CN216277768U - Corroded oil pipe underground fishing tool - Google Patents

Abstract

The utility model belongs to the technical field of underground fishing tools, and particularly relates to an underground fishing tool for a corroded oil pipe, which comprises a barrel, a making and buckling fishing part, a clamping and supporting part and a fragment containing fishing part, wherein the making and buckling fishing part, the clamping and supporting part and the fragment containing fishing part are sequentially arranged from top to bottom; the making and fishing part comprises a tapered thread fishing body which is provided with a tapered male buckle; the clamping support part comprises a slide rail arranged on the barrel body, at least two slide grooves are arranged on the slide rail at intervals along the circumferential direction, arc-shaped fishing tooth blocks are assembled in the slide grooves in a sliding mode, each arc-shaped fishing tooth block is provided with an arc-shaped tooth surface used for clamping an corroded oil pipe, and the slide grooves are obliquely arranged from top to bottom and back to the center of the barrel body; the fragment storage and fishing part comprises at least two elastic storage teeth arranged at intervals along the circumferential direction, the upper end of each elastic storage tooth obliquely extends towards the central position of the barrel, the upper end of each elastic storage tooth can swing towards the direction of the inner wall of the barrel to avoid the corroded oil pipe, and the elastic storage tooth can also swing back to stop the corroded oil pipe from falling.

Description

Corroded oil pipe underground fishing tool

Technical Field

The utility model belongs to the technical field of underground fishing tools, and particularly relates to an underground fishing tool for corroded oil pipes.

Background

In the process of oil field development, because underground formation fluid contains acid, alkali, hydrogen sulfide and other corrosive substances, underground production strings of oil extraction, gas production and water injection wells are corroded, and disasters such as production interruption, environmental pollution and the like can be caused seriously. In order to recover production, ensure safety and prevent environmental pollution, the corroded oil pipe and accessories in the well need to be fished out.

Current oil pipe fishing tool mainly has to make and detains fishing tool, slider fishing tool and drag for instrument etc. outward, makes and detains fishing tool and accomplish linking to each other with oil pipe through making the knot on oil pipe, and then salvages oil pipe, but to corroding serious oil pipe, can't make and detain, perhaps can make after making and detain that corruption oil pipe loses rigidity and toughness, easily forms the piece, can't effective large-scale salvage. The slider fishing tool tightly supports the oil pipe through the tooth blocks which obliquely slide up and down, so that the oil pipe is relatively fixed with the oil pipe, fishing is completed, however, for the oil pipe with serious corrosion, the tooth blocks can contact a corrosion layer corroding the oil pipe during fishing, the corrosion layer falls off, the slider cannot firmly grab the inner wall of the oil pipe, and the tooth blocks easily make the oil pipe lose rigidity and toughness when tightly supporting the oil pipe, so that the wall of the oil pipe is easily broken, and fishing fails. For external fishing tools such as a slip fishing barrel, a spiral fishing barrel or a basket fishing barrel, fishing teeth are easy to be filled by a corrosion layer, and the outer wall of a corroded oil pipe slips to cause fishing failure. The existing oil pipe fishing tools can not realize reliable fishing of corroded oil pipes.

SUMMERY OF THE UTILITY MODEL

The utility model aims to provide a corroded oil pipe underground fishing tool capable of reliably fishing a corroded oil pipe.

In order to realize the purpose, the technical scheme of the underground fishing tool for the corroded oil pipe provided by the utility model is as follows: an underground fishing tool for a corroded oil pipe comprises a barrel, wherein an upper joint is arranged at the upper end of the barrel and is used for being connected with a drill rod; the fishing part for making the thread, the clamping support part and the fragment receiving and fishing part are sequentially arranged on the cylinder body from top to bottom;

the buckle making and fishing part comprises a conical thread fishing body arranged at the upper end of the cylinder body, and the conical thread fishing body is provided with a conical male buckle positioned in the cylinder body so as to make a buckle on the inner wall of the corroded oil pipe for fishing;

the clamping support part comprises a slide rail arranged on the barrel body, at least two slide grooves are arranged on the slide rail at intervals along the circumferential direction, arc-shaped fishing tooth blocks are assembled in the slide grooves in a sliding mode, each arc-shaped fishing tooth block is provided with an arc-shaped tooth surface used for clamping the corroded oil pipe, the slide grooves are obliquely arranged from top to bottom and back to the center of the barrel body, and each arc-shaped fishing tooth block is used for being matched with the corroded oil pipe;

the fragment storage and fishing part comprises at least two elastic storage teeth arranged at intervals along the circumferential direction, the lower ends of the elastic storage teeth are arranged on the barrel, the upper ends of the elastic storage teeth extend towards the center of the barrel in an inclined mode, the upper ends of the elastic storage teeth can swing towards the direction of the inner wall of the barrel to avoid corrosion oil pipes, so that the corrosion oil pipes enter the upper portions of the elastic storage teeth, and the corrosion oil pipes can also swing back to stop from falling.

Has the advantages that: each arc-shaped fishing tooth block in the clamping support part can be matched with and clamp the corroded oil pipe, and compared with a mode of tensioning and fixing in the prior art, the corroded oil pipe is not easy to damage, and the rigidity and the toughness of the corroded oil pipe are kept. The clamping support component and the buckle fishing part are matched to form an up-down resultant force, so that the corroded oil pipe can be reliably fished. In the fishing process, if the corrosion degree of the corroded oil pipe is serious and buckling and clamping support cannot be carried out, elastic containing teeth in the fragment containing and fishing part are used for supporting and preventing the oil pipe from falling; if the corrosion degree of the corroded oil pipe is not serious and an outer step is formed, the oil pipe can be supported by the elastic containing teeth; if the corrosion degree of the corrosion oil pipe is not serious and no outer step exists, the fishing and clamping are matched by using the fishing buckle, and the elastic containing teeth prevent fragments falling off in the process of fishing and lifting the corrosion oil pipe from falling into the well again. According to the utility model, by arranging a plurality of different salvaging parts, salvaging can be carried out according to the actual situation of corroding the oil pipe, so that falling to the air is avoided, and the salvaging efficiency is improved.

Preferably, the tapered threaded fishing body is provided with an inner hole which is communicated up and down so as to allow liquid to pass through. After the inner hole is formed, the falling object fish top is cleaned in a reverse circulation mode before fishing is facilitated.

Preferably, the tapered threaded fishing body is integrally formed with the upper connector.

Preferably, the tooth point angle of the conical male buckle in the conical thread fishing body is 40-75 degrees. When the sharp angle of the conical male buckle is too small, the rust layer of the oil pipe is not thoroughly stripped, the inner wall of the oil pipe cannot be effectively buckled, the formed supporting force is small, and the oil pipe cannot be effectively salvaged; when the sharp angle of the taper male buckle is too large, after the corrosion layer is peeled off, the buckle type is thick, the lines formed when the corrosion oil pipe body is eaten are large, the corrosion oil pipe loses rigidity and toughness, the body is easy to form fragments, and the large section cannot be effectively salvaged. Therefore, the sharp angle of the conical male buckle is kept at the set angle, and the corroded oil pipe can be reliably fished.

Preferably, the sliding groove is a trapezoidal sliding groove with a trapezoidal section, and the arc-shaped fishing tooth block is assembled on the trapezoidal sliding groove in a guiding and anti-falling mode.

Preferably, a limiting block is arranged on the sliding rail and used for limiting the limit of the upward movement of the arc-shaped fishing tooth block. The arc-shaped fishing tooth block can be prevented from falling off upwards after the limiting block is arranged.

Preferably, the slide rail is integrally formed with the barrel.

Preferably, the bottom of the elastic receiving tooth is fixedly arranged on the inner wall of the barrel in a split mode, and the fragment receiving and fishing part comprises a screw or a pin for fixing the bottom of the elastic receiving tooth on the barrel.

Preferably, the bottom of the cylinder body is provided with milling teeth, and the milling teeth are used for milling an oil sleeve annulus outside the corrosion oil pipe.

Preferably, the cylinder comprises an upper cylinder part, a middle cylinder part and a lower cylinder part which are connected in a split manner;

the making and fishing part is arranged at the top of the upper barrel part, the clamping and supporting part is arranged at the top of the middle barrel part, and the fragment containing and fishing part is arranged at the top of the lower barrel part. The barrel part is arranged into a plurality of parts which are separated, so that the fishing parts can be conveniently installed.

Drawings

FIG. 1 is a schematic diagram of a tool for downhole fishing of corroded tubing according to the present invention;

FIG. 2 is a schematic structural view of the arcuate fishing block of FIG. 1;

FIG. 3 is a top view of the slide rail of FIG. 1;

description of reference numerals:

1. a barrel; 2. an upper joint; 3. a tapered thread fishing body; 4. a drill stem; 5. a slide rail; 51. a trapezoidal chute; 6. arc-shaped fishing tooth blocks; 61. a trapezoidal protrusion; 62. an arc tooth surface; 7. a limiting block; 8. a receiving cavity; 9. an elastic receiving tooth; 10. a pin; 11. milling teeth in a sleeving manner; 12. an upper barrel portion; 13. a middle cylinder part; 14. a lower barrel portion.

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, 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 noted that relational terms such as "first" and "second," and the like, may be used solely to distinguish one entity or action from another entity or action without necessarily requiring or implying any actual such relationship or order between such entities or actions. Also, the terms "comprises," "comprising," or any other variation thereof, 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, elements recited by the phrase "comprising an … …" do not exclude the inclusion of such elements in processes or methods.

In the description of the present invention, unless otherwise expressly specified or limited, the terms "mounted," "connected," and "connected" when they are used are to be construed broadly, e.g., as meaning a fixed connection, a removable connection, or an integral connection; can be mechanically or electrically connected; either directly or indirectly through intervening media, or may be interconnected between two elements. 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, it should be noted that, unless explicitly stated or limited otherwise, the term "provided" may be used in a broad sense, for example, the object of "provided" may be a part of the body, or may be arranged separately from the body and connected to the body, and the connection may be a detachable connection or a non-detachable connection. 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.

The utility model provides a concrete embodiment of a corroded tubing downhole fishing tool, which comprises the following components in parts by weight:

as shown in fig. 1 to 3, the underground fishing tool for corroded oil pipes is used for fishing the underground corroded oil pipes, and a proper fishing part is automatically selected according to the corrosion degree of the corroded oil pipes so as to adapt to different underground conditions and ensure that the underground corroded oil pipes can be fished. The underground fishing tool for the corroded oil pipe is a comprehensive tool for composite fishing and storing and fishing fragments of the corroded oil pipe.

The underground fishing tool for the corroded oil pipe mainly comprises four parts, namely fishing of a catch, clamping support, storage and fishing of fragments and guiding of sleeve milling. The underground fishing tool for the corroded oil pipe comprises a barrel body 1, wherein the barrel body 1 is vertically communicated, an upper joint 2 is assembled at the upper end of the barrel body 1 through threads, and the upper joint 2 is connected with a drill rod 4 when in use to form a fishing pipe column for transmitting torque and bit pressure.

The fishing part of making a knot mainly accomplishes clearance oil pipe upper end inner wall corrosion coating to making a knot salvages, and making a knot fishing part includes that the toper screw thread salvages body 3, and the toper screw thread salvages the structure of body 3 and 2 formula as an organic whole of top connection, has the hole in the toper screw thread salvages body 3, provides well workover liquid circulation and washes the passageway that corrodes oil pipe fish top. Wherein, the taper thread fishing body 3 has the taper pin that is located barrel 1, and the taper thread fishing body 3 has certain length and tapering, and preferably, the tooth point angle of taper pin in the taper thread fishing body 3 is 40-75, and the pitch is 5-7mm, and concrete numerical value carries out reasonable selection according to the steel grade difference and the anticipated degree of corrosion. When the device is used, the tapered thread fishing body 3 is put into a well along with the drill rod 4, firstly cleans a corrosive substance layer on the inner wall of the top of the corroded oil pipe in the well under the action of low drilling pressure and low torque transmitted by the drill rod 4, and then slowly finishes buckling on the inner wall.

The clamping support part is positioned below the making and fishing part, the circumferential pre-tightening support is formed on the corroded oil pipe by mainly depending on the arc fishing tooth block 6 which is sewn on the periphery, resultant force is formed with the making and fishing part on the upper part, so that the corroded oil pipe which loses rigidity and toughness is not easy to fall off, and fishing is finished. The clamping and supporting part comprises a sliding rail 5 fixed on the inner wall of the barrel body 1, wherein the sliding rail 5 is of an annular structure, and the sliding rail 5 and the barrel body 1 are of an integral structure. As shown in fig. 3, the slide rail 5 is provided with three trapezoidal sliding grooves 51, and the three trapezoidal sliding grooves 51 are circumferentially and uniformly distributed. The notch of the trapezoidal sliding groove 51 is small, so that the arc fishing toothed block 6 arranged on the trapezoidal sliding groove 51 can be prevented from being separated. Trapezoidal spout 51 wherein inclines to arrange, and the incline direction is for from top to bottom and deviating from the central point of barrel 1 and putting, sets up trapezoidal spout 51 after, the tooth piece 6 is salvaged to the arc slides downwards more, and the drift diameter of salvaging that each arc was salvaged the formation of tooth soon 6 just is littleer, can block annotate corruption oil pipe to it presss from both sides tightly to realize corroding oil pipe.

The top corresponding to each trapezoidal spout 51 on slide rail 5 all has stopper 7, and stopper 7 prevents that arc fishing tooth piece 6 from upwards deviating from trapezoidal spout 51, and of course, in other embodiments, each stopper can be the structure of formula as an organic whole to form annular stopper. The structure of the arc-shaped fishing tooth block 6 is as shown in fig. 2, the outer side of the arc-shaped fishing tooth block 6 is a trapezoidal protrusion 61, which is matched with the trapezoidal sliding groove 51 and can slide along the trapezoidal sliding groove 51. The inner side of the arc fishing tooth block 6 is an arc tooth surface 62, and a tooth tip is arranged on the arc tooth surface 62 and can clamp a corrosion oil pipe.

In this embodiment, press from both sides tight support portion and adopt three arc to salvage the mode that tooth piece 6 cooperations pressed from both sides tight corruption oil pipe and fix corruption oil pipe, compare prior art, compare through the outside mode that props tight oil pipe of tooth piece, corrode oil pipe and be difficult by pressing from both sides the bits to can guarantee the centre gripping to corroding oil pipe. When the fishing tool is used, the clamping support part is clamped at the lower part, the conical thread fishing body 3 is fixed at the upper part in a buckling mode to form a composite fishing mode of locking the inner wall thread buckle and the outer wall arc tooth surface 62, so that an upper resultant force and a lower resultant force are formed, and the corrosion of an oil pipe is prevented from falling off.

The fragment is accomodate salvage the part and is mainly accomplished accomodating and salvage the function of corruption oil pipe fragment, accomodate tooth 9 including elasticity, elasticity is accomodate tooth 9 and is had along the circumference equipartition for three, and elasticity is accomodate tooth 9 and is the steel sheet that has certain elasticity and length, and the bottom of elasticity accomodate tooth 9 is fixed on the inner wall of barrel 1, and concrete fixed mode is for fixing through pin 10, and the top of elasticity accomodate tooth 9 extends to the inner wall of barrel 1 dorsad. Wherein, the part of the cylinder 1 above the elastic containing teeth 9 forms a containing cavity 8 for containing the debris which is introduced into the cylinder 1 and corrodes the oil pipe. When corroding oil pipe and passing each elasticity from bottom to top and accomodating tooth 9, the top of elasticity accomodating tooth 9 swings towards the inner wall of barrel 1, when corroding oil pipe and dropping downwards, elasticity is accomodate tooth 9 and can be withstood and corrode oil pipe, prevents that it from dropping to in the well, improves the salvage effect, reduces the instrument number of times of going into the well, reduces the salvage cost.

The sleeve milling introducing part is mainly used for cleaning the annular space of the external oil sleeve of the corrosion oil pipe and introducing the corrosion oil pipe and fragments into the barrel body 1, the sleeve milling introducing part comprises sleeve milling teeth 11, the sleeve milling teeth 11 are made of wear-resistant alloy materials and are welded at the bottom of the barrel body 1, sleeve milling of the annular space of the external oil sleeve of the corrosion oil pipe is completed under the action of drilling pressure and torque, and the corrosion oil pipe and the fragments are introduced into the barrel body 1 to be salvaged.

As shown in FIG. 1, for the convenience of installation, the barrel 1 is a split structure, and comprises an upper barrel part 12, a middle barrel part 13 and a lower barrel part 14, which are connected together by screw threads. Wherein the stabbing fishing part is mounted on the upper barrel part 12, the clamping support part is mounted on the top of the middle barrel part 13, the fragment receiving fishing part is mounted on the top of the lower barrel part 14, and the milling introduction part is located at the bottom of the lower barrel part 14.

During the use, drilling rod 4 links to each other with top connection 2, constitute salvage tubular column with drilling rod 4, go into the position above the top of a fish in the well along with drilling rod 4 according to operation technical standard, it is rotatory to drive salvage tubular column through ground workover rig carousel or top drive equipment drive, it is rotatory to drive this instrument, the cover mills tooth 11 of this instrument bottom under the combined action of moment of torsion and weight under, the outside oil jacket annular space of corruption oil pipe is cleared up, the workover fluid advances from the oil jacket annular space under the pressure effect that the power pump on ground provided simultaneously, go out from downhole tool and drilling rod, the workover fluid carries the piece that oil pipe corrodes from the oil jacket annular space and gets into in the barrel 1, under the effect of weight under boring, will corrode in the oil pipe introduction barrel 1. During the use, according to corroding the different conditions automatic selection of oil pipe and corresponding salvage the mode, to corroding not serious and have the corruption oil pipe of step, after corroding oil pipe entering barrel 1, the step crosses elasticity and accomodates tooth 9 after, lifts the tubular column, and elasticity is accomodate tooth 9 and is supported the step to will corrode oil pipe and upwards fish out. To the not serious corruption oil pipe that does not have the step, corrode after oil pipe gets into barrel 1, push away elasticity and accomodate tooth 9, continue to go upward, upwards promote arc salvage dog 6 and stop until stopper 7 department, the corruption oil pipe of salvaging continues to go upward, reach toper screw salvage body 3 department, under the effect of weight and moment of torsion, the salvage screw thread of toper screw salvage body 3, detain corruption oil pipe inner wall, after accomplishing the detaining, lift the salvage tubular column, if corrode oil pipe can bear the power of going upward together, then go upward along with barrel 1, arc salvage dog 6 forms the clamp force to corroding oil pipe under the dead weight effect, prevent to drop. In the in-process of going upward, the fragment that drops etc. promote elasticity and accomodate tooth 9 and fall back down, block that the fragment drops to in the well again, improve the salvage effect. If the corroded oil pipe is seriously corroded and cannot be buckled, clamped and lifted, the oil pipe is stored and fished by the elastic storage teeth 9.

The underground fishing tool for the corroded oil pipe can be suitable for corroded oil pipes with different corrosion degrees and different shapes, ensures that the corroded oil pipes cannot fall empty during fishing, and improves the fishing effect.

In this embodiment, the barrel includes the triplex, and the corresponding triplex salvage structure sets up correspondingly. In other embodiments, the cylinder body can be of an integrated structure, or the two parts are integrally formed and then connected with another split body.

In this embodiment, the bottom of the cylinder body is provided with milling teeth, and in other embodiments, the milling teeth are eliminated.

In this embodiment, accomodate the tooth and pass through the pin to be fixed on the inner wall of barrel, in other embodiments, accomodate the tooth and pass through the fix with screw on the inner wall of barrel. Alternatively, in other embodiments, a window is punched in the barrel, and the part punched into the window is inward to form the receiving teeth, and at this time, the bottom of the receiving teeth and the barrel are in an integrally molded relationship. In other embodiments, the number of the storage teeth can be increased or decreased according to actual conditions, and is at least two.

In this embodiment, the slide rail and the barrel are integrally formed, and in other embodiments, the slide rail and the barrel are fixed in a split manner, specifically, they may be welded. Set up the stopper in addition on the slide rail and come to restrict the upward movement limit of arc fishing dog, in other embodiments, the slide rail does not upwards open thoroughly, relies on the cell wall of spout to realize the restriction.

In this embodiment, the spout is trapezoidal spout, and in other embodiments, the spout can be the constant width spout, salvages the tooth piece and deviate from to set up the limiting plate in addition for preventing the arc.

In this embodiment, the taper angle of the taper pin of the taper screw fishing body is 40 to 75 °, and in other embodiments, the taper angle of the taper pin of the taper screw fishing body is increased or decreased according to actual conditions.

In the embodiment, the tapered thread fishing body and the upper joint are integrally formed, and in other embodiments, the tapered thread fishing body and the upper joint are respectively and independently connected with the barrel body and are not connected with each other.

Finally, although the present invention has been described in detail with reference to the foregoing embodiments, it will be apparent to those skilled in the art that modifications may be made to the embodiments described in the foregoing embodiments without departing from the inventive concept, or some of the technical features may be replaced with equivalents. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.

Claims (10)

1. The utility model provides a corruption oil pipe fishing tool in pit which characterized in that: the drill rod drilling machine comprises a cylinder body (1), wherein an upper connector (2) is arranged at the upper end of the cylinder body (1), and the upper connector (2) is used for being connected with a drill rod (4); the fishing part is accomodate to making knot salvage part, pressing from both sides tight support segment and piece from top to bottom having arranged in proper order on barrel (1):

the buckle making and fishing part comprises a tapered thread fishing body (3) arranged at the upper end of the cylinder body (1), and the tapered thread fishing body (3) is provided with a tapered male buckle positioned in the cylinder body (1) so as to make and fish the buckle on the inner wall of the corroded oil pipe;

the clamping support part comprises a sliding rail (5) arranged on the barrel body (1), at least two sliding grooves are arranged on the sliding rail (5) at intervals along the circumferential direction, arc-shaped fishing tooth blocks (6) are assembled in each sliding groove in a sliding mode, each arc-shaped fishing tooth block (6) is provided with an arc-shaped tooth surface (62) used for clamping a corroded oil pipe, the sliding grooves are obliquely arranged from top to bottom and back to the center of the barrel body (1), and each arc-shaped fishing tooth block (6) is used for being matched with and clamping the corroded oil pipe;

the fragment storage and fishing part comprises at least two elastic storage teeth (9) which are arranged at intervals along the circumferential direction, the lower ends of the elastic storage teeth (9) are arranged on the barrel body (1), the upper ends of the elastic storage teeth extend towards the center of the barrel body (1) in an inclined mode, the upper ends of the elastic storage teeth (9) can swing towards the direction of the inner wall of the barrel body (1) to avoid corrosion oil pipes, so that the corrosion oil pipes enter the upper portions of the elastic storage teeth (9), and the corrosion oil pipes can be prevented from falling off through elastic swinging.

2. A corroded tubing downhole fishing tool as defined in claim 1, wherein: the conical thread fishing body (3) is provided with an inner hole which is through up and down for liquid to pass through.

3. A corroded tubing downhole fishing tool as defined in claim 1, wherein: the conical thread fishing body (3) and the upper joint (2) are integrally formed.

4. A corroded tubing downhole fishing tool as claimed in claim 1 or 2 or 3, wherein: the tooth point angle of the conical male buckle in the conical thread fishing body (3) is 40-75 degrees.

5. A corroded tubing downhole fishing tool as claimed in claim 1 or 2 or 3, wherein: the sliding groove is a trapezoidal sliding groove (51) with a trapezoidal section, and the arc fishing tooth block (6) is assembled on the trapezoidal sliding groove (51) in a guiding and anti-falling mode.

6. A corroded tubing downhole fishing tool as claimed in claim 1 or 2 or 3, wherein: and a limiting block (7) is arranged on the sliding rail (5), and the limiting block (7) is used for limiting the limit of the upward movement of the arc-shaped fishing tooth block (6).

7. A corroded tubing downhole fishing tool as claimed in claim 1 or 2 or 3, wherein: the sliding rail (5) and the barrel body (1) are integrally formed.

8. A corroded tubing downhole fishing tool as claimed in claim 1 or 2 or 3, wherein: the bottom of the elastic storage tooth (9) is fixedly arranged on the inner wall of the barrel body (1) in a split mode, and the fragment storage and fishing part comprises a screw or a pin (10) which is used for fixing the bottom of the elastic storage tooth (9) on the barrel body (1).

9. A corroded tubing downhole fishing tool as claimed in claim 1 or 2 or 3, wherein: the bottom of the barrel body (1) is provided with sleeve milling teeth (11), and the sleeve milling teeth (11) are used for sleeve milling an oil sleeve annulus outside the corrosion oil pipe.

10. A corroded tubing downhole fishing tool as claimed in claim 1 or 2 or 3, wherein: the cylinder body (1) comprises an upper cylinder body part (12), a middle cylinder body part (13) and a lower cylinder body part (14) which are connected in a split manner;

the making and buckling fishing part is arranged at the top of the upper barrel part (12), the clamping and supporting part is arranged at the top of the middle barrel part (13), and the fragment containing and fishing part is arranged at the top of the lower barrel part (14).

Images