Multifunctional fishing tool

Abstract

The utility model provides a multifunctional fishing tool, and belongs to the technical field of underground fishing tools. The multifunctional fishing tool comprises a fishing cylinder, the upper end of the fishing cylinder is provided with a connecting structure used for being connected with the coiled tubing, a center rod is arranged in the fishing cylinder, the upper end of the center rod is fixedly connected with the inner wall of the fishing cylinder, and a fishing claw is arranged outside the center rod. A moving space allowing a fishing neck of a fished object to enter and enabling the fishing barrel to move up and down relative to the fishing neck is formed in the lower portion in the fishing barrel, and an impacting structure used for impacting the top of the fished object is arranged at the lower end of the center rod. According to the utility model, the three functions of flushing, unfreezing and fishing are integrated, the fishing cylinder can be lowered while circulating flushing is realized, the fish top can be conveniently flushed cleanly to be led into the fishing cylinder, a movable space is arranged in the fishing cylinder, the lower end of the center rod is provided with an impact structure, and when the throttler is severely blocked, the continuous oil pipe is lifted and lowered, so that the fishing cylinder can be lifted up and down. And the impact structure impacts the fish top, so that the throttler is released and fished.

Description

Technical Field

[0001] The utility model relates to a multifunctional fishing tool, belonging to the technical field of downhole fishing tools. Background Technique

[0002] The throttle is an important tool for downhole throttling. During the exploitation of oil and gas fields, due to factors such as water flooding in the formation, the productivity of oil and gas wells gradually decreases. Factors such as formation sand spitting, hydrates, oil sludge, and rust debris on the pipe wall cause the downhole throttle to be blocked, and it is necessary to fish the throttle. Currently, the conventional method for fishing the throttle is to use a wire of a well testing vehicle to connect a special fishing barrel for operation. However, due to factors such as long-term scaling of the production string, corrosion and chipping of the pipe wall, and deposition of oil sludge, the success rate of this fishing method is relatively low. Moreover, the tensile ultimate load of the wire is relatively low. Once the throttle encounters resistance during the lifting process, the wire has the risk of being broken, resulting in downhole accidents.

[0003] In this regard, the Chinese utility model patent with the authorization announcement number CN201883977U discloses a coiled tubing fishing tool for a slip type downhole throttle, including an upper joint, a central tube, an outer spring, a positioning block, a slip, and a locking sleeve. The upper end of the upper joint is provided with an internal thread for connecting the coiled tubing. The upper end of the central tube is threadedly connected to the inner wall of the upper joint. The lower end of the upper joint is provided with an annular cylinder. The upper end of the locking sleeve is in the annular space and is fixed to the upper joint through a safety shear pin. The upper end of the slip is nested on the outer wall of the locking sleeve. There is a positioning block at the upper end of the slip. The inner arc surface of the positioning block contacts the outer wall of the central tube, and the lower end of the positioning block abuts against the limiting step at the lower end of the central tube. The outer spring is sleeved outside the locking sleeve, and both ends abut between the upper end surface of the slip and the lower end surface of the upper joint. The lower end of the slip is provided with an inward protruding claw, and the number of claws is three. The claws of the slip are in the window at the lower end of the locking sleeve.

[0004] During use, connect the upper joint of the fishing tool below the coiled tubing, quickly lower the coiled tubing for downhole fishing 2 - 3 m above the downhole throttle, and combine Figure 1 As shown, the throttle includes a central tube 7, a fishing step 8, and a fishing neck 9. Under the action of inertia, when the slip abuts against the fishing step 8, it generates a radial deformation, so that the fishing neck 9 is inserted into the slip. Since the inner diameter of the slip is smaller than the outer diameter of the fishing neck 9 when the slip is in the natural state, at this time, the slip successfully grabs the necking part of the fishing neck. As the coiled tubing is lifted, the throttle is taken out of the wellbore.

[0005] However, the above-mentioned fishing tool completely utilizes the pulling force of the lifted tubing to release the throttle. By lifting the fishing neck to drive the throttle slip to move upward, a large amount of friction needs to be overcome during this process to force the seating cone surface of the throttle to displace and separate. This method has a single function and is applicable to conventional fishing. However, once the throttle is severely stuck, this method cannot achieve smooth release, bringing inconvenience to the fishing work. Summary of the Utility Model

[0006] The purpose of the present utility model is to provide a multifunctional fishing tool, so as to solve the problem that the existing fishing tools can only release the stuck object by lifting the tubing, and when the jamming is serious, the stuck object cannot be smoothly released.

[0007] To achieve the above purpose, the following technical solutions are adopted for the multifunctional fishing tool in the present utility model:

[0008] A multifunctional fishing tool includes a fishing barrel. A connection structure for connecting with a coiled tubing is arranged at the upper end of the fishing barrel. A central rod is arranged inside the fishing barrel. The upper end of the central rod is fixedly connected to the inner wall of the fishing barrel. A fishing claw is arranged outside the central rod. An avoidance window for the fishing claw to expand and deform outwards is opened on the barrel wall of the fishing barrel. An activity space for the fishing neck of the object to be fished to enter and enable the fishing barrel to move up and down relative to the fishing neck is arranged at the lower part inside the fishing barrel. An impact structure for impacting the top of the object to be fished is arranged at the lower end of the central rod.

[0009] The beneficial effects of the above technical solutions are as follows: The present utility model is an improved invention. Mainly, an activity space for the fishing neck of the object to be fished to enter and enable the fishing barrel to move up and down relative to the fishing neck is arranged at the lower part inside the fishing barrel. At the same time, an impact structure for impacting the top of the object to be fished is arranged at the lower end of the central rod. In this way, after the fishing neck of the object to be fished enters the fishing barrel and the fishing claw catches the fishing neck, by lifting and lowering the coiled tubing and cooperating with the designed activity space, the fishing barrel and the central rod can move up and down relative to the object to be fished, and then the impact structure impacts the top of the object to be fished, so that the object to be fished is loosened and directly released, or after being impacted and loosened, the object to be fished is released by lifting the coiled tubing. Compared with the existing method of only relying on lifting the tubing to release the stuck object, the present utility model has more powerful functions and can more smoothly release the stuck object, facilitating the smooth progress of the fishing work.

[0010] Further, an impact ring is fixedly connected to the outside of the lower end of the central rod. The impact ring and the lower end face of the central rod jointly form the impact structure. The upper end face of the impact ring is used for stop cooperation with the fishing claw.

[0011] The beneficial effects of the above technical solutions are as follows: It is convenient for the installation and limitation of the fishing claw, and at the same time, it ensures that the impact structure can cover a large area and can also increase the impact inertia force.

[0012] Further, the central rod has a central hole that runs through up and down for introducing a flushing fluid. A diversion hole communicated with the central hole is arranged on the rod wall of the central rod. A flushing hole corresponding to and communicated with the diversion hole is arranged on the impact ring.

[0013] The beneficial effects of the above technical solution are as follows: Designing the central hole and the flushing hole can flush the scale debris around the object to be salvaged, facilitating the entry of the object to be salvaged into the movable space and facilitating the fishing claws to catch the fishing neck.

[0014] Further, the diversion hole extends obliquely downward, and the flushing hole includes an obliquely extending section consistent with the extension direction of the diversion hole and a vertically extending section connected to the obliquely extending section.

[0015] The beneficial effects of the above technical solution are as follows: Facilitating diversion and flushing downward, improving the flushing effect.

[0016] Further, the central rod has a central hole that runs through up and down for introducing the flushing liquid, and the impact structure is provided with a flushing hole communicated with the central hole.

[0017] The beneficial effects of the above technical solution are as follows: Designing the flushing hole can flush the scale debris around the object to be salvaged, facilitating the entry of the object to be salvaged into the movable space and facilitating the fishing claws to catch the fishing neck.

[0018] Further, the impact ring is threadedly connected to the lower end of the central rod.

[0019] The beneficial effects of the above technical solution are as follows: Facilitating disassembly and assembly.

[0020] Further, at least three fishing claws are provided and each fishing claw is separately provided. Each fishing claw includes a fitting portion that cooperates with the outer wall surface of the central rod. The upper end of the fitting portion extends into the space between the central rod and the fishing cylinder. A limiting groove adapted to the outer shape of the fitting portion for the fitting portion to be snapped into is provided on the inner wall surface of the fishing cylinder and / or the outer wall surface of the central rod.

[0021] The beneficial effects of the above technical solution are as follows: Each fishing claw is separately provided, and the lower end is facilitated to open and deform outward through upper-end limitation. At the same time, setting the limiting groove can position the circumferential position of the fishing claw to prevent the fishing claw from shifting.

[0022] Further, the limiting groove is provided on the inner wall surface of the fishing cylinder. A clamping groove is provided on the inner wall of each fishing claw. The multifunctional fishing tool further includes a support ring sleeved outside the central rod. Each fishing claw is clamped outside the support ring through the clamping groove.

[0023] The beneficial effects of the above technical solution are as follows: Setting the support ring can enable each fishing claw to be installed together with the support ring, and is convenient for maintaining the positions of each fishing claw after installation, facilitating the subsequent assembly of other components.

[0024] Furthermore, a bearing ring is convexly provided at the upper end of the central rod. The bearing ring is fixedly connected to the inner wall of the fishing barrel. An annular space is formed between the part of the central rod below the bearing ring and the fishing barrel. The upper end of the fishing claw is located in the annular space. An elastic member is also provided in the annular space. The upper and lower ends of the elastic member respectively abut against the bearing ring and the fishing claw.

[0025] The beneficial effects of the above technical solution are as follows: The elastic member is provided to buffer when the fishing claw contacts the object to be fished, avoiding the breakage of the fishing claw caused by rigid contact at too high a speed.

[0026] Furthermore, a bearing ring is integrally and convexly provided at the upper end of the central rod. The bearing ring is threadedly connected to the inner wall of the fishing barrel. A loading and unloading hole for a tool to be inserted is provided on the upper end surface of the bearing ring.

[0027] The beneficial effects of the above technical solution are as follows: The bearing ring is threadedly connected, and a loading and unloading hole is provided on the upper end surface of the bearing ring, which is convenient for disassembly and assembly. BRIEF DESCRIPTION OF THE DRAWINGS

[0028] Figure 1 is a schematic structural diagram of a throttle in the prior art;

[0029] Figure 2 is a sectional view of the multifunctional fishing tool of the present invention;

[0030] Figure 3 is an external view of the multifunctional fishing tool of the present invention;

[0031] Figure 4 is a sectional view of the mating part of the fishing barrel and the fishing claw of the multifunctional fishing tool of the present invention;

[0032] Figure 5 is the front view of the fishing claw of the multifunctional fishing tool of the present invention;

[0033] Figure 6 is the left view of the fishing claw of the multifunctional fishing tool of the present invention;

[0034] Figure 7 is the right view of the fishing claw of the multifunctional fishing tool of the present invention;

[0035] Figure 8 is the structural diagram of the support ring of the multifunctional fishing tool of the present invention;

[0036] Figure 9 is the usage state diagram of the multifunctional fishing tool of the present invention (when the claw teeth just contact the fishing step);

[0037] Figure 10 is the usage state diagram of the multifunctional fishing tool of the present invention (when the fishing neck enters the movable space).

[0038] In the figure: 1. salvage tube; 1-1. internal thread; 1-2. annular space; 1-3. avoidance window; 1-4. activity space; 1-5. limit groove; 2. center rod; 2-1. load-bearing ring; 2-2. loading and unloading hole; 2-3. center hole; 2-4. diversion hole; 3. impact ring; 3-1. oblique extension section; 3-2. vertical extension section; 4. salvage claw; 4-1. claw arm; 4-2. matching part; 4-3. slot; 4-4. stop step; 4-5. inclined surface; 4-6. claw teeth; 5. support ring; 6. strong spring; 7. center tube; 8. salvage step; 9. salvage neck. DETAILED DESCRIPTION

[0039] The features and performance of the present invention are further described in detail below in conjunction with the embodiments.

[0040] Embodiment 1 of the multifunctional fishing tool of the utility model:

[0041] The multifunctional salvage tool in this embodiment is used for salvaging the throttle. The multifunctional salvage tool integrates the three functions of flushing, unblocking and salvaging. It can realize cyclic flushing and lowering the overshot tube at the same time, so as to flush the fish top and lead it into the overshot tube. In addition, a movable space is provided in the overshot tube, and an impact structure is provided at the lower end of the center rod. When the throttle is seriously stuck, the impact structure can hit the fish top by lifting and lowering the continuous oil pipe, so as to realize the unblocking and salvaging of the throttle.

[0042] Specific as Figure 2 and Figure 3 As shown, the multifunctional salvage tool comprises a salvage tube 1. The salvage tube 1 in this embodiment is an integrated salvage tube. A connecting structure for connecting to a continuous oil pipe is provided at the upper end of the salvage tube 1. The connecting structure is specifically an internal thread 1-1, which is used to connect to the continuous oil pipe variable thread external thread.

[0043] A center rod 2 is provided in the overshot tube 1, and the upper end of the center rod 2 is fixedly connected to the inner wall of the overshot tube 1. Specifically, a load ring 2-1 is integrally provided on the upper end of the center rod 2, and an annular space 1-2 is formed between the portion of the center rod 2 below the load ring 2-1 and the overshot tube 1. The load ring 2-1 is threadedly connected to the inner wall of the overshot tube 1, and the load ring 2-1 has a certain wall thickness, which can transmit the impact load of the center tube of the down-strike throttle to the continuous oil pipe. In order to facilitate the disassembly and assembly of the load ring 2-1, a loading and unloading hole 2-2 for the tool to be inserted is provided on the upper end surface of the load ring 2-1 to transmit the make-up and break-out torque.

[0044] The center rod 2 is provided with a fishing claw 4 on the outside. In this embodiment, there are three fishing claws 4 and each fishing claw 4 is separately provided. Figure 5 , Figure 6 and Figure 7As shown, each fishing claw 4 includes a claw arm 4-1, a mating portion 4-2 provided at the upper end of the claw arm 4-1, and a claw tooth 4-6 provided at the lower end of the claw arm 4-1. Combining Figure 2 As shown, the mating portion 4-2 mates with the outer wall surface of the central rod 2, and the upper end of the mating portion 4-2 extends into the space between the central rod 2 and the fishing barrel 1, that is, the upper end of the fishing claw 4 is located in the annular space 1-2. As Figure 4 As shown, a limiting groove 1-5 adapted to the outer shape of the mating portion 4-2 for the mating portion 4-2 to snap into is provided on the inner wall surface of the fishing barrel 1, thereby restricting the circumferential positions of the three fishing claws 4. At the same time, for the convenience of installation and to keep the three fishing claws 4 in the corresponding limiting grooves 1-5, the multifunctional fishing tool further includes a support ring 5 sleeved outside the central rod 2. A clamping groove 4-3 is provided on the inner wall of the mating portion 4-2 of each fishing claw 4, and each fishing claw 4 is clamped outside the support ring 5 through the clamping groove 4-3. As Figure 8 As shown, the support ring 5 is a non-closed circular ring, so it can be appropriately deformed during the installation process and can be reset after being installed in place, which is convenient for assembly.

[0045] As Figure 3 As shown, avoidance windows 1-3 are provided at positions corresponding to the respective fishing claws 4 on the barrel wall of the fishing barrel 1. Under normal conditions, the claw arms 4-1 of the fishing claws 4 are located within the avoidance windows 1-3 and do not protrude from the outer surface of the fishing barrel 1. When the claw teeth 4-6 are deformed by force, the avoidance windows 1-3 can allow the claw arms 4-1 of the fishing claws 4 to expand and deform outward. In addition, as Figures 5 to 7 As shown, a stop step 4-4 is provided between the inner side of the mating portion 4-2 and the inner side of the claw arm 4-1, and an inclined surface 4-5 is provided on the outer surface of the mating portion 4-2.

[0046] In the present utility model, as Figure 2 and Figure 10 As shown, an activity space 1-4 for the fishing neck 9 of the throttle valve to enter and for the fishing barrel 1 to move up and down relative to the fishing neck 9 is provided in the lower part of the fishing barrel 1, that is, the vertical height of the activity space 1-4 is greater than the distance from the upper end surface of the central tube 7 of the throttle valve to the fishing step 8. Among them, the fishing neck 9 is the part used to be grabbed and unjammed during the operation of fishing the throttle valve by conventional (wire operation and other methods), that is, the part to be grabbed during fishing.

[0047] An impact structure for hitting the top of the central tube 7 is provided at the lower end of the central rod 2. In this embodiment, an impact ring 3 is threadedly connected to the outside of the lower end of the central rod 2. The impact ring 3 has a certain wall thickness, and the upper end surface of the impact ring 3 and the lower end surface of the central rod 2 together form the above-mentioned impact structure. Moreover, the upper end surface of the impact ring 3 is used for stop cooperation with the stop step 4-4 of the fishing claw 4 to limit the extreme position of the fishing claw 4 moving downward.

[0048] As Figure 2As shown in the figure, an elastic member is also provided in the annular space 1-2. In this embodiment, the elastic member is a powerful spring 6. The upper and lower ends of the powerful spring 6 respectively abut against the bearing ring 2-1 and the fishing claw 4. Combining Figure 9 As shown in the figure, when the claw teeth 4-6 of the fishing claw 4 come into contact with the fishing step 8 of the restrictor, in addition to the claw arm 4-1 being able to expand and deform outward, the entire fishing claw 4 can also move upward, further compressing the powerful spring 6. When the claw teeth 4-6 cross over the fishing step 8 and get stuck outside the fishing neck 9, the powerful spring 6 can push the fishing claw 4 to reset downward, that is, the powerful spring 6 can buffer the impact when the fishing claw 4 contacts the fishing step 8 of the restrictor.

[0049] As Figure 2 shown in the figure, the central rod 2 has a central hole 2-3 that runs through from top to bottom for introducing flushing fluid, providing a circulation and flushing channel for the operation of fishing the restrictor. A diversion hole 2-4 communicating with the central hole 2-3 is provided on the rod wall of the central rod 2, and the diversion hole 2-4 extends obliquely downward. Flushing holes corresponding to and communicating with the diversion hole 2-4 are provided on the impact ring 3. The flushing holes include an obliquely extending section 3-1 that is consistent with the extending direction of the diversion hole 2-4 and a vertically extending section 3-2 connected to the obliquely extending section 3-1. By providing the central hole 2-3, the diversion hole 2-4 and the flushing holes, continuous flushing of the fish head can be achieved when impacting the restrictor, and then the scale debris around the fish head and the slips can be flushed at close range, providing favorable conditions for releasing the stuck. At the same time, the central tube 7 of the restrictor transmits the downward impact load and has built-in water eyes.

[0050] The working principle of the multifunctional fishing tool in the present utility model is as follows:

[0051] Method 1 for releasing the stuck and fishing the restrictor: As Figure 9 and Figure 10 shown in the figure, while circulating and flushing, lower the fishing barrel 1. After the fish head is flushed clean, lead the fish into the fishing barrel 1. The claw teeth 4-6 of the fishing claw 4 pass through the fishing step 8 in advance and descend to the fishing neck 9 (ensuring that the fallen fish is caught first). Then lift and lower the coiled tubing, and transmit the load downward through the fishing barrel 1, the central rod 2, and the impact ring 3. The impact ring 3 impacts the central tube 7 of the restrictor, and the restrictor descends. The seating cone surface of the slips of the restrictor loses support, achieving release of the stuck. At this time, the restrictor drops, and the claw teeth 4-6 that have passed through the fishing step 8 in advance and are placed outside the fishing neck 9 capture the restrictor, achieving release of the stuck and fishing.

[0052] Method 2 for releasing the stuck and fishing the restrictor: While circulating and flushing, lower the fishing barrel 1. After the fish head is flushed clean, lead the fish into the fishing barrel. After the claw teeth 4-6 of the fishing claw 4 pass through the fishing step 8 to the position of the fishing neck 9, lift the tubing. The fishing neck 9 drives the slips of the restrictor to move upward, and the frictional resistance between the large-diameter lower part of the restrictor and the tubing forces the seating cone surface to displace and separate, achieving fishing and release of the stuck.

[0053] The third stuck-pipe release and fishing method of the restrictor can carry out Method 1 or Method 2 under the condition of stopping the pump, or alternately repeat Method 1 and Method 2 multiple times to achieve stuck-pipe release and fishing by movement.

[0054] In summary, the multi-functional fishing tool of the present utility model can be directly connected to the coiled tubing, with quick installation and simple operation, and is consistent with the conventional coiled tubing fishing operation process. Compared with the wire operation method, the advantages of coiled tubing fishing are brought into play, and multi-process restrictor fishing can be carried out synchronously or sequentially, with a success rate of more than 3 times that of the conventional fishing basket, which is a powerful tool for reducing consumption and increasing efficiency, speeding up and improving efficiency, and the high-quality development of oil and gas fields. And for the second stuck-pipe release and fishing method of the restrictor, the coiled tubing can also meet and be better than the conventional fishing under this condition.

[0055] Embodiment 2 of the multi-functional fishing tool in the present utility model: This embodiment provides different connection methods for the central rod and the fishing basket. Different from Embodiment 1, the bearing ring at the upper end of the central rod is fixedly welded to the inner wall of the fishing basket. In other embodiments, the inner wall of the fishing basket can also be set as a stepped hole, and the bearing ring is no longer protruded at the upper end of the central rod, and the outer wall of the central rod is directly threadedly connected to the inner wall of the fishing basket.

[0056] Embodiment 3 of the multi-functional fishing tool in the present utility model: This embodiment provides different setting methods for the elastic member. Different from Embodiment 1, a stop step is provided on the fishing basket, and the upper and lower ends of the elastic member respectively abut against the stop step and the fishing claws. Of course, in other embodiments, the elastic member can also not be provided. At this time, when the fishing claws contact the object to be fished, the fishing claws only expand outward and no longer move upward.

[0057] Embodiment 4 of the multi-functional fishing tool in the present utility model: This embodiment provides different installation methods for the split fishing claws. Different from Embodiment 1, the support ring is no longer provided, and the inner walls of the fishing claws directly cooperate with the outer wall surface of the central rod.

[0058] Embodiment 5 of the multi-functional fishing tool in the present utility model: This embodiment provides different installation methods for the split fishing claws. Different from Embodiment 1, the support ring is no longer provided, and limit grooves adapted to the shape of the matching part for the matching part to be stuck in are provided on both the outer wall surface of the central rod and the inner wall surface of the fishing basket. Of course, in other embodiments, the limit groove can also be provided only on the outer wall surface of the central rod.

[0059] Embodiment 6 of the multi-functional fishing tool in the present utility model: This embodiment provides different structural forms of the fishing claws. Different from Embodiment 1, the upper ends of the fishing claws are integrally connected by a connecting ring. The same as the prior art, at this time, there is no need to provide a limit groove on the inner wall surface of the fishing basket and / or the outer wall surface of the central rod.

[0060] Embodiment 7 of the multifunctional fishing tool in the present utility model: This embodiment provides different connection methods for the impact ring. Different from Embodiment 1, the impact ring is fixedly welded to the lower end of the central rod. In other embodiments, the impact ring can also be integrally connected to the central rod and formed by integral processing.

[0061] Embodiment 8 of the multifunctional fishing tool in the present utility model: This embodiment provides different arrangement forms for the flushing hole and the diversion hole. Different from Embodiment 1, the diversion hole extends radially, and the flushing hole is in an L shape, including a radial extension section consistent with the extension direction of the diversion hole and a vertical extension section connected to the radial extension section.

[0062] Embodiment 9 of the multifunctional fishing tool in the present utility model: This embodiment provides different structures of the central rod and different setting methods of the flushing hole. Different from Embodiment 1, an impact ring is not additionally provided at the lower end of the central rod, and the lower end of the central rod directly forms an impact structure. At this time, in addition to the central hole that penetrates the central rod up and down, a flushing hole communicating with the central hole is also provided in the rod wall of the central rod, and the flushing hole extends obliquely.

[0063] Embodiment 10 of the multifunctional fishing tool in the present utility model: This embodiment provides different structures of the central rod and the impact ring. Different from Embodiment 1, the central rod is a solid rod and no longer has a central hole and a diversion hole. At this time, no flushing hole is provided on the impact ring either, and the entire multifunctional fishing tool no longer has a flushing function, but still has an impact unclogging function.

[0064] Embodiment 11 of the multifunctional fishing tool in the present utility model: This embodiment provides different structures of the central rod and different settings of the impact structure. Different from Embodiment 1, an impact ring is not additionally provided at the lower end of the central rod, and the lower end of the central rod directly forms an impact structure. To increase the impact surface, a convex ring can be integrally protruded on the outside of the lower end of the central rod, and the lower end surface of the convex ring is used for impact, and the upper end surface of the convex ring can be in a blocking fit with the fishing claw. Of course, in other embodiments, the lower end of the central rod can be of equal diameter and no convex ring is provided. At this time, the upper end of the fishing claw can be fixed on the central rod or the fishing cylinder and no longer needs to be in a blocking fit with other structures.

[0065] Embodiment 12 of the multifunctional fishing tool in the present utility model: This embodiment provides other forms of the connection structure at the upper end of the fishing cylinder. Different from Embodiment 1, the connection structure is an external thread.

[0066] The above are only the preferred embodiments of the present utility model and are not intended to limit the present utility model. The patent protection scope of the present utility model is subject to the claims. All equivalent structural changes made by using the description and drawings of the present utility model should be included in the protection scope of the present utility model by the same token.

Claims

1. A multifunctional fishing tool, comprising a fishing barrel (1). A connecting structure for connecting with a coiled tubing is arranged at the upper end of the fishing barrel (1). A central rod (2) is arranged inside the fishing barrel (1). The upper end of the central rod (2) is fixedly connected to the inner wall of the fishing barrel (1). A fishing claw (4) is arranged outside the central rod (2). An avoidance window (1-3) for the outward expansion and deformation of the fishing claw (4) is provided on the barrel wall of the fishing barrel (1). It is characterized in that: An activity space (1-4) is provided at the lower part inside the fishing barrel (1) for the fishing neck (9) of the object to be fished to enter and enabling the fishing barrel (1) to move up and down relative to the fishing neck (9). An impact structure for hitting the top of the object to be fished is provided at the lower end of the central rod (2).

2. The multifunctional fishing tool according to claim 1, characterized in that: An impact ring (3) is fixedly connected to the outside of the lower end of the central rod (2). The impact ring (3) and the lower end face of the central rod (2) together form the said impact structure. The upper end face of the impact ring (3) is used for stop cooperation with the fishing claws (4).

3. The multifunctional fishing tool according to claim 2, characterized in that: The central rod (2) has a central hole (2-3) that runs through up and down for flushing liquid to pass through. Diversion holes (2-4) communicating with the central hole (2-3) are provided on the rod wall of the central rod (2). Flushing holes corresponding to and communicating with the diversion holes (2-4) are provided on the impact ring (3).

4. The multi-functional fishing tool according to claim 3, wherein: The diversion holes (2-4) extend obliquely downward. The flushing holes include an obliquely extending section (3-1) consistent with the extending direction of the diversion holes (2-4) and a vertically extending section (3-2) connected to the obliquely extending section (3-1).

5. The multifunctional fishing tool according to claim 1, characterized in that: The central rod (2) has a central hole (2-3) that runs through up and down for flushing liquid to pass through. Flushing holes communicating with the central hole (2-3) are provided on the impact structure.

6. The multifunctional fishing tool according to any one of claims 2 to 4, characterized in that: The impact ring (3) is threadedly connected to the lower end of the central rod (2).

7. The multi-functional fishing tool according to any one of claims 1 to 5, characterized in that: At least three fishing claws (4) are provided and each fishing claw (4) is separately arranged. Each fishing claw (4) includes a cooperating part (4-2) that cooperates with the outer wall surface of the central rod (2). The upper end of the cooperating part (4-2) extends into the space between the central rod (2) and the fishing barrel (1). Limiting grooves (1-5) adapted to the outer shape of the cooperating part (4-2) for the cooperating part (4-2) to snap into are provided on the inner wall surface of the fishing barrel (1) or / and the outer wall surface of the central rod (2).

8. The multi-functional fishing tool according to claim 7, wherein: The said limiting grooves (1-5) are provided on the inner wall surface of the said fishing barrel (1). Card slots (4-3) are provided on the inner walls of each fishing claw (4). The multi-functional fishing tool further includes a support ring (5) sleeved outside the central rod (2). Each fishing claw (4) is snapped outside the support ring (5) through the card slots (4-3).

9. The multifunctional fishing tool according to any one of claims 1 to 5, characterized in that: A bearing ring (2-1) protrudes from the upper end of the central rod (2). The bearing ring (2-1) is fixedly connected to the inner wall of the fishing barrel (1). An annular space (1-2) is formed between the part of the central rod (2) below the bearing ring (2-1) and the fishing barrel (1). The upper ends of the fishing claws (4) are located inside the annular space (1-2). An elastic member is further provided inside the annular space (1-2). The upper and lower ends of the elastic member respectively abut against the bearing ring (2-1) and the fishing claws (4).

10. The multi-functional fishing tool according to any one of claims 1 to 5, characterized in that: A bearing ring (2-1) integrally protrudes from the upper end of the central rod (2). The bearing ring (2-1) is threadedly connected to the inner wall of the fishing barrel (1). A loading and unloading hole (2-2) for a tool to be inserted is provided on the upper end face of the bearing ring (2-1).

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