Split type slip packer and using method and application thereof

Abstract

The invention discloses a split type slip packer and a using method and application thereof. The packer comprises a setting mechanism and an anchoring mechanism, wherein the setting mechanism comprises a slip bowl and a setting sleeve, and the anchoring mechanism comprises a plurality of slips arranged along the circumference of the setting sleeve at intervals. At least one steering spiral groove is formed in one end of the setting sleeve, and a plurality of anchoring spiral grooves are formed in the other end of the setting sleeve; a first matching body matched with the steering spiral groove is arranged at the lower end of the slip bowl, the slip comprises a slip base body and a second matching body which is arranged on the bottom face of the slip base body and matched with the anchoring spiral groove, and the face, making contact with the second matching body, of the anchoring spiral groove is in an arc shape. In the process that the slip bowl moves downwards or upwards under the action of external force, the setting sleeve rotates through matching of the first matching body and the steering spiral groove, and then the slip is driven to move along the anchoring spiral groove through matching of the second matching body and the anchoring spiral groove, so that the slip is expanded and anchored in the radial direction or contracted and reset. The phenomenon of uneven stress of the slip teeth during anchoring can be relieved.

Description

Technical Field

[0001] This invention relates to the field of petroleum machinery technology, and in particular to a segmented slip packer and its usage and application. Background Technology

[0002] Slip packers are widely used in oil wells, gas wells, and other mining wells to isolate lower oil, gas, and water layers. They are a safe, reliable, low-cost, versatile, and widely applicable downhole plugging tool. Packers can be used in conjunction with other downhole tools for temporary plugging, permanent plugging, selective plugging, and non-controlling well operations.

[0003] In the existing split-type slip packer anchoring mechanism, the slip is located outside the cone, and the mating surface with the cone is a conical surface. During the packer setting process, the cone squeezes the slip outward to expand it, shears off the pin that radially limits the slip, and causes the slip teeth to embed into the outer sleeve, thereby achieving the anchoring between the packer and the sleeve. Summary of the Invention

[0004] Existing segmented slip packers, when the slips are compressed by the cone, have slip teeth that sequentially embed into the sleeve starting from the end closest to the cone. This means that the teeth of each slip cannot anchor simultaneously during operation, resulting in uneven setting of the segmented slips. This causes large stress concentrations at the contact points between the slip teeth (usually those near the cone end) and the sleeve, easily damaging the slip teeth and the inner wall of the sleeve, shortening the tool's lifespan, and increasing costs. Furthermore, the existing structure, which uses the conical surfaces of the cone and slips to achieve setting and unsetting, is prone to problems where multiple slips cannot retract simultaneously, leading to unsetting failure and affecting normal production operations. In addition, existing slip packers require pins to radially limit the slips during insertion, and these pins need to be cut during anchoring to achieve radial expansion of the slips. This means that only one setting can be achieved per insertion of the tubing, resulting in high operating costs.

[0005] In view of the above problems, the present invention is proposed to provide a segmented slip packer and its method of use and application that overcomes or at least partially solves the above problems.

[0006] The split-type slip packer provided in this embodiment of the invention includes: a setting mechanism and an anchoring mechanism arranged sequentially;

[0007] The setting mechanism includes: a slip seat and a setting sleeve; the anchoring mechanism includes: a plurality of slips spaced apart along the circumference of the setting sleeve;

[0008] The setting sleeve has at least one directional spiral groove at one end and multiple anchoring spiral grooves at the other end; the lower end of the slip seat has a first mating body adapted to the directional spiral groove, the slip includes: a slip base and a second mating body disposed on the bottom surface of the slip base for adapting to the anchoring spiral groove, and the surface in contact with the second mating body is arc-shaped;

[0009] As the slip seat moves downward under the action of external force, the first mating body and the steering spiral groove make the setting sleeve rotate. Then, the second mating body and the anchoring spiral groove drive the slip to move along the anchoring spiral groove, so that the slip expands radially to achieve anchoring between the slip and the outer sleeve.

[0010] As the slip seat moves upward under the action of external force, the first mating body and the steering spiral groove cause the setting sleeve to rotate in the opposite direction, thereby driving the slip to reset.

[0011] In an optional embodiment, the anchoring mechanism further includes: a fixing cylinder and a slip limiting sleeve;

[0012] The fixing sleeve is sleeved on the setting sleeve and has multiple grooves along its circumference. The slip base is disposed in the grooves so as to limit the movement of the slip base through the grooves.

[0013] The upper end of the locking sleeve is provided with a fixing cylinder groove, and the lower end is fixedly connected. The lower end of the fixing cylinder is set in the fixing cylinder groove.

[0014] In an optional embodiment, the turning spiral groove has the opposite rotation direction to the anchoring spiral groove, and the helix angle of the edge guide line of the turning spiral groove is the same as that of the edge guide line of the anchoring spiral groove.

[0015] In an optional embodiment, the second ligand is disposed at the middle position of the kava matrix.

[0016] In an optional embodiment, a plurality of anchoring helical grooves are evenly distributed along the outer wall of the setting sleeve;

[0017] When multiple steering helical grooves are provided, the multiple steering helical grooves are evenly distributed along the outer wall of the setting sleeve.

[0018] In an optional embodiment, the segmented slip packer provided by the present invention further includes: a central tube, an upper connector, a sealing mechanism, and a straightening mechanism;

[0019] The upper connector, sealing mechanism, setting mechanism, anchoring mechanism, and straightening mechanism are arranged sequentially from top to bottom outside the central tube, and the upper end of the sealing mechanism is connected to the lower end of the upper connector, while the lower end is connected to the slip seat.

[0020] The straightening mechanism is provided with a J-shaped groove including a long track and a short track. The central tube is provided with a guide pin that is adapted to the J-shaped groove. When the central tube is lifted and rotated, the movement track of the guide pin in the J-shaped groove can be changed.

[0021] As the central tube is lowered along the long track of the J-shaped groove, it drives the upper connector and sealing mechanism to move downward, providing an external force for the downward movement of the slip seat, and causing the sealing mechanism to seal with the outer sleeve under the squeezing action of the upper connector and the slip seat; as the central tube is lifted along the long track of the J-shaped groove, it drives the upper connector and sealing mechanism to move upward, so that the sealing mechanism releases the seal between itself and the outer sleeve, and provides an external force for the upward movement of the slip seat.

[0022] In an optional embodiment, during the lifting of the central tube, the lifting distance of the central tube is limited by the top dead point of the J-shaped groove.

[0023] In an optional embodiment, the upper end of the central tube is provided with a plurality of circumferential limiting keys; the inner wall of the slip seat is provided with a plurality of through grooves, so as to circumferentially limit the slip seat by the cooperation of the circumferential limiting keys and the through grooves.

[0024] In an optional embodiment, the straightening mechanism includes: a friction reversing sleeve and a plurality of friction reversing segments;

[0025] The upper end of the friction reversing sleeve is connected to the lower end of the slip limiting sleeve, and the J-shaped groove is provided on the inner wall of the friction reversing sleeve;

[0026] Multiple friction commutator segments are spaced apart on the outer circumference of the friction commutator sleeve, and one end of the friction commutator segment is fixed by a friction segment limiting sleeve sleeved outside the friction commutator sleeve, and the other end is fixed by a friction segment threaded sleeve sleeved outside the friction commutator sleeve.

[0027] In an optional embodiment, the segmented slip packer provided by the present invention further includes: a pressure ring;

[0028] The pressure ring is disposed between the slip seat and the sealing mechanism, with one end connected to the sealing mechanism and the other end connected to one end of the slip seat.

[0029] In an optional embodiment, the sealing mechanism includes: a plurality of rubber tubes sleeved around the central tube, a spacer ring disposed between adjacent rubber tubes, and a support ring disposed at the outer ends of the rubber tubes located at both ends.

[0030] Based on the same inventive concept, this invention also provides a method for using the above-mentioned segmented slip packer, characterized in that it includes:

[0031] The split-type slip packer is lowered into the pre-set position downhole along with the tubing string. Initial anchoring is achieved through the straightening mechanism. The center tube is then lifted and rotated to switch the guide pin from the short track of the J-shaped groove to its long track. The center tube is then lowered, causing the sealing mechanism and slip seat to move downwards. This allows the first mating body to engage with the reversing helical groove, causing the setting sleeve to rotate. Subsequently, the anchoring helical groove engages with the second mating body, causing the slip to expand radially to achieve anchoring between the slip and the outer casing. The center tube is then lowered further to seal the sealing mechanism with the outer casing.

[0032] When it is necessary to release the anchor, lift the central tube, which will move the upper connector and sealing mechanism upward to release the seal between the sealing mechanism and the outer sleeve. Then, continue to lift the central tube, which will move the slip seat upward. Through the cooperation of the first mating body and the reversing spiral groove, the setting sleeve will rotate in the opposite direction. Then, through the cooperation of the anchoring spiral groove and the second mating body, the slip will shrink radially to release the anchor between the slip and the outer sleeve. Then, rotate the central tube in the opposite direction to switch the guide pin back into the short track of the J-shaped groove, so that the split slip packer returns to its initial state.

[0033] In an optional embodiment, the above-described method of use further includes: after the split-slip packer returns to its initial state, moving the split-slip packer to the next position to repeat the setting and unsealing operations.

[0034] Based on the same inventive concept, this invention also provides an application of the above-mentioned segmented slip packer in the field of petroleum machinery technology.

[0035] The beneficial effects of the above-described technical solutions provided in the embodiments of the present invention include at least the following:

[0036] The split-type slip packer provided in this embodiment of the invention has a setting sleeve with at least one directional spiral groove at one end and multiple anchoring spiral grooves at the other end. A first mating body adapted to the directional spiral groove is provided at the lower end of the slip seat, and a second mating body adapted to the anchoring spiral groove is provided on the slip base. The contact surface between the anchoring spiral groove and the second mating body is arc-shaped. In application, the slip seat moves downward under external force. The contact between the first mating body and the directional spiral groove causes the setting sleeve to rotate. Then, the engagement between the second mating body and the anchoring spiral groove drives the slip to move along the anchoring spiral groove, causing the slip to expand radially, thus achieving anchoring between the slip and the outer sleeve. In other words, the packer provided in this embodiment of the invention, through the engagement between the second mating body and the anchoring spiral groove, drives the entire slip structure to expand uniformly outward, allowing the slip teeth to be evenly embedded in the sleeve. Compared with existing slip packer structures, this reduces stress unevenness and improves anchoring reliability.

[0037] Furthermore, when the packer needs to be unsealed, the slip seat moves upward under external force. The contact engagement between the first mating body and the steering helical groove causes the setting sleeve to rotate in the opposite direction, thereby resetting the slips and the sealing mechanism. Then, by rotating the central tube, the guide pin switches back to the short track, allowing the segmented slip packer to return to its initial state without affecting its reuse. The segmented slip packer allows for setting and unsealing at different locations downhole in a single tubing run, simplifying downhole operations, increasing tool life, and saving production costs. In this embodiment, when the central tube is lifted, the second mating body and the anchoring helical groove cause the entire slip structure to contract uniformly inward, simultaneously unsealing the slips. This reduces the probability of individual slip unsealing failures during the unsealing process, improving the reliability and efficiency of the slip packer and minimizing the impact of frequent tool replacements after tool damage on production.

[0038] Other features and advantages of the invention will be set forth in the description which follows, and will be apparent in part from the description, or may be learned by practicing the invention. The objects and other advantages of the invention may be realized and obtained by means of the structures particularly pointed out in the written description, claims, and drawings.

[0039] The technical solution of the present invention will be further described in detail below with reference to the accompanying drawings and embodiments. Attached Figure Description

[0040] The accompanying drawings are provided to further illustrate the invention and form part of the specification. They are used in conjunction with embodiments of the invention to explain the invention and do not constitute a limitation thereof. In the drawings:

[0041] Figure 1 This is a schematic diagram of the structure of the segmented slot divider in an embodiment of the present invention;

[0042] Figure 2 This is a schematic diagram of the structure of the split-type slip divider in the seated state in an embodiment of the present invention;

[0043] Figure 3 This is a schematic diagram of the structure of the locking seat in an embodiment of the present invention;

[0044] Figure 4 This is a schematic diagram of the structure of the setting sleeve in an embodiment of the present invention;

[0045] Figure 5 This is a schematic diagram of the structure of the locking seat in an embodiment of the present invention;

[0046] Figure 6 This is a schematic diagram of the structure of the central tube in an embodiment of the present invention;

[0047] Figure 7 This is a schematic diagram of the friction reversing sleeve in an embodiment of the present invention;

[0048] Figure 8 This is a cross-sectional view of the straightening mechanism in an embodiment of the present invention.

[0049] Explanation of reference numerals in the attached figures:

[0050] 100. Sealing mechanism; 200. Anchoring mechanism; 300. Righting mechanism; 400. Sealing mechanism;

[0051] 1. Central tube; 2. Friction plate threaded sleeve; 3. Friction reversing plate; 4. Friction reversing sleeve; 5. Friction plate limiting sleeve; 6. Slip limiting sleeve; 7. Slip; 8. Fixing sleeve; 9. Setting sleeve; 10. Slip seat; 11. Pressure ring; 12. Rubber sleeve; 13. Spacer ring; 14. Support ring; 15. Upper connector;

[0052] 101. Connecting thread; 102. Circumferential limit key; 103. Guide pin; 401. Mounting groove; 402. J-groove; 701. Slip body; 702. Second mating body; 901. Directional spiral groove; 902. Anchoring spiral groove; 1001. Threaded hole; 1002. Through groove; 1003. First mating body; 4021. Short rail; 4022. Long rail. Detailed Implementation

[0053] Exemplary embodiments of the present disclosure will now be described in more detail with reference to the accompanying drawings. While exemplary embodiments of the present disclosure are shown in the drawings, it should be understood that the present disclosure may be implemented in various forms and should not be limited to the embodiments set forth herein. Rather, these embodiments are provided so that this disclosure will be thorough and complete, and will fully convey the scope of the disclosure to those skilled in the art.

[0054] In the description of this invention, it should be noted that the terms "center," "upper," "lower," "left," "right," "vertical," "horizontal," "inner," and "outer," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are used only for the convenience of describing the invention and for simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on the invention. Furthermore, the terms "first," "second," and "third" are used for descriptive purposes only and should not be construed as indicating or implying relative importance.

[0055] In the description of this invention, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "linking" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; 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; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this invention based on the specific circumstances.

[0056] To address the problems existing in the prior art, this invention provides a segmented slip packer, its usage method, and its application. It should be noted that in this embodiment, "multiple" refers to two or more; and in this example, after the segmented slip packer is lowered into the well, the end closer to the wellhead is referred to as the "upper" end, and the end closer to the bottom of the well is referred to as the "lower" end.

[0057] The split-type kava 7 packer provided in this embodiment of the invention refers to... Figures 1 to 5 As shown, it includes: a setting mechanism 100 and an anchoring mechanism 200 arranged sequentially;

[0058] The setting mechanism 100 includes a slip seat 10 and a setting sleeve 9; the anchoring mechanism 200 includes a plurality of slips 7 spaced apart along the circumference of the setting sleeve 9.

[0059] The setting sleeve 9 has at least one directional spiral groove 901 at one end and multiple anchoring spiral grooves 902 at the other end; the lower end of the slip seat 10 has a first mating body 1003 adapted to the directional spiral groove 901; the slip 7 includes: a slip base 701 and a second mating body 703 disposed on the bottom surface of the slip base 701 for mating with the anchoring spiral groove 902, so that the connection between the slip 7 and the setting sleeve 9 is realized through the mating of the second mating body 703 and the anchoring spiral groove 902, and the surface in contact between the anchoring spiral groove 902 and the second mating body 703 is arc-shaped;

[0060] As the slip seat 10 moves downward under the action of external force, the first mating body 1003 and the turning spiral groove 901 cause the setting sleeve 9 to rotate. Then, the second mating body 703 and the anchoring spiral groove 902 drive the slip 7 to move along the anchoring spiral groove 902, causing the slip 7 to expand radially, so as to achieve anchoring between the slip 7 and the outer sleeve.

[0061] As the slip seat 10 moves upward under the action of external force, the first mating body 1003 and the steering spiral groove 901 cause the setting sleeve 9 to rotate in the opposite direction, thereby driving the slip 7 to reset.

[0062] The split-type slip packer provided in this embodiment of the invention can achieve simultaneous setting and unsetting of multiple slips 7 by utilizing the sliding of the first mating body at the bottom of the slip base 701 in the anchoring spiral groove 902 provided on the setting sleeve 9. This can effectively improve working reliability and efficiency, while also saving costs.

[0063] It should be noted that the specific structure of the segmented slip packer in this embodiment of the invention is not limited to the first mating body 1003 and the second mating body 703, as long as they can achieve the required functions; for example: refer to Figure 3 As shown, the first mating body 1003 can be a cylinder disposed on the lower outer wall of the slip seat 10. The specific number of the first mating bodies 1003 is not specifically limited in this embodiment of the invention; it only needs to correspond to the number of steering spiral grooves 901. When multiple first mating bodies 1003 are provided, they can be evenly distributed circumferentially along the lower outer wall of the slip seat 10. For example: Refer to... Figure 5 As shown, the second ligand 703 can be a stepped axial cylindrical structure, and optionally... Figure 5 In the stepped axial cylindrical structure, the cylinder that contacts the anchoring spiral groove 902 can also be a sphere or other structure, which can be selected according to actual needs.

[0064] Furthermore, in this embodiment of the invention, the slope of the arc of the surface 902 where the anchoring spiral groove 902 contacts the second mating body 703 and turns towards the spiral groove 9011 is not specifically limited, as long as it enables the slip 7 to be anchored to the outer sleeve when it moves radially along the arc under the cooperation of the first mating body and the anchoring spiral groove 902. In specific design, it can be determined according to relevant influencing factors such as the diameter of the outer sleeve and the movement stroke of the slip 7 in the anchoring spiral groove 902. For example, if the diameter of the outer sleeve is larger, the slope of the arc surface can be set to be larger accordingly; if the diameter of the outer sleeve is smaller, the slope of the arc surface can be set to be smaller accordingly. For another example, if the radial expansion dimension of the slip 7 is to be larger under the same movement stroke, the slope of the arc surface can be increased accordingly, etc. The specific design can be carried out according to actual needs.

[0065] In one embodiment, the segmented Kaval 7 packer provided in this invention refers to... Figure 1 As shown, the anchoring mechanism 200 also includes: a fixing cylinder 8 and a slip limiting sleeve 66;

[0066] The fixed cylinder 8 is sleeved on the setting sleeve 9 and has multiple grooves 801 along its circumference. The slip base 701 is set in the grooves 801 to limit the movement of the slip base 701. That is, when the slip 7 moves along the anchoring spiral groove 902, the limiting effect of the grooves 801 can prevent the slip 7 from rotating, so as not to affect the normal setting operation.

[0067] The upper end of the locking sleeve 66 is provided with a fixing cylinder groove, and the lower end is fixedly connected. The lower end of the fixing cylinder 8 is set in the fixing cylinder groove.

[0068] In one embodiment, to enable the slip seat 10 to move upward or downward under external force, the engagement between the first mating body 1003 and the steering spiral groove 901 can better drive the slip 7 to move synchronously; see reference Figure 4 As shown, the specific structures of the steering spiral groove 901 and the anchoring spiral groove 902 are as follows: the spiral directions of the steering spiral groove 901 and the anchoring spiral groove 902 are opposite, and the helix angles of the edge guide line 9011 of the steering spiral groove 901 and the edge guide line 9021 of the anchoring spiral groove 902 are the same, that is, the curvature of the edge guide line of the steering spiral groove 901 and the edge guide line of the anchoring spiral groove 902 are the same. In this embodiment, the helix angle is the angle between the tangent of the edge guide line of each spiral groove and the plane perpendicular to the axis of the setting sleeve 9.

[0069] In one embodiment, in order to ensure that the force on the upper and lower ends of the slip 7 is uniform when it moves along the anchoring spiral groove 902 under the cooperation of the second mating body 703 and the anchoring spiral groove 902, the second mating body 703 may optionally be disposed in the middle position of the slip base 701.

[0070] In one embodiment, refer to Figure 4 As shown, multiple anchoring spiral grooves 902 are evenly distributed along the outer wall of the setting sleeve 9;

[0071] When multiple steering spiral grooves 901 are provided, the multiple steering spiral grooves 901 are evenly distributed along the outer wall of the setting sleeve 9.

[0072] It should be noted that the present invention does not impose a specific limit on the number of anchoring spiral grooves 902 and steering spiral grooves 901, as long as the corresponding functions can be achieved; wherein, the number of anchoring spiral grooves 902 corresponds to the number of clamps 7 to be set, and the number of steering spiral grooves 901 can be set to one or two or more. For example, in one embodiment, the steering spiral grooves 901 can be set to two symmetrical ones.

[0073] In one embodiment, refer to Figure 1 As shown, the split-type 7 packer provided in this embodiment of the invention further includes: a central tube 1, an upper connector 15, a sealing mechanism 400, and a straightening mechanism 300;

[0074] The upper connector 15, sealing mechanism 400, setting mechanism 100, anchoring mechanism 200, and straightening mechanism 300 are arranged sequentially from top to bottom outside the central tube 1. The upper end of the sealing mechanism 400 is connected to the lower end of the upper connector 15, and the lower end is connected to the slip seat 10. For details, refer to... Figure 6 As shown, one end of the central tube 11 is provided with a connecting thread 101 in the circumferential direction. The central tube 1 is connected to the large end face of the upper connector through the connecting thread 101. The central tube 1 is relatively slidably arranged with the sealing mechanism 400, the setting mechanism 100, the anchoring mechanism 200, and the straightening mechanism 300.

[0075] Reference Figure 8 As shown, the straightening mechanism 300 is provided with a J-shaped groove 402 including a long track 4022 and a short track 4021. The central tube 1 is provided with a guide pin 103 that is adapted to the J-shaped groove 402. When the central tube 1 is lifted and rotated, the guide pin 103 can be switched on the moving track of the J-shaped groove 402.

[0076] During the process of lowering the central tube 1 along the long track 4022 of the J-shaped groove 402, it drives the upper connector 15 and the sealing mechanism 400 to move downward, providing an external force for the downward movement of the slip seat 10, and causing the sealing mechanism 400 to seal with the outer sleeve under the squeezing action of the upper connector 15 and the slip seat 10; during the process of lifting the central tube 1 along the long track 4022 of the J-shaped groove 402, it drives the upper connector and the sealing mechanism 400 to move upward, so that the sealing mechanism 400 releases the seal between itself and the outer sleeve, and provides an external force for the upward movement of the slip seat 10.

[0077] Specifically, in the split-slip packer provided in this embodiment of the invention, the guide pin 103 is initially located within the short track 4021 of the J-shaped groove 402. During application, after being lowered to the preset position downhole, it is initially fixed by the straightening mechanism 300. Then, by lifting and rotating the central tube 1, the guide pin 103's movement track in the J-shaped groove 402 is changed, transforming it from being located within the short track 4021 of the J-shaped groove 402 to being located within the long track 4022. Subsequently, the central tube 1 is lowered along the long track 4022. During the process, the upper connector 15 and the sealing mechanism 400 are moved downwards, providing an external force for the slip seat 10 to move downwards, causing the slip 7 to expand radially and achieve anchoring between the slip 7 and the outer sleeve. After the slip 7 and the outer sleeve are firmly anchored, during the continued lowering of the central tube 1, the upper connector presses the sealing mechanism downwards, and the anchored and firmly secured setting sleeve 9 pushes the slip seat 10 upwards to press the sealing mechanism 400, so that the sealing mechanism seals with the outer sleeve, thereby achieving the entire setting process. A schematic diagram of the split slip 7 packer in the setting state provided in this embodiment of the invention is shown below. Figure 2 As shown; when unsealing is required, by lifting the central tube 1, the upper connector and sealing mechanism are moved upward. The sealing mechanism and the outer casing are first unsealed. Then, while continuing to lift the central tube 1, an external force is provided to the slip seat 10 to move upward, so that each slip 7 can simultaneously retract and reset radially. At the same time, after the central tube 1 is lifted, by rotating the central tube 1 in the opposite direction, the guide pin 103 can be switched back into the long track 4022 of the J-shaped groove 402, so that the segmented slip 7 packer can be restored to the initial state when it was lowered into the well. After that, the packer can be moved to the next position to achieve re-seatling and unsealing. Therefore, the segmented slip 7 packer of the present invention can achieve multiple uniform seating and unsealing in one trip of the tubing string through the designed new anchoring mechanism 200, which simplifies downhole operation, improves tool life, and greatly saves costs.

[0078] It should be noted that, in this embodiment of the invention, when the guide pin 103 has completed the switching between the long and short tracks 4021 of the J-shaped groove 402 for the rotating center tube 1, the specific rotation direction of the rotating center tube 1 is not specifically limited in this embodiment of the invention, and can be selected according to the structural design. For example, when the structure of the J-shaped groove 402 is as follows: Figure 8 As shown, rotating the center tube 1 clockwise switches the guide pin 103 from the short track 4021 of the J-shaped groove 402 to the long track 4022; correspondingly, rotating the center tube 1 counterclockwise switches the guide pin 103 from the long track 4022 of the J-shaped groove 402 back to the short track 4021.

[0079] Furthermore, the split-type 7 packer provided in this embodiment of the invention limits the lifting distance of the central tube 1 by the upper dead point of the J-shaped groove 402 during the lifting process of the central tube 1.

[0080] In one embodiment, the split-type slip 7 packer provided by this invention has a plurality of circumferential limiting keys 102 arranged circumferentially at the upper end of the central tube 1; a plurality of through grooves 1002 are arranged on the inner wall of the slip seat 10, so that the slip seat 10 is circumferentially limited by the cooperation of the circumferential limiting keys 102 and the through grooves 1002, so that when the central tube 1 rotates, the slip seat 10 is driven to rotate by the cooperation of the circumferential limiting keys 102 and the through grooves 1002, and during the process of lifting or lowering the central tube 1, the circumferential limiting keys 102 slide in their corresponding through grooves 1002, that is, the relative movement between the two is guided by the cooperation of the circumferential limiting keys 102 and the through grooves 1002, so as to prevent relative rotation between the slip seat 10 and the central tube 1 during the process of lifting or lowering the central tube 1.

[0081] In one embodiment, refer to Figure 1 As shown, the straightening mechanism 300 includes: a friction reversing sleeve 4 and multiple friction reversing plates 3;

[0082] The friction reversing sleeve 4 is sleeved on the outside of the central tube 1, and its upper end is connected to the lower end of the slip limiting sleeve 66. The J-shaped groove 402 is provided on the inner wall of the friction reversing sleeve 4.

[0083] Multiple friction commutator segments 3 are spaced apart on the outer circumference of the friction commutator sleeve 4, and one end of the friction commutator segment 3 is fixed by a friction plate limiting sleeve 5 sleeved on the outside of the friction commutator sleeve 4, and the other end is fixed by a friction plate threaded sleeve 2 sleeved on the outside of the friction commutator sleeve 4.

[0084] Specifically, refer to Figure 7 As shown, a uniformly distributed mounting groove 401 is provided on the lower outer periphery of the friction commutator sleeve 4, and the friction commutator segment 3 is installed in the mounting groove 401.

[0085] In one embodiment, refer to Figure 1As shown, the split-type 7 packer of this embodiment also includes: a pressure ring 11;

[0086] The pressure ring 11 is positioned between the slip seat 10 and the sealing mechanism, with one end connected to the sealing mechanism and the other end connected to one end of the slip seat 10. Specifically, the pressure ring 11 is sleeved around the central tube 1, and refers to... Figure 3 As shown, the end face of the slip seat 10 is provided with evenly distributed threaded holes along the circumferential direction. The pressure ring 11 and the slip seat 10 are connected by a connector fixed in the threaded hole 1001 and the anchoring spiral groove 902.

[0087] In one embodiment, refer to Figure 1 As shown, the sealing mechanism includes: a plurality of rubber cylinders 12 sleeved outside the central tube 1, a spacer ring 13 disposed between adjacent rubber cylinders 12, and a support ring 14 disposed at the outer ends of the rubber cylinders 12 at both ends; specifically, the pressure ring 11 is disposed between the support ring 14 at the lower end and the slip seat 10.

[0088] The segmented slip packer structure provided in this invention effectively achieves simultaneous setting of each slip tooth with the outer sleeve, avoiding uneven setting of the segmented slips, improving anchoring reliability. Furthermore, simultaneous unsealing of the slips can be achieved by lifting the tubing string, reducing the probability of individual slip unsealing failure and significantly saving costs. This contributes to improving the reliability and efficiency of the slip packer, reducing the impact of frequent tool replacements after tool damage on production, and further saving costs.

[0089] Based on the same inventive concept, this invention also provides a method for using the above-mentioned segmented slip packer, characterized in that it includes:

[0090] The split-type slip packer is lowered into the pre-set position downhole along with the tubing string. Initial anchoring is achieved through the straightening mechanism. The center tube is then lifted and rotated to switch the guide pin from the short track of the J-shaped groove to its long track. The center tube is then lowered, causing the sealing mechanism and slip seat to move downwards. This allows the first mating body to engage with the reversing helical groove, which in turn drives the setting sleeve to rotate. Furthermore, the anchoring helical groove engages with the second mating body, causing the slip to expand radially to achieve anchoring between the slip and the outer casing. The center tube is then lowered further to seal the sealing mechanism with the outer casing.

[0091] When it is necessary to release the anchor, lift the central tube, which will move the upper connector and sealing mechanism upward to release the seal between the sealing mechanism and the outer sleeve. Then, continue to lift the central tube, which will move the slip seat upward. Through the cooperation of the first mating body and the reversing spiral groove, the setting sleeve will rotate in the opposite direction. Then, through the cooperation of the anchoring spiral groove and the second mating body, the slip will shrink radially to release the anchor between the slip and the outer sleeve. Then, rotate the central tube in the opposite direction to switch the guide pin back into the short track of the J-shaped groove so that the split slip packer returns to its initial state.

[0092] In one embodiment, the method of using the above-mentioned split-type slip packer further includes: after the split-type slip packer returns to its initial state, moving the split-type slip packer to the next position to repeat the setting and unsealing operations.

[0093] Regarding the usage method of the segmented slip packer in the above embodiments, the specific usage method has been described in detail in the specific embodiments regarding the structure of the segmented slip packer, and will not be elaborated here.

[0094] Based on the same inventive concept, this invention also provides an application of the above-mentioned segmented slip packer in the field of petroleum machinery technology, specifically for sealing the lower oil, gas, and water layers in oil wells, gas wells, and other mining wells.

[0095] It should be understood that the specific order or hierarchy of steps in the disclosed process is an example of an exemplary method. Based on design preferences, it should be understood that the specific order or hierarchy of steps in the process may be rearranged without departing from the scope of this disclosure. The appended method claims provide elements of various steps in an exemplary order and are not intended to limit the scope to the specific order or hierarchy described.

[0096] In the detailed description above, various features are combined together in a single embodiment to simplify this disclosure. This approach to disclosure should not be construed as reflecting an intention that embodiments of the claimed subject matter require more features than are explicitly stated in each claim. Rather, as reflected in the appended claims, the invention is presented with fewer features than all of the features in a single disclosed embodiment. Therefore, the appended claims are hereby explicitly incorporated into the detailed description, with each claim representing a separate preferred embodiment of the invention.

[0097] The foregoing description includes examples of one or more embodiments. It is certainly impossible to describe all possible combinations of components or methods in order to describe the above embodiments, but those skilled in the art will recognize that further combinations and arrangements of the various embodiments are possible. Therefore, the embodiments described herein are intended to cover all such changes, modifications, and variations that fall within the scope of the appended claims. Furthermore, the term "comprising" as used in the specification or claims is interpreted in a manner similar to the term "including," as interpreted when used as a conjunction in the claims. Additionally, the use of any term "or" in the specification of the claims is intended to mean "non-exclusive or."

Claims

1. A segmented slip packer, characterized in that, include: The sealing mechanism and anchoring mechanism are set in sequence; The setting mechanism includes: a slip seat and a setting sleeve; the anchoring mechanism includes: a plurality of slips spaced apart along the circumference of the setting sleeve; The setting sleeve has at least one directional spiral groove at one end and multiple anchoring spiral grooves at the other end; the lower end of the slip seat has a first mating body adapted to the directional spiral groove, the slip includes: a slip base and a second mating body disposed on the bottom surface of the slip base for adapting to the anchoring spiral groove, and the surface in contact with the second mating body is arc-shaped; As the slip seat moves downward under the action of external force, the first mating body and the steering spiral groove make the setting sleeve rotate. Then, the second mating body and the anchoring spiral groove drive the slip to move along the anchoring spiral groove, so that the slip expands radially to achieve anchoring between the slip and the outer sleeve. As the slip seat moves upward under the action of external force, the first mating body and the steering spiral groove cause the setting sleeve to rotate in the opposite direction, thereby driving the slip to reset.

2. The segmented slip packer as described in claim 1, characterized in that, The anchoring mechanism also includes: a fixing cylinder and a slip limiting sleeve; The fixing sleeve is sleeved on the setting sleeve and has multiple grooves along its circumference. The slip base is disposed in the grooves so as to limit the movement of the slip base through the grooves. The upper end of the locking sleeve is provided with a fixing cylinder groove, and the lower end is fixedly connected. The lower end of the fixing cylinder is set in the fixing cylinder groove.

3. The segmented slip packer as described in claim 1, characterized in that, The turning spiral groove has the opposite rotation direction to the anchoring spiral groove, and the helix angle of the edge guide groove line of the turning spiral groove is the same as that of the edge guide groove line of the anchoring spiral groove.

4. The segmented slip packer as described in claim 1, characterized in that, The second ligand is disposed in the middle position of the card matrix.

5. The segmented slip packer as described in claim 1, characterized in that, Multiple anchoring spiral grooves are evenly distributed along the outer wall of the setting sleeve; When multiple steering helical grooves are provided, the multiple steering helical grooves are evenly distributed along the outer wall of the setting sleeve.

6. The segmented slip packer as described in any one of claims 1-5, characterized in that, Also includes: Central tube, upper connector, sealing mechanism and uprighting mechanism; The upper connector, sealing mechanism, setting mechanism, anchoring mechanism, and straightening mechanism are arranged sequentially from top to bottom outside the central tube, and the upper end of the sealing mechanism is connected to the lower end of the upper connector, while the lower end is connected to the slip seat. The straightening mechanism is provided with a J-shaped groove including a long track and a short track. The central tube is provided with a guide pin that is adapted to the J-shaped groove. When the central tube is lifted and rotated, the movement track of the guide pin in the J-shaped groove can be changed. As the central tube is lowered along the long track of the J-shaped groove, it drives the upper connector and sealing mechanism to move downward, providing an external force for the downward movement of the slip seat, and causing the sealing mechanism to seal with the outer sleeve under the squeezing action of the upper connector and the slip seat; as the central tube is lifted along the long track of the J-shaped groove, it drives the upper connector and sealing mechanism to move upward, so that the sealing mechanism releases the seal between itself and the outer sleeve, and provides an external force for the upward movement of the slip seat.

7. The segmented slip packer as described in claim 6, characterized in that, During the process of lifting the central tube, the lifting distance of the central tube is limited by the upper dead point of the J-shaped groove.

8. The segmented slip packer as described in claim 6, characterized in that, The upper end of the central tube is provided with a plurality of circumferential limiting keys; the inner wall of the slip seat is provided with a plurality of through grooves, so as to circumferentially limit the slip seat by means of the cooperation between the circumferential limiting keys and the through grooves.

9. The segmented slip packer as described in claim 6, characterized in that, The straightening mechanism includes: a friction reversing sleeve and multiple friction reversing plates; The upper end of the friction reversing sleeve is connected to the lower end of the slip limiting sleeve, and the J-shaped groove is provided on the inner wall of the friction reversing sleeve; Multiple friction commutator segments are spaced apart on the outer circumference of the friction commutator sleeve, and one end of the friction commutator segment is fixed by a friction segment limiting sleeve sleeved outside the friction commutator sleeve, and the other end is fixed by a friction segment threaded sleeve sleeved outside the friction commutator sleeve.

10. The segmented slip packer as described in claim 9, characterized in that, Also includes: Pressure ring; The pressure ring is disposed between the slip seat and the sealing mechanism, with one end connected to the sealing mechanism and the other end connected to one end of the slip seat.

11. The segmented slip packer as described in claim 6, characterized in that, The sealing mechanism includes: multiple rubber tubes sleeved outside the central tube, spacer rings disposed between adjacent rubber tubes, and support rings disposed at the outer ends of the rubber tubes located at both ends.

12. A method of using a segmented slip packer as described in any one of claims 6-11, characterized in that, include: The split-type slip packer is lowered into the pre-set position downhole along with the tubing string. Initial anchoring is achieved through the straightening mechanism. The center tube is then lifted and rotated to switch the guide pin from the short track of the J-shaped groove to its long track. The center tube is then lowered, causing the sealing mechanism and slip seat to move downwards. This allows the first mating body to engage with the reversing helical groove, causing the setting sleeve to rotate. Subsequently, the anchoring helical groove engages with the second mating body, causing the slip to expand radially to achieve anchoring between the slip and the outer casing. The center tube is then lowered further to seal the sealing mechanism with the outer casing. When it is necessary to release the anchor, lift the central tube, which will move the upper connector and sealing mechanism upward to release the seal between the sealing mechanism and the outer sleeve. Then, continue to lift the central tube, which will move the slip seat upward. Through the cooperation of the first mating body and the reversing spiral groove, the setting sleeve will rotate in the opposite direction. Then, through the cooperation of the anchoring spiral groove and the second mating body, the slip will shrink radially to release the anchor between the slip and the outer sleeve. Then, rotate the central tube in the opposite direction to switch the guide pin back into the short track of the J-shaped groove, so that the split slip packer returns to its initial state.

13. The method of use as described in claim 12, characterized in that, Also includes: After the split-slip packer returns to its initial state, the split-slip packer is moved to the next position to repeat the setting and unsetting operations.

14. The application of the segmented slip packer as described in any one of claims 1-11 in the field of petroleum machinery technology.

Images