Device and method for hanging cable in drilling tool water hole during overflow
By designing a cable suspension device with a suspension section and a self-locking structure, the problem of the cable not being able to be quickly suspended when the drill bit is stuck and overflows is solved, realizing safe suspension and easy installation of the cable, and reducing subsequent salvage costs and risks.
Patent Information
- Application Number
- CN202411093376.1
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- Filing Date
- 2024-08-09
- Publication Date
- 2026-02-10
AI Technical Summary
During drilling, when the drill string gets stuck and overflow occurs, current technology lacks a device that can quickly suspend the cable and prevent it from falling into the well, resulting in high subsequent retrieval costs and risks.
Design a device comprising a suspension section, a deformable conical inner cylinder, and a rigid outer cylinder. The device suspends the cable during overflow through a self-locking structure and uses the cable's gravity and friction to fix the cable in place, ensuring that the cable does not fall into the well.
This achieves reliable cable suspension, avoids the secondary danger of cable shearing under huge tension, simplifies installation operations, and does not affect the well shut-in process of the plug valve.
Smart Images
Figure CN121497231A_ABST
Abstract
Description
TECHNICAL FIELD
[0001] The present application belongs to the technical field of oil and gas exploration and development, and relates to a device and method for suspending a cable in a water eye of a drilling tool when overflow occurs. BACKGROUND
[0002] In the process of oil exploration and development, due to various reasons (such as complex formation structure, poor drilling fluid performance, improper operation, etc.), the drilling tool is trapped in the well and cannot move freely, that is, the drilling tool is stuck. Through drilling fluid circulation, drilling tool movement test and other means, it is confirmed that the drilling tool is indeed stuck and cannot be released by conventional methods (such as moving the drilling tool up and down, using a jar, etc.). If a drilling tool sticking accident occurs, and an explosive unhooking is needed, a cable and instrument for measuring the sticking point and explosive unhooking operation often need to be lowered into the well without pressure from the water eye of the drilling tool. Under this operation condition without pressure, due to the fact that the drilling tool cannot move downhole and the cable exists in the water eye of the drilling tool, the plug valve connected to the drilling tool cannot be closed. If overflow occurs downhole, the annulus in the drilling tool is in a state of unable to shut in and the water eye is out of control. After overflow, the cable must be cut to perform subsequent well control operations. When the cable is cut, there is no matching cable suspension device after the cable is cut, and the cable and instrument will fall into the well.
[0003] When operating in a very deep well, the risk of wellbore overflow is higher than in other places. At the same time, the probability of overflow during cable operation in the water eye of the drilling tool in the case of sticking is very high, and the operation of cutting the cable is also more frequent. Once the cable is cut, due to the large well depth and complex downhole conditions, the subsequent salvage manpower, material resources and time cost is extremely high. At present, there are few devices in the field that can quickly suspend the cable after cutting to ensure that the cable does not fall into the well. SUMMARY
[0004] The purpose of the present application is to solve the technical problem of the lack of a device that can quickly suspend the cable after cutting to ensure that the cable does not fall into the well in the prior art, and to provide a device and method for suspending a cable in a water eye of a drilling tool when overflow occurs.
[0005] In order to achieve the above purpose, the present application adopts the following technical solutions:
[0006] In a first aspect, the present invention provides a device for suspending a cable inside a drill bit's water hole during overflow, comprising a suspension section with a female and a male threaded connection at both ends, the female threaded connection being used to connect to a plug valve, and the male threaded connection being used to connect to a drill pipe; a rigid outer cylinder is fitted inside the suspension section, and a step is provided at the lower end of the inner wall of the suspension section to prevent the rigid outer cylinder from falling; a deformable conical inner cylinder is fitted inside the rigid outer cylinder, and the inner wall structure of the rigid outer cylinder is an inverted conical structure that mates with the outer wall of the deformable conical inner cylinder; a rigid outer cylinder opening is provided on the rigid outer cylinder; a deformable conical inner cylinder opening is provided on the deformable conical inner cylinder; the maximum outer diameter of the deformable conical inner cylinder is greater than the minimum inner diameter of the rigid outer cylinder; and the inner diameter of the deformable conical inner cylinder in its undeformed state is in clearance fit with the cable.
[0007] A further improvement of the present invention is as follows:
[0008] The inner wall surface of the deformable conical inner cylinder is roughened to provide friction for the cable.
[0009] The rough surface is a barbed rough surface.
[0010] The opening width of the deformable conical inner cylinder is greater than the diameter of the cable, and the opening angle of the deformable conical inner cylinder is less than 90°.
[0011] The opening width of the rigid outer cylinder is greater than the diameter of the cable, and the opening angle of the rigid outer cylinder is less than 90°.
[0012] The rigid outer cylinder has several through-holes arranged axially on its wall surface.
[0013] The through-holes are evenly distributed circumferentially on the wall surface of the rigid outer cylinder.
[0014] The male thread is connected to the drill pipe by a thread; the female thread is connected to the plug valve by a thread.
[0015] The step is a discontinuous raised step located on the lower end of the inner wall of the suspension section.
[0016] Secondly, the present invention provides a method for suspending a cable inside the drill string's water hole when an overflow occurs based on the above-mentioned device, comprising the following steps:
[0017] Step 1: Before logging operations, install the suspension sub between the plug valve and the drill pipe, and test the seal.
[0018] Step 2: In the event of an overflow, stop cable work and use a jack to hold the drill pipe at the wellhead; disconnect the suspension sub from the plug valve and lift the plug valve until the cable is exposed;
[0019] Step 3: The cable enters the deformable conical inner cylinder through the opening of the deformable conical inner cylinder, and then the deformable conical inner cylinder is embedded into the rigid outer cylinder.
[0020] Step 4: Gently lower the cable winch, which carries the assembled deformable conical inner cylinder and rigid outer cylinder together with the cable, into the well shaft and down to the step where the suspension section is located.
[0021] Step 5: Continue lowering the cable. The deformable conical inner cylinder continues to descend slightly, allowing it to fully deform within the rigid outer cylinder. This generates friction to prevent the cable from descending further, thus securing the cable. Continue lowering the cable until the upper part of the suspension section is completely slack, confirming that the lower part of the cable is suspended and secured.
[0022] Step 6: Cut the cable along the female thread end face of the upper part of the suspension sub, connect the plug valve to the suspension sub, pull the cable out from the upper part of the tubing string, close the plug valve to achieve well shut-in inside the drill string water hole, and then perform well shut-in according to the normal procedure.
[0023] Compared with the prior art, the present invention has the following beneficial effects:
[0024] This invention discloses a device for suspending a cable inside the drill bit's water hole during overflow. When suspension is required, the cable is disassembled from the connection between the suspension sub and the plug at the top of the drill bit on the drill platform and raised a certain distance to expose the cable inside the drill bit's water hole. The cable, deformable conical inner cylinder, and rigid outer cylinder are assembled in sequence. The winch is gently lowered, and the cable carries the assembled deformable conical inner cylinder and rigid outer cylinder into the suspension sub. When lowered to the suspension sub, the rigid outer cylinder is restricted from descending due to the presence of its internal suspension steps. The cable continues to be lowered. At this point, due to gravity and the friction between the cable and the deformable conical inner cylinder, the cable continues to descend slightly along with the deformable conical inner cylinder. Consequently, the rigid outer cylinder forces the deformable conical inner cylinder to compress and deform. The deformation of the deformable conical inner cylinder increases the friction between it and the cable. At the same time, because the maximum outer diameter of the deformable conical inner cylinder is larger than the minimum inner diameter of the rigid outer cylinder, it is impossible for the cable to pass through the rigid outer cylinder. Thus, the cable is suspended and fixed. This self-locking structure is activated by the weight of the cable; the greater the weight, the more firmly the cable is fixed. This invention employs a self-locking structure to ensure reliable cable suspension. It features a simple structure, rapid installation, and easy operation, and does not conflict with other drilling tools or operational procedures, demonstrating strong methodological independence. Installed below the plug valve, cutting the cable does not affect the plug valve's shut-in function. It allows for reliable suspension of the cable and instruments before releasing the cable and then cutting it, ensuring safe cable suspension and preventing secondary hazards caused by cutting the cable under immense tension. Attached Figure Description
[0025] To more clearly illustrate the technical solutions of the embodiments of the present invention, the accompanying drawings used in the embodiments will be briefly introduced below. It should be understood that the following drawings only show some embodiments of the present invention and should not be regarded as a limitation on the scope. For those skilled in the art, other related drawings can be obtained based on these drawings without creative effort.
[0026] Figure 1 This is a schematic diagram of the overall structure of a device for suspending a cable inside the drill bit's water hole when overflow occurs, according to the present invention.
[0027] Figure 2 This is a cross-sectional view of the suspension section in a device for suspending a cable inside the drill bit's water hole when an overflow occurs, according to the present invention.
[0028] Figure 3 This is a schematic diagram of the deformable conical inner cylinder in a device for suspending a cable inside the drill bit's water hole when overflow occurs, according to the present invention.
[0029] Figure 4 This is a schematic diagram of the inner wall of the deformable conical inner cylinder in a device for suspending a cable inside the drill bit's water hole when overflow occurs, according to the present invention.
[0030] Figure 5 This is a schematic diagram of the rigid outer cylinder structure in a device for suspending a cable inside the drill bit's water hole when overflow occurs, according to the present invention.
[0031] Figure 6 This is a schematic diagram of the assembly of the cable, deformable conical inner cylinder, and rigid outer cylinder in a device for suspending a cable inside the drill bit's water hole when overflow occurs, according to the present invention.
[0032] Figure 7 This is a schematic diagram of the on-site construction and assembly of a device for suspending a cable inside the drill bit's water hole when an overflow occurs, according to the present invention.
[0033] Wherein: 1-Suspension section; 2-Cable; 3-Deformable conical inner cylinder; 4-Through port; 5-Rigid outer cylinder; 6-Female thread; 7-Male thread; 8-Rigid outer cylinder opening; 9-Deformable conical inner cylinder opening; 10-Step; 11-Rough inner wall with barbs; 12-Plug valve; 13-Cable suspension device; 14-Drill rod. Detailed Implementation
[0034] To make the objectives, technical solutions, and advantages of the embodiments of the present invention clearer, the technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. The components of the embodiments of the present invention described and shown in the accompanying drawings can generally be arranged and designed in various different configurations.
[0035] Therefore, the following detailed description of the embodiments of the invention provided in the accompanying drawings is not intended to limit the scope of the claimed invention, but merely to illustrate selected embodiments of the invention. All other embodiments obtained by those skilled in the art based on the embodiments of the invention without inventive effort are within the scope of protection of the invention.
[0036] It should be noted that similar labels and letters in the following figures indicate similar items. Therefore, once an item is defined in one figure, it does not need to be further defined and explained in subsequent figures.
[0037] In the description of the embodiments of the present invention, it should be noted that if terms such as "upper," "lower," "horizontal," or "inner" indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, or the orientation or positional relationship commonly used when the product of the invention is in use, they are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of the present invention. Furthermore, terms such as "first" and "second" are only used to distinguish descriptions and should not be construed as indicating or implying relative importance.
[0038] Furthermore, the use of the term "horizontal" does not imply that the component must be absolutely horizontal, but rather that it can be slightly tilted. For example, "horizontal" simply means that its direction is more horizontal than "vertical," and does not mean that the structure must be completely horizontal, but can be slightly tilted.
[0039] In the description of the embodiments of the present invention, it should also be noted that, unless otherwise explicitly specified and limited, the terms "set," "install," "connect," and "link" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in the present invention according to the specific circumstances.
[0040] The present invention will now be described in further detail with reference to the accompanying drawings:
[0041] Example 1
[0042] See Figure 1 , Figure 6 and Figure 7This invention discloses a device for suspending a cable inside a drill bit's water hole during overflow, comprising a suspension section 1 with a female connector 6 and a male connector 7 at both ends. The female connector 6 is used to connect to a plug valve 12, and the male connector 7 is used to connect to a drill pipe 14. A rigid outer cylinder 5 is fitted inside the suspension section 1, and a step 10 is provided at the lower end of the inner wall of the suspension section 1 to prevent the rigid outer cylinder 5 from falling. The step 10 is a discontinuous raised step on the lower end of the inner wall of the suspension section 1. A deformable conical inner cylinder 3 is fitted inside the rigid outer cylinder 5. The inner wall structure of the rigid outer cylinder 5 is an inverted conical structure that matches the outer wall of the deformable conical inner cylinder 3. The maximum outer diameter of the deformable conical inner cylinder 3 is greater than the minimum inner diameter of the rigid outer cylinder 5. The inner diameter of the deformable conical inner cylinder 3 in its undeformed state is in clearance fit with the cable 2. Figure 3 As shown, the deformable conical inner cylinder 3 is provided with a deformable conical inner cylinder opening 9. The opening width of the deformable conical inner cylinder opening 9 is slightly larger than the diameter of the cable 2, and the opening angle is 45°. Figure 5 As shown, the rigid outer cylinder 5 has a rigid outer cylinder opening 8, and the opening width of the deformable conical inner cylinder opening 9 is slightly larger than the diameter of the cable 2, with an opening angle of 45°. Several through-holes 4 are axially arranged on the wall surface of the rigid outer cylinder 5. The through-holes 4 are evenly distributed circumferentially on the wall surface of the rigid outer cylinder 5. The inner wall surface of the deformable conical inner cylinder 3 is roughened to provide friction for the cable 2.
[0043] Example 2
[0044] See Figure 2 and Figure 4 This invention discloses a device for suspending a cable inside a drill bit's water hole during overflow, comprising a suspension section 1 with a female threaded connection 6 and a male threaded connection 7 at each end. The female threaded connection 6 is used to connect to a stopcock valve 12, and the male threaded connection 7 is used to connect to a drill pipe 14. The male threaded connection 7 is threaded to the drill pipe 14, and the female threaded connection 6 is threaded to the stopcock valve 12. A rigid outer cylinder 5 is fitted inside the suspension section 1. A step 10 is provided at the lower end of the inner wall of the suspension section 1 to prevent the rigid outer cylinder 5 from falling. The step 10 is a discontinuous raised step on the lower end of the inner wall of the suspension section 1. A deformable conical inner cylinder 3 is fitted inside the rigid outer cylinder 5. The inner wall structure of the rigid outer cylinder 5 is an inverted conical structure that matches the outer wall of the deformable conical inner cylinder 3. The maximum outer diameter of the deformable conical inner cylinder 3 is greater than the minimum inner diameter of the rigid outer cylinder 5. The inner diameter of the deformable conical inner cylinder 3 in its undeformed state is in clearance fit with the cable 2. Figure 3 As shown, the deformable conical inner cylinder 3 is provided with a deformable conical inner cylinder opening 9. The opening width of the deformable conical inner cylinder opening 9 is greater than the diameter of the cable 2, and the opening angle is 60°. Figure 5As shown, the rigid outer cylinder 5 has a rigid outer cylinder opening 8, and the opening width of the deformable conical inner cylinder opening 9 is greater than the diameter of the cable 2, with an opening angle of 60°. Several through-holes 4 are axially arranged on the wall surface of the rigid outer cylinder 5. The through-holes 4 are evenly distributed circumferentially on the wall surface of the rigid outer cylinder 5. The inner wall surface of the deformable conical inner cylinder 3 is roughened to provide friction for the cable 2. The roughened surface is a barbed roughened surface.
[0045] Embodiments 1 and 2 of this invention disclose a device for suspending a cable inside the drill bit's water hole when overflow occurs. When suspension operations are required, the cable is lifted a certain distance from the connection between the upper part of the suspension sub and the plug on the drill platform, exposing the cable inside the drill bit's water hole. The cable, deformable conical inner cylinder, and rigid outer cylinder are assembled in sequence. The winch is gently lowered, and the cable carries the assembled deformable conical inner cylinder and rigid outer cylinder into the suspension sub. When lowered to the suspension sub, the rigid outer cylinder is restricted from descending due to the presence of its internal suspension steps. The cable continues to be lowered. At this time, due to gravity and the friction between the cable and the deformable conical inner cylinder, the cable continues to descend slightly with the deformable conical inner cylinder. Consequently, the rigid outer cylinder forces the deformable conical inner cylinder to undergo compression deformation. The deformation of the deformable conical inner cylinder increases the friction between it and the cable. At the same time, because the maximum outer diameter of the deformable conical inner cylinder is larger than the minimum inner diameter of the rigid outer cylinder, it is impossible for the cable to pass through the rigid outer cylinder. The cable is thus suspended and fixed. This self-locking structure is activated by the cable's gravity; the greater the gravity, the more securely the cable is fixed. This invention utilizes a self-locking structure to achieve reliable cable suspension. It is simple in structure, quick to install, and easy to operate, and does not conflict with other drilling tools or operational procedures, demonstrating strong methodological independence. Installed below the plug valve, cutting the cable does not affect the plug valve's shut-in function. It allows for reliable suspension of the cable and instruments before releasing the cable and then cutting it, ensuring safe cable suspension and preventing secondary accidents caused by cutting the cable under high tension. Furthermore, several through-holes are axially arranged on the rigid outer cylinder wall, preventing blockage of the working tubing's water holes after the cut cable and instruments are suspended, thus meeting the needs of subsequent well control operations.
[0046] This invention also discloses a method for suspending a cable inside the drill string's water hole when overflow occurs based on the above-mentioned device, comprising the following steps:
[0047] Step 1: Before logging operations, install the suspension sub 1 between the plug valve 12 and the drill pipe 14, and test the sealing performance;
[0048] Step 2: When an overflow occurs, stop the cable operation and use a hoist to sit the drill pipe 14 at the wellhead; disconnect the suspension sub 1 from the plug valve 12 and lift the plug valve 12 until the cable 2 is exposed;
[0049] Step 3: Cable 2 enters the deformable conical inner cylinder 3 through the opening 9 of the deformable conical inner cylinder, and then the deformable conical inner cylinder 3 is embedded into the rigid outer cylinder 5;
[0050] Step 4: Gently lower the cable winch into the well shaft, carrying the assembled deformable conical inner cylinder 3 and rigid outer cylinder 5 together with the cable 2, and lower it to the step 10 of the suspension section 1.
[0051] Step 5: Continue lowering cable 2. The deformable conical inner cylinder 3 continues to descend slightly, allowing it to fully deform within the rigid outer cylinder 5. This generates friction, preventing cable 2 from descending further and securing it. Continue lowering cable 2 until the upper portion of the suspension section 1 is completely slack, confirming that the lower part of cable 2 is suspended and secured. The self-locking structure utilizes the cable's own weight to achieve rapid and reliable suspension and fixation of the cable and instrument. The operation is simple, installation is quick, and no additional tools are required on-site, making it ideal for emergency cable suspension. The cable is cut only after the upper portion of the suspension section has slacked, avoiding secondary hazards caused by cutting the cable under tension. This invention makes cable cutting safer.
[0052] Step Six: Before cutting the cable, confirm that the cable is securely suspended to prevent it from slipping and causing impact injury to the tubing and personnel. Cut the cable 2 along the end face of the female thread 6 on the upper part of the suspension sub 1, connect the stop valve 12 to the suspension sub 1, pull the cable 2 out from the upper part of the tubing, close the stop valve 12 to shut in the well inside the drill string, and then perform the shut-in procedure as normal.
[0053] This invention discloses a method for suspending a cable inside the drill string's water hole during overflow. When suspension is required, the cable is disassembled from the connection between the suspension sub and the plug at the top of the drill rig on the drill platform and raised a certain distance to expose the cable inside the drill string's water hole. The cable, deformable conical inner cylinder, and rigid outer cylinder are assembled in sequence. The winch is gently lowered, and the cable carries the assembled deformable conical inner cylinder and rigid outer cylinder into the suspension sub. When the cable reaches the suspension sub, the rigid outer cylinder is restricted from descending due to the presence of its internal suspension steps. The cable continues to be lowered. At this point, due to gravity and the friction between the cable and the deformable conical inner cylinder, the cable continues to descend slightly along with the deformable conical inner cylinder. Consequently, the rigid outer cylinder forces the deformable conical inner cylinder to compress and deform. The deformation of the deformable conical inner cylinder increases the friction between it and the cable. Simultaneously, because the maximum outer diameter of the deformable conical inner cylinder is larger than the minimum inner diameter of the rigid outer cylinder, it is impossible for the cable to pass through the rigid outer cylinder. Thus, the cable is suspended and fixed. This self-locking structure is activated by the weight of the cable; the greater the weight, the more securely the cable is fixed. This invention employs a self-locking structure to ensure reliable cable suspension. It features a simple structure, rapid installation, and easy operation, and does not conflict with other drilling tools or procedures, demonstrating strong methodological independence. Installed below the plug valve, cutting the cable does not affect the plug valve's shut-in function. It allows for reliable suspension of the cable and instruments before cable release and subsequent cutting, ensuring safe cable suspension and preventing secondary accidents caused by cable cutting under high tension. Furthermore, several through-holes are axially arranged on the rigid outer cylinder wall, preventing blockage of the working tubing's water holes after the cut cable and instruments are suspended, thus meeting the needs of subsequent well control operations.
[0054] The working principle of this invention is as follows:
[0055] The main body of the suspension sub is pre-installed on the drill string on the drill table during cable operation inside the drill string's water hole. The upper part is connected to the plug valve and other drill string, top drive or water tap, etc. The cable and instruments can pass through the drill string's water hole normally.
[0056] The deformable conical inner cylinder 3 has an overall conical structure that is thicker at the top and thinner at the bottom. The conical structure has a cylindrical hole in the middle with a diameter approximately equal to the outer diameter of the cable. The inner wall of the cylindrical hole has a barbed rough surface 11 to generate friction and hold the cable tightly. The opening 9 is the channel for inserting the cable.
[0057] The rigid outer cylinder 5 consists of a cable inlet 8 and a through-hole 4, which allows for the smooth flow of drilling fluid. The rigid outer cylinder 5 has an internal structure that is wider at the top and narrower at the bottom, which works in conjunction with the deformable conical inner cylinder 3. During use, the assembly sequence is as follows: the deformable conical inner cylinder 3 wraps around the cable, and the deformable conical inner cylinder 3, along with the cable, is embedded into the rigid outer cylinder 5. A certain pre-tightening force is applied to generate friction between the rigid outer cylinder 5 and the deformable conical inner cylinder 3, as well as between the deformable conical inner cylinder 3 and the cable. The deformable conical inner cylinder 3 and the rigid outer cylinder 5 achieve a self-locking function under the weight of the cable.
[0058] The self-locking function of this structure works as follows: When suspension operations are required, the cable is disassembled from the connection between the upper part of the suspension sub and the plug on the drilling platform and raised a certain distance to expose the cable inside the drill string's water hole. The cable, deformable conical inner cylinder 3, and rigid outer cylinder 5 are then assembled in sequence. The winch is gently lowered, and the cable carries the assembled deformable conical inner cylinder 3 and rigid outer cylinder 5 into the suspension sub. When the cable reaches the suspension sub 1, the rigid outer cylinder 5 is restricted from descending due to the presence of the internal suspension step 10. The cable continues to be lowered. At this point, due to gravity and the friction between the cable and the deformable conical inner cylinder 3, the cable continues to descend slightly in conjunction with the deformable conical inner cylinder. Consequently, the rigid outer cylinder 5 forces the deformable conical inner cylinder 3 to undergo compression deformation. The deformation of the deformable conical inner cylinder 3 increases the friction between it and the cable. Simultaneously, because the maximum outer diameter of the deformable conical inner cylinder 3 is greater than the minimum inner diameter of the rigid outer cylinder 5, it is impossible for the cable to pass through the rigid outer cylinder 5. The cable is thus suspended and fixed. This self-locking structure is activated by the weight of the cable; the greater the weight, the more firmly the cable is fixed.
[0059] The above are merely preferred embodiments of the present invention and are not intended to limit the present invention. Various modifications and variations can be made to the present invention by those skilled in the art. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the scope of protection of the present invention.
Claims
1. A device for suspending a cable inside the drill bit's water hole when overflow occurs, characterized in that, The suspension section (1) includes a female threaded joint (6) and a male threaded joint (7) at both ends. The female threaded joint (6) is used to connect to a plug valve (12), and the male threaded joint (7) is used to connect to a drill pipe (14). A rigid outer cylinder (5) is fitted inside the suspension section (1), and a step (10) is provided at the lower end of the inner wall of the suspension section (1) to prevent the rigid outer cylinder (5) from falling. A deformable conical inner cylinder (3) is fitted inside the rigid outer cylinder (5). The inner wall structure of the rigid outer cylinder (5) is an inverted conical structure that matches the outer wall of the deformable conical inner cylinder (3); the rigid outer cylinder (5) is provided with a rigid outer cylinder opening (8); the deformable conical inner cylinder (3) is provided with a deformable conical inner cylinder opening (9); the maximum outer diameter of the deformable conical inner cylinder (3) is greater than the minimum inner diameter of the rigid outer cylinder (5); the inner diameter of the deformable conical inner cylinder (3) in the undeformed state is in clearance fit with the cable (2).
2. The device for suspending a cable inside the drill bit's water hole when overflow occurs, as described in claim 1, is characterized in that... The inner wall surface of the deformable conical inner cylinder (3) is set as a rough surface to provide friction for the cable (2).
3. The device for suspending a cable inside the drill bit's water hole when overflow occurs, as described in claim 2, is characterized in that... The rough surface is a barbed rough surface.
4. The device for suspending a cable inside the drill bit's water hole when overflow occurs, as described in claim 1, is characterized in that... The opening width of the deformable conical inner cylinder opening (9) is greater than the diameter of the cable (2), and the opening angle of the deformable conical inner cylinder opening (9) is less than 90°.
5. The device for suspending a cable inside the drill bit's water hole when overflow occurs, as described in claim 4, is characterized in that... The opening width of the rigid outer cylinder opening (8) is greater than the diameter of the cable (2), and the opening angle of the rigid outer cylinder opening (8) is less than 90°.
6. The device for suspending a cable inside the drill bit's water hole when overflow occurs, as described in claim 1, is characterized in that... The rigid outer cylinder (5) has several through holes (4) arranged axially on its wall surface.
7. The device for suspending a cable inside the drill bit's water hole when overflow occurs, as described in claim 6, is characterized in that... The through-holes (4) are evenly distributed around the wall of the rigid outer cylinder (5).
8. The device for suspending a cable inside the drill bit's water hole when overflow occurs, as described in claim 1, is characterized in that... The male thread (7) is threaded to the drill rod (14); the female thread (6) is threaded to the plug valve (12).
9. The device for suspending a cable inside the drill bit's water hole when overflow occurs, as described in claim 1, is characterized in that... The step (10) is a discontinuous raised step located on the lower end of the inner wall of the suspension section (1).
10. A method for suspending a cable inside the drill string's water hole when an overflow occurs, based on the device according to any one of claims 1-9, characterized in that, Includes the following steps: Step 1: Before logging operations, install the suspension sub (1) between the plug valve (12) and the drill pipe (14) and test the sealing performance; Step 2: When an overflow occurs, stop the cable operation and use a hoist to sit the drill pipe (14) at the wellhead; remove the suspension sub (1) and the plug valve (12), and lift the plug valve (12) until the cable (2) is exposed; Step 3: The cable (2) enters the deformable conical inner cylinder (3) through the opening (9) of the deformable conical inner cylinder, and then the deformable conical inner cylinder (3) is embedded into the rigid outer cylinder (5); Step 4: Gently lower the cable winch into the well shaft along with the assembled deformable conical inner cylinder (3) and rigid outer cylinder (5) carried by the cable (2), and lower it to the step (10) of the suspension section (1); Step 5: Continue lowering the cable (2). The deformable conical inner cylinder (3) continues to descend slightly, causing the deformable conical inner cylinder (3) to deform sufficiently in the rigid outer cylinder (5), generating friction to prevent the cable (2) from continuing to descend, thus fixing the cable (2). Continue lowering the cable (2) until the upper part of the cable (2) above the suspension section (1) is completely relaxed, confirming that the lower part of the cable (2) is suspended and fixed. Step 6: Cut the cable (2) along the end face of the female buckle (6) on the upper part of the suspension sub (1), connect the plug valve (12) to the suspension sub (1), pull out the cable (2) from the upper part of the tubing string, close the plug valve (12) to achieve well shut-in inside the drill string water hole, and then perform well shut-in according to the normal procedure.