CN105781443A - Variable-diameter centering device - Google Patents
Variable-diameter centering device Download PDFInfo
- Publication number
- CN105781443A CN105781443A CN201610282591.5A CN201610282591A CN105781443A CN 105781443 A CN105781443 A CN 105781443A CN 201610282591 A CN201610282591 A CN 201610282591A CN 105781443 A CN105781443 A CN 105781443A
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- section
- center tubes
- reducing centralizer
- axially
- lateral surface
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- 208000036829 Device dislocation Diseases 0.000 claims description 2
- 230000001788 irregular Effects 0.000 abstract description 6
- 230000007547 defect Effects 0.000 abstract description 3
- 230000000694 effects Effects 0.000 description 8
- 230000006835 compression Effects 0.000 description 2
- 238000007906 compression Methods 0.000 description 2
- 206010018325 Congenital glaucomas Diseases 0.000 description 1
- 206010012565 Developmental glaucoma Diseases 0.000 description 1
- 208000007157 Hydrophthalmos Diseases 0.000 description 1
- 229910000831 Steel Inorganic materials 0.000 description 1
- 201000001024 buphthalmos Diseases 0.000 description 1
- 239000011083 cement mortar Substances 0.000 description 1
- 238000010276 construction Methods 0.000 description 1
- 238000006073 displacement reaction Methods 0.000 description 1
- 238000005553 drilling Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 230000008014 freezing Effects 0.000 description 1
- 238000007710 freezing Methods 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 239000010959 steel Substances 0.000 description 1
Classifications
-
- E—FIXED CONSTRUCTIONS
- E21—EARTH OR ROCK DRILLING; MINING
- E21B—EARTH OR ROCK DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
- 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
- E21B17/1014—Flexible or expansible centering means, e.g. with pistons pressing against the wall of the well
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- Engineering & Computer Science (AREA)
- Life Sciences & Earth Sciences (AREA)
- Geology (AREA)
- Mining & Mineral Resources (AREA)
- Mechanical Engineering (AREA)
- Physics & Mathematics (AREA)
- Environmental & Geological Engineering (AREA)
- Fluid Mechanics (AREA)
- General Life Sciences & Earth Sciences (AREA)
- Geochemistry & Mineralogy (AREA)
- Earth Drilling (AREA)
Abstract
The invention provides a variable-diameter centering device. The variable-diameter centering device comprises a central pipe body, a plurality of centering strips, radial elastic distance adjusting devices and elastic limiting devices; the centering strips are uniformly arranged on the outside surface of the central pipe body in a circumferential direction; each centering strip comprises an axial sliding section, an upper connecting section, a well wall contact section and a lower connecting section which are hinged in sequence from top to bottom; each lower connecting section is hinged to the central pipe body; each radial elastic distance adjusting device is connected between the corresponding well wall contact section and the outside surface of the central pipe body; each elastic limiting device is arranged on the central pipe body in a sleeving manner and is in contact with the outer side of the corresponding axial sliding section. The variable-diameter centering device provided by the invention can centre according to the change of a well diameter, and is particularly suitable for an irregular well hole of a diameter-shrunk or pot-bellied well section; defects in the prior art are overcome.
Description
Technical field
The invention belongs to oil gas drilling technical field, in particular it relates to a kind of reducing centralizer, can be used for existing in the irregular borehole of undergauge or pregnant well section.
Background technology
Using casing stabbing board is the effective measures improving cementing quality, and casing stabbing board can effectively make casing centralization, effectively overcomes the problem that groove altered by cement mortar, moreover it is possible to reduce the danger of sleeve pipe pressure difference bit freezing.Existing casing stabbing board is generally rigid centralizer, in being generally used for not having undergauge or being absent from the regular well of pregnant well section.In the irregular borehole of undergauge or pregnant well section, owing to hole diameter footpath changes, no matter use rigid centralizers many again that sleeve pipe all can not be made to reach the centralizer of requirement.
In view of this, the present inventor, according to the production design experiences being engaged in this area and association area for many years, develops a kind of reducing centralizer, to solving prior art Problems existing.
Summary of the invention
It is an object of the invention to be in that to provide a kind of reducing centralizer, righting can be carried out according to well radius variations, be specially adapted in the irregular borehole of undergauge or pregnant well section, overcome the defect of prior art.
For this, the present invention proposes a kind of reducing centralizer, and it includes:
Center tubes；
Multiple righting strips, the lateral surface being arranged on described center tubes being evenly distributed, described righting strip includes the section of sliding axially hinged successively from top to bottom, upper linkage section, borehole wall contact-segment and lower linkage section, and described lower linkage section and described center tubes are hinged；
Radial elastic roll-setting gear, is connected between described borehole wall contact-segment and the lateral surface of described central canal；
Elastic limit device, is set on described central canal, and with each described in the outside of the section of sliding axially contact.
Reducing centralizer as above, wherein, described radial elastic roll-setting gear is provided with a radial spring, and the inner correspondence of described radial spring is embedded in the location circular groove that described center tubes lateral surface is formed, and its outer end is connected with described borehole wall contact-segment.
Reducing centralizer as above, wherein, described radial elastic roll-setting gear separately includes a radial spring and stably overlaps, described radial spring is stably set in the outside of described radial spring, its the inner is embedded in the circular groove of described location, and the length stably overlapped of described radial spring is less than the length of described radial spring.
Reducing centralizer as above, wherein, described elastic limit device includes an axle spring and a spacing ring, and described axle spring and spacing ring are from top to bottom sequentially sleeved on described central canal, and with each described in the outside of the section of sliding axially contact.
Reducing centralizer as above, wherein, described spacing ring is close to the hinged place of the described section of sliding axially Yu described upper linkage section.
Reducing centralizer as above, wherein, be additionally provided with one can guide described in the section of sliding axially along the axially guiding device moved axially of described central canal, described axially guiding device be installed in described between the section of sliding axially and the lateral surface of described central canal.
Reducing centralizer as above, wherein, described axially guiding device includes the first multi-directional ball and the axial slideway of a recessed lateral surface in described center tubes, described first multi-directional ball be arranged on described in the section of sliding axially, its mobile correspondence is embedded at described axial slideway place.
Reducing centralizer as above, wherein, described radial elastic roll-setting gear is provided with two, and along axially-spaced being arranged between described borehole wall contact-segment and described center tubes of described center tubes.
Reducing centralizer as above, wherein, described center tubes is provided with an ear at the lateral surface near its lower end corresponding to described lower linkage section, passes through to wear a bearing pin and be hinged between lower end and the described ear of described lower linkage section.
Reducing centralizer as above, wherein, the lateral surface of described borehole wall contact-segment is provided with at least two second multi-directional ball, and the second multi-directional ball described in two is arranged along the length direction interval of described borehole wall contact-segment.
Reducing centralizer as above, wherein, described reducing centralizer is set on sleeve by described central canal physical ability, described sleeve pipe is being socketed with a upper limit hoop close to the upper end correspondence of described center tubes, the upper end of described upper limit hoop and described elastic limit device abuts against, the lower end that described sleeve pipe is socketed with spacing hoop, described lower limit hoop and described center tubes at the lower end adjacent to described center tubes abuts against.
The reducing centralizer that the present invention proposes, include center tubes, righting strip, radial elastic roll-setting gear and elastic limit device, utilize each righting strip by hinged construction features, under the cooperation of radial elastic roll-setting gear, can according to real well wall-like condition, freely convert external diameter, thus improve the adaptability to different operating modes and the stability of work, especially can adapt to the well radius variations of the irregular borehole of undergauge or pregnant well section to greatest extent, good righting function can be reached；It addition, the present invention is easy to use, dependable performance, by arranging the second multi-directional ball, also there is auxiliary and drop the effect of resistance, it is ensured that completion tubular column safety, quickly, enter down smoothly.
Accompanying drawing explanation
Fig. 1 is the schematic appearance of the reducing centralizer of the present invention；
Fig. 2 is the sectional view of the reducing centralizer of the present invention.
Main element label declaration:
1 center tubes 11 positions circular groove
12 ear 13 bearing pins
2 righting strip 21 sections of sliding axially
Linkage section 23 borehole wall contact-segment on 22
24 times linkage section 3 radial elastic roll-setting gears
31 radial spring 32 radial springs stably overlap
4 elastic limit device 41 axle springs
The 42 axially guiding devices of spacing ring 5
The 51 first axial slideways of multi-directional ball 52
6 second multi-directional ball 7 sleeve pipes
71 upper limit hoop 72 lower limit hoops
Detailed description of the invention
The present invention proposes a kind of reducing centralizer, and it includes: center tubes；Multiple righting strips, the lateral surface being arranged on described center tubes being evenly distributed, described righting strip includes the section of sliding axially hinged successively from top to bottom, upper linkage section, borehole wall contact-segment and lower linkage section, and described lower linkage section and described center tubes are hinged；Radial elastic roll-setting gear, is connected between described borehole wall contact-segment and the lateral surface of described central canal；Elastic limit device, is set on described central canal, and with each described in the outside of the section of sliding axially contact.The reducing centralizer of the present invention, can carry out righting according to well radius variations, is specially adapted in the irregular borehole of undergauge or pregnant well section, overcomes the defect of prior art.
In order to the technical characteristic of the present invention, purpose and effect are more clearly understood from, below in conjunction with accompanying drawing and preferred embodiment, the detailed description of the invention of reducing centralizer, structure, feature and effect that the present invention is proposed, describe in detail as after.It addition, by the explanation of detailed description of the invention, when can be reach technological means that predetermined purpose takes and effect is goed deep into concrete understanding more to the present invention, but institute's accompanying drawing be only to provide with reference to and use is described, is not used for the present invention is any limitation as.Wherein, identical parts adopt identical label.
Fig. 1 is the schematic appearance of the reducing centralizer of the present invention；Fig. 2 is the sectional view of the reducing centralizer of the present invention.
Referring to Fig. 1 and Fig. 2, the reducing centralizer that the present invention proposes, it includes center tubes 1, multiple righting strip 2, radial elastic roll-setting gear 3 and elastic limit device 4, wherein, what each described righting strip 2 was evenly distributed is arranged on the lateral surface of described center tubes 1, it is preferably provided with 4 in the drawings, described righting strip 2 includes the section of sliding axially hinged successively from top to bottom 21, upper linkage section 22, borehole wall contact-segment 23 and lower linkage section 24, and described lower linkage section 24 is hinged with described center tubes 1；Described radial elastic roll-setting gear 3 is connected between described borehole wall contact-segment 23 and the lateral surface of described central canal 1；Described elastic limit device 4 is set on described central canal 1, and with each described in the outside of the section of sliding axially 21 contact.
Wherein, described radial elastic roll-setting gear 3 is provided with a radial spring 31, and the inner correspondence of described radial spring 31 is embedded in the location circular groove 11 that described center tubes 1 lateral surface is formed, and its outer end is connected with described borehole wall contact-segment 23.When down-hole, when described righting strip 2 contacts with the borehole wall, under the contact of described radial spring 31, described borehole wall contact-segment 23 can be in close contact with the borehole wall, to carry out righting operation preferably.
nullAs shown in the figure，Described radial elastic roll-setting gear 3 separately includes a radial spring and stably overlaps 32，Described radial spring stably overlaps 32 outsides being set in described radial spring 31，Its inner is embedded in described location circular groove 11，And described radial spring stably overlaps the length of 32 length less than described radial spring 31，In other words，When free state，The length of described radial spring 31 stably overlaps the length of 32 much larger than described radial spring，So，Can ensure that described radial spring 31 also can be resisted against the borehole wall contact-segment 21 of described righting strip 2 when being stressed，To meet normal instructions for use，Additionally，32 are stably overlapped by arranging described radial spring，It is avoided that described radial spring 31 is operationally toppled over because of unbalance stress，Cause disengaging with borehole wall contact-segment 21 and ineffective.
Preferably, described elastic limit device 4 includes axle spring 41 and a spacing ring 42, described axle spring 41 and spacing ring 42 are from top to bottom sequentially sleeved on described central canal 1, and with each described in the outside of the section of sliding axially 23 contact, so that the described section of sliding axially 23 is carried out spacing, it is to avoid it drops from described center tubes 1.Further, described spacing ring 42 is close to the hinged place of the described section of sliding axially 23 with described upper linkage section 22.
Refer to Fig. 1, Fig. 2, be additionally provided with one can guide described in the section of sliding axially 21 along the axially guiding device 5 moved axially of described central canal 1, described axially guiding device 5 be installed in described between the section of sliding axially 21 and the lateral surface of described central canal 1.
Wherein, described axially guiding device 5 includes the axial slideway 52 of the first multi-directional ball 51 and a recessed lateral surface in described center tubes 1, described first multi-directional ball 51 be arranged on described in the section of sliding axially 21, its mobile correspondence is embedded at described axial slideway 52 place.As shown in FIG., it is preferable that be provided with two described first multi-directional ball 51.
In order to make described borehole wall contact-segment 23 contact with the borehole wall more closely, to reach result of use more preferably, as in figure 2 it is shown, described radial elastic roll-setting gear 3 is provided with two, and along axially-spaced being arranged between described borehole wall contact-segment 23 and described center tubes 1 of described center tubes 1.
Referring to Fig. 2, described center tubes 1 is provided with an ear 12 at the lateral surface near its lower end corresponding to described lower linkage section 24, passes through to wear a bearing pin 13 and be hinged between lower end and the described ear 12 of described lower linkage section 24.
Additionally, the lateral surface of described borehole wall contact-segment 23 is provided with at least two second multi-directional ball 6 (in figure exemplary be provided with 3), the second multi-directional ball 6 described in two is arranged along the length direction interval of described borehole wall contact-segment 23.By arranging described second multi-directional ball 6, on the one hand, can be fashionable under completion tubular column, reduce the frictional resistance of the present invention along borehole axis direction, on the other hand, it is also possible to play auxiliary and subtract torsion effect.Wherein, the support plinth of multi-directional ball, also known as universal conveyor ball, steel ball wheel and buphthalmos etc., in use, is directly installed in the borehole wall contact-segment 23 of described righting strip 2, assembles simple and convenient by multi-directional ball.
Please also refer to Fig. 1, described reducing centralizer can be set on sleeve 7 by described center tubes 1, described sleeve pipe 7 is being socketed with a upper limit hoop 71 close to the upper end correspondence of described center tubes 1, the upper end (axle spring 41 in Fig. 2) of described upper limit hoop 71 and described elastic limit device 4 abuts against, described sleeve pipe 7 is socketed with spacing hoop 72 at the lower end adjacent to described center tubes 1, the lower end of described lower limit hoop 72 and described center tubes 1 abuts against, thus, this reducing centralizer can be positioned, it is avoided to be subjected to displacement on sleeve pipe, guarantee normal righting function.Wherein, described upper limit hoop 71, lower limit hoop 72 are two semi-circular shape structures, are fixed on sleeve outer wall by coordinating with clamping screw.The reducing centralizer that the present invention proposes, it is sleeved on sleeve outer wall, thus forming completion tubular column, and, when original state, making described radial spring 31 and axle spring 41 all in a certain degree compressing, subsequently by under this completion tubular column lower going-into-well, and the second multi-directional ball 6 installed in described borehole wall contact-segment 23 can play the effect of drag reduction；
When underground work, if hole diameter is regular, described radial spring 31 is constant with the compression degree of axle spring 41；When caliper expansion (pregnant well section) or reduction (undergauge well), described radial spring 31 is released accordingly or continues compression, continue to play the effect making casing centralization, wherein, owing to each described righting strip 2 is for being separately provided, even if running into is not the circular borehole wall, each described righting strip 2 is in described radial elastic roll-setting gear 3 under the effect of radial spring 31, can also work alone, it is ensured that the centralizer of sleeve pipe.
The foregoing is only the schematic detailed description of the invention of the present invention, be not limited to the scope of the present invention.Any those skilled in the art, equivalent variations done under without departing from the design of the present invention and the premise of principle and amendment, all should belong to the scope of protection of the invention.
Claims (11)
1. a reducing centralizer, it is characterised in that described reducing centralizer includes:
Center tubes；
Multiple righting strips, the lateral surface being arranged on described center tubes being evenly distributed, described righting strip includes the section of sliding axially hinged successively from top to bottom, upper linkage section, borehole wall contact-segment and lower linkage section, and described lower linkage section and described center tubes are hinged；
Radial elastic roll-setting gear, is connected between described borehole wall contact-segment and the lateral surface of described central canal；
Elastic limit device, is set on described central canal, and with each described in the outside of the section of sliding axially contact.
2. reducing centralizer as claimed in claim 1, it is characterized in that, described radial elastic roll-setting gear is provided with a radial spring, and the inner correspondence of described radial spring is embedded in the location circular groove that described center tubes lateral surface is formed, and its outer end is connected with described borehole wall contact-segment.
3. reducing centralizer as claimed in claim 2, it is characterized in that, described radial elastic roll-setting gear separately includes a radial spring and stably overlaps, described radial spring is stably set in the outside of described radial spring, its the inner is embedded in the circular groove of described location, and the length stably overlapped of described radial spring is less than the length of described radial spring.
4. the reducing centralizer as described in claim 1 or 3, it is characterized in that, described elastic limit device includes an axle spring and a spacing ring, and described axle spring and spacing ring are from top to bottom sequentially sleeved on described central canal, and with each described in the outside of the section of sliding axially contact.
5. reducing centralizer as claimed in claim 4, it is characterised in that described spacing ring is close to the hinged place of the described section of sliding axially Yu described upper linkage section.
6. the reducing centralizer as described in claim 1 or 5, it is characterized in that, be additionally provided with one can guide described in the section of sliding axially along the axially guiding device moved axially of described central canal, described axially guiding device be installed in described between the section of sliding axially and the lateral surface of described central canal.
7. reducing centralizer as claimed in claim 6, it is characterized in that, described axially guiding device includes the first multi-directional ball and the axial slideway of a recessed lateral surface in described center tubes, described first multi-directional ball be arranged on described in the section of sliding axially, its mobile correspondence is embedded at described axial slideway place.
8. the reducing centralizer as described in claim 1 or 7, it is characterised in that described radial elastic roll-setting gear is provided with two, and along axially-spaced being arranged between described borehole wall contact-segment and described center tubes of described center tubes.
9. reducing centralizer as claimed in claim 8, it is characterised in that described center tubes is provided with an ear at the lateral surface near its lower end corresponding to described lower linkage section, passes through to wear a bearing pin and is hinged between lower end and the described ear of described lower linkage section.
10. the reducing centralizer as described in claim 1 or 9, it is characterised in that the lateral surface of described borehole wall contact-segment is provided with at least two second multi-directional ball, the second multi-directional ball described in two is arranged along the length direction interval of described borehole wall contact-segment.
11. reducing centralizer as claimed in claim 1, it is characterized in that, described reducing centralizer is set on sleeve by described central canal physical ability, described sleeve pipe is being socketed with a upper limit hoop close to the upper end correspondence of described center tubes, the upper end of described upper limit hoop and described elastic limit device abuts against, the lower end that described sleeve pipe is socketed with spacing hoop, described lower limit hoop and described center tubes at the lower end adjacent to described center tubes abuts against.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610282591.5A CN105781443B (en) | 2016-04-29 | 2016-04-29 | A kind of reducing centralizer |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610282591.5A CN105781443B (en) | 2016-04-29 | 2016-04-29 | A kind of reducing centralizer |
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| Publication Number | Publication Date |
|---|---|
| CN105781443A true CN105781443A (en) | 2016-07-20 |
| CN105781443B CN105781443B (en) | 2018-06-29 |
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| CN201610282591.5A Active CN105781443B (en) | 2016-04-29 | 2016-04-29 | A kind of reducing centralizer |
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Cited By (11)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107255018A (en) * | 2017-07-11 | 2017-10-17 | 深圳市远东石油钻采工程有限公司 | A kind of non-rotation centralizer of variable-diameter roller type |
| CN108612492A (en) * | 2016-12-12 | 2018-10-02 | 四川煜天石油机械设备有限公司 | A kind of reducing oil pipe rotary centralizer |
| CN109236278A (en) * | 2018-08-21 | 2019-01-18 | 中国石油天然气股份有限公司 | Downhole testing instrument integrated protection device |
| CN110043200A (en) * | 2019-04-22 | 2019-07-23 | 中国农业大学 | A kind of reducing centralizer of magnetic signal activation |
| CN110230474A (en) * | 2019-07-02 | 2019-09-13 | 北京长城博创科技有限公司 | Conductive centralizer |
| CN110725654A (en) * | 2019-11-30 | 2020-01-24 | 孙庆云 | Combined type sucker rod centralizer |
| CN110924876A (en) * | 2019-12-18 | 2020-03-27 | 无棣荣业网具有限公司 | A but, reducing centralizer for pneumatic drill spraying |
| CN112012671B (en) * | 2020-10-19 | 2021-01-15 | 胜利油田固邦石油装备有限责任公司 | Anti-deformation elastic sleeve centralizer |
| CN114233209A (en) * | 2021-12-18 | 2022-03-25 | 江苏航天鸿鹏数控机械有限公司 | Hydraulic diameter-variable centralizer |
| CN115405238A (en) * | 2022-10-14 | 2022-11-29 | 东营华辰石油装备有限公司 | Casing centralizer with adaptive diameter-changing function |
| CN116398062A (en) * | 2023-06-08 | 2023-07-07 | 山西国源煤层气综合利用工程技术股份有限公司 | Hydraulic control variable diameter centralizer for underground reaming |
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Cited By (17)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108612492A (en) * | 2016-12-12 | 2018-10-02 | 四川煜天石油机械设备有限公司 | A kind of reducing oil pipe rotary centralizer |
| CN107255018B (en) * | 2017-07-11 | 2023-06-06 | 深圳市远东石油钻采工程有限公司 | Variable diameter roller type non-rotating centralizer |
| CN107255018A (en) * | 2017-07-11 | 2017-10-17 | 深圳市远东石油钻采工程有限公司 | A kind of non-rotation centralizer of variable-diameter roller type |
| CN109236278A (en) * | 2018-08-21 | 2019-01-18 | 中国石油天然气股份有限公司 | Downhole testing instrument integrated protection device |
| CN110043200A (en) * | 2019-04-22 | 2019-07-23 | 中国农业大学 | A kind of reducing centralizer of magnetic signal activation |
| CN110230474A (en) * | 2019-07-02 | 2019-09-13 | 北京长城博创科技有限公司 | Conductive centralizer |
| CN110725654B (en) * | 2019-11-30 | 2021-02-05 | 徐章翊 | Combined type sucker rod centralizer |
| CN110725654A (en) * | 2019-11-30 | 2020-01-24 | 孙庆云 | Combined type sucker rod centralizer |
| CN110924876A (en) * | 2019-12-18 | 2020-03-27 | 无棣荣业网具有限公司 | A but, reducing centralizer for pneumatic drill spraying |
| CN110924876B (en) * | 2019-12-18 | 2021-07-30 | 大庆市宏博晟达石油机械设备有限公司 | A but, reducing centralizer for pneumatic drill spraying |
| CN112012671B (en) * | 2020-10-19 | 2021-01-15 | 胜利油田固邦石油装备有限责任公司 | Anti-deformation elastic sleeve centralizer |
| CN114233209A (en) * | 2021-12-18 | 2022-03-25 | 江苏航天鸿鹏数控机械有限公司 | Hydraulic diameter-variable centralizer |
| CN114233209B (en) * | 2021-12-18 | 2024-04-30 | 江苏航天鸿鹏数控机械有限公司 | Hydraulic reducing centralizer |
| CN115405238A (en) * | 2022-10-14 | 2022-11-29 | 东营华辰石油装备有限公司 | Casing centralizer with adaptive diameter-changing function |
| CN115405238B (en) * | 2022-10-14 | 2024-06-11 | 东营华辰石油装备有限公司 | Casing centralizer with adaptive variable diameter function |
| CN116398062A (en) * | 2023-06-08 | 2023-07-07 | 山西国源煤层气综合利用工程技术股份有限公司 | Hydraulic control variable diameter centralizer for underground reaming |
| CN116398062B (en) * | 2023-06-08 | 2023-08-11 | 山西国源煤层气综合利用工程技术股份有限公司 | Hydraulic control variable diameter centralizer for underground reaming |
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|---|---|
| CN105781443B (en) | 2018-06-29 |
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