Fishing spear

Abstract

The utility model provides a fishing spear which comprises a mandrel, an upper connector connected to the two ends of the mandrel, a guide shoe, a slip matched with sawtooth-shaped threads on the mandrel and a release ring located at the end, facing the slip, of the guide shoe, and further comprises a clamping mechanism which comprises a driving frame and a clamping assembly. The driving frame comprises a frame body located in an inner hole in the end of the mandrel, a connecting rod arranged in the radial direction relative to the mandrel and connected with the frame body, a driving block connected with the end of the connecting rod and a transmission block fixed to the bottom end of the frame body, and the driving block is located at the tail end, matched with the mandrel, of the slip. The outer circumferential wall of the core shaft is provided with a sliding groove used for the driving block to move in a reciprocating mode relative to the axial direction of the core shaft, the outer circumferential wall of the core shaft is provided with a supporting block corresponding to the driving block, and a first reset spring is arranged between the driving block and the supporting block. The clamping assembly comprises a fixed block, a movable block and an abutting block which are fixed to the bottom end of the mandrel. The clamping device is stable in clamping and good in anti-falling performance.

Description

Technical Field

[0001] The utility model relates to the technical field of downhole tools for oil exploitation, and particularly relates to a fishing spear. Background Art

[0002] The fishing spear consists of a mandrel, round slips, a release ring and a guide shoe. It is a very good tool for fishing the downhole falling objects. When most of the existing fishing spears fish for the fish left in the well (drilling tools, etc. left in the well due to accidents), they often cooperate with the inner wall of the fish through the slips, clamp the slips in the fish, so as to fix the fish, and then take out the fish. However, during the taking-out process, in order to prevent the fish from falling off, the rotation of the fishing spear is prohibited. If the fishing spear loosens during the ascending process, it is difficult to have other protective devices to protect and fix the fish, and it is difficult to provide protection during the fishing process. It is not only difficult to ensure the safety of the fishing spear, but also easy to cause secondary damage to the fish when the fish falls off, thus bringing certain economic losses. Summary of the Invention

[0003] Based on the above problems, the purpose of the utility model is to provide a fishing spear with stable clamping and good anti-dropping performance.

[0004] For the above problems, the following technical solutions are provided: A fishing spear, including a mandrel, an upper joint connected to both ends of the mandrel, a guide shoe, a slip that fits with the serrated thread on the mandrel, and a release ring located at one end of the guide shoe facing the slip. It further includes a clamping mechanism. The clamping mechanism includes a driving frame and a clamping component. The driving frame includes a frame body located in the inner hole at the end of the mandrel, a connecting rod arranged in the radial direction of the mandrel and connected to the frame body, a driving block connected to the end of the connecting rod, and a transmission block fixed to the bottom end of the frame body. The driving block is located at the end where the slip and the mandrel cooperate. A chute for the driving block to reciprocate axially relative to the mandrel is opened on the outer circumferential wall of the mandrel. A support block corresponding to the driving block is arranged on the outer circumferential wall of the mandrel. A first return spring is arranged between the driving block and the support block. A limiting groove for limiting the driving block is opened in the inner hole at the bottom end of the slip. The clamping component includes a fixed block fixed to the bottom end of the mandrel, movable blocks and abutting blocks located on both sides of the fixed block. The movable blocks are located at the inner ends facing the central axis of the mandrel. A connecting column is connected to the movable blocks, and the other end of the connecting column penetrates the fixed block and is connected to the abutting blocks. A second return spring is sleeved on the connecting column and located between the movable blocks and the fixed block. The transmission block is in the shape of a frustum of a cone with a smaller bottom and a larger top. An abutting groove adapted to the outer wall of the transmission block is opened on one side of the movable block facing the transmission block. A communication hole is opened at a position on the guide shoe corresponding to the abutting block. The clamping component, the connecting rod, the driving block and the support block are arranged in three groups in the circumferential direction of the mandrel.

[0005] In the above structure, when the utility model enters the inner cavity of the fish, after rotating the mandrel so that the inner wall of the slip fits with the serrated thread on the mandrel, an upward lifting force is applied. The slip generates a radial force to clamp the inner wall of the fish. When the mandrel is lifted upward, a certain axial displacement is generated between the mandrel and the slip. Further, the limiting groove at the end of the slip controls the driving block to displace downward relative to the sliding groove. The transmission block is linked with the driving block through the frame body and displaces downward. The movable block realizes displacement in the radial direction relative to the mandrel by cooperating with the outer wall of the transmission block. Then, the abutting block is driven by the connecting column to displace outward through the communication hole to generate an abutting force on the inner wall of the fish, realizing the stability and reliability of the utility model when salvaging the fish. When the fish is taken out, a downward impact force is given to the mandrel in the axial direction relative to the slip. While the mandrel is reset, the driving block is reset through the first return spring. The driving block drives the frame body and the transmission block to displace upward for reset. Further, the movable block drives the abutting block to reset through the second return spring. After the mandrel rotates reversely relative to the slip for 2 - 3 turns, the utility model is taken out from the inner cavity of the fish. By setting the clamping mechanism, the cooperation strength of the utility model with the fish can be improved, thus playing a certain anti - detachment role during the rising of the fish and improving the reliability of the utility model. By setting three groups of clamping components, the tightening force can be increased, and the smoothness of tightening can be improved, thus improving the stability and anti - detachment property of the utility model for salvaging the fish. By setting the first return spring, the reset of the driving block is facilitated. By setting the second return spring, the reset of the movable block is facilitated.

[0006] The utility model is further configured such that a fixing column for sleeving the first return spring is provided on the support block.

[0007] In the above structure, by setting the fixing column, the installation and fixation of the first return spring are facilitated, thereby improving the convenience of installing the clamping mechanism.

[0008] The utility model is further configured such that a fixing hole adapted to the first return spring is formed on one side of the driving block facing the support block.

[0009] In the above structure, by setting the fixing hole, the stability of the first return spring can be further improved.

[0010] The utility model is further configured such that the frame body includes a fixing ring connected to the connecting rod and a fixing rod for connecting the fixing ring and the transmission block.

[0011] Adopting the above structure can facilitate the axial displacement of the frame body relative to the mandrel, and can not affect the communication between the inner hole of the mandrel and the inner hole of the pin, thereby not affecting the cleaning of the inner cavity of the fish and improving the reliability of the utility model.

[0012] The utility model is further configured such that three groups of the fixing rods are provided in the circumferential direction relative to the fixing ring.

[0013] With the above structure, the stability of the frame can be improved, thereby enhancing the structural strength of the clamping mechanism.

[0014] The present utility model is further configured such that two connecting columns are symmetrically arranged.

[0015] With the above structure, the connection strength between the movable block and the abutting block can be improved, and it is convenient for the movable block to drive the abutting block to reset, enhancing the reliability of the present utility model.

[0016] The present utility model is further configured such that friction lines are provided on the outer end face of the abutting block.

[0017] With the above structure, the abutting strength between the abutting block and the inner wall of the fish can be improved, thereby enhancing the anti - detachment effect of the present utility model. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 is a schematic structural diagram of the present utility model.

[0019] Figure 2 is a schematic cross - sectional structural diagram of the present utility model.

[0020] Figure 3 is Figure 2 an enlarged structural view of the structure at R in

[0021] Figure 4 is Figure 2 an enlarged structural view of the structure at S in

[0022] Figure 5 is a schematic structural diagram of a partial structure of the present utility model.

[0023] Figure 6 is a schematic structural diagram of the clamping mechanism of the present utility model.

[0024] The meanings of the reference numerals in the figures: 1 - mandrel; 2 - upper sub; 3 - guide shoe; 4 - slips; 5 - release collar; 6 - clamping mechanism; 61 - drive frame; 62 - clamping assembly; 611 - frame body; 612 - connecting rod; 613 - drive block; 614 - transmission block; 11 - chute; 12 - support block; 7 - first return spring; 41 - limit groove; 621 - fixed block; 622 - movable block; 623 - abutting block; 624 - connecting column; 8 - second return spring; 6221 - abutting groove; 31 - communication hole; 121 - fixed column; 6131 - fixing hole; 6111 - fixing ring; 6112 - fixing rod. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0025] The following will further describe in detail the specific implementation manners of the present utility model in conjunction with the accompanying drawings and embodiments. The following embodiments are used to illustrate the present utility model, but are not used to limit the scope of the present utility model.

[0026] It should be noted that all directional indications (such as up, down, left, right, front, back, the back surface...) in the embodiments of the present utility model are only used to explain the relative positional relationship and movement conditions between components in a specific posture (as shown in the accompanying drawings). If this specific posture changes, the directional indications will also change accordingly.

[0027] As Figures 1 to 6 shown, a fishing spear includes a mandrel 1, upper connectors 2 connected to both ends of the mandrel 1, a guide shoe 3, a slip 4 that mates with the serrated thread on the mandrel 1, and a release ring 5 located at one end of the guide shoe 3 facing the slip 4. It further includes a clamping mechanism 6. The clamping mechanism 6 includes a driving frame 61 and a clamping component 62. The driving frame 61 includes a frame body 611 located in the inner hole at the end of the mandrel 1, a connecting rod 612 arranged in the radial direction of the mandrel 1 and connected to the frame body 611, a driving block 613 connected to the end of the connecting rod 612, and a transmission block 614 fixed to the bottom end of the frame body 611. The driving block 613 is located at the end where the slip 4 and the mandrel 1 cooperate. A sliding groove 11 for the driving block 613 to reciprocate axially relative to the mandrel 1 is provided on the outer circumferential wall of the mandrel 1. A support block 12 corresponding to the driving block 613 is provided on the outer circumferential wall of the mandrel 1. A first return spring 7 is provided between the driving block 613 and the support block 12. A limiting groove 41 for limiting the driving block 613 is provided in the inner hole at the bottom end of the slip 4. The clamping component 62 includes a fixed block 621 fixed to the bottom end of the mandrel 1, movable blocks 622 and abutting blocks 623 located on both sides of the fixed block 621. The movable blocks 622 are located at the inner ends facing the central axis of the mandrel 1. A connecting column 624 is connected to the movable blocks 622. The other end of the connecting column 624 passes through the fixed block 621 and is connected to the abutting block 623. A second return spring 8 is sleeved on the connecting column 624 and is located between the movable blocks 622 and the fixed block 621. The transmission block 614 is in the shape of a frustum of a cone with a smaller bottom and a larger top. An abutting groove 6221 adapted to the outer wall of the transmission block 614 is provided on the side of the movable block 622 facing the transmission block 614. A communication hole 31 is provided at a position on the guide shoe 3 corresponding to the abutting block 623. The clamping component 62, the connecting rod 612, the driving block 613, and the support block 12 are arranged in three groups in the circumferential direction of the mandrel 1.

[0028] In the above structure, when the utility model enters the inner cavity of the fish, after rotating the mandrel 1 to make the inner wall of the slip 4 coincide with the serrated thread on the mandrel 1, an upward lifting force is applied. The slip 4 generates a radial force to clamp the inner wall of the fish. When the mandrel 1 is lifted upward, a certain axial displacement is generated between the mandrel 1 and the slip 4. Furthermore, the limiting groove 41 at the end of the slip 4 controls the downward displacement of the driving block 613 relative to the sliding groove 11. The transmission block 614 is linked with the driving block 613 through the frame body 611 and moves downward. The movable block 622 realizes the displacement in the radial direction relative to the mandrel 1 by cooperating with the outer wall of the transmission block 614. Then, the abutting block 623 is driven by the connecting column 624 to move outward through the communication hole 31 to generate an abutting force on the inner wall of the fish, realizing the stability and reliability of the utility model when fishing for the fish. When the fish is taken out, a downward impact force is given to the slip 4 in the axial direction relative to the mandrel 1. While the mandrel 1 is reset, the driving block 613 is reset by the first reset spring 7. The driving block 613 drives the frame body 611 and the transmission block 614 to move upward for reset. Furthermore, the movable block 622 drives the abutting block 623 to reset by the second reset spring 8. After the mandrel 1 rotates reversely relative to the slip 4 for 2 - 3 turns, the utility model is taken out from the inner cavity of the fish. By setting the clamping mechanism 6, the cooperation strength of the utility model with the fish can be improved, thus playing a certain anti - detachment role during the rising of the fish and improving the reliability of the utility model. By setting three groups of clamping components 62, the tightening force can be increased, and the smoothness of tightening can be improved, thereby improving the stability and anti - detachment property of the utility model for fishing the fish. By setting the first reset spring 7, the reset of the driving block 613 can be facilitated. By setting the second reset spring 8, the reset of the movable block 622 can be facilitated.

[0029] In this embodiment, a fixing column 121 for sleeving the first reset spring 7 is provided on the support block 12.

[0030] In the above structure, by setting the fixing column 121, the installation and fixation of the first reset spring 7 can be facilitated, thereby improving the convenience of installing the clamping mechanism 6.

[0031] In this embodiment, a fixing hole 6131 adapted to the first reset spring 7 is provided on one side of the driving block 613 facing the support block 12.

[0032] In the above structure, by setting the fixing hole 6131, the stability of the first reset spring 7 can be further improved.

[0033] In this embodiment, the frame body 611 includes a fixing ring 6111 connected to the connecting rod 612 and a fixing rod 6112 for connecting the fixing ring 6111 and the transmission block 614.

[0034] With the above structure, it is convenient for the frame body 611 to axially displace relative to the mandrel 1, and it does not affect the communication between the inner hole of the mandrel 1 and the inner hole of the pin, thus not affecting the cleaning of the inner cavity of the fish, and improving the reliability of the present utility model.

[0035] In this embodiment, three groups of the fixing rods 6112 are provided in the circumferential direction relative to the fixing ring 6111.

[0036] With the above structure, the stability of the frame body 611 can be improved, thereby improving the structural strength of the clamping mechanism 6.

[0037] In this embodiment, two connecting columns 624 are symmetrically arranged.

[0038] With the above structure, the connection strength between the movable block 622 and the abutting block 623 can be improved, and it is convenient for the movable block 622 to drive the abutting block 623 to reset, improving the reliability of the present utility model.

[0039] In this embodiment, friction lines are provided on the outer end surface of the abutting block 623.

[0040] With the above structure, the abutting strength between the abutting block 623 and the inner wall of the fish can be improved, thereby improving the anti - detachment effect of the present utility model.

[0041] The above are only the preferred embodiments of the present utility model. It should be noted that for those of ordinary skill in the art, without departing from the technical principle of the present utility model, several improvements and modifications can be made. These improvements and modifications should also be regarded as the protection scope of the present utility model.

Claims

1. A spear, comprising a mandrel, an upper joint connected to both ends of the mandrel, a guide shoe, a slip that matches the sawtooth thread on the mandrel, and a release ring located at the end of the guide shoe facing the slip, characterized in that: The cam is provided with a plurality of locking members, each of which is provided with a plurality of locking members, each of which is provided with a plurality of locking members, each of which is provided with a plurality of locking members, each of which is provided with a plurality of locking members, each of which is provided with a plurality of locking members. The clamping assembly includes a fixed block fixed to the bottom end of the core shaft and a movable block and an abutment block located on both sides of the fixed block. The movable block is located at the inner end facing the central axis of the core shaft. A connecting column is connected to the movable block. The other end of the connecting column passes through the fixed block and is connected to the abutment block. A second return spring located between the movable block and the fixed block is sleeved on the connecting column. The transmission block is a truncated cone with a small bottom and a large top. The movable block is provided with an abutment groove that is compatible with the outer wall of the transmission block on the side facing the transmission block. A connecting hole is provided on the guide shoe at a position corresponding to the abutment block. The clamping assembly, connecting rod, drive block and support block are arranged in three groups relative to the circumferential direction of the core shaft.

2. A spear fishing rod according to claim 1, characterized in that: The support block is provided with a fixing column for sleeve connection of the first return spring.

3. A spear fishing rod according to claim 2, characterized in that: A fixing hole matched with the first return spring is formed on one side of the driving block facing the supporting block.

4. A spear according to claim 1, characterized in that: The frame body comprises a fixing ring connected to the connecting rod and a fixing rod used for connecting the fixing ring and the transmission block.

5. A spear according to claim 4, characterized in that: The fixing rods are provided with three groups in the circumferential direction relative to the fixing ring.

6. A spear according to claim 1, characterized in that: Two connecting columns are symmetrically arranged.

7. A spear according to claim 1, characterized in that: The outer end surface of the abutment block is provided with friction lines.

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