Packer capable of effectively resetting anchoring and sealing mechanism after unsealing

Abstract

The invention relates to the technical field of petroleum and natural gas extraction, in particular to a packer capable of effectively resetting an anchoring mechanism and a sealing mechanism after deblocking, and aims to solve the problem of complex underground working conditions caused by the fact that the anchoring mechanism and the sealing mechanism cannot be reset during deblocking. The device comprises a central pipe, an anchoring mechanism and a sealing mechanism, wherein the anchoring mechanism and the sealing mechanism are arranged on the central pipe in a sleeving manner; the anchoring mechanism comprises an upper slip and a lower slip; the sealing mechanism comprises a rubber sleeve, an upper cone, a rubber sleeve sleeve and a lower cone; the upper cone is arranged below the upper slip and can move along the axis direction of the central pipe to push the upper slip to expand; the lower cone is arranged above the lower slip and can move in the axis direction of the central pipe so as to push the lower slip to expand. Reliable unblocking of the anchoring mechanism and reliable resetting of the rubber sleeve are achieved through relative movement of the upper cone, the lower cone, the upper slip and the lower slip, and underground complex working conditions caused by incapability of resetting are avoided.

Description

Technical Field

[0001] The invention relates to the technical field of oil and natural gas exploitation, and in particular to a packer with an anchoring and sealing mechanism effectively reset after unsealing. Background Art

[0002] During the construction of fracturing and acidizing, oil and gas wells often use packers for interlayer isolation. After the construction is completed, the packers need to be unsealed. During unsealing, the anchoring and sealing mechanisms cannot be reset, resulting in complex working conditions in the well. In severe cases, the oil and gas well will be directly scrapped. Summary of the invention

[0003] The object of the present invention is to provide a packer with an anchoring and sealing mechanism that can be effectively reset after unsealing, so as to solve the complex downhole working conditions caused by the inability to reset the anchoring mechanism and the sealing mechanism during unsealing.

[0004] In order to solve the above technical problems, the technical solution provided by the present invention is:

[0005] A packer with an anchoring and sealing mechanism that can be effectively reset after unsealing, comprising a center pipe, an anchoring mechanism and a sealing mechanism, wherein the anchoring mechanism and the sealing mechanism are sleeved on the center pipe; the anchoring mechanism comprises an upper slip and a lower slip, and the sealing mechanism comprises a rubber sleeve, an upper cone, a rubber sleeve sleeve and a lower cone; the upper cone is arranged below the upper slip and can move along the axial direction of the center pipe to push the upper slip to expand; the lower cone is arranged above the lower slip and can move along the axial direction of the center pipe 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 sleeve, and the rubber sleeve sleeve can move along the axial direction of the center pipe to squeeze the rubber sleeve.

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

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

[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 clamped in the annular groove; an internal thread is provided on the inner side of the C-shaped locking ring, and an external thread is provided on the piston, and the C-shaped locking ring is sleeved on the piston and connected to the piston thread.

[0009] Furthermore, the sealing mechanism also includes a first shear pin, which is inserted into the connecting sleeve and the piston. When the seal is set, 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 sleeved on and connected to the central tube, and the first C-shaped ring is arranged in the starting space.

[0011] Furthermore, the anchoring mechanism also includes a cone support ring and a second shear nail; one end of the upper cone away from the lower cone is inserted into the upper cava and is set as a petal claw, the cone support ring is sleeved on the center tube, and the second shear nail is inserted into the cone support ring and the upper cone at the same time; in the initial state, the cone support ring is inserted into the upper cone; when unsealed, the cone support ring is away from the upper cone and the second shear nail is cut off.

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

[0013] Furthermore, a first connecting hole is provided on the rubber sleeve, a second connecting hole is provided on the upper cone, the rubber sleeve is sleeved on the upper cone, the upper cone is sleeved on the center pipe and forms a balance space with the center pipe; 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 respectively connected with the upper annulus and the lower annulus to ensure the pressure balance at both ends of the rubber sleeve.

[0014] Furthermore, the anchoring mechanism also includes a lower cava cover and a third shear pin, the lower cava cover is sleeved on the central tube, the third shear pin is simultaneously inserted into the central tube and the lower cava cover, and the lower cava is installed on the lower cava cover; a cleaning hole is also provided on the central tube; in the initial state, the lower cava cover closes the cleaning hole; in the unsealed state, the cleaning hole is opened to flush the lower cava.

[0015] Based on the above technical solutions, the technical effects that can be achieved by the present invention are:

[0016] The packer provided by the present invention, which can effectively reset the anchoring and sealing mechanisms after unsealing, comprises a center pipe, an anchoring mechanism and a sealing mechanism, wherein the anchoring mechanism and the sealing mechanism are sleeved on the center pipe; the anchoring mechanism comprises an upper slip and a lower slip, and the sealing mechanism comprises a rubber sleeve, an upper cone, a rubber sleeve sleeve and a lower cone; the upper cone is arranged below the upper slip and can move along the axial direction of the center pipe to push the upper slip to expand; the lower cone is arranged above the lower slip and can move along the axial direction of the center pipe 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 sleeve, and the rubber sleeve sleeve can move along the axial direction of the center pipe to squeeze the rubber sleeve.

[0017] The packer provided by the present invention is anchored by inserting the upper and lower cones into the upper slips and the lower slips respectively, and compressing the rubber tube to expand the rubber tube for sealing. When unsealing, the upper and lower cones are moved along the axis of the central pipe to make the upper and lower slips lose their support and reset, and the rubber tube is not squeezed. The anchoring mechanism is reliably unsealed and the rubber tube is reliably reset by the relative movement of the upper and lower cones and the upper and lower slips, thereby avoiding complicated downhole working conditions caused by failure to reset. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] In order to more clearly illustrate the specific implementation methods of the present invention or the technical solutions in the prior art, the drawings required for use in the specific implementation methods or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are some implementation methods of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0019] Figure 1 A schematic diagram of the structure of the packer in the initial state in which the anchoring and sealing mechanisms are effectively reset after unsealing provided by an embodiment of the present invention;

[0020] Figure 2 A schematic diagram of the structure of a packer in a set state in which the anchoring and sealing mechanisms are effectively reset after unsealing provided by an embodiment of the present invention;

[0021] Figure 3 A schematic diagram of the structure of a packer in an unsealed state in which the anchoring and sealing mechanism are effectively reset after unsealing provided by an embodiment of the present invention;

[0022] Figure 4 Schematic diagram of the connection between the piston and the C-shaped locking ring.

[0023] Icons: 100-center pipe; 400-upper joint; 210-upper slip; 220-lower slip; 230-cone support ring; 240-second shear pin; 250-second C-shaped ring; 260-upper slip cover; 270-lower slip cover; 280-third C-shaped ring; 290-reset spring; 2110-third shear pin; 310-rubber cylinder; 320-upper cone; 330-rubber cylinder sleeve; 340-lower cone; 350-connecting sleeve; 360-piston; 370-C-shaped locking ring; 380-first shear pin; 390-first C-shaped ring; A-pressure transmission hole; B-starting space; C-first connecting hole; D-second connecting hole; E-balance space; F-upper annulus; G-lower annulus; H-cleaning hole. DETAILED DESCRIPTION

[0024] In order to make the purpose, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are part of the embodiments of the present invention, not all of the embodiments. Generally, the components of the embodiments of the present invention described and shown in the drawings here can be arranged and designed in various different configurations.

[0025] Therefore, the following detailed description of the embodiments of the present invention provided in the accompanying drawings is not intended to limit the scope of the invention claimed for protection, but merely represents selected embodiments of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0026] Some embodiments of the present invention are described in detail below in conjunction with the accompanying drawings. In the absence of conflict, the following embodiments and features in the embodiments can be combined with each other.

[0027] When the packer is released, the anchoring and sealing mechanisms may fail to reset, resulting in complex working conditions downhole. In severe cases, the oil and gas well may be directly scrapped.

[0028] In view of this, the present invention provides a packer with an anchoring and sealing mechanism that is effectively reset after unsealing, comprising a center pipe 100, an anchoring mechanism and a sealing mechanism, wherein the anchoring mechanism and the sealing mechanism are sleeved on the center pipe 100; the anchoring mechanism comprises an upper cava 210 and a lower cava 220, and the sealing mechanism comprises a rubber sleeve 310, an upper cone 320, a rubber sleeve sleeve 330 and a lower cone 340; the upper cone 320 is arranged below the upper cava 210 and can move along the axial direction of the center pipe 100 to push the upper cava 210 to expand; the lower cone 340 is arranged above the lower cava 220 and can move along the axial direction of the center pipe 100 to push the lower cava 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 sleeve 330, and the rubber sleeve sleeve 330 can move along the axial direction of the center pipe 100 to squeeze the rubber sleeve 310.

[0029] The packer provided by the present invention is anchored by inserting the upper cone 320 and the lower cone 340 into the upper slip 210 and the lower slip 220 respectively, and at the same time compressing the rubber cylinder 310 to expand the rubber cylinder 310 for sealing. When unsealing, the upper cone 320 and the lower cone 340 are moved along the axis direction of the central pipe 100 to make the upper slip 210 and the lower slip 220 lose support and reset, and the rubber cylinder 310 is not squeezed. The relative movement of the upper cone 320, the lower cone 340 and the upper slip 210 and the lower slip 220 realizes the reliable unlocking of the anchoring mechanism and the reliable reset of the rubber cylinder 310, avoiding the complex working conditions underground caused by the failure to reset.

[0030] The following combination Figure 1-Figure 4 The structure and shape of the packer provided in this embodiment for effectively resetting the anchoring and sealing mechanism after unsealing are described in detail:

[0031] The packer provided in this embodiment, which can effectively reset the anchoring and sealing mechanism after unsealing, comprises a central pipe 100, an anchoring mechanism, a sealing mechanism and an upper joint 400. Figure 1 As shown, the upper joint 400 is threadedly connected to the central pipe 100 for connecting a pipe string, and the anchoring mechanism and the sealing mechanism are both sleeved on the central pipe 100 .

[0032] In this embodiment, the anchoring mechanism includes an upper slip 210, a lower slip 220, a cone support ring 230, a second shear pin 240, a second C-shaped ring 250, an upper slip cover 260, a lower slip cover 270, a third C-shaped ring 280, a return spring 290, and a third shear pin 2110. Figure 1 As shown, the upper cava 210, the cone support ring 230, the second C-shaped ring 250 and the upper cava cover 260 are mounted on the central tube 100, the second C-shaped ring 250 is clamped on the central tube 100 and is arranged on the side of the cone support ring 230 close to the lower cone 340, and the upper cava 210 is installed on the upper cava cover 260; one end of the return spring 290 is connected to the upper cava 210, and the other end is connected to the upper cava cover 260, which is used to apply thrust to the upper cava 210 to move the upper cava 210 toward the central tube 100, thereby keeping the upper cava 210 in a retracted state. Similarly, the lower slip 220 and the lower slip cover 270 are both sleeved on the central tube 100, and the lower slip 220 is installed 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, which is used to apply thrust to the lower slip 220 to move the lower slip 220 toward the central tube 100, so that the lower slip 220 remains in a retracted state. The second shear nail 240 is inserted into the cone support ring 230 and the sealing mechanism at the same time to achieve the connection between the two; the third C-shaped ring 280 is sleeved on the central tube 100 and clamped with the central tube 100, and the third C-shaped ring 280 is arranged below the lower slip cover 270; the third shear nail 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. From the direction from the upper slip 210 to the lower slip 220, the upper cone 320, the rubber sleeve 310, the rubber sleeve 330, the connecting sleeve 350 and the lower cone 340 are sequentially mounted on the central pipe 100, as shown in FIG. Figure 1As shown. The rubber cylinder 310 is sleeved on the upper cone 320, and the upper cone 320 and the rubber cylinder sleeve 330 form an annular groove for installing the rubber cylinder 310; the end of the connecting sleeve 350 away from the rubber cylinder sleeve 330 is inserted into the lower cone 340 and is threadedly connected with the lower cone 340. The piston 360 is sleeved on the central tube 100 and connected to the rubber cylinder sleeve 330, and the lower cone 340 is sleeved on the piston 360; the central tube 100, the piston 360 and the lower cone 340 surround the starting space B, and 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.

[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 clamped 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 sleeved on the piston 360 and is threadedly connected with the piston 360. Specifically, as Figure 4 As shown, the thread teeth of the C-shaped locking ring 370 and the piston 360 are set to a right triangle, and the contact surfaces of the two are a horizontal plane and an inclined plane. Since the C-shaped locking ring 370 is a circular ring with a gap, when the piston 360 moves upward, the inclined plane is subjected to force, which can squeeze the C-shaped locking ring 370 to increase its diameter, so that the two move relative to each other. If the piston 360 moves downward relative to the C-shaped locking ring 370, since the horizontal plane is subjected to force, its force direction is parallel to the moving direction, and radial force cannot be applied, the C-shaped locking ring 370 cannot expand, so the piston 360 cannot move downward, that is, the two are one-way locked by the thread teeth of the right triangle.

[0035] In this embodiment, the first shear pin 380 is inserted into the connecting sleeve 350 and the piston 360. When 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 sleeved on the central tube 100 and connected to the central tube 100. The first C-shaped ring 390 is arranged in the starting space B.

[0036] In this embodiment, the end of the upper cone 320 away from the lower cone 340 is provided with a petal claw, which cuts the side wall along the axial direction to make it deformable to achieve expansion or contraction of the diameter. In the initial state, the end of the upper cone 320 away from the lower cone 340 is inserted into the upper slip 210, and the cone support ring 230 is inserted into the upper cone 320 to open the petal claw of the upper cone 320, thereby opening the upper slip 210. The second shear nail 240 is inserted into the cone support ring 230 and the upper cone 320 at the same time. 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 cava 210; when unsealed, the cone support ring 230 moves away from the upper cone 320 and cuts off the second shear nail 240, so that the petal claws retract, so that the upper cone 320 no longer supports the upper cava 210, and the upper cava 210 can be moved away from the inner wall of the wellbore under the thrust of the reset spring 290 to achieve unanchoring.

[0037] In order to realize the reliable reset of the sealing mechanism, a first connecting hole C is opened on the rubber sleeve 330, and a second connecting hole D is opened on the upper cone 320. The upper cone 320 is sleeved on the central pipe 100 and forms a balance space E with the central pipe 100. The annular space surrounded by the packer and the wellbore above the rubber sleeve 310 is the upper annulus F, and the annular space surrounded by the packer and the wellbore below the rubber sleeve 310 is the lower annulus G. Figure 2 As shown; in the unsealed state, the first connecting hole C, the second connecting hole D, and the balance space E are connected, as shown Figure 3 As shown, the balance space E and the first connecting hole C are respectively connected to the upper annulus F and the lower annulus G to ensure the pressure balance at both ends of the rubber cylinder 310.

[0038] In addition, to further ensure the resetting effect, a cleaning hole H is opened on the central pipe 100, one end of the cleaning hole H is connected to the interior of the central pipe 100, and the other end is connected to the lower annulus G, and is arranged as an inclined hole, and the inclined direction is arranged obliquely upward from the interior of the central pipe 100 to the lower annulus G, that is, the liquid inside the central pipe 100 is flushed obliquely upward through the cleaning hole H, and the liquid can enter the upper annulus F through the first connecting hole C, the second connecting hole D and the balance space E, thereby flushing foreign matter near the upper cava 210 and the lower cava 220, improving the resetting reliability, and avoiding jamming caused by foreign matter.

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

[0040] In the initial state, if 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 cava cover 270, the cone support ring 230 is inserted into the upper cone 320 to support the petal claws, and the upper cone 320 is inserted into the upper cava 210 to support the upper cava 210.

[0041] During sealing, the pipe column is pressurized, and liquid enters the central pipe 100 and enters the starting space B from the pressure transmission hole A. Under the action of liquid pressure, the piston 360 moves upward, and the lower cone 340, the connecting sleeve 350 and the C-shaped locking ring 370 move downward. At this time, the first shear pin 380 is sheared off, and the piston 360 pushes the rubber sleeve 330 to move upward and squeeze the rubber sleeve 310. At the same time, the rubber sleeve 310 pushes the upper cone 320 to move upward, so that the upper cone 320 is further inserted into the upper slip 210, thereby completing the expansion of the rubber sleeve 310 and the opening of the upper slip 210, and then completing the sealing and the anchoring of the upper slip 210; at the same time, the lower cone 340 is inserted downward into the lower slip 220 to open the lower slip 220, thereby completing the anchoring of the lower slip 220. At this time, the sealing state is reached, and the upper slip 210 and the lower slip 220 are both engaged with the inner wall of the wellbore, as shown in FIG. Figure 2 shown.

[0042] When unsealing, the tubing string is lifted, and the tubing string drives the upper joint 400 and the center pipe 100 to move upward, thereby cutting off the third shear nail 2110. At this time, the lower cava 220 and the lower cava cover 270 move downward under the action of gravity so that the lower cava 220 is pushed away from the inner wall of the wellbore by the return spring 290, thereby realizing the lock release; the first C-shaped ring 390 and the second C-shaped ring 250 move upward with the center pipe 100 at the same time. During the upward movement, the first C-shaped ring 390 abuts against the piston 360 to limit the piston 360, and then the connecting sleeve 350 and the lower cone 340 are limited by the piston 360 to prevent them from moving downward, so as to prevent the lower cone 340 from being reinserted into the lower cava 220, causing the lower cava 220 to bite the inner wall of the wellbore, thereby causing the unlocking failure. At the same time, as the center pipe 100 moves upward, the second C-shaped ring 250 abuts against the cone support ring 230, thereby cutting off the second shear nail 240. Subsequently, the cone support ring 230 moves upward with the center pipe 100 to separate from the upper cone 320. The petal claws of the upper cone 320 shrink due to the loss of support, thereby failing to support the upper slip 210. The upper slip 210 is pushed away from the inner wall of the wellbore by the return spring 290 to achieve lock release. Figure 3 In addition, as the central pipe 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 center tube 100 moves upward, the second C-shaped ring 250 first abuts against the cone support ring 230 to reset the upper slip 210, and at the same time, the end of the rubber cylinder 310 close to the upper slip 210 loses its limit. At this time, the rubber cylinder 310 is reset under its own elasticity and pushes the upper cone 320 to move upward. In addition, as the center tube 100 continues to move upward, the cone support ring 230 abuts against the upper slip 210 and can drive the upper slip 210 to move upward as the lock of the upper slip 210 is released, so that the upper slip 210 and the upper cone 320 maintain a certain distance, avoiding the reset of the rubber cylinder 310 causing the upper cone 320 to be reinserted into the upper slip 210, further ensuring the reliability of the lock release and the reliable reset of the rubber cylinder 310.

[0044] When unsealed, as the rubber cylinder 310 is reset, the rubber cylinder sleeve 330 and the upper cone 320 move relative to each other to connect 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, and then the upper annulus F and the lower annulus G are connected, so that the pressure at the upper and lower ends of the rubber cylinder 310 is balanced, which is conducive to the reset of the rubber cylinder 310. Figure 3 At the same time, the central tube 100 moves upward to disengage the cleaning hole H from the lower slip cover 270, and the cleaning hole H is opened. 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 enables it to maintain a threaded connection with the piston 360, avoiding the downward movement due to relative movement between the connecting sleeve 350 and the lower cone 340 and the piston 360, thereby ensuring that the lower cone 340 moves upward with the center tube 100.

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

[0047] After sealing, the upper slip 210 is supported by the petal claws of the upper cone 320. After unsealing, the petal claws of the upper cone 320 lose the support of the cone support ring 230. The petal claws lose their supporting effect on the upper slip 210 due to being in a free retracted state, which is beneficial to the resetting of the upper slip 210.

[0048] After the packer is unsealed, the second C-shaped ring 250 limits the upper slip 210, so that the upper slip 210 and the upper cone 320 are effectively separated, which can effectively avoid the upper slip 210 and the upper cone 320 from fitting together during the process of lifting the tubing, causing the tubing to be anchored and sealed again.

[0049] After unsealing, the first connecting hole C, the second connecting hole D and the balance space E are connected, so that the upper and lower pressures of the rubber cylinder 310 can be balanced, which is beneficial to the resetting of the rubber cylinder 310 .

[0050] After unsealing, the first C-shaped ring 390 limits the lower cone 340 by limiting the piston 360, so that the lower slip 220 is effectively separated from the lower cone 340, ensuring the reset of the lower slip 220 while effectively avoiding the lower slip 220 and the lower cone 340 from fitting together during the process of lifting the tubing, causing the tubing to be anchored and sealed again.

[0051] After unsealing, the cleaning hole H is opened to flush foreign matter near the lower slip 220 , and 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 resetting of the slip and the rubber cylinder 310 .

[0052] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit it. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or replace some or all of the technical features therein with equivalents. However, these modifications or replacements 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 resetting of anchoring and sealing mechanism after unsealing, characterized in that: It comprises a central tube (100), an anchoring mechanism and a sealing mechanism, wherein the anchoring mechanism and the sealing mechanism are sleeved on 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 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 pipe (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 pipe (100) to push the lower slip (220) to expand; One end of the rubber cylinder (310) abuts against the upper cone (320), and the other end abuts against the rubber cylinder sleeve (330). The rubber cylinder sleeve (330) can move along the axial direction of the central tube (100) to squeeze the rubber cylinder (310).

2. The packer with effective resetting of anchoring and sealing mechanism after unsealing according to claim 1, characterized in that: The sealing mechanism further comprises a connecting sleeve (350), wherein the connecting sleeve (350) is arranged at one end of the rubber sleeve sleeve (330) away from the rubber sleeve (310), and the end of the connecting sleeve (350) facing away from the rubber sleeve sleeve (330) is connected to the lower cone (340).

3. The packer with effective resetting of anchoring and sealing mechanism after unsealing according to claim 2, characterized in that: The sealing mechanism further comprises a piston (360), wherein the piston (360) is sleeved on the central tube (100) and connected to the rubber sleeve (330), and the lower cone (340) is sleeved on the piston (360); The central tube (100), the piston (360) and the lower cone (340) enclose a starting space (B); a pressure transmission hole (A) is provided on the side wall of the central tube (100); and two ends of the pressure transmission hole (A) are respectively connected to the starting space (B) and the central tube (100).

4. The packer with effective resetting of anchoring and sealing mechanism after unsealing according to claim 3, characterized in that: 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 with the annular groove; The inner side of the C-shaped locking ring (370) is provided with an internal thread, the piston (360) is provided with an external thread, and the C-shaped locking ring (370) is sleeved on the piston (360) and threadedly connected to the piston (360).

5. The packer with effective resetting of anchoring and sealing mechanism after unsealing according to claim 4, characterized in that: The sealing mechanism further comprises a first shear pin (380), wherein the first shear pin (380) is inserted into the connecting sleeve (350) and the piston (360). When the seal is set, the piston (360) drives the rubber sleeve (330) to move so as to squeeze the rubber sleeve (310) and shear off the first shear pin (380).

6. The packer with effective resetting of anchoring and sealing mechanism after unsealing according to claim 5, characterized in that: The sealing mechanism further comprises a first C-shaped ring (390), wherein the first C-shaped ring (390) is sleeved on the central tube (100) and connected to the central tube (100), and the first C-shaped ring (390) is arranged in the starting space (B).

7. The packer with effective resetting of anchoring and sealing mechanism after unsealing according to claim 6, characterized in that: The anchoring mechanism also includes a cone support ring (230) and a second shear pin (240); One end of the upper cone (320) away from the lower cone (340) is inserted into the upper slip (210) and is configured as a petal claw; the cone support ring (230) is sleeved on the central tube (100); and the second shear pin (240) is simultaneously inserted into the cone support ring (230) and the upper cone (320); In an 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).

8. The packer with effective resetting of anchoring and sealing mechanism after unsealing according to claim 7, characterized in that: The anchoring mechanism further comprises a second C-shaped ring (250), wherein the second C-shaped ring (250) is sleeved on the central tube (100) and connected to the central tube (100); The second C-shaped ring (250) is arranged on a side of the cone support ring (230) close to the lower cone (340).

9. The packer with effective resetting of anchoring and sealing mechanism after unsealing according to claim 8, characterized in that: The rubber sleeve (330) is provided with a first connecting hole (C), the upper cone (320) is provided with a second connecting hole (D), the rubber sleeve (330) is sleeved on the upper cone (320), the upper cone (320) is sleeved on the central tube (100) and forms a balance space (E) with the central tube (100); In the unsealed state, the first connecting hole (C), the second connecting hole (D), and the balance space (E) are connected; the annular space surrounded by the packer and the wellbore above the rubber cylinder (310) is the upper annulus (F), and the annular space surrounded by the packer and the wellbore below the rubber cylinder (310) is the lower annulus (G); the balance space (E) and the first connecting hole (C) are respectively connected to the upper annulus (F) and the lower annulus (G) to ensure the pressure balance at both ends of the rubber cylinder (310).

10. The packer with effective resetting of anchoring and sealing mechanism after unsealing according to claim 9, characterized in that: The anchoring mechanism further comprises a lower slip cover (270) and a third shear nail (2110), wherein the lower slip cover (270) is sleeved on the central pipe (100), the third shear nail (2110) is simultaneously inserted into the central pipe (100) and the lower slip cover (270), and 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 flush the lower slip (220).

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