Packer setting tool

Abstract

The application relates to a packer setting tool, which comprises a mandrel, a supporting sleeve connected to the outer part of the mandrel through a first connecting structure, a first limiting step arranged on the mandrel and used for limiting the upward movement of the supporting sleeve, a closed disengaging cavity arranged between the mandrel and the supporting sleeve, a pressure transmission hole arranged on the mandrel and used for communicating with the disengaging cavity, and the first connecting structure can be cut under the pressure of the medium in the disengaging cavity; a diameter reducing structure is arranged on the outer part of the supporting sleeve and used for being connected with the packer, a first limiting structure is fixedly connected to the mandrel and used for limiting the downward movement distance of the supporting sleeve, and when the supporting sleeve moves downward to the first limiting structure, the diameter of the diameter reducing structure is reduced so that the diameter reducing structure can be separated from the packer. The application can realize the purpose of lowering the packer through the setting tool; and the application can ensure the smooth disengagement of the packer and improve the effectiveness of the disengagement.

Description

Packer setting tool Technical Field

[0001] This invention belongs to the field of packer setting technology, and specifically relates to a packer setting tool. Background Technology

[0002] The insertion and release of the reconnection packer are usually achieved by a setting tool. After the packer is released from its setting action, the setting tool can be re-inserted into a positioning and sealing device to reconnect the packer to the lower production tubing.

[0003] The release of the packer setting tool is usually done mechanically or hydraulically. Regardless of the method, it is difficult to guarantee a 100% successful release, and failure to release successfully will have a significant impact on subsequent production. Summary of the Invention

[0004] In order to solve all or part of the above problems, the present invention aims to provide a packer setting tool, which, through the connection of a reduced diameter structure with the packer, enables the packer to be lowered into the setting tool, and the reduced diameter structure enables the packer to be released by reducing its diameter, thus ensuring the smooth release of the packer from the setting tool.

[0005] According to one aspect of the present invention, a packer setting tool is provided, comprising a mandrel, wherein a flow channel extending from top to bottom through the mandrel is formed on the mandrel, a support sleeve is connected to the outside of the mandrel via a first connecting structure, a first limiting step is provided on the mandrel to restrict the upward movement of the support sleeve, a closed release cavity is provided in the region between the mandrel and the support sleeve, and a pressure transmitting hole communicating with the release cavity is formed on the mandrel, wherein the first connecting structure can be sheared by the pressure of the medium in the release cavity;

[0006] The support sleeve is fitted with a diameter reduction structure, which is used to connect with the packer. A first limiting structure is fixedly connected to the spindle. The diameter reduction structure is fixedly connected to the first limiting structure. The first limiting structure is used to limit the downward movement of the support sleeve. When the support sleeve moves down to the first limiting structure, the diameter of the diameter reduction structure is reduced so that the diameter reduction structure can disengage from the packer.

[0007] A sealing assembly is fixedly and sealed below the first limiting structure, and the sealing assembly is used to seal the annular space between the mandrel and the packer.

[0008] Furthermore, the reduced diameter structure includes a claw sleeve that is fixedly connected to the first limiting structure and sleeved outside the support sleeve. The claw sleeve has an installation hole, and a connecting claw is provided in the installation hole. The connecting claw is pressed onto the support sleeve by a pressing structure.

[0009] The outer wall of the support sleeve is provided with a plurality of annular grooves, and a protrusion is provided between two adjacent annular grooves. The inner wall of the connecting claw is fixedly connected with a plurality of mating teeth. When the mating teeth are located on the protrusion, the connecting claw can connect with the packer. When the support sleeve moves down to the first limiting structure, each of the mating teeth is located in the corresponding annular groove.

[0010] Furthermore, the pressing structure is a pressing strip, one end of which is fixedly connected to the support sleeve. A clearance groove is provided on the inner wall of the connecting claw, and a pressing block is provided in the clearance groove. The pressing block is fixedly connected to the connecting claw, and the other end of the pressing strip passes through the clearance groove and presses on the pressing block.

[0011] Furthermore, the outer wall of the connecting claw is provided with an external thread structure, and the connecting claw is connected to the packer through the external thread structure; there are several mounting holes, and each mounting hole is provided with a connecting claw; the first connecting structure is a first shear pin; a first sealing structure is provided between the mandrel and the support sleeve on both sides of the pressure transmission hole, and when the support sleeve moves down to the first limiting structure, the two first sealing structures are still located on both sides of the pressure transmission hole.

[0012] Furthermore, the first limiting structure is a limiting joint, which is sleeved on the mandrel and is fixedly and sealed to the mandrel, and is also fixedly connected to the claw sleeve.

[0013] Furthermore, the sealing assembly includes an inner support shaft that is fixedly and sealingly connected to the limiting joint, and a sealing element is sleeved on the inner support shaft. The sealing element is used to seal the annular space between the inner support shaft and the packer. A guide shoe is fixedly and sealingly connected to the lower end of the inner support shaft, and the lower end of the guide shoe is provided with an inclined surface.

[0014] Furthermore, a torque transmission structure is connected to the mandrel, the torque transmission structure is located above the support sleeve, the torque transmission structure is used to connect with the packer to transmit torque to the packer, and the torque transmission structure can be disconnected from the packer.

[0015] Furthermore, the torque transmission structure includes a release sleeve, the lower end of which is provided with an insert finger that engages with a slot on the packer so that torque can be transmitted to the packer through the release sleeve.

[0016] The release sleeve is fixedly connected to the mandrel via a second connecting structure. A sealed release cavity is provided between the release sleeve and the mandrel. A slot is provided on the mandrel that communicates with the release cavity. The second connecting structure can be sheared by the pressure of the medium in the release cavity. When the second connecting structure is sheared, the pressure in the release cavity is less than the pressure in the release cavity when the first connecting structure is sheared.

[0017] The mandrel is provided with a second limiting step to restrict the downward movement of the release sleeve. The mandrel above the release sleeve is connected to a second limiting structure. The second limiting structure is used to limit the upward movement of the release sleeve. When the release sleeve moves upward to the second limiting structure, the insert finger disengages from the slot on the packer.

[0018] Furthermore, an upper sleeve is fixedly connected above the release sleeve, and the upper sleeve is fitted onto the mandrel. The second limiting structure includes an elastic ring disposed between the upper sleeve and the release sleeve. A limiting hole is provided on the mandrel above the elastic ring to cooperate with the elastic ring. When the release sleeve moves upward to the point where the elastic ring is located in the limiting hole, the elastic ring opens up and gets stuck between the limiting hole and the release sleeve, preventing the release sleeve from moving upward.

[0019] Furthermore, a second sealing structure is provided between the release sleeve and the mandrel on both sides of the slot. When the release sleeve moves upward until the elastic ring is located in the limiting hole, the two second sealing structures are still located on both sides of the slot. A limiting sleeve is sleeved on the mandrel. The limiting sleeve is located above the upper sleeve. When the release sleeve moves upward until the elastic ring is located in the limiting hole, the upper sleeve contacts the limiting sleeve. The second connecting structure is a second shear pin.

[0020] As can be seen from the above technical solution, the packer setting tool provided by the present invention has the following beneficial effects:

[0021] The setting tool of the present invention, through the connection of the reducing structure with the packer, can achieve the purpose of lowering the setting tool into the packer; the reducing structure of the present invention enables the packer to be released by reducing the diameter, which can ensure the smooth release of the packer and improve the effectiveness of release. Attached Figure Description

[0022] Figure 1 is a cross-sectional view of a packer setting tool according to an embodiment of the present invention;

[0023] Figure 2 is a cross-sectional view of the packer setting tool after the reduced diameter structure of the present invention is separated from the packer.

[0024] Figure 3 is a schematic diagram of the sealing tool and packer connected according to an embodiment of the present invention;

[0025] Figure 4 is a schematic diagram of the tubular connection of the setting tool according to an embodiment of the present invention during specific use;

[0026] Figure 5 is a schematic diagram of the support sleeve according to an embodiment of the present invention;

[0027] Figure 6 is a front view of the support sleeve according to an embodiment of the present invention;

[0028] Figure 7 is a schematic diagram of the claw sleeve according to an embodiment of the present invention;

[0029] Figures 8 and 9 are schematic diagrams of the connecting claws according to an embodiment of the present invention;

[0030] Figure 10 is a front view of the connecting claw according to an embodiment of the present invention;

[0031] Figure 11 is a schematic diagram of the pressing strip according to an embodiment of the present invention;

[0032] Figure 12 is a schematic diagram of the detachable sleeve according to an embodiment of the present invention;

[0033] The reference numerals in the figure are as follows: mandrel 10, slot 101, pressure transmission hole 102, limiting hole 103, release cavity 104, release cavity 105, limiting sleeve 11, upper sleeve 12, elastic ring 13, release sleeve 14, insertion finger 141, first connecting structure 21, pressing strip 22, connecting claw 23, mating tooth 231, relief groove 232, external thread structure 233, pressing block 234, support sleeve 24, protrusion 241, ring groove 242, claw sleeve 25, mounting hole 251, limiting joint 26, inner support shaft 31, sealing element 32, guide shoe 33;

[0034] 1. Casing; 2. Setting tool; 3. Packer; 4. Oil pipe; 5. Ball seat; 6. Setting ball. Detailed Implementation

[0035] To better understand the purpose, structure, and function of this invention, a packer setting tool of this invention will be described in further detail below with reference to the accompanying drawings.

[0036] Figures 1-3 and 5-6 illustrate a packer setting tool according to an embodiment of the present invention, including a mandrel 10. A flow channel extending from top to bottom and penetrating the mandrel 10 is formed on the mandrel 10. A support sleeve 24 is connected to the outside of the mandrel 10 via a first connecting structure 21. A closed release chamber 104 is provided between the mandrel 10 and the support sleeve 24. A pressure transmission hole 102 communicating with the release chamber 104 is formed on the mandrel 10. The first connecting structure 21 can be sheared by the pressure of the medium inside the release chamber 104. A support sleeve 24 is fitted on the outside of the support sleeve. A reduced-diameter structure is used to connect with the packer 3. The spindle 10 is provided with a first limiting step to restrict the upward movement of the support sleeve 24. The first limiting structure is fixedly connected to the spindle 10. The reduced-diameter structure is fixedly connected to the first limiting structure. The first limiting structure is used to limit the downward movement of the support sleeve 24. When the support sleeve 24 moves down to the first limiting structure, the diameter of the reduced-diameter structure decreases so that the reduced-diameter structure can disengage from the packer 3. A sealing assembly is fixedly and sealed below the first limiting structure. The sealing assembly is used to seal the annular space between the spindle 10 and the packer 3.

[0037] The setting tool of this embodiment can realize the insertion of the packer 3 and the release of the packer 3 after setting. Specifically, the setting tool includes a mandrel 10, a support sleeve 24, a diameter reduction structure and a first limiting structure. The first limiting structure is fixedly connected to the mandrel 10, the first limiting structure is fixedly connected to the diameter reduction structure, and the diameter reduction structure is connected to the packer 3, so that the packer 3 can be inserted into the sleeve through the setting tool.

[0038] Secondly, the spindle 10 is connected to the support sleeve 24 through the first connecting structure 21. When the shear force on the first connecting structure 21 is greater than its shearing limit, the first connecting structure 21 can be sheared. Since a closed release chamber 104 is formed between the spindle 10 and the support sleeve 24, and the flow channel is connected to the release chamber 104 through the pressure transmission hole 102 on the spindle 10, when a medium (such as hydraulic oil) is added to the flow channel, the medium will flow into the release chamber 104 through the pressure transmission hole 102, and the pressure in the release chamber 104 will increase. When the pressure in the release chamber 104 increases to the point that the first connecting structure 21 is sheared, the support sleeve 24 will move relative to the spindle 10 under the pressure in the release chamber 104.

[0039] Secondly, the mandrel 10 is provided with a first limiting step that restricts the upward movement of the support sleeve 24. Therefore, the support sleeve 24 cannot move upward relative to the mandrel 10, and can only move downward relative to the mandrel 10. The first limiting structure is set below the support sleeve 24. The first limiting structure is used to limit the downward movement distance of the support sleeve 24. When the support sleeve 24 moves downward to the first limiting structure, the diameter of the reduced diameter structure is reduced, thereby enabling the reduced diameter structure to detach from the packer 3.

[0040] Furthermore, the sealing assembly is located below the first limiting structure and is fixedly and sealed to the first limiting structure. The sealing assembly is used to seal the annular space between the mandrel 10 and the packer 3, so that the medium added through the flow channel can flow into the release chamber 104.

[0041] Finally, in practical use, as shown in Figure 4, the upper end of the setting tool 2 is connected to the oil pipe 4, and the setting tool 2 is connected to the packer 3 through the reducing structure and sealing assembly. The lower end of the packer 3 is connected to the oil pipe 4. During insertion, the packer 3 is driven into the oil pipe 4 by the oil pipe 4 and the setting tool 2. After insertion, the setting ball 6 is inserted into the oil pipe 4. When the setting ball 6 lands on the matching ball seat 5, the oil pipe 4 is blocked. After blocking, the packer 3 can be set. The setting of the packer 3 is achieved by injecting medium into the flow channel. The medium pressure during setting is set to P2. After the packer 3 is set, the medium continues to be injected. When the pressure increases to a certain value, the first connecting structure 21 is sheared, the support sleeve 24 moves down, and when the support sleeve 24 moves down to the first limiting structure, the diameter of the reducing structure decreases, as shown in Figure 2, realizing the release of the packer 3. The medium pressure during release is set to P3, then P3 > P2.

[0042] In one embodiment, as shown in FIG7, the reduced diameter structure includes a claw sleeve 25 fixedly connected to the first limiting structure and sleeved outside the support sleeve 24. The claw sleeve 25 has an installation hole 251, and a connecting claw 23 is provided in the installation hole 251. The connecting claw 23 is pressed onto the support sleeve 24 by a pressing structure. As shown in FIG5-6, a plurality of annular grooves 242 are provided on the outer wall of the support sleeve 24, and a protrusion 241 is provided between two adjacent annular grooves 242. As shown in FIG8 and FIG10, a plurality of mating teeth 231 are fixedly connected to the inner wall of the connecting claw 23. When the mating teeth 231 are located on the protrusion 241, the connecting claw 23 can be connected to the packer 3. When the support sleeve 24 moves down to the first limiting structure, each mating tooth 231 is located in the corresponding annular groove 242.

[0043] In this embodiment, the first limiting structure limits the claw sleeve 25 in the radial direction; the connecting claw 23 is located in the mounting hole 251 on the claw sleeve 25, so the connecting claw 23 cannot move in the radial direction; the pressing structure is used to press the connecting claw 23 onto the support sleeve 24, thereby limiting the connecting claw 23 in the flow channel diameter direction.

[0044] The insertion and release of the packer 3 are mainly achieved by changing the outer diameter of the connecting claw 23. Specifically, the outer wall of the support sleeve 24 has several annular grooves 242, and a protrusion 241 is provided between two adjacent annular grooves 242. Several mating teeth 231 are fixedly connected to the inner wall of the connecting claw 23. In the specific setting, the number of mating teeth 231 is equal to the number of annular grooves 242, and the size of the annular grooves 242 is larger than the size of the mating teeth 231, so that the mating teeth 231 can fall completely into the annular grooves 242. Therefore, when the mating teeth 231 on the connecting claw 23 are pressed on the protrusion 241 by the pressing structure, the outer diameter of the connecting claw 23 is at its maximum. At this time, the connecting claw 23 can connect with the packer 3. When the mating teeth 231 on the connecting claw 23 are pressed into the corresponding annular groove 242 by the pressing structure, the outer diameter of the connecting claw 23 is at its minimum, and the connecting claw 23 is disengaged from the packer 3.

[0045] Secondly, as the connecting claw 23 changes from being connected to the packer 3 to being disconnected from the packer 3, initially, the mating teeth 231 of the connecting claw 23 are pressed against the protrusion 241 of the support sleeve 24 by the pressing structure. When the first connecting structure 21 is cut off and the support sleeve 24 moves down, the protrusion 241 on the support sleeve 24 begins to move down relative to the mating teeth 231. When the support sleeve 24 moves down to contact the first limiting structure, the protrusion 241 on the support sleeve 24 moves down to be located between the two mating teeth 231. That is, the annular groove 242 on the support sleeve 24 moves to the mating teeth 231 of the connecting claw 23. The mating teeth 231 on the connecting claw 23 lose the support of the protrusion 241. Due to the operation of the pressing structure, the mating teeth 231 fall into the annular groove 242, thereby reducing the diameter of the connecting claw 23 and causing the connecting claw 23 to disengage from the packer 3.

[0046] In one embodiment, as shown in FIG11, the pressing structure is a pressing strip 22. One end of the pressing strip 22 is fixedly connected to the support sleeve 24. As shown in FIG8-9, a relief groove 232 is provided on the inner wall of the connecting claw 23. A pressing block 234 is provided in the relief groove 232. The pressing block 234 is fixedly connected to the connecting claw 23. The other end of the pressing strip 22 passes through the relief groove 232 and presses on the pressing block 234.

[0047] In this embodiment, the pressing structure is a pressing strip 22. One end of the pressing strip 22 is fixedly connected to the support sleeve 24, and the other end of the pressing strip 22 passes through the relief groove 232 and presses on the pressing block 234. It is necessary to satisfy that, initially, the other end of the pressing strip 22 presses on the pressing block 234, pressing the mating teeth 231 of the connecting claw 23 on the protrusion 241 of the support sleeve 24; when the support sleeve 24 moves to the lower limit position, the other end of the pressing strip 22 is still located on the pressing block 234.

[0048] Specifically, the upper end of the pressing strip 22 is fixedly connected to the support sleeve 24, the relief groove 232 is opened on the inner wall of the connecting claw 23 and extends to penetrate the upper end of the connecting claw 23, the pressing block 234 is disposed in the relief groove 232, and the pressing block 234 is fixedly connected to the connecting claw 23.

[0049] As mentioned above, when the outer diameter of the connecting claw 23 is at its maximum, the connecting claw 23 can connect with the packer 3. Specifically, the connecting claw 23 and the packer 3 are connected by a thread, as shown in Figure 10. The outer wall of the connecting claw 23 is provided with an external thread structure 233, and the connecting claw 23 is connected to the packer 3 through the external thread structure 233. Therefore, when the connecting claw 23 cannot be separated from the packer 3 by injecting the aforementioned medium, the external thread structure 233 on the connecting claw 23 can be unscrewed from the packer 3 by rotating the oil pipe connected to the setting tool, thereby separating the connecting claw 23 from the packer 3.

[0050] Secondly, in specific settings, the mounting holes 251 can be set to a number as needed, such as 4 in Figure 7. Each mounting hole 251 has a connecting claw 23. Each connecting claw 23 is pressed onto the support sleeve 24 by a pressing structure. Each connecting claw 23 is connected to the packer 3 by an external thread structure 233.

[0051] Furthermore, in specific configurations, the first connecting structure 21 is the first shear pin.

[0052] Finally, to ensure the sealing of the release chamber 104, a first sealing structure is provided between the spindle 10 and the support sleeve 24 on both sides of the pressure transmission hole 102. When the support sleeve 24 moves down to the first limiting structure, the two first sealing structures are still located on both sides of the pressure transmission hole 102. The first sealing structure is a structure in which a sealing groove and a sealing ring are matched.

[0053] In one embodiment, the first limiting structure is a limiting connector 26, which is sleeved on the mandrel 10 and fixedly and sealed to the mandrel 10. The limiting connector 26 is also fixedly connected to the claw sleeve 25. In this embodiment, the fixed connection between the limiting connector 26 and the mandrel 10 can be achieved using a pin. Simultaneously, the limiting connector 26 and the mandrel 10 are sealed together to prevent leakage of the injected medium between them. The fixed connection between the limiting connector 26 and the claw sleeve 25 allows for axial limiting of the claw sleeve 25.

[0054] In one embodiment, the sealing assembly includes an inner support shaft 31 that is fixedly and sealingly connected to the limiting joint 26. A sealing element 32 is sleeved on the inner support shaft 31. The sealing element 32 is used to seal the annular space between the inner support shaft 31 and the packer 3. A guide shoe 33 is fixedly and sealingly connected to the lower end of the inner support shaft 31. The lower end of the guide shoe 33 is provided with a slope.

[0055] In this embodiment, the fixed connection between the limiting joint 26 and the inner support shaft 31 can be achieved by a threaded structure, and the fixed connection between the inner support shaft 31 and the guide shoe 33 can also be achieved by a threaded structure. The lower end of the guide shoe 33 is a bevel, which facilitates the insertion of the sealing tool. The sealing connection between the limiting joint 26 and the inner support shaft 31 can be achieved by a sealing groove and a sealing ring.

[0056] In one embodiment, a torque transmission structure is connected to the spindle 10, the torque transmission structure is located above the support sleeve 24, the torque transmission structure is used to connect with the packer 3 to transmit torque to the packer 3, and the torque transmission structure can be disconnected from the packer 3.

[0057] In this embodiment, the torque transmission structure is located above the support sleeve 24. The torque transmission structure can connect to the packer 3 to transmit torque to the packer 3, and can also disconnect from the packer 3.

[0058] Specifically, the torque transmission structure includes a release sleeve 14, as shown in Figure 12. The lower end of the release sleeve 14 is provided with insert fingers 141, which engage with slots on the packer 3 to transmit torque to the packer 3 via the release sleeve 14. In this embodiment, the torque transmission structure transmits torque to the packer 3 through the release sleeve 14. The lower end of the release sleeve 14 is provided with a ring of insert fingers 141, which fit perfectly into the slots on the upper end of the packer 3. Therefore, when the release sleeve 14 rotates, the sidewalls of the insert fingers 141 at the lower end of the release sleeve 14 can push the packer 3 to rotate, thereby achieving the purpose of transmitting torque to the packer 3 via the release sleeve 14.

[0059] Secondly, the release sleeve 14 is fixedly connected to the spindle 10 through the second connecting structure. A sealed release cavity 105 is provided between the release sleeve 14 and the spindle 10. The spindle 10 has a slot 101 that communicates with the release cavity 105. The second connecting structure can be sheared by the pressure of the medium in the release cavity 105. When the second connecting structure is sheared, the pressure in the release cavity 105 is less than the pressure in the release cavity 104 when the first connecting structure 21 is sheared.

[0060] The slot 101 is connected to the disconnection cavity 105. Therefore, when the medium is injected into the flow channel, the medium can enter the disconnection cavity 105 through the slot 101. Since the pressure in the disconnection cavity 105 corresponding to the second connecting structure being cut is less than the pressure in the disconnection cavity 104 corresponding to the first connecting structure 21 being cut, after the medium is injected through the flow channel, the injected medium enters the disconnection cavity 105, first causing the second connecting structure to be cut. If the medium pressure when the second connecting structure is cut is set to P1, then P2 > P1. After the second connecting structure is cut, relative movement can occur between the disconnection sleeve 14 and the mandrel 10.

[0061] Furthermore, the spindle 10 is provided with a second limiting step to restrict the downward movement of the release sleeve 14. The spindle 10 above the release sleeve 14 is connected to a second limiting structure. The second limiting structure is used to limit the upward movement distance of the release sleeve 14. When the release sleeve 14 moves upward to the second limiting structure, as shown in Figure 2, the insertion finger 141 disengages from the slot on the packer 3.

[0062] Because the second limiting structure restricts the downward movement of the release sleeve 14, the release sleeve 14 cannot move downward relative to the mandrel 10. Under the pressure of the medium in the release cavity 105, the release sleeve 14 can only move upward relative to the mandrel 10. As the release sleeve 14 moves upward relative to the mandrel 10, the insertion finger 141 gradually disengages from the slot of the packer 3. The mandrel 10 above the release sleeve 14 is connected to the second limiting structure, which is used to limit the upward movement distance of the release sleeve 14. In order to ensure that the torsion transmission structure disengages from the packer 3 when the release sleeve 14 moves to the second limiting structure, it is necessary to ensure that when the release sleeve 14 moves upward to the second limiting structure, the insertion finger 141 completely disengages from the slot on the packer 3.

[0063] In one embodiment, an upper sleeve 12 is fixedly connected above the release sleeve 14, and the upper sleeve 12 is fitted onto the spindle 10. The second limiting structure includes an elastic ring 13 disposed between the upper sleeve 12 and the release sleeve 14. A limiting hole 103 that cooperates with the elastic ring 13 is provided on the spindle 10 above the elastic ring 13. When the release sleeve 14 moves upward to the point where the elastic ring 13 is located in the limiting hole 103, the elastic ring 13 opens up and gets stuck between the limiting hole 103 and the release sleeve 14, preventing the release sleeve 14 from moving upward.

[0064] Specifically, the release sleeve 14 is fixedly connected to the upper sleeve 12, and an elastic ring 13 is provided between the release sleeve 14 and the upper sleeve 12. When the release sleeve 14 moves upward, it pushes the elastic ring 13 upward. When the elastic ring 13 moves upward to be located in the limiting hole 103, the elastic ring 13 opens. After opening, the thickness of the elastic ring 13 is greater than the depth of the limiting hole 103, so that the elastic ring 13 is stuck between the limiting hole 103 and the release sleeve 14. Due to the obstruction of the elastic ring 13, the release sleeve 14 cannot continue to move upward, thereby limiting the upward distance of the release sleeve 14.

[0065] In one embodiment, a second sealing structure is provided between the release sleeve 14 and the mandrel 10 on both sides of the slot 101. When the release sleeve 14 moves up to the point where the elastic ring 13 is located in the limiting hole 103, the two second sealing structures are still located on both sides of the slot 101.

[0066] A limiting sleeve 11 is fitted onto the mandrel 10. The limiting sleeve 11 is located above the upper sleeve 12, and when the disengaging sleeve 14 moves upward until the elastic ring 13 is located within the limiting hole 103, the upper sleeve 12 contacts the limiting sleeve 11. In this embodiment, the limiting sleeve 11 is provided to limit the upward movement distance of the disengaging sleeve 14, preventing the disengaging sleeve 14 from continuing to move upward due to the elastic ring 13 failing to open smoothly; the second connecting structure is a second shear pin.

[0067] To facilitate understanding of the embodiments of the present invention, the following description follows the operational process in specific use:

[0068] In a specific use, as shown in Figure 3, the connection between the setting tool 2 and the packer 3 includes: the connection between the release structure and the packer 3, the connection between the reduced diameter structure and the packer 3, and the connection between the sealing assembly and the packer 3. The connection between the release structure and the packer 3 is achieved by the engagement of the insertion finger 141 on the release sleeve 14 and the slot of the packer 3. The connection between the reduced diameter structure and the packer 3 is achieved by the engagement of the connecting claw 23 and the packer 3. The connection between the sealing assembly and the packer 3 is achieved by the sealing element 32.

[0069] The packer 3 can be lowered into the casing using the setting tool 2.

[0070] After the packer 3 is lowered, when it is necessary to release the packer 3, the setting ball 6 needs to be inserted first, as shown in Figure 4, to set the packer 3 and the oil pipe 4 below the setting tool 2.

[0071] The specific method for releasing the packer is as follows:

[0072] A medium is added into the flow channel. The medium added into the flow channel enters the disconnection chamber 105 through the slot 101 and enters the release chamber 104 through the pressure transmission hole 102. When the medium pressure of the added medium reaches the medium pressure when the second connection structure is sheared, the second connection structure is sheared, and the release sleeve 14 moves up to the insertion finger 141 to disengage from the slot of the packer.

[0073] Continue adding the medium. When the added medium reaches the setting pressure of the packer, the packer sets.

[0074] Continue adding medium. When the pressure of the added medium reaches the pressure at which the first connecting structure 21 is sheared, the first connecting structure 21 is sheared, and the support sleeve 24 moves down. When the support sleeve 24 moves down to the first limiting structure, the connecting claw 23 disengages from the packer. This step can also be replaced by rotating the oil pipe connected to the setting tool until the threaded structure on the connecting claw 23 is unscrewed from the packer. Both methods of disengaging the connecting claw 23 from the packer can ensure that the packer is successfully released.

[0075] It should be noted that, unless otherwise stated, the technical or scientific terms used in this application should have the ordinary meaning as understood by one of ordinary skill in the art to which this invention pertains.

[0076] Furthermore, the terms "a," "two," etc., are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. In the description of this invention, "a plurality of" means two or more, unless otherwise explicitly defined.

[0077] In this application, unless otherwise expressly specified and limited, the terms "installation," "connection," "linking," and "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components. Those skilled in the art can understand the specific meaning of the above terms in this invention according to the specific circumstances.

[0078] 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 therein. 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, and they should all be covered within the scope of the claims and specification of the present invention. In particular, as long as there is no structural conflict, the various technical features mentioned in the embodiments can be combined in any way. The present invention is not limited to the specific embodiments disclosed herein, but includes all technical solutions falling within the scope of the claims.

Claims

1. A packer setting tool, characterized in that, The device includes a mandrel with a flow channel extending from top to bottom and penetrating the mandrel. A support sleeve is connected to the outside of the mandrel via a first connecting structure. A closed release chamber is provided between the mandrel and the support sleeve. A pressure-transmitting hole communicating with the release chamber is provided on the mandrel. The first connecting structure can be sheared by the pressure of the medium within the release chamber. A reduced-diameter structure is fitted outside the support sleeve for connection to a packer. A first limiting step restricts the upward movement of the support sleeve on the mandrel. A first limiting structure is fixedly connected to the mandrel, and the reduced-diameter structure is fixedly connected to the first limiting structure. The first limiting structure is used to restrict the downward movement of the support sleeve. The distance of movement is limited. When the support sleeve moves down to the first limiting structure, the diameter of the reducing structure decreases so that the reducing structure can disengage from the packer. A sealing assembly is fixedly and sealed below the first limiting structure. The sealing assembly is used to seal the annular space between the mandrel and the packer. The reducing structure includes a claw sleeve fixedly connected to the first limiting structure and sleeved outside the support sleeve. The claw sleeve has a mounting hole, and a connecting claw is provided in the mounting hole. The connecting claw is pressed onto the support sleeve by a pressing structure. Several annular grooves are provided on the outer wall of the support sleeve, and a protrusion is provided between two adjacent annular grooves. Several matching parts are fixedly connected to the inner wall of the connecting claw. The connecting claw can connect with the packer when the mating teeth are located on the protrusion. When the support sleeve moves down to the first limiting structure, each mating tooth is located in the corresponding annular groove. A torque transmission structure is connected to the mandrel, located above the support sleeve. The torque transmission structure is used to connect with the packer to transmit torque to the packer, and the torque transmission structure can disengage from the packer. The torque transmission structure includes a disengagement sleeve, the lower end of which is provided with an insert finger. The insert finger engages with a slot on the packer to transmit torque to the packer through the disengagement sleeve. The disengagement sleeve is fixed to the mandrel through a second connecting structure. The connection includes a sealed disengagement cavity between the disengagement sleeve and the mandrel. The mandrel has a slot communicating with the disengagement cavity. The second connection structure can be sheared by the pressure of the medium in the disengagement cavity, and the pressure in the disengagement cavity corresponding to the shearing of the second connection structure is less than the pressure in the disengagement cavity corresponding to the shearing of the first connection structure. The mandrel has a second limiting step that restricts the downward movement of the disengagement sleeve. The mandrel above the disengagement sleeve is connected to a second limiting structure, which limits the upward movement of the disengagement sleeve. When the disengagement sleeve moves upward to the second limiting structure, the insert finger disengages from the slot on the packer.

2. The packer setting tool according to claim 1, characterized in that, The pressing structure is a pressing strip. One end of the pressing strip is fixedly connected to the support sleeve. A clearance groove is provided on the inner wall of the connecting claw. A pressing block is provided in the clearance groove. The pressing block is fixedly connected to the connecting claw. The other end of the pressing strip passes through the clearance groove and presses on the pressing block.

3. The packer setting tool according to claim 1, characterized in that, The outer wall of the connecting claw is provided with an external thread structure, and the connecting claw is connected to the packer through the external thread structure; there are several mounting holes, and each mounting hole is provided with a connecting claw; the first connecting structure is a first shear pin; a first sealing structure is provided between the mandrel and the support sleeve on both sides of the pressure transmission hole, and when the support sleeve moves down to the first limiting structure, the two first sealing structures are still located on both sides of the pressure transmission hole.

4. The packer setting tool according to claim 1, characterized in that, The first limiting structure is a limiting joint, which is sleeved on the mandrel and is fixedly and sealed to the mandrel. The limiting joint is also fixedly connected to the claw sleeve.

5. The packer setting tool according to claim 4, characterized in that, The sealing assembly includes an inner support shaft that is fixedly and sealingly connected to the limiting joint. A sealing element is sleeved on the inner support shaft, and the sealing element is used to seal the annular space between the inner support shaft and the packer. A guide shoe is fixedly and sealingly connected to the lower end of the inner support shaft, and the lower end of the guide shoe is provided with a bevel.

6. The packer setting tool according to claim 1, characterized in that, An upper sleeve is fixedly connected above the release sleeve, and the upper sleeve is fitted onto the mandrel. The second limiting structure includes an elastic ring disposed between the upper sleeve and the release sleeve. A limiting hole is provided on the mandrel above the elastic ring to cooperate with the elastic ring. When the release sleeve moves upward to the point where the elastic ring is located in the limiting hole, the elastic ring opens up and gets stuck between the limiting hole and the release sleeve, preventing the release sleeve from moving upward.

7. The packer setting tool according to claim 6, characterized in that, A second sealing structure is provided between the release sleeve and the mandrel on both sides of the slot. When the release sleeve moves up to the point where the elastic ring is located in the limiting hole, the two second sealing structures are still located on both sides of the slot. A limiting sleeve is fitted on the mandrel. The limiting sleeve is located above the upper sleeve. When the release sleeve moves up to the point where the elastic ring is located in the limiting hole, the upper sleeve contacts the limiting sleeve. The second connecting structure is a second shear pin.

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