CN109306853B - Fishing device with bridging plug milling function - Google Patents
Fishing device with bridging plug milling function Download PDFInfo
- Publication number
- CN109306853B CN109306853B CN201811124170.5A CN201811124170A CN109306853B CN 109306853 B CN109306853 B CN 109306853B CN 201811124170 A CN201811124170 A CN 201811124170A CN 109306853 B CN109306853 B CN 109306853B
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- shoe body
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- 238000003801 milling Methods 0.000 title claims abstract description 45
- 238000005520 cutting process Methods 0.000 claims abstract description 147
- 239000007788 liquid Substances 0.000 claims abstract description 26
- 238000000227 grinding Methods 0.000 claims abstract description 15
- 239000000956 alloy Substances 0.000 claims abstract description 3
- 229910045601 alloy Inorganic materials 0.000 claims abstract description 3
- 230000007704 transition Effects 0.000 claims description 9
- 239000000463 material Substances 0.000 claims description 6
- UONOETXJSWQNOL-UHFFFAOYSA-N tungsten carbide Chemical compound [W+]#[C-] UONOETXJSWQNOL-UHFFFAOYSA-N 0.000 claims description 3
- 238000005553 drilling Methods 0.000 abstract description 16
- 238000000034 method Methods 0.000 abstract description 9
- 230000008569 process Effects 0.000 abstract description 3
- 238000001914 filtration Methods 0.000 description 5
- 239000012530 fluid Substances 0.000 description 5
- 230000009471 action Effects 0.000 description 4
- 239000012634 fragment Substances 0.000 description 4
- 239000000843 powder Substances 0.000 description 3
- 241000251468 Actinopterygii Species 0.000 description 2
- 230000005484 gravity Effects 0.000 description 2
- 238000003466 welding Methods 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000004140 cleaning Methods 0.000 description 1
- 238000010276 construction Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 230000006872 improvement Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 239000003208 petroleum Substances 0.000 description 1
- 230000009466 transformation Effects 0.000 description 1
Images
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
- E21B31/00—Fishing for or freeing objects in boreholes or wells
- E21B31/12—Grappling tools, e.g. tongs or grabs
- E21B31/16—Grappling tools, e.g. tongs or grabs combined with cutting or destroying means
-
- 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
- E21B31/00—Fishing for or freeing objects in boreholes or wells
- E21B31/12—Grappling tools, e.g. tongs or grabs
- E21B31/18—Grappling tools, e.g. tongs or grabs gripping externally, e.g. overshot
Landscapes
- Life Sciences & Earth Sciences (AREA)
- Engineering & Computer Science (AREA)
- Geology (AREA)
- Mining & Mineral Resources (AREA)
- Marine Sciences & Fisheries (AREA)
- Physics & Mathematics (AREA)
- Environmental & Geological Engineering (AREA)
- Fluid Mechanics (AREA)
- General Life Sciences & Earth Sciences (AREA)
- Geochemistry & Mineralogy (AREA)
- Finish Polishing, Edge Sharpening, And Grinding By Specific Grinding Devices (AREA)
Abstract
The invention discloses a fishing device with a bridge plug grinding and milling function, which comprises a connector body, a milling shoe body and a fishing barrel; the fishing barrel is arranged on the periphery of the connecting body, and the connecting body extends out of the upper part of the fishing barrel from the inner bottom of the fishing barrel; the center of the bottom of the milling shoe body is provided with an annular cutting surface; a plurality of fan-shaped cutting surfaces are arranged at intervals around the annular cutting surface; the fan-shaped cutting surfaces extend out of the grinding shoe body, so that a liquid drainage groove is formed between every two adjacent fan-shaped cutting surfaces; a liquid drainage inclined hole communicated with the working liquid channel is formed in the bottom of the grinding shoe body between every two adjacent fan-shaped cutting surfaces; and the annular cutting surface and the fan-shaped cutting surface are both provided with a plurality of cutting edges made of high-density hard alloy. The fishing device integrates the functions of milling and fishing, reduces the drilling and drilling times and the tool replacement times in the drilling and well repairing processes, simplifies the operation procedure and improves the working efficiency.
Description
Technical Field
The invention relates to the technical field of underground construction in the petroleum and gas industry, in particular to a fishing device with a bridge plug grinding and milling function.
Background
During coiled tubing operations, many cuttings are produced downhole during drilling, plugging, workover, etc., such as drag bits, drift gauges, cones, slips, packers, bridge plug fragments, tool joints, deep well pump accessories, and other relatively long tools.
In the existing technology for salvaging the fallen objects in the well during drilling and repairing, firstly, the fallen objects in the well are ground and milled by using a grinding shoe, and then the ground and milled fragments are salvaged by using other salvaging modes, so that the times of drilling and tripping are increased, the times of tool replacement and the complexity of an operation procedure are increased, and the improvement of the drilling efficiency is very unfavorable.
Disclosure of Invention
The invention aims to: the fishing device with the bridge plug milling function not only has the bridge plug and underground falling object milling function, but also has the fishing function, is used for reducing the drilling-up and drilling-down times in the drilling and well repairing processes, reducing the tool replacement times and simplifying the operation procedure so as to improve the working efficiency.
The technical scheme adopted by the invention is as follows:
a fishing device with a bridge plug grinding and milling function comprises a connector body and a milling shoe body, wherein the milling shoe body is integrally arranged at the bottom of the connector body; a working liquid channel extending into the grinding shoe body is arranged in the connector body; the fishing device also comprises a fishing barrel fixedly arranged on the periphery of the connecting body, and the connecting body extends out of the inner bottom of the fishing barrel and above the fishing barrel; the center of the bottom of the milling shoe body is provided with an annular cutting surface; a plurality of fan-shaped cutting surfaces are arranged at intervals around the annular cutting surface; the fan-shaped cutting surfaces extend out of the grinding shoe body, so that a liquid drainage groove is formed between every two adjacent fan-shaped cutting surfaces; a liquid drainage inclined hole communicated with the working liquid channel is formed in the bottom of the grinding shoe body between every two adjacent fan-shaped cutting surfaces; and the annular cutting surface and the fan-shaped cutting surface are both provided with a plurality of cutting edges made of high-density hard alloy.
Furthermore, the side wall of the bottom end of the overshot is provided with filter windows at intervals, and the filter windows are provided with a plurality of filter holes for separating working liquid from falling objects.
Furthermore, a diversion trench corresponding to the position of the liquid drainage groove is formed in the outer wall of the fishing barrel, so that falling objects rushing up from the liquid drainage groove along with working liquid can enter the fishing barrel.
Furthermore, the fan-shaped cutting surface is composed of an auxiliary cutting surface and a main cutting surface, the main cutting surface is positioned between the annular cutting surface and the auxiliary cutting surface, and the height of the auxiliary cutting surface is lower than that of the main cutting surface.
Furthermore, the height difference between the main cutting surface and the auxiliary cutting surface is 1-5 mm, so that the top of the cutting edge on the auxiliary cutting surface is ensured to extend out of the main cutting surface for assisting in crushing the torn larger fragments, and meanwhile, the cutting depth of the cutting edge in the milling process is limited.
Further, the connector body comprises an internal thread connecting end, a column body and a transition end which are connected integrally from top to bottom in sequence, and the bottom of the fishing barrel is fixedly arranged at the top of the transition end.
Further, the cutting edge is of a triangular cone structure, and the included angle between two adjacent edges of the cutting edge facing the material end is 90 degrees. The angled cutting edge is more likely to tear the bridge plug. If the angle is too large, the cutting edge is difficult to efficiently tear the bridge plug, so that the efficiency of milling to each stage of bridge plug rubber cylinder is reduced, and the phenomenon of bit jamming can frequently occur; if the angle is too small, the impact resistance of the cutting edge is lowered, resulting in a shortened service life.
Further, the cutting edge is mainly made of a tungsten carbide material.
The fishing device of this scheme, its theory of operation does: when drilling a plug or milling a downhole falling object, the annular cutting face, the main cutting face and the auxiliary cutting face are matched with each other, so that the bridge plug or the downhole falling object can be torn and crushed into small blocks and powder; meanwhile, the cutting edge on the auxiliary cutting surface can limit the cutting depth of the cutting edge in the milling process, and the complete cutting function is further ensured after the cutting edges on the annular cutting surface and the main cutting surface are worn; the milling shoe body of the fishing device grinds bridge plugs or fallen objects which are difficult to fish at the well bottom, the ground fallen objects are flushed to the upper part of the fishing barrel from the liquid drainage groove under the action of working liquid, at the moment, the upward return flow passage of the working liquid is increased, the flow rate is sharply reduced and the fallen objects sink into the fishing barrel, so that the fallen objects are continuously deposited in the fishing barrel under the action of gravity, and the purposes of milling and fishing in a whole are achieved. Therefore, the fishing device solves the technical problems that in the prior art, the number of times of tripping and tripping is large, the number of times of tool replacement is increased, and the operation procedure is complicated, and improves the working efficiency of drilling.
In summary, due to the adoption of the technical scheme, the invention has the beneficial effects that:
1. the fishing device integrates the functions of milling and fishing, reduces the drilling and drilling times and tool replacement times in the drilling and well repairing processes, simplifies the operation procedures and improves the working efficiency.
2. According to the fishing device, the annular cutting face, the main cutting face and the auxiliary cutting face are matched with each other, so that the bridge plug or other falling objects can be torn and crushed into small blocks and powder, and the working efficiency is high; meanwhile, the cutting edge on the auxiliary cutting face can limit the cutting depth of the cutting edge in the milling process, and the complete cutting function is further ensured after the cutting edges on the annular cutting face and the main cutting face are worn.
3. According to the fishing device, when the fishing device works, the linear velocity of circular motion on the auxiliary cutting face is the highest, the auxiliary cutting face is set to be lower than the main cutting face, the cutting edge on the auxiliary cutting face can be guaranteed to further grind large fallen objects which are not ground by the cutting edges on the annular cutting face and the main cutting face, the fallen objects are guaranteed to be milled and fished thoroughly, and the serious accident of drilling and jamming caused by incomplete cleaning of the fallen objects is effectively prevented.
4. This scheme fishing device, the cutting edge sets up the contained angle that sets up to triangle-shaped toper structure and adjacent two edges to be 90, compares zigzag cutting edge or other polyhedron cutting edges, and the cutting edge that adopts this structural design is good to the tearing effect of bridging plug, bores and fills up efficiently, has effectively solved that current junk mill is easy disconnected tooth, bores and fills up work efficiency low, life is short and bore when filling up massive fragments remain too much, appears the bit phenomenon easily.
5. The fishing device has the advantages of simple structure, easy processing through a numerical control lathe, wide application in the transformation of shoe grinding tools, and easy popularization and application.
Drawings
FIG. 1 is a schematic structural view of the fishing device of the present invention;
FIG. 2 is a schematic structural view of an embodiment of the overshot of the invention;
FIG. 3 is a cross-sectional view of the connector body and the milling shoe body of the present invention;
FIG. 4 is a schematic structural view of the body of the present invention;
FIG. 5 is a schematic view of the cutting edge configuration of the present invention;
fig. 6 is a schematic structural view of another embodiment of the overshot of the invention.
Labeled as: 1-connector body, 2-milling shoe body, 3-fishing barrel, 11-internal thread connecting end, 12-column body, 13-transition end, 14-working fluid channel, 15-thread connecting hole, 21-annular cutting surface, 22-fan-shaped cutting surface, 23-drainage inclined hole, 24-drainage groove, 25-cutting edge, 221-main cutting surface, 222-auxiliary cutting surface, 31-filtering window, 32-filtering hole and 33-diversion trench.
Detailed Description
All features disclosed in this specification may be combined in any combination, except features and/or steps that are mutually exclusive.
The present invention will be described in detail with reference to the accompanying drawings.
Example 1
Referring to fig. 1 to 5, a fishing device with a bridge plug milling function includes a connector body 1, a milling shoe body 2 and a fishing barrel 3. The connector body 1 consists of an internal thread connecting end 11, a column body 12 and a transition end 13 in sequence from top to bottom; the milling shoe body 2 is integrally arranged at the bottom of the transition end 13. The overshot 3 is sleeved on the connector body 1.
The internal thread connecting end 11, the column body 12 and the transition end 13 are integrally formed. The top of the internal thread connecting end 11 is provided with a thread connecting hole 15 extending inwards; the diameter of the threaded connection hole 15 is gradually reduced from top to bottom. A working fluid channel 14 is arranged inside the column body 12; one end of the working fluid channel 14 is communicated with the threaded connecting hole 15, and the other end of the working fluid channel penetrates through the column body 12 and the transition end 13 in sequence and extends into the grinding shoe body 2.
The bottom of the overshot 3 can be arranged on the top of the transition end 13 by welding or bolt fastening, and the cylinder 12 extends out of the inner bottom of the overshot 3 and above the overshot 3.
The diameter of the overshot 3 is not larger than that of the shoe body 2 so as to salvage the junk ground by the shoe body 2.
The filtering windows 31 are arranged on the side wall of the bottom end of the overshot 3 at intervals, and a plurality of filtering holes 32 are formed in the filtering windows 31 and used for separating working liquid from falling objects.
The bottom center of the mill shoe body 2 is provided with an annular cutting surface 21, and a plurality of fan-shaped cutting surfaces 22 are arranged around the annular cutting surface 21 at intervals. The sector-shaped cutting surfaces 22 extend out of the milling shoe body 2 so that a drainage groove 24 is formed between two adjacent sector-shaped cutting surfaces 22.
The annular cutting surface 21 and the fan-shaped cutting surface 22 are integrally connected with the bottom of the milling shoe body 2. The bottom of the mill body 2 between two adjacent fan-shaped cutting surfaces 22 is provided with a liquid drainage inclined hole 23, and the liquid drainage inclined hole 23 is communicated with the working liquid channel 14.
The diameter of the liquid drainage inclined hole 23 is 14-16 mm.
The fan-shaped cutting surface 22 is composed of a main cutting surface 221 and an auxiliary cutting surface 222, and the main cutting surface 221 is located between the annular cutting surface 21 and the auxiliary cutting surface 222. The height of the auxiliary cutting surface 222 is lower than that of the main cutting surface 221, and the height difference between the main cutting surface 221 and the auxiliary cutting surface 222 is 1-5 mm.
The annular cutting surface 21, the main cutting surface 221 and the auxiliary cutting surface 222 are all provided with a plurality of cutting edges 25 made of high-density cemented carbide. The cutting edge 25 is of a triangular cone structure, and the included angle between two adjacent edges of the cutting edge 25 facing the material end is 90 degrees. The cutting edge 25 of the structure is easier to tear the bridge plug, because if the angle is too large, the cutting edge 25 is difficult to tear the bridge plug efficiently, the efficiency of grinding and milling the bridge plug rubber cylinder part at each stage is reduced, and the phenomenon of bit jamming can frequently occur; if the angle is too small, the impact resistance of the cutting edge 25 is lowered, resulting in a shortened service life.
The cutting edge 25 is mainly made of a tungsten carbide material.
The cutting edge 25 is fixed to the annular cutting surface 21, the main cutting surface 221, and the auxiliary cutting surface 222 by welding.
Example 2
Referring to fig. 6, the outer wall of the overshot 3 is provided with a diversion groove 33 corresponding to the position of the drainage groove 24 on the milling shoe body 2, so as to enter the overshot 3 along with the falling objects flushed from the drainage groove 24 by the working fluid.
The fishing device of this scheme, its theory of operation does: when drilling plugs or milling underground falling objects, the annular cutting face 21, the main cutting face 221 and the cutting edge 25 on the auxiliary cutting face 222 are matched with each other, so that the bridge plugs or the underground falling objects can be torn and crushed into small blocks and powder; meanwhile, the cutting edge 25 on the auxiliary cutting surface 222 can limit the cutting depth of the cutting edge 25 in the milling process, and the complete cutting function is further ensured after the annular cutting surface 21 and the cutting edge 25 on the main cutting surface 221 are abraded; the milling shoe body 2 of the fishing device grinds bridge plugs or fallen objects which are difficult to fish at the bottom of a well, the ground fallen objects are flushed to the upper part of the fishing barrel 3 from the liquid drainage groove 24 under the action of working liquid, at the moment, the upward flow channel of the working liquid is increased, the flow rate is sharply reduced and the fallen objects sink into the fishing barrel 3, so that the fallen objects are continuously deposited in the fishing barrel 3 under the action of gravity, and the purposes of milling and fishing in a whole are achieved. Therefore, the fishing device solves the technical problems that in the prior art, the number of times of tripping and tripping is large, the number of times of tool replacement is increased, and the operation procedure is complicated, and improves the working efficiency of drilling.
The foregoing is a primary feature of the present solution and its advantages, and it should be understood by those skilled in the art that the present solution is not limited by the foregoing embodiments, and that the foregoing embodiments and descriptions are only illustrative of the principles of the present solution, and that various changes and modifications may be made therein without departing from the spirit and scope of the present solution, which fall within the scope of the invention as claimed, and the scope of the present solution is defined by the appended claims and their equivalents.
In the description of the present invention, it should also be noted that, unless otherwise explicitly specified or limited, the terms "disposed," "mounted," "connected," and "connected" are to be construed broadly and may, for example, be fixedly connected, detachably connected, or integrally connected; can be mechanically or electrically connected; either directly or indirectly through an intermediary profile, or both. The specific meanings of the above terms in the present invention can be understood by those skilled in the art according to specific situations.
Claims (7)
1. A fishing device with a bridge plug milling function comprises a connector body (1) and a milling shoe body (2), wherein the milling shoe body (2) is integrally arranged at the bottom of the connector body (1); the connecting head body (1) is internally provided with a working liquid channel (14) extending into the milling shoe body (2), and also comprises a fishing barrel (3) fixedly arranged on the periphery of the connecting body, and the connecting body extends out of the upper part of the fishing barrel (3) from the inner bottom of the fishing barrel (3); an annular cutting surface (21) is arranged at the center of the bottom of the milling shoe body (2); a plurality of fan-shaped cutting surfaces (22) are arranged at intervals around the annular cutting surface (21); the fan-shaped cutting surfaces (22) extend out of the grinding shoe body (2) so that a liquid drainage groove (24) is formed between every two adjacent fan-shaped cutting surfaces (22); a liquid discharge inclined hole (23) communicated with the working liquid channel (14) is formed in the bottom of the grinding shoe body (2) between every two adjacent fan-shaped cutting surfaces (22); the annular cutting surface (21) and the fan-shaped cutting surface (22) are both provided with a plurality of cutting edges (25) made of high-density hard alloy, and the circular cutting surface is characterized in that the fan-shaped cutting surface (22) is composed of an auxiliary cutting surface (222) and a main cutting surface (221), the main cutting surface (221) is positioned between the annular cutting surface (21) and the auxiliary cutting surface (222), and the height of the auxiliary cutting surface (222) is lower than that of the main cutting surface (221).
2. A fishing device with a bridge plug milling function according to claim 1, characterized in that the sidewall of the bottom end of the fishing barrel (3) is provided with a filter window (31) at intervals, and the filter window (31) is provided with a plurality of filter holes (32).
3. A fishing device with a bridge plug milling function according to claim 1, characterized in that a diversion trench (33) corresponding to the drainage groove (24) is arranged on the outer wall of the fishing barrel (3).
4. A fishing device with bridge plug milling function according to claim 1, characterized in that the height difference between the main cutting surface (221) and the auxiliary cutting surface (222) is 1-5 mm.
5. The fishing device with the bridge plug grinding and milling function according to claim 1, characterized in that the connector body (1) sequentially consists of an internal thread connecting end (11), a cylinder body (12) and a transition end (13) which are integrally connected from top to bottom, and the bottom of the fishing barrel (3) is fixedly arranged at the top of the transition end (13).
6. A fishing device with a bridge plug milling function according to claim 1, characterized in that the cutting edge (25) is of a triangular cone structure, and the included angle between two adjacent edges of the cutting edge (25) facing the material end is 90 degrees.
7. A fishing device with bridge plug milling function according to claim 1, characterized in that the cutting edge (25) is mainly made of tungsten carbide material.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201811124170.5A CN109306853B (en) | 2018-09-26 | 2018-09-26 | Fishing device with bridging plug milling function |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201811124170.5A CN109306853B (en) | 2018-09-26 | 2018-09-26 | Fishing device with bridging plug milling function |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN109306853A CN109306853A (en) | 2019-02-05 |
| CN109306853B true CN109306853B (en) | 2021-04-27 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201811124170.5A Active CN109306853B (en) | 2018-09-26 | 2018-09-26 | Fishing device with bridging plug milling function |
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| Country | Link |
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| CN (1) | CN109306853B (en) |
Families Citing this family (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113309480B (en) * | 2021-07-29 | 2021-10-19 | 中国石油集团川庆钻探工程有限公司 | Anti-sticking milling shoe and drilling, grinding and milling tool for coiled tubing |
| CN116717206B (en) * | 2023-05-30 | 2024-01-23 | 西南石油大学 | Integrated cement sheath crushing and recycling tool and method |
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|---|---|---|---|---|
| CN200949435Y (en) * | 2006-09-13 | 2007-09-19 | 辽河石油勘探局 | Salvaging cup type grind shoe |
| CN101166885A (en) * | 2005-04-28 | 2008-04-23 | 爱尔文工业工具公司 | A drilling tool |
| CN201386523Y (en) * | 2009-04-14 | 2010-01-20 | 中国石化集团胜利石油管理局钻井工艺研究院 | Efficient drilling, grinding and milling integrated tool for well completion of horizontal well |
| WO2012047406A1 (en) * | 2010-09-28 | 2012-04-12 | Baker Hughes Incorporated | Subterranean cutting tool structure tailored to intended use |
| CN203742511U (en) * | 2014-03-11 | 2014-07-30 | 辽河石油勘探局 | Split type fishing cup |
| CN203856439U (en) * | 2014-04-04 | 2014-10-01 | 胜利油田东胜精攻石油开发集团股份有限公司 | Novel milling shoe fishing barrel |
| CN204571895U (en) * | 2014-11-25 | 2015-08-19 | 中国石油集团川庆钻探工程有限公司长庆井下技术作业公司 | A kind of 6 sword flat-bottom grind shoes |
| CN205503068U (en) * | 2016-01-26 | 2016-08-24 | 杰瑞能源服务有限公司 | Bore and grind well workover with five compound wing junk mills |
-
2018
- 2018-09-26 CN CN201811124170.5A patent/CN109306853B/en active Active
Patent Citations (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101166885A (en) * | 2005-04-28 | 2008-04-23 | 爱尔文工业工具公司 | A drilling tool |
| CN200949435Y (en) * | 2006-09-13 | 2007-09-19 | 辽河石油勘探局 | Salvaging cup type grind shoe |
| CN201386523Y (en) * | 2009-04-14 | 2010-01-20 | 中国石化集团胜利石油管理局钻井工艺研究院 | Efficient drilling, grinding and milling integrated tool for well completion of horizontal well |
| WO2012047406A1 (en) * | 2010-09-28 | 2012-04-12 | Baker Hughes Incorporated | Subterranean cutting tool structure tailored to intended use |
| CN203742511U (en) * | 2014-03-11 | 2014-07-30 | 辽河石油勘探局 | Split type fishing cup |
| CN203856439U (en) * | 2014-04-04 | 2014-10-01 | 胜利油田东胜精攻石油开发集团股份有限公司 | Novel milling shoe fishing barrel |
| CN204571895U (en) * | 2014-11-25 | 2015-08-19 | 中国石油集团川庆钻探工程有限公司长庆井下技术作业公司 | A kind of 6 sword flat-bottom grind shoes |
| CN205503068U (en) * | 2016-01-26 | 2016-08-24 | 杰瑞能源服务有限公司 | Bore and grind well workover with five compound wing junk mills |
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| CN109306853A (en) | 2019-02-05 |
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