CN112343533A - Well repairing tool - Google Patents
Well repairing tool Download PDFInfo
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- CN112343533A CN112343533A CN201910721086.XA CN201910721086A CN112343533A CN 112343533 A CN112343533 A CN 112343533A CN 201910721086 A CN201910721086 A CN 201910721086A CN 112343533 A CN112343533 A CN 112343533A
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- milling
- shoe
- hole
- cover plate
- sleeve
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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
- E21B29/00—Cutting or destroying pipes, packers, plugs, or wire lines, located in boreholes or wells, e.g. cutting of damaged pipes, of windows; Deforming of pipes in boreholes or wells; Reconditioning of well casings while in the ground
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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
- E21B31/00—Fishing for or freeing objects in boreholes or wells
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- Engineering & Computer Science (AREA)
- Geology (AREA)
- Mining & Mineral Resources (AREA)
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- Environmental & Geological Engineering (AREA)
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- General Life Sciences & Earth Sciences (AREA)
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- Marine Sciences & Fisheries (AREA)
- Earth Drilling (AREA)
Abstract
The invention provides a well repairing tool, and belongs to the technical field of oil fields. The well repairing tool comprises a milling barrel and a grinding shoe; the sleeve milling barrel comprises a first end and a second end, the first end is provided with a cover plate, the second end is provided with a milling tooth sleeve, one end of the milling tooth sleeve is provided with convex teeth, and the other end of the milling tooth sleeve is connected to the second end; the milling shoe is arranged in the milling barrel, the outer wall of the milling shoe and the inner wall of the milling barrel form a ring cavity, and one end of the milling shoe is connected with the cover plate; when the well is repaired, one side of the cover plate, which is far away from the first end, is connected with the drill rod, the milling tooth sleeve is inserted into an annular channel formed between the oil pipe and the sleeve, and the milling shoe is inserted into the oil pipe. The workover tool provided by the invention can be used for simultaneously treating the oil pipe and the plug in the annular channel, and can be used for improving the dredging efficiency of the oil production well.
Description
Technical Field
The invention relates to the technical field of oil and gas production, in particular to a workover tool.
Background
In the process of oil field production, often can produce the plug in the oil pipe or the annular channel between oil pipe and the sleeve pipe, and influence the exploitation efficiency of oil gas, make oil gas exploitation work unable go on even, consequently, need handle the plug through workover, and then dredge oil pipe and annular channel.
Currently, a plurality of workover tools and different operation modes are adopted to dredge an oil pipe and an annular channel respectively, for example, firstly, a blockage between the oil pipe and a casing pipe is treated by milling; then, the oil production well can be dredged by milling and processing the blockage inside the oil pipe.
However, the above-mentioned working tool and method cannot treat the blockage in the oil pipe and the annular passage, and the working efficiency is low.
Disclosure of Invention
The embodiment of the invention provides a workover tool which can simultaneously treat blockages in an oil pipe and an annular channel and can improve the dredging efficiency of an oil production well.
In order to achieve the purpose, the invention adopts the following technical scheme:
the invention provides a well repairing tool on one hand, which comprises a sleeve milling barrel, a grinding shoe and a milling tooth sleeve; the sleeve milling barrel comprises a first end and a second end, the first end is provided with a cover plate, the second end is provided with the milling tooth sleeve, one end of the milling tooth sleeve is provided with convex teeth, and the other end of the milling tooth sleeve is connected to the second end; the milling shoe is arranged in the milling barrel, the outer wall of the milling shoe and the inner wall of the milling barrel form a ring cavity, and one end of the milling shoe is connected with the cover plate; when the well is repaired, one side of the cover plate, which is far away from the first end, is connected with the drill rod, the milling tooth sleeve is inserted into an annular channel formed between the oil pipe and the sleeve, and the milling shoe is inserted into the oil pipe.
Further, a first through hole and a second through hole are formed in the cover plate; two ends of the first through hole are respectively communicated with the inner cavity of the drill rod and the inner cavity of the grinding shoe; and two ends of the second through hole are respectively communicated with the inner cavity of the drill rod and the annular cavity.
Further, the cover plate comprises an annular side wall for connecting with the milling sleeve; the annular side wall is provided with a first internal thread, and a first end of the milling sleeve is provided with a first external thread matched with the first internal thread; the cover plate is connected to the milling sleeve through a first internal thread and a second internal thread.
Furthermore, the cover plate and the milling sleeve are of an integrated structure.
Furthermore, a first joint and a hydraulic motor which are sequentially connected and provided with a flow passage are arranged between the cover plate and the grinding shoe; one end of an outlet of the hydraulic motor is communicated with an inner cavity of the grinding shoe, and an inlet of the hydraulic motor is communicated with a flow passage of the first joint; the runner of the first joint is communicated with the first through hole.
Furthermore, the first through holes are located in the center of the cover plate, and the number of the second through holes is multiple; the plurality of second through holes are uniformly distributed along the circumferential direction of the first through hole.
Further, the second through hole is a circular hole or an arc hole.
Further, a releasing nipple is arranged between the drill rod and the cover plate; one end of the inner cavity of the releasing sub is communicated with the inner cavity of the drill rod, and the inner cavity of the releasing sub is communicated with the first through hole and the second through hole respectively.
Furthermore, the number of the milling sleeves is multiple, and the milling sleeves are connected through screw threads.
Further, the milling shoe is any one of a flat-bottom milling shoe, a pear-shaped milling shoe, a milling cone and a milling column.
Compared with the prior art, the well repairing tool provided by the invention has the following advantages;
the well repairing tool comprises a cover plate, wherein one side of the cover plate is connected with a drill rod, a milling sleeve and a grinding shoe are fixed on the other side of the drill rod, and the grinding shoe is arranged in the milling sleeve and forms an annular cavity; when the workover operation is carried out on the oil production well, a sleeve milling barrel of the workover tool is sleeved on an oil pipe, so that a grinding shoe of the workover tool is positioned in the oil pipe, and a milling tooth sleeve is positioned in an annular channel between the sleeve and the oil pipe; the drill rod is rotated to drive the grinding shoe to treat the blockage in the oil pipe, and simultaneously, the milling tooth sleeve at one end of the milling sleeve can be driven to treat the blockage of the annular channel. Compared with the prior art, the workover tool provided by the invention can be used for simultaneously removing the blockage in the oil pipe and the blockage in the annular channel, and is convenient and quick and high in operation efficiency.
In addition to the technical problems addressed by the present invention, the technical features constituting the technical solutions and the advantages brought by the technical features of the technical solutions described above, other technical problems solved by the workover tool of the present invention, other technical features included in the technical solutions and advantages brought by the technical features will be further explained in detail in the detailed description of the embodiments.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments of the present invention or the prior art will be briefly described below, it is obvious that the drawings in the following description are only a part of the embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to the drawings without creative efforts.
FIG. 1 is a schematic diagram of a construction of a workover tool according to an embodiment of the present invention;
FIG. 2 is a schematic view of a work-over tool according to an embodiment of the present invention;
fig. 3 is a schematic position diagram of a first through hole and a second through hole according to an embodiment of the present invention;
FIG. 4 is a top view of the cover plate of FIG. 3;
FIG. 5 is a cross-sectional view of the cover plate of FIG. 3;
FIG. 6 is a schematic view of the installation of a first connector and a hydraulic motor according to an embodiment of the present invention;
fig. 7 is a schematic mounting diagram of the releasing sub provided in the embodiment of the present invention.
Description of reference numerals:
10-sleeving a milling cylinder;
20-cover plate;
21-a first via;
22-a second via;
23-an annular side wall;
30-milling a gear sleeve;
40-grinding the shoe;
50-a first joint;
60-a hydraulic motor;
70-releasing nipple;
100-a workover tool;
200-a drill pipe;
300-oil pipe;
400-sleeve.
Detailed Description
In order to make the aforementioned objects, features and advantages of the present invention comprehensible, embodiments accompanied with figures are described in detail below. It is to be understood that the described embodiments are merely a few embodiments of the invention, and not all embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
In the description of the present invention, it is to be understood that the terms "central," "longitudinal," "lateral," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "clockwise," "counterclockwise," "axial," "radial," "circumferential," and the like are used in the orientations and positional relationships indicated in the drawings for convenience in describing the invention and to simplify the description, and are not intended to indicate or imply that the referenced devices or elements must have a particular orientation, be constructed and operated in a particular orientation, and are therefore not to be considered limiting of the invention.
Furthermore, the terms "first", "second" and "first" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one such feature. In the description of the present invention, "a plurality" means at least two, e.g., two, three, etc., unless specifically limited otherwise.
Fig. 1 is a schematic structural diagram of a workover tool according to an embodiment of the present invention; fig. 2 is a schematic diagram of a workover operation state according to the embodiment.
As shown in fig. 1 and 2, a workover tool 100 according to an embodiment of the present invention includes a milling sleeve 10, a shoe 40, and a gear milling sleeve 30; the sleeve milling barrel 10 comprises a first end and a second end, wherein the first end is provided with a cover plate 20, the second end is provided with a milling tooth sleeve 30, one end of the milling tooth sleeve 30 is provided with convex teeth, and the other end of the milling tooth sleeve is connected to the second end; the milling shoe 40 is arranged in the milling barrel 10, the outer wall of the milling shoe 40 and the inner wall of the milling barrel 10 form an annular cavity, and one end of the milling shoe 40 is connected with the cover plate 20; when the well is to be repaired, the side of the cover plate 20 facing away from the first end is connected to the drill rod 200, the gear milling sleeve 30 is inserted into the annular channel formed between the oil pipe 300 and the casing 400, and the grinding shoe 40 is inserted into the oil pipe 300.
Specifically, the milling sleeve 10 may have an annular structure and an inner cavity, and includes a first end and a second end disposed opposite to each other, a cover plate 20 is disposed at the first end of the milling sleeve 10, and the cover plate 20 may seal the first end. The cover plate 20 may be threaded or welded onto the first end; illustratively, the cover plate 20 and the first end of the milling sleeve 10 are integrally formed by die casting, and the cover plate 20 and the milling sleeve 10 are manufactured into an integral structure, so that the connection strength between the cover plate 20 and the milling sleeve 10 can be improved, and the drill rod 200 and the milling shoe 40 can be stably connected to the cover plate 20.
Alternatively, as shown in FIG. 5; the outer wall of first end is provided with first external screw thread, and one side of apron 20 is provided with annular lateral wall 23 in order to form the lid form casing, is provided with the external screw thread with first external screw thread matched with at the internal surface of its annular lateral wall 23, and apron 20 cup joints the first end at a milling sleeve 10 through its annular lateral wall 23 to through first internal thread and second internal thread fastening.
A milling tooth sleeve 30 is arranged at the second end of the milling sleeve 10, the milling tooth sleeve 30 is used for grinding a blocking object between the oil pipe 300 and the sleeve 400, the milling tooth sleeve 30 is of an annular structure, a plurality of convex teeth are uniformly distributed at one end of the milling tooth sleeve 30 along the circumferential direction of the milling tooth sleeve, and the tooth direction of the convex teeth is consistent with the axial direction of the milling tooth sleeve 30; one end of the gear sleeve 30 can be sleeved on the second end of the milling barrel 10 and fixed by screw thread or pin, and the combination scheme of screw thread and pin. When the well repairing operation is carried out, the milling sleeve 10 can be sleeved on the upper end of the oil pipe 300, and the annular gear milling sleeve 30 can extend into the space between the oil pipe 300 and the casing 400 so as to drill and grind the blockage in the annular channel formed between the oil pipe 300 and the casing 400.
In the embodiment, the milling shoe 40 is disposed in the inner cavity of the milling barrel 10, one end of the milling shoe 40 is connected to the portion of the cover plate 20 located in the milling barrel 10, the outer wall of the milling shoe 40 and the inner wall of the milling barrel 10 form an annular cavity, and the oil pipe 300 can be sleeved in the annular cavity, that is, one end of the oil pipe 300 is inserted and fixed between the milling shoe 40 and the milling barrel 10. When performing workover operations, the grind shoe 40 is inserted into the tubing 300 and the grind shoe 40 rotates with the drill pipe 200, the rotation of the grind shoe 40 being able to drill a blockage in the tubing 300. It is understood that the milling shoe 40 in the present embodiment may be any one of a flat bottom milling shoe 40, a pear-shaped milling shoe 40, a milling cone, and a milling column, and may be selected autonomously according to the working conditions.
The cover plate 20 is used for connecting the milling sleeve 10 and the milling shoe 40 with the bottom of the drill rod 200, the bottom of the drill rod 200 can be provided with threads, and then the cover plate 20 can be provided with connecting threads matched with the threads at the bottom of the drill rod 200; of course, the cover plate 20 may also be provided with a connection joint so as to be connected with the bottom of the drill rod 200 through the connection joint, and the embodiment of the present invention is not particularly limited thereto.
The drill rod 200 is used for extending the milling sleeve 10 between the oil pipe 300 and the casing 400 and driving the milling tooth sleeve 30 connected with the second end of the milling sleeve 10 so as to drill and mill the blockage in the annular channel; meanwhile, the drill rod 200 is also used for extending the milling shoe 40 into the oil pipe 300 and driving the milling shoe 40 to rotate so as to drill and mill the blockage in the oil pipe 300; it will be appreciated that drill pipe 200 is a steel pipe with threads on the bottom for connecting rig surface equipment to drilling and milling equipment at the bottom of the well. The original purpose of the drill pipe 200 is to carry drilling mud to the drill bit and raise and lower it with the drill bit. In the embodiment, the workover tool 100 is connected with the bottom of the drill rod 200, so that the blockage in the oil pipe 300 and the blockage between the oil pipe 300 and the casing 400 are simultaneously drilled and ground, the operation is convenient and fast, and the operation efficiency is improved.
When the workover tool 100 provided by the embodiment is used for workover operation, the rotary table at the wellhead is started and the drill rod 200 is driven to rotate, so that the milling tooth sleeve 30 and the grinding shoe 40 at the second end of the milling sleeve 10 follow up, and the rotating milling tooth sleeve 30 removes a blockage between the oil pipe 300 and the casing 400; while the rotating grind shoe 40 clears the blockage in the tubing 300. In this embodiment, the workover tool 100 can drill and grind the plug in the oil pipe 300 and the plug in the annular channel between the oil pipe 300 and the casing 400 at the same time, which is not only convenient and fast, but also improves the operation efficiency.
Fig. 3 is a schematic position diagram of the first through hole and the second through hole provided in the present embodiment; fig. 4 is a top view of the cover plate provided in the present embodiment; fig. 5 is a sectional view of a cover plate provided in the embodiment.
As shown in fig. 3 to 5, the cover plate 20 is provided with a first through hole 21 and a second through hole 22; two ends of the first through hole 21 are respectively communicated with the inner cavity of the drill rod 200 and the inner cavity of the milling shoe 40; the two ends of the second through hole 22 are respectively communicated with the inner cavity and the annular cavity of the drill rod 200.
Specifically, the cover plate 20 is provided with a first through hole 21, and two ends of the first through hole 21 respectively correspond to the inner cavity of the drill rod 200 and the inner cavity of the milling shoe 40, that is, the inner cavity of the drill rod 200 is communicated with the inner cavity of the milling shoe 40 through the first through hole 21; the cover plate 20 is further provided with a second through hole 22, and two ends of the second through hole 22 respectively correspond to the inner cavity and the annular cavity of the drill rod 200, that is, the inner cavity of the drill rod 200 is communicated with the annular cavity through the second through hole 22; it can be seen that two fluid paths are formed between the drill pipe 200 and the workover tool 100, the first being: the inner cavity of the drill rod 200, the first through hole 21 and the inner cavity of the milling shoe 40, and the second fluid passage is: the inner cavity of the drill rod 200, the second through hole 22, and the annular cavity.
Rotating the drill rod 200, drilling and grinding the plug between the oil pipe 300 and the casing 400 through the milling tooth sleeve 30 connected to the second end of the milling barrel 10, and simultaneously drilling and grinding the plug in the oil pipe 300 through the grinding shoe 40; while drilling and grinding operations are carried out, flushing liquid is injected into the drill rod 200, and then the inner cavity and the annular cavity of the oil pipe 300 are respectively flushed by the flushing liquid through the two fluid channels; specifically, the inner cavity of the drill rod 200 is filled with flushing fluid, the fluid is divided into two parts after flowing to the cover plate 20, one part enters the inner cavity of the milling shoe 40 through the first through hole 21 and then enters the oil pipe 300 and flushes the inner cavity of the inner oil pipe 300, and the other part enters the annular cavity through the second through hole 22 and then enters the annular channel between the oil pipe 300 and the casing 400 to flush the annular channel.
This embodiment drills through milling the plug between tooth cover 30 to oil pipe 300 and sleeve pipe 400 to drill through the plug of junk mill 40 in to oil pipe 300 and grind, then, the piece that the flush fluid got into first fluid passage and drills and grinds in to oil pipe 300 washes, and simultaneously, the piece that the flush fluid got into second fluid passage and drills and grinds in to oil pipe 300 and sleeve pipe 400 washes, the treatment effeciency of plug has been promoted, and make behind the workover operation of well workover tool 100, reach more unblocked in the oil pipe 300 and between oil pipe 300 and the sleeve pipe 400.
Referring to fig. 4, the first through hole 21 is located at the center of the cover plate 20, and the number of the second through holes 22 is plural; the plurality of second through holes 22 are uniformly distributed along the circumferential direction of the first through hole 21. Specifically, the number of the first through holes 21 in the present embodiment is 1, but the number of the first through holes 21 may be plural, but in order to reduce the manufacturing process and the complexity of the manufacturing, the number of the first through holes 21 in the present embodiment is 1, and the first through holes 21 are located at the center of the cover plate 20. In addition, the cover plate 20 is further provided with a plurality of second through holes 22, the plurality of second through holes 22 may be disposed around the first through holes 21, and the plurality of second through holes 22 are circumferentially and uniformly disposed around the first through holes 21. It is understood that the first through hole 21 may be a circular hole, a square hole, or other shapes; similarly, the second through hole 22 may be a circular hole, an arc hole, or a hole with other shapes, and the shapes of the first through hole 21 and the second through hole 22 are not limited in this embodiment.
Fig. 6 is an installation schematic diagram of the first joint and the hydraulic motor provided in this embodiment.
As shown in fig. 6, in the present embodiment, a first joint 50 having a flow passage and a hydraulic motor 60 are provided between the cover plate 20 and the grind shoe 40 in sequence; one end of the outlet of the hydraulic motor 60 is communicated with the inner cavity of the milling shoe 40, and the inlet of the hydraulic motor 60 is communicated with the flow passage of the first joint 50; the flow passage of the first joint 50 communicates with the first through hole 21.
Specifically, a first connector 50 with a flow passage is arranged at the position where the cover plate 20 is connected with the grinding shoe 40, the first connector 50 is used for fixing the hydraulic motor 60 on the cover plate 20, and the hydraulic motor 60 can drive the grinding shoe 40 to rotate; wherein, one end of the first joint 50 is connected with the cover plate 20, and the flow passage of the first joint 50 is communicated with the first through hole 21, the other end of the first joint 50 is connected with the hydraulic motor 60, and the flow passage of the first joint 50 is communicated with the inlet of the hydraulic motor 60, and the outlet of the hydraulic motor 60 is communicated with the inner cavity of the milling shoe 40. When liquid flows through the hydraulic motor 60, the hydraulic energy of the hydraulic motor 60 is converted into the rotational energy of the rotor on the hydraulic motor 60, so that the grinding shoe 40 connected with the hydraulic motor 60 is driven to rotate, the drilling and grinding of the blockage in the oil pipe 300 can be accelerated, and the drilling and grinding efficiency is improved.
Fig. 7 is a schematic mounting diagram of the releasing sub provided in the embodiment.
As shown in fig. 7, a release sub 70 is disposed between the drill pipe 200 and the cover plate 20, one end of the inner cavity of the release sub 70 is communicated with the inner cavity of the drill pipe 200, and the inner cavity of the release sub 70 is respectively communicated with the first through hole 21 and the second through hole 22. Specifically, the phenomenon of sticking to the drill pipe can appear in the drilling rod 200 operation process, and in order to take out drilling rod 200, often arranged at the bottom of drilling rod 200 has throw-off nipple 70, and throw-off nipple 70 is connected with drilling rod 200 through the pin, and in case the phenomenon of sticking to the drill pipe appears, rotatory drilling rod 200 or lift drilling rod 200, can cut the pin between throw-off nipple 70 and drilling rod 200 to take out drilling rod 200. It will be appreciated that to maintain drill pipe 200 with flushing fluid injected into tubing 300 and the annulus, the release sub 70 has an internal cavity with one end communicating with the internal cavity of drill pipe 200 and the other end communicating with the first and second through holes 21, 22.
In this embodiment, the number of the milling sleeves 10 is plural, and the plurality of milling sleeves 10 are connected by screw threads. Specifically, in order to treat the blockage of the annular channel between the oil pipe 300 and the casing 400 at a deeper position, the blockage can be treated by replacing the milling sleeves 10 with longer length, or the number of milling sleeves 10 can be increased, for example, the number of milling sleeves 10 is multiple, and the milling sleeves 10 are connected by screw threads; likewise, to address a blockage deeper within tubing 300, a plurality of first joints 50 may be added between cover plate 20 and hydraulic motor 60.
In the description herein, references to the description of the term "one embodiment," "some embodiments," "an example," "a specific example," or "some examples," etc., mean that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the invention. In this specification, the schematic representations of the terms used above are not necessarily intended to refer to the same embodiment or example. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples. Furthermore, various embodiments or examples and features of different embodiments or examples described in this specification can be combined and combined by one skilled in the art without contradiction.
Finally, it should be noted that: the above embodiments are only used to illustrate the technical solution of the present invention, and not to limit the same; while the invention has been described in detail and with reference to the foregoing embodiments, it will be understood by those skilled in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some or all of the technical features may be equivalently replaced; and the modifications or the substitutions do not make the essence of the corresponding technical solutions depart from the scope of the technical solutions of the embodiments of the present invention.
Claims (10)
1. A well repairing tool is characterized by comprising a milling barrel and a grinding shoe;
the sleeve milling barrel comprises a first end and a second end, the first end is provided with a cover plate, the second end is provided with a milling tooth sleeve, one end of the milling tooth sleeve is provided with convex teeth, and the other end of the milling tooth sleeve is connected to the second end;
the milling shoe is arranged in the milling barrel, the outer wall of the milling shoe and the inner wall of the milling barrel form a ring cavity, and one end of the milling shoe is connected with the cover plate;
when the well is repaired, one side of the cover plate, which is far away from the first end, is connected with the drill rod, the milling tooth sleeve is inserted into an annular channel formed between the oil pipe and the sleeve, and the milling shoe is inserted into the oil pipe.
2. The workover tool of claim 1, wherein the cover plate is provided with a first through-hole and a second through-hole;
two ends of the first through hole are respectively communicated with the inner cavity of the drill rod and the inner cavity of the grinding shoe;
and two ends of the second through hole are respectively communicated with the inner cavity of the drill rod and the annular cavity.
3. The workover tool of claim 2 wherein the cover plate includes an annular sidewall for connection with the casing milling barrel;
the annular side wall is provided with a first internal thread, and a first end of the milling sleeve is provided with a first external thread matched with the first internal thread;
the cover plate is connected to the milling sleeve through a first internal thread and a second internal thread.
4. The workover tool of claim 2, wherein the cover plate is of unitary construction with the casing barrel.
5. The workover tool of claim 2 wherein a first joint having a flow passage and a hydraulic motor connected in series are provided between the cover plate and the mill shoe;
one end of an outlet of the hydraulic motor is communicated with an inner cavity of the grinding shoe, and an inlet of the hydraulic motor is communicated with a flow passage of the first joint;
the runner of the first joint is communicated with the first through hole.
6. The workover tool of claim 2, wherein the first through-hole is located in the center of the cover plate, and the second through-hole is plural in number;
the plurality of second through holes are uniformly distributed along the circumferential direction of the first through hole.
7. The workover tool of claim 6, wherein the second through-hole is a circular hole or an arcuate hole.
8. The workover tool of claim 2, wherein a release sub is disposed between the drill pipe and the cover plate;
one end of the inner cavity of the releasing sub is communicated with the inner cavity of the drill rod, and the inner cavity of the releasing sub is communicated with the first through hole and the second through hole respectively.
9. The well intervention tool of any of claims 1-8, wherein the number of the milling sleeves is plural, and the plurality of milling sleeves are connected by a screw thread.
10. The well servicing tool of any of claims 1-8, wherein the mill shoe is any of a flat-bottom mill shoe, a pear-shaped mill shoe, a milling cone, a milling post.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910721086.XA CN112343533A (en) | 2019-08-06 | 2019-08-06 | Well repairing tool |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910721086.XA CN112343533A (en) | 2019-08-06 | 2019-08-06 | Well repairing tool |
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| CN112343533A true CN112343533A (en) | 2021-02-09 |
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| CN201910721086.XA Pending CN112343533A (en) | 2019-08-06 | 2019-08-06 | Well repairing tool |
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