A torque self-triggering sequential driving inner-expanding reinforced fishing tap

Abstract

This application provides a torque-triggered sequential drive internal expansion enhanced fishing male cone, belonging to the field of oil and gas well downhole fishing tools. It includes a male cone connector, a deployable male cone body connected to the male cone connector, an external rotary bearing drive mechanism including a torque transmission bearing sleeve connected to the male cone connector, and a drill pipe connector housed within the torque transmission bearing sleeve, and an internal rotary propulsion expansion mechanism for driving the deployable male cone body to expand radially outward. During initial threading, the drill pipe connector drives the external male cone body to rotate synchronously via a shear pin and the torque transmission bearing sleeve. After the threading torque reaches the set shear torque, the shear pin breaks, the drill pipe connector continues to rotate, and drives the internal drive spindle downward through the guide spline and feed thread pair, causing the internal elliptical expansion body to push the deployable male cone body to expand radially outward. This achieves sequential actions of external threading, torque triggering, internal expansion, and external bearing, improving the anti-slipping, anti-disengagement capabilities, and load-bearing reliability of the fishing connection.

Description

Technical Field

[0001] This application relates to the field of downhole fishing tools for oil and gas wells, and in particular to a torque-triggered sequential drive internal expansion enhanced fishing male cone. Background Technology

[0002] The retrieval cone is a commonly used downhole retrieval tool in oil and gas drilling and well workover operations. It is mainly used to retrieve broken, fallen, or stuck drill pipes, drill collars, tubing, casing, and other metal parts with internal boreholes. Its basic working principle is that the cone's external tapered retrieval thread enters the inner bore of the stuck part and rotates to create a threaded connection between the cone and the inner wall of the stuck part. Then, the drill string is lifted to pull the stuck part out of the well.

[0003] However, in ultra-deep wells with small boreholes, the well space is limited, the drill string length is long, and the motion control and load transfer of downhole tools are complex. The fishing tool must possess reliable threading and engagement capabilities, and ensure stable load transfer after threading. Traditional fishing male conical tools typically rely on external tapered threads to create a single thread connection for fishing. After threading, the contact area and thread penetration depth between the male conical tool and the inner wall of the fish are difficult to actively increase. When the inner wall of the fish is worn, deformed, or the threading is insufficient, problems such as slippage and disengagement can easily occur. Summary of the Invention

[0004] In view of this, the purpose of this application is to provide a torque self-triggered sequential drive internal expansion enhanced fishing male cone, in order to solve the problem that after the existing technology is completed, the contact area and tooth groove penetration depth between the male cone and the inner wall of the fish are difficult to continue to increase actively, which leads to problems such as slippage and derailment.

[0005] The technical solution adopted in this application to solve the above-mentioned technical problems is as follows: An embodiment of the present invention provides a torque-triggered sequential drive internal expansion enhanced salvage male cone, comprising: The outer male cone body includes a male cone connector and an expandable male cone body connected to the male cone connector. The expandable male cone body is provided with an external retrieval thread on its outer periphery. An external rotary bearing drive mechanism includes a torque-transmitting bearing sleeve connected to the male conical joint. A drill pipe joint is provided inside the torque-transmitting bearing sleeve, and the drill pipe joint and the torque-transmitting bearing sleeve are locked by a shear pin. An internal rotary propulsion expansion mechanism, located within the drill pipe joint and extending into the outer male cone body, is used to drive the deployable male cone body to expand radially outward.

[0006] In some embodiments, the deployable male cone includes a plurality of male cone petals, and an axial opening groove is provided between two adjacent male cone petals.

[0007] In some embodiments, the drill pipe joint extends to the outer side of the torque-bearing sleeve away from the male tapered joint, and the external rotational tension drive mechanism further includes an upper cover a, which is sleeved on the drill pipe joint at the end of the torque-bearing sleeve, and the upper cover a and the torque-bearing sleeve are fastened together by a plurality of upper cover screws.

[0008] In some embodiments, a first bearing and a second bearing are provided between the drill pipe joint and the torsion-bearing sleeve, and the first bearing and the second bearing are respectively located on both sides of the shear pin along the axial direction of the drill pipe joint.

[0009] In some embodiments, a sealing ring is provided between the drill pipe joint on the side of the first bearing away from the second bearing and the torque-bearing sleeve.

[0010] In some embodiments, the internal rotary propulsion expansion mechanism includes a fixing nut located inside the male cone joint, the fixing nut being fixedly connected to the male cone joint by screw a; it also includes an internal drive spindle, the internal drive spindle being arranged along the central axis of the external male cone body, a guide keyway being provided in the lower part of the drill pipe joint, and the upper part of the internal drive spindle forming an axially sliding circumferential transmission engagement with the guide keyway through a guide spline; an external thread is provided on the outer periphery of the lower middle part of the internal drive spindle, and an internal thread is provided inside the fixing nut, the external thread and the internal thread engaging to form a feed thread pair; an internal expansion section is provided at the end of the internal drive spindle away from the guide spline.

[0011] In some embodiments, the internal expansion section includes an elliptical expansion body, and a plurality of guide grooves are provided on the elliptical expansion body along the axial direction of the internal drive spindle.

[0012] In some embodiments, the inner drive spindle has a liquid channel axially arranged inside, and the inner drive spindle between the external thread and the elliptical expansion body has a plurality of liquid outlet holes communicating with the liquid channel.

[0013] In some embodiments, the effective axial engagement length of the guide spline and the guide keyway is not less than the maximum feed stroke of the inner drive spindle, so that the guide spline and the guide keyway maintain circumferential transmission engagement throughout the entire process of the inner drive spindle moving axially downward relative to the fixed nut.

[0014] In some embodiments, the infeed angle of the external retrieval thread is 25° to 45°; and / or The tension face angle of the external retrieval thread is 5° to 15°; and / or The pitch of the external retrieval thread is 2.5mm to 4.2mm; and / or When the deployable male cone is in the undeployed state, the taper of the external retrieval thread is 1:8 to 1:16.

[0015] In this application, a torque-triggered mechanism for hooking is established through a shear pin, enabling the torque-triggered sequential drive of the internally expanded and reinforced fishing male cone to automatically switch actions based on torque changes during the initial hooking stage. When the shear pin is not sheared, the outer male cone body rotates synchronously with the drill pipe joint and completes the initial hooking; when the hooking torque reaches the set shearing torque, the shear pin is sheared, the drill pipe joint and the torque-transmitting tension sleeve are released from circumferential locking, and the torque-triggered sequential drive of the internally expanded and reinforced fishing male cone automatically switches from the external hooking stage to the internal expansion and reinforcement stage, avoiding the problem of relying solely on manual judgment or complex hydraulic control to achieve action switching; The sequential drive of external threading and internal expansion is achieved by utilizing the rotational power of the same drill pipe a. After the shear pin is cut off, the external male cone body remains basically stationary due to the initial engagement with the inner wall of the fish. The drill pipe joint continues to rotate, and through the guide spline and feed thread pair, it drives the inner drive mandrel to move axially downward, causing the elliptical expansion body to push the deployable male cone body to expand radially outward, thereby further pressing the external fishing thread into the inner wall of the fish, improving the engagement depth and connection reliability. The system employs a force transmission structure that separates external tension and internal propulsion. During lifting and retrieval, the main axial tensile force is transmitted to the fish through the drill pipe joint, torsion-transmitting tension sleeve, male cone joint, and deployable male cone. The internal drive spindle mainly undertakes internal propulsion and expansion functions and does not serve as the main load-bearing component for lifting. This reduces the risk of tensile deformation or breakage of the internal drive spindle under heavy-load retrieval conditions and improves the overall load-bearing safety. By using a guide spline and feed thread pair, the continued rotation of the drill pipe joint is converted into the axial downward motion of the internal drive mandrel. This process does not require the drill pipe a to continue to be pressed down, and the elliptical expansion body can be sent into the deployable male cone body, which reduces the difficulty of drilling pressure control under the condition of small wellbore in ultra-deep wells and improves the controllability of tool movements. Attached Figure Description

[0016] To more clearly illustrate the technical solutions of the embodiments of this application, the accompanying drawings of the embodiments will be briefly described below. Obviously, the drawings described below only relate to some embodiments of this application and are not intended to limit this application, wherein: Figure 1 This is a schematic diagram of the overall structure of the present invention; Figure 2 This is a schematic diagram of the internal expansion reinforcement stroke structure after buckling in this invention; Figure 3 yes Figure 2 A magnified view of the structure at point B in the middle; Figure 4This is a top view schematic diagram of the fit between the deployable male cone and the elliptical expansion body of the present invention; Figure 5 This is a schematic diagram of the mating structure of the guide keyway and guide spline of the present invention; Figure 6 This is an exploded view of the torque-triggered sequential drive internal expansion enhanced salvage cone of this application before it is deployed; Figure 7 This is an exploded view of the torque-triggered sequential drive internal expansion enhanced salvage cone during deployment, as described in this application. Figure 8 This is a three-dimensional view of the torque-triggered sequential drive internal expansion enhanced salvage male cone of this application when it is not deployed; Figure 9 This is a three-dimensional view of the internal expansion enhanced salvage cone during the deployment of the torque self-triggered sequential drive of this application.

[0017] Explanation of reference numerals in the attached figures: 1-Drill pipe a, 2-Drill pipe joint, 3-Top cover screw, 4-First bearing, 5-Shear pin, 6-Second bearing, 7-Torque transmission and tension sleeve, 8-Screw a, 9-Fixing nut, 10-Male tapered joint, 11-Internal expansion section, 111-Guide groove, 112-Elliptical expansion body, 12-Top cover a, 13-Internal drive spindle, 14-Feed thread pair, 15-Liquid channel, 16-Expandable male tapered body, 161-External retrieval thread, 162-Opening groove, 163-Male tapered flap, 17-Fish dropper, 18-Sealing ring, 19-Guide keyway, 20-Guide spline, 21-Liquid outlet through hole. Detailed Implementation

[0018] The technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this application, and not all embodiments. Based on the embodiments of this application, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this application.

[0019] In the description of this application, it should be understood that the terms "length," "width," "thickness," "upper," "lower," "vertical," "horizontal," "top," "bottom," "inner," and "outer," etc., indicating orientation or positional relationships based on the orientation or positional relationships shown in the accompanying drawings, 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 unique orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this application. Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or specifying the number of indicated technical features. Thus, features defined with "first" and "second" may explicitly or implicitly include one or more features. In the description of this application, "multiple" means two or more, unless otherwise explicitly specified.

[0020] In this application, the term "exemplary" is used to mean "serving as an example, illustration, or description." Any embodiment described as "exemplary" in this application is not necessarily to be construed as being more preferred or advantageous than other embodiments. The following description is provided to enable any person skilled in the art to make and use this application. Details are set forth in the following description for purposes of explanation. It should be understood that those skilled in the art will recognize that this application can be made without using these specific details. In other instances, known structures and processes are not described in detail to avoid obscuring the description of this application with unnecessary detail. Therefore, this application is not intended to be limited to the embodiments shown, but is consistent with the broadest scope of the principles disclosed in this application.

[0021] Please see Figures 1 to 3 , Figures 6 to 9 Embodiments of this application provide a torque-triggered sequentially driven internal expansion enhanced salvage male cone, comprising: The outer male cone body includes a male cone connector 10 and an expandable male cone 16 connected to the male cone connector 10. The expandable male cone 16 is provided with an external retrieval thread 161 on its outer periphery. The external rotary bearing drive mechanism includes a torque transmission bearing sleeve 7 connected to the male conical joint 10. A drill pipe joint 2 is provided inside the torque transmission bearing sleeve 7. The drill pipe joint 2 and the torque transmission bearing sleeve 7 are fixed by a shear pin 5. An internal rotary propulsion expansion mechanism, located within the drill pipe joint 2 and extending into the outer male cone body, is used to drive the deployable male cone 16 to expand radially outward.

[0022] During operation, drill pipe joint 2 is fixedly connected to external drill pipe a1. The torque-triggered sequential drive internal expansion enhanced fishing male cone is lowered into the wellbore and inserted into the inner hole of the fish 17. The overall rotation torque-triggered sequential drive internal expansion enhanced fishing male cone causes the external fishing thread 161 on the outer periphery of the deployable male cone 16 to form an initial thread engagement with the inner wall of the fish 17. When the threading torque reaches the set shearing torque of the shearing pin 5, the shearing pin 5 is sheared, releasing the circumferential lock between drill pipe joint 2 and torque transmission bearing sleeve 7. Drill pipe joint 2 continues to rotate without axially descending with the internal drive mandrel 13, and drives the deployable male cone 16 to unfold (radially outward) through the internal rotation propulsion expansion mechanism, thereby enhancing the engagement between the external fishing thread 161 and the inner wall of the fish 17. During the lifting and retrieval process, the axial tension transmitted by the drill rod a1 is transmitted to the fish 17 through the axial bearing fit between the drill rod joint 2 and the torsion bearing sleeve 7, the torsion bearing sleeve 7, the male cone joint 10, and the deployable male cone 16.

[0023] It is understood that the drill pipe joint 2 and the torsion-bearing sleeve 7 are fixed by shear pins 5, wherein the fixing is a temporary circumferential lock.

[0024] Alternatively, it can be understood that shear pin 5 is used for temporary circumferential locking.

[0025] It is understandable that when the overall rotational torque self-triggers sequentially drives the internal expansion to strengthen the fishing male cone, the drill pipe provides rotational power.

[0026] Please see Figures 6 to 9 In some embodiments, the male cone connector 10 and the deployable male cone 16 are an integral structure, so that the entire external male cone body is stable and firm and easy to process.

[0027] In some embodiments, the male tapered connector 10 and the deployable male tapered body 16 are separate structures, which can be fixed by threads or welding; if they are threaded, they can be easily replaced when one of them is damaged.

[0028] It is understandable that the external retrieval thread 161 provided on the outer periphery of the deployable male cone 16 is used to enter the inner hole of the fish dropper 17 and engage with the inner wall of the fish dropper 17 during rotation.

[0029] Please see Figure 1 and Figure 2 In some embodiments, the torque-transmitting tension sleeve 7 is connected to the end of the male tapered joint 10 away from the deployable male cone 16 via a tapered thread. It can be understood that the tapered thread gradually increases the contact pressure of the threaded mating surfaces during engagement, thereby improving the connection tightness, anti-loosening ability, and axial load-bearing capacity between the torque-transmitting tension sleeve 7 and the male tapered joint 10, which is beneficial for ensuring the stable transmission of the threading torque and lifting load.

[0030] Please see Figure 1 and Figure 2 In some embodiments, the drill pipe joint 2 is connected to the drill pipe a1 by a tapered thread.

[0031] It is understandable that before the shear pin 5 is cut off, the torque transmission sleeve 7 is used to transmit the torque of the drill pipe to the male cone joint 10 and the deployable male cone 16 during the initial snapping stage; after the shear pin 5 is cut off, the torque transmission sleeve 7 maintains the axial connection between the outer male cone body and the drill pipe joint 2 to prevent the outer male cone body from falling down with the fish 17, and transmits the axial tension transmitted by the drill pipe joint 2 to the outer male cone body when it is lifted up for retrieval.

[0032] It is understandable that the shear pin 5 is inserted between the drill pipe joint 2 and the torsion bearing sleeve 7 to temporarily lock the two circumferentially during the initial snap-fit ​​stage.

[0033] In some embodiments, the set shearing torque of the shearing pin 5 is greater than the initial thread engagement torque required for the external retrieval thread 161 to form an initial thread engagement with the inner wall of the fish 17, and less than the minimum value among the allowable limit torques of the external male cone body, the torque transmission and tension sleeve 7, and the drill pipe joint 2. With this structure, the shearing pin 5 can be sheared after the external retrieval thread 161 forms an initial engagement, so that the torque self-triggered sequential drive of the internal expansion strengthening retrieval male cone can switch from the external thread engagement stage to the internal expansion strengthening stage, thereby realizing the sequential mechanical action switching triggered by the thread engagement torque.

[0034] Please see Figure 4 , Figures 6 to 9 In some embodiments, the deployable male cone 16 includes a plurality of male cone petals 163, and an axial opening groove 162 is provided between two adjacent male cone petals 163.

[0035] It can be understood that the opening slot 162 is provided along the axial direction of the deployable male cone 16, which refers to the direction of the longitudinal central axis of the deployable male cone 16.

[0036] It is understood that the opening groove 162 is arranged along the axial direction of the deployable male cone 16 and is located between two adjacent male cone petals 163. The opening groove 162 is provided to facilitate the opening of multiple male cone petals 163.

[0037] It can also be understood that the opening groove 162 extends along the axial direction of the deployable male cone 16, and is used to divide the end of the deployable male cone 16 away from the male cone joint 10 into a plurality of male cone petals 163 that can be relatively radially deployed, and to provide deformation space for each male cone petal 163 to expand radially outward under the action of the internal elliptical expansion body 112.

[0038] In some embodiments, the plurality of male cone-shaped valves 163 include any one of three-lobed, four-lobed, five-lobed, six-lobed, seven-lobed, and eight-lobed male cone-shaped valves 163.

[0039] Preferably, the plurality of male cone valves 163 are four-lobed male cone valves 163.

[0040] For example, the deployable male cone 16 is a four-lobed deployable male cone 16.

[0041] It is understandable that multiple male cone valves 163 are mainly for ease of manufacture and practicality. The number of male cone valves 163 can be more or less than the number specified above.

[0042] For example, the material of the plurality of male cone-shaped valves 163 can be alloy steel, such as 42CrMo.

[0043] Please see Figure 1 , Figures 6 to 9 Furthermore, the outer surface of the male conical petal 163 is provided with the external retrieval threads 161. It can be understood that each male conical petal 163 is provided with a threaded segment, and each threaded segment is arranged along the same conical helical trajectory, with adjacent threaded segments separated by an opening groove 162.

[0044] Please see Figure 2 , Figures 6 to 9 In some embodiments, the drill pipe joint 2 extends to the outer side of the torque-bearing sleeve 7 away from the male tapered joint 10. The external rotational tension drive mechanism also includes an upper cover a12, which is sleeved on the drill pipe joint 2 at the end of the torque-bearing sleeve 7. The upper cover a12 and the torque-bearing sleeve 7 are fastened together by a plurality of upper cover screws 3.

[0045] It is understandable that the upper cover a12 is used to seal the area where the drill pipe joint 2 and the torsion bearing sleeve 7 mate.

[0046] In some embodiments, a first bearing 4 and a second bearing 6 are provided between the drill pipe joint 2 and the torsion-bearing sleeve 7, and the first bearing 4 and the second bearing 6 are located on both sides of the shear pin 5 along the axial direction of the drill pipe joint 2.

[0047] It is understood that the first bearing 4 and the second bearing 6 are both sleeved on the drill pipe joint 2; wherein, the first bearing 4 is located on the side of the shear pin 5 near the drill pipe a1, and the second bearing 6 is located on the side of the shear pin 5 near the male tapered joint 10.

[0048] It can be understood that the axial direction of drill pipe joint 2 is the same as the longitudinal central axis direction of drill pipe joint 2.

[0049] For example, the first bearing 4 is an upper thrust bearing, and the second bearing 6 is a lower thrust bearing. It can be understood that the drill pipe joint 2 and the torsion-bearing sleeve 7 form an axially limiting fit that can rotate relative to each other and transmit axial loads through the upper and lower thrust bearings.

[0050] It can also be understood that the first bearing 4 and the second bearing 6 are set up to support the rotation of the drill pipe joint 2 relative to the torsion bearing sleeve 7 after the shearing pin 5 is sheared, and to keep the drill pipe joint 2 and the torsion bearing sleeve 7 axially bearing connected in the relative rotation state.

[0051] In some embodiments, a sealing ring 18 is provided between the drill pipe joint 2 on the side of the first bearing 4 away from the second bearing 6 and the torque-bearing sleeve 7.

[0052] It is understandable that the sealing ring 18 is located inside the upper cover a12.

[0053] It can also be understood that the upper cover a12 provides axial (along the longitudinal direction of the drill pipe joint 2) limiting of the upper thrust bearing, the sealing ring 18, and the lower thrust bearing to prevent axial movement or dislodgement during rotation and lifting.

[0054] It can also be understood that the upper cover a12 cooperates with the sealing ring 18 to reduce the entry of well fluid, mud, sand and debris into the area where the upper thrust bearing, lower thrust bearing and shear pin 5 are located.

[0055] Please see Figure 2 and Figure 5 In some embodiments, the internal rotary propulsion expansion mechanism includes a fixing nut 9 located inside the male cone joint 10, the fixing nut 9 being fixedly connected to the male cone joint 10 by a screw a8; it also includes an internal drive spindle 13, the internal drive spindle 13 being arranged along the central axis of the external male cone body, a guide keyway 19 being provided in the lower part of the drill pipe joint 2, and the upper part of the internal drive spindle 13 forming an axially sliding circumferential transmission engagement with the guide keyway 19 through a guide spline 20; an external thread is provided on the outer periphery of the lower middle part of the internal drive spindle 13, and an internal thread is provided in the fixing nut 9, the external thread and the internal thread engaging to form a feed thread pair 14; an internal expansion section 11 is provided at the end of the internal drive spindle 13 away from the guide spline 20.

[0056] For example, the inner drive spindle 13 is integrally formed with the inner expansion section 11, so that the whole structure is stable and firm.

[0057] Please see Figure 7 and Figure 9In some embodiments, the internal expansion section 11 includes an elliptical expansion body 112, and a plurality of guide grooves 111 are provided on the elliptical expansion body 112 along the axial direction of the internal drive spindle 13.

[0058] For example, the convex arc surface of the elliptical expansion body 112 is disposed at one end away from the inner drive spindle 13 and cooperates with the inner wall of the expandable male cone 16 so that when the inner expansion section 11 moves downward, the end of the expandable male cone 16 away from the male cone joint 10 is preferentially expanded.

[0059] For example, the number of guide channels 111 may be three, four, five, six, seven, eight, etc., and preferably, there may be four guide channels 111.

[0060] In this application, the shearing pin 5, guide spline 20, and feed thread pair 14 are configured such that: when the shearing pin 5 is not sheared, the drill pipe joint 2 drives the outer male cone body to rotate synchronously through the shearing pin 5 and the torque transmission and tension sleeve 7, so that the outer retrieval thread 161 forms an initial thread engagement with the inner wall of the fish 17; when the snapping torque reaches the set shearing torque of the shearing pin 5, the shearing pin 5 is sheared, so that the drill pipe joint 2 and the torque transmission and tension sleeve 7 are released from circumferential locking, and the drill pipe joint 2 continues to rotate without axially descending with the inner drive spindle 13, and drives the inner drive spindle 13 to rotate through the guide spline 20. The inner drive spindle 13 descends axially relative to the fixed nut 9 through the feed thread pair 14, so that the elliptical expansion body 112 pushes the deployable male cone 16 to radially expand outward; During the lifting and retrieval process, the axial tension transmitted by the drill rod a1 is transmitted to the fish 17 via the axial bearing fit between the drill rod joint 2 and the torsion bearing sleeve 7, the torsion bearing sleeve 7, the male cone joint 10, and the deployable male cone 16. The inner drive spindle 13 is not in the main transmission path of the aforementioned axial tension.

[0061] Please see Figure 6 and Figure 7 In some embodiments, the inner drive spindle 13 is provided with a liquid channel 15 in the internal axial direction, and the inner drive spindle 13 between the external thread and the elliptical expansion body 112 is provided with a plurality of liquid outlet holes 21 communicating with the liquid channel 15.

[0062] It is understood that the flushing fluid flows out through multiple liquid outlet holes 21 via the liquid channel 15 and is discharged through the guide groove 111, and discharges the debris generated during the buckling and expansion process, so as to reduce the risk of jamming between the elliptical expansion body 112 and the deployable male cone 16.

[0063] For example, the plurality of liquid outlet holes 21 may be three, four, five, six, seven, eight, etc., arranged circumferentially along the inner drive spindle 13 between the external thread and the elliptical expansion body 112, and communicate with the liquid channel 15.

[0064] Preferably, there are four liquid outlet holes 21.

[0065] For example, there are 4 liquid outlet holes 21 and 4 flow guide channels 111. Each flow guide channel 111 corresponds to one liquid outlet hole 21. In this way, the flushing liquid flows out through the shortest path and the flow efficiency is the highest.

[0066] In some embodiments, the effective axial engagement length of the guide spline 20 and the guide keyway 19 is not less than the maximum feed stroke of the inner drive spindle 13, so that the guide spline 20 and the guide keyway 19 always maintain circumferential transmission engagement during the entire process of the inner drive spindle 13 moving axially downward relative to the fixed nut 9.

[0067] In some embodiments, the angle of the guide tooth surface of the external retrieval thread 161 is 25° to 45°, for example, it can be 25°, 28°, 30°, 32°, 35°, 38°, 40°, 42°, 45°, etc. The bearing tooth surface angle of the external retrieval thread 161 is 5° to 15°, for example, it can be 5°, 6°, 8°, 10°, 12°, 14°, 15°, etc.; The pitch of the external retrieval thread 161 is 2.5mm to 4.2mm, for example, it can be 2.5mm, 2.8mm, 3mm, 3.2mm, 3.5mm, 3.8mm, 4mm, 4.2mm, etc.; When the deployable male cone 16 is in the undeployed state, the taper of the external retrieval thread 161 is 1:8 to 1:16, for example, it can be 1:8, 1:10, 1:12, 1:13, 1:15, 1:16, etc. It can be understood that this design allows the external retrieval thread 161 to easily screw into the inner wall of the fish 17, and also improves its anti-disengagement capability when lifting.

[0068] In some embodiments, the thread profile of the external retrieval thread 161 is any one of the following: trapezoidal thread profile, sawtooth thread profile, and barbed tension thread profile.

[0069] During the initial snap-fit ​​process, the drill pipe joint 2 rotates synchronously with the outer male cone body via the shearing pin 5 and the torque-transmitting and tension-bearing sleeve 7. After the snap-fit ​​torque reaches the set shearing torque, the shearing pin 5 cuts off, and the drill pipe joint 2 continues to rotate. It then drives the inner drive spindle 13 downward through the guide spline 20 and the feed thread pair 14, causing the internal elliptical expansion body 112 to push the deployable male cone body 16 radially outward. During the upward movement, the axial tension is transmitted to the fish landing 17 via the torque-transmitting and tension-bearing sleeve 7 and the outer male cone body. The inner drive spindle 13 is not in the main transmission path of the axial tension, thus realizing the sequential actions of external snap-fit, torque triggering, internal expansion, and external tension. This improves the anti-slip and anti-disengagement capabilities and load-bearing reliability of the retrieval connection. It also solves the problem that in the prior art, after the snap-fit ​​is completed, the contact area and thread penetration depth between the male cone and the inner wall of the fish landing 17 are difficult to continue to actively increase, leading to problems such as slippage and disengagement.

[0070] The basic concepts have been described above. Obviously, for those skilled in the art, the detailed disclosure above is merely illustrative and does not constitute a limitation of this application. Although not explicitly stated herein, those skilled in the art may make various modifications, improvements, and corrections to this application. Such modifications, improvements, and corrections are suggested in this application, and therefore remain within the spirit and scope of the exemplary embodiments of this application.

[0071] Furthermore, this application uses specific terms to describe embodiments of the application. For example, "an embodiment," "one embodiment," and / or "some embodiments" refer to a particular feature, structure, or characteristic associated with at least one embodiment of the application. Therefore, it should be emphasized and noted that "an embodiment," "one embodiment," or "an alternative embodiment" mentioned twice or more in different locations in this specification do not necessarily refer to the same embodiment. In addition, certain features, structures, or characteristics in one or more embodiments of the application can be appropriately combined.

Claims

1. A torque-triggered sequential drive internal expansion enhanced salvage male cone, characterized in that, include: The outer male cone body includes a male cone connector and an expandable male cone body connected to the male cone connector. The expandable male cone body is provided with an external retrieval thread on its outer periphery. An external rotary bearing drive mechanism includes a torque-transmitting bearing sleeve connected to the male conical joint. A drill pipe joint is provided inside the torque-transmitting bearing sleeve, and the drill pipe joint and the torque-transmitting bearing sleeve are locked by a shear pin. An internal rotary propulsion expansion mechanism is located inside the drill pipe joint and extends into the outer male cone body, used to drive the deployable male cone body to expand radially outward; The deployable male cone includes multiple male cone petals, and an axial opening groove is provided between two adjacent male cone petals; The internal rotary propulsion expansion mechanism includes a fixing nut located inside the male cone joint, which is fixedly connected to the male cone joint by screw a; it also includes an internal drive spindle, which is arranged along the central axis of the external male cone body. A guide keyway is provided in the lower part of the drill pipe joint, and the upper part of the internal drive spindle forms an axially sliding circumferential transmission engagement with the guide keyway through a guide spline; an external thread is provided on the outer periphery of the lower middle part of the internal drive spindle, and an internal thread is provided inside the fixing nut. The external thread and the internal thread engage to form a feed thread pair; an internal expansion section is provided at the end of the internal drive spindle away from the guide spline; The internal expansion section includes an elliptical expansion body, and multiple guide grooves are provided on the elliptical expansion body along the axial direction of the internal drive spindle. The inner drive spindle has an axially arranged liquid channel inside, and the inner drive spindle between the external thread and the elliptical expansion body has a plurality of liquid outlet holes communicating with the liquid channel. The effective axial engagement length of the guide spline and guide keyway is not less than the maximum feed stroke of the inner drive spindle, so that the guide spline and guide keyway always maintain circumferential transmission engagement during the entire process of the inner drive spindle moving axially downward relative to the fixed nut.

2. The torque-triggered sequential drive internal expansion enhanced salvage male cone according to claim 1, characterized in that, The drill pipe joint extends to the outer side of the torque-bearing sleeve away from the male cone joint. The external rotational tension drive mechanism also includes an upper cover a, which is sleeved on the drill pipe joint at the end of the torque-bearing sleeve. The upper cover a and the torque-bearing sleeve are fastened together by a plurality of upper cover screws.

3. The torque-triggered sequential drive internal expansion enhanced salvage male cone according to claim 1, characterized in that, A first bearing and a second bearing are provided between the drill pipe joint and the torsion-bearing sleeve. Along the axial direction of the drill pipe joint, the first bearing and the second bearing are respectively located on both sides of the shear pin.

4. The torque-triggered sequential drive internal expansion enhanced salvage male cone according to claim 3, characterized in that, A sealing ring is provided between the drill pipe joint on the side of the first bearing away from the second bearing and the torque-bearing sleeve.

5. The torque-triggered sequential drive internal expansion enhanced salvage male cone according to claim 1, characterized in that, The angle of the guide tooth surface of the external retrieval thread is 25° to 45°; The tension face angle of the external retrieval thread is 5° to 15°; The pitch of the external retrieval thread is 2.5mm to 4.2mm; When the deployable male cone is in the undeployed state, the taper of the external retrieval thread is 1:8 to 1:16.

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