Optical cable through fishing anti-falling device and use method

Abstract

The present application belongs to the technical field of oilfield geological exploration, and specifically discloses a device for preventing a fiber-optic cable from falling into a well during fishing and a use method, which comprises: a C-shaped anti-falling tray and a C-shaped anti-falling chuck; the fiber-optic cable penetrates through the C-shaped anti-falling chuck and the anti-falling tray; the anti-falling tray is arranged on the C-shaped anti-falling chuck; the device for preventing a fiber-optic cable from falling into a well is connected to the fiber-optic cable, one end of the fiber-optic cable is connected to a fishing barrel and drilling tools, and the device for preventing a fiber-optic cable from falling into a well is deep into the downhole for fishing through a quick connecting device; when the fiber-optic cable at the upper part of the quick connecting device is broken during the fishing process, the quick connecting device and the fiber-optic cable can only fall on the anti-falling tray, the anti-falling tray is captured by the C-shaped anti-falling chuck in the drilling tools, and will not fall into the well bottom again, causing secondary falling into the well and accumulation of the fiber-optic cable in the well, and increasing the difficulty of fishing operation. The fiber-optic cable and the quick connecting device that fall into the well can be captured by lifting the drilling tools in the well; and secondary breaking and falling into the well during the fishing process of the fiber-optic cable are prevented, and safety accidents are avoided.

Description

Technical Field

[0001] This invention belongs to the field of oilfield geological exploration technology, specifically relating to a fiber optic cable core-through retrieval device to prevent falling into wells and its usage method. Background Technology

[0002] Fiber optic logging offers advantages such as embedded, non-destructive, full-space, and full-time-domain dynamic monitoring of oil wells. However, due to its long operating time, it is prone to sticking and getting stuck in the well, leading to damage to the fiber optic cable and accidents where the cable falls into the well. There is no anti-fall-in device during the fiber optic cable retrieval operation, which can easily cause secondary accidents such as the logging fiber optic cable falling into the well, increasing the difficulty of the retrieval operation and causing incalculable adverse consequences for subsequent operations.

[0003] The existing retrieval process is prone to secondary breakage of the optical cable. If the optical cable breaks during the retrieval process, it will fall to the bottom of the well again, causing secondary fall-in-well accidents and accumulation of optical cable in the well, which increases the difficulty of the retrieval operation. Summary of the Invention

[0004] In order to overcome the shortcomings of the existing technology, the purpose of this invention is to provide a fiber optic cable core-through retrieval anti-fall-into-well device and its usage method, so as to solve the problem that the fiber optic cable is prone to secondary breakage and falling to the bottom of the well again during the existing retrieval process, causing secondary fall-in-well accidents and increasing the difficulty of retrieval operations.

[0005] To achieve the above objectives, the present invention employs the following technical solution:

[0006] On one hand, the present invention provides a device for preventing optical cables from falling into wells during retrieval, comprising:

[0007] Anti-detachment tray and C-type anti-detachment chuck; optical cable passes through the C-type anti-detachment chuck and anti-detachment tray; anti-detachment tray is installed on the C-type anti-detachment chuck;

[0008] It also includes a retrieval tube, drilling tools, a C-type quick-connect chuck, a quick-connect device, a weight rod, and a winch. In use, the optical cable is divided into an upper optical cable and a lower optical cable. One end of the lower optical cable is connected to the logging instrument. The retrieval tube is fixedly connected to the drilling tools, and the retrieval tube and drilling tools are located on the outside of the lower optical cable. The C-type anti-drop chuck and anti-drop tray are located inside the drilling tools. The C-type quick-connect chuck is located at the wellhead. The other end of the lower optical cable passes through the C-type quick-connect chuck and is connected to one end of the quick-connect device. The other end of the quick-connect device is connected to one end of the upper optical cable. The other end of the quick-connect device is also connected to one end of the weight rod. The other end of the upper optical cable is connected to the winch.

[0009] The quick-connect device includes a male quick-connect device connector and a female quick-connect device connector. The male quick-connect device connector is connected to the other end of the lower optical cable, and the female quick-connect device connector is connected to one end of the upper optical cable.

[0010] Furthermore, it also includes anti-detachment tray fixing bolts. The anti-detachment tray has a two-part structure, and the anti-detachment tray fixing bolts combine the two parts of the anti-detachment tray into a whole.

[0011] Furthermore, the center of the anti-drop tray is provided with an anti-drop tray optical cable center hole, in which the optical cable moves up and down; around the anti-drop tray optical cable center hole, there are also multiple anti-drop tray water holes designed for drilling fluid to pass through.

[0012] Furthermore, it also includes shear screw mounting holes, shear screws, and shear rings; the shear screws are connected to the shear rings on the C-type anti-drop chuck via the shear screw mounting holes on the anti-drop tray.

[0013] Furthermore, it also includes casing, which is fixed inside the wellhead.

[0014] Furthermore, it also includes a top pulley, a tension meter, and a bottom pulley; the other end of the upper optical cable is sequentially connected to the top pulley and the bottom pulley, and the tension meter is connected to the top pulley.

[0015] Furthermore, the drilling tools include a first drill string and a second drill string. One end of the first drill string is fixedly connected to the retrieval cylinder, and one end of the second drill string is connected to the other end of the first drill string. The other end of the second drill string is connected to a C-type quick-access wellhead chuck. Both the first and second drill strings are equipped with water holes.

[0016] Furthermore, the female connector of the quick-connect device is provided with a quick-connect female connector middle connector and a monk head mounting groove, and the male connector of the quick-connect device is provided with a quick-connect male connector middle connector and a quick-connect male monk head; the upper optical cable is riveted to the female connector of the quick-connect device, the lower optical cable is riveted to the male connector of the quick-connect device, the quick-connect female connector middle connector is connected to the quick-connect male connector middle connector, and the quick-connect male monk head is connected to the monk head mounting groove.

[0017] Furthermore, both the male and female connectors of the quick-connect device are equipped with an optical cable fixing cap, a first conical sleeve of the optical cable outer armor, a second conical sleeve of the optical cable outer armor, and a third conical sleeve of the optical cable outer armor. The optical cable fixing cap is located on the outside of the first conical sleeve of the optical cable outer armor, the first conical sleeve of the optical cable outer armor is located on the outside of the second conical sleeve of the optical cable outer armor, and the second conical sleeve of the optical cable outer armor is located on the outside of the third conical sleeve of the optical cable outer armor. The optical cable passes through the inside of the optical cable fixing cap, the first conical sleeve of the optical cable outer armor, the second conical sleeve of the optical cable outer armor, and the third conical sleeve of the optical cable outer armor.

[0018] Secondly, the present invention provides a method for using a fiber optic cable core-through retrieval and well-fall-off prevention device, the fiber optic cable core-through retrieval and well-fall-off prevention device based on any one of the above-mentioned methods comprising:

[0019] S1: Conduct a tensile test on the optical cable;

[0020] S2: Clamp the lower optical cable with a T-clamp and place it on the wellhead seat. Loosen the optical cable to separate the male and female ends of the quick-connect device. Lift the upper optical cable to raise the weight rod and the main body of the quick-connect device to the appropriate height.

[0021] S3: Connect the retrieval tube to the drill string, lift it up to raise the drill string and the connected retrieval tube into a suspended state; insert the quick-connect device into the drill string to be drilled; lower the optical cable until the female end of the quick-connect device comes out from the bottom of the retrieval tube and can be connected with the male end of the quick-connect device.

[0022] S4: Connect the upper and lower parts of the quick connection device, lift the optical cable, and remove the T-type card after the T-type card leaves the wellhead seat.

[0023] S5: Lower the optical cable to allow the male connector of the quick-connect device to sit in the C-type quick-connect wellhead chuck; Lower the optical cable to disengage the female connector of the quick-connect device from the male connector of the quick-connect device.

[0024] S6: Lower the retrieval cylinder and drill string into the well; pass the fiber optic cable through the opening of the C-type anti-drop chuck and install the C-type anti-drop chuck inside the drill string;

[0025] S7: Connect the female and male quick-connect devices and lift the optical cable; place the C-type anti-drop chuck inside the drill string; install the anti-drop tray, place the optical cable inside the anti-drop tray, and place the anti-drop tray inside the C-type anti-drop chuck; install the anti-drop device consisting of the C-type anti-drop chuck and the anti-drop tray inside the drill string, press the C-type anti-drop chuck into the well along with the drill string;

[0026] After installing the anti-fall-off device, the winch is raised to retrieve the fallen fiber optic cable. Once the instrument has entered the retrieval cylinder, the fiber optic cable is lifted. The anti-fall-off tray moves together with the fiber optic cable inside the drill string under the upward force until the fallen fiber optic cable enters the drill string.

[0027] The present invention has at least the following beneficial effects:

[0028] 1. This invention connects an anti-fall-in device to an optical cable, with one end of the cable connected to a retrieval cylinder and drilling tools. The anti-fall-in device is then lowered into the well for retrieval via a quick-connect device. If the optical cable above the quick-connect device breaks during retrieval, both the device and the cable will fall onto an anti-fall-in tray. This tray is then captured by a C-shaped anti-fall-in chuck inside the drilling tools, preventing it from falling back to the bottom of the well and causing secondary falls or cable accumulation, which would increase the difficulty of the retrieval operation. The fallen cable and quick-connect device can be retrieved simply by pulling out the drilling tools, thus eliminating the safety hazards of secondary breakage and fall-in during cable retrieval.

[0029] 2. In this invention, the quick-connect male and female heads can be installed into the male head mounting slot, achieving a quick connection while meeting the requirements in terms of tensile strength, thus simplifying the installation of the retrieval cylinder and the drilling process.

[0030] 3. In this invention, multiple anti-drop tray water holes are also designed around the center hole of the anti-drop tray optical cable to ensure that drilling fluid can pass through without affecting the well washing operation.

[0031] 4. In this invention, the optical cable must be cut during the installation of the retrieval cylinder to prevent the cut optical cable from falling into the well. Before cutting the optical cable, the lower optical cable must be fixed with a T-shaped clamp. The T-shaped clamp sits on the wellhead seat to ensure that the lower optical cable will not fall into the well under the action of gravity. Attached Figure Description

[0032] The accompanying drawings, which form part of this specification, are used to provide a further understanding of the invention. The illustrative embodiments of the invention and their descriptions are used to explain the invention and do not constitute an undue limitation of the invention. In the drawings:

[0033] Figure 1 This is a schematic diagram of the overall structure of the present invention;

[0034] Figure 2 A schematic diagram of a fiber optic cable retrieval and well-prevention device.

[0035] Figure 3 Schematic diagram of C-type anti-drop chuck structure;

[0036] Figure 4 Schematic diagram of the anti-fall-off pallet structure;

[0037] Figure 5 A schematic diagram of the quick-connect female connector structure;

[0038] Figure 6 This is a schematic diagram of a quick-connect male connector structure.

[0039] Reference numerals: 1. Well-falling instrument; 2. Optical cable; 3. Salvage tube; 4. Drilling tool; 5. C-type anti-drop chuck; 6. Anti-drop tray; 7. Casing; 8. C-type quick-connect wellhead chuck; 9. Quick-connect device male connector; 10. Quick-connect device female connector; 11. Weight rod; 12. Top pulley; 13. Tension gauge; 14. Bottom pulley; 15. Winch; 16. Shear screw mounting hole; 17. Shear screw; 18. Shear ring; 19. Anti-drop tray fixing bolt; 20. Anti-drop tray water eye; 21. Anti-drop tray optical cable center hole; 22. Optical cable fixing cap; 23. First cone sleeve of optical cable outer armor; 24. Second cone sleeve of optical cable outer armor; 25. Third cone sleeve of optical cable outer armor; 26. Middle connector of quick-connect female connector; 27. Monk head mounting groove; 28. Middle connector of quick-connect male connector; 29. ​​Quick-connect male connector and monk head. Detailed Implementation

[0040] The present invention will now be described in detail with reference to the accompanying drawings and embodiments. It should be noted that, unless otherwise specified, the embodiments and features described herein can be combined with each other.

[0041] The following detailed description is exemplary and intended to provide further detailed explanation of the invention. Unless otherwise specified, all technical terms used in this invention have the same meaning as commonly understood by one of ordinary skill in the art. The terminology used in this invention is for describing particular embodiments only and is not intended to limit the scope of exemplary embodiments according to the invention.

[0042] Example 1

[0043] like Figures 2-4 As shown, a fiber optic cable retrieval and well-prevention device includes:

[0044] The system includes an anti-drop tray 6, anti-drop tray fixing bolts 19, and a C-type anti-drop chuck 5. The anti-drop tray 6 has a center hole 21 for the optical cable, allowing the optical cable 2 to move up and down within the center hole 21. The anti-drop tray 6 has a two-part structure, which is assembled into a single unit using the anti-drop tray fixing bolts 19. The anti-drop tray 6 is mounted on the C-type anti-drop chuck 5.

[0045] Two shear screws 17 are connected to the shear rings 18 on the C-type anti-drop chuck 5 through the shear screw mounting holes 16 on the anti-drop tray 6.

[0046] The center hole 21 of the anti-drop tray optical cable is also designed with multiple anti-drop tray water holes 20 around it to ensure that drilling fluid can pass through without affecting the well washing operation.

[0047] like Figure 1 As shown, in use, the optical cable 2 is divided into an upper optical cable and a lower optical cable; one end of the lower optical cable is connected to the logging instrument 1, the retrieval tube 3 is fixedly connected to the drill string 4, the retrieval tube 3 and the drill string 4 are set outside the lower optical cable, the C-type anti-drop chuck 5 and the anti-drop tray 6 are set inside the drill string 4, the anti-drop tray 6 is set on the upper part of the C-type anti-drop chuck 5, and the casing 7 is fixed inside the wellhead; the C-type quick wellhead chuck 8 is set at the wellhead, the other end of the lower optical cable passes through the C-type quick wellhead chuck 8 and is connected to one end of the quick connection device, the other end of the quick connection device is connected to one end of the upper optical cable, the other end of the quick connection device is also connected to one end of the weight rod 11, the other end of the upper optical cable is sequentially connected to the top pulley 12 and the bottom pulley 14, the top pulley 12 is connected to the tension gauge 13, and the other end of the upper optical cable is connected to the winch 15.

[0048] The quick-connect device includes a quick-connect male connector 9 and a quick-connect female connector 10. The quick-connect male connector 9 is connected to the other end of the lower optical cable, and the quick-connect female connector 10 is connected to one end of the upper optical cable.

[0049] The drilling tool 4 includes a first drill string and a second drill string. One end of the first drill string is fixedly connected to the retrieval tube 3, and one end of the second drill string is connected to the other end of the first drill string. The other end of the second drill string is connected to the C-type quick-access wellhead chuck 8. Both the first and second drill strings are equipped with water holes.

[0050] The fiber optic cable retrieval anti-fall-off device is installed inside the second drill string. The inner diameter of the drill string coupling is larger than the inner diameter of the water hole, and it has a reduced diameter structure. The upper part of the anti-fall-off device has a larger outer diameter than the lower part. After installation, the lower part is inside the drill string water hole, and the upper part is inside the drill string coupling. The thickness of the drill string is slightly smaller than the thickness of the C-type anti-fall-off chuck 5. After the second drill string is installed, it can fix the C-type anti-fall-off chuck 5 to prevent longitudinal displacement. When the fiber optic cable 2 is pulled up, the anti-fall-off chuck 5 also moves accordingly. When the pulling force exceeds the breaking force of the shear screw 17, the shear screw 17 breaks, and the C-type anti-fall-off chuck 5 moves together with the retrieved fiber optic cable inside the drill string water hole.

[0051] like Figures 5-6 As shown, the quick-connect device female head 10 is provided with a quick-connect female head connector 26 and a monk head mounting groove 27, and the quick-connect device male head 9 is provided with a quick-connect male head connector 28 and a quick-connect male head monk head 29. After the upper optical cable is cut, it needs to be riveted to the quick-connect device female head 10, and the lower optical cable needs to be riveted to the quick-connect device male head 9. The quick-connect female head connector 26 is connected to the quick-connect male head connector 28, and the quick-connect male head monk head 29 is connected to the monk head mounting groove 27, which plays a role in quick connection. At the same time, the tensile force can meet the requirements, simplifying the installation of the retrieval tube and the drilling tool lowering process.

[0052] Both the male connector 9 and the female connector 10 of the quick-connect device are equipped with an optical cable fixing cap 22, an optical cable outer armor first cone sleeve 23, an optical cable outer armor second cone sleeve 24, and an optical cable outer armor third cone sleeve 25. The optical cable fixing cap 22 is located outside the optical cable outer armor first cone sleeve 23, the optical cable outer armor first cone sleeve 23 is located outside the optical cable outer armor second cone sleeve 24, and the optical cable outer armor second cone sleeve 24 is located outside the optical cable outer armor third cone sleeve 25. The optical cable 2 passes through and is installed inside the optical cable fixing cap 22, the optical cable outer armor first cone sleeve 23, the optical cable outer armor second cone sleeve 24, and the optical cable outer armor third cone sleeve 25.

[0053] Example 2

[0054] A method for using a fiber optic cable core-through retrieval and well-prevention device includes:

[0055] S1: Conduct a tensile test on optical cable 2;

[0056] During the retrieval operation, first use winch 15 to lift the optical cable 2, ensuring it is taut. Secure the optical cable 2 with T-clamps, then lower the optical cable 2 so that the T-clamps sit on the wellhead seat. If the optical cable 2 does not move longitudinally, it proves that the T-clamps have firmly secured the sensing optical cable 2. When installing the retrieval cylinder, the optical cable 2 must be cut to prevent it from falling into the well. Before cutting the optical cable, use T-clamps to secure the lower part of the optical cable, ensuring that the T-clamps sit on the wellhead seat and do not fall into the well under gravity.

[0057] After securing optical cable 2 with T-clamps, cut it in the middle. Rivet the lower part of the optical cable to the male connector 9 of the quick-connect device, and rivet the upper part to the female connector 10 of the quick-connect device. Install a weighted rod 11 on the female connector 10. Its function is to ensure that the upper optical cable 2 remains taut and vertical when the retrieval cylinder is installed, preventing it from slipping off the pulley 12 during the lifting process.

[0058] Connect the male connector 9 and female connector 10 of the quick-connect device. Use the winch 15 to slowly pull up the optical cable 2 to perform a tension test, and use a marking method to confirm whether the joint is securely connected. Mark the clamping point between the T-clamp and the sensing optical cable 2. Raise the winch to make the tension of the optical cable 2 exceed 2 tons, and then lower the optical cable 2 so that the T-clamp sits on the wellhead seat. Observe whether the marked point on the optical cable 2 slides down. The quick-connect device connection should be secure, proving that the optical cable has been securely fixed by the T-clamp.

[0059] S2: Clamp the lower optical cable with a T-clamp and place it on the wellhead seat. Loosen the optical cable 2 to separate the male connector 9 of the quick-connect device from the female connector 10 of the quick-connect device. Lift the upper optical cable to raise the weight rod 11 and the main body of the female connector 10 of the quick-connect device to an appropriate height.

[0060] S3: Connect the retrieval cylinder 3 to the first drill string and tighten it with hydraulic clamps. Lift up to raise the first drill string and the connected retrieval cylinder 3 into a suspended state. Insert the main body of the quick-connect device into the water hole of the first drill string to be drilled. Lower the optical cable 2 until the female head 10 of the quick-connect device emerges from the lower end of the retrieval cylinder 3 and can be connected with the male head 9 of the quick-connect device.

[0061] S4: Connect the upper and lower parts of the quick connection device. The female head 10 of the quick connection device comes out from the lower end of the retrieval cylinder and can be connected with the male head 9 of the quick connection device. Lift up the optical cable 2 and remove the T-type card after it leaves the wellhead seat.

[0062] S5: Lower the fiber optic cable 2 so that the male connector 9 of the quick-connect device sits in the C-type quick-connect wellhead chuck 8. Lower the fiber optic cable 2 so that the female connector 10 of the quick-connect device disengages from the male connector 9. Install the second drill string according to steps S3-S4.

[0063] S6: Lower the retrieval cylinder 3 and the second drill string into the well. Pass the optical cable 2 through the opening of the C-type anti-drop chuck 5, and install the C-type anti-drop chuck 5 inside the water hole of the second drill string. Because there is a reduction in diameter between the drill string coupling and the drill string body, the C-type anti-drop chuck 5 can be locked in the reduced diameter position and will not fall into the drill string 4.

[0064] S7: Connect the quick-connect female connector 10 and the quick-connect male connector 9 and lift the optical cable 2. Place the C-type anti-drop chuck 5 into the water hole of the second drill string. Install the anti-drop tray 6, which has a two-part structure. Place the optical cable 2 into the optical cable center hole 21 of the anti-drop tray. Use four anti-drop tray fixing bolts 19 to assemble the anti-drop tray 6 into a whole. Place the anti-drop tray 6 into the C-type anti-drop chuck 5. Use two shear screws 17 to connect to the shear ring 18 on the C-type anti-drop chuck 5 through the shear screw mounting holes 16 on the anti-drop tray 6, and fix them into a whole. Install the anti-drop device composed of the C-type anti-drop chuck 5 and the anti-drop tray 6 into the water hole of the drill string. The drill string 4 presses the C-type anti-drop chuck 5 and is lowered into the well along with the drill string 4.

[0065] After installing the retrieval and anti-fall-off device, raise winch 15 to retrieve the fallen optical cable. Once the instrument is inside the retrieval cylinder 3, raise the optical cable 2. The upper end of the optical cable quick-connect coupling acts on the lower part of the C-type anti-fall-off chuck 5. At this point, the C-type anti-fall-off chuck 5 will not detach from the anti-fall-off tray 6 under the limit of shear screw 17. Continue raising the optical cable 2. Once the pulling force exceeds the cutting force of shear screw 17, shear screw 17 breaks. Continue raising the cable. Under the upward force of the optical cable quick-connect coupling, the anti-fall-off tray 6 moves together with the optical cable 2 within the waterhole of drill string 4 until the fallen optical cable 2 enters drill string 4.

[0066] If the fiber optic cable breaks during retrieval, the quick-connect device and the cable will only fall onto the anti-drop tray 6. The anti-drop tray 6 will continue to descend within the drill string's water hole and into the C-type anti-drop chuck 5, preventing the cable and quick-connect device from falling to the bottom of the well. At this point, simply retrieval the drill string, and the anti-drop device will capture the fallen cable and quick-connect device. This prevents the fallen cable from accumulating in the well and causing a more serious accident.

[0067] As is known from common technical knowledge, this invention can be implemented through other embodiments that do not depart from its spirit or essential characteristics. Therefore, the disclosed embodiments described above are merely illustrative in all respects and are not the only ones. All modifications within the scope of this invention or its equivalents are included in this invention.

[0068] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention and not to limit it. Although the present invention has been described in detail with reference to the above embodiments, those skilled in the art should understand that modifications or equivalent substitutions can still be made to the specific implementation of the present invention. Any modifications or equivalent substitutions that do not depart from the spirit and scope of the present invention should be covered within the scope of protection of the claims of the present invention.

Claims

1. A device for preventing optical cable from falling into a well during retrieval, characterized in that, include: Anti-drop tray (6) and C-type anti-drop chuck (5); optical cable (2) passes through C-type anti-drop chuck (5) and anti-drop tray (6); anti-drop tray (6) is set on C-type anti-drop chuck (5); It also includes a retrieval tube (3), a drill string (4), a C-type quick wellhead chuck (8), a quick connection device, a weight rod (11), and a winch (15); in use, the optical cable (2) is divided into an upper optical cable and a lower optical cable; one end of the lower optical cable is connected to the logging instrument (1), the retrieval tube (3) is fixedly connected to the drill string (4), the retrieval tube (3) and the drill string (4) are set on the outside of the lower optical cable, the C-type anti-drop chuck (5) and the anti-drop tray (6) are set inside the drill string (4); the C-type quick wellhead chuck (8) is set at the wellhead, the other end of the lower optical cable passes through the C-type quick wellhead chuck (8) and is connected to one end of the quick connection device, the other end of the quick connection device is connected to one end of the upper optical cable, the other end of the quick connection device is also connected to one end of the weight rod (11), and the other end of the upper optical cable is connected to the winch (15); The quick connection device includes a quick connection male connector (9) and a quick connection female connector (10). The quick connection male connector (9) is connected to the other end of the lower optical cable, and the quick connection female connector (10) is connected to one end of the upper optical cable. It also includes anti-drop tray fixing bolts (19). The anti-drop tray (6) has a two-part structure. The anti-drop tray fixing bolts (19) combine the two-part anti-drop tray (6) into a whole. The anti-drop tray (6) has an anti-drop tray optical cable center hole (21) in the center, and the optical cable (2) moves up and down in the anti-drop tray optical cable center hole (21); It also includes a shear screw mounting hole (16), a shear screw (17) and a shear ring (18); the shear screw (17) is connected to the shear ring (18) on the C-type anti-drop chuck (5) through the shear screw mounting hole (16) on the anti-drop tray (6); Pass the optical cable (2) through the opening of the C-type anti-drop chuck (5) and install the C-type anti-drop chuck (5) inside the drill bit.

2. The optical cable core-through retrieval and well-prevention device according to claim 1, characterized in that, The center hole (21) of the anti-drop tray optical cable is also designed with multiple anti-drop tray water holes (20) around it for drilling fluid to pass through.

3. The optical cable core-through retrieval and well-prevention device according to claim 1, characterized in that, It also includes a casing (7), which is fixed inside the wellhead.

4. The optical cable core-through retrieval and well-prevention device according to claim 1, characterized in that, It also includes a top pulley (12), a tension meter (13) and a bottom pulley (14); the other end of the upper optical cable is connected to the top pulley (12) and the bottom pulley (14) in sequence, and the tension meter (13) is connected to the top pulley (12).

5. The optical cable core-through retrieval and well-prevention device according to claim 1, characterized in that, The drilling tool (4) includes a first drill string and a second drill string. One end of the first drill string is fixedly connected to the retrieval tube (3), and one end of the second drill string is connected to the other end of the first drill string. The other end of the second drill string is connected to the C-type fast wellhead chuck (8). Both the first drill string and the second drill string are equipped with water holes.

6. The optical cable core-through retrieval and well-prevention device according to claim 1, characterized in that, The quick-connect device female connector (10) is provided with a quick-connect female connector (26) and a monk head mounting groove (27). The quick-connect device male connector (9) is provided with a quick-connect male connector (28) and a quick-connect male monk head (29). The upper optical cable is riveted to the quick-connect device female connector (10), and the lower optical cable is riveted to the quick-connect device male connector (9). The quick-connect female connector (26) is connected to the quick-connect male connector (28), and the quick-connect male monk head (29) is connected to the monk head mounting groove (27).

7. The optical cable core-through retrieval and well-prevention device according to claim 1, characterized in that, Both the male connector (9) and the female connector (10) of the quick-connect device are provided with an optical cable fixing cap (22), an optical cable outer armor first cone sleeve (23), an optical cable outer armor second cone sleeve (24), and an optical cable outer armor third cone sleeve (25); the optical cable fixing cap (22) is located outside the optical cable outer armor first cone sleeve (23), the optical cable outer armor first cone sleeve (23) is located outside the optical cable outer armor second cone sleeve (24), and the optical cable outer armor second cone sleeve (24) is located outside the optical cable outer armor third cone sleeve (25); the optical cable (2) passes through and is installed inside the optical cable fixing cap (22), the optical cable outer armor first cone sleeve (23), the optical cable outer armor second cone sleeve (24), and the optical cable outer armor third cone sleeve (25).

8. A method for using a fiber optic cable core-through retrieval and well-prevention device, characterized in that, A fiber optic cable core-piercing retrieval and well-prevention device according to any one of claims 1-7, comprising: S1: Conduct a tensile test on the optical cable (2); S2: Clamp the lower optical cable with a T-clamp and place it on the wellhead seat. Loosen the optical cable (2) to separate the male connector (9) and the female connector (10) of the quick connector. Lift the upper optical cable to raise the weight rod (11) and the main body of the female connector (10) of the quick connector to an appropriate height. S3: Connect the retrieval tube (3) and the drill string (4), lift up to raise the drill string (4) and the connected retrieval tube (3) into a suspended state; put the quick connection device into the drill string (4) to be drilled; lower the optical cable (2) until the female head (10) of the quick connection device comes out from the lower end of the retrieval tube (3) and can be connected with the male head (9) of the quick connection device; S4: Connect the upper and lower parts of the quick connection device, lift the optical cable (2), and remove the T-type card after the T-type card leaves the wellhead seat. S5: Lower the optical cable (2) so that the male connector (9) of the quick connector sits in the C-type quick wellhead chuck (8); Lower the optical cable (2) so that the female connector (10) of the quick connector is disconnected from the male connector (9) of the quick connector; S6: Lower the retrieval cylinder (3) and drill string (4) into the well; pass the optical cable (2) through the opening of the C-type anti-drop chuck (5) and install the C-type anti-drop chuck (5) inside the drill string; S7: Connect the female connector (10) and male connector (9) of the quick-connect device and lift the optical cable (2); place the C-type anti-drop chuck (5) inside the drill string (4); install the anti-drop tray (6), place the optical cable (2) inside the anti-drop tray (6), place the anti-drop tray (6) inside the C-type anti-drop chuck (5); install the anti-drop device composed of the C-type anti-drop chuck (5) and the anti-drop tray (6) inside the drill string (4), press the C-type anti-drop chuck (5) into the well along with the drill string (4); After the retrieval and anti-fall-off device is installed, the winch (15) is raised to carry out the retrieval operation of the fallen optical cable. After ensuring that the instrument has entered the retrieval cylinder (3), the optical cable (2) is raised. The anti-fall-off tray (6) moves together with the optical cable (2) in the drill string (4) under the action of upward force until the fallen optical cable (2) enters the drill string (4).

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