CN115929223A - Underground drilling centralizing mechanism - Google Patents
Underground drilling centralizing mechanism Download PDFInfo
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- CN115929223A CN115929223A CN202310159468.4A CN202310159468A CN115929223A CN 115929223 A CN115929223 A CN 115929223A CN 202310159468 A CN202310159468 A CN 202310159468A CN 115929223 A CN115929223 A CN 115929223A
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- elastic telescopic
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- 238000005553 drilling Methods 0.000 title claims abstract description 44
- 230000007246 mechanism Effects 0.000 title claims abstract description 13
- 238000001125 extrusion Methods 0.000 claims description 10
- 230000002093 peripheral effect Effects 0.000 claims description 7
- 238000005096 rolling process Methods 0.000 claims description 7
- 230000000149 penetrating effect Effects 0.000 claims description 3
- 239000002689 soil Substances 0.000 abstract description 11
- 230000000694 effects Effects 0.000 abstract description 3
- 238000000034 method Methods 0.000 description 6
- 239000011148 porous material Substances 0.000 description 5
- 230000008569 process Effects 0.000 description 5
- 239000003245 coal Substances 0.000 description 4
- 238000001514 detection method Methods 0.000 description 4
- 238000010276 construction Methods 0.000 description 3
- 238000009434 installation Methods 0.000 description 3
- 238000004519 manufacturing process Methods 0.000 description 2
- 239000011435 rock Substances 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000008859 change Effects 0.000 description 1
- 238000006243 chemical reaction Methods 0.000 description 1
- 230000008602 contraction Effects 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000005065 mining Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 239000000758 substrate Substances 0.000 description 1
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 1
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E10/00—Energy generation through renewable energy sources
- Y02E10/10—Geothermal energy
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Abstract
The invention relates to the field of underground drilling, in particular to an underground borehole centralizing mechanism. It includes drilling rod and centralizer, and the drilling rod includes well core rod and coaxial cover in well core rod's elastic telescopic rod, and the centralizer includes base member, supporting spring and ball, and well core rod is located to the base member slip cap and is connected with elastic telescopic rod, is provided with the mounting hole on the base member, and the ball inlays the dress in the mounting hole and exposes the mounting hole, and supporting spring sets up in mounting hole and its inner end and mounting hole fixed connection, outer end and ball butt. According to the invention, through the mutual matching of the centralizer and the drill rod, the centralizer can select the position with the hardest soil quality to support the drill rod within a certain range, so that reliable centralizing force is provided for the drill rod, the centralizing effect is ideal, and the drilling precision is high.
Description
Technical Field
The invention relates to the field of underground drilling, in particular to an underground borehole centralizing mechanism.
Background
Drilling of underground soil layers or rocks is an indispensable project in the mining process of coal mines, oil fields and the like, and on one hand, the drilling of underground soil layers or rocks is an important means for daily production geological detection of coal mines and oil fields, such as coal seam stability detection, small structure detection, hydrogeological detection and the like; on the other hand, the method is also a measure guarantee for solving the safety problem in the daily production of coal mines and oil fields, such as water drainage drilling holes, gas drainage holes and the like.
Before drilling, a professional technician needs to design a drilling position and a final hole position according to the drilling purpose, and the drilling position and the final hole position determine the design axis path of the drilling hole. In the construction process, along with the extension of the length of a drill rod, under the influence of the self weight of the drill rod, the hardness and softness of a stratum, the drilling pressure and the drilling speed, a drill bit is easy to deflect and shake, so that the actual axis path of a drilled hole deviates from the designed axis path, the difference between the actual axis path and the designed axis path is very large sometimes, great economic loss and potential safety hazard can be brought, and the problem can be effectively improved by using the centralizer.
The existing centralizer is generally divided into a rigid centralizer and a flexible centralizer, the rigid centralizer is easy to block and damage when in use, the flexible centralizer cannot provide enough righting force, and the existing centralizer is difficult to provide enough righting force when the soil quality of a hole wall is soft. Furthermore, most of the existing centralizers are integrated, so that the centralizers are inconvenient to assemble and disassemble and influence the construction efficiency.
Disclosure of Invention
According to the defects of the prior art, the invention provides an underground drilling hole righting mechanism, which aims to solve the problem that the existing drilling hole righting mechanism is insufficient in righting force.
The underground drilling centralizing mechanism adopts the following technical scheme: comprises a drill rod and a centralizer; the drill rod comprises a central rod, an elastic telescopic rod is coaxially sleeved on the outer side of the central rod, the fixed end of the elastic telescopic rod is arranged at a preset position close to the drilling end of the drill rod, and the initial elastic telescopic rod is in a contracted state;
the centralizer comprises a base body, a supporting spring and balls, wherein the base body is slidably sleeved outside the central rod and is connected with the movable end of the elastic telescopic rod, a plurality of mounting holes penetrating through the peripheral wall surface of the base body are formed in the base body, the balls are embedded in the mounting holes and exposed out of the mounting holes, and the balls can move along the axial direction of the mounting holes;
the supporting spring sets up in mounting hole and its inner end and mounting hole fixed connection, outer end and ball butt, and the hole wall that ball and drilling rod bored during the use is contradicted, and initial supporting spring makes the ball expose the biggest and ball can roll, and the mounting hole configures into and hinders the ball roll when the ball deepens to its inside under the extrusion of hole wall, and makes the ball stop rolling when the extrusion force that the ball received reaches the default.
Optionally, the mounting hole comprises two tapered holes which are communicated with each other, the large ends of the two tapered holes are connected with each other, the diameter of the joint is larger than that of the ball, and the small end of the tapered hole, which is far away from the center of the base body, of the mounting hole is smaller than that of the ball.
Optionally, the base includes a cylindrical mounting body and a spiral body disposed on an outer peripheral wall surface of the mounting body, the mounting body is slidably sleeved on the central rod, and the ball is embedded in the spiral body.
Optionally, the base body is divided into a first half body and a second half body, the first half body and the second half body are in a slip type, and the first half body and the second half body are connected with the elastic telescopic rod in a threaded mode after being buckled.
Optionally, the first half body and the second half body have the same radian, one end face of the first half body and the other end face of the second half body are both provided with an anti-drop arc plate, the other end face of the first half body and the other end face of the second half body are both provided with an anti-drop arc groove, the anti-drop arc plate of the first half body is inserted into the anti-drop arc groove of the second half body, and the anti-drop arc plate of the second half body is inserted into the anti-drop arc groove of the first half body.
Optionally, the first half body and the second half body are axially bolted.
Optionally, the first half body and the second half body are provided with a connecting block at one end close to the elastic telescopic rod, and the connecting block is in threaded connection with the elastic telescopic rod.
Optionally, the elastic telescopic rod comprises a first rod body, a second rod body and an adjusting spring; the first rod body is coaxially arranged on the outer side of the center rod and fixedly connected with the center rod, the second rod body is coaxially sleeved on the outer side of the center rod and is inserted in the first rod body in a sliding mode, the adjusting spring is sleeved on the center rod and is located inside the cavity of the first rod body and the cavity of the second rod body, one end of the adjusting spring is connected with the first rod body, and the other end of the adjusting spring is connected with the second rod body.
The beneficial effects of the invention are: according to the underground drilling centralizer mechanism, the elastic telescopic rod is additionally arranged on the central rod of the drill rod, the centralizer is sleeved on the central rod and is connected with the elastic telescopic rod, and the centralizer can be always kept at the position with the hardest soil quality within the range of fixed depth of each section through the conversion of the friction state of the balls in the drilling process of the drill rod, so that reliable centralizing force is provided for the drill rod, the centralizing effect is ideal, and the drilling precision is high; meanwhile, the centralizer and the drill rod can move relatively to each other in the axial direction through the arrangement of the elastic telescopic rod, the centralizer cannot be easily clamped or damaged like a common rigid centralizer, and the proper centralizing force can be guaranteed to be provided.
Furthermore, the centralizer adopts split type detachable construction, through the mode combination that the lock is connected, assembles reliably, easy dismounting is convenient for maintain and change, and the practicality is high.
Drawings
In order to illustrate embodiments of the invention or prior art solutions more clearly, the drawings that are needed in the description of the embodiments or prior art will be briefly described below, it being apparent that the drawings in the following description are only some embodiments of the invention and that other drawings may be derived from those without inventive effort by a person skilled in the art, it being understood that the drawings are not necessarily drawn to scale.
FIG. 1 is a schematic view of the overall structure of a downhole borehole centralizer mechanism of the present invention;
FIG. 2 is an elevation view of a downhole borehole centralizer mechanism of the present invention;
FIG. 3 isbase:Sub>A cross-sectional view taken along line A-A of FIG. 2;
FIG. 4 is a schematic view of the centralizer of the present invention;
FIG. 5 is a side view of the centralizer of the present invention;
FIG. 6 is another side view of the inventive centralizer;
fig. 7 is a split schematic view of the centralizer of the invention.
In the figure: 100. a centralizer; 101. a substrate; 1011. an installation body; 1012. a helical body; 104. a support spring; 105. a ball bearing; 110. a first half body; 120. a second half body; 130. an anti-falling arc plate; 140. an anti-drop arc groove; 150. connecting blocks; 160. a limiting plate; 170. a bolt; 300. a drill stem; 310. a center pole; 320. an elastic telescopic rod; 321. a first rod body; 322. a second rod body; 323. the spring is adjusted.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be obtained by a person skilled in the art without making any creative effort based on the embodiments in the present invention, belong to the protection scope of the present invention.
As shown in fig. 1 to 7, a downhole borehole centralizer mechanism of the present invention includes a drill rod 300 and a centralizer 100; the drill rod 300 comprises a central rod 310, an elastic telescopic rod 320 is coaxially sleeved outside the central rod 310, the initial elastic telescopic rod 320 is in a contraction state, the fixed end of the elastic telescopic rod 320 is arranged at a preset position close to the drilling end of the drill rod 300, and the movable end of the elastic telescopic rod 320 is far away from the drilling end of the drill rod 300.
The centralizer 100 comprises a base body 101, a supporting spring 104 and balls 105, wherein the base body 101 is slidably sleeved outside the central rod 310 and is connected with the movable end of the elastic telescopic rod 320, a plurality of mounting holes penetrating through the outer peripheral wall surface of the base body 101 are formed in the base body 101, the axis of each mounting hole extends along the radial direction of the base body 101, the balls 105 are embedded in the mounting holes and exposed out of the mounting holes, the balls 105 can move along the axial direction of the mounting holes, and the preferred mounting holes maximally allow the balls 105 to be exposed nearly half but cannot be exposed half to cause falling.
The supporting spring 104 is arranged inside the mounting hole, the inner end of the supporting spring is fixedly connected with the mounting hole, the outer end of the supporting spring is abutted to the ball 105 (the axis close to the base body 101 is inward, and the axial direction far away from the base body 101 is outward), the ball 105 is abutted to the wall of the hole drilled by the drill rod 300 in use, the initial supporting spring 104 enables the ball 105 to be exposed to the maximum and enables the ball 105 to roll, the ball 105 has a tendency of entering the mounting hole under the extrusion of the hole wall, the mounting hole is configured to prevent the ball 105 from rolling when the ball 105 penetrates deeply into the mounting hole under the extrusion of the hole wall, and the ball 105 stops rolling when the extrusion force applied to the ball 105 reaches a preset value.
It should be noted that the present invention can be used singly or in combination of a plurality of drill rods, and during the use, the drill rod 300 at the frontmost end (drilling end) is provided with a drill (not shown in the drawings, and the left side in fig. 1 is the drilling end) to drill a hole, and the centralizer 100 is provided on the drill rod 300 at the frontmost end, and a technician determines whether to install the centralizer 100 on the drill rod 300 or which section of the drill rod 300 to install the centralizer 100 on.
In operation, the drill rod 300 drives the drill bit to drill a hole downwards, and during the drilling process of the drill rod 300, the ball 105 abuts against the opened hole wall, and the support spring 104 enables the ball 105 to move properly in the mounting hole. When the soil of the punched hole wall is soft, the extrusion force of the hole wall to the ball 105 is not enough to overcome the elastic force of the supporting spring 104, the ball 105 is difficult to go deep into the mounting hole, the ball 105 and the hole wall roll and rub, and the centralizer 100 moves along with the drill rod 300. When the pore wall soil property of breaching through is harder, the extrusion force of pore wall to ball 105 increases, ball 105 is pushed into in the mounting hole, because ball 105 stretches into the mounting hole more and the frictional force of mounting hole is big more, when the extrusion force of pore wall to ball 105 increases to the default, ball 105 stops rolling, ball 105 changes sliding friction into with the pore wall from rolling friction, centralizer 100 is whole unable to move along with drilling rod 300, and then provides reliable righting power (that is to say centralizer 100 selects the place that soil property is harder to provide reliable support to drilling rod 300). As the drill rod 300 drills, the elastic telescopic rod 320 extends, when the elastic telescopic rod 320 extends to the limit position, the centralizer 100 is pulled by the drill rod 300, at this moment, the elastic telescopic rod 320 resets and drives the centralizer 100 to move downwards integrally, and one round is completed. Thereafter, the drill rod 300 continues to drill, and when the drill rod meets the position where the pore wall soil is hard enough (can provide enough righting force), the balls 105 become sliding friction again, and the centralizer 100 is prevented from moving downwards integrally, so that reliable righting force is provided for the drill rod 300. Through the arrangement, the centralizer 100 and the drill rod 300 in the drilling hole centralizing mechanism are matched, the centralizer 100 can select the position with the hardest soil quality to support the drill rod 300 within a certain range (within the moving range of the elastic telescopic rod 320), and further reliable centralizing force is provided for the drill rod 300, the centralizing effect is ideal, and the drilling precision is high.
In a further embodiment, the mounting hole comprises two conical holes which are communicated with each other, the big ends of the two conical holes are connected with each other, the diameter of the joint is larger than that of the ball 105, the small end of the conical hole, far away from the center of the base body 101, of the mounting hole is smaller than that of the ball 105, namely the opening of the mounting hole is smaller than that of the ball 105, so that the ball 105 is prevented from falling off. By the arrangement of the tapered hole, the deeper the mounting hole is, the narrower the mounting hole is, and further, the more the ball 105 extends into the mounting hole, the larger the friction force is applied, thereby preventing the ball 105 from rolling.
In a further embodiment, as shown in fig. 3, the elastic expansion rod 320 comprises a first rod 321, a second rod 322 and an adjusting spring 323; the first rod body 321 is coaxially arranged outside the center rod 310 and is fixedly connected with the center rod 310, and one side of the first rod body 321, which is far away from the drilling end of the drill rod 300, is open and hollow; the second rod body 322 is coaxially sleeved outside the central rod 310 and is slidably inserted into the first rod body 321, the adjusting spring 323 is sleeved inside the central rod 310 and is located inside the cavities of the first rod body 321 and the second rod body 322, one end of the adjusting spring 323 is connected to the first rod body 321, the other end of the adjusting spring 323 is connected to the second rod body 322, and the second rod body 322 is connected to the base 101 of the centralizer 100.
In a further embodiment, as shown in fig. 1, 2 and 3, the base 101 includes a cylindrical mounting body 1011 and a screw 1012 disposed on an outer peripheral wall surface of the mounting body 1011, the mounting body 1011 is slidably sleeved on the central rod 310, and the ball 105 is fitted on the screw 1012. In the drilling process, the spiral body 1012 can convey and discharge the broken stones and soil blocks drilled by the drill bit outwards, so as to ensure the smooth drilling.
In a further embodiment, as shown in fig. 7, the base 101 is divided into a first half body 110 and a second half body 120, the first half body 110 and the second half body 120 are slip-type, and the first half body 110 and the second half body 120 are fastened and connected and then are in threaded connection with the elastic expansion rod 320, so that the installation of the centralizer 100 is facilitated by adopting a split structure, the assembly and disassembly efficiency is greatly improved, and the practicability is enhanced.
Further, the radian of the first half body 110 is the same as that of the second half body 120, an anti-slip arc plate 130 is disposed on one end surface of the first half body 110 and the second half body 120 in the circumferential direction, an anti-slip arc groove 140 is disposed on the other end surface of the first half body 110 and the second half body 120, the anti-slip arc plate 130 of the first half body 110 is inserted into the anti-slip arc groove 140 of the second half body 120, and the anti-slip arc plate 130 of the second half body 120 is inserted into the anti-slip arc groove 140 of the first half body 110, so that the first half body 110 and the second half body 120 are radially connected. The first half body 110 and the second half body 120 are axially connected by bolts 170, specifically, a limiting plate 160 is arranged on an end surface of the first half body 110 away from the drilling end of the drill rod 300, both ends of the limiting plate 160 in the circumferential direction exceed the first half body 110, a threaded hole is arranged on an end surface of the second half body 120 away from the drilling end of the drill rod 300, and the bolts 170 penetrate through the limiting plate 160 and extend into the threaded hole to axially connect the first half body 110 and the second half body 120. The first half body 110 and the second half body 120 are provided with a connecting block 150 at one end (drilling end) close to the elastic expansion link 320, and the connecting block 150 is provided with threads for connecting with the elastic expansion link 320.
When the assembly is performed, the first half body 110 and the second half body 120 are fastened on two sides of the central rod 310 (the first half body 110 is staggered with the second half body 120 in front, the drilling direction is front, or vice versa), then the anti-dropping arc plates 130 and the anti-dropping arc grooves 140 of the first half body 110 and the second half body 120 are aligned with each other, the second half body 120 is slid towards the first half body 110 until the second half body 120 is pushed against the limiting plate 160, the first half body 110 and the second half body 120 are assembled in place, and then the first half body 110 and the second half body 120 are axially connected by using the bolts 170, so that the assembly of the first half body and the second half body 120 is completed. After the first half body 110 and the second half body 120 are combined, the whole body is pushed towards the elastic telescopic rod 320, the inner peripheral wall of the second rod body 322 of the elastic telescopic rod 320 is also provided with threads, and the centralizer 100 is rotated to be connected with the elastic telescopic rod 320, so that the installation is completed.
The above description is only for the purpose of illustrating the preferred embodiments of the present invention and is not to be construed as limiting the invention, and any modifications, equivalents, improvements and the like that fall within the spirit and principle of the present invention are intended to be included therein.
Claims (8)
1. The utility model provides a mechanism is right in drilling in pit which characterized in that: comprises a drill rod and a centralizer; the drill rod comprises a central rod, an elastic telescopic rod is coaxially sleeved on the outer side of the central rod, the fixed end of the elastic telescopic rod is arranged at a preset position close to the drilling end of the drill rod, and the initial elastic telescopic rod is in a contracted state;
the centralizer comprises a base body, a supporting spring and balls, wherein the base body is slidably sleeved outside the central rod and is connected with the movable end of the elastic telescopic rod, a plurality of mounting holes penetrating through the peripheral wall surface of the base body are formed in the base body, the balls are embedded in the mounting holes and exposed out of the mounting holes, and the balls can move along the axial direction of the mounting holes;
the supporting spring sets up in mounting hole and its inner end and mounting hole fixed connection, outer end and ball butt, and the hole wall that ball and drilling rod bored during the use is contradicted, and initial supporting spring makes the ball expose the biggest and ball can roll, and the mounting hole configures into and hinders the ball roll when the ball deepens to its inside under the extrusion of hole wall, and makes the ball stop rolling when the extrusion force that the ball received reaches the default.
2. A downhole borehole centralizer according to claim 1, wherein: the mounting hole includes two bell mouths that are linked together, and two bell mouth big ends are linked together and the diameter of junction is greater than the diameter of ball, and the bell mouth tip diameter that the mounting hole kept away from the base member center is less than the diameter of ball.
3. A downhole borehole centralizer according to claim 1, wherein: the base body comprises a cylindrical mounting body and a spiral body arranged on the peripheral wall surface of the mounting body, the mounting body is slidably sleeved on the central rod, and the ball is embedded in the spiral body.
4. A downhole borehole centralizer according to claim 1, wherein: the base body is divided into a first half body and a second half body, the first half body and the second half body are in a slip type, and the first half body and the second half body are connected with the elastic telescopic rod in a threaded mode after being buckled.
5. A downhole borehole centralizer according to claim 4, characterized in that: the radian of the first half body is the same as that of the second half body, one end face of the first half body and one end face of the second half body in the circumferential direction are provided with anti-falling arc plates, the other end face of the first half body is provided with anti-falling arc grooves, the anti-falling arc plates of the first half body are inserted in the anti-falling arc grooves of the second half body, and the anti-falling arc plates of the second half body are inserted in the anti-falling arc grooves of the first half body.
6. A downhole borehole centralizer according to claim 4, wherein: the first half body and the second half body are axially connected by bolts.
7. A downhole borehole centralizer according to claim 4, wherein: the first half body and the second half body are provided with connecting blocks at the ends close to the elastic telescopic rod, and the connecting blocks are in threaded connection with the elastic telescopic rod.
8. A downhole borehole centralizer according to claim 1, wherein: the elastic telescopic rod comprises a first rod body, a second rod body and an adjusting spring; the first rod body is coaxially arranged on the outer side of the center rod and fixedly connected with the center rod, the second rod body is coaxially sleeved on the outer side of the center rod and is inserted in the first rod body in a sliding mode, the adjusting spring is sleeved on the center rod and is located inside the cavity of the first rod body and the cavity of the second rod body, one end of the adjusting spring is connected with the first rod body, and the other end of the adjusting spring is connected with the second rod body.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202310159468.4A CN115929223B (en) | 2023-02-24 | 2023-02-24 | Underground drilling centralizing mechanism |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202310159468.4A CN115929223B (en) | 2023-02-24 | 2023-02-24 | Underground drilling centralizing mechanism |
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| CN115929223A true CN115929223A (en) | 2023-04-07 |
| CN115929223B CN115929223B (en) | 2023-05-16 |
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| CN216741394U (en) * | 2022-02-25 | 2022-06-14 | 中国石油化工股份有限公司 | Underground pipe column centralizer |
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| CN205840807U (en) * | 2016-07-04 | 2016-12-28 | 西南石油大学 | A kind of reducing rolling wheel centralizer |
| CN207988971U (en) * | 2018-01-04 | 2018-10-19 | 成都川嘉恒锐钻采科技有限公司 | A kind of kelly bar centralizer |
| CN208024304U (en) * | 2018-01-17 | 2018-10-30 | 大庆市晟威机械制造有限公司 | A kind of big channel elasticity compensation proof-wear sucker rod centralising device |
| CN208122778U (en) * | 2018-04-12 | 2018-11-20 | 深圳市远东石油钻采工程有限公司 | A kind of non-rotation centralizer of bobbin type elasticity |
| CN110029948A (en) * | 2019-06-03 | 2019-07-19 | 中铁隧道集团一处有限公司 | Drill bit erection device for long range horizontal drilling of constructing |
| CN213573952U (en) * | 2021-06-03 | 2021-06-29 | 东营中昶能源科技有限公司 | Underground compression type centralizer |
| CN115680514A (en) * | 2021-07-28 | 2023-02-03 | 中国石油天然气股份有限公司 | Drilling type supporting casing centralizer |
| CN216157609U (en) * | 2021-08-17 | 2022-04-01 | 天津精工石油专用管件股份有限公司 | Centralizer for oil development |
| CN114016909A (en) * | 2021-09-30 | 2022-02-08 | 北京中煤矿山工程有限公司 | Drill bit centering device for constructing long-distance horizontal drilling |
| CN216811603U (en) * | 2021-10-14 | 2022-06-24 | 中国石油化工股份有限公司 | Roller centralizer |
| CN216741394U (en) * | 2022-02-25 | 2022-06-14 | 中国石油化工股份有限公司 | Underground pipe column centralizer |
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