CN110748298B - Reamer with self-righting guide function - Google Patents
Reamer with self-righting guide function Download PDFInfo
- Publication number
- CN110748298B CN110748298B CN201911118950.3A CN201911118950A CN110748298B CN 110748298 B CN110748298 B CN 110748298B CN 201911118950 A CN201911118950 A CN 201911118950A CN 110748298 B CN110748298 B CN 110748298B
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- Prior art keywords
- righting
- cone
- barrel
- reamer
- base
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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
- E21B7/00—Special methods or apparatus for drilling
- E21B7/28—Enlarging drilled holes, e.g. by counterboring
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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
- E21B10/26—Drill bits with leading portion, i.e. drill bits with a pilot cutter; Drill bits for enlarging the borehole, e.g. reamers
- E21B10/32—Drill bits with leading portion, i.e. drill bits with a pilot cutter; Drill bits for enlarging the borehole, e.g. reamers with expansible cutting tools
- E21B10/34—Drill bits with leading portion, i.e. drill bits with a pilot cutter; Drill bits for enlarging the borehole, e.g. reamers with expansible cutting tools of roller-cutter type
- E21B10/345—Drill bits with leading portion, i.e. drill bits with a pilot cutter; Drill bits for enlarging the borehole, e.g. reamers with expansible cutting tools of roller-cutter type cutter shifted by fluid pressure
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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
- E21B17/00—Drilling rods or pipes; Flexible drill strings; Kellies; Drill collars; Sucker rods; Cables; Casings; Tubings
- E21B17/10—Wear protectors; Centralising devices, e.g. stabilisers
- E21B17/1078—Stabilisers or centralisers for casing, tubing or drill pipes
Abstract
The invention provides a reamer with a self-righting guide function, which comprises a main shaft, a plurality of cones, a plurality of righting ribs, one or a plurality of cone reinforcing ribs, a base and a righting barrel, wherein the base and the righting barrel are sequentially sleeved and fixed on the main shaft, the main shaft comprises a first medium flow channel, a second medium flow channel and a shaft body, and the base is provided with an inner cavity, a plurality of cone seats and third medium flow channels, the number of which is equal to that of the plurality of cone seats. The plurality of cones are fixedly arranged on the plurality of cone seats, and the one or more cone reinforcing ribs are arranged on the right side of the base and can connect the base or each cone with the shaft body of the spindle; the righting barrel is fixedly connected with the left side of the base and part of the shaft body of the main shaft in a sealing manner to form a gas cavity which can be inflated to generate buoyancy; the plurality of righting ribs are respectively arranged on the outer barrel wall of the righting barrel. The reamer has the advantages of simple structure, self-righting and guiding functions, reduction of fracture risks of the drill rod and the like.
Description
Technical Field
The invention relates to large-scale long-distance pipeline directional drilling and crossing construction in oil-gas field oil-gas pipeline ground construction, and belongs to the technical field of drilling or drilling engineering. And more particularly, to a reamer having a self-righting guide function.
Background
At present, because the horizontal directional drill mainly passes through a stratum within 30m from the ground, the stratum passing through is broken and complicated, particularly, weathered or completely weathered strata are mostly used in an earth entering section and an earth leaving section close to the ground, and difficulty is brought to an underreamer and a hole expanding process. However, the construction requirements of the existing horizontal directional drill are continuously increased, the directional drill with the diameter of 1000mm or more is more and more, and the requirements on the reamer are also continuously increased.
When common large-scale directional drilling reaming, current major diameter enlarger is great because of self weight, has the tenesmus trend during the reaming, especially brings bigger influence to the shape of pore when carrying out multistage reaming, and the pore-forming shape is mostly big pear shape hole about, and pore-forming quality is unfavorable for the pipeline and returns to drag, seriously influences to returning to drag success rate and pipeline anticorrosive coating, especially to soft geology such as sand bed, mudstone, forms pear shape hole trend and just more obvious. Meanwhile, the reamer does not have a self-righting guide function, and a centralizer is required to be additionally arranged to righting and guiding the reamer along the axial lead direction of the hole. However, the addition of centralizers increases the weight of the connection and the drill rod in the hole, increasing the risk of drill rod breakage.
Disclosure of Invention
The present invention aims to address at least one of the above-mentioned deficiencies of the prior art.
For example, an object of the present invention is to provide a reamer having a self-centering guide function, which can solve the problem that a large-diameter reamer is apt to form irregular holes (e.g., pear-shaped holes) due to dropping during the hole forming process. Another object of the present invention is to provide a reamer having a self-righting guide function, which does not require a centralizer and a connection structure, and in which a drill rod is not easily broken. The invention further aims to provide the reamer which can be suitable for the stratum with the depth within 30m and the target hole diameter of 1050mm or even more than 1200 mm.
In order to achieve the above purpose, the present invention provides a reamer with a self-righting guide function, which includes a main shaft, a plurality of cones, a plurality of righting ribs, one or a plurality of cone reinforcing ribs, and a base and a righting barrel which are sequentially fixed on the main shaft in a sleeving manner, wherein the main shaft includes a first medium flow channel, a second medium flow channel and a shaft body, the shaft body has a left end for connecting with an upstream drill rod and a right end for connecting with a downstream drilling tool, the first medium flow channel is axially arranged in the shaft body in a penetrating manner, and the second medium flow channel is arranged in the shaft body in a penetrating manner, and is crossed and communicated with the first medium flow channel;
the base is provided with an inner cavity, a plurality of cone seats and third medium flow channels, the number of the third medium flow channels is equal to that of the cone seats, the inner cavity is used for communicating the second medium flow channel of the main shaft with each third medium flow channel, and each third medium flow channel is correspondingly arranged at one cone seat in the cone seats;
each cone in the plurality of cones is fixedly arranged on one cone seat in the plurality of cone seats and can bear a reaming medium provided by a third medium flow passage corresponding to the cone seat;
the one or more cone reinforcing ribs are arranged on the right side of the base and can connect the base or each cone with the shaft body of the spindle;
the righting barrel is fixedly connected with the left side of the base and part of the shaft body of the main shaft in a sealing manner to form a gas cavity which can be inflated to generate buoyancy;
the plurality of righting ribs are respectively arranged on the outer barrel wall of the righting barrel, and the length extending directions of the plurality of righting ribs are not parallel to the axial lead of the righting barrel.
In an exemplary embodiment of the invention, the gas chamber of the righting barrel is air or nitrogen.
In an exemplary embodiment of the invention, the one or more roller cone reinforcing ribs are of a cone-like barrel structure, and the small end and the large end of the cone-like barrel structure are respectively and sequentially fixedly connected with the shaft body of the main shaft and the right side of the base in a sealing manner to form an air cavity capable of inflating and generating buoyancy.
In an exemplary embodiment of the invention, the air cavity of the cone-like barrel structure is air or nitrogen.
In an exemplary embodiment of the invention, the gas cavity of the righting barrel is sized according to the diameter of the counterbore and the buoyancy required.
In an exemplary embodiment of the invention, the diameter of the righting barrel is 300-1500 mm, the diameter of the main shaft is 150-240 mm, the diameter of the base is equivalent to 300-1400 mm, and the diameter of the hole formed by the reamer is 400-1800 mm.
In an exemplary embodiment of the invention, the length of the righting barrel is 500-1200 mm, the length of the main shaft is 1300-2500 mm, and the thickness of the base is 100-300 mm.
In an exemplary embodiment of the invention, the reamer is capable of guiding the reamer along the forward bore to be reamed by means of righting the outer barrel wall of the barrel and/or the contact of the plurality of righting ribs with the inner wall of the bore.
In an exemplary embodiment of the invention, the plurality of cone seats of the base are uniformly circumferentially arranged.
In an exemplary embodiment of the present invention, the plurality of cutter reinforcing ribs are uniformly arranged in a circumferential direction.
Drawings
FIG. 1 illustrates a diagram of a pear-shaped tunnel formed using a prior art reamer;
figure 2 illustrates a schematic structural view of an exemplary embodiment of a reamer having self-righting guide functionality in accordance with the present invention;
FIG. 3 shows a schematic structural view of the righting barrel cavity of FIG. 2;
FIG. 4 illustrates a pictorial view of an exemplary embodiment of a reamer having self-righting guide functionality in accordance with the present invention;
fig. 5 illustrates a circular tunnel formed using the underreamer of fig. 4.
Reference numerals:
the drilling machine comprises a main shaft 1, a centering barrel 2, a centering rib 3, a cone 4, a base 5, a cone reinforcing rib 6, a self-floating positioning guide part A, a hole forming cutting part B and a drill rod connecting part C.
Detailed Description
Hereinafter, the reamer having the self-righting guide function of the present invention will be described in detail with reference to the exemplary embodiments and the accompanying drawings. It should be noted that "first," "second," "third," 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. "left", "right", "inner" and "outer" are merely for convenience of description and to constitute relative orientations or positional relationships, and do not indicate or imply that the referenced components must have that particular orientation or position.
Figure 2 illustrates a schematic structural view of an exemplary embodiment of a reamer having self-righting guide functionality in accordance with the present invention; fig. 3 shows a schematic structural view of the cavity of the righting barrel of fig. 2.
In the present embodiment, as shown in fig. 2, the reamer having the self-centering guide function includes a main shaft 1, a plurality of cones 4, a plurality of centering ribs 3, one or more cone reinforcing ribs 6, and a base 5 and a centering barrel 2 which are sequentially fixed to the main shaft 1 in a sleeved manner.
The main shaft 1 is a cylindrical barrel. For example, the diameter of the preferred main shaft may be 150 to 240mm, and the length of the main shaft may be 1300 to 2500 mm. The left end of the main shaft 1 is fixedly connected with an upstream drill rod so as to transmit the rotating torque generated by the upstream drill rod. For example, the left end of the main shaft may be a threaded structure, and a corresponding threaded fixed connection on the upstream drill rod rotates with the upstream drill rod. The right end of the main shaft 1 is used for being connected with a downstream drilling tool, and the right end of the main shaft 1 can be of a threaded structure.
The main shaft 1 is internally provided with a first medium flow passage for the flowing of a hole expanding medium, namely a hollow passage in the main shaft 1, and the first medium flow passage penetrates through the whole main shaft 1. And an opening is formed in the shaft body of the main shaft 1, and the opening is communicated with the first medium flow channel to form a second medium flow channel. Here, the first medium flow passage axial direction and the second medium flow passage axial direction intersect with each other, and the reaming medium from the upstream drill rod can enter the second medium flow passage through the first medium flow passage. Preferably, the first medium flow passage axial direction may be perpendicular to the second medium flow passage axial direction.
Each cone 4 in the plurality of cones 4 is fixedly arranged on a corresponding cone seat on the base 5, and a reaming medium from an upstream drill rod sequentially passes through the first medium flow channel, the second medium flow channel, the inner cavity structure of the base 5 and the third medium flow channel and then is sprayed on each cone 4 to lubricate each cone 4 in the reaming process. For example, the preferred number of cone blocks may be 4 to 12, and the diameter of the counterbore may be 400 to 1800mm, such as 1100mm, 1500mm, etc. Here, the connection manner of the cone and the cone seat may be welding. However, the present invention is not limited thereto as long as the fixed mounting of the base and the cone is achieved.
The roller cone reinforcing ribs 6 are arranged on the right side of the base 5, can act on the end face of the right side of the base 5 to fixedly connect the base 5 with the shaft body of the spindle 1, and can also directly act on each roller cone 4 to fixedly connect each roller cone 4 with the shaft body of the spindle 1. Here, the roller cone reinforcing rib may be an integral cone-like structure, or may be a plurality of cone-like structures composed of a single part. The big end of cone strengthening rib class toper structure is connected with base right side terminal surface fixed seal, and the little one end of class toper structure is connected with main shaft axle body fixed seal to form sealed air cavity between cone strengthening rib, base and main shaft axle body. The air cavity can be air or nitrogen, and can generate buoyancy in mud during reaming to offset partial gravity borne by the reamer. The connection mode of the cone reinforcing rib and the base or the cone and the connection mode of the cone reinforcing rib and the main shaft can be welding, and the cone reinforcing rib enables the cone to keep rigidity in the reaming process, so that damage of the reamer is avoided. However, the present invention is not limited thereto and the roller cone reinforcing ribs may have other shapes as long as the strength of the roller cone can be increased.
In this embodiment, as shown in fig. 3, the righting barrel 2 is a cylinder with a conical end, the left end of the cavity of the righting barrel 2 is in a conical structure, and the top of the conical structure is provided with an opening connected with the spindle body; the right end of the cavity is of a cylindrical structure, and one end of the conical structure, which is not the conical top, is fixedly and hermetically connected with the opening of the cylindrical structure at the right end. Righting 2 right-hand members cylinders of bucket and the left end face sealing fixed connection of base 5, righting 2 left-hand members of bucket circular cone opening and main shaft 1's partial axle body sealing fixed connection for form sealed gas chamber between 1 axle body outside of main shaft, the 2 cavity insides of bucket of righting and the 5 left end faces of base, this gas chamber can make the bucket of righting produce buoyancy in mud and offset the partial gravity that receives the reamer. Meanwhile, the size of the gas cavity of the righting barrel can be determined according to the diameter of the reamed hole of the reamer and the required buoyancy. Preferably, the diameter of the righting barrel can be 300-1500 mm, such as 1100mm, 1350mm and the like, the length of the righting barrel can be 500-1200 mm, and the gas in the gas cavity of the righting barrel can be air or nitrogen. Here, the connection mode of the centering barrel and the base and the connection mode of the centering barrel and the main shaft may be welding. However, the invention is not limited thereto and the righting barrel may be of other shapes as long as it forms a sealed gas chamber that can be inflated and creates buoyancy in the slurry.
In addition, the outer barrel wall of the righting barrel can be provided with a plurality of righting ribs, and the length extending directions of the plurality of righting ribs and the axial lead of the righting barrel are arranged in a cross way and form a certain angle. Here, through setting up a plurality of muscle of righting and right the muscle length extending direction and right barrel axial lead nonparallel setting, can make the mud sediment of discharge duct the place ahead siltation of angle that the reamer utilized the muscle of righting better in the reaming process. During reaming, the left end of the reamer is firstly contacted with the inner wall of the hole channel finished at the previous stage, and the reamer is guided to move forward along the hole channel to be reamed by utilizing the contact between the outer barrel wall of the centering barrel and the inner wall of the hole channel or the contact between a plurality of centering ribs and the inner wall of the hole channel. Meanwhile, the rear end cone wheel part is contacted with the channel to be reamed and then the channel is cut to form the channel to be reamed at the stage. The reamer can be guided to advance along the front hole channel to be reamed by the contact of the outer barrel wall of the centering barrel and the plurality of centering ribs with the inner wall of the hole channel, and the hole channel to be reamed is cut simultaneously by the rear end cone part to form the hole channel to be reamed at the current stage. Here, the muscle of righting can be the cuboid structure of compriseing upper and lower two parts, cuboid upper portion is solid and the surface has the line, and the cuboid lower part is hollow structure and can form little cavity with righting the bucket outer wall, and this little cavity also can play the effect that produces buoyancy and right in mud. For example, the connection mode of the strengthening rib and the strengthening barrel may be welding, however, the invention is not limited thereto, and the strengthening rib may have other shapes as long as the connection of the strengthening rib and the strengthening barrel can be realized and the strengthening function is provided.
Fig. 4 illustrates a pictorial view of an exemplary embodiment of a reamer having self-righting guide functionality in accordance with the present invention.
In the present embodiment, as shown in fig. 4, a denotes a self-floating positioning guide portion, which is constituted by a righting bucket 2 and a plurality of righting ribs 3; b denotes a reaming cutting portion composed of a base 5 and a plurality of cones 4; c denotes a drill rod connection part, which is constituted by the main shaft 1, the drill rods being connected mainly by means of a screw connection.
Figure 1 shows a diagram of a pear-shaped tunnel formed using a prior art reamer. As shown in fig. 1, in the process of forming a hole, a pear-shaped hole passage is formed in the hole due to the excessive weight of the existing reamer, which affects the quality of the formed hole, and the plough-shaped hole passage brings a great hidden trouble to the dragging of the pipeline. Fig. 5 illustrates a circular tunnel formed using the underreamer of fig. 4. As shown in fig. 5, the hole drilled by the reamer with the self-righting guide function of the invention has a significantly improved pear-shaped trend compared with the hole drilled by the conventional reamer in fig. 1, which shows that the reamer has a better self-righting guide function. In addition, the reamer with the self-righting guide function does not need to be additionally provided with a guide righting device to righting the reamer in the hole along the direction of the axial lead of the hole, so that the connecting structure with the additional righting guide device is reduced, and the risk of breakage in the reaming process of the drill rod is reduced.
When reaming is carried out, the upstream drill rod drives the main shaft 1 to rotate, the main shaft 1 drives the centering barrel 2, the centering rib 3, the base 5, the base reinforcing rib 6 and the cone 4 which are connected with the main shaft to rotate together in a hole channel for reaming, and a reaming medium from the upstream drill rod enters an inner cavity of the base 5 through the first medium flow channel in the main shaft 1, flows out of the reamer through the third medium flow channel and is sprayed on the cone 4 to assist the reamer in reaming.
In summary, the reamer with the self-righting guide function of the present invention has the following advantages:
1. compared with the prior similar caliber reamer (particularly a rock reamer), the weight of the reamer can be effectively reduced by 30 percent. The problem that pear-shaped holes are formed in the existing reamer due to the fact that the weight of the existing reamer is too large is effectively solved;
2. the reamer has a self-righting guide function, a righting guide device does not need to be additionally arranged, a primary connecting structure is reduced, and the fracture risk of a drilling tool is reduced;
3. the reamer is flexible in structural form, can be applied to hole forming operation of soft strata such as silt and the like or hard strata such as rock and the like after the cutting part is properly optimized and modified, and is wide in application range.
Although the present invention has been described above in connection with the exemplary embodiments and the accompanying drawings, it will be apparent to those of ordinary skill in the art that various modifications may be made to the above-described embodiments without departing from the spirit and scope of the claims.
Claims (7)
1. The reamer with the self-righting guide function is characterized by comprising a main shaft, a plurality of cones, a plurality of righting ribs, one or a plurality of cone reinforcing ribs, a base and a righting barrel, wherein the base and the righting barrel are sequentially sleeved and fixed on the main shaft,
the main shaft comprises a first medium flow passage, a second medium flow passage and a shaft body, the shaft body is provided with a left end used for being connected with an upstream drill rod and a right end used for being connected with a downstream drilling tool, the first medium flow passage is arranged in the shaft body in a penetrating mode along the axial direction, and the second medium flow passage is arranged in the shaft body in a penetrating mode and is crossed and communicated with the first medium flow passage;
the base is provided with an inner cavity, a plurality of cone seats and third medium flow channels, the number of the third medium flow channels is equal to that of the cone seats, the inner cavity is used for communicating the second medium flow channel of the main shaft with each third medium flow channel, and each third medium flow channel is correspondingly arranged at one cone seat in the cone seats;
each cone in the plurality of cones is fixedly arranged on one cone seat in the plurality of cone seats and can bear a reaming medium provided by a third medium flow passage corresponding to the cone seat;
the one or more cone reinforcing ribs are arranged on the right side of the base and can connect the base or each cone with the shaft body of the main shaft, the one or more cone reinforcing ribs are of cone-like barrel structures, and the small ends and the large ends of the cone-like barrel structures are respectively and sequentially fixedly connected with the shaft body of the main shaft and the right side of the base in a sealing manner so as to form an air cavity which can be inflated and can generate buoyancy;
the righting barrel is fixedly connected with the left side of the base and part of the shaft body of the main shaft in a sealing manner to form a gas cavity which can be inflated to generate buoyancy;
the gas cavity of the centering barrel is filled with air or nitrogen, the gas cavity of the cone-like barrel structure is filled with air or nitrogen, and the gas cavity of the centering barrel and the gas cavity of the cone-like barrel structure can generate buoyancy in slurry during reaming to offset partial gravity borne by the reamer;
the plurality of righting ribs are respectively arranged on the outer barrel wall of the righting barrel, and the length extending directions of the plurality of righting ribs are not parallel to the axial lead of the righting barrel; the strengthening rib is of a cuboid structure consisting of an upper part and a lower part, the upper part of the cuboid is solid, the outer surface of the cuboid is provided with grains, and the lower part of the cuboid is of a hollow structure and can form a small cavity with the outer wall surface of the strengthening barrel;
when the reamer is used for reaming, the pear-shaped trend is improved, and pear-shaped holes can be prevented from being formed.
2. The reamer with self-righting guide function of claim 1, wherein the gas cavity of the righting barrel is sized according to the diameter of the reamer and the buoyancy required.
3. The reamer with the self-righting guide function as claimed in claim 1, wherein the righting barrel is 300-1500 mm in diameter, the spindle is 150-240 mm in diameter, the base is 300-1400 mm in diameter, and the reamer bore is 400-1800 mm in diameter.
4. The reamer with the self-righting guide function of claim 1, wherein the righting barrel length is 500-1200 mm, the spindle length is 1300-2500 mm, and the base thickness is equivalently 100-300 mm.
5. The reamer with the self-centering guide function of claim 1, wherein the reamer is capable of guiding the reamer along a forward bore to be reamed by utilizing the contact of the centering barrel outer barrel wall and/or the plurality of centering ribs with the bore inner wall.
6. The reamer of claim 1, wherein the plurality of roller cone seats of the base are circumferentially and uniformly distributed.
7. The reamer with the self-righting guide function of claim 1, wherein the plurality of cutter reinforcing ribs are uniformly arranged in a circumferential direction.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201911118950.3A CN110748298B (en) | 2019-11-15 | 2019-11-15 | Reamer with self-righting guide function |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201911118950.3A CN110748298B (en) | 2019-11-15 | 2019-11-15 | Reamer with self-righting guide function |
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| CN110748298A CN110748298A (en) | 2020-02-04 |
| CN110748298B true CN110748298B (en) | 2022-03-18 |
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| CN201911118950.3A Active CN110748298B (en) | 2019-11-15 | 2019-11-15 | Reamer with self-righting guide function |
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Families Citing this family (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111350461B (en) * | 2020-05-09 | 2020-12-15 | 安徽建筑大学 | Reaming device for horizontal directional drilling |
| CN113445926B (en) * | 2021-07-07 | 2023-01-24 | 广东电网能源发展有限公司 | Rock breaking drill bit device |
| CN113882807A (en) * | 2021-09-30 | 2022-01-04 | 徐州徐工基础工程机械有限公司 | Buoyancy reamer for horizontal directional drill |
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| AU611534B2 (en) * | 1988-02-29 | 1991-06-13 | Baker Hughes Incorporated | Flow through raise boring bit |
| CN1280646A (en) * | 1997-10-15 | 2001-01-17 | Se股份有限公司 | Directional drilling tool |
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| CN1469964A (en) * | 2000-10-12 | 2004-01-21 | �����ĵ� | A drilling tool used in horizontal drilling applications |
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| CN207160982U (en) * | 2017-09-05 | 2018-03-30 | 天津博为中天钻具有限公司 | A kind of gear wheel flow channel type reamer |
| CN209724223U (en) * | 2019-02-28 | 2019-12-03 | 辽河石油勘探局有限公司 | A kind of horizontal directional drill forward direction reamer |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US9995084B1 (en) * | 2015-08-07 | 2018-06-12 | Cary Cooper | Hammer reamer for expanding a pilot bore |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4228863A (en) * | 1977-09-09 | 1980-10-21 | Sandvik Aktiebolag | Reamer bit for raise boring |
| DE3114927A1 (en) * | 1980-05-30 | 1982-02-25 | Sandvik AB, 81181 Sandviken | Method and apparatus for ground boring |
| AU611534B2 (en) * | 1988-02-29 | 1991-06-13 | Baker Hughes Incorporated | Flow through raise boring bit |
| CN1280646A (en) * | 1997-10-15 | 2001-01-17 | Se股份有限公司 | Directional drilling tool |
| CN1469964A (en) * | 2000-10-12 | 2004-01-21 | �����ĵ� | A drilling tool used in horizontal drilling applications |
| CN2544085Y (en) * | 2001-10-26 | 2003-04-09 | 辽河石油勘探局工程技术研究院 | Downhole large diameter reamer |
| CN201679444U (en) * | 2009-08-05 | 2010-12-22 | 中国石油天然气管道局 | Low torque reamer |
| HK1198796A2 (en) * | 2015-01-13 | 2015-06-05 | 振華發展有限公司 | Modular drilling reamer |
| CN207160982U (en) * | 2017-09-05 | 2018-03-30 | 天津博为中天钻具有限公司 | A kind of gear wheel flow channel type reamer |
| CN209724223U (en) * | 2019-02-28 | 2019-12-03 | 辽河石油勘探局有限公司 | A kind of horizontal directional drill forward direction reamer |
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| CN110748298A (en) | 2020-02-04 |
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