An inner fishing buckle device with a guiding sleeve-in function

Abstract

This utility model provides an internal retrieval and snap-fit ​​device with a guiding insertion function. The device comprises an upper body and a lower body. The upper body includes an upper section, a middle section, and a lower section from top to bottom, with a flow channel along its central axis. The outer diameter of the middle section is larger than that of the upper section, and a third hard alloy is present at the chamfer between the upper and middle sections. The lower section is a snap-fit ​​component, shaped like a frustum, with its diameter gradually decreasing towards the lower body. The snap-fit ​​component has snap-fit ​​threads, and a first hard alloy is present at its lower part. The lower body includes a lower body shell and a spiral guide shoe from top to bottom. The outer diameter of the spiral guide shoe is larger than that of the lower body shell, and a second hard alloy is present at the chamfer between the lower body shell and the spiral guide shoe. The lower body shell is connected to the middle section of the upper body, and the snap-fit ​​component is located within the lower body shell. The advantage of this utility model is that it effectively ensures the safety and efficiency of retrieving drill string debris from large-diameter wells.

Description

Technical Field

[0001] This utility model relates to the field of oil and gas drilling technology, specifically to an internal retrieval and buckling device with a guiding insertion function. Background Technology

[0002] In oil and gas exploration, deep and ultra-deep wells are becoming increasingly common, leading to longer wellbore structures with larger upper diameters. Due to the loose, poorly cemented, and highly permeable lithology of certain well sections, the wellbore walls are prone to instability and collapse, resulting in irregular wellbores and enlarged diameters. In such wellbores, drill string breakage occurs, requiring the removal of all fallen drill string components. However, existing fishing tools have many problems: 1. Due to the large annular gap between the fish head and the large-sized wellbore, and the fish not being centered, the existing internal fishing tools have a large annular gap with the wellbore. Although the position of the fish head can be detected occasionally, it is difficult to effectively insert the fishing tool into the fish, resulting in the fishing tool being lowered too deep and passing over the fish head; 2. Prolonged pump operation and rotation fishing will cause the well wall to be eroded and scraped, further enlarging the wellbore size at the top of the fish, and even causing the fish head to be pushed to the side or squeezed into the well wall, causing well wall collapse, blockage, or sand to bury the fish, resulting in stuck drill bit; 3. Existing internal fishing tools lack the function of reverse reaming. When reverse reaming is required after catching the fish, the threaded area becomes the main stress point, repeatedly bearing torque, tension, and pressure. This can cause the fish to slip out or even break the threaded area, further increasing the difficulty of troubleshooting.

[0003] Existing fishing tools have shortcomings in handling fish that have fallen into the well section. They increase the number of tripping operations and the time the fish remains stationary, making it easy to miss the optimal fishing opportunity, increasing the difficulty of handling, and even leading to failure, resulting in well filling and sidetracking, and ultimately causing wellbore abandonment. Therefore, it is of great significance to provide an internal fishing and hook-making device with a guiding insertion function.

[0004] Chinese patent application number "CN201911183108.8" entitled "A Strong-Grab Fish Retrieval Tube" discloses a strong-grab fish retrieval tube, which includes an upper connector, a tube body, and a guide shoe. The upper inner side of the upper connector has a stepped connector buckle formed therein. The lower end of the upper connector is threaded to the tube body, and the lower end of the tube body is threaded to the guide shoe. A conical inner hole is formed inside the tube body. An A-shaped packing is fixed to the top of the upper connector, and a [missing information - likely a device or component] is disposed within the A-shaped packing. A fine-tuning spring is provided at its lower end with a slip limiting seat. A retrieval slip is threadedly fixed below the slip limiting seat. During retrieval, the fish comes into contact with the retrieval slip, resulting in an elastic collision. As the fine-tuning spring gradually compresses, it provides a downward axial force to assist the axial force provided by the anchor rod, pushing the retrieval slip to engage with the fish and complete the retrieval. This avoids rigid collisions between the slip and the fish, and the spring force makes it easier for the slip to engage with the fish, improving work efficiency. However, this retrieval cylinder differs from the tool used in this application. Utility Model Content

[0005] In view of the shortcomings of the existing technology, the purpose of this utility model is to solve one or more problems existing in the above-mentioned existing technology. For example, one of the purposes of this utility model is to provide an internal fishing and hook-making device with a guiding and hooking function that can guide the fish into the device and effectively and smoothly hook the fish into large-size wellbores.

[0006] To achieve the above objectives, this utility model provides an internal hook-making device with a guiding insertion function. The device may include an upper body and a lower body. The upper body includes an upper section, a middle section, and a lower section arranged sequentially from top to bottom, and a flow channel is provided along the central axis of the upper body. The outer diameter of the middle section is larger than that of the upper section, and a third hard alloy is inlaid at the chamfer between the upper and middle sections. The lower section is a hook-making component, which is truncated cone-shaped. The diameter of the hook-making component gradually decreases as it approaches the lower body. The circumferential side of the hook-making component is provided with hook-making threads, and a first hard alloy is inlaid at the lower part of the hook-making component. The lower body includes a lower body shell and a spiral guide shoe arranged sequentially from top to bottom. The outer diameter of the spiral guide shoe is larger than that of the lower body shell, and a second hard alloy is inlaid at the chamfer between the lower body shell and the spiral guide shoe. The lower body shell is connected to the middle section of the upper body, and the hook-making component is located in the lower body shell.

[0007] In one or more exemplary embodiments of one aspect of this utility model, the lower main body housing may be threadedly connected to the upper main body.

[0008] In one or more exemplary embodiments of one aspect of this utility model, the upper part of the lower main body shell may be provided with a trapezoidal female thread, and the middle section of the upper main body may be provided with a trapezoidal male thread, wherein the trapezoidal female thread and the trapezoidal male thread are engaged.

[0009] In one or more exemplary embodiments of one aspect of this utility model, the outer diameter of the lower main body shell may be the same as that of the middle section of the upper main body.

[0010] In one or more exemplary embodiments of one aspect of this utility model, the upper part of the upper body may be provided with a female thread.

[0011] In one or more exemplary embodiments of this utility model, the outer diameter of the frustum end face of the buckle-making component near the upper body can be smaller than the outer diameter of the middle section of the upper body.

[0012] In one or more exemplary embodiments of one aspect of the present invention, the first cemented carbide may be evenly distributed along the circumference of the buckle-making component.

[0013] In one or more exemplary embodiments of one aspect of the present invention, the second cemented carbide may be uniformly distributed along the circumferential direction of the lower body.

[0014] In one or more exemplary embodiments of one aspect of the present invention, the third cemented carbide may be uniformly distributed along the circumference of the upper body.

[0015] In one or more exemplary embodiments of one aspect of the present invention, the shapes of the first cemented carbide, the second cemented carbide and the third cemented carbide may include columnar and block shapes.

[0016] Compared with the prior art, the beneficial effects of this utility model include at least one of the following:

[0017] (1) It can effectively and smoothly insert fish into large-sized wells, and can also make hooks for fish. It can also have the function of reverse drilling, so as to avoid the situation of complicating the well due to the inability to effectively retrieve fish.

[0018] (2) The device of this utility model has a wide range of adaptability. The spiral guide shoe can be replaced according to different well diameters, which is conducive to guiding the fish head into place, significantly improving the flexibility and success rate of retrieval, and avoiding the complication of failures caused by the inability to effectively retrieve the fish from the well. Attached Figure Description

[0019] The above and other objects and features of this utility model will become clearer from the following description taken in conjunction with the accompanying drawings, wherein:

[0020] Figure 1 A schematic diagram of the structure of an inner hook-making device with a guiding insertion function, as shown in an exemplary embodiment of the present invention, is presented.

[0021] Figure 2 A schematic diagram of the upper main body is shown;

[0022] Figure 3 A schematic diagram of the lower main body is shown;

[0023] Figure 4A A schematic diagram is shown showing how the spiral guide shoe guides the head of a fish into the device.

[0024] Figure 4B Another schematic diagram shows the spiral guide shoe leading the fish's head into the device;

[0025] Figure 5 A schematic diagram is shown showing the lower part of the cemented carbide thread entering the interior of the fish but encountering resistance before reaching the snapping part;

[0026] Figure 6 This diagram illustrates the threading depth as the threaded part enters the head of the fish to a point of consistent size.

[0027] Explanation of key figure labels:

[0028] 1-Upper body, 2-Female thread, 3-Trapezoidal male thread, 4-Third carbide, 5-Threading thread, 6-Flow channel, 7-First carbide, 8-Lower body, 9-Trapezoidal female thread, 10-Second carbide, 11-Spiral guide shoe, 12-Fish head, 13-Sediment. Detailed Implementation

[0029] In the following description, an inner hook-making device with a guiding insertion function according to the present invention will be described in detail with reference to the accompanying drawings and exemplary embodiments.

[0030] In the description of this application, it should be understood that the terms "middle," "upper," "lower," "top," "bottom," "inner," and "outer," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, and are only for the convenience of describing this application 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 on this application. The terms "first," "second," and "third," etc., are only for the convenience of description and distinction, and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Thus, features defined with "first," "second," "third," etc., may explicitly or implicitly include one or more of that feature. In the description of this application, unless otherwise stated, "multiple" or "several" means two or more. In the description of this application, it should be noted that, unless otherwise explicitly specified and limited, the terms "installed," "connected," and "linked" should be interpreted broadly, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a direct connection or an indirect connection through an intermediate medium, and it can be a connection within two elements. Those skilled in the art can understand the specific meaning of the above terms in this application based on the specific circumstances.

[0031] Exemplary Example 1

[0032] This exemplary embodiment provides an inner hook-making device with a guided insertion function.

[0033] The internal hook-making device with guided insertion function in this exemplary embodiment may include an upper body and a lower body.

[0034] The upper body comprises an upper section, a middle section, and a lower section arranged sequentially from top to bottom. A flow channel is located along the central axis of the upper body, configured to determine whether the threaded fastener has entered the fish's interior based on changes in circulating pressure. The outer diameter of the middle section is larger than that of the upper section. The connection between the upper and middle sections is chamfered, and a third hard alloy is embedded at the chamfer between the upper and middle sections. This third hard alloy assists in the eye-cleaning operation. The lower section is the fastener component, which is shaped like a frustum. The diameter of the fastener component gradually decreases as it approaches the lower body. The fastener component has a threaded fastener on its circumferential side, and a first hard alloy is embedded in the lower part of the fastener component. This first hard alloy can be used to clean sediment from inside the fish's head.

[0035] The lower body includes a lower body shell and a spiral guide shoe arranged sequentially from top to bottom. The outer diameter of the spiral guide shoe is larger than the outer diameter of the lower body shell. The connection between the lower body shell and the spiral guide shoe is a chamfered design. A second hard alloy is inlaid at the chamfer between the lower body shell and the spiral guide shoe. The second hard alloy is configured to perform a back-scratching operation when the fish is snagged during the retrieval and release process. The lower body shell is connected to the middle section of the upper body, and the buckle-making component is located in the lower body shell.

[0036] The internal retrieval and snap-fit ​​device with guiding insertion function of this exemplary embodiment is applicable to internal retrieval operations of small-diameter fish heads in various large-size wells. The outer diameter of the spiral guide shoe of this device is larger than the outer diameter of the fish head. The maximum outer diameter of the snap-fit ​​component is larger than the inner diameter of the fish head, and the minimum outer diameter is smaller than the inner diameter of the fish head.

[0037] In this exemplary embodiment, the lower main body shell and the upper main body may be threaded together.

[0038] Furthermore, the upper part of the lower body shell may be provided with a trapezoidal female thread, and the middle section of the upper body may be provided with a trapezoidal male thread, with the trapezoidal female thread and the trapezoidal male thread engaging.

[0039] In this exemplary embodiment, the outer diameter of the lower main body shell may be the same as that of the middle section of the upper main body.

[0040] In this exemplary embodiment, the upper part of the upper body may be provided with a female thread, which facilitates connection with the drilling tool.

[0041] In this exemplary embodiment, the outer diameter of the frustum end face of the buckle component near the upper body can be smaller than the outer diameter of the middle section of the upper body.

[0042] In this exemplary embodiment, the second and third cemented carbide are provided for the reverse drilling operation during the tripping process after the fish has been caught, and are used to scrape and clean the irregular well wall during the rotation of the device; the function of the first cemented carbide includes scraping and cleaning the sediment inside the water hole of the fish head, so as to avoid the sediment affecting the insertion of the thread or preventing normal threading.

[0043] In this exemplary embodiment, the three cemented carbide components in the device of this utility model can all be evenly distributed circumferentially. They are wear-resistant and high-temperature resistant materials with a series of excellent properties such as high hardness, wear resistance, good strength and toughness, heat resistance, and corrosion resistance. In particular, their high hardness and wear resistance remain essentially unchanged even at a temperature of 500°C, and they still have very high hardness at 1000°C. The shape can be columnar or blocky, and they are used to scrape or clean the sediment in the water eye of a fish, providing conditions for making threads for fishing.

[0044] The working principle of this utility model's internal hook-making device with guiding insertion function includes: after the fish head is guided into the device by the spiral guide shoe, the drill bit continues to be lowered. The spiral guide shoe forces the fish head to move towards the center point of the device, causing the hook-making thread to enter the fish head. By circulating and rotating the device with a pump, the hard alloy at the lower part of the hook-making thread can clean the sediment inside the fish head, ensuring the smooth progress of the hook-making operation. When the hook-making thread enters the fish head to a consistent size, the device is rotated at a low speed, causing the hook-making thread to penetrate the inner wall of the fish, thereby connecting the device to the fish. Finally, the fish is retrieved by removing the device. Here, the rotation speed of the device during sediment cleaning is higher than that during hook-making, for example, 5 rpm / min higher. The lower rotation speed during hook-making ensures stability during hook-making.

[0045] The method of using / working process of this utility model device may specifically include the following steps:

[0046] S1, Calculate the data.

[0047] S2. The retrieval assembly consisting of an internal retrieval and hook-making device with guiding and fitting function, a drill check valve, a drill collar, and a drill pipe is assembled on-site.

[0048] S3. Lower the assembled salvage unit to a distance of 2-5m from the top of the fish.

[0049] S4. Circulate the drilling fluid for more than one and a half cycles after starting the pump.

[0050] S5. Weighing.

[0051] S6, Salvage.

[0052] S7. Raise the drill string to retrieve the fishing assembly and the fish.

[0053] Step S1 calculates the data, namely the depth at which the spiral guide shoe hits the top of the fish, the depth at which the lower part of the carbide thread hits the top of the fish, and the threading depth (the depth at which the threading thread enters the fish's head to a point of consistent size). This provides data support before, during, and after the salvage operation.

[0054] Step S2 involves assembling the retrieval assembly on-site, consisting of an internal retrieval and hook-making device with guiding insertion function, a drill check valve, a drill collar, and a drill rod. The connection method is to assemble the device, drill check valve, drill collar, and drill rod sequentially from bottom to top. The retrieval assembly can also be referred to as a retrieval drill string, i.e., the drill string mentioned below. A suitable internal retrieval and hook-making device with guiding insertion function is selected based on the inner diameter of the object (i.e., the fish) and the drill bit size; that is, the maximum outer diameter of the auger shoe is 15–60 mm smaller than the drill bit size.

[0055] Step S3 involves lowering the assembled salvage unit into the well, 2-5 meters from the top of the fish.

[0056] Step S4: Circulate the drilling fluid through the pump for at least one and a half cycles to remove gas intrusion. One cycle refers to the time it takes for the drilling fluid to travel from entering the drill string's water inlet, exiting the drill string's water inlet, and finally returning to the surface through the wellbore annulus. One cycle can also be called a circulation cycle, which is the time required for the drilling fluid to be pumped into the wellhead and then returned to the surface.

[0057] Step S5: Weigh and record the displacement and pump pressure under pump-on conditions, the suspended weight of the drill string during uniform lifting, the suspended weight of the drill string during uniform lowering, the torque value and suspended weight when rotating the drill string at a speed of 5-10 rpm / min when lifting and lowering stop, the torque value and suspended weight when rotating the drill string at a speed of 5-10 rpm / min during uniform lifting, and the torque value and suspended weight when rotating the drill string at a speed of 5-10 rpm / min during uniform lowering (20-30% of the displacement used during normal drilling).

[0058] Record the suspended weight of the drill string when it is being lifted and lowered at a constant speed while the pump is stopped; record the torque value and suspended weight when the drill string is rotated at a speed of 5-10 rpm / min when lifting and lowering stops; record the torque value and suspended weight when the drill string is being lifted and lowered at a constant speed while rotating at a speed of 5-10 rpm / min; record the torque value and suspended weight when the drill string is being lifted and lowered at a constant speed while rotating at a speed of 5-10 rpm / min (the rotation speed during weighing should be the same as the rotation speed during subsequent threading and tightening to ensure the accuracy of the weighing data).

[0059] Since the threaded connection of the device does not enter the fish head when the pump is running, the pump pressure is the same as the pump pressure during weighing. Once it enters, the pump pressure will increase significantly. Therefore, the pump pressure must be recorded during weighing, which also reflects the importance of weighing.

[0060] Step S6: Retrieve the fish. Operate the retrieval assembly to retrieve the fish. Rotate and lower the drill string at a speed of 5-10 rpm / min. By rotating this device, the auger guides the fish's head into the device (e.g., Figure 4A or Figure 4B ).

[0061] When the lower part of the carbide thread enters the fish but encounters resistance before reaching the snapping point (e.g.) Figure 5 The operator maintains the suspended weight by raising or lowering the drill bit, as the time required to clean the sediment inside the fallen fish is still uncertain. The suspended weight is kept less than 5-10 kN when the drill bit is rotated at a speed of 5-10 rpm and lowered at a constant speed under pump operation. The torque value is limited to 1-2 kN·m greater than the torque value when the drill bit is rotated at a speed of 5-10 rpm and lowered at a constant speed under pump operation. The sediment inside the head of the fallen fish is cleaned by rotating the carbide and circulating the pump.

[0062] Lower the drill string to the snap-in depth (e.g.) Figure 6When the threaded part enters the fish head to a depth consistent with the size and the pump pressure rises by 1 MPa or more, stop the pump and stop rotating the drill bit to create the thread; limit the torque of the top drive device to be 2 kN.m greater than the torque value when the drill bit is rotated at a speed of 5-10 rpm / min and lowered at a constant speed when the pump is stopped; during the threading process, keep the suspended weight less than 10-20 kN of the suspended weight when the drill bit is rotated at a speed of 5-10 rpm / min and lowered at a constant speed when the pump is stopped. When the torque value reaches the set torque and the pump stops, slowly release the torque and perform the threading operation twice: limit the torque of the top drive device to be 3 kN.m greater than the torque value when the drill bit is rotated at a speed of 5-10 rpm / min and lowered at a constant speed when the pump is stopped; during the threading process, keep the suspended weight less than 20-30 kN of the suspended weight when the drill bit is rotated at a speed of 5-10 rpm / min and lowered at a constant speed when the pump is stopped. When the torque value reaches the set torque and the pump stops, slowly release the torque.

[0063] Raise and lower the drill string three times. When raising the drill string, the suspended weight should not exceed 30-50 kN of the suspended weight when the pump is stopped during weighing. When lowering the drill string, the suspended weight should not exceed 30 kN of the suspended weight when the pump is stopped during weighing. Perform the locking operation again: the torque should be 3-5 kN·m greater than the torque value when the drill string is lowered at a constant speed of 5-10 rpm / min when the pump is stopped. During locking, keep the suspended weight less than 30 kN of the suspended weight when the drill string is lowered at a constant speed of 5-10 rpm / min when the pump is stopped. When the torque value reaches the set torque and the lock is stopped, slowly release the torque.

[0064] In step S7, lift the drill string to retrieve the retrieval assembly and the fallen object. After retrieval, remove the retrieval assembly and the fallen object from the well. If the suspended weight of the drill string during lifting exceeds the sum of the suspended weight of the drill string and the suspended weight of the fallen fish when the pump is stopped, plus an additional 100kN, and then stops increasing, it indicates that the fallen fish has been retrieved. If the suspended weight during lifting continues to increase, it indicates that the fallen fish is stuck.

[0065] After the fish gets stuck, a reverse reaming operation is performed: The suspended weight is limited to 5-10 kN when the drill bit is rotated at a constant speed of 5-10 rpm while the pump is stopped, and the torque is limited to 3-5 kN·m, greater than the torque value when the drill bit is rotated at a constant speed of 5-10 rpm while the pump is stopped. The drill bit is rotated at 5-10 rpm, and the reverse reaming operation is performed using the externally embedded carbide (second and third carbide). Once the suspended weight and torque values ​​have decreased to stable values, the rotation of the drill bit is stopped, and then the drill bit is lifted again. Here, an intermittent rotation method can be used. This not only avoids the need for repeated lifting and lowering of the drill bit to unstick the fish, reducing the repeated tension and pressure on the threaded joint, but also increases the threading torque when lifting is obstructed, further preventing the fish from slipping off the threaded joint and ensuring successful retrieval.

[0066] To better understand the exemplary embodiments of the present invention described above, further explanation is provided below with reference to specific examples.

[0067] Example 1

[0068] This example provides an internal hook-making device with a guided insertion function.

[0069] like Figures 1-6 The device may include an upper body 1, a female thread 2, a trapezoidal male thread 3, a third carbide thread 4, a thread-forming thread 5, a flow channel 6, a first carbide thread 7, a lower body 8, a trapezoidal female thread 9, a second carbide thread 10, and a spiral guide shoe 11. It should also be noted that the top-to-bottom direction described in the specification refers to... Figure 1 The direction from left to right in the middle.

[0070] The upper body 1 has a female thread 2 connected to the drill string on its upper part, and a third carbide 4 is embedded in the chamfered corner to assist in the reaming operation. The middle part has a trapezoidal male thread 3 connected to the lower body, and the lower part has a threading thread 5. A first carbide 7 is embedded at the bottom to clean the sediment 13 inside the fish head 12, ensuring the smooth execution of the threading operation. The upper body 1 also has a flow channel 6 in the middle for fluid passage. Changes in circulating pressure can be used to determine whether the threading thread has entered the fish head, and it can also circulate the fluid above the fish head and in the annulus, carrying away sediment from the wellbore and providing support for the successful retrieval of the fish head.

[0071] The lower body 8 is equipped with a trapezoidal female thread 9 that connects to the upper body 1. The trapezoidal male thread 3 and the trapezoidal female thread 9 facilitate quick threading and unthreading by operators and prevent mis-threading. A second carbide 10 is embedded at the chamfered corner of the lower body 8 for back-reaming operations when encountering entanglement during fish retrieval. During the tripping process to retrieve the fish, the second and third carbide assemblies provide favorable conditions for smooth passage through wellhead equipment, casing shoes, and irregular well sections, ensuring operational safety and efficiency. A spiral guide shoe 11 is located at the bottom of the lower body 8. By rotating, it guides the smaller-diameter fish head into the lower body and centers it, providing conditions for the threading thread 5 to smoothly enter the fish head. The spiral guide shoe 11 can be replaced according to the wellbore size and is suitable for internal retrieval operations of smaller-diameter fish heads in various large-diameter wells.

[0072] In summary, the advantages proposed by this utility model include at least one of the following:

[0073] (1) It can safely, quickly and effectively retrieve fish that have fallen into the drill string in large-diameter wells; the spiral guide shoe of this application can be replaced according to the well size, which can reduce the problems caused by the large well annular space gap to a greater extent and guide fish with small outer diameter into the device, thereby achieving the purpose of retrieval.

[0074] (2) The device of this application has embedded hard alloy (second hard alloy, third hard alloy), and the rotating device can correct the well wall of irregular well sections to achieve the purpose of passing through; moreover, the threaded part does not bear torque, tension and pressure, but is borne by the outside of the device body; that is, the device can effectively and smoothly fit the fallen fish in a large-size well hole, and can also make a thread inside the head of the fallen fish and have the function of reverse scratching, providing conditions for the smooth retrieval after the fallen fish is caught, and significantly shortening the fault handling cycle.

[0075] (3) Conventional fishing tools have a large gap between themselves and the wellbore annulus, which makes it easy for them to go over the fish head. They have to repeatedly pump at the fish head for a long time to fish. Since they cannot enter the fish head, conventional fishing tools repeatedly scrape the well wall, which can easily lead to stuck drill. In other words, conventional fishing tools have low fishing efficiency because they cannot effectively enter the fish head, which makes downhole faults more complicated. In contrast, this device can guide fish with small outer diameters into the device, which can avoid the complexity of faults caused by the inability to effectively fish out of the wellbore. It saves drilling time and achieves the goal of improving quality and efficiency, and has broad application prospects.

[0076] Although the present invention has been described above in conjunction with exemplary embodiments, those skilled in the art will understand that various modifications and changes can be made to the exemplary embodiments of the present invention without departing from the spirit and scope defined by the claims.

Claims

1. An inner-loop fastening device with a guiding insertion function, characterized in that, The device includes an upper body and a lower body, wherein... The upper body includes an upper section, a middle section, and a lower section arranged sequentially from top to bottom. A flow channel is provided in the direction of the central axis of the upper body. The outer diameter of the middle section is larger than that of the upper section. A third hard alloy is inlaid at the chamfer between the upper section and the middle section. The lower section is a buckling component. The buckling component is truncated cone in shape. The diameter of the buckling component gradually decreases as it gets closer to the lower body. The buckling component has buckling threads on its circumferential side. A first hard alloy is inlaid at the lower part of the buckling component. The lower body includes a lower body shell and a spiral guide shoe arranged sequentially from top to bottom. The outer diameter of the spiral guide shoe is larger than the outer diameter of the lower body shell. A second hard alloy is inlaid at the chamfer between the lower body shell and the spiral guide shoe. The lower body shell is connected to the middle section of the upper body, and the buckle component is located in the lower body shell.

2. The inner hook-making device with guiding insertion function according to claim 1, characterized in that, The lower main body shell is threadedly connected to the upper main body.

3. The inner hook-making device with guiding insertion function according to claim 2, characterized in that, The lower main body shell is provided with a trapezoidal female thread on the upper part, and the middle section of the upper main body is provided with a trapezoidal male thread, with the trapezoidal female thread and the trapezoidal male thread engaging.

4. The inner hook-making device with guiding insertion function according to claim 1, characterized in that, The outer diameter of the lower main body shell is the same as that of the middle section of the upper main body.

5. The inner hook-making device with guiding insertion function according to claim 1, characterized in that, The upper section of the upper body is provided with a female thread.

6. The inner hook-making device with guiding insertion function according to claim 1, characterized in that, The outer diameter of the frustum end face of the buckle component near the upper body is smaller than the outer diameter of the middle section of the upper body.

7. The inner hook-making device with guiding insertion function according to claim 1, characterized in that, The first cemented carbide is evenly distributed along the circumference of the buckle component.

8. The inner hook-making device with guiding insertion function according to claim 1, characterized in that, The second cemented carbide is evenly distributed along the circumference of the lower body.

9. The inner hook-making device with guiding insertion function according to claim 1, characterized in that, The third cemented carbide is evenly distributed along the circumference of the upper body.

10. The inner hook-making device with guiding insertion function according to claim 1, characterized in that, The shapes of the first cemented carbide, the second cemented carbide, and the third cemented carbide include columnar and block shapes.

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