A packer with effective repositioning of anchoring and sealing mechanisms after unsealing.

Abstract

This invention relates to the field of oil and gas extraction technology, and particularly to a packer that effectively resets the anchoring and sealing mechanisms after unsealing, aiming to solve the problem of complex downhole conditions caused by the inability of the anchoring and sealing mechanisms to reset during unsealing. The invention includes a central tube, an anchoring mechanism, and a sealing mechanism, which are fitted onto the central tube. The anchoring mechanism includes an upper slip and a lower slip, and the sealing mechanism includes a rubber sleeve, an upper cone, a rubber sleeve, and a lower cone. The upper cone is positioned below the upper slip and can move along the axis of the central tube to push the upper slip to expand; the lower cone is positioned above the lower slip and can move along the axis of the central tube to push the lower slip to expand. This invention achieves reliable unsealing of the anchoring mechanism and reliable reset of the rubber sleeve through the relative movement of the upper and lower cones with the upper and lower slips, avoiding complex downhole conditions caused by the inability to reset.

Description

Technical Field

[0001] This invention relates to the field of oil and gas extraction technology, and in particular to a packer that effectively resets the anchoring and sealing mechanism after unsealing. Background Technology

[0002] Packers are commonly used for interlayer isolation during fracturing, acidizing, and other operations in oil and gas wells. After the operations are completed, the packers need to be unsealed. However, during unsealing, the anchoring and sealing mechanisms may fail to reset, preventing the packers from being released. This can lead to complex downhole conditions and, in severe cases, directly cause the oil and gas well to become unusable. Summary of the Invention

[0003] The purpose of this invention is to provide a packer that effectively resets the anchoring and sealing mechanisms after unsealing, so as to solve the complex downhole working conditions caused by the inability of the anchoring and sealing mechanisms to reset during unsealing.

[0004] To solve the above-mentioned technical problems, the technical solution provided by the present invention is as follows:

[0005] A packer with effective repositioning of anchoring and sealing mechanisms after unsealing includes a central tube, an anchoring mechanism, and a sealing mechanism, wherein the anchoring mechanism and the sealing mechanism are fitted onto the central tube; the anchoring mechanism includes an upper slip and a lower slip, and the sealing mechanism includes a rubber sleeve, an upper cone, a rubber sleeve, and a lower cone; the upper cone is positioned below the upper slip and can move along the axial direction of the central tube to push the upper slip to expand; the lower cone is positioned above the lower slip and can move along the axial direction of the central tube to push the lower slip to expand; one end of the rubber sleeve abuts against the upper cone, and the other end abuts against the rubber sleeve, and the rubber sleeve can move along the axial direction of the central tube to squeeze the rubber sleeve.

[0006] Furthermore, the sealing mechanism also includes a connecting sleeve, which is located at the end of the rubber sleeve away from the rubber sleeve, and the end of the connecting sleeve opposite to the rubber sleeve is connected to the lower cone.

[0007] Furthermore, the sealing mechanism also includes a piston, which is fitted into the central tube and connected to the rubber sleeve, and a lower cone is fitted into the piston; the central tube, piston and lower cone form a starting space, and the side wall of the central tube is provided with a pressure transmission hole, the two ends of which are connected to the starting space and the central tube respectively.

[0008] Furthermore, the sealing mechanism also includes a C-shaped locking ring; the connecting sleeve and the lower cone form an annular groove, and the C-shaped locking ring is engaged in the annular groove; the inner side of the C-shaped locking ring is provided with an internal thread, the piston is provided with an external thread, and the C-shaped locking ring is fitted onto the piston and threadedly connected to the piston.

[0009] Furthermore, the sealing mechanism also includes a first shear pin, which is inserted into the connecting sleeve and the piston. During setting, the piston drives the rubber sleeve to move to squeeze the rubber sleeve and cut the first shear pin.

[0010] Furthermore, the sealing mechanism also includes a first C-shaped ring, which is fitted onto and connected to the central tube, and is located within the activation space.

[0011] Furthermore, the anchoring mechanism also includes a conical support ring and a second shear pin; the end of the upper cone away from the lower cone is inserted into the upper slip and configured as a split claw, the conical support ring is fitted onto the central tube, and the second shear pin is inserted into both the conical support ring and the upper cone; in the initial state, the conical support ring is inserted into the upper cone; when unsealed, the conical support ring moves away from the upper cone and cuts off the second shear pin.

[0012] Furthermore, the anchoring mechanism also includes a second C-shaped ring, which is fitted onto and connected to the central tube; the second C-shaped ring is located on the side of the cone support ring near the lower cone.

[0013] Furthermore, the rubber sleeve has a first connecting hole, and the upper cone has a second connecting hole. The rubber sleeve is fitted onto the upper cone, and the upper cone is fitted onto the central tube, forming a balance space with the central tube. In the unsealed state, the first connecting hole, the second connecting hole, and the balance space are connected. The annular space formed by the packer above the rubber sleeve and the wellbore is the upper annulus, and the annular space formed by the packer below the rubber sleeve and the wellbore is the lower annulus. The balance space and the first connecting hole are connected to the upper annulus and the lower annulus, respectively, to ensure pressure balance at both ends of the rubber sleeve.

[0014] Furthermore, the anchoring mechanism also includes a lower slip cover and a third shear pin. The lower slip cover is fitted onto the central tube, and the third shear pin is inserted into both the central tube and the lower slip cover. The lower slip is installed on the lower slip cover. A cleaning hole is also provided on the central tube. In the initial state, the lower slip cover closes the cleaning hole. In the unsealed state, the cleaning hole is opened to rinse the lower slip.

[0015] In summary, the technical effects achieved by this invention are as follows:

[0016] The packer provided by this invention, which effectively resets the anchoring and sealing mechanisms after unsealing, includes a central tube, an anchoring mechanism, and a sealing mechanism, with the anchoring and sealing mechanisms fitted onto the central tube. The anchoring mechanism includes an upper slip and a lower slip, and the sealing mechanism includes a rubber cylinder, an upper cone, a rubber cylinder sleeve, and a lower cone. The upper cone is positioned below the upper slip and can move along the axial direction of the central tube to push the upper slip to expand. The lower cone is positioned above the lower slip and can move along the axial direction of the central tube to push the lower slip to expand. One end of the rubber cylinder abuts against the upper cone, and the other end abuts against the rubber cylinder sleeve, which can move along the axial direction of the central tube to squeeze the rubber cylinder.

[0017] The packer provided by this invention achieves anchoring by inserting an upper cone and a lower cone into upper and lower slips, respectively, while simultaneously compressing the rubber sleeve to expand it for sealing. During unsealing, moving the upper and lower cones along the central tube axis causes the upper and lower slips to lose support and reset, while the rubber sleeve is no longer compressed. The relative movement of the upper and lower cones with the upper and lower slips ensures reliable unsealing of the anchoring mechanism and reliable reset of the rubber sleeve, avoiding complex downhole conditions caused by failure to reset. Attached Figure Description

[0018] To more clearly illustrate the specific embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the specific embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of the present invention. For those skilled in the art, other drawings can be obtained from these drawings without creative effort.

[0019] Figure 1 This is a schematic diagram of the packer in its initial state after the unsealing and effective reset of the anchoring and sealing mechanism, as provided in an embodiment of the present invention.

[0020] Figure 2 This is a schematic diagram of the packer in the setting state after the unsealing and effective reset of the anchoring and sealing mechanism, as provided in an embodiment of the present invention.

[0021] Figure 3 This is a schematic diagram of the packer in the unsealed state, where the anchoring and sealing mechanisms are effectively reset after unsealing, as provided in an embodiment of the present invention.

[0022] Figure 4 This is a schematic diagram showing the connection between the piston and the C-shaped locking ring.

[0023] Icons: 100-Center tube; 400-Upper connector; 210-Upper slip; 220-Lower slip; 230-Conical support ring; 240-Second shear pin; 250-Second C-ring; 260-Upper slip cover; 270-Lower slip cover; 280-Third C-ring; 290-Reset spring; 2110-Third shear pin; 310-Glue sleeve; 320-Upper cone; 330-Glue sleeve; 340-Lower cone; 350-Connecting sleeve; 360-Piston; 370-C-locking ring; 380-First shear pin; 390-First C-ring; A-Pressure transmission hole; B-Starting space; C-First connecting hole; D-Second connecting hole; E-Balance space; F-Upper annular cavity; G-Lower annular cavity; H-Cleaning hole. Detailed Implementation

[0024] 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.

[0025] 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.

[0026] The following detailed description of some embodiments of the present invention is provided in conjunction with the accompanying drawings. Unless otherwise specified, the following embodiments and features can be combined with each other.

[0027] When a packer is unsealed, it may fail to unseal due to the anchoring and sealing mechanisms being unable to reset, resulting in complex working conditions downhole and, in severe cases, directly leading to the abandonment of the oil and gas well.

[0028] In view of this, the present invention provides a packer that effectively resets the anchoring and sealing mechanisms after unsealing, comprising a central tube 100, an anchoring mechanism, and a sealing mechanism, wherein the anchoring mechanism and the sealing mechanism are fitted onto the central tube 100; the anchoring mechanism comprises an upper slip 210 and a lower slip 220, and the sealing mechanism comprises a rubber sleeve 310, an upper cone 320, a rubber sleeve 330, and a lower cone 340; the upper cone 320 is disposed below the upper slip 210 and can move along the axial direction of the central tube 100 to push the upper slip 210 to expand; the lower cone 340 is disposed above the lower slip 220 and can move along the axial direction of the central tube 100 to push the lower slip 220 to expand; one end of the rubber sleeve 310 abuts against the upper cone 320, and the other end abuts against the rubber sleeve 330, and the rubber sleeve 330 can move along the axial direction of the central tube 100 to squeeze the rubber sleeve 310.

[0029] The packer provided by this invention achieves anchoring by inserting the upper cone 320 and lower cone 340 into the upper slip 210 and lower slip 220 respectively, while simultaneously compressing the rubber sleeve 310 to expand it for sealing. During unsealing, moving the upper cone 320 and lower cone 340 along the axis of the central tube 100 causes the upper slip 210 and lower slip 220 to lose support and reset, while the rubber sleeve 310 is no longer compressed. The relative movement of the upper cone 320, lower cone 340 with the upper slip 210, lower slip 220 ensures reliable unlocking of the anchoring mechanism and reliable reset of the rubber sleeve 310, avoiding complex downhole conditions caused by failure to reset.

[0030] The following combination Figures 1-4 The structure and shape of the packer with effective reset of the anchoring and sealing mechanism after unsealing, as provided in this embodiment, are described in detail below:

[0031] The packer provided in this embodiment, which effectively resets the anchoring and sealing mechanisms after unsealing, includes a central tube 100, an anchoring mechanism, a sealing mechanism, and an upper connector 400. Figure 1 As shown, the upper connector 400 is threadedly connected to the central tube 100 and is used to connect the tube string. The anchoring mechanism and the sealing mechanism are both fitted onto the central tube 100.

[0032] In this embodiment, the anchoring mechanism includes an upper slip 210, a lower slip 220, a conical support ring 230, a second shear pin 240, a second C-ring 250, an upper slip cover 260, a lower slip cover 270, a third C-ring 280, a return spring 290, and a third shear pin 2110. Figure 1 As shown, the upper slip 210, the conical support ring 230, the second C-shaped ring 250, and the upper slip cover 260 are fitted onto the central tube 100. The second C-shaped ring 250 is engaged with the central tube 100 and positioned on the side of the conical support ring 230 near the lower cone 340. The upper slip 210 is mounted on the upper slip cover 260. One end of the return spring 290 is connected to the upper slip 210, and the other end is connected to the upper slip cover 260. It is used to apply a pushing force to the upper slip 210 to move the upper slip 210 toward the central tube 100, thereby keeping the upper slip 210 in a retracted state. Similarly, both the lower slip 220 and the lower slip cover 270 are fitted onto the central tube 100, with the lower slip 220 mounted on the lower slip cover 270. One end of the return spring 290 is connected to the lower slip 220, and the other end is connected to the lower slip cover 270, used to apply a pushing force to the lower slip 220 to move it towards the central tube 100, thereby keeping the lower slip 220 in a retracted state. The second shear pin 240 is simultaneously inserted into the conical support ring 230 and the sealing mechanism to connect them. The third C-ring 280 is fitted onto the central tube 100 and engages with it, while also being positioned below the lower slip cover 270. The third shear pin 2110 is inserted into the lower slip cover 270 and the central tube 100 to fix the lower slip cover 270 to the central tube 100.

[0033] In this embodiment, the sealing mechanism includes a rubber sleeve 310, an upper cone 320, a rubber sleeve 330, a lower cone 340, a connecting sleeve 350, a piston 360, a C-shaped locking ring 370, a first shear pin 380, and a first C-shaped ring 390. Along the direction from the upper slip 210 to the lower slip 220, the upper cone 320, rubber sleeve 310, rubber sleeve 330, connecting sleeve 350, and lower cone 340 are sequentially fitted onto the central tube 100, as shown below. Figure 1As shown. The rubber sleeve 310 is fitted onto the upper cone 320, and the upper cone 320 and the rubber sleeve 330 form an annular groove for installing the rubber sleeve 310. The end of the connecting sleeve 350 away from the rubber sleeve 330 is inserted into the lower cone 340 and threadedly connected to it. The piston 360 is fitted onto the central tube 100 and connected to the rubber sleeve 330, and the lower cone 340 is fitted onto the piston 360. The central tube 100, piston 360, and lower cone 340 form a starting space B. The side wall of the central tube 100 is provided with a pressure transmission hole A, and both ends of the pressure transmission hole A are connected to the starting space B and the central tube 100, respectively.

[0034] In this embodiment, the connecting sleeve 350 and the lower cone 340 form an annular groove, and the C-shaped locking ring 370 is engaged in the annular groove; the inner side of the C-shaped locking ring 370 is provided with an internal thread, and the piston 360 is provided with an external thread. The C-shaped locking ring 370 is fitted onto the piston 360 and threadedly connected to the piston 360. Specifically, as shown... Figure 4 As shown, the threaded teeth of the C-shaped locking ring 370 and the piston 360 are set as right-angled triangles, and their contact surfaces are a horizontal plane and an inclined plane. Since the C-shaped locking ring 370 is a notched ring, when the piston 360 moves upward, the inclined plane is subjected to force, which can compress the C-shaped locking ring 370 to increase its diameter, thereby causing relative movement between the two. When the piston 360 moves downward relative to the C-shaped locking ring 370, due to the force on the horizontal plane, the direction of the force is parallel to the direction of movement, and no radial force can be applied. The C-shaped locking ring 370 cannot expand, so the piston 360 cannot move downward. That is, the two achieve unidirectional locking through the right-angled triangular threaded teeth.

[0035] In this embodiment, the first shear pin 380 is inserted into the connecting sleeve 350 and the piston 360. During setting, the piston 360 drives the rubber sleeve 330 to move to squeeze the rubber sleeve 310 and cut the first shear pin 380. The first C-shaped ring 390 is fitted onto the central tube 100 and connected to the central tube 100. The first C-shaped ring 390 is disposed in the starting space B.

[0036] In this embodiment, the end of the upper cone 320 away from the lower cone 340 is configured as a split claw. The split claw cuts the sidewall along the axial direction, giving it deformability to expand or contract its diameter. Initially, the end of the upper cone 320 away from the lower cone 340 is inserted into the upper clamp 210, and the cone support ring 230 is inserted into the upper cone 320 to open the split claw of the upper cone 320, thereby opening the upper clamp 210. The second shear pin 240 is simultaneously inserted into both the cone support ring 230 and the upper cone 320. In the initial state, the cone support ring 230 is inserted into the upper cone 320 so that the upper cone 320 supports the upper slip 210; when unsealed, the cone support ring 230 moves away from the upper cone 320 and cuts the second shear pin 240, causing the split claw to retract, so that the upper cone 320 no longer supports the upper slip 210, and the upper slip 210 can move away from the inner wall of the wellbore under the thrust of the return spring 290 to achieve the release of anchoring.

[0037] To ensure reliable resetting of the sealing mechanism, a first connecting hole C is provided on the rubber sleeve 330, and a second connecting hole D is provided on the upper cone 320. The upper cone 320 is fitted onto the central tube 100, forming a balance space E with the central tube 100. The annular space formed by the packer above the rubber sleeve 310 and the wellbore is called the upper annular space F, and the annular space formed by the packer below the rubber sleeve 310 and the wellbore is called the lower annular space G. Figure 2 As shown; in the unsealed state, the first connecting hole C, the second connecting hole D, and the equilibrium space E are connected, as shown. Figure 3 As shown, the balance space E and the first connecting hole C are connected to the upper annular space F and the lower annular space G, respectively, to ensure the pressure balance at both ends of the rubber sleeve 310.

[0038] In addition, to further ensure the reset effect, a cleaning hole H is opened on the central tube 100. One end of the cleaning hole H is connected to the inside of the central tube 100, and the other end is connected to the lower annular space G. It is set as an oblique hole, with the oblique direction being obliquely upward from the inside of the central tube 100 to the lower annular space G. That is, the liquid inside the central tube 100 is flushed obliquely upward through the cleaning hole H, and the liquid can enter the upper annular space F through the first connecting hole C, the second connecting hole D and the balance space E, thereby flushing the foreign objects near the upper slip 210 and the lower slip 220, improving the reset reliability and avoiding jamming caused by foreign objects.

[0039] The working process of the packer with effective reset of the anchoring and sealing mechanism after unsealing, as provided in this embodiment, is as follows:

[0040] In the initial state, such as Figure 1 As shown, the first connecting hole C, the second connecting hole D, and the balance space E are connected. The cleaning hole H is closed by the lower slip cover 270. The cone support ring 230 is inserted into the upper cone 320 to support the split claw. The upper cone 320 is inserted into the upper slip 210 to support the upper slip 210.

[0041] During setting, the tubing string is pressurized, and liquid enters the central tube 100 and then from the pressure transmission port A into the starting space B. Under the liquid pressure, the piston 360 moves upward, while the lower cone 340, connecting sleeve 350, and C-shaped locking ring 370 move downward. At this time, the first shear pin 380 is sheared, and the piston 360 pushes the rubber sleeve 330 upward and squeezes the rubber sleeve 310. Simultaneously, the rubber sleeve 310 pushes the upper cone 320 upward, causing the upper cone 320 to further insert into the upper slip 210, thereby completing the expansion of the rubber sleeve 310 and the opening of the upper slip 210, thus completing the sealing and anchoring of the upper slip 210. At the same time, the lower cone 340 inserts downward into the lower slip 220 to open it, thereby completing the anchoring of the lower slip 220. At this point, the setting state is achieved, and both the upper slip 210 and the lower slip 220 are engaged with the inner wall of the wellbore. Figure 2 As shown.

[0042] During unlocking, the tubing string is lifted, causing the upper connector 400 and the central tube 100 to move upward, thereby cutting the third shear pin 2110. At this time, the lower slip 220 and the lower slip cover 270 move downward under the action of gravity, so that the lower slip 220 moves away from the inner wall of the wellbore under the push of the return spring 290, thereby realizing the locking release. The first C-ring 390 and the second C-ring 250 move upward with the central tube 100 at the same time. During the upward movement, the first C-ring 390 abuts against the piston 360, thereby limiting the piston 360. In turn, the piston 360 limits the connecting sleeve 350 and the lower cone 340 to prevent them from moving downward, so as to prevent the lower cone 340 from re-inserting into the lower slip 220, causing the lower slip 220 to bite against the inner wall of the wellbore, thus leading to unlocking failure. Simultaneously, as the central tube 100 moves upward, the second C-shaped ring 250 abuts against the conical support ring 230, thereby causing the second shear pin 240 to shear off. Subsequently, the conical support ring 230 moves upward with the central tube 100 to disengage from the upper cone 320. The split claws of the upper cone 320 retract due to loss of support, thus failing to support the upper slip 210. Under the push of the return spring 290, the upper slip 210 moves away from the inner wall of the wellbore to achieve lock release. Figure 3 As shown. In addition, as the central tube 100 moves upward, the third C-shaped ring 280 abuts against the lower slip cover 270 to prevent parts from falling off.

[0043] It should be noted that as the central tube 100 moves upward, the second C-shaped ring 250 first abuts against the cone support ring 230 to reset the upper slip 210. Simultaneously, the end of the rubber sleeve 310 near the upper slip 210 loses its limiting position. At this point, the rubber sleeve 310 resets under its own elasticity and pushes the upper cone 320 upward. Furthermore, as the central tube 100 continues to move upward, the cone support ring 230 abuts against the upper slip 210. With the release of the upper slip 210's lock, it can drive the upper slip 210 upward, maintaining a certain distance between the upper slip 210 and the upper cone 320. This prevents the upper cone 320 from re-inserting into the upper slip 210 due to the reset of the rubber sleeve 310, further ensuring the reliability of the lock release and the reliable reset of the rubber sleeve 310.

[0044] Upon unsealing, as the rubber sleeve 310 resets, the rubber sleeve 330 and the upper cone 320 move relative to each other, connecting the first connecting hole C and the second connecting hole D. At this time, the first connecting hole C, the second connecting hole D, and the balance space E are connected, thereby connecting the upper annular space F and the lower annular space G, balancing the pressure at both ends of the rubber sleeve 310, which facilitates the reset of the rubber sleeve 310. Figure 3 As shown. At the same time, the central tube 100 moves upward, causing the cleaning hole H to disengage from the lower slip cover 270, the cleaning hole H opens, and the liquid in the central tube 100 is sprayed out through the cleaning hole H to clean the lower slip 220. At the same time, the liquid can reach the upper slip 210 through the first connecting hole C, the second connecting hole D and the balance space E to clean the upper slip 210.

[0045] It should be noted that the elasticity of the C-shaped locking ring 370 keeps it in a threaded connection with the piston 360, preventing it from moving downwards due to relative movement between the connecting sleeve 350 and the lower cone 340 and the piston 360 caused by the weight of the connecting sleeve 350 and the lower cone 340. This ensures that the lower cone 340 moves upwards with the central tube 100.

[0046] In summary, the packer provided in this embodiment has the following advantages:

[0047] After setting, the upper slip 210 is supported by the split claw of the upper cone 320. After unsealing, the split claw of the upper cone 320 loses the support of the cone support ring 230. The split claw loses its supporting effect on the upper slip 210 because it is in a free retraction state, which is conducive to the reset of the upper slip 210.

[0048] After the packer is released, the second C-ring 250 limits the upper slip 210, so that the upper slip 210 and the upper cone 320 are effectively separated. While ensuring the upper slip 210 is reset, it can effectively prevent the upper slip 210 from sticking to the upper cone 320 during the process of lifting the tubing string, which would cause the tubing string to re-anchor and set.

[0049] After unsealing, the first connecting hole C, the second connecting hole D, and the balance space E are connected, which can realize the pressure balance between the upper and lower parts of the rubber sleeve 310 and facilitate the reset of the rubber sleeve 310.

[0050] After unsealing, the first C-ring 390 limits the lower cone 340 by limiting the piston 360, so that the lower slip 220 and the lower cone 340 are effectively separated. This ensures that the lower slip 220 is reset, and during the process of lifting the tubing string, it can effectively prevent the lower slip 220 and the lower cone 340 from sticking together and causing the tubing string to re-anchor and set.

[0051] After unsealing, the cleaning hole H is opened, which can flush away foreign objects near the lower slip 220. At the same time, the liquid can flush the upper slip 210 through the first connecting hole C, the second connecting hole D and the balance space E, thereby ensuring the effective reset of the slip and the rubber sleeve 310.

[0052] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, and not to limit them; although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some or all of the technical features; and these modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of the present invention.

Claims

1. A packer with effective reset of the anchoring and sealing mechanism after unsealing, characterized in that, It includes a central tube (100), an anchoring mechanism, and a sealing mechanism, wherein the anchoring mechanism and the sealing mechanism are fitted onto the central tube (100); The anchoring mechanism includes an upper slip (210) and a lower slip (220), and the sealing mechanism includes a rubber sleeve (310), an upper cone (320), a rubber sleeve (330), and a lower cone (340); The upper cone (320) is disposed below the upper slip (210) and can move along the axial direction of the central tube (100) to push the upper slip (210) to expand; The lower cone (340) is positioned above the lower slip (220) and can move along the axial direction of the central tube (100) to push the lower slip (220) to expand; One end of the rubber tube (310) abuts against the upper cone (320), and the other end abuts against the rubber tube sleeve (330). The rubber tube sleeve (330) can move along the axial direction of the central tube (100) to squeeze the rubber tube (310). The sealing mechanism further includes a connecting sleeve (350), which is disposed at the end of the rubber sleeve (330) away from the rubber sleeve (310), and the end of the connecting sleeve (350) opposite to the rubber sleeve (330) is connected to the lower cone (340); The sealing mechanism further includes a piston (360), which is fitted onto the central tube (100) and connected to the rubber sleeve (330), and the lower cone (340) is fitted onto the piston (360); The central tube (100), the piston (360), and the lower cone (340) form a starting space (B). The side wall of the central tube (100) is provided with a pressure transmission hole (A), and the two ends of the pressure transmission hole (A) are respectively connected to the starting space (B) and the central tube (100). The sealing mechanism also includes a C-shaped locking ring (370); The connecting sleeve (350) and the lower cone (340) form an annular groove, and the C-shaped locking ring (370) is engaged in the annular groove; The C-shaped locking ring (370) has an internal thread on its inner side, and the piston (360) has an external thread. The C-shaped locking ring (370) is fitted onto the piston (360) and is threadedly connected to the piston (360). The threads of the C-shaped locking ring (370) and the piston (360) are set as right-angled triangles, and their contact surfaces are a horizontal plane and an inclined plane. Since the C-shaped locking ring (370) is a notched ring, when the piston (360) moves upward, the inclined plane is subjected to force, which can squeeze the C-shaped locking ring (370) to make its diameter larger, thereby causing the two to move relative to each other. When the piston (360) moves downward relative to the C-shaped locking ring (370), the horizontal plane is subjected to force, and its force direction is parallel to the movement direction, so it cannot apply radial force. The C-shaped locking ring (370) cannot expand, so the piston (360) cannot move downward. That is, the two achieve unidirectional locking through the threads of the right-angled triangles. The elasticity of the C-shaped locking ring (370) keeps it in a threaded connection with the piston (360), preventing the lower cone (340) from moving relative to the piston (360) due to the weight of the connecting sleeve (350) and the lower cone (340), thus ensuring that the lower cone (340) moves upward with the central tube (100).

2. The packer with effective reset of the anchoring and sealing mechanism after unsealing according to claim 1, characterized in that, The sealing mechanism further includes a first shear pin (380), which is inserted into the connecting sleeve (350) and the piston (360). During setting, the piston (360) drives the rubber sleeve (330) to move to squeeze the rubber sleeve (310) and cut the first shear pin (380).

3. The packer with effective reset of the anchoring and sealing mechanism after unsealing according to claim 2, characterized in that, The sealing mechanism further includes a first C-shaped ring (390), which is fitted onto the central tube (100) and connected to the central tube (100). The first C-shaped ring (390) is disposed within the starting space (B).

4. The packer with effective reset of the anchoring and sealing mechanism after unsealing according to claim 3, characterized in that, The anchoring mechanism further includes a conical support ring (230) and a second shear pin (240); The upper cone (320) is inserted into the upper slip (210) at one end away from the lower cone (340) and is configured as a split claw. The cone support ring (230) is fitted onto the central tube (100). The second shear pin (240) is inserted into both the cone support ring (230) and the upper cone (320). In the initial state, the cone support ring (230) is inserted into the upper cone (320); when unsealed, the cone support ring (230) moves away from the upper cone (320) and cuts off the second shear pin (240).

5. The packer with effective reset of the anchoring and sealing mechanism after unsealing according to claim 4, characterized in that, The anchoring mechanism further includes a second C-shaped ring (250), which is fitted onto the central tube (100) and connected to the central tube (100); The second C-shaped ring (250) is disposed on the side of the cone support ring (230) near the lower cone (340).

6. The packer with effective reset of the anchoring and sealing mechanism after unsealing according to claim 5, characterized in that, The rubber sleeve (330) has a first connecting hole (C), and the upper cone (320) has a second connecting hole (D). The rubber sleeve (330) is fitted onto the upper cone (320), and the upper cone (320) is fitted onto the central tube (100) and together with the central tube (100) forms a balance space (E). In the unsealed state, the first connecting hole (C), the second connecting hole (D), and the balance space (E) are connected; the annular space formed by the packer and the wellbore above the rubber tube (310) is called the upper annular space (F), and the annular space formed by the packer and the wellbore below the rubber tube (310) is called the lower annular space (G). The balance space (E) and the first connecting hole (C) are connected to the upper annular space (F) and the lower annular space (G) respectively to ensure the pressure balance at both ends of the rubber tube (310).

7. The packer with effective reset of the anchoring and sealing mechanism after unsealing according to claim 6, characterized in that, The anchoring mechanism further includes a lower slip cover (270) and a third shear pin (2110). The lower slip cover (270) is fitted onto the central tube (100). The third shear pin (2110) is inserted into both the central tube (100) and the lower slip cover (270). The lower slip (220) is installed on the lower slip cover (270). The central tube (100) is also provided with a cleaning hole (H); In the initial state, the lower slip cover (270) closes the cleaning hole (H); in the unsealed state, the cleaning hole (H) is opened to rinse the lower slip (220).

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