A type of downhole, visible, and retractable salvage tool

Abstract

This utility model discloses a downhole visual and retractable retrieval tool, including a connecting component, an inner retrieval component, and an outer visual component. The outer visual component is fitted outside the connecting component, and the upper end of the inner retrieval component is connected to the lower end of the connecting component. A vision sensor is installed at the lower end of the outer visual component, and a cable channel is provided for leading the vision sensor cable out of the retrieval tool. The inner retrieval component is retracted inside the outer visual component, allowing for a clear line of sight. This utility model enables visual operation during retrieval, achieving a higher success rate compared to existing retrieval tools. It organically combines visual detection and retrieval operations, reducing operating costs and shortening the operation cycle.

Description

Technical Field

[0001] This utility model relates to the field of salvage tools, specifically a salvage tool that is visible and retractable underground. Background Technology

[0002] As most domestic oilfields transition to the mid-to-late stages of development, some problems have gradually emerged in the completed oil and gas wells. In particular, some early-stage production wells, due to their age, have experienced significant failures in their downhole production tubing strings, requiring retrieval and replacement. However, due to the complexity of downhole conditions, the top of the wellhead and its internal structure are often unclear. Operators can only rely on their experience to select retrieval tools for trial operations, resulting in a low success rate and frequent "empty runs." Sometimes, in complex downhole conditions, multiple "empty runs" occur, wasting considerable manpower, resources, and well-occupancy time. Therefore, there is a lack of a multi-functional tool that combines monitoring of the downhole well and the retrieval process with the actual retrieval operation, to improve the success rate.

[0003] Currently, downhole television is used in well workover operations only and cannot be combined with downhole fishing. This limits the support provided to on-site work. As is well known, fishing operations are time-sensitive. Each time the tubing string is lowered, it often has some impact on the fish that has fallen into the well. Fishing opportunities are fleeting, and if the opportunity is not seized, it may take several times longer to make up for it.

[0004] Announcement No. CN115626268B discloses a pull-line controlled retrieval device and its usage method, including a hinged arm fixed bracket, a hinged arm rotating bracket, and a gripping component. One end of the hinged arm rotating bracket is elastically hinged to one end of the hinged arm fixed bracket. The gripping component is detachably installed on the other end of the hinged arm rotating bracket via a quick connector. A rotating arm is installed on the side of the hinged arm rotating bracket near the gripping component. A first pull line for driving the hinged arm rotating bracket to rotate is connected to the rotating arm. A second pull line for pulling the gripping component to grab and retrieve the item is connected to the gripping component.

[0005] The field of view of the existing camera component is obstructed by the grasping component, making it impossible to clearly observe the state of the fish head of the falling object in the well.

[0006] Publication No. CN115263275A discloses a method for acquiring downhole fish data during well workover operations. The method includes capturing images of the downhole fish using a camera at the bottom of the workover tool; storing and processing the captured data in real time via a video information processing module connected to the camera; a storage and transmission module connected to the video information processing module is located above the video information processing module, and the video information processing module transmits data to the storage and transmission module for storage; the storage and transmission module transmits data to a wireless communication receiving device, the top of which is connected to a reel-in / reel-out rope, which is then retrieved from the well to remove the wireless communication receiving device from the oil well.

[0007] The existing technology's camera is located inside the fish-dropping connector, which obstructs the view and makes it impossible to clearly observe the state of the fish's top as it falls into the well.

[0008] Publication No. CN115680541A discloses a drill pipe retrieval device with visual function, including a retrieval drill pipe, a camera, and an imager. The retrieval drill pipe extends along a first direction and has a first end and a second end arranged opposite to each other. The interior of the retrieval drill pipe has a channel that runs through the retrieval drill pipe along the first direction. The first end of the retrieval drill pipe has a connector adapted to connect to the drill pipe to be retrieved. The camera is located in the channel and at the first end of the retrieval drill pipe. The imager is connected to the camera for displaying the image acquired by the camera.

[0009] The existing technology's camera is located inside the positioning cover, which obstructs the view and makes it impossible to clearly observe the state of the fish head when objects fall into the well.

[0010] In summary, the technical solutions, technical problems to be solved, and beneficial effects of the above-disclosed technologies are all different from those of this utility model. For more technical features, technical problems to be solved, and beneficial effects of this utility model, the above-disclosed technical documents do not provide any technical inspiration. Utility Model Content

[0011] In view of the above-mentioned defects in the existing technology, the purpose of this utility model is to provide a downhole visible and retractable salvage tool.

[0012] To achieve the above objectives, the present invention adopts the following technical solution:

[0013] A downhole retrieving tool with visibility and retraction includes a connecting component, an inner retrieving component, and an outer viewing component. The outer viewing component is fitted outside the connecting component, and the upper end of the inner retrieving component is connected to the lower end of the connecting component. A vision sensor is provided at the lower end of the outer viewing component, and a cable channel is provided in the outer viewing component to lead the cable of the vision sensor out of the retrieving tool. The inner retrieving component is retracted inside the outer viewing component to allow for line of sight.

[0014] Furthermore, the external visible component includes an outer cylinder, an electrical equipment slot is provided on the outer wall of the outer cylinder, a circuit board is provided in the electrical equipment slot, and the outer cylinder is sealed to the equipment sealing cylinder outside the electrical equipment cavity;

[0015] Specifically, the outer cylinder is provided with an upper cable channel and a lower cable channel that communicate with the electrical equipment slot. The cable includes an upper cable and a lower cable. The upper cable is provided in the upper cable channel and is connected to the circuit board. The lower cable is provided in the lower cable channel and is connected to the visual sensor provided at the port of the lower cable channel.

[0016] Furthermore, the connecting assembly includes an upper central tube, the lower end of which is connected to the inner retrieval assembly;

[0017] Specifically, the outer cylinder includes an upper outer cylinder and a lower outer cylinder;

[0018] Specifically, the upper inner wall of the upper outer cylinder is connected to a limiting cylinder, the inner wall of the limiting cylinder is slidably fitted with the outer wall of the upper central tube, and the lower end of the upper outer cylinder is connected to the lower outer cylinder;

[0019] Specifically, the outer wall of the lower outer cylinder is provided with an electrical equipment slot, the equipment sealing cylinder is connected to and sealed with the outer wall of the lower outer cylinder, the inner wall of the lower outer cylinder is provided with a downward-facing sixth positioning step, so that the inner wall of the lower outer cylinder has a small diameter at the top and a large diameter at the bottom, the small diameter part of the inner wall of the lower outer cylinder slides with the outer wall of the upper central tube, and the sixth positioning step sits on the upper end of the salvage assembly.

[0020] Furthermore, the upper outer cylinder and the lower outer cylinder are connected by a device sealing cylinder;

[0021] Specifically, the inner wall of the equipment sealing cylinder is connected to the lower outer wall of the upper outer cylinder, the inner wall of the equipment sealing cylinder is connected to the outer wall of the annular structure above the electrical equipment slot of the lower outer cylinder, and the lower end of the equipment sealing cylinder is connected to the lower part of the electrical equipment slot of the lower outer cylinder.

[0022] Furthermore, the lower outer cylinder has a first cable passage provided in the annular structure above the electrical equipment slot;

[0023] Specifically, the lower outer cylinder has a cable groove provided on its outer wall from the bottom up, and a second cable passage communicating with the cable groove is provided on the lower surface of the electrical equipment slot of the electrical equipment slot. The lower outer cylinder is connected to a cable sleeve and covers the cable groove.

[0024] Specifically, the lower inner diameter of the upper outer cylinder is greater than the maximum distance between the first cable passage and the axis of the lower outer cylinder;

[0025] Specifically, the upper cable channel includes an annular space between the upper outer cylinder and the upper central tube, and a first cable passage; the lower cable channel includes a second cable passage and a cable trough.

[0026] Furthermore, the visual sensor includes a miniature light source and a miniature camera;

[0027] Specifically, at least two cable trays are provided, and at least one miniature light source and at least one miniature camera are provided at the lower end of the at least two cable trays. The miniature light source and the miniature camera are respectively connected to the circuit board through the lower cable.

[0028] Specifically, the upper central tube is provided with a cable joint channel that is annularly connected to the upper outer cylinder and the upper central tube, and the upper cable passes through the cable joint channel and is connected to a cable wet joint inside the upper central tube.

[0029] Furthermore, the miniature light source and miniature camera are alternately arranged along the circumference of the lower outer cylinder;

[0030] Specifically, the upper cable is spirally wound in an annular manner between the upper outer cylinder and the upper central tube;

[0031] Specifically, a protective groove is provided on the lower end face of the lower outer cylinder in the cable groove, and the miniature light source and miniature camera are both located in the protective groove.

[0032] Furthermore, the internal salvage assembly includes a connecting cylinder, a salvage center rod, and a segmented anchor claw cylinder;

[0033] Specifically, the upper end of the connecting cylinder is connected to the lower end of the upper central tube, the outer wall of the salvage center rod is connected to the lower end of the connecting cylinder, the segmented anchor claw cylinder is sleeved on the outside of the salvage center rod, and the salvage center can open the segmented anchor claw cylinder.

[0034] Specifically, the segmented anchor claw cylinder is connected to the connecting cylinder through a lower reset mechanism, which includes a spring positioning ring, a lower reset spring, and a protective cylinder.

[0035] Specifically, the inner wall of the spring positioning ring is connected to the outer wall of the connecting cylinder, the lower return spring is sleeved on the outside of the connecting cylinder, the lower inner wall of the protective cylinder is connected to the upper outer wall of the split anchor claw cylinder, the upper end of the lower return spring is connected to the spring positioning ring, the lower end of the lower return spring is connected to the protective cylinder, and the lower return spring is in a stretched state.

[0036] Furthermore, at least one W-shaped track is provided on the outer wall of the salvage center rod, with the top of the middle part of the track being lower than the tops of the two sides.

[0037] Specifically, a ninth positioning step is provided at the upper end of the inner wall of the casing, and a rotating ring is rotatably provided between the upper end face of the split anchor claw cylinder and the ninth positioning step. The rotating ring is provided with a radial pin hole, and a displacement pin is provided in the pin hole. The displacement pin is inserted into the track.

[0038] Furthermore, the upper end of the upper central tube is connected to the top tube, the upper end of the top tube is connected to the upper connector, and an upper return spring is provided between the upper connector and the limiting cylinder. The upper return spring is in a compressed state, so that the lower outer cylinder sits on the upper end face of the connecting cylinder.

[0039] Compared with the prior art, the present invention has the following advantages:

[0040] 1. This utility model combines downhole exploration and retrieval tools.

[0041] 2. This utility model is installed at the lower end of the working tubing string. After being lowered to the predetermined position in the well via tubing, a cable with a wet connector is pumped into the tubing. The cable is then connected downhole to supply power to the electrical equipment of this utility model, enabling visual operation during fishing operations. Compared with various existing fishing tools, the success rate of fishing is higher. It achieves an organic combination of visual detection and fishing operations, reduces operating costs, and shortens the operation cycle.

[0042] 3. This utility model can be used for retrieving tubular objects such as oil pipes. This utility model can accurately retrieve objects from the top of the wellhead through visual observation. It also has a retractable function and can be widely used in well repair operations in oil fields. Attached Figure Description

[0043] Figure 1 This is a structural schematic diagram of a retractable, visible, and repositionable retrieval tool for wells, according to this utility model.

[0044] Figure 2 This is a schematic diagram of the upper connector 1 in this utility model.

[0045] Figure 3 This is a schematic diagram of the structure of the jacking pipe 2 in this utility model.

[0046] Figure 4 This is a schematic diagram of the structure of the upper central tube 4 in this utility model.

[0047] Figure 5 This is a schematic diagram of the structure of the limiting cylinder 5 in this utility model.

[0048] Figure 6 This is a schematic diagram of the upper outer cylinder 6 in this utility model.

[0049] Figure 7 This is a schematic diagram of the structure of the sealing cylinder 7 in this utility model.

[0050] Figure 8 This is a schematic diagram of the structure of the lower outer cylinder 8 in this utility model.

[0051] Figure 9 This is a schematic diagram of the spring positioning ring 11 in this utility model.

[0052] Figure 10 This is a schematic diagram of the connecting cylinder 14 in this utility model.

[0053] Figure 11 This is a schematic diagram of the structure of the protective sleeve 15 in this utility model.

[0054] Figure 12 This is a schematic diagram of the structure of the transfer ring 17 in this utility model.

[0055] Figure 13 This is a schematic diagram of the structure of the segmented anchor claw cylinder 18 in this utility model.

[0056] Figure 14 This is a schematic diagram of the structure of the retrieval center rod 19 in this utility model.

[0057] Figure 15 This is a schematic diagram of the cable sleeve 20 in this utility model.

[0058] Figure 16 This is a schematic diagram of the connection of the electrical equipment in this utility model.

[0059] In the diagram: upper connector 1, top tube 2, upper return spring 3;

[0060] Upper central tube 4, cable connector channel 4-1, axial groove 4-2, inner convex ring 4-3, first positioning step 4-4; limiting cylinder 5, spring positioning ring groove 5-1; upper outer cylinder 6, second positioning step 6-1, third positioning step 6-2; equipment sealing cylinder 7, first locking hole 7-1;

[0061] Lower outer cylinder 8, first cable passage 8-1, upper sealing ring groove 8-2, electrical equipment groove 8-3, lower groove surface of electrical equipment groove 8-4, lower sealing ring groove 8-5, fourth positioning step 8-6, fifth positioning step 8-7, second cable passage 8-8, sixth positioning step 8-9, cable passage 8-10, protective groove 8-11;

[0062] Circuit board 9, second pin 10, spring positioning ring 11; cable 12, cable wet connector 12-1, miniature light source 12-2, miniature camera 12-3; lower reset spring 13; connecting cylinder 14, seventh positioning step 14-1, eighth positioning step 14-2, protective cylinder 15, ninth positioning step 15-1; shift pin 16, swivel ring 17, pin hole 17-1;

[0063] Split anchor claw cylinder 18, split rod 18-1, upper engaging cone surface 18-2, inner claw surface 18-3, lower guide cone surface 18-4, outer claw surface 18-5;

[0064] Salvage center rod 19, tenth positioning step 19-1, track 19-2, transition cone surface 19-3, diameter reduction section 19-4, upper top cone surface 19-5, lower limit step 19-6, guide surface 19-7;

[0065] Cable sleeve 20, second locking hole 20-1. Detailed Implementation

[0066] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0067] Example 1:

[0068] Please see Figures 1 to 16 This embodiment provides a downhole visible and retractable retrieval tool, including a connecting component, an inner retrieval component, and an outer visual component. The outer visual component is fitted outside the connecting component. The upper end of the inner retrieval component is connected to the lower end of the connecting component. The outer visual component is equipped with a vision sensor at its lower end to obtain downhole conditions. The inner retrieval component is recessed inside the outer visual component to allow for line of sight. The outer visual component is provided with a cable channel to lead the cable 12 of the vision sensor out of the retrieval tool.

[0069] Furthermore, the external visual component includes an outer cylinder, the outer wall of which is provided with an electrical equipment slot 8-3, and a circuit board 9 is disposed inside the electrical equipment slot 8-3. The outer cylinder is sealed to the outside of the electrical equipment cavity 8-3 by an equipment sealing cylinder 7. The outer cylinder is provided with an upper cable channel and a lower cable channel communicating with the electrical equipment slot 8-3. The cable 12 includes an upper cable and a lower cable. The upper cable is disposed in the upper cable channel and is connected to the circuit board 9. The lower cable is disposed in the lower cable channel and connects the circuit board 9 to a visual sensor disposed at the port of the lower cable channel.

[0070] Furthermore, the connecting assembly includes an upper central tube 4, the lower end of which is connected to the inner retrieval assembly. The outer cylinder includes an upper outer cylinder 6 and a lower outer cylinder 8. A limiting cylinder 5 is threadedly connected to the inner wall of the upper end of the upper outer cylinder 6. The inner wall of the limiting cylinder 5 is slidably fitted with the outer wall of the upper central tube 4. The lower end of the upper outer cylinder 6 is connected to the lower outer cylinder 8. An electrical equipment slot 8-3 is provided on the outer wall of the lower outer cylinder 8. An equipment sealing cylinder 7 is connected to and seals the outer wall of the lower outer cylinder 8. A downward-facing sixth positioning step 8-9 is provided on the inner wall of the lower outer cylinder 8, making the inner wall of the lower outer cylinder 8 have a smaller diameter at the top and a larger diameter at the bottom. The smaller diameter portion of the inner wall of the lower outer cylinder 8 is slidably fitted with the outer wall of the upper central tube 4. The sixth positioning step 8-9 sits on the upper end of the retrieval assembly.

[0071] Specifically, the upper outer cylinder 6 and the lower outer cylinder 8 are connected by an equipment sealing cylinder 7. The inner wall of the equipment sealing cylinder 7 is threaded to the lower outer wall of the upper outer cylinder 6, and the inner wall of the equipment sealing cylinder 7 is threaded to the outer wall of the annular structure above the electrical equipment slot 8-3 of the lower outer cylinder 8. The lower end of the equipment sealing cylinder 7 is connected to the lower outer cylinder 8 by a locking pin. An upper sealing ring groove 8-2 is provided on the outer wall of the annular structure above the electrical equipment slot 8-3 of the lower outer cylinder 8, and a sealing ring is provided in the upper sealing ring groove 8-2 to seal with the equipment sealing cylinder 7. A lower sealing ring groove 8-5 is provided on the outer wall of the annular structure below the electrical equipment slot 8-3 of the lower outer cylinder 8. The lower end of the equipment sealing cylinder 7 is provided with a first locking hole 7-1, and the lower sealing ring groove 8-5 covers the first locking hole 7-1. The first locking hole 7-1 is provided with a first pin, which is inserted into the lower sealing ring groove 8-5. The lower sealing ring groove 8-5 is provided with a U-shaped sealing ring with an opening on the outer wall, which can both seal with the equipment sealing cylinder 7 and position the first pin. The outer wall of the upper outer cylinder 6 is provided with a downward-facing third positioning step 6-2, and the lower outer cylinder 8 is provided with an upward-facing fourth positioning step 8-6 below the lower sealing ring groove 8-5. The third positioning step 6-2 and the fourth positioning step 8-6 position the equipment sealing cylinder 7 during assembly.

[0072] Furthermore, the lower outer cylinder 8 has a first cable passage 8-1 in the annular structure above the electrical equipment slot 8-3, and a cable groove 8-10 is provided on the outer wall of the lower outer cylinder 8 from the lower end upwards. The lower outer cylinder 8 has a second cable passage 8-8 in the lower slot surface 8-4 of the electrical equipment slot 8-3, which communicates with the cable groove 8-10. The outer wall of the lower outer cylinder 8 is connected to the cable sleeve 20, which covers the cable groove 8-10. The lower inner diameter of the upper outer cylinder 6 is greater than the maximum distance between the first cable passage 8-1 and the axis of the lower outer cylinder 8. The annular space between the upper outer cylinder 6 and the upper central tube 4, the first cable passage 8-1, and the second cable passage 8-8 and the cable groove 8-10 form the lower cable passage.

[0073] Specifically, the upper cable passes through the first cable passage 8-1 and is then sealed with sealant, and the lower cable passes through the second cable passage 8-8 and is then sealed with sealant.

[0074] Specifically, the lower outer cylinder 8 has a downward-facing fifth positioning step 8-7 between the cable groove 8-10 and the fifth positioning step 8-7. The fifth positioning step 8-7 positions the cable sleeve 20 during assembly. The cable sleeve 20 has a second locking hole 20-1. A second pin 10 is provided in the second locking hole 20-1. The second pin is embedded in the outer wall of the lower outer cylinder 8, so that the cable sleeve 20 is connected to the lower outer cylinder 8.

[0075] Furthermore, the visual sensor includes a miniature light source 12-2 and a miniature camera 12-3. At least two cable troughs 8-10 are provided, and at least one miniature light source 12-2 and at least one miniature camera 12-3 are provided at the lower end of the at least two cable troughs 8-10. The miniature light source 12-2 and the miniature camera 12-3 are respectively connected to the circuit board 9 through the lower cable. The upper central tube 4 is provided with a cable connector channel 4-1 that is annularly connected to the upper outer cylinder 6 and the upper central tube 4. The upper cable passes through the cable connector channel 4-1 and is connected to the cable wet connector 12-1 inside the upper central tube 4.

[0076] Preferably, the miniature light source 12-2 and the miniature camera 12-3 are alternately arranged around the lower outer cylinder 8.

[0077] Specifically, the miniature light source 12-2, the miniature camera 12-3, and the lower cable are sealed with sealant, while the light-emitting mirror of the miniature light source 12-2 and the light-collecting mirror of the miniature camera 12-3 are exposed.

[0078] Specifically, the inner wall of the upper outer cylinder 6 is provided with an upward-facing second positioning step 6-1, and the upper cable is spirally wound between the upper outer cylinder 6 and the upper central tube 4 to accommodate cable expansion and contraction.

[0079] Specifically, the inner wall of the upper outer cylinder 6 is provided with an inner convex ring 4-3, and the inner wall of the inner convex ring 4-3 is provided with symmetrical axial grooves 4-2. The cable wet connector 12-1 is engaged in the inner convex ring 4-3, and the axial grooves 4-2 are flow channels.

[0080] Specifically, a protective groove 8-11 is provided on the lower end face of the lower outer cylinder 8 in the cable groove 8-10, and the miniature light source 12-2 and the miniature camera 12-3 are both located in the protective groove 8-11 to prevent them from being impacted.

[0081] Furthermore, the internal salvage assembly includes a connecting cylinder 14, a salvage center rod 19, and a split anchor claw cylinder 18. The upper inner wall of the connecting cylinder 14 is threadedly connected to the lower outer wall of the upper central tube 4. The upper outer wall of the salvage center rod 19 is threadedly connected to the lower inner wall of the connecting cylinder 14. The split anchor claw cylinder 18 is sleeved on the outside of the salvage center rod 19. The split anchor claw cylinder 18 is connected to the connecting cylinder 14 through a lower reset mechanism. After the split anchor claw cylinder 18 initially engages with the salvaged object, the salvage center rod 19 moves upward quickly, causing the split anchor claw cylinder 18 to open and complete the engagement with the salvaged object. When unlocking, the salvage center rod 19 moves downward, causing the split anchor claw cylinder 18 to retract. Then, it is slowly lifted upward, and the lower reset mechanism causes the split anchor claw cylinder 18 to detach from the salvaged object.

[0082] Specifically, the lower reset mechanism includes a spring positioning ring 11, a lower reset spring 13, and a protective sleeve 15. The inner wall of the spring positioning ring 11 is threadedly connected to the outer wall of the connecting cylinder 14. The lower reset spring 13 is sleeved on the outside of the connecting cylinder 14. The lower inner wall of the protective sleeve 15 is threadedly connected to the upper outer wall of the split anchor claw cylinder 18. The upper end of the lower reset spring 13 is welded to the spring positioning ring 11, and the lower end of the lower reset spring 13 is welded to the protective sleeve 15. The lower reset spring 13 is in a stretched state, and the upper end face of the protective sleeve 15 can contact the lower end face of the connecting cylinder 14 to achieve positioning.

[0083] Specifically, the inner wall of the connecting cylinder 14 is provided with an upward-facing seventh positioning step 14-1 to position the upper central tube 4, and the inner wall of the connecting cylinder 14 is provided with a downward-facing eighth positioning step 14-2 to position the retrieval central rod 19.

[0084] Specifically, the inner wall of the casing 15 is provided with a downward-facing ninth positioning step 15-1 and a positioning segmented anchor claw cylinder 18.

[0085] Specifically, the segmented anchor claw cylinder 18 includes a cylinder body, at least two segmented rods 18-1 are provided at the lower end of the cylinder body, the outer wall of the lower end of the segmented rod 18-1 is provided with a protruding outer claw surface 18-5, the upper end of the outer claw surface 18-5 is provided with an upper engaging cone surface 18-2, the lower end of the outer claw surface 18-5 is provided with a lower guide cone surface 18-4, the inner wall of the lower end of the segmented rod 18-1 is provided with a protruding inner claw surface 18-3, the outer claw surface 18-5 is provided with friction texture, and the upper engaging cone surface 18-2 is used to cooperate with the inner cone surface of the salvaged object and also plays a guiding role.

[0086] Specifically, the outer wall of the salvage center rod 19 is provided with an upward-facing tenth positioning step 19-1 for positioning the connecting cylinder 14. The salvage center rod 19 is provided with a reduced diameter section 19-4. The upper end of the reduced diameter section 19-4 is provided with a transition cone surface 19-3, and the lower end of the reduced diameter section 19-4 is provided with an upper top cone surface 19-5. The lower end of the upper top cone surface 19-5 is provided with an upward-facing lower limit step 19-6. The outer wall of the lower end of the salvage center rod 19 is provided with a guide surface 19-7. The outer diameter of the outer claw surface 18-5 is greater than the maximum outer diameter of the salvage center rod 19. The inner diameter of the inner claw surface 18-3 is greater than the inner diameter of the reduced diameter section 19-4. When the split anchor claw cylinder 18 is retracted, the outer diameter of the outer claw surface 18-5 is less than or equal to the maximum outer diameter of the salvage center rod 19. The upper top cone surface 19-5 contacts the inner claw surface 18-3, pushing the outer claw surface 18-5 outward.

[0087] It should be noted that the circuit board 9 is equipped with a control chip, which can encode and transmit camera information and control the brightness of the miniature light source 12-2 and the focal length of the miniature camera 12-3. The circuit board 9, the miniature light source 12-2, and the miniature camera 12-3 are all existing technologies and can be obtained by purchase. Those skilled in the art are clear about their structure and usage.

[0088] Example 2:

[0089] Based on Embodiment 1, in this embodiment, the upper outer wall of the upper central tube 4 is threadedly connected to the top tube 2, the upper outer wall of the top tube 2 is threadedly connected to the upper connector 1, and an upper return spring 3 is provided between the upper connector 1 and the limiting cylinder 5. When the upper return spring 3 is in a compressed state, the lower outer cylinder 8 sits on the upper end face of the connecting cylinder 14. When the lower outer cylinder 8 contacts the salvaged object and moves upward, the upper return spring 3 prevents the lower outer cylinder 8 from colliding with the upper connector 1, and when unlocked and lifted, the lower outer cylinder 8 automatically resets.

[0090] In this embodiment, at least one W-shaped track 19-2 with its ends connected is provided on the outer wall of the salvage center rod 19. The top of the middle part of the track 19-2 is lower than the top of the two sides. A rotating ring 17 is rotatably provided between the upper end face of the split anchor claw cylinder 18 and the ninth positioning step 15-1. The rotating ring 17 is provided with a radial pin hole 17-1. A displacement pin 16 is provided in the pin hole 17-1. The displacement pin 16 is inserted into the track 19-2. The lower reset mechanism makes the displacement pin 16 located at the top of the middle part or the top of the two sides of the track 19-2, so that the split anchor claw cylinder 18 can be adjusted to a preset position.

[0091] Example 3:

[0092] Based on Example 2, this example provides a method for assembling a downhole, visible, and retractable retrieval tool, including the following steps:

[0093] First, install the circuit board 9 with the cables 12 pre-connected at both ends on the outside of the lower outer cylinder 8. The upper cable at the upper end of the circuit board 9 passes through the first cable passage 8-1 at the upper end of the lower outer cylinder 8, and the multiple lower cables at the lower end of the circuit board 9 pass through the second cable passage 8-8 respectively and are placed in the cable groove 8-10 on the outer wall of the lower outer cylinder 8. Apply sealant to the first cable passage 8-1 and the second cable passage 8-8. Then, fit the equipment sealing cylinder 7 from top to bottom onto the outside of the lower outer cylinder 8 and connect it with threads. Secure it with the first pin. Then, connect the upper outer cylinder 6 and the equipment sealing cylinder 7 with threads to complete the connection of the external visible component.

[0094] Then, the rotating ring 17 and the segmented anchor claw cylinder 18 are sequentially fitted onto the outer wall of the salvage center rod 19 from top to bottom. The rotating ring 17 is then installed in the track 19-2 on the outer wall of the salvage center rod 19 using the shifting pin 16. The protective cylinder 15 is then fitted onto the outer wall of the salvage center rod 19 from top to bottom and connected to the segmented anchor claw cylinder 18 by threads. The connecting cylinder 14 is then connected to the salvage center rod 19 by threads. The lower return spring 13 is fitted onto the outer wall of the connecting cylinder 14. The spring positioning ring 11 is threaded onto the connecting cylinder 14. The lower return spring 13 is welded to the spring positioning ring 11. The lower return spring 13 is stretched and then welded to the protective cylinder 15 to complete the connection of the inner salvage assembly.

[0095] Next, the upper central tube 4, which passes through the interior of the outer parts string, is connected to the connecting cylinder 14 at the upper end of the lower parts string by thread. At this time, the upper cable of the upper part of the circuit board 9 passes through the upper central tube 4 and is placed inside the upper central tube 4 through the cable connector channel 4-1, and connected to the cable wet connector 12-1. The cable that is in the loop between the upper central tube 4 and the upper outer cylinder 6 is spirally wound. Then, the top tube 2 is connected to the upper central tube 4 by thread. Then, the limiting cylinder 5 and the upper return spring 3 are successively fitted onto the outer wall of the top tube 2, and the limiting cylinder 5 is connected to the upper outer cylinder 6 by thread. The upper connector 1 is threaded to the top tube 2. Finally, the cable sleeve 20 is fitted onto the outer wall of the lower outer cylinder 8 from bottom to top and fixed by the second pin 10 to complete the assembly of a downhole visible and retractable fishing tool.

[0096] Example 4:

[0097] Based on Example 2, this example provides a method for using a downhole, retractable, and visible retrieval tool, including the following steps:

[0098] First, connect the retrieval tool to the bottom of the retrieval string and lower it to the predetermined position downhole. Then, pump the cable wet connector from the tubing and connect it to the reserved cable wet connector 12-1 in the tool for power supply. After the connection is made and the downhole image is obtained on the ground, the retrieval operation can be carried out.

[0099] The tubing string is lowered to a certain tonnage. The falling object in the well pushes the outer cylinder upward. The head of the retrieval center rod 19 enters the predetermined depth of the falling object's inner cavity and encounters resistance. The split anchor claw cylinder 18 retracts into the falling object's inner cavity. The tubing string is quickly lifted, and the retrieval center rod 19 and the split anchor claw cylinder 18 move upward at a differential speed. The upper engaging cone surface 18-2 of the split anchor claw cylinder 18 engages with the cone surface of the falling object's inner cavity, causing the split anchor claw cylinder 18 to decelerate upon encountering resistance. The upper top cone surface 19-5 of the retrieval center rod 19 pushes out the inner claw surface 18-3 and outer claw surface 18-5 of the split anchor claw cylinder 18, locking the split anchor claw cylinder 18 with the falling object. The tubing string is then lifted to retrieve the falling object, completing the retrieval operation.

[0100] If insufficient lifting force or other unexpected situations prevent the tubing from being retrieved from the wellbore, the tubing should be pressed down to disengage the center rod 19 from the split anchor claw cylinder 18. The split anchor claw cylinder 18 should be disconnected from the fallen object. The tubing should be slowly lifted up, and the lower return spring 13 should be used to pull the split anchor claw cylinder 18 away from the fallen object. Then the working tubing can be retrieved.

[0101] All components not discussed in detail in this application, as well as the connection methods of these components, are well-known technologies in this field. They can be directly applied and will not be elaborated further.

[0102] In this utility model, the term "multiple" refers to two or more unless otherwise explicitly defined. The terms "installation," "connection," "linking," and "fixing," etc., should be interpreted broadly. For example, "connection" can be a fixed connection, a detachable connection, or an integral connection; "linking" can be a direct connection or an indirect connection through an intermediate medium. Those skilled in the art can understand the specific meaning of the above terms in this utility model according to the specific circumstances.

[0103] In the description of this utility model, it should be understood that the terms "upper", "lower", "left", "right", "front", "rear", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or unit referred to must have a specific orientation or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this utility model.

[0104] In the description of this specification, the terms "one embodiment," "some embodiments," "specific embodiment," etc., refer to a specific feature, structure, material, or characteristic described in connection with that embodiment or example, which is included in at least one embodiment or example of the present invention. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples.

[0105] The above description is merely a preferred embodiment of this utility model and is not intended to limit the utility model. Various modifications and variations can be made to this utility model by those skilled in the art. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this utility model should be included within the protection scope of this utility model.

Claims

1. A downhole, retractable, and visually accessible retrieval tool, comprising a connecting assembly and an internal retrieval assembly, characterized in that, It also includes external visual components; The external visual component is fitted outside the connecting component, and the upper end of the internal retrieval component is connected to the lower end of the connecting component. The external visual component has a visual sensor at its lower end and a cable channel for leading the cable of the visual sensor out of the retrieval tool. The internal retrieval component is recessed inside the external visible component, thus eliminating the need for a line of sight.

2. The downhole visible and retractable salvage tool according to claim 1, characterized in that, The external visible component includes an outer cylinder, an electrical equipment slot is provided on the outer wall of the outer cylinder, a circuit board is provided in the electrical equipment slot, and the outer cylinder is sealed to the equipment sealing cylinder outside the electrical equipment cavity; The outer cylinder is provided with an upper cable channel and a lower cable channel that communicate with the electrical equipment slot. The cable includes an upper cable and a lower cable. The upper cable is provided in the upper cable channel and is connected to the circuit board. The lower cable is provided in the lower cable channel and is connected to the visual sensor provided at the port of the lower cable channel.

3. The downhole visual and retractable salvage tool according to claim 2, characterized in that, The connecting assembly includes an upper central tube, the lower end of which is connected to the inner retrieval assembly. The outer cylinder includes an upper outer cylinder and a lower outer cylinder; The upper outer cylinder is connected to the inner wall of the upper end of the limiting cylinder, and the inner wall of the limiting cylinder is slidably engaged with the outer wall of the upper central tube. The lower end of the upper outer cylinder is connected to the lower outer cylinder. The outer wall of the lower outer cylinder is provided with an electrical equipment slot. The equipment sealing cylinder is connected to and sealed to the outer wall of the lower outer cylinder. The inner wall of the lower outer cylinder is provided with a downward-facing sixth positioning step, so that the inner wall of the lower outer cylinder has a small diameter at the top and a large diameter at the bottom. The small diameter part of the inner wall of the lower outer cylinder slides with the outer wall of the upper central tube. The sixth positioning step sits on the upper end of the salvage assembly.

4. The downhole visual and retractable salvage tool according to claim 3, characterized in that, The upper outer cylinder and the lower outer cylinder are connected by a sealing cylinder. The inner wall of the equipment sealing cylinder is connected to the lower outer wall of the upper outer cylinder, the inner wall of the equipment sealing cylinder is connected to the outer wall of the annular structure above the electrical equipment slot of the lower outer cylinder, and the lower end of the equipment sealing cylinder is connected to the lower part of the electrical equipment slot of the lower outer cylinder.

5. The downhole visual and retractable salvage tool according to claim 3, characterized in that, The lower outer cylinder has a first cable passage in the annular structure above the electrical equipment slot; The lower outer cylinder has a cable groove provided from the bottom to the top on its outer wall. The lower outer cylinder has a second cable passage that communicates with the cable groove on the lower surface of the electrical equipment slot. The lower outer cylinder is connected to a cable sleeve that covers the cable groove. The inner diameter of the lower end of the upper outer cylinder is greater than the maximum distance between the first cable passage and the axis of the lower outer cylinder; The upper cable channel includes an annular space between the upper outer cylinder and the upper central tube, and a first cable passage; The lower cable channel includes a second cable passage and a cable trough.

6. The downhole visual and retractable salvage tool according to claim 5, characterized in that, The visual sensor includes a miniature light source and a miniature camera; At least two cable trays are provided, and at least one miniature light source and at least one miniature camera are provided at the lower end of the at least two cable trays. The miniature light source and the miniature camera are respectively connected to the circuit board through the lower cable. The upper central tube is provided with a cable joint channel that is annularly connected to the upper outer cylinder and the upper central tube. The upper cable passes through the cable joint channel and is connected to a cable wet joint inside the upper central tube.

7. A downhole, retractable, and visually accessible salvage tool according to claim 6, characterized in that, The miniature light source and miniature camera are alternately arranged along the circumference of the lower outer cylinder; The upper cable is spirally wound in an annular shape between the upper outer cylinder and the upper central tube; The lower end face of the lower outer cylinder is provided with a protective groove in the cable groove, and the miniature light source and miniature camera are both located in the protective groove.

8. A downhole, retractable, and visually accessible salvage tool according to claim 3, characterized in that, The internal salvage assembly includes a connecting cylinder, a salvage center rod, and a segmented anchor claw cylinder; The upper end of the connecting cylinder is connected to the lower end of the upper central tube, the outer wall of the salvage center rod is connected to the lower end of the connecting cylinder, the segmented anchor claw cylinder is sleeved on the outside of the salvage center rod, and the salvage center can open the segmented anchor claw cylinder. The segmented anchor claw cylinder is connected to the connecting cylinder through a lower reset mechanism, which includes a spring positioning ring, a lower reset spring, and a protective cylinder. The inner wall of the spring positioning ring is connected to the outer wall of the connecting cylinder. The lower return spring is sleeved on the outside of the connecting cylinder. The lower inner wall of the protective cylinder is connected to the upper outer wall of the split anchor claw cylinder. The upper end of the lower return spring is connected to the spring positioning ring. The lower end of the lower return spring is connected to the protective cylinder. The lower return spring is in a stretched state.

9. A downhole, retractable, and visually accessible salvage tool according to claim 8, characterized in that, The outer wall of the salvage center pole is provided with at least one W-shaped track that is connected end to end, and the top of the middle part of the track is lower than the tops of the two sides. The upper end of the inner wall of the casing is provided with a ninth positioning step. A rotating ring is rotatably provided between the upper end face of the split anchor claw cylinder and the ninth positioning step. The rotating ring is provided with a radial pin hole. A displacement pin is provided in the pin hole and is inserted into the track.

10. A downhole, retractable, and visually accessible salvage tool according to claim 3, characterized in that, The upper central tube is connected to the top tube at its upper end, and the upper outer wall of the top tube is connected to the upper connector. An upper return spring is provided between the upper connector and the limiting cylinder. When the upper return spring is in a compressed state, the lower outer cylinder sits on the upper end face of the connecting cylinder.

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