CN113006703A - Wear-resistant PDC-roller composite drill bit - Google Patents
Wear-resistant PDC-roller composite drill bit Download PDFInfo
- Publication number
- CN113006703A CN113006703A CN202110350625.0A CN202110350625A CN113006703A CN 113006703 A CN113006703 A CN 113006703A CN 202110350625 A CN202110350625 A CN 202110350625A CN 113006703 A CN113006703 A CN 113006703A
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- 239000002131 composite material Substances 0.000 title claims abstract description 22
- 230000007246 mechanism Effects 0.000 claims abstract description 23
- 230000036346 tooth eruption Effects 0.000 claims abstract description 6
- 239000003921 oil Substances 0.000 claims description 27
- 238000005520 cutting process Methods 0.000 claims description 18
- 238000003860 storage Methods 0.000 claims description 14
- 229910000831 Steel Inorganic materials 0.000 claims description 13
- 239000010959 steel Substances 0.000 claims description 13
- 239000012530 fluid Substances 0.000 claims description 4
- 239000010687 lubricating oil Substances 0.000 claims description 4
- 239000011248 coating agent Substances 0.000 claims description 3
- 238000000576 coating method Methods 0.000 claims description 3
- 238000000034 method Methods 0.000 claims description 3
- MTPVUVINMAGMJL-UHFFFAOYSA-N trimethyl(1,1,2,2,2-pentafluoroethyl)silane Chemical compound C[Si](C)(C)C(F)(F)C(F)(F)F MTPVUVINMAGMJL-UHFFFAOYSA-N 0.000 claims description 3
- 238000005240 physical vapour deposition Methods 0.000 claims description 2
- 230000008569 process Effects 0.000 claims description 2
- 230000002265 prevention Effects 0.000 abstract description 2
- 238000005553 drilling Methods 0.000 description 13
- 238000009434 installation Methods 0.000 description 7
- 239000011435 rock Substances 0.000 description 5
- 238000005516 engineering process Methods 0.000 description 4
- 150000001875 compounds Chemical class 0.000 description 2
- 230000007547 defect Effects 0.000 description 2
- 239000007788 liquid Substances 0.000 description 2
- VNWKTOKETHGBQD-UHFFFAOYSA-N methane Chemical compound C VNWKTOKETHGBQD-UHFFFAOYSA-N 0.000 description 2
- 241001391944 Commicarpus scandens Species 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000000903 blocking effect Effects 0.000 description 1
- 230000008859 change Effects 0.000 description 1
- 238000004512 die casting Methods 0.000 description 1
- 230000017525 heat dissipation Effects 0.000 description 1
- 239000003345 natural gas Substances 0.000 description 1
- 239000003209 petroleum derivative Substances 0.000 description 1
- 239000007858 starting material Substances 0.000 description 1
- 230000001360 synchronised effect Effects 0.000 description 1
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Classifications
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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
- E21B10/46—Drill bits characterised by wear resisting parts, e.g. diamond inserts
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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
-
- 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
- E21B10/46—Drill bits characterised by wear resisting parts, e.g. diamond inserts
- E21B10/50—Drill bits characterised by wear resisting parts, e.g. diamond inserts the bit being of roller type
-
- 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
- E21B10/62—Drill bits characterised by parts, e.g. cutting elements, which are detachable or adjustable
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
- Y02P70/00—Climate change mitigation technologies in the production process for final industrial or consumer products
- Y02P70/10—Greenhouse gas [GHG] capture, material saving, heat recovery or other energy efficient measures, e.g. motor control, characterised by manufacturing processes, e.g. for rolling metal or metal working
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- 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)
- Earth Drilling (AREA)
Abstract
The invention discloses a wear-resistant PDC-roller bit composite drill bit, which comprises a PDC drill bit and a single roller bit, wherein a threaded hole is formed in the length direction of the PDC drill bit, and the single roller bit is arranged in the threaded hole through threads; the PDC drill bit comprises a drill bit body, a plurality of blades are uniformly distributed on the circumference of the drill bit body, and a plurality of PDC cutting teeth are fixedly embedded in the blades; a first auxiliary flow channel communicated with a first main flow channel in the drill bit body is formed in the drill bit body between the two adjacent blades; a circle of semicircular grooves formed in the thread section of the single cone bit and a limiting mechanism which is arranged on each blade, is matched with the semicircular grooves and is used for limiting the looseness of the PDC bit and the single cone bit. The single roller bit and the PDC bit have the advantages of good connection stability, blockage prevention of a flow channel, good wear resistance and the like.
Description
Technical Field
The invention relates to a drill bit for drilling petroleum and natural gas, in particular to a wear-resistant PDC-roller cone composite drill bit.
Background
The drilling and reaming technology is a new drilling technology which is started in recent years, adopts the principle that a reaming-while-drilling tool is used for drilling and reaming simultaneously, and finally achieves the purpose that the size of a borehole is larger than that of a pilot bit so as to achieve the purposes of reducing the size of an open hole and increasing the size of a well completion. At present, in order to be matched with an expansion pipe technology and the application of an unconventional well deep structure, the technology of concentric reaming while drilling abroad is developed rapidly. The concentric reaming while drilling can improve the drilling speed by two factors, namely, the rock stress at the reaming step is concentrated and is easy to break; secondly, the pilot drill bit is smaller, and enough mechanical energy can be obtained.
The existing concentric reaming while drilling mainly comprises a single cone bit and a PDC bit, wherein the single cone bit and the PDC bit are partially integrated, and the single cone bit and the PDC bit are partially connected into a whole by threads; although both connection methods have the advantages of drilling and expanding simultaneously, the following defects still exist when in use:
when the single cone bit and the PDC bit are arranged into a whole, the stability of the single cone bit and the PDC bit can be ensured during reaming, but after any one of the single cone bit and the PDC bit is damaged, the single cone bit and the PDC bit can only be integrally scrapped and cannot be replaced; threaded connection mode as an organic whole, though can satisfy the replaceability after damaging during reaming, the stability of single cone bit and PDC drill bit is not good enough, if the reversal appears when the drill bit chucking, makes two parts appear becoming flexible very easily, influences the breakage to the rock mass.
Disclosure of Invention
Aiming at the defects in the prior art, the invention provides a wear-resistant PDC-roller cone composite bit, which solves the problem of poor connection stability of a single-roller cone bit and a PDC bit in the prior art.
In order to achieve the purpose of the invention, the invention adopts the technical scheme that:
the wear-resistant PDC-roller cone composite drill bit comprises a PDC drill bit and a single-roller cone drill bit, wherein a threaded hole is formed in the length direction of the PDC drill bit, and the single-roller cone drill bit is installed in the threaded hole through threads; the PDC drill bit comprises a drill bit body, a plurality of blades are uniformly distributed on the circumference of the drill bit body, and a plurality of PDC cutting teeth are fixedly embedded in the blades;
a first auxiliary flow channel communicated with a first main flow channel in the drill bit body is formed in the drill bit body between the two adjacent blades; a circle of semicircular grooves formed in the thread section of the single cone bit and a limiting mechanism which is arranged on each blade, is matched with the semicircular grooves and is used for limiting the looseness of the PDC bit and the single cone bit;
the limiting mechanism comprises gauge teeth and a step hole which is formed in the position, corresponding to the semicircular groove, of the blade and communicated with the threaded hole; the stepped hole comprises a first round hole, a second round hole and a third round hole which are communicated from outside to inside, and the diameter of the second round hole is smaller than that of the first round hole and that of the third round hole; a connecting rod is movably arranged in the second round hole, and two ends of the connecting rod extend into the first round hole and the third round hole;
the end part of the connecting rod, which is positioned in the third round hole, is welded with a steel ball with the diameter equal to that of the semicircular groove; threaded sections with opposite rotation directions are formed in the side wall of the first round hole and the end part of the connecting rod, which is positioned in the first round hole; the gauge teeth are internally provided with a groove body with threads, the outer surfaces of the gauge teeth, which are sunk into the first round holes, are provided with threads, and the gauge teeth are fixed with the connecting rods through the threads and then fixed with the first round holes through the threads; the surface of the gauge teeth extending out of the first round hole is an arc-shaped surface.
The invention has the beneficial effects that: after this scheme sets up semi-circular recess and stop gear, after single cone bit targets in place through the screw thread installation, will protect the footpath tooth to install at the tip of connecting rod, later through protecting the first round hole of footpath tooth precession, impress the steel ball in semi-circular recess to realize stop gear and to single cone bit axial spacing, guarantee that composite bit is regardless of corotation or reversal, PDC drill bit and single cone bit can not appear becoming flexible.
The unique setting that the diameter of second round hole is less than the third round hole can avoid when changing compound drill bit, and steel ball and connecting rod are extracted from the step hole, the problem that needs the installation once more. First round hole and the opposite unique setting of connecting rod tip screw thread spiral direction can avoid protecting the inside and outside synchronous follow connecting rod of footpath tooth and first round hole and withdraw from, and when appearing protecting the footpath tooth and break away from first round hole and connecting rod completely, the steel ball withdraws from in the full heavy semicircular groove, influences the change between PDC drill bit and the single cone bit.
This scheme stop gear's gauge tooth can regard as the steel ball to impress and the starter block who spirals out on the one hand, and when on the other hand gauge tooth bellied cambered surface structure that makes progress contacted with the wall of a well, the frictional resistance that receives when can reducing compound drill bit and the wall of a well contact.
Drawings
FIG. 1 is a perspective view of a wear resistant PDC-roller cone composite drill bit.
FIG. 2 is a cross-sectional view of a wear resistant PDC-roller cone composite bit.
Fig. 3 is an enlarged view of a portion a in fig. 2.
Fig. 4 is an enlarged view of a portion B in fig. 2.
Fig. 5 is a top view of a disc-shaped cutting insert.
Wherein, 1, PDC drill bit; 11. a threaded hole; 12. a drill bit body; 13. a blade; 131. PDC cutting teeth; 14. a first main flow passage; 15. a first auxiliary flow channel; 16. a limiting mechanism; 161. gauge protection teeth; 162. a stepped bore; 1621. a third circular hole; 163. a connecting rod; 164. steel balls; 17. an anti-blocking mechanism; 171. a first bearing; 172. a disc-shaped cutting blade; 1721. a mandrel; 1722. an outer ring body; 1723. a cutting insert;
2. a single cone drill bit; 21. a cone body; 22. a second bearing; 23. a cone; 24. a storage chamber; 25. an oil passage; 26. an oil storage mechanism; 261. a wear-resistant block; 262. a linker; 263. an oil pocket; 264. a nozzle tip; 27. a semicircular groove; 28. a second main flow passage; 29. a second auxiliary flow passage.
Detailed Description
The following description of the embodiments of the present invention is provided to facilitate the understanding of the present invention by those skilled in the art, but it should be understood that the present invention is not limited to the scope of the embodiments, and it will be apparent to those skilled in the art that various changes may be made without departing from the spirit and scope of the invention as defined and defined in the appended claims, and all matters produced by the invention using the inventive concept are protected.
As shown in fig. 1 and 2, the wear-resistant PDC-cone 23 composite drill bit provided by the scheme comprises a PDC drill bit 1 and a single cone 23 drill bit 2, wherein a threaded hole 11 is formed in the PDC drill bit 1 in the length direction, and the single cone 23 drill bit 2 is installed in the threaded hole 11 through threads; the PDC drill bit 1 and the single cone 23 drill bit 2 are connected through threads, and can be replaced in time after any one of the two parts is damaged, so that the utilization rate of the drill bit is guaranteed.
As shown in fig. 2 and 4, the single cone 23 bit 2 comprises a cone 23 body 21 and a cone 23 mounted on an extension shaft of the cone 23 body 21 through a second bearing 22, wherein a plurality of PDC cutting teeth 131 are uniformly distributed on the cone 23; the body 21 of the cone 23 is provided with a storage cavity 24 and an oil passage 25 which is communicated with the storage cavity 24 and extends to the second bearing 22, and an oil storage mechanism 26 which provides lubricating oil for the second bearing 22 is installed in the storage cavity 24.
When the composite drill bit rotates at a high speed, the generated centripetal force can throw out the lubricating oil in the oil storage mechanism 26 and the lubricating oil enters the second bearing 22 through the oil passage 25 to moisten the second bearing 22, so that the smoothness of the rotation of the cone 23 body 21 is ensured.
As shown in fig. 4, in this embodiment, it is preferable that the oil storage mechanism 26 includes a cylindrical wear-resistant block 261 and a connecting body 262 with a thread on the outer surface, an oil bag 263 is installed at the lower end of the connecting body 262, and an oil nozzle 264 on the oil bag 263 extends into the oil passage 25;
the wear-resisting block 261 is internally provided with a mounting groove, the outer surface of the wear-resisting block 261 and the mounting groove are both provided with threads with opposite turning directions, and the wear-resisting block 261 is fixed with the connecting body 262 through the threads and then is fixed with the mounting groove through the threads; the surface of the wear-resistant block 261 extending out of the mounting groove is an arc-shaped surface.
Description of installation of the oil reservoir 26: firstly, a nozzle 264 of an oil bag 263 is installed in the oil passage 25, then a wear-resistant block 261 is installed together with a connecting body 262, then the oil bag 263 is completely pressed into the installation groove, the wear-resistant block 261 is rotated, and the wear-resistant block 261 is fixedly installed in the installation groove, so that the oil storage mechanism 26 is installed.
The wear-resistant block 261 mainly has the following functions: one of them is convenient to install or remove the connecting body 262 and the oil bag 263 by rotating; secondly, the oil bag 263 is encapsulated and protected, so that the oil bag 263 is prevented from being damaged by rock debris generated when the single cone 23 drill bit 2 drills; thirdly, wear resistant blocks 261 may improve the wear resistance of cone 23 body 21 where no PDC teeth are provided, to improve the service life of cone 23 body 21.
The PDC drill bit 1 comprises a drill bit body 12, a plurality of blades 13 are uniformly distributed on the circumference of the drill bit body 12, and a plurality of PDC cutting teeth 131 are fixedly embedded in the blades 13; a first auxiliary flow passage 15 communicated with a first main flow passage 14 inside the drill bit body 12 is formed on the drill bit body 12 between two adjacent blades 13.
A circle of semicircular grooves 27 formed in the thread section of the bit 2 of the single cone 23 and a limiting mechanism 16 which is arranged on each blade 13, is matched with the semicircular grooves 27 and is used for limiting the looseness of the PDC bit 1 and the bit 2 of the single cone 23. The arrangement of the limiting mechanism 16 can ensure that the PDC drill bit 1 and the single cone 23 drill bit 2 cannot be loosened regardless of the forward rotation or the reverse rotation of the composite drill bit.
As shown in fig. 2 and 3, the limiting mechanism 16 includes gauge teeth 161 and a stepped hole 162 formed at a position of the blade 13 corresponding to the semicircular groove 27 and communicated with the threaded hole 11; the stepped hole 162 includes a first circular hole, a second circular hole and a third circular hole 1621 which are communicated from outside to inside, and the diameter of the second circular hole is smaller than the diameters of the first circular hole and the third circular hole 1621; the connecting rod 163 is movably installed in the second circular hole, and two ends of the connecting rod 163 extend into the first circular hole and the third circular hole 1621.
The diameter of the second round hole is smaller than that of the third round hole 1621, so that the problem that the steel ball 164 and the connecting rod 163 need to be installed again when the composite drill bit is replaced due to the fact that the steel ball 164 and the connecting rod 163 are pulled out of the step hole 162 can be solved. The second circular hole is smaller than the diameter of the first circular hole, so that smooth installation of the gauge teeth 161 can be ensured.
The end of the connecting rod 163 in the third round hole 1621 is welded with a steel ball 164 with the diameter equal to that of the semicircular groove 27; threaded sections with opposite rotation directions are formed in the side wall of the first round hole and the end part, located in the first round hole, of the connecting rod 163; the gauge teeth 161 are internally provided with a groove body with threads, the outer surface sunk into the first round hole is provided with threads, and the gauge teeth 161 are fixed with the connecting rod 163 through the threads and then fixed with the first round hole through the threads; the surface of the gauge teeth 161 extending out of the first circular hole is an arc-shaped surface.
Description of installation of the stopper mechanism 16: placing the welded structure of the steel ball 164 and the connecting rod 163 into the stepped hole 162 from the threaded hole 11, and extending the connecting rod 163 into the first circular hole; then pulling the connecting rod to make the thread section of the connecting rod located outside the third round hole 1621, and installing the gauge teeth 161 at the end of the connecting rod 163; after the steel balls 164 are completely located in the third round holes 1621, the single cone 23 drill bit 2 is fixedly installed in the threaded hole 11 of the PDC drill bit 1, and then the gauge protection teeth 161 are rotated to enable the gauge protection teeth 161 to enter the first round holes, so that the steel balls 164 completely enter the semicircular grooves 27 when the gauge protection teeth 161 are screwed in, and the PDC drill bit 1 and the single cone 23 drill bit 2 are limited.
As shown in fig. 2 and 3, the drill bit 2 of the mono-cone 23 further comprises a second main flow passage 28 communicated with the first main flow passage 14, the second main flow passage 28 is communicated with a second auxiliary flow passage 29 on the drill bit 2 of the mono-cone 23, and the extension line of the second auxiliary flow passage 29 intersects. When the single cone 23 drill bit 2 rotates through the second bearing 22, the liquid flowing out from the second auxiliary flow passage 29 quickly can wash the surface of the cone 23 so as to prevent the debris from being clamped on the surface of the cone 23 and influencing the drilling speed of the cone 23.
As shown in fig. 3, the anti-blocking mechanism 17 is installed at the end of each of the first auxiliary flow passage 15 and the second auxiliary flow passage 29, the anti-blocking mechanism 17 includes a first bearing 171 in interference fit with the first auxiliary flow passage 15/the second auxiliary flow passage 29, a disc-shaped cutting blade 172 is welded to an inner ring of the first bearing 171, and a passage for fluid to pass through is formed on the disc-shaped cutting blade 172.
After the anti-blocking mechanism 17 is installed, the fluid of the first auxiliary flow channel 15 and the second auxiliary flow channel 29 which enter from the first main flow channel 14 quickly can drive the disc-shaped cutting knife 172 to rotate, and the entering rock debris can be cut when the disc-shaped cutting knife 172 rotates quickly, so that the rock debris is prevented from blocking the flow channels, liquid outflow is influenced, heat dissipation of the composite drill bit is further influenced, and the drilling speed of the composite drill bit is guaranteed.
As shown in fig. 5, the disc-shaped cutting blade 172 includes a mandrel 1721 and an outer ring body 1722 welded to the inner ring of the bearing, a cutting blade 1723 is connected between the outer ring body 1722 and the mandrel 1721, and a channel is a gap between adjacent cutting blades 1723; the sum of the projections of all the channels on the circular surface of the outer ring body 1722 is equal to or greater than the sum of the projections of all the cutting blades 1723 on the circular surface of the outer ring body 1722.
The disc-shaped cutting blades 172 may be formed integrally, such as by die casting; the unique arrangement of the channel and the projection of the cutting blade 1723 allows the fluid to pass through the channel smoothly while having a sufficiently high flow velocity to ensure rapid rotation of the impeller.
In implementation, the external surface of the part, which is not arranged in the threaded hole 11, of the single cone 23 drill bit 2 is preferably deposited with a titanium carbide coating by a physical vapor deposition process. The introduction of the titanium carbide coating can ensure the wear resistance of the single cone 23 drill bit 2 during drilling, thereby ensuring the service life of the single cone 23 drill bit.
In conclusion, the single cone 23 drill bit 2 and the PDC drill bit 1 have the advantages of good connection stability, blockage prevention of a flow channel, good wear resistance and the like.
Claims (7)
1. A wear-resistant PDC-roller cone composite drill bit comprises a PDC drill bit and a single roller cone drill bit, wherein a threaded hole is formed in the length direction of the PDC drill bit, and the single roller cone drill bit is installed in the threaded hole through threads; the PDC drill bit comprises a drill bit body, a plurality of blades are uniformly distributed on the circumference of the drill bit body, and a plurality of PDC cutting teeth are fixedly embedded in the blades;
a first auxiliary flow channel communicated with a first main flow channel in the drill bit body is formed in the drill bit body between the two adjacent blades; the PDC bit is characterized in that a circle of semicircular grooves are formed in the thread section of the single cone bit, and a limiting mechanism which is matched with the semicircular grooves and used for limiting the looseness of the PDC bit and the single cone bit is arranged on each blade;
the limiting mechanism comprises gauge teeth and a step hole which is formed in the position, corresponding to the semicircular groove, of the blade and communicated with the threaded hole; the stepped hole comprises a first round hole, a second round hole and a third round hole which are communicated from outside to inside, and the diameter of the second round hole is smaller than that of the first round hole and that of the third round hole; a connecting rod is movably arranged in the second round hole, and two ends of the connecting rod extend into the first round hole and the third round hole;
the end part of the connecting rod, which is positioned in the third round hole, is welded with a steel ball with the diameter equal to that of the semicircular groove; the side wall of the first round hole and the end part of the connecting rod, which is positioned in the first round hole, are provided with thread sections with opposite rotation directions; the gauge teeth are internally provided with a groove body with threads, the outer surfaces of the gauge teeth, which are sunk into the first round holes, are provided with threads, and the gauge teeth are fixed with the connecting rods through the threads and then fixed with the first round holes through the threads; the surface of the gauge teeth extending out of the first round hole is an arc-shaped surface.
2. The wear resistant PDC-cone composite drill bit of claim 1 further comprising a second primary flow passage in communication with the first primary flow passage, the second primary flow passage in communication with a second secondary flow passage in the single cone drill bit, wherein the extension of the second secondary flow passage intersects.
3. The wear-resistant PDC-cone composite drill bit of claim 2, wherein the ends of the first and second auxiliary flow passages are each provided with an anti-blocking mechanism, the anti-blocking mechanism comprises a first bearing in interference fit with the first/second auxiliary flow passages, a disc-shaped cutting blade is welded to an inner ring of the first bearing, and a channel for fluid to pass through is formed in the disc-shaped cutting blade.
4. The wear-resistant PDC-cone composite drill bit of claim 3 wherein the disc-shaped cutters include a mandrel and an outer ring body welded to the bearing inner ring, cutting blades are connected between the outer ring body and the mandrel, and the channels are gaps between adjacent cutting blades; the projection sum of all the channels on the circular surface of the outer ring body is more than or equal to the projection sum of all the cutting blades on the circular surface of the outer ring body.
5. The wear-resistant PDC-cone composite drill bit of claim 1, wherein the single cone drill bit comprises a cone body and a cone mounted on an extension shaft of the cone body through a second bearing, the cone body is provided with a storage cavity and an oil passage communicated with the storage cavity and extending to the second bearing, and an oil storage mechanism for providing lubricating oil for the second bearing is mounted in the storage cavity.
6. The wear-resistant PDC-cone composite drill bit of claim 5, wherein the oil storage mechanism comprises a cylindrical wear-resistant block and a connecting body with a thread on the outer surface, an oil bag is mounted at the lower end of the connecting body, and an oil nozzle on the oil bag extends into the oil passage;
the wear-resistant block is internally provided with a mounting groove, the outer surface of the wear-resistant block and the mounting groove are both provided with threads with opposite rotation directions, and the wear-resistant block is fixed with the mounting groove through the threads after being fixed with the connecting body through the threads; the surface of the wear-resistant block extending out of the mounting groove is an arc-shaped surface.
7. A wear resistant PDC-roller composite drill bit according to any of claims 1-6 wherein the outer surface of the portion of the single roller cone drill bit not mounted in the threaded bore is deposited with a titanium carbide coating using a physical vapor deposition process.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110350625.0A CN113006703B (en) | 2021-03-31 | 2021-03-31 | Wear-resistant PDC-roller cone composite drill bit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110350625.0A CN113006703B (en) | 2021-03-31 | 2021-03-31 | Wear-resistant PDC-roller cone composite drill bit |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN113006703A true CN113006703A (en) | 2021-06-22 |
| CN113006703B CN113006703B (en) | 2023-09-12 |
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| CN202110350625.0A Active CN113006703B (en) | 2021-03-31 | 2021-03-31 | Wear-resistant PDC-roller cone composite drill bit |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN117948045A (en) * | 2024-03-27 | 2024-04-30 | 山东省煤田地质局第四勘探队 | Reversible double-tube coring bit for tunnel complex stratum |
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| CN117948045A (en) * | 2024-03-27 | 2024-04-30 | 山东省煤田地质局第四勘探队 | Reversible double-tube coring bit for tunnel complex stratum |
| CN117948045B (en) * | 2024-03-27 | 2024-06-11 | 山东省煤田地质局第四勘探队 | Reversible double-tube coring bit for tunnel complex stratum |
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