CN115110898A - Compaction wall-fixing drill bit and drilling tool - Google Patents
Compaction wall-fixing drill bit and drilling tool Download PDFInfo
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- CN115110898A CN115110898A CN202210937018.9A CN202210937018A CN115110898A CN 115110898 A CN115110898 A CN 115110898A CN 202210937018 A CN202210937018 A CN 202210937018A CN 115110898 A CN115110898 A CN 115110898A
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- 238000005553 drilling Methods 0.000 title claims abstract description 76
- 238000005056 compaction Methods 0.000 title claims abstract description 43
- 239000011435 rock Substances 0.000 claims abstract description 15
- 230000000694 effects Effects 0.000 claims abstract description 12
- 238000009826 distribution Methods 0.000 claims description 22
- 238000000034 method Methods 0.000 claims description 10
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- 238000010008 shearing Methods 0.000 claims description 4
- 230000015572 biosynthetic process Effects 0.000 claims description 2
- 238000004904 shortening Methods 0.000 abstract description 2
- 239000007789 gas Substances 0.000 description 63
- 239000002689 soil Substances 0.000 description 28
- 238000005516 engineering process Methods 0.000 description 9
- 230000009471 action Effects 0.000 description 7
- 238000009527 percussion Methods 0.000 description 7
- 239000000956 alloy Substances 0.000 description 6
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- 238000004140 cleaning Methods 0.000 description 2
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- 238000005520 cutting process Methods 0.000 description 2
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- 238000007789 sealing Methods 0.000 description 2
- 239000007787 solid Substances 0.000 description 2
- 238000009987 spinning Methods 0.000 description 2
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- E—FIXED CONSTRUCTIONS
- E21—EARTH OR ROCK DRILLING; MINING
- E21B—EARTH OR ROCK DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
- E21B10/00—Drill bits
- E21B10/36—Percussion drill bits
- E21B10/38—Percussion drill bits characterised by conduits or nozzles for drilling fluids
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- E—FIXED CONSTRUCTIONS
- E21—EARTH OR ROCK DRILLING; MINING
- E21B—EARTH OR ROCK DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
- E21B10/00—Drill bits
- E21B10/36—Percussion drill bits
- E21B10/40—Percussion drill bits with leading portion
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Abstract
The invention provides a compaction wall-fixing drill bit and a drilling tool, wherein the compaction wall-fixing drill bit is suitable for gas drilling and comprises a joint, a concave body, a circular truncated cone body and a step body which are sequentially connected. The step body comprises a plurality of stages of annular steps which are coaxially arranged, the diameter of the step body is gradually increased from top to bottom, and the step body can extrude rock debris to the periphery to compact a well wall; the circular truncated cone body is a trapezoidal circular truncated cone, the diameter of the circular truncated cone body is gradually increased from top to bottom, the diameter of the upper end of the circular truncated cone body is the same as that of the lower end of the step body, and the circular truncated cone body can further compact and smooth the well wall; from top to bottom, the diameter of the concave body is gradually reduced, and the diameter of the upper end of the concave body is the same as that of the lower end of the circular truncated cone; the concave body can generate a secondary compaction effect on the hole wall; the joint is arranged at the lower end of the concave body to be connected with the impactor. The drilling tool comprises the compacted solid-wall drill bit. The compacted wall-fixing drill bit can not cause the instability of the well wall, and can effectively avoid the shortening of the designed layer section or the early ending of gas drilling.
Description
Technical Field
The invention relates to the technical field of gas drilling while-drilling wall-fixing drill bits, in particular to a compaction wall-fixing drill bit and a drilling tool.
Background
With the progress of science and technology, the drilling technology is rapidly developed, and particularly, the gas drilling technology causes the heat tide of domestic gas drilling due to the obvious advantages of the gas drilling technology. Gas drilling technology plays an important role in drilling speed increase, discovery of low-pressure and low-permeability reservoirs and benefit development. Only in 2008 in the Yu Chuan area, gas drilling is carried out for 90 wells, the drilling speed is effectively increased by 4-14 times by advancing the drill at 99868 m. However, borehole wall instability has been a bottleneck problem that plagues the development of gas drilling, and statistically, about one third of gas drilling causes a shorter design interval or ends the gas drilling in advance due to borehole wall instability. Therefore, the borehole wall stability is the problem to be solved in the gas drilling process, and is a prerequisite for whether gas drilling can be adopted in the drilling design.
Therefore, the development of a special compaction drill bit for a gas drilling wall fixing technology is needed, the application range of the gas drilling technology is further expanded, and the drilling footage of the gas drilling is improved.
Chinese patent with application number "CN 201310559444.4" and name "spinning compaction drill" discloses a spinning compaction drill suitable for percussion-rotary compaction drilling conditions. The drill bit comprises a first hard alloy spherical tooth, a drill bit body, a sealing cover, a lower joint, an anvil block, a return spring, a second hard alloy spherical tooth, a sealing ring and a third hard alloy spherical tooth. When the rotary percussion compaction drill bit is matched with a percussion lance to impact rotary compaction drilling, the second hard alloy spherical teeth on the surface of the drill bit body cut a stratum under the rotary action of the drill bit body, pebbles and boulders in the stratum are crushed by the first hard alloy spherical teeth and the third hard alloy spherical teeth at the end part of the drill bit body under the action of impact load and then extruded to the side wall, crushed rock debris is discharged to the cylindrical section of the drill bit body through the spiral debris containing groove, and the rock debris is extruded into the stratum around the hole wall by the cylindrical section of the drill bit body, so that the compaction drilling is realized. The drill bit can be matched with the percussion lance to realize rotary percussion compaction drilling, is generally suitable for stratums such as frozen soil, sandy gravel layers and the like, and can obtain higher drilling efficiency and good drilling quality. But the structure of this drill bit is different with this application, and does not consider the secondary destruction that the big discharge capacity gas sand-carrying washed away the lateral wall and causes, does not possess the secondary compaction function.
The Chinese patent with the application number of 'CN 201820912138.2' and the name of 'a spiral soil-extruding drill bit' discloses a spiral soil-extruding drill bit suitable for civil engineering. The drill bit comprises a drill tip, a soil squeezing rod and a spiral blade. The lower end of the soil squeezing rod is provided with a drill point, the upper end of the soil squeezing rod is connected with a drill rod, the soil squeezing rod is provided with at least one soil squeezing and expanding unit, the soil squeezing and expanding unit is in a frustum shape with the diameter gradually reduced from bottom to top, the soil squeezing rod and the soil squeezing and expanding unit are continuously wound with a squeezing and expanding helical blade from bottom to top, the squeezing and expanding helical blade is smoothly connected with a helical blade on the drill rod, the squeezing and expanding helical blade is in a frustum shape with the diameter gradually increased from bottom to top, the pitch of the squeezing and expanding helical blade wound on the soil squeezing rod and the soil squeezing and expanding unit is gradually increased from bottom to top, rapid drilling and expanding are realized through the simultaneous action of the upper conical soil squeezing and expanding unit and the conical squeezing and expanding helical blade, and the soil squeezing and expanding drill bit has the advantages of good soil squeezing effect, high soil squeezing efficiency, capacity and frictional resistance of a large pile, and the like. However, the structure of the drill bit is different from that of the application, and the drill bit is not suitable for the field of oil drilling.
Chinese patent with application number of CN201720018390.4 and name of percussion rotary compaction drill bit discloses a percussion rotary compaction drill bit relating to the technical field of drilling. The drill bit comprises a joint, a cylindrical body and a conical body. The connector is provided with a square clamping groove, the square clamping groove is connected to the impactor, an inner air inlet duct is arranged in the middle of the square clamping groove and penetrates through the columnar body and the conical body, the inner air inlet duct is communicated with an inner air dividing duct, the inner air dividing duct is arranged on the inner side of the conical body and communicated with an air outlet hole in a groove of the conical body, the groove air outlet hole is communicated to a groove of the conical body, the groove of the conical body is arranged on the outer side surface of the conical body, and the groove of the conical body is communicated to an air outlet groove. The bayonet on the drill rod is inserted into the square clamping groove of the connector. The square clamping groove is also provided with a bolt hole, a connecting bolt is arranged in the bolt hole, and the impacter and the square clamping groove are fixedly connected through the connecting bolt. The drill bit realizes impact rotation compaction hole forming, the hole wall is smooth and does not collapse, the pulling resistance is strong, the drilling efficiency is high, the hole forming quality is good, and the construction site is pollution-free. But the drill bit is different from the structure of the application and does not have the secondary compaction function.
Chinese patent with application number of CN202023276175.5 and name of spiral reverse compaction drill discloses an impact rotary compaction drill which relates to the technical field of drilling. The drill bit comprises a main drill bit fixedly arranged below the drill rod and a percussion drill bit fixedly arranged at the bottom of the main drill bit. Wherein the main drill bit includes forward drill bit and backward drill bit, all has set firmly helical blade on forward drill bit and the backward drill bit circumference lateral wall, and the helical blade that is located on the forward drill bit is opposite with the helical blade that is located on the backward drill bit soon. And the drill rod is also provided with a soil retaining piece, and the soil retaining piece is used for blocking soil turned out during drilling. The drill bit effectively reduces the quantity of soil turned to the ground during drilling, thereby achieving the effect of effectively saving the subsequent construction cost. But this drill bit is different with the structure of this application, is applicable to soil layer, rock and creeps into, does not see its application in oil drilling field, does not possess the secondary crowded dense function yet.
Disclosure of Invention
In view of the deficiencies in the prior art, it is an object of the present invention to address one or more of the problems in the prior art as set forth above. For example, it is an object of the present invention to provide a compact solid wall drill.
In order to achieve the above object, the present invention provides, in one aspect, a compacted wall drill including a joint, a concave body, a truncated cone body, and a step body, which are connected in sequence, wherein,
the step body comprises a plurality of stages of annular steps which are coaxially arranged, the diameter of the step body is gradually increased from top to bottom, and the step body can squeeze rock debris to the periphery to compact a well wall in the drilling process;
the circular truncated cone body is a trapezoidal circular truncated cone, the diameter of the circular truncated cone body is gradually increased from top to bottom, the diameter of the upper end of the circular truncated cone body is the same as that of the lower end of the step body, and the circular truncated cone body can further compact and smooth a well wall;
from top to bottom, the diameter of the concave body is gradually reduced, the diameter of the upper end of the concave body is the same as that of the lower end of the truncated cone body, and the concave body can perform a secondary compaction effect on the hole wall in the drilling process;
the joint is arranged at the lower end of the concave body to be connected with an impactor.
According to an exemplary embodiment of an aspect of the present invention, the step body may be provided with cutting teeth on a surface thereof, the cutting teeth being capable of performing impact, shear damage to the formation.
According to an exemplary embodiment of an aspect of the present invention, an inner portion of the joint may be provided with an air intake passage extending up to an inner portion of the concave body in a direction of the central axis.
According to an exemplary embodiment of an aspect of the present invention, a plurality of exhaust holes may be circumferentially symmetrically disposed on a surface of the step body, a total sectional area of the exhaust holes may be smaller than a sectional area of the intake passage, and a ratio of the total sectional area of all the exhaust holes to the sectional area of the intake passage may be 30:35 to 32: 33.
According to an exemplary embodiment of an aspect of the present invention, the concave body may be provided at an inner portion thereof with an air distribution passage communicating with the air inlet passage, the air distribution passage extending through the truncated cone to a surface of the stepped body and being correspondingly connected to the air outlet hole.
According to an exemplary embodiment of an aspect of the present invention, the gas distribution channel may be provided in plurality, and the diameter of the gas distribution channel is smaller than that of the gas inlet channel, and an included angle between the gas distribution channel in the same direction and a central axis of the compacted solid wall drill is 35 ° to 45 °.
According to an exemplary embodiment of an aspect of the present invention, the joint may be provided with a thread thereon to connect the impactor.
According to an exemplary embodiment of an aspect of the present invention, the multi-stage annular step may include 7 to 11 stages.
According to an exemplary embodiment of an aspect of the present invention, a diameter of each step of the multi-step annular steps may be equal to a difference in diameters of steps of adjacent layers.
In another aspect of the invention, there is provided a drilling tool comprising a compacted solid-wall drill bit as described above.
Compared with the prior art, the invention has the beneficial effects that at least one of the following contents is included:
(1) the compaction wall-fixing drill bit provided by the invention is simple and convenient in structure;
(2) the compacted wall-fixing drill bit provided by the invention can provide a feasible scheme for processing complex gas drilling and extending footage;
(3) the compacted wall-fixing drill bit provided by the invention can keep the instability of the well wall, and can effectively avoid the shortening of the designed layer section or the early ending of gas drilling;
(4) the compaction wall-fixing drill bit provided by the invention considers the secondary damage caused by the sand carried by large-discharge gas on the well wall scouring, further influences the compaction wall-fixing effect, and has a secondary compaction function.
Drawings
The above and other objects and features of the present invention will become more apparent from the following description taken in conjunction with the accompanying drawings, in which:
FIG. 1 shows a schematic structural view of a compacted wall bit according to an exemplary embodiment of the present invention;
FIG. 2 shows a top view of FIG. 1;
fig. 3 shows a cross-sectional view along the direction a-a in fig. 2.
Reference numerals:
1-joint, 101-air inlet channel, 2-concave body, 201-air distribution channel, 3-round table body, 4-step body, 401-cutting tooth, 402-air outlet hole and 5-impactor.
Detailed Description
Hereinafter, a compacted wall drill bit and a drilling tool according to the present invention will be described in detail with reference to the accompanying drawings and exemplary embodiments.
It should be noted that "first," "second," and the like are merely for convenience of description and for ease of distinction, and are not to be construed as indicating or implying relative importance. "Upper," "lower," "inner," "front," and the like are merely for convenience in describing and establishing relative orientations or positional relationships, and do not indicate or imply that the referenced components must have that particular orientation or position.
FIG. 1 shows a schematic structural view of a compacted wall bit according to an exemplary embodiment of the present invention; FIG. 2 shows a top view of FIG. 1; fig. 3 shows a cross-sectional view along the direction a-a in fig. 2.
In the first exemplary embodiment of the present invention, as shown in fig. 1, the compacted wall drill mainly includes a joint 1, a concave body 2, a truncated cone body 3, and a step body 4, which are connected in this order.
The step body 4 comprises a plurality of coaxially arranged annular steps, and the diameters of the annular steps are gradually increased from top to bottom. In the drilling process, soil is damaged under the micro-shearing action of each step of the step body 4, and rock debris is extruded and compacted to the periphery by the step body 4.
The truncated cone 3 is a trapezoidal truncated cone, the diameter of the truncated cone 3 gradually increases from top to bottom, and the diameter of the upper end face of the truncated cone 3 is the same as the diameter of the lower end face of the step 4. The compaction wall-fixing drill bit cuts into and breaks stratum, the step body 4 and the circular table body 3 have compaction effect on soil body, rock debris is squeezed to the periphery in a matched mode to fix the wall, the speed and the effect of gas drilling are improved, the application range of the gas drilling technology is further expanded, and the gas drilling footage is improved. Here, the circular truncated cone 3 is used for further compacting and smoothing the well wall.
The upper portion of the concave body 2 is a convex body section, the diameter of which is gradually reduced from top to bottom, and the diameter of the upper end surface of the convex body section is the same as the diameter of the lower end surface of the truncated cone 3. The lower part of the concave body 2 is a cylindrical section, and the diameter of the cylindrical section is the same as that of the lower end surface of the convex body section. In the lifting process of the drilling tool, the concave body 2 positioned at the tail part of the wall-compaction drill bit can generate a secondary compaction effect on a well wall, so that the wall-compaction while drilling of gas drilling is facilitated, an implementable scheme is provided for complex treatment and footage extension of the gas drilling, and the smooth operation of the gas drilling under the condition of a complex stratum is ensured. The compaction wall-fixing drill bit has a secondary compaction function, so that various problems caused by the complex conditions of the underground such as the fact that the casing is not put down in place due to the instability of the well wall, the reaming period is long after slurry replacement, the drilling is blocked and the like can be reduced, the drilling operation efficiency is further improved, and the operation period is shortened.
The joint 1 is arranged at the lower end of the concave body 2 for connecting with an impactor 5. The impactor 5 is a power tool capable of generating impact action and can drive a drill bit to impact the stratum. Here, the joint 1, the concave body 2, the truncated cone body 3, and the step body 4 may be integrally molded.
In the present exemplary embodiment, as shown in fig. 1 or fig. 2, the step body 4 may be provided with cutting teeth 401, the cutting teeth 401 are uniformly distributed on the surface of each step of the step body 4, and the cutting teeth 401 on the surface of each step are spaced at a certain distance. The diameter of the cutting tooth 401 is less than the width of the step in which it is located. The cutting teeth 401 can impact and shear the stratum, and the shearing efficiency of the step body 4 to the soil layer rock mass is improved.
In the present exemplary embodiment, as shown in fig. 3, the inside of the joint 1 may be provided with an intake passage 101 in the central axis direction, the intake passage 101 extending from the bottom end of the joint 1 up to the convex body section of the concave body 2.
In the present exemplary embodiment, as shown in fig. 2, a plurality of exhaust holes 402 may be circumferentially symmetrically provided on the surface of the step body 4. The ratio of the total sectional area of the exhaust holes to the sectional area of the intake passage may be 30:35 to 32: 33. For example, 30:32, 32:33 or 32: 34. Here, the total cross-sectional area of the exhaust port smaller than the cross-sectional area of the intake passage may lose part of the impact energy of the impactor, but the increase in the wind speed at the exhaust port may reduce the clogging of the exhaust port, and may be more advantageous for gas drilling.
In the present exemplary embodiment, as shown in fig. 3, the inside of the concave body 2 may be provided with a gas distribution passage 201 communicating with the gas intake passage 101. The gas distribution channel 201 passes through the circular truncated cone 3 and extends to the surface of the step body 4 and is correspondingly communicated with the exhaust hole 402 in fig. 1. The gas inlet channel 101 is a channel for gas to flow into the drill bit, and the gas distribution channel 201 is a channel inside the drill bit connected to the annular space between the drill bit and the borehole wall. The number of the gas distributing channels is the same as that of the exhaust holes, and the gas distributing channels are circumferentially and symmetrically arranged along the central axis of the drill bit. The diameter of the gas distribution channel 201 is smaller than that of the air inlet channel 101, and pressure generated by the difference between the cross sections of the gas distribution channel and the air inlet channel can drive rock debris to move. Specifically, the ground air drilling equipment conveys gas to the bottom of a well through a drill string, high-speed gas flow enters the gas inlet channel 101, the gas is flushed out of the gas outlet hole through the gas distribution channel 201, and rock debris is carried to return to the ground from an annular space, so that the purposes of carrying rock and cleaning the bottom of the well are achieved. In the process that the airflow enters the gas distribution channel 201 from the gas inlet channel 101, because the sectional areas of the gas distribution channel and the gas inlet channel are different, pressure difference is generated, the speed of the original high-speed flowing gas is further increased, the shaft bottom cleaning is facilitated, and the gas drilling efficiency is improved. At the same time, the high-speed air flow passing through the impactor 5 in fig. 1 can drive the drill bit to move up and down and cut the rock. The gas delivered by the surface air drilling equipment can be gas commonly used in the gas drilling industry, such as air, nitrogen and the like, and besides a gas medium, a gas-liquid mixture (such as foam) can also be used as a medium.
Further, the included angle between the gas distribution channel 201 and the central axis of the compacted wall drill in the same direction is 35-45 °, for example, the included angle may be 35 °, 40 ° or 45 °.
In the exemplary embodiment, the joint may be provided with threads to facilitate attachment and detachment of the impactor.
In the present exemplary embodiment, the multi-step annular step of the step body may include 7 to 11 steps, for example, the step body may include 7 steps, 9 steps, or 11 steps.
The smaller the step number of the step body is, the larger the end area of the foremost end of the compacted wall-fixing drill bit is, the closer the shape is to the 'flat-bottom pile', and the slower the drilling speed is. The more the step number of the step body is, the closer the shape of the compacted wall-fixing drill bit is to the conical drill bit, and the drilling efficiency is reduced. The soil body is damaged under the micro-shearing action of each layer of steps by analyzing the soil squeezing mechanism of the drill bit. When the number of steps is small, the length of each step is large, and the crushing area is small under the same external force action, so that the soil body nearby can not be completely damaged. When the number of the steps is large, the crushing area of each layer of the steps is larger than that of the soil body contacted with the steps, the crushing areas are overlapped, impact energy is wasted, and the compaction effect is relatively reduced. Therefore, there should be an optimum number of steps to maximize the rate of penetration.
In order to obtain the optimal step number, numerical simulation is carried out, and drill bits with the step numbers of 3, 5, 7, 9, 11, 13 and 15 are respectively taken for analysis and simulation. Under the same impact load and other conditions, through ANSYS preliminary simulation calculation, the bar charts of the axial displacement and the radial displacement of the drill bit with different step levels are obtained. For comparative analysis, the axial and radial displacements were greatest for a 9 step drill, and thus, 9 was the best step.
In the present exemplary embodiment, the diameter of each step of the multi-step annular steps of the step body may be equal to the difference in the diameters of the steps of the adjacent layers, that is, the width of each step is the same.
The working process of the compaction wall-fixing drill bit comprises the following steps:
when gas drilling is carried out, the drill bit is driven by the impactor to impact the stratum. The stratum is impacted and sheared and damaged by the step body at the front end of the drill bit and the cutting teeth on the surface of the step body, rock debris is driven to move by pressure generated by the difference between the sectional areas of the gas distribution channel and the gas inlet channel, the rock debris is extruded to the periphery by the step body, and the well wall is further compacted and smoothed by the circular table body. The concave body can be used for secondary compaction and wall fixation in the process of drilling.
A second exemplary embodiment of the present invention provides a well tool that may include a compacted solid-wall drill bit as described above with respect to the first exemplary embodiment.
In summary, the advantages proposed by the present invention include at least one of the following:
(1) the compaction wall-fixing drill bit provided by the invention is provided with the concave body, and can generate a secondary compaction effect on the hole wall to achieve a wall-fixing effect;
(2) the compaction wall-fixing drill bit provided by the invention can ensure that gas drilling can be smoothly carried out under the condition of a complex stratum;
(3) the compaction wall-fixing drill bit provided by the invention is provided with the step body and the round table body, can compact and fix the wall of a soil body, further expands the application range of a gas drilling technology, and improves the drilling footage and speed of the gas drilling;
(4) the compaction wall-fixing drill bit provided by the invention can improve the gas drilling operation efficiency and shorten the operation period.
While a compacted wall drill bit and drilling tool of the present invention have been described above in connection with exemplary embodiments thereof, it will be apparent to those skilled in the art that various modifications and changes may be made to the exemplary embodiments of the invention without departing from the spirit and scope of the invention as defined in the following claims.
Claims (10)
1. A compaction wall-fixing drill bit is characterized by comprising a joint, a concave body, a round table body and a step body which are sequentially connected, wherein,
the step body comprises a plurality of stages of annular steps which are coaxially arranged, the diameter of the step body is gradually increased from top to bottom, and the step body can squeeze rock debris to the periphery to compact a well wall in the drilling process;
the circular truncated cone body is a trapezoidal circular truncated cone, the diameter of the circular truncated cone body is gradually increased from top to bottom, the diameter of the upper end of the circular truncated cone body is the same as that of the lower end of the step body, and the circular truncated cone body can further compact and smooth a well wall;
from top to bottom, the diameter of the concave body is gradually reduced, the diameter of the upper end of the concave body is the same as that of the lower end of the truncated cone body, and the concave body can perform a secondary compaction effect on the hole wall in the drilling process;
the joint is arranged at the lower end of the concave body to be connected with an impactor.
2. The compacted wall bit of claim 1, wherein the step body has cutting teeth disposed on a surface thereof, the cutting teeth being capable of impinging, shearing, and breaking a formation.
3. The compacted wall drill bit of claim 1, wherein an air inlet passage is provided in the interior of the joint in the direction of the central axis, the air inlet passage extending up to the interior of the female body.
4. The compacted wall-fixing drill bit as claimed in claim 3, wherein a plurality of exhaust holes are symmetrically arranged on the surface of the step body in the circumferential direction, the total sectional area of the exhaust holes is smaller than that of the air inlet channel, and the ratio of the total sectional area of all the exhaust holes to the sectional area of the air inlet channel is 30: 35-32: 33.
5. The compacted wall-fixing drill bit as claimed in claim 4, wherein an air distribution channel communicated with the air inlet channel is arranged in the concave body, and the air distribution channel penetrates through the circular truncated cone body and extends to the surface of the step body and is correspondingly connected with the exhaust hole.
6. The compacted wall drill bit as claimed in claim 5, wherein the gas distribution channel is provided with a plurality of gas distribution channels, the diameter of the gas distribution channels is smaller than that of the gas inlet channel, and the included angle between the gas distribution channel in the same direction and the central axis of the compacted wall drill bit is 35-45 degrees.
7. The compacted wall bit of claim 1, wherein the joint is threaded to connect to an impactor.
8. The compacted wall bit of claim 1, wherein the multi-stage annular step comprises 7-11 stages.
9. The compacted wall bit of claim 1, wherein the diameter of each step of the plurality of annular steps is the same as the difference between the diameters of the steps of adjacent layers.
10. A drilling tool comprising a compacted solid-wall drill bit according to any of claims 1 to 9.
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| CN202210937018.9A CN115110898A (en) | 2022-08-05 | 2022-08-05 | Compaction wall-fixing drill bit and drilling tool |
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| Application Number | Priority Date | Filing Date | Title |
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| CN202210937018.9A CN115110898A (en) | 2022-08-05 | 2022-08-05 | Compaction wall-fixing drill bit and drilling tool |
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| CN202210937018.9A Pending CN115110898A (en) | 2022-08-05 | 2022-08-05 | Compaction wall-fixing drill bit and drilling tool |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN117948045A (en) * | 2024-03-27 | 2024-04-30 | 山东省煤田地质局第四勘探队 | Reversible double-tube coring bit for tunnel complex stratum |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN117948045A (en) * | 2024-03-27 | 2024-04-30 | 山东省煤田地质局第四勘探队 | Reversible double-tube coring bit for tunnel complex stratum |
| CN117948045B (en) * | 2024-03-27 | 2024-06-11 | 山东省煤田地质局第四勘探队 | Reversible double-tube coring bit for tunnel complex stratum |
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