CN117345115B - Drill bit with strong track control capability and high drilling efficiency under action of pushing force - Google Patents
Drill bit with strong track control capability and high drilling efficiency under action of pushing force Download PDFInfo
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- CN117345115B CN117345115B CN202311639862.4A CN202311639862A CN117345115B CN 117345115 B CN117345115 B CN 117345115B CN 202311639862 A CN202311639862 A CN 202311639862A CN 117345115 B CN117345115 B CN 117345115B
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- drill bit
- gage
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- bit body
- cutting
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- 238000005553 drilling Methods 0.000 title claims abstract description 64
- 238000005520 cutting process Methods 0.000 claims abstract description 69
- 239000011435 rock Substances 0.000 claims abstract description 68
- 230000036346 tooth eruption Effects 0.000 claims abstract description 36
- 239000012530 fluid Substances 0.000 claims abstract description 8
- 238000006243 chemical reaction Methods 0.000 claims description 4
- 238000000034 method Methods 0.000 abstract description 9
- 239000010410 layer Substances 0.000 description 9
- 238000005516 engineering process Methods 0.000 description 4
- 230000002035 prolonged effect Effects 0.000 description 4
- 230000000694 effects Effects 0.000 description 3
- 239000002356 single layer Substances 0.000 description 3
- 230000009286 beneficial effect Effects 0.000 description 2
- 230000018109 developmental process Effects 0.000 description 2
- LTUFGCFAPCJOFQ-UHFFFAOYSA-N 2h-pyran-3-carboxamide Chemical compound NC(=O)C1=CC=COC1 LTUFGCFAPCJOFQ-UHFFFAOYSA-N 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000009826 distribution Methods 0.000 description 1
- 230000002708 enhancing effect Effects 0.000 description 1
- 238000005728 strengthening Methods 0.000 description 1
- 238000009966 trimming Methods 0.000 description 1
- 238000003466 welding Methods 0.000 description 1
Classifications
-
- E—FIXED CONSTRUCTIONS
- E21—EARTH OR ROCK DRILLING; MINING
- E21B—EARTH OR ROCK DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
- E21B10/00—Drill bits
- E21B10/42—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
- E21B10/602—Drill bits characterised by conduits or nozzles for drilling fluids the bit being a rotary drag type bit with blades
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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 drill bit with strong track control capability and high drilling efficiency under the action of pushing force, belonging to the technical field of drilling engineering, comprising an adapter and a drill bit body; the drill bit body is provided with a plurality of rock breaking blades along the circumferential direction, the radial outer end face of each rock breaking blade comprises a first conical surface, a gauge upper conical part, a gauge surface and an outer annular cambered surface which are sequentially connected, the edge of the outer annular cambered surface inwards and inwards in a stepped manner to form a stepped connection surface, and the inner end of the stepped connection surface is connected with the inner annular part; a plurality of cutting teeth are arranged on the gage upper cone part, the gage surface, the outer arc surface and the inner ring part; the middle part of the adapter is provided with a drilling fluid flow passage; the drill bit body is internally provided with a drill bit inner cavity; the drill bit body is provided with a drill bit nozzle which is communicated with the inner cavity of the drill bit. According to the invention, through the structural arrangement of the outer end surface of the rock breaking blade, the arrangement of the convex blade wall surface of the cutting tooth and the multi-blade arrangement, the strong track control capability and the high drilling efficiency can be maintained in the drilling process.
Description
Technical Field
The invention belongs to the technical field of drilling engineering, in particular to the technical field of push-back type rotary guide drilling technology and push-back type automatic vertical drilling, and particularly relates to a drill bit with high track control capability and high drilling efficiency under the action of push-back force.
Background
The well drilling is the only way for constructing deep underground geological resource exploration and development channels, high-quality high-efficiency well drilling is an urgent need for deep, ultra-deep and ultra-deep geological resource exploration and development, the track control is precise, the rock breaking speed is high, the well drilling process is not interrupted, the foundation of the high-quality high-efficiency well drilling is ensured, the track control is difficult, the rock breaking speed is low, the deep, ultra-deep and ultra-deep well drilling period is long due to frequent tripping, and the high cost is the current difficult problem to be solved urgently. In order to break through the problems, a push-type automatic vertical drilling system and a push-type rotary guiding drilling system are developed in the field of well drilling, the push-type automatic vertical drilling system is utilized to prevent inclined drilling and straightening of a straight well section of a vertical well and a directional well, the push-type rotary guiding drilling system is utilized to intelligently control a track of a directional well section of the directional well, and the track control precision, the drilling rock breaking speed and the drilling process continuity are synchronously improved by the application of the two sets of equipment.
However, the use of the drilling system described above has the following problems:
(1) Both drilling systems change the track by applying lateral thrust to the drill bit, however, the direction of the drill bit is also changed in the process of applying the thrust to the drill bit, and the direction of the drill bit is opposite to the direction of the thrust to which the drill bit is subjected, so that the track control of the drill bit is difficult; (2) When the two drilling systems are applied, the drilling speed can not be effectively improved because the adopted drill bit is a conventional drill bit, and the reinforced drilling pressure can cause large rock breaking vibration and short service life of the drill bit; (3) The cutting teeth on the drill bit adopted by the two drilling systems at present are worn, so that the rock breaking capacity is greatly reduced, and the drill bit is easy to fail and difficult to continuously drill.
Based on the problems, the application provides the drill bit with strong track control capability and high drilling efficiency under the action of pushing force.
Disclosure of Invention
The invention aims to overcome the defects of the prior art and provide the drill bit with high track control capability and high drilling efficiency under the action of pushing force.
In order to achieve the above purpose, the invention adopts the following technical scheme:
a drill bit with strong track control capability and high drilling efficiency under the action of pushing force comprises a conversion joint and a drill bit body which are fixedly connected;
the drill bit body is uniformly provided with a plurality of rock breaking blades along the circumferential direction, the radial outer end face of the rock breaking blades comprises a first conical surface, a gage upper conical part, a gage surface and an outer arc surface which are sequentially connected from the side wall of the drill bit body to the head end direction, the edge of the outer arc surface is inwards concave in a step manner to form a step-shaped connecting surface, and the inner end of the step-shaped connecting surface is connected with an inner ring part extending to the center direction of the drill bit body;
the gage surfaces are in cylindrical structures, gage surfaces of all rock breaking blades are located on the same cylindrical surface, and the central axis of the cylindrical surface is consistent with the central axis of the drill bit body;
the gage upper cone part, the gage surface, the outer ring cambered surface and the inner ring part are provided with a plurality of cutting teeth which are distributed along the bus direction;
the middle part of the adapter is provided with a through drilling fluid flow passage along the axial direction;
a drill bit inner cavity communicated with the drilling fluid channel is arranged in the drill bit body;
the drill bit body is provided with a drill bit nozzle which is communicated with the inner cavity of the drill bit.
Preferably, the gauge upper cone part comprises a gauge upper cone surface with a round table surface structure or a plurality of gauge upper cone surfaces with round table surface structures which are connected in sequence;
between adjacent conical surfaces on the gage, the big end of one conical surface on the gage is connected with the small end of the other conical surface on the gage.
Preferably, the inner ring part comprises an inner conical surface with a conical surface structure, and the central axis of the conical surface where the inner conical surface is positioned is collinear with the central axis of the drill bit body.
Preferably, a plurality of connection surfaces with a truncated cone surface structure are arranged between the inner conical surface and the stepped connection surface;
the big end of the inner conical surface is connected with the small end of the adjacent connecting surface;
between adjacent connecting surfaces, the big end of one connecting surface is connected with the small end of the other connecting surface;
the end part of the step-type connecting surface is connected with the big end part of the adjacent connecting surface.
Preferably, the stepped connecting surface is in a cylindrical surface structure;
the stepped connection surfaces of all the rock breaking blades are positioned on the same axial cylindrical surface, and the central axis of the axial cylindrical surface is collinear with the central axis of the drill bit body.
Preferably, the cutting teeth are PDC teeth, the end parts of the tooth bodies of the cutting teeth are cylinders, the rock breaking ends of the cutting teeth comprise a plurality of layers of cutting tooth surfaces which are distributed in a step shape, and the cutting tooth surfaces of all the layers are parallel.
Preferably, the height of the outer end face of the rock breaking blade where the cutting teeth protrude is 0.2 mm-6 mm.
Preferably, the back inclination angle of the cutting teeth on the rock breaking blade is gradually reduced along the direction of the generatrix according to the sequence of the inner ring part, the outer ring cambered surface, the gage surface and the gage upper cone part.
Preferably, the number of the cutting teeth on the gage surface is n, and n is more than or equal to 2 and less than or equal to 10.
Preferably, the drill bit nozzle comprises an inner edge nozzle arranged on the drill bit body between the rock breaking blades and an outer edge nozzle arranged on the rock breaking blades;
the inner edge nozzle is communicated with the inner cavity of the drill bit through an inner edge runner, and the outer edge nozzle is communicated with the inner cavity of the drill bit through an outer edge runner.
The beneficial effects of the invention are as follows:
(1) The invention can maintain stronger track control capability in the drilling process through the structural arrangement of the outer end surface of the rock breaking blade, the arrangement of the convex blade wall surface of the cutting teeth and the multi-blade arrangement.
(2) The arrangement of the concave stepped connecting surface and the arrangement of the cutting teeth on the inner ring part form a concave cylindrical area in the concave area of the head end of the drill bit body, and a rock column is formed in the concave cylindrical area in the process of drilling into a stratum; when the stratum is drilled, firstly, cutting teeth on the outer arc surface crush bottom hole rocks, a rock column formed in the center part effectively releases bottom hole stress, and a stress unloading area is formed in the rock column part, so that the occurrence of a centering condition can be effectively prevented; the cutting teeth on the inner ring part crush the middle rock column, and compared with a conventional drill bit without a concave area, the drill bit structure of the invention greatly reduces the crushing difficulty of the rock at the central part, thereby improving the drilling speed.
(3) Compared with the existing cutting tooth with a single-layer cutting tooth surface, the multi-layer cutting tooth surface of the cutting tooth has the advantages that the service life of the tooth is prolonged, and the service life of a drill bit is prolonged.
Drawings
The accompanying drawings, which are included to provide a further understanding of the application and are incorporated in and constitute a part of this application, illustrate embodiments of the application and together with the description serve to explain the application and do not constitute an undue limitation to the application.
FIG. 1 is a schematic diagram of a drill bit with high trajectory control and high drilling efficiency under the action of pushing force according to the present invention;
FIG. 2 is a cross-sectional view of a rock breaking blade of the present invention having an upper gage cone with an upper gage cone and an inner ring with an inner cone and an inner concave cone;
FIG. 3 is a cross-sectional view of a rock breaking blade having two gage upper conical surfaces on the gage upper conical portion, two connecting surfaces on the inner ring portion, and an inner conical surface being a concave conical surface in the present invention;
FIG. 4 is a cross-sectional view of a rock breaking blade having two gage upper cones in the gage upper cone portion, an inner cone surface in the inner ring portion, and an outer cone surface in the inner cone portion;
FIG. 5 is a cross-sectional view of a rock breaking blade having two gage upper cones in the gage upper cone portion, two connecting surfaces in the inner ring portion, and an outer convex cone in the inner cone portion;
FIG. 6 is a cross-sectional view of a rock breaking blade of the present invention having two gage upper cones with gage surfaces in contact with the small tips of the gage upper cones;
FIG. 7 is a schematic view of the geometry of a bit body of the present invention;
FIG. 8 is a schematic view of a cutting tooth structure in the present invention in which the cutting tooth surface is planar;
FIG. 9 is a schematic view of a cutting tooth structure in the present invention in which the cutting tooth surface is a conical surface;
FIG. 10 is a schematic view showing the structure of a cutting tooth in the case where the cutting tooth surface is a pyramid surface in the present invention;
wherein:
1-adapter, 101-drilling fluid flow channel;
2-bit body, 201-bit inner cavity;
3-rock breaking blades, 301-a first conical surface, 302-a gage upper conical surface, 303-a gage surface, 304-an outer annular cambered surface, 305-an inner conical surface, 306-a stepped connecting surface and 307-a connecting surface;
4-cutting teeth, 401-circular plane, 402-annular plane, 403-conical surface, 404-annular conical surface, 405-conical pyramid, 406-annular conical pyramid;
5-inner edge nozzle;
6-an outer edge nozzle;
7-inner edge flow channels;
8-an outer edge runner.
Detailed Description
It should be noted that the following detailed description is illustrative and is intended to provide further explanation of the present application. Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs.
It is noted that the terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of example embodiments in accordance with the present application. As used herein, the singular is also intended to include the plural unless the context clearly indicates otherwise, and furthermore, it is to be understood that the terms "comprises" and/or "comprising" when used in this specification are taken to specify the presence of stated features, steps, operations, devices, components, and/or combinations thereof.
In the present invention, terms such as "connected," "connected," and the like are to be construed broadly and mean either fixedly connected or integrally connected or detachably connected; can be directly connected or indirectly connected through an intermediate medium. The specific meaning of the terms in the present invention can be determined according to circumstances by a person skilled in the relevant art or the art, and is not to be construed as limiting the present invention.
The invention will be further described with reference to the drawings and examples.
As shown in fig. 1, a drill bit with high track control capability and high drilling efficiency under the action of pushing force comprises a conversion joint 1 and a drill bit body 2 which are fixedly connected, wherein the conversion joint 1 is connected with the drill bit body 2 by welding;
the drill bit body 2 is uniformly provided with a plurality of rock breaking blades 3 along the circumferential direction, the radial outer end surface of the rock breaking blades 3 comprises a first conical surface 301, a gauge upper conical part, a gauge surface 303 and an outer annular cambered surface 304 which are sequentially connected from the side wall of the drill bit body 2 to the head end direction, the edge of the outer annular cambered surface 304 is inwards concave in a step-like manner to form a step-like connection surface 306, and the inner end of the step-like connection surface 306 is connected with an inner annular part extending to the center direction of the drill bit body 2;
the gage surfaces 303 are in cylindrical structures, the gage surfaces 303 of all the rock breaking blades 3 are positioned on the same cylindrical surface, and the central axis of the cylindrical surface is consistent with the central axis of the drill bit body 2;
the gage upper cone part, the gage surface 303, the outer ring cambered surface 304 and the inner ring part are provided with a plurality of cutting teeth 4 which are distributed along the bus direction; wherein the cutting teeth 4 are protruded out of the outer end surface of the rock breaking blade 3;
the middle part of the adapter 1 is provided with a through drilling fluid flow passage 101 along the axial direction;
a drill bit inner cavity 201 communicated with the drilling fluid flow channel 101 is arranged in the drill bit body 2;
the drill bit body 2 is provided with a drill bit nozzle which is communicated with the drill bit inner cavity 201.
Preferably, the gauge upper cone part comprises a gauge upper cone surface 302 with a round table surface structure or a plurality of gauge upper cone surfaces 302 with round table surface structures which are connected in sequence;
between adjacent gage-cone surfaces 302, the large end of one gage-cone surface 302 is connected with the small end of the other gage-cone surface 302.
Wherein, gauge face 303 may meet the large end of adjacent gauge cone 302, as shown in fig. 2-5; gage surface 303 may also meet the small tip of adjacent gage upper cone 302 as shown in fig. 6; wherein the rock breaking blade 3 shown in fig. 2 has one gage upper cone 302 therein, and the rock breaking blade 3 shown in fig. 3-6 has two gage upper cones 302 therein.
Specifically, the included angle between the generatrix of the conical surface 302 on the gage and the generatrix of the gage surface 303 is in the range of 0-10 degrees, so as to ensure that the drill bit has stronger lateral cutting capability in different states.
Preferably, the inner ring portion includes an inner conical surface 305 with a conical surface structure, and a central axis of the conical surface where the inner conical surface 305 is located is collinear with a central axis of the drill bit body 2.
The vertex of the conical surface where the inner conical surface 305 is located may extend toward the inside of the drill bit body 2, so that the inner conical surface 305 forms a concave conical surface, as shown in fig. 2;
the apex of the conical surface where the inner conical surface 305 is located may also extend to the outside of the bit body 2, so that the inner conical surface 305 forms an outer conical surface, as shown in fig. 4.
Specifically, the cone angle of the conical surface where the inner conical surface 305 is located is 90 ° to 135 °.
Preferably, a plurality of connection surfaces 307 with a truncated cone structure are arranged between the inner conical surface 305 and the stepped connection surface 306;
the big end of the inner conical surface 305 is connected with the small end of the adjacent connecting surface 307;
between adjacent connection faces 307, the big end of one connection face 307 is connected with the small end of the other connection face 307;
the end of the stepped connection face 306 meets the large end of the adjacent connection face 307.
When the inner conical surface 305 is a concave conical surface, the structure between the inner conical surface 305 and the step-shaped connecting surface 306 is shown in fig. 3; when the inner tapered surface 305 is an outer tapered surface, the structure between the inner tapered surface 305 and the stepped connecting surface 306 is as shown in fig. 5.
Preferably, the stepped connecting surface 306 has a cylindrical structure;
the stepped connection surfaces 306 of all the rock-breaking blades 3 are located on the same axial cylindrical surface, the central axis of which is collinear with the central axis of the bit body 2.
Specifically, as shown in fig. 7, the height h of the head end of the drill body 2 and the inner end of the stepped connection surface 306 in the axial direction of the drill body 2 is 0.1D-D;
the diameter D of the axial cylindrical surface is 0.1D-0.8D, D is the diameter of a drill bit, and the diameter of the drill bit is the diameter of the cylindrical surface where the gage surface 303 is located.
At this size, the bit has a lower rock breaking power, and less mechanical energy is consumed to break the rock per unit volume, which is beneficial to the extension of the bit life.
Preferably, the cutting teeth 4 are PDC teeth, the end part of the tooth body of the cutting teeth 4 is a cylinder, the rock breaking end of the cutting teeth 4 comprises a plurality of layers of cutting tooth surfaces distributed in a step shape, and the cutting tooth surfaces of all layers are parallel. Specifically, the cutting tooth 4 of the present application does not undergo a trimming process when mounted on a drill bit.
When the cutting tool is used, the cutting tooth surface at the most end of the center firstly contacts with rock to play a cutting role; when the rock is too hard or used for a period of time, the cutting tooth surface at the central part is damaged and loses the cutting action, and the next layer of cutting tooth surface can play the cutting action. Compared with the existing cutting tooth with a single-layer cutting tooth surface, the cutting tooth has the advantages that the service life of the tooth is prolonged due to the arrangement of the cutting tooth.
The cutting tooth surface is a plane surface, a conical surface or a pyramid surface, and can be in other shapes.
Specifically, as shown in fig. 8, the cutting tooth surface is a plane, the cutting tooth surface at the head end at the center is a circular plane 401, and the remaining cutting tooth surfaces distributed stepwise are annular planes 402.
Specifically, as shown in fig. 9, the cutting tooth surface is a conical surface, the cutting tooth surface at the head end in the center includes two intersecting conical surfaces 403, and the remaining cutting tooth surfaces in stepwise distribution are annular conical surfaces 404.
Specifically, as shown in fig. 10, the cutting tooth surface is a pyramid surface, the cutting tooth surface at the end of the center includes a plurality of pyramid surfaces 405 intersecting at a point, the rest of the cutting tooth surfaces distributed in a stepwise manner are annular pyramid surfaces 406, the extension surfaces of the same layer of annular pyramid surfaces 406 also intersect at a point, and the points at which the pyramid surfaces 405 intersect and the points at which the annular pyramid surfaces 406 intersect are located on the central axis of the cutting tooth 4. The configuration of the cutting tooth surface at the center most end, including 3 pyramid surfaces 405, is shown in fig. 10, and other numbers of pyramid surfaces may be included, which are not shown here.
Specifically, the height difference of adjacent cutting tooth surfaces along the axial direction of the end part of the tooth body is 0.01mm-3mm; the width of the ring surface of the cutting tooth surface with the ring-shaped structure along the radial direction of the end part of the tooth body is 0.01mm-3mm.
Preferably, the height of the outer end surface of the rock breaking blade 3 where the cutting teeth 4 protrude is 0.2 mm-6 mm, and lateral cutting allowance is provided for the drill bit so as to improve the lateral cutting capability of the drill bit.
Preferably, the back inclination angle of the cutting teeth 4 on the rock breaking blade 3 is gradually reduced along the direction of the generatrix in the sequence of the inner ring part, the outer ring cambered surface 304, the gauge protection surface 303 and the gauge protection upper cone part; the reasonable regulation and control of the lateral cutting capacity and the axial cutting capacity of the drill bit are realized through the change of the back inclination angle, so that the deflecting capacity of the drill bit when the drill bit is matched with a pushing rotary steering drilling tool is improved, and the requirement of quick drilling is met.
Specifically, the back rake angle of the cutting teeth 4 on the inner ring portion is not more than 30 °, the back rake angle of the cutting teeth 4 on the gage surface 303 is not less than 6 °, and the back rake angle of the cutting teeth 4 on the gage upper cone portion is not less than 5 °. The back inclination angle of the cutting tooth refers to an included angle between the working surface of the cutting tooth and the external normal of the well bottom rock surface.
Preferably, the number of the cutting teeth 4 on the gage surface 303 is n, n is more than or equal to 2 and less than or equal to 10, and the gage surface 303 in the application is a short gage for enhancing the lateral cutting effect of the drill bit under the same pushing force.
Preferably, the drill bit nozzles comprise inner edge nozzles 5 arranged on the drill bit body 2 between the rock breaking blades 3, and outer edge nozzles 6 arranged on the rock breaking blades 3;
the inner edge nozzle 5 is communicated with the inner cavity 201 of the drill bit through an inner edge flow channel 7, and the outer edge nozzle 6 is communicated with the inner cavity of the drill bit through an outer edge flow channel 8.
The inner edge nozzle 5 can clean the cutting teeth 4 on the inner ring part, the outer edge nozzle 6 is opposite to the adjacent rock breaking blade 3 and the cutting teeth 4 on the adjacent rock breaking blade, and the inner edge nozzle 5 and the outer edge nozzle 6 act together.
According to the invention, through the structural arrangement of the outer end surface of the rock breaking blade 3, the arrangement of the convex blade wall surface of the cutting tooth 4 and the multi-blade arrangement, the short gage setting of the gage surface 303 on the outer end surface of the rock breaking blade 3 is used for strengthening the lateral cutting effect of the drill bit under the same pushing force in the drilling process, the arrangement of the conical surface 302 on the gage is used for ensuring the lateral cutting capability of the drill bit in different states with the well bore, the convex blade wall surface of the cutting tooth 4 is used for ensuring the lateral cutting capability of the drill bit, the multi-blade arrangement ensures the continuous rock breaking capability of the cutting tooth, and the comprehensive arrangement can keep stronger track control capability.
The arrangement of the concave stepped connecting surface 306 and the arrangement of the cutting teeth 4 on the inner ring part form a concave cylindrical area in the concave area of the head end of the drill bit body 2, and a rock column is formed in the concave cylindrical area in the process of drilling into a stratum; when the stratum is drilled, firstly, cutting teeth 4 on the outer arc surface 304 crush bottom hole rocks, a rock column formed in the center part effectively releases bottom hole stress, and a stress unloading area is formed in the rock column part, so that the occurrence of a centering situation can be effectively prevented; the cutting teeth 4 on the inner ring part crush the middle rock column, and compared with a conventional drill bit without a concave area, the drill bit structure of the invention greatly reduces the crushing difficulty of the rock at the central part, thereby improving the drilling speed.
In the invention, the multi-layer cutting tooth surface of the cutting tooth 4 is arranged, and when in use, the cutting tooth surface at the most end of the center firstly contacts rock to play a cutting role; when the rock is too hard or used for a period of time, the cutting tooth surface at the central part is damaged and loses the cutting action, and the next layer of cutting tooth surface can play the cutting action. Compared with the existing cutting tooth with a single-layer cutting tooth surface, the cutting tooth 4 has the advantage that the service life of the tooth is prolonged. The drill bit provided by the invention improves the drilling efficiency on the basis of improving the drilling speed and prolonging the service life.
In addition, the drill bit can be suitable for a push-type rotary steering drilling technology and a push-type vertical drilling technology, and in the push-type vertical drilling technology, the anti-oblique-drilling effect of the drill bit can be enhanced, and the loss of a push-type vertical drilling tool can be reduced; meanwhile, the drill bit can meet the requirements of directional drilling of various stratum.
While the foregoing is directed to embodiments of the present invention, other and further embodiments of the invention may be devised without departing from the basic scope thereof, and the scope thereof is determined by the claims that follow.
Claims (7)
1. The drill bit with high track control capability and high drilling efficiency under the action of pushing force is characterized by comprising a conversion joint and a drill bit body which are fixedly connected;
the drill bit body is uniformly provided with a plurality of rock breaking blades along the circumferential direction, the radial outer end face of the rock breaking blades comprises a first conical surface, a gage upper conical part, a gage surface and an outer arc surface which are sequentially connected from the side wall of the drill bit body to the head end direction, the edge of the outer arc surface is inwards concave in a step manner to form a step-shaped connecting surface, and the inner end of the step-shaped connecting surface is connected with an inner ring part extending to the center direction of the drill bit body;
the gage surfaces are in cylindrical structures, gage surfaces of all rock breaking blades are located on the same cylindrical surface, and the central axis of the cylindrical surface is consistent with the central axis of the drill bit body;
the gage upper cone part, the gage surface, the outer ring cambered surface and the inner ring part are provided with a plurality of cutting teeth which are distributed along the bus direction;
the middle part of the adapter is provided with a through drilling fluid flow passage along the axial direction;
a drill bit inner cavity communicated with the drilling fluid channel is arranged in the drill bit body;
the drill bit body is provided with a drill bit nozzle which is communicated with the inner cavity of the drill bit;
the gauge upper cone part comprises a plurality of gauge upper cone surfaces which are sequentially connected and have a round table surface structure;
between adjacent gauge cone surfaces, the big end of one gauge cone is connected with the small end of the other gauge cone;
the inner ring part comprises an inner conical surface with a conical surface structure, and the central axis of the conical surface where the inner conical surface is positioned is collinear with the central axis of the drill bit body;
a plurality of connection surfaces with a truncated cone surface structure are arranged between the inner conical surface and the stepped connection surface;
the big end of the inner conical surface is connected with the small end of the adjacent connecting surface;
between adjacent connecting surfaces, the big end of one connecting surface is connected with the small end of the other connecting surface;
the end part of the step-type connecting surface is connected with the big end part of the adjacent connecting surface.
2. The drill bit with high trajectory control capability and high drilling efficiency under pushing force as claimed in claim 1, wherein said stepped junction is cylindrical;
the stepped connection surfaces of all the rock breaking blades are positioned on the same axial cylindrical surface, and the central axis of the axial cylindrical surface is collinear with the central axis of the drill bit body.
3. The drill bit with high trajectory control capability and high drilling efficiency under the action of pushing force as claimed in claim 1, wherein the cutting teeth are PDC teeth, the end parts of the tooth bodies of the cutting teeth are cylindrical, the rock breaking end of the cutting teeth comprises a plurality of layers of cutting tooth surfaces distributed in a step shape, and the cutting tooth surfaces of the layers are parallel.
4. The drill bit with high trajectory control capability and high drilling efficiency under the action of pushing force as claimed in claim 1, wherein the height of the outer end face of the rock breaking blade where the cutting teeth protrude is 0.2mm to 6mm.
5. The drill bit with high trajectory control capability and high drilling efficiency under the action of pushing force according to claim 1, wherein the back inclination angle of the cutting teeth on the rock breaking blade is gradually reduced along the generatrix direction in the order of the inner ring part, the outer ring cambered surface, the gage surface and the gage upper cone part.
6. The drill bit with high trajectory control and high drilling efficiency under pushing force as claimed in claim 1, wherein the number of cutting teeth on said gage surface is n, and n is 2.ltoreq.n.ltoreq.10.
7. The drill bit of claim 1, wherein the drill bit nozzles comprise inner edge nozzles disposed on the bit body between the rock breaking blades, outer edge nozzles disposed on the rock breaking blades;
the inner edge nozzle is communicated with the inner cavity of the drill bit through an inner edge runner, and the outer edge nozzle is communicated with the inner cavity of the drill bit through an outer edge runner.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202311639862.4A CN117345115B (en) | 2023-12-04 | 2023-12-04 | Drill bit with strong track control capability and high drilling efficiency under action of pushing force |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202311639862.4A CN117345115B (en) | 2023-12-04 | 2023-12-04 | Drill bit with strong track control capability and high drilling efficiency under action of pushing force |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN117345115A CN117345115A (en) | 2024-01-05 |
| CN117345115B true CN117345115B (en) | 2024-03-15 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202311639862.4A Active CN117345115B (en) | 2023-12-04 | 2023-12-04 | Drill bit with strong track control capability and high drilling efficiency under action of pushing force |
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