CN216950299U

CN216950299U - Milling fishing device

Info

Publication number: CN216950299U
Application number: CN202220189936.3U
Authority: CN
Inventors: 唐本顺; 周在翔; 彭武斌; 李志刚; 潘业鹏; 王雷
Original assignee: China Petroleum and Chemical Corp
Current assignee: China Petroleum and Chemical Corp
Priority date: 2022-01-24
Filing date: 2022-01-24
Publication date: 2022-07-12
Anticipated expiration: 2032-01-24

Abstract

The utility model belongs to the technical field of downhole well repairing tools, and particularly relates to a grinding and milling fishing device which comprises an outer barrel, wherein the upper end of the outer barrel is provided with an upper connector, the upper connector is used for being connected with a pipe column, and the lower end of the outer barrel is provided with grinding teeth for grinding and milling downhole falling objects when the outer barrel rotates; an elastic salvaging claw is arranged in the outer cylinder, extends upwards from the inner wall of the outer cylinder towards the central axis in an inclined way, and is used for allowing falling objects to enter and supporting and salvaging the falling objects; the fishing device is characterized in that the elastic fishing claws comprise a first elastic fishing claw and a second elastic fishing claw which are sequentially arranged along the vertical direction, the first elastic fishing claw and the second elastic fishing claw are respectively provided with a plurality of claws along the circumferential direction of the outer barrel, the circumferential interval between the first elastic fishing claws is smaller than the circumferential interval between the second elastic fishing claws, and the hole opening which is formed by the first elastic fishing claws and is used for allowing falling objects to pass through is smaller than the hole opening which is formed by the second elastic fishing claws and is used for allowing falling objects to pass through.

Description

Milling fishing device

Technical Field

The utility model belongs to the technical field of underground fishing devices, and particularly relates to a grinding and milling fishing device.

Background

Among the oil development process, appear in the pit that the packer can't the deblocking lift, corrode when the oil pipe can't lift and other unable directly salvaged junk, generally need mill the underground junk, mill the in-process and can produce a large amount of iron plates, cubic objects such as alloy piece, under the ideal situation, iron plate, alloy piece can directly drop in the shaft bottom, but discover when in-service use, a lot of cubic object cards can't drop in milling department, lead to the grinding teeth of milling operation to carry out the secondary milling to cubic object, milling efficiency is lower. In the prior art, most of the working procedures are that a milling tool is firstly put into a well to mill falling objects, then the milling tool is lifted upwards, and then a fishing tool is put downwards, so that the working procedures are complicated, and the working time is long; moreover, most of the fishing tools in the prior art only salvage large fallen objects such as oil pipes, packers and bridge plugs, and can not salvage milled massive objects.

Therefore, the chinese utility model patent with the granted publication number CN214403504U designs a barrel-type junk mill fishing tool, which comprises a milling barrel, the lower end of the milling barrel is provided with milling teeth, the middle of the milling barrel is rotatably provided with a fishing spear body, the fishing spear body is provided with a sliding groove, a slip block is slidably arranged in the sliding groove, during use, the fishing spear body extends into the junk and salvages the junk by the slip block, and the milling barrel mills the junk. The prior art casing milling fishing tool for the barrel type junk integrates casing milling and fishing, but the fishing spear body can only fish out the large junk such as oil pipes, packers, bridge plugs and the like.

Then like the chinese utility model patent of the publication number CN203879437U, provide a set milling fishing device, including the urceolus, the upper end of urceolus is equipped with the top connection, and the bottom of urceolus is equipped with the grinding tooth (being the alloy-layer in this patent), and the inner tube is installed to the urceolus internal rotation, and the inner tube lower extreme supports on the annular boss of urceolus, and the inner tube upper end is compressed tightly by the top connection. An elastic salvaging claw (namely a one-way baffle in the patent) is arranged on the inner cylinder, and the elastic salvaging claw extends from the inner wall of the inner cylinder towards the central axis and upwards in an inclined way. When the device is used, the grinding teeth grind and mill the fallen objects in the well, the small fallen objects formed after grinding and milling enter the outer barrel, when the small fallen objects enter the outer barrel, the fallen objects are pressed against the elastic fishing claw to swing, and after the elastic fishing claw upwards passes through the elastic fishing claw, the elastic fishing claw swings back to support the fallen objects to prevent the fallen objects from falling again.

The casing milling and fishing device in the prior art can mill and salvage objects falling in the well, can salvage the objects falling in small parts, but still has certain disadvantages in actual use: the bulk object that the underground junk formed after being milled is not of uniform size, and the bulk object size that prior art's elasticity was salvaged the claw and can be salvaged is the definite value, is less than the bulk object of this definite value and can't be salvaged, leads to still to have the bulk object to remain in the pit, still can exert an influence to milling effect and milling efficiency. However, if the gap between the elastic fishing claws is reduced, a large block-shaped object is not easy to pass through, or the resistance applied when the block-shaped object passes through is large, which results in a failed fishing.

SUMMERY OF THE UTILITY MODEL

The utility model aims to provide a milling fishing device, which aims to solve the technical problem that the size of a block-shaped object which can be fished by an elastic fishing claw of the milling fishing device in the prior art is constant.

In order to achieve the purpose, the technical scheme of the grinding and milling fishing device provided by the utility model is as follows: a grinding and milling fishing device comprises an outer barrel, wherein an upper joint is arranged at the upper end of the outer barrel and used for being connected with a pipe column, and grinding teeth are arranged at the lower end of the outer barrel and used for grinding and milling underground falling objects when the outer barrel rotates; an elastic salvaging claw is arranged in the outer cylinder, extends upwards from the inner wall of the outer cylinder towards the central axis in an inclined way, and is used for allowing falling objects to enter and supporting and salvaging the falling objects; the fishing device is characterized in that the elastic fishing claws comprise a first elastic fishing claw and a second elastic fishing claw which are sequentially arranged along the vertical direction, the first elastic fishing claw and the second elastic fishing claw are respectively provided with a plurality of claws along the circumferential direction of the outer barrel, the circumferential interval between the first elastic fishing claws is smaller than the circumferential interval between the second elastic fishing claws, and the hole opening which is formed by the first elastic fishing claws and is used for allowing falling objects to pass through is smaller than the hole opening which is formed by the second elastic fishing claws and is used for allowing falling objects to pass through.

The beneficial effects are that: the utility model provides a milling and fishing device, wherein an upper joint for connecting a pipe column is arranged at the upper end of an outer cylinder, the rotating pipe column can drive the outer cylinder to rotate through the upper joint, and then grinding teeth at the lower end of the outer cylinder mill falling objects below the outer cylinder, and elastic fishing claws in the outer cylinder can expand outwards towards the direction of the outer cylinder when the falling objects pass through along with reverse circulating liquid to avoid the falling objects and can also retract inwards when the falling objects descend relative to the outer cylinder to block the falling objects in the outer cylinder, so that the aim of fishing is fulfilled. Make this mill fishing device can salvage more tiny junk, and first elasticity is salvaged claw and second elasticity and is salvaged the claw and be applicable to not unidimensional cubic object, can classify and salvage, improves and salvages the effect. In fact, the second elastic salvaging claw can also salvage the large falling object with steps.

As a further improvement, a conical guide cylinder with a small upper part and a large lower part is arranged in the outer cylinder, the lower end of the conical guide cylinder is fixed on the inner wall of the outer cylinder, and the first elastic fishing claw is arranged on the conical guide cylinder.

The beneficial effects are that: because the inner diameter of the conical guide cylinder is smaller than that of the outer cylinder, the upper end surfaces of the first elastic salvaging claws arranged on the conical guide cylinder are closer, and the falling objects with smaller volume can be salvaged; the conical guide cylinder can guide small falling objects, can also block the falling objects with relatively large volume, and avoids the blockage between the falling objects with large volume and the first elastic fishing claw.

As a further improvement, the first elastic salvaging claw is welded on the conical guide cylinder.

The beneficial effects are that: adopt the welded mode to connect first elasticity fishing claw on the toper guide cylinder, not only connect simply, the welded mode can be in the same place the lower extreme of first elasticity fishing claw and the fusing of toper guide cylinder moreover, can guarantee joint strength, difficult rupture.

As a further improvement, the first elastic catch is connected to the upper end face of the conical guide cylinder.

The beneficial effects are that: the first elastic salvaging claw is welded on the upper end surface of the conical guide cylinder, and the welding is convenient.

As a further improvement, the outer cylinder comprises a collecting cylinder and a capturing cylinder which are sequentially connected in a threaded manner from top to bottom, the upper joint is arranged on the collecting cylinder, and the lower end of the conical guide cylinder is connected to the capturing cylinder.

The beneficial effects are that: the outer cylinder is arranged in a split manner, so that the depth of each section of cylinder body is relatively small, and the conical guide cylinder can conveniently extend into the capturing cylinder and is welded with the capturing cylinder.

As a further improvement, the lower end of the conical guide cylinder is welded on the inner wall of the capture cylinder.

The beneficial effects are that: the conical guide cylinder is connected to the inner wall of the capturing cylinder in a welding mode, so that the connection strength between the conical guide cylinder and the capturing cylinder can be guaranteed, and the phenomenon that the falling object is broken due to upward movement is avoided.

As a further improvement, the outer cylinder further comprises a fishing cylinder, the fishing cylinder is in threaded connection below the capturing cylinder, external threads are arranged at the upper end and the lower end of the capturing cylinder, internal threads are arranged at the lower end of the collecting cylinder and the upper end of the fishing cylinder, two ends of the capturing cylinder are connected with the collecting cylinder and the fishing cylinder, and the outer wall surfaces of the collecting cylinder, the capturing cylinder and the fishing cylinder are parallel and level.

The beneficial effects are that: the outer cylinder is arranged in three sections, so that the depth of each section of cylinder body can be reduced, and the assembly of the conical guide cylinder is facilitated; the outer walls of the collecting barrel, the capturing barrel and the fishing barrel are arranged in parallel and level, so that steps can be prevented from being formed on the outer wall of the outer barrel, and the outer pipe is prevented from being buried in a well bottom by falling objects.

As a further improvement, the second elastic fishing claw is sequentially arranged at intervals in the vertical direction to form at least two layers.

The beneficial effects are that: at least two-layer elasticity is salvaged the claw and not only can be to entering into the junk formation multilayer shutoff in the urceolus, compares in the individual layer second elasticity and salvages the claw and support alone the junk, and two-layer or two-layer more than second elasticity are salvaged the claw and can be supported the junk jointly, avoid the junk to salvage the claw conquassation with the second elasticity, are favorable to improving the reliability of milling fishing device.

As a further improvement, the first elastic salvaging claw and the second elastic salvaging claw are directly or indirectly and separately fixedly arranged on the wall of the outer cylinder.

The beneficial effects are that: the outer cylinder is a closed cylinder body, so that reverse circulation liquid can be prevented from leaking; the first elastic salvaging claw and the second elastic salvaging claw are assembled with the outer cylinder in a split way, and an additional connecting structure is not required to be arranged on the inner wall of the outer cylinder, so that the outer cylinder is convenient to manufacture and form.

As a further improvement, the grinding teeth are alloy blocks welded at the bottom of the outer cylinder.

The beneficial effects are that: the hardness of alloy piece is higher for most metals, consequently, and the grinding tooth is the alloy material, can enough improve the milling speed to the junk, can also improve this milling fishing device's application scope.

Drawings

Fig. 1 is a schematic structural diagram of the milling fishing device provided by the utility model.

Description of reference numerals: 1. an outer cylinder; 2. an upper joint; 3. a small diameter section; 4. a collection canister; 5. a capturing cylinder; 6. an upper extension cylinder; 7. a lower extension cylinder; 8. a tapered guide barrel; 9. a first elastic salvaging claw; 10. an overshot; 11. a second elastic salvaging claw; 12. and grinding the teeth.

Detailed Description

In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention is described in further detail below with reference to the accompanying drawings and embodiments. It should be understood that the detailed description and specific examples, while indicating the preferred embodiment of the utility model, are intended for purposes of illustration only and are not intended to limit the scope of the utility model. The components of embodiments of the present invention generally described and illustrated in the figures herein may be arranged and designed in a wide variety of different configurations.

Thus, the following detailed description of the embodiments of the present invention, as presented in the figures, is not intended to limit the scope of the utility model, as claimed, but is merely representative of selected embodiments of the utility model. All other embodiments, which can be derived by a person skilled in the art from the embodiments of the present invention without making any creative effort, shall fall within the protection scope of the present invention.

It is to be noted that, in the embodiments of the present invention, relational terms such as "first" and "second", and the like, which may be present in the embodiments, are only used for distinguishing one entity or operation from another entity or operation, and do not necessarily require or imply that such actual relationships or orders between the entities or operations exist. Also, terms such as "comprises," "comprising," or any other variation thereof, which may be present, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus. Without further limitation, the appearances of the phrase "comprising an … …" or similar limitation may be present without necessarily excluding the presence of additional identical elements in the process, method, article, or apparatus that comprises the same elements.

In the description of the present invention, unless otherwise explicitly specified or limited, terms such as "mounted," "connected," and "connected" that may be present are to be construed broadly, e.g., as a fixed connection, a releasable connection, or an integral connection; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be connected internally or indirectly to each other. The specific meaning of the above terms in the present invention can be understood by those skilled in the art from specific situations.

In the description of the present invention, unless otherwise specifically stated or limited, the term "provided" may be used in a broad sense, for example, the object of "provided" may be a part of the main body, or may be arranged separately from and connected to the main body, and the connection may be detachable or non-detachable. The specific meaning of the above terms in the present invention can be understood by those skilled in the art from specific situations.

The present invention will be described in further detail with reference to examples.

Embodiment 1 of the milling fishing device provided in the present invention:

as shown in fig. 1, the milling fishing device comprises an outer cylinder 1, wherein the upper end of the outer cylinder 1 is provided with an upper joint 2 for connecting with a pipe column; the lower end of the outer cylinder 1 is provided with grinding teeth 12 for milling falling objects in the well.

The outer cylinder 1 consists of three cylinder bodies, namely a collecting cylinder 4, a capturing cylinder 5 and an overshot 10.

All be equipped with the internal thread on the section of thick bamboo inner wall of collecting vessel 4 upper end and lower extreme, the lower extreme of top connection 2 is equipped with path section 3, is equipped with the external screw thread on the outer peripheral face of path section 3 to the spiral assembly is in the upper end of collecting vessel 4.

Catch a section of thick bamboo 5 and be located the below of surge drum 4, catch a section of thick bamboo 5 and include main barrel section, the upper end of main barrel section is equipped with upside and extends a section of thick bamboo 6, and the external diameter that the upside extended a section of thick bamboo 6 is less than the external diameter of main barrel section, is equipped with the external screw thread on the outer peripheral face of upside extension section of thick bamboo 6 to the lower extreme of spiral insertion surge drum 4. The lower extreme of main barrel section is equipped with the downside and extends a section of thick bamboo 7, and the outside diameter that the downside extended a section of thick bamboo 7 is unanimous with the outside diameter that the upside extended a section of thick bamboo 6, and the downside extends and is equipped with the external screw thread on the outer peripheral face of a section of thick bamboo 7 to in the spiral inserts overshot 10, and then make the surge drum 4, catch a section of thick bamboo 5 and overshot 10 and connect the back, three's outer peripheral face parallel and level.

The main cylinder section of the capturing cylinder 5 is internally provided with a conical guide cylinder 8, the conical guide cylinder 8 is integrally conical, the outer diameter of the conical guide cylinder gradually shrinks from bottom to top, and the outer peripheral surface of the lower end of the conical guide cylinder 8 is welded on the inner wall of the main cylinder section.

Be equipped with first elasticity fishing claw 9 on the upper end border of toper guide cylinder 8, first elasticity fishing claw 9 is triangle-shaped, and be equipped with a plurality ofly along the circumference on upper end border, each first elasticity fishing claw 9 all extends along upper and lower direction, and incline towards central axis by the section of thick bamboo inner wall of main barrel section, so that each first elasticity fishing claw 9 expands outward when the junk passes through, dodge the junk, each first elasticity fishing claw 9 can be pressed down by the junk and adducted, make the upper end of each first elasticity fishing claw 9 be close to each other in order to support the junk, avoid getting into the junk whereabouts in the collecting vessel 4.

The inner wall of the upper end of the overshot 10 is provided with an internal thread to be screw-fitted with the lower extension cylinder 7. Two layers of second elastic fishing claws 11 are arranged on the inner wall of the fishing cylinder 10, each layer of second elastic fishing claws 11 is provided with a plurality of second elastic fishing claws 11, each second elastic fishing claw 11 extends along the vertical direction and inclines towards the central axis from the inner wall of the fishing cylinder 10, so that each second elastic fishing claw 11 expands outwards when falling objects pass through, the falling objects are avoided, each second elastic fishing claw 11 can be pressed downwards and contracted by the falling objects, the upper ends of the second elastic fishing claws 11 are close to each other to support the falling objects, and the falling objects above the second elastic fishing claws 11 are prevented from falling. Moreover, the hole surrounded by the first elastic fishing claws 9 for the falling objects to pass through is smaller than the hole surrounded by the second elastic fishing claws 11 for the falling objects to pass through, and the circumferential interval between the first elastic fishing claws 9 is smaller than the circumferential interval between the second elastic fishing claws 11, so that the falling objects which enter the collecting cylinder 4 and have relatively small volume are prevented from falling through the first elastic fishing claws 9.

The edge of the bottom end of the overshot 10 is provided with a plurality of grinding teeth 12, the grinding teeth 12 are arranged along the circumferential direction of the edge of the bottom end of the overshot 10, and each grinding tooth 12 is a triangular alloy block and is used for grinding and milling falling objects in a well when the outer cylinder 1 rotates.

When the falling objects are fished, the upper connector 2 is connected with a pipe column, the milling fishing device is lowered into a well through the pipe column, when the milling fishing device stops descending, the grinding teeth 12 are indicated to be in contact with the falling objects in the well, a driving device connected with the pipe column is started, the pipe column is driven by the driving device to drive the milling fishing device to rotate, so that the grinding teeth 12 mill the falling objects, liquid is injected into an annular space between the pipe column and a sleeve, fragments formed after the falling objects are milled enter a fishing barrel 10 from bottom to top along with the liquid in the annular space in the process of continuous liquid injection, the second elastic fishing claw 11 is jacked open to enter the upper part of the second elastic fishing claw 11 in the process of ascending of the fragments with relatively large volume, the fragments with relatively small volume enter a collecting barrel 4 through a conical guide barrel 8, the falling objects in the collecting barrel 4 push down the first elastic fishing claw 9, each first elastic fishing claw 9 is retracted, the falling object with relatively small volume is blocked in the collecting barrel 4, the falling object in the fishing barrel 10 can press down the second elastic fishing claw 11, each second elastic fishing claw 11 is retracted, the falling object with relatively large volume is blocked in the fishing barrel 10, then the driving equipment is closed, liquid is not injected into the annular space, and the milling fishing device is lifted out of the wellhead to complete the milling fishing work.

Embodiment 2 of the milling and fishing device provided in the present invention:

the present embodiment is different from embodiment 1 in that: in embodiment 1, the grinding teeth 12 are welded to the bottom of the outer cylinder 1. In other embodiments, the bottom edge of the outer cylinder 1 is provided with an annular inward-turned edge, the inward-turned edge is provided with a connecting hole, the grinding teeth 12 are provided with mounting holes, the grinding teeth 12 are mounted on the inward-turned edge by penetrating bolts into the connecting hole and the mounting holes, and in addition, when the connecting mode is adopted, the grinding teeth 12 can also be triangular diamond blocks. In other embodiments, the grinding teeth 12 may be directly punched on the lower end edge of the outer cylinder 1.

Embodiment 3 of the milling and fishing device provided in the present invention:

the present embodiment is different from embodiment 1 in that: in embodiment 1, two layers of the second elastic fishing claws 11 are arranged in the fishing barrel 10. In this embodiment, the overshot 10 is provided with more than two layers of second elastic overshooting claws 11, and the second elastic overshooting claws 11 on each layer are arranged at intervals in the up-down direction. In other embodiments, a layer of second elastic fishing claws 11 can be arranged in the fishing barrel 10.

Embodiment 4 of the milling and fishing device provided in the present invention:

the present embodiment is different from embodiment 1 in that: in embodiment 1, the first resilient overshooting claw 9 is welded to the upper end edge of the tapered guiding cylinder 8. In this embodiment, the upper end of the tapered guide cylinder 8 is provided with a turning edge, the turning edge is provided with a connecting hole, the lower end of the first elastic salvaging claw 9 is provided with a folding edge, and the folding edge is provided with a mounting hole so as to connect the first elastic salvaging claw 9 to the turning edge through a bolt. In other embodiments, the first resilient overshooting jaw 9 can be cut directly on the upper end edge of the conical guiding drum 8.

Embodiment 5 of the milling and fishing device provided in the present invention:

the present embodiment is different from embodiment 1 in that: in embodiment 1, a first elastic catch 9 is attached to the upper end edge of the conical guide sleeve 8. In this embodiment, a plurality of elastic tilting plates may be punched inward on the wall of the tapered guide cylinder 8, and each elastic tilting plate forms the first elastic catch 9.

Embodiment 6 of the milling and fishing device provided in the present invention:

the present embodiment is different from embodiment 1 in that: in example 1, the tapered guide cylinder 8 was welded to the inner wall of the capturing cylinder 5. In this embodiment, a through hole is formed in the wall of the capturing cylinder 5, a connection hole is formed in the wall of the tapered guiding cylinder 8, and the tapered guiding cylinder 8 is connected to the capturing cylinder 5 by inserting a bolt into the through hole and the connection hole.

Example 7 of the milling fishing device provided in the present invention:

the present embodiment is different from embodiment 1 in that: in embodiment 1, the second elastic overshot 11 is welded to the inner wall of the overshot 10. In this embodiment, the lower end of each second elastic fishing claw 11 is provided with a folded edge, the folded edge extends in the vertical direction, the folded edge is provided with a connecting hole, and the wall of the fishing barrel 10 is provided with a through hole, so that the second elastic fishing claw 11 is connected to the fishing barrel 10 by inserting a bolt through the folded edge and the wall of the fishing barrel 10.

Embodiment 8 of the milling fishing device provided in the present invention:

the present embodiment is different from embodiment 1 in that: in embodiment 1, the outer cylinder 1 is composed of three sections of a collecting cylinder 4, a capturing cylinder 5 and an overshot 10. In the present embodiment, the outer cylinder 1 may be an integral structure.

The above description is only a preferred embodiment of the present invention, and not intended to limit the present invention, the scope of the present invention is defined by the appended claims, and all changes in the structure equivalent to the content of the description and the drawings of the present invention should be considered as being included in the scope of the present invention.

Claims

1. A grinding and milling fishing device comprises an outer barrel (1), wherein an upper joint (2) is arranged at the upper end of the outer barrel (1), the upper joint (2) is used for being connected with a pipe column, and grinding teeth (12) are arranged at the lower end of the outer barrel (1) and used for grinding and milling underground falling objects when the outer barrel (1) rotates; an elastic fishing claw is arranged in the outer cylinder (1), extends from the inner wall of the outer cylinder (1) to the central axis in an upward inclined manner, and is used for allowing fallen objects to enter and supporting and fishing the fallen objects; the elastic fishing claw is characterized by comprising a first elastic fishing claw (9) and a second elastic fishing claw (11) which are sequentially arranged along the vertical direction, wherein the first elastic fishing claw (9) and the second elastic fishing claw (11) are arranged in a plurality along the circumferential direction of the outer barrel (1), the circumferential interval between the first elastic fishing claws (9) is smaller than the circumferential interval between the second elastic fishing claws (11), and the orifices which are formed by the first elastic fishing claws (9) and used for the falling objects to pass through are smaller than the orifices which are formed by the second elastic fishing claws (11) and used for the falling objects to pass through.

2. The milling and fishing device according to claim 1, characterized in that a tapered guide cylinder (8) with a small top and a large bottom is arranged in the outer cylinder (1), the lower end of the tapered guide cylinder (8) is fixed on the inner wall of the outer cylinder (1), and the first elastic fishing claw (9) is arranged on the tapered guide cylinder (8).

3. Milling fishing device according to claim 2, characterised in that the first resilient overshooting claw (9) is welded on a conical guiding barrel (8).

4. Milling and fishing device according to claim 3, characterised in that the first resilient fishing claw (9) is connected to the upper end face of the conical guiding barrel (8).

5. Milling and fishing device according to claim 2, 3 or 4, characterised in that the outer barrel (1) comprises a collecting barrel (4) and a catching barrel (5) which are connected in turn from top to bottom in a threaded manner, the upper joint (2) is arranged on the collecting barrel (4), and the lower end of the conical guide barrel (8) is connected to the catching barrel (5).

6. A milling fishing device according to claim 5, characterized in that the lower end of the conical guiding barrel (8) is welded on the inner wall of the catching barrel (5).

7. The milling fishing device according to claim 5, wherein the outer barrel (1) further comprises a fishing barrel (10), the fishing barrel (10) is in threaded connection with the lower part of the capturing barrel (5), the upper end and the lower end of the capturing barrel (5) are both provided with external threads, the lower end of the collecting barrel (4) and the upper end of the fishing barrel (10) are both provided with internal threads, the two ends of the capturing barrel (5) are connected with the collecting barrel (4) and the fishing barrel (10), and the outer wall surfaces of the collecting barrel (4), the capturing barrel (5) and the fishing barrel (10) are flush.

8. The milling fishing device according to any of claims 1 to 4, characterized in that the second elastic fishing claw (11) is arranged in at least two layers at intervals in the vertical direction.

9. The milling and fishing device according to claim 8, characterized in that the outer cylinder (1) is a cylinder body with a closed circumference, and the first elastic fishing claw (9) and the second elastic fishing claw (11) are both directly or indirectly fixed on the wall of the outer cylinder (1) in a split manner.

10. Milling fishing device according to one of claims 1 to 4, characterized in that the grinding teeth (12) are alloy blocks welded at the bottom of the outer barrel (1).