable for ground drilling |
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Also Published As
| Publication number | Publication date |
|---|---|
| WO2020034349A1 (en) | 2020-02-20 |
| CN108930517A (en) | 2018-12-04 |
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