CN112696155A - PDC drill bit with back row tooth water hole - Google Patents
PDC drill bit with back row tooth water hole Download PDFInfo
- Publication number
- CN112696155A CN112696155A CN201911006312.2A CN201911006312A CN112696155A CN 112696155 A CN112696155 A CN 112696155A CN 201911006312 A CN201911006312 A CN 201911006312A CN 112696155 A CN112696155 A CN 112696155A
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- drill bit
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- teeth
- cutting teeth
- water holes
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- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 title claims abstract description 86
- 230000036346 tooth eruption Effects 0.000 claims abstract description 111
- 238000005553 drilling Methods 0.000 claims abstract description 32
- 239000012530 fluid Substances 0.000 claims abstract description 7
- 239000011435 rock Substances 0.000 abstract description 38
- 238000001816 cooling Methods 0.000 abstract description 17
- 230000002035 prolonged effect Effects 0.000 abstract description 8
- 230000000694 effects Effects 0.000 description 15
- 238000004140 cleaning Methods 0.000 description 9
- 239000007788 liquid Substances 0.000 description 7
- 238000000034 method Methods 0.000 description 6
- 238000005299 abrasion Methods 0.000 description 5
- 230000008569 process Effects 0.000 description 4
- 230000009471 action Effects 0.000 description 3
- 239000002131 composite material Substances 0.000 description 3
- 238000005516 engineering process Methods 0.000 description 3
- 239000000243 solution Substances 0.000 description 3
- 238000010276 construction Methods 0.000 description 2
- 230000018109 developmental process Effects 0.000 description 2
- 238000007599 discharging Methods 0.000 description 2
- 230000002349 favourable effect Effects 0.000 description 2
- VNWKTOKETHGBQD-UHFFFAOYSA-N methane Chemical compound C VNWKTOKETHGBQD-UHFFFAOYSA-N 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 238000005507 spraying Methods 0.000 description 2
- 230000004308 accommodation Effects 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000015572 biosynthetic process Effects 0.000 description 1
- 239000002826 coolant Substances 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 229910003460 diamond Inorganic materials 0.000 description 1
- 239000010432 diamond Substances 0.000 description 1
- 238000005265 energy consumption Methods 0.000 description 1
- 239000004744 fabric Substances 0.000 description 1
- 230000006872 improvement Effects 0.000 description 1
- 238000002347 injection Methods 0.000 description 1
- 239000007924 injection Substances 0.000 description 1
- 239000003345 natural gas Substances 0.000 description 1
- 239000003209 petroleum derivative Substances 0.000 description 1
Images
Classifications
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- E—FIXED CONSTRUCTIONS
- E21—EARTH DRILLING; MINING
- E21B—EARTH DRILLING, e.g. DEEP 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
- E21B10/54—Drill bits characterised by wear resisting parts, e.g. diamond inserts the bit being of the rotary drag type, e.g. fork-type bits
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- E—FIXED CONSTRUCTIONS
- E21—EARTH DRILLING; MINING
- E21B—EARTH DRILLING, e.g. DEEP DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
- E21B10/00—Drill bits
- E21B10/42—Rotary drag type drill bits with teeth, blades or like cutting elements, e.g. fork-type bits, fish tail bits
- E21B10/43—Rotary drag type drill bits with teeth, blades or like cutting elements, e.g. fork-type bits, fish tail bits characterised by the arrangement of teeth or other cutting elements
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- E—FIXED CONSTRUCTIONS
- E21—EARTH DRILLING; MINING
- E21B—EARTH DRILLING, e.g. DEEP 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
Abstract
The invention discloses a PDC drill bit with rear row tooth water holes, which belongs to the technical field of oil and gas drilling and comprises a drill bit body and a plurality of blades extending from the drill bit body or fixed on the drill bit body, wherein a drilling fluid flow channel is formed between the adjacent blades, front row cutting teeth are arranged on the blades, at least two rows of cutting teeth are arranged on at least one blade, and water holes, namely rear row tooth water holes, are arranged between the front row cutting teeth and the rear row cutting teeth of at least one blade on the drill bit. The drill bit structure is provided with the rear row of teeth, and when the drill bit drills a hard and high-temperature stratum, the rear row of teeth can cut rocks in time under the condition that the main cutting teeth fail, so that the drilling efficiency of the drill bit in the stratum is improved, and the service life of the drill bit is prolonged. Meanwhile, the blades and the drill body (particularly the runner grooves) are simultaneously provided with water holes, so that the cooling and chip removal capabilities of the drill bit can be further enhanced, the thermal wear of the cutting teeth is greatly weakened, and the drilling capability of the drill bit in high-temperature, high-hardness, high-abrasiveness and heterogeneous strata is further improved.
Description
Technical Field
The invention belongs to the technical field of drilling of petroleum and natural gas, mine engineering, geothermal wells, construction foundation engineering construction, geology, hydrology and the like, and particularly relates to a PDC drill bit with a rear row of tooth water holes.
Background
Drill bits are rock breaking tools used in drilling operations to break rock and form wellbores. Besides the cutting structure, the hydraulic structure on the drill bit plays an important role in the rock breaking efficiency and the service life of the drill bit, namely, cooling the cutting teeth, cleaning the well bottom, transporting rock debris, assisting in rock breaking and the like. At present, the hydraulic structure on the drill bit is designed by arranging nozzles or water holes at different positions on a drill bit body, and drilling fluid or cooling medium in an inner flow passage is sprayed out through the nozzles or the water holes so as to achieve the purposes of cleaning and cooling cutting teeth. Meanwhile, aiming at the condition that the service life of the drill bit is shortened due to the failure of the main cutting teeth when the drill bit is in a complex and difficult-to-drill stratum, the drill bit is provided with the rear row of teeth to replace the failed main cutting teeth to break rocks, so that the service life of the drill bit is prolonged.
In modern fast drilling technology, a drill bit is required to have excellent hydraulic performances such as a rock breaking and cutting structure, shaft bottom cleaning, rock debris transportation, cutting tooth cooling and cleaning and the like. The hydraulic structure and the blade cutting teeth of the conventional drill bit are designed only aiming at specific stratum, and firstly, the design of the corresponding drill bit is carried out aiming at soft stratum to prevent the drill bit mud pocket caused by excessive rock debris in the drilling of the soft stratum; secondly, the design of a corresponding drill bit is carried out aiming at the hard stratum to prevent the cutting teeth from generating larger heat due to overlarge friction in the drilling process of the hard stratum, so that the cutting teeth cannot be cooled in time to generate the thermal wear phenomenon. The drill bit can only drill for soft stratum or hard stratum and other single stratum, but cannot drill for both soft and hard stratum. When the formation is hard, one of the common methods for improving the service life of the cutting teeth on the blades is to provide the blades with the back row of cutting teeth, which are usually disposed in the outer radial regions of the drill bit (e.g., the nose and the regions other than the nose).
When the distance between the nozzle and the cutting teeth is large (namely, large spraying distance), the hydraulic on-way energy loss is large, and rock debris cannot be cleaned and moved in time when drilling into a soft stratum, so that the rock debris is continuously accumulated, a bit mud pocket is generated, and finally the bit fails; when the drill bit is drilled into a hard stratum, the cutting teeth can not be timely and fully cooled due to the friction effect, so that the thermal abrasion of the cutting teeth is generated, the failure of the cutting teeth of the drill bit is accelerated, under the condition that the cutting teeth of the drill bit fail, the abrasion of the blade body can be quickly caused, and the use efficiency of the drill bit is greatly reduced. Particularly, in recent years, the rapid development of geothermal drilling is that the working temperature of the drill bit is as high as 150 degrees or higher, the probability of thermal abrasion of cutting teeth is greatly improved, and the service life and the drilling performance of the drill bit can be obviously reduced.
With the continuous development of well drilling, not only soft strata or hard strata, but also various different strata and alternate soft and hard strata are encountered in actual well drilling. The conventional drill bit cannot simultaneously meet the requirements of preventing mud pockets in a soft stratum and avoiding the thermal abrasion phenomenon of cutting teeth in a hard stratum.
Disclosure of Invention
The invention aims to: the PDC drill bit with the rear row tooth water hole is provided aiming at the defects of the prior drill bit technology, the problem that the cooling effect of the rear row cutting teeth of the drill bit is poor, rock debris is difficult to discharge in time, and then the rock breaking efficiency of the drill bit is reduced, and the service life of the drill bit is prolonged is solved.
The purpose of the invention is realized by the following technical scheme:
the utility model provides a PDC drill bit with back row tooth water hole, includes the drill bit body, extends from the drill bit body or fixes a plurality of wing on the drill bit body, forms the drilling fluid runner between the adjacent wing, be provided with the front row cutting teeth on the wing, and have at least the cutting teeth on a wing to have two rows of its characterized in that at least: a water hole, namely a rear row tooth water hole, is arranged between the front row cutting tooth and the rear row cutting tooth of at least one blade on the drill bit.
Front row cutting teeth: in the direction of rotation of the drill bit, the cutting teeth closer to the front on the same blade are the front row cutting teeth (called front row teeth for short), and are also the teeth which are firstly contacted with the rock to cut during the working process of the drill bit. The front row of cutting teeth are positioned at the edge of the blade or the edge of the flow passage, the cooling and chip removal conditions are good, so the cutting teeth are preferably arranged as the front row of cutting teeth. Because the space for distributing the teeth at the front edge of the blade is limited, in order to prolong the service life of the cutting teeth on the drill bit when the stratum is hard or has strong heterogeneity, a back row of cutting teeth (called back row teeth for short) can be arranged behind the front row of cutting teeth. The rear row of teeth are mostly arranged at the crown top and the area outside the crown top, and the rear row of teeth can be arranged in one row or multiple rows or can be arranged dispersedly behind the front row.
In the above scheme, when the front row of cutting teeth are worn to a certain degree, the rear row of cutting teeth start to break rock, or the front row of cutting teeth and the rear row of cutting teeth break rock simultaneously, so that the service life of the drill bit cutting structure is prolonged. Particularly in the stratum which is difficult to drill and has high temperature, the cutting teeth are easy to wear and lose efficacy, and the service life of the cutting structure of the drill bit in the stratum can be greatly prolonged. The water holes are formed between the front row of cutting teeth and the rear row of cutting teeth of the blade, so that the space on the blade body is effectively utilized, the cooling and cleaning effects of a hydraulic system on the rear row of cutting teeth can be obviously improved, the thermal abrasion of the cutting teeth caused by friction in the high-temperature geothermal drilling and hard stratum drilling processes is effectively reduced, and the drilling capability of the drill bit is enhanced.
Alternatively, the water holes between the front row of cutting teeth and the rear row of cutting teeth of the blade are string-shaped water holes.
The outlet shape of the water hole is formed by two or more circular, elliptical, multi-deformation and other shapes which are communicated in series, and the string-shaped structure is called as string-shaped water hole or string-shaped water hole. In the above scheme, the string-shaped water holes are arranged between the front row of cutting teeth and the rear row of cutting teeth, so that the liquid flow flowing out from the water holes is more concentrated, the concentrated liquid flow is used for cooling and cleaning the rear row of cutting teeth, and the utilization rate of hydraulic energy is greatly increased. The scheme has better and obvious effect particularly in high-temperature geothermal drilling.
Optionally, a rear row of tooth grooves are arranged between the front row of cutting teeth and the rear row of cutting teeth of the blade, and the rear drain holes are arranged in the rear row of tooth grooves. The grooves of the back row of teeth can be pits with equivalent length and width dimensions, and can also be grooves with larger difference in length and width dimensions, which are called grooves for short.
Among the above-mentioned scheme, the wing back row tooth can produce a large amount of detritus at the rock cutting in-process, because the space between the wing body of sword and the shaft bottom is narrow and small, some detritus is piled up easily, the adhesion is on the wing body of sword, especially on the cloth tooth working face of wing, the accommodation space between the wing body of sword and the shaft bottom can be increased on the one hand to the recess, the action range in back row tooth water hole can be widened to the liquid stream in the on the other hand recess, improve its effect, effectively reduce and avoid the detritus to pile up and the adhesion in the wing back row tooth region, thereby be favorable to the discharge of detritus more.
Alternatively, the gauge block is provided with a gauge block flow channel groove which is communicated with a groove between the front row of cutting teeth and the rear row of cutting teeth on the blade, and the rear row of tooth water holes are arranged in the groove.
In the scheme, the gauge block flow channel groove is communicated with the rear row of tooth grooves on the cutter blade, a flow channel for effectively discharging rock debris cut by the rear row of teeth is established on the cutter blade body, and the rear row of tooth water holes, the rear row of tooth grooves and the gauge block flow channel groove form a hydraulic subsystem specially serving the rear row of teeth, so that the rear row of teeth of the cutter blade can be cooled and discharged.
Optionally, the blade is provided with a plurality of rows of rear rows of teeth, and the rear rows of teeth water holes are arranged between the front rows of teeth and the last rows of teeth.
Among the above-mentioned scheme, set up the back row of tooth of multirow on the wing working face, under main cutting tooth and partial back row tooth condition of inefficacy, still all the other back row teeth carry out the broken rock of cutting tooth, can improve the broken rock efficiency of drill bit, increase drill bit life, back row tooth water hole sets up between front row tooth and last row tooth, can reach and carry out high-efficient cooling, abluent purpose to back row tooth.
Alternatively, a plurality of rows of rear rows of teeth are arranged on the blade, and the rear row of tooth water holes are formed between the front row of teeth and other rear rows of teeth except the last row of teeth.
Among the above-mentioned scheme, the back row tooth water hole sets up between front row tooth and other back row teeth except that last row tooth, can further improve cooling, the cleaning performance to back row tooth through the position in rationally setting up back row tooth water hole, more is favorable to improving the life of drill bit.
Alternatively, nozzles or water holes are provided in the water channels between the blades.
In the scheme, the water channel between the blades is provided with the nozzle or the water hole, so that the drill bit can be cooled in an auxiliary manner, and the cleaning effect of well bottom rock debris is enhanced.
Compared with the prior art, the invention has the beneficial effects that:
1. the drill bit structure is provided with the rear row of teeth, and when the drill bit is used for drilling hard and high-temperature stratums, the rear row of teeth can cut rocks in time under the condition that the main cutting teeth fail, so that the drilling efficiency of the drill bit in the stratums is improved, and the service life of the drill bit is prolonged. Meanwhile, the water holes are formed in the positions of the rear row of teeth, the rear row of teeth can be cooled in time, and the phenomenon that the rear row of teeth fails in advance due to poor cooling or poor cooling effect is avoided.
2. The jet distance of the water holes is obviously shortened, the jet speed of liquid flow passing through the working surface of the cutting teeth is higher, the bottom of a well can be cleaned in time, rock debris can be effectively transported, and the cutting teeth are suitable for soft, hard and soft-hard alternate strata. Meanwhile, the jet distance of the water holes is shortened, so that the energy consumption of liquid flow beams jetted by the water holes on the working surface of the blade is low, and the auxiliary damage effect on the rocks at the bottom of the well is better. Particularly, the water holes or the string-shaped water holes arranged on the cutter wing body can be better applied to geothermal drilling, so that the concentrated injection effect of the cutting teeth is improved.
3. In the scheme that is provided with back row tooth recess on the wing, can further reduce the adhesion of detritus on the wing working face, the detritus discharge effect is better.
4. When the blades and the drill body (particularly the runner grooves) are simultaneously provided with the water holes, the cooling and chip removal capabilities of the drill bit are further enhanced, the thermal wear of the cutting teeth is greatly weakened, and the drilling capability of the drill bit in high-temperature, high-hardness, high-abrasiveness and heterogeneous strata is further improved.
Drawings
In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings that are required to be used in the embodiments will be briefly described below, it should be understood that the following drawings only illustrate some embodiments of the present invention and therefore should not be considered as limiting the scope, and for those skilled in the art, other related drawings can be obtained according to the drawings without inventive efforts.
FIG. 1 is a schematic view of a PDC bit having a rear row of tooth water holes.
FIG. 2 is a schematic view of a drill bit with water holes in series between the front row of cutting teeth and the back row of cutting teeth of the blades.
FIG. 3 is a cross-sectional view taken along the longitudinal direction of the tooth water holes in the back row on the blade body.
FIG. 4 is a schematic view of a drill bit with a groove between the front row of cutting teeth and the rear row of cutting teeth and a rear row of teeth water holes in the groove.
FIG. 5 is a schematic view of a drilling tool with a series of water holes in a groove between the front row of cutting teeth and the rear row of cutting teeth of the blade.
Fig. 6 is a cross-sectional view taken along B-B of fig. 5.
FIG. 7 is a schematic view of the channel groove of the gauge block communicating with the groove of the rear row of teeth of the blade, and the drill bit with water holes disposed in the groove.
FIG. 8 is a schematic view of a drill bit having a channel groove of a diameter block communicating with a groove of a rear row of teeth of a blade and a string-shaped water hole formed in the groove.
FIG. 9 is a schematic view of a drill bit having a plurality of rows of rear rows of teeth and rear rows of teeth holes on the blades.
FIG. 10 is a schematic view of a drill bit with rows of rear rows of teeth and water holes of the rear rows of teeth being string-shaped water holes.
FIG. 11 is a schematic view of a drill with water holes arranged in a water channel between blades.
Corresponding part names are labeled in the drawings: 1-bit body, 2-blade, 21-front row cutting teeth, 22-first back row cutting teeth, 23-second back row cutting teeth, 201-back row round water holes on blade, 202-back row string water holes on blade, 24-back row tooth grooves on blade, round water holes in 241-grooves, string water holes in 242-grooves, 3-runner groove, round water holes in 31-runner groove, string water holes in 32-runner groove, and 4-bit body gauge protection block.
Detailed Description
In order to make the objects, technical solutions and advantages of the embodiments of the present invention more apparent, the technical solutions of the embodiments of the present invention will be described clearly and completely with reference to the accompanying drawings of the embodiments of the present invention, and it is obvious that the described embodiments are some, but not all embodiments of the present invention. All other embodiments, which can be obtained by a person skilled in the art without any inventive step based on the embodiments of the present invention, are within the scope of the present invention. Thus, the following detailed description of the embodiments of the present invention, presented in the figures, is not intended to limit the scope of the invention, as claimed, but is merely representative of selected embodiments of the invention.
Examples
The embodiment of the invention provides a PDC drill bit with a rear row of tooth water holes. Referring to fig. 1, the drilling fluid comprises a bit body 1 and a plurality of blades 2 extending from the bit body or fixed on the bit body 1, wherein a drilling fluid flow channel 3 is formed between adjacent blades 2, the blades 2 are provided with front rows of cutting teeth 21, and at least one blade 2 has at least two rows of cutting teeth, and the drilling fluid is characterized in that: the drill bit 1 is provided with a water hole 201 between the front row of cutting teeth 21 and the rear row of cutting teeth 22 of at least one blade 2. In the prior art, the water holes 31 are generally arranged on the bit body, so that the water holes 31 are far away from the well bottom or the cutting teeth 21 and 22, and the utilization rate of hydraulic energy is reduced. In the invention, the rear row tooth water holes 201 are formed in the working surface of the cutter wing where the rear row cutting teeth 22 are located, so that the spraying distance of the water holes is obviously reduced, the cutting teeth can be timely and fully cooled, the occurrence of thermal wear is reduced, meanwhile, rock debris generated by the cutting teeth 21 and 22 can be moved by enough energy, the probability of mud pockets is reduced, and meanwhile, the rear row teeth 22 on the cutter wing 2 can greatly prolong the service life of the cutting teeth, thereby increasing the drilling efficiency of the drill bit.
Further, as a worker in the field, it is more easily conceivable that the water holes of the front row of cutting teeth and the rear row of cutting teeth on the blade are serial water holes to enhance the radial coverage of the water holes on the blade and perform a balanced cooling effect on the cutting teeth, and this scheme is more suitable for high-temperature geothermal drilling, as shown in fig. 2, 3 and 10. The more preferable scheme is that the water holes of the front row of cutting teeth and the rear row of cutting teeth on the blade are string-shaped water holes, the radial tooth distribution coverage area of the water holes is more than 60%, namely L1/L is more than or equal to 0.6, wherein L is the radial tooth distribution coverage area, and L1 is the radial coverage area of the working surface of the blade where the liquid flow of the string-shaped water holes reaches, please refer to FIGS. 2 and 3.
The rock debris crushed by the cutting teeth finally enters the annular space through the runner groove, and if the rock debris entering the chip discharge groove cannot be smoothly discharged, the rock debris can be blocked in the runner groove, so that a mud pocket is formed. In order to avoid the phenomenon, the invention also provides a technical scheme that water holes are simultaneously arranged among the front row of cutting teeth, the rear row of cutting teeth and the drill body (or in the runner groove) on the blade, so that the cooling and chip removal capabilities of the drill bit are further enhanced, and refer to fig. 4.
During rock breaking of the cutting teeth, part of rock debris is in contact with the working surface of the blade and adheres to the working surface of the blade, and particularly the rock debris is easy to adhere between the rear row teeth and the main cutting teeth. In order to solve the problem, a groove is arranged between the front row of cutting teeth and the rear row of teeth, and water holes are arranged in the groove, so that the rock debris on the cutter wing can be lubricated, the adhesion effect of the rock debris on the cutter wing body (particularly between the main cutting teeth and the rear row of teeth) can be greatly reduced, the action range of the water holes of the rear row of teeth can be widened by liquid flow in the groove, and the action effect is improved, as shown in fig. 4, 5, 6 and 11. Meanwhile, the channel groove is formed in the gauge of the drill bit body and communicated with the groove of the rear row of teeth, so that a channel for effectively discharging rock debris in the rear row of teeth area is formed, and the cooling efficiency and the cleaning effect of the drill bit are improved, as shown in fig. 7 and 8.
During the rock breaking process, the rock generates larger reaction force to the cutting teeth, so that the failure of the cutting teeth, particularly the failure of the main cutting teeth, is easily caused. When the stratum conditions are complex, the back row cutting teeth can also be subjected to failure in different degrees, and the cutter wing body is provided with a plurality of rows of cutting teeth, so that the rock breaking efficiency of the failed main cutting teeth and the back row teeth can be compensated, and the service life of the drill bit is prolonged. Meanwhile, the water holes are formed in the positions of the rear rows of cutting teeth, so that the cooling effect of the rear rows of teeth can be better considered, the service life of the drill bit is greatly prolonged, and the drilling efficiency is increased, as shown in fig. 9 and 10.
The technology is suitable for various drill bits which adopt PDC blades as cutting structures, including PDC drill bits, PDC-roller cone composite drill bits, PDC-disc cutter composite drill bits and the like, the used cutting teeth (including a front row of cutting teeth and a rear row of cutting teeth) are generally conventional circular PDC cutting teeth, and also include cutting teeth or cutting elements such as PDC teeth, special-shaped PDC teeth (including oval teeth, pointed teeth and the like), diamond composite teeth with three-dimensional working surfaces (such as ridge teeth, pointed cone teeth and the like), TSP teeth, diamond-impregnated cutting teeth and the like which can rotate around the central axis of the cutting teeth.
The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention, and various modifications and changes may be made by those skilled in the art. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.
Claims (7)
1. The utility model provides a PDC drill bit with back row tooth water hole, includes the drill bit body, extends from the drill bit body or fixes a plurality of wing on the drill bit body, forms the drilling fluid runner between the adjacent wing, is provided with the front row cutting teeth on the wing, and the cutting teeth on at least one wing have two rows of its characterized in that at least: a rear row of tooth water holes are arranged between the front row of cutting teeth and the rear row of cutting teeth of at least one blade on the drill bit.
2. The PDC bit having a rear row of tooth water holes of claim 1 wherein: and the rear row of tooth water holes between the front row of cutting teeth and the rear row of cutting teeth of the blade are string-shaped water holes.
3. The PDC bit having a rear row of tooth water holes of claim 1 wherein: a groove is formed between the front row of cutting teeth and the rear row of cutting teeth of the blade, and a rear row of tooth water hole is formed in the groove.
4. The PDC bit having a rear row of tooth water holes of claim 1 wherein: a groove is formed between the front row of cutting teeth and the rear row of cutting teeth of the blade, a rear row of tooth water holes are formed in the groove, a gauge block flow channel is formed in the gauge block of the blade, and the groove is communicated with the gauge block flow channel.
5. The PDC bit having a rear row of tooth water holes of claim 1 wherein: the blade working surface is provided with a plurality of rows of rear rows of teeth, and the rear rows of tooth water holes are formed between the front rows of teeth and the last rows of teeth.
6. The PDC bit having a rear row of tooth water holes of claim 1 wherein: the blade working surface is provided with a plurality of rows of rear-row teeth, and rear-row tooth water holes are formed between the front-row teeth and other rear-row teeth except the last row of teeth.
7. The PDC bit having a rear row of tooth water holes of claim 1 wherein: and a nozzle or a water hole is arranged in the water channel between the blades.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201911006312.2A CN112696155A (en) | 2019-10-22 | 2019-10-22 | PDC drill bit with back row tooth water hole |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201911006312.2A CN112696155A (en) | 2019-10-22 | 2019-10-22 | PDC drill bit with back row tooth water hole |
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| CN112696155A true CN112696155A (en) | 2021-04-23 |
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| CN201911006312.2A Pending CN112696155A (en) | 2019-10-22 | 2019-10-22 | PDC drill bit with back row tooth water hole |
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