CA3050791C - Highly-efficient composite drill bit for formation difficult to drill in deep well - Google Patents
Highly-efficient composite drill bit for formation difficult to drill in deep well Download PDFInfo
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- CA3050791C CA3050791C CA3050791A CA3050791A CA3050791C CA 3050791 C CA3050791 C CA 3050791C CA 3050791 A CA3050791 A CA 3050791A CA 3050791 A CA3050791 A CA 3050791A CA 3050791 C CA3050791 C CA 3050791C
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- fixedly arranged
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- crown portion
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- 239000002131 composite material Substances 0.000 title claims abstract description 15
- 230000015572 biosynthetic process Effects 0.000 title claims abstract description 14
- 239000012530 fluid Substances 0.000 claims abstract description 29
- 230000007246 mechanism Effects 0.000 claims abstract description 10
- 230000036346 tooth eruption Effects 0.000 claims description 23
- 229910000831 Steel Inorganic materials 0.000 claims description 21
- 239000010959 steel Substances 0.000 claims description 21
- 238000003801 milling Methods 0.000 claims description 8
- 239000011435 rock Substances 0.000 description 15
- 238000005755 formation reaction Methods 0.000 description 11
- 238000005553 drilling Methods 0.000 description 7
- 230000000694 effects Effects 0.000 description 4
- 238000000034 method Methods 0.000 description 3
- 229910003460 diamond Inorganic materials 0.000 description 2
- 239000010432 diamond Substances 0.000 description 2
- 238000004519 manufacturing process Methods 0.000 description 2
- 239000003208 petroleum Substances 0.000 description 2
- 230000002035 prolonged effect Effects 0.000 description 2
- ATJFFYVFTNAWJD-UHFFFAOYSA-N Tin Chemical compound [Sn] ATJFFYVFTNAWJD-UHFFFAOYSA-N 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 230000007774 longterm Effects 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 230000000087 stabilizing effect Effects 0.000 description 1
Abstract
ABSTRACT A highly-efficient composite drill bit for a formation difficult to drill in a deep well is disclosed. The drill bit comprises a drill bit body, bit cones and nozzle anti-blocking mechanisms, wherein a fluid cavity is formed inside the drill bit body; a crown portion is arranged at the bottom of the drill bit body; a conical drill bit is fixedly arranged on the bottom surface of the crown portion and located in the center of the crown portion; a plurality of nozzles which are distributed around the conical drill bit are arranged on the bottom surface of the crown portion, each nozzle being communicated with the fluid cavity; a plurality of main blade wings are fixedly arranged on the bottom surface of the crown portion along the circumferential direction of the drill bit body; an auxiliary blade wing is fixedly arranged betwecn every two adjacent main blade wings. CA 3050791 2019-07-30
Description
HIGHLY-EFFICIENT COMPOSITE DRILL BIT FOR FORMATION
DIFFICULT TO DRILL IN DEEP WELL
TECHNICAL FIELD
The present invention relates to the technical field of PDC speed-up drill bit structures, in particular to a highly-efficient composite drill bit for a formation difficult to drill in a deep well.
BACKGROUND
DC drill bits and diamond drill bits are used more and more widely in petroleum and geological drilling, can achieve good use effects and good economic benefits in hard formations, and thus are extensively valued by the petroleum and geological communities. The designs of conventional PDC drill bits and diamond drill bits are based on the principle of balanced design. The crown shapes such as a deep cone and a double cone, which serve as the passive anti-slant technology, are applied to the design and play certain centering and stabilizing effects. At present, the PDC
drill bit is mainly composed of a drill bit body (carcass), PDC cutting teeth, a nozzle, a gauge protection material, a connector and the like. The formation is cut by means of PDC
cutting teeth to achieve drilling. The nozzle is a hydraulic passage between an inner cavity of the drill bit and the outside. The main functions of the nozzle are to clean the bottom of the well, to carry rock debris away from the bottom of the well, to prevent drilling bit balling, to reduce repeated cutting, to improve the rock breaking efficiency, and further to play a hydraulic rock breaking effect under certain drilling parameters.
During operation, a drill bit body that rotates at a high speed drives the PDC
cutting teeth to rotate at a high speed to cut the hard formation, and meanwhile, the fluid ejected from the nozzle discharges the debris from the shaftway.
However, during the process of cutting the hard formation, due to the excessive hardness and large size of a rock, the PDC cutting teeth are damaged. The long-term use will also cause fatigue damage of the PDC cutting teeth and shorten the service life of the drill bit. However, after the PDC cutting teeth are damaged, it is necessary to replace the new drill bit, which seriously reduces the rock breaking efficiency. In addition, during the drilling of the hard formation by the drill bit, the generated debris is just stuck in the nozzle, so that fluid that is introduced into the drill bit body cannot be smoothly ejected from the nozzle, and the PDC cutting teeth cannot be cooled.
Meanwhile, the debris cannot be removed from the shaftway, which further reduces the rock breaking efficiency.
SUMMARY
TECHNICAL PROBLEM
An objective of the present invention is to overcome the defects of the prior art, and to provide a highly-efficient composite drill bit for a formation difficult to drill in a deep well, which has the advantages that the structure is compact, the rock breaking efficiency is improved, the service life of PDC cutting teeth is prolonged, nozzles can be prevented from being blocked by rocks or debris, and the manufacturing cost is low.
SOLUTION TO PROBLEMS
TECHNCIAL SOLUTION
The objective of the present invention is achieved by the following technical solution: a highly-efficient composite drill bit for a formation difficult to drill in a deep well comprises a drill bit body, bit cones and nozzle anti-blocking mechanisms, wherein a fluid cavity is formed inside the drill bit body; a crown portion is arranged at the bottom of the drill bit body; a conical drill bit is fixedly arranged on the bottom surface of the crown portion and located in the center of the crown portion; a plurality of nozzles which are distributed around the conical drill bit are arranged on the bottom surface of the crown portion, each nozzle being communicated with the fluid cavity; a plurality of main blade wings are fixedly arranged on the bottom surface of the crown portion along the circumferential direction of the drill bit body;
an auxiliary
DIFFICULT TO DRILL IN DEEP WELL
TECHNICAL FIELD
The present invention relates to the technical field of PDC speed-up drill bit structures, in particular to a highly-efficient composite drill bit for a formation difficult to drill in a deep well.
BACKGROUND
DC drill bits and diamond drill bits are used more and more widely in petroleum and geological drilling, can achieve good use effects and good economic benefits in hard formations, and thus are extensively valued by the petroleum and geological communities. The designs of conventional PDC drill bits and diamond drill bits are based on the principle of balanced design. The crown shapes such as a deep cone and a double cone, which serve as the passive anti-slant technology, are applied to the design and play certain centering and stabilizing effects. At present, the PDC
drill bit is mainly composed of a drill bit body (carcass), PDC cutting teeth, a nozzle, a gauge protection material, a connector and the like. The formation is cut by means of PDC
cutting teeth to achieve drilling. The nozzle is a hydraulic passage between an inner cavity of the drill bit and the outside. The main functions of the nozzle are to clean the bottom of the well, to carry rock debris away from the bottom of the well, to prevent drilling bit balling, to reduce repeated cutting, to improve the rock breaking efficiency, and further to play a hydraulic rock breaking effect under certain drilling parameters.
During operation, a drill bit body that rotates at a high speed drives the PDC
cutting teeth to rotate at a high speed to cut the hard formation, and meanwhile, the fluid ejected from the nozzle discharges the debris from the shaftway.
However, during the process of cutting the hard formation, due to the excessive hardness and large size of a rock, the PDC cutting teeth are damaged. The long-term use will also cause fatigue damage of the PDC cutting teeth and shorten the service life of the drill bit. However, after the PDC cutting teeth are damaged, it is necessary to replace the new drill bit, which seriously reduces the rock breaking efficiency. In addition, during the drilling of the hard formation by the drill bit, the generated debris is just stuck in the nozzle, so that fluid that is introduced into the drill bit body cannot be smoothly ejected from the nozzle, and the PDC cutting teeth cannot be cooled.
Meanwhile, the debris cannot be removed from the shaftway, which further reduces the rock breaking efficiency.
SUMMARY
TECHNICAL PROBLEM
An objective of the present invention is to overcome the defects of the prior art, and to provide a highly-efficient composite drill bit for a formation difficult to drill in a deep well, which has the advantages that the structure is compact, the rock breaking efficiency is improved, the service life of PDC cutting teeth is prolonged, nozzles can be prevented from being blocked by rocks or debris, and the manufacturing cost is low.
SOLUTION TO PROBLEMS
TECHNCIAL SOLUTION
The objective of the present invention is achieved by the following technical solution: a highly-efficient composite drill bit for a formation difficult to drill in a deep well comprises a drill bit body, bit cones and nozzle anti-blocking mechanisms, wherein a fluid cavity is formed inside the drill bit body; a crown portion is arranged at the bottom of the drill bit body; a conical drill bit is fixedly arranged on the bottom surface of the crown portion and located in the center of the crown portion; a plurality of nozzles which are distributed around the conical drill bit are arranged on the bottom surface of the crown portion, each nozzle being communicated with the fluid cavity; a plurality of main blade wings are fixedly arranged on the bottom surface of the crown portion along the circumferential direction of the drill bit body;
an auxiliary
2 blade wing is fixedly arranged between every two adjacent main blade wings; a plurality of PDC cutting teeth are fixedly arranged on each main blade wing along the length direction of the main blade wing; the bit cone is further fixedly arranged on each main blade wing; each bit cone comprises a conical body fixedly arranged on the top surface of the respective main blade wing, wherein a ring of inserted teeth, disk-shaped teeth and milling teeth are fixedly arranged in sequence on the outer surface of the conical body and between a small end surface and a large end surface;
the exposing height of each of the inserted teeth, the disk-shaped teeth and the milling teeth is greater than the exposing height of the PDC cutting teeth; the nozzle anti-blocking mechanism which is located in the respective fluid cavity is arranged above each nozzle; each nozzle anti-blocking mechanism comprises a hollow steel pipe, an unloading plate, a pushing plate, a spring and a plug, wherein the plug is fixedly arranged in each nozzle and is internally provided with a guiding hole; the hollow steel pipe which is movable vertically is slidably mounted in the guiding hole;
the upper end of each hollow steel pipe extends into the fluid cavity, and the pushing plate is welded to this extension end; the pushing plate is located in the fluid cavity;
the lower end of each hollow steel pipe extends into the nozzle, and the unloading plate is welded to the outside of this extension end; the unloading plate is located inside the nozzle; each hollow steel pipe is further sleeved with the spring;
one end of each spring is fixedly arranged on the bottom surface of the fluid cavity, and the other end of the spring is fixedly arranged on the bottom surface of the pushing plate.
Each auxiliary blade wing is fixedly arranged on the bottom surface of the crown portion and welded with the respective blade wing into a whole.
The main blade wings are uniformly distributed on the crown portion.
The crown portion is at least provided with three main blade wings.
Each unloading plate is parallel to the corresponding pushing plate.
Each hollow steel pipe is parallel to the axis of the drill bit body.
An internal thread is arranged inside each nozzle, an external thread is arranged outside each plug, and the external thread of the plug is connected to the internal
the exposing height of each of the inserted teeth, the disk-shaped teeth and the milling teeth is greater than the exposing height of the PDC cutting teeth; the nozzle anti-blocking mechanism which is located in the respective fluid cavity is arranged above each nozzle; each nozzle anti-blocking mechanism comprises a hollow steel pipe, an unloading plate, a pushing plate, a spring and a plug, wherein the plug is fixedly arranged in each nozzle and is internally provided with a guiding hole; the hollow steel pipe which is movable vertically is slidably mounted in the guiding hole;
the upper end of each hollow steel pipe extends into the fluid cavity, and the pushing plate is welded to this extension end; the pushing plate is located in the fluid cavity;
the lower end of each hollow steel pipe extends into the nozzle, and the unloading plate is welded to the outside of this extension end; the unloading plate is located inside the nozzle; each hollow steel pipe is further sleeved with the spring;
one end of each spring is fixedly arranged on the bottom surface of the fluid cavity, and the other end of the spring is fixedly arranged on the bottom surface of the pushing plate.
Each auxiliary blade wing is fixedly arranged on the bottom surface of the crown portion and welded with the respective blade wing into a whole.
The main blade wings are uniformly distributed on the crown portion.
The crown portion is at least provided with three main blade wings.
Each unloading plate is parallel to the corresponding pushing plate.
Each hollow steel pipe is parallel to the axis of the drill bit body.
An internal thread is arranged inside each nozzle, an external thread is arranged outside each plug, and the external thread of the plug is connected to the internal
3 thread and is fixed to the corresponding nozzle.
The bit cone has a triangular, semi-circular, trapezoidal or wedge-shaped section.
BENEFICAL EFFECTS OF THE INVENTION
BENEFICAL EFFECTS
The present invention has the advantages that the structure is compact, the rock breaking efficiency is improved, the service life of PDC cutting teeth is prolonged, nozzles can be prevented from being blocked by rocks or debris, and the manufacturing cost is low.
BRIEF DESCRIPTION OF THE DRAWINGS
FIG. 1 is a semisectional view of the present invention;
FIG. 2 is a bottom view of FIG. 1;
FIG. 3 is a sectional view of a bit cone;
FIG. 4 is a locally enlarged view of part tin FIG. 1;
in drawings, reference symbols represent the following components: 1-drill bit body; 2-bit cone; 3-fluid cavity; 4-crown portion; 5-conical drill bit; 6-nozzle; 7-main blade wing; 8-auxiliary blade wing; 9-PDC cutting teeth; 10-conical body; 11-inserted teeth; 12-disk-shaped teeth; 13-milling teeth; 14-hollow steel pipe; 15-unloading plate;
16-pushing plate; 17-spring; 18-plug; 19-guiding hole.
EMBODIMENTS OF THE INVENTION
DETAILED DESCRIPTION
The present invention will be further described below in conjunction with the accompanying drawings, and the protection scope of the present invention is not limited as follows:
As shown in FIGS. 1-4, a highly-efficient composite drill bit for a formation difficult to drill in a deep well comprises a drill bit body 1, bit cones 2 and nozzle anti-blocking mechanisms, wherein a fluid cavity 3 is formed inside the drill bit body
The bit cone has a triangular, semi-circular, trapezoidal or wedge-shaped section.
BENEFICAL EFFECTS OF THE INVENTION
BENEFICAL EFFECTS
The present invention has the advantages that the structure is compact, the rock breaking efficiency is improved, the service life of PDC cutting teeth is prolonged, nozzles can be prevented from being blocked by rocks or debris, and the manufacturing cost is low.
BRIEF DESCRIPTION OF THE DRAWINGS
FIG. 1 is a semisectional view of the present invention;
FIG. 2 is a bottom view of FIG. 1;
FIG. 3 is a sectional view of a bit cone;
FIG. 4 is a locally enlarged view of part tin FIG. 1;
in drawings, reference symbols represent the following components: 1-drill bit body; 2-bit cone; 3-fluid cavity; 4-crown portion; 5-conical drill bit; 6-nozzle; 7-main blade wing; 8-auxiliary blade wing; 9-PDC cutting teeth; 10-conical body; 11-inserted teeth; 12-disk-shaped teeth; 13-milling teeth; 14-hollow steel pipe; 15-unloading plate;
16-pushing plate; 17-spring; 18-plug; 19-guiding hole.
EMBODIMENTS OF THE INVENTION
DETAILED DESCRIPTION
The present invention will be further described below in conjunction with the accompanying drawings, and the protection scope of the present invention is not limited as follows:
As shown in FIGS. 1-4, a highly-efficient composite drill bit for a formation difficult to drill in a deep well comprises a drill bit body 1, bit cones 2 and nozzle anti-blocking mechanisms, wherein a fluid cavity 3 is formed inside the drill bit body
4 1; a crown portion 4 is arranged at the bottom of the drill bit body 1; a conical drill bit is fixedly arranged on the bottom surface of the crown portion 4 and located in the center of the crown portion 4; a plurality of nozzles 6 which are distributed around the conical drill bit 5 are arranged on the bottom surface of the crown portion 4, each nozzle 6 being communicated with the fluid cavity 3; a plurality of main blade wings 7 are fixedly arranged on the bottom surface of the crown portion 4 along the circumferential direction of the drill bit body 1. In this embodiment, the main blade wings 7 are uniformly distributed on the crown portion 4; the crown portion 4 is at least provided with three main blade wings 7; an auxiliary blade wing 8 is fixedly arranged between every two adjacent main blade wings 7; a plurality of PDC
cutting teeth 9 are fixedly arranged on each main blade wing 7 along the length direction of the main blade wing 7.
The bit cone 2 is further fixedly arranged on each main blade wing 7. In this embodiment. the bit cone 2 has a triangular, semi-circular, trapezoidal or wedge-shaped section. Each bit cone 2 comprises a conical body 10 fixedly arranged on the top surface of the respective main blade wing 7, wherein a ring of inserted teeth 11, disk-shaped teeth 12 and milling teeth 13 are fixedly arranged in sequence on the outer surface of the conical body 10 and between a small end surface and a large end surface; the exposing height of each of the inserted teeth 11, the disk-shaped teeth 12 and the milling teeth 13 is greater than the exposing height of the PDC
cutting teeth 9; the nozzle anti-blocking mechanism which is located in the respective fluid cavity 3 is arranged above each nozzle 6.
Each nozzle anti-blocking mechanism comprises a hollow steel pipe 14, an unloading plate IS, a pushing plate 16, a spring 17 and a plug 18, wherein the plug 18 is fixedly arranged in each nozzle 16 and is internally provided with a guiding hole 19;
the hollow steel pipe 14 which is movable vertically is slidably mounted in the guiding hole 9; each hollow steel pipe 14 is parallel to the axis of the drill bit body 1;
the upper end of each hollow steel pipe 14 extends into the fluid cavity 3, and the pushing plate 16 is welded to this extension end; the pushing plate 16 is located in the
cutting teeth 9 are fixedly arranged on each main blade wing 7 along the length direction of the main blade wing 7.
The bit cone 2 is further fixedly arranged on each main blade wing 7. In this embodiment. the bit cone 2 has a triangular, semi-circular, trapezoidal or wedge-shaped section. Each bit cone 2 comprises a conical body 10 fixedly arranged on the top surface of the respective main blade wing 7, wherein a ring of inserted teeth 11, disk-shaped teeth 12 and milling teeth 13 are fixedly arranged in sequence on the outer surface of the conical body 10 and between a small end surface and a large end surface; the exposing height of each of the inserted teeth 11, the disk-shaped teeth 12 and the milling teeth 13 is greater than the exposing height of the PDC
cutting teeth 9; the nozzle anti-blocking mechanism which is located in the respective fluid cavity 3 is arranged above each nozzle 6.
Each nozzle anti-blocking mechanism comprises a hollow steel pipe 14, an unloading plate IS, a pushing plate 16, a spring 17 and a plug 18, wherein the plug 18 is fixedly arranged in each nozzle 16 and is internally provided with a guiding hole 19;
the hollow steel pipe 14 which is movable vertically is slidably mounted in the guiding hole 9; each hollow steel pipe 14 is parallel to the axis of the drill bit body 1;
the upper end of each hollow steel pipe 14 extends into the fluid cavity 3, and the pushing plate 16 is welded to this extension end; the pushing plate 16 is located in the
5 fluid cavity 3; the lower end of each hollow steel pipe 14 extends into the nozzle 6, and the unloading plate 15 is welded to the outside of this extension end; the unloading plate 15 is parallel to the pushing plate 16 and located inside the nozzle 6;
each hollow steel pipe 14 is further sleeved with the spring 17; one end of each spring 17 is fixedly arranged on the bottom surface of the fluid cavity 3, and the other end of the spring 17 is fixedly arranged on the bottom surface of the pushing plate 16.
Each auxiliary blade wing 8 is fixedly arranged on the bottom surface of the crown portion 4 and welded with the respective blade wing 7 into a whole. An internal thread is arranged inside each nozzle 6, an external thread is arranged outside each plug 18. and the external thread of the plug 18 is connected to the internal thread and is fixed to the corresponding nozzle 6.
The working process of the present invention is as follows:
before working, a conical threaded end at the upper end of the drill bit body 1 is connected to an internal thread of the drill pipe to install the entire PD C
speed-up drill bit; during working, the drill pipe is lowered and rotates at a high speed; the drill pipe drives the PDC speed-up drill bit to rotate at a high speed; the PDC
speed-up drill bit enters the hard formation, such that the conical drill bit 5 primarily breaks the large rock; the broken rock is further broken by the milling teeth 13, the disk-shaped teeth 12 and the inserted teeth 11 and finally broken by the PDC cutting teeth 9 to obtain debris finally. Therefore, the PDC cutting teeth 9 do not directly break the hard large-size rock, such that the PDC cutting teeth are protected well, thereby ensuring that the PDC cutting teeth can work for a long time and improve the rock breaking efficiency.
During the drilling process, a worker operates a high pressure pump on the ground and pumps a high pressure fluid into the fluid chamber 3 through the high pressure pump, wherein a part of the high pressure fluid hits the top surface of the pushing plate 16, and the remaining part of the high pressure fluid directly passes through the inner cavity of the hollow steel pipe 14 and the nozzle 6 to finally act on the bottom of the well. The fluid reduces the temperature of the PDC cutting teeth to
each hollow steel pipe 14 is further sleeved with the spring 17; one end of each spring 17 is fixedly arranged on the bottom surface of the fluid cavity 3, and the other end of the spring 17 is fixedly arranged on the bottom surface of the pushing plate 16.
Each auxiliary blade wing 8 is fixedly arranged on the bottom surface of the crown portion 4 and welded with the respective blade wing 7 into a whole. An internal thread is arranged inside each nozzle 6, an external thread is arranged outside each plug 18. and the external thread of the plug 18 is connected to the internal thread and is fixed to the corresponding nozzle 6.
The working process of the present invention is as follows:
before working, a conical threaded end at the upper end of the drill bit body 1 is connected to an internal thread of the drill pipe to install the entire PD C
speed-up drill bit; during working, the drill pipe is lowered and rotates at a high speed; the drill pipe drives the PDC speed-up drill bit to rotate at a high speed; the PDC
speed-up drill bit enters the hard formation, such that the conical drill bit 5 primarily breaks the large rock; the broken rock is further broken by the milling teeth 13, the disk-shaped teeth 12 and the inserted teeth 11 and finally broken by the PDC cutting teeth 9 to obtain debris finally. Therefore, the PDC cutting teeth 9 do not directly break the hard large-size rock, such that the PDC cutting teeth are protected well, thereby ensuring that the PDC cutting teeth can work for a long time and improve the rock breaking efficiency.
During the drilling process, a worker operates a high pressure pump on the ground and pumps a high pressure fluid into the fluid chamber 3 through the high pressure pump, wherein a part of the high pressure fluid hits the top surface of the pushing plate 16, and the remaining part of the high pressure fluid directly passes through the inner cavity of the hollow steel pipe 14 and the nozzle 6 to finally act on the bottom of the well. The fluid reduces the temperature of the PDC cutting teeth to
6 ensure proper operations of the PDC cutting teeth. If the debris generated during the drilling blocks the nozzle 6, the high pressure fluid hitting the top surface of the pushing plate 16 applies a downward acting force to the pushing plate 16, to drive the hollow steel pipe 14 to move downwards along the guiding hole 19. Meanwhile, the spring 17 is compressed to further drive the unloading plate 15 to move downwards.
The debris stuck in the nozzle 6 is discharged by the unloading plate 15 downwards to the outside of the nozzle 6, and a lower port of the nozzle 6 is plugged to prevent the debris from entering therein, such that the nozzle is effectively prevented from being blocked, thereby ensuring that the PDC cutting teeth can be continuously cooled, and further ensuring the smooth proceeding of rock breaking.
The debris stuck in the nozzle 6 is discharged by the unloading plate 15 downwards to the outside of the nozzle 6, and a lower port of the nozzle 6 is plugged to prevent the debris from entering therein, such that the nozzle is effectively prevented from being blocked, thereby ensuring that the PDC cutting teeth can be continuously cooled, and further ensuring the smooth proceeding of rock breaking.
7
Claims (8)
1. A highly-efficient composite drill bit for a formation difficult to drill in a deep well, comprising a drill bit body, bit cones and nozzle anti-blocking mechanisms, wherein a fluid cavity is formed inside the drill bit body; a crown portion is arranged at the bottom of the drill bit body; a conical drill bit is fixedly arranged on the bottom surface of the crown portion and located in the center of the crown portion; a plurality of nozzles which are distributed around the conical drill bit are arranged on the bottom surface of the crown portion, each nozzle being communicated with the fluid cavity; a plurality of main blade wings are fixedly arranged on the bottom surface of the crown portion along the circumferential direction of the drill bit body; an auxiliary blade wing is fixedly arranged between every two adjacent main blade wings; a plurality of PDC cutting teeth are fixedly arranged on each main blade wing along the length direction of the main blade wing; the bit cone is further fixedly arranged on each main blade wing; each bit cone comprises a conical body fixedly arranged on the top surface of the respective main blade wing, wherein a ring of inserted teeth, disk-shaped teeth and milling teeth are fixedly arranged in sequence on the outer surface of the conical body and between a small end surface and a large end surface; the exposing height of each of the inserted teeth, the disk-shaped teeth and the milling teeth is greater than the exposing height of the PDC cutting teeth;
the nozzle anti-blocking mechanism which is located in the respective fluid cavity is arranged above each nozzle; each nozzle anti-blocking mechanism comprises a hollow steel pipe, an unloading plate, a pushing plate, a spring and a plug, wherein the plug is fixedly arranged in each nozzle and is internally provided with a guiding hole; the hollow steel pipe which is movable vertically is slidably mounted in the guiding hole; the upper end of the hollow steel pipe extends into the fluid cavity, and the pushing plate is welded to this extension end; the pushing plate is located in the fluid cavity; the lower end of the hollow steel pipe extends into the nozzle, and the unloading plate is welded to the outside of this extension end; the unloading plate is located inside the nozzle; the hollow steel pipe is further sleeved with the spring; one end of each spring is fixedly arranged on the bottom surface of the fluid cavity, and the other end of the spring is fixedly arranged on the bottom surface of the pushing plate.
the nozzle anti-blocking mechanism which is located in the respective fluid cavity is arranged above each nozzle; each nozzle anti-blocking mechanism comprises a hollow steel pipe, an unloading plate, a pushing plate, a spring and a plug, wherein the plug is fixedly arranged in each nozzle and is internally provided with a guiding hole; the hollow steel pipe which is movable vertically is slidably mounted in the guiding hole; the upper end of the hollow steel pipe extends into the fluid cavity, and the pushing plate is welded to this extension end; the pushing plate is located in the fluid cavity; the lower end of the hollow steel pipe extends into the nozzle, and the unloading plate is welded to the outside of this extension end; the unloading plate is located inside the nozzle; the hollow steel pipe is further sleeved with the spring; one end of each spring is fixedly arranged on the bottom surface of the fluid cavity, and the other end of the spring is fixedly arranged on the bottom surface of the pushing plate.
2. The highly-efficient composite drill bit of claim 1, wherein each auxiliary blade Date Recue/Date Received 2020-12-14 wing is fixedly arranged on the bottom surface of the crown portion and welded with the respective main blade wing into a hole.
3. The highly-efficient composite drill bit of claim 1 or claim 2, wherein the main blade wings are uniformly distributed on the crown portion.
4. The highly-efficient composite drill bit of any one of claims 1-3, wherein the crown portion is at least provided with three main blade wings.
5. The highly-efficient composite drill bit of any one of claims 1-4, wherein the unloading plate is parallel to the pushing plate.
6. The highly-efficient composite drill bit of any one of claims 1-5, wherein the hollow steel pipe is parallel to an axis of the drill bit body.
7. The highly-efficient composite drill bit of any one of claims 1-6, wherein an internal thread is arranged inside the nozzle, an external thread is arranged outside the plug, and the external thread of the plug is connected to the internal thread and is fixed to the nozzle.
8. The highly-efficient composite drill bit of any one of claims 1-7, wherein the bit cone has a triangular, semi-circular, trapezoidal or wedge-shaped section.
Date Recue/Date Received 2020-12-14
Date Recue/Date Received 2020-12-14
Applications Claiming Priority (3)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201811126683.XA CN109057715A (en) | 2018-09-26 | 2018-09-26 | A kind of compound PDC speed-raising drill bit cutting hardpan |
| CN201811126683.X | 2018-09-26 | ||
| PCT/CN2019/072903 WO2020062741A1 (en) | 2018-09-26 | 2019-01-24 | Efficient composite drill bit suitable for deep well stratum difficult to drill |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CA3050791A1 CA3050791A1 (en) | 2020-03-26 |
| CA3050791C true CA3050791C (en) | 2021-04-20 |
Family
ID=69948330
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CA3050791A Active CA3050791C (en) | 2018-09-26 | 2019-01-24 | Highly-efficient composite drill bit for formation difficult to drill in deep well |
Country Status (1)
| Country | Link |
|---|---|
| CA (1) | CA3050791C (en) |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN116658083B (en) * | 2023-08-01 | 2023-10-03 | 陕西星通石油工程技术有限公司 | PDC drill bit water hole anti-blocking module |
-
2019
- 2019-01-24 CA CA3050791A patent/CA3050791C/en active Active
Also Published As
| Publication number | Publication date |
|---|---|
| CA3050791A1 (en) | 2020-03-26 |
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