Anchoring seal in packer

Abstract

The utility model discloses an anchoring seal in a packer, which comprises a through anchoring mandrel and a protective sleeve in threaded connection with the anchoring mandrel, the anchoring mandrel is sleeved with an anchoring slip, one end of the anchoring slip is inserted into the protective sleeve, and the anchoring slip is used for being in threaded connection with the packer and stopping rotation relative to the anchoring mandrel. The protective sleeve is provided with a limiting screw for limiting the anchoring slip; the anchoring core shaft is in threaded connection with an upper packing seat abutting against the anchoring slip, the anchoring core shaft is sleeved with a sealing assembly, the tail end of the anchoring core shaft is in threaded connection with a lower packing seat, the lower packing seat and the upper packing seat press the sealing assembly, and the sealing assembly is used for being connected to a packer in a sealed mode; the problems that in the prior art, an anchoring slip and a packer cannot be separated due to the fact that the threaded connection position of the anchoring slip and the packer easily enters mud, and the anchoring slip is relatively fixed to the position of the anchoring slip and cannot be separated when the anchoring slip is screwed into the packer when a tubular column is pressed down or lifted up are solved.

Description

Technical Field

[0001] This utility model relates to the field of downhole completion tools technology, and in particular to an anchoring seal in a packer. Background Technology

[0002] During well completion operations, the tubing is disassembled or assembled relative to the packer. The packer is sealed by an anchoring seal, which is connected to the packer by anchor slips threaded together. The sealing assembly achieves an internal seal with the packer. If the tubing needs to be removed after the packer is set, the anchor slips need to be detached from the packer.

[0003] In existing anchoring sealing structures, the anchoring slips are relatively fixed, requiring the finding of a balance point when releasing them. For example, if the tubing is pressed down and rotated during construction, the anchoring slips will automatically screw into the packer and will not come off. However, if they are lifted too much, the rotational torque will be too large, making it difficult to release them. Only after multiple attempts can the balance point be found before the operation can proceed, wasting a lot of time.

[0004] Additionally, mud can enter the threaded connection between the anchor slip and the packer, causing the anchor slip and packer to become unable to detach. Utility Model Content

[0005] The purpose of this invention is to provide an anchoring seal within a packer, solving the problems in the prior art where the anchoring slips and the threaded connection of the packer are prone to entering mud and becoming unable to detach, and where the anchoring slips are relatively fixed in position and cannot detach when screwed into the packer when the tubing is pressed down or lifted.

[0006] To achieve the above objectives, this utility model provides the following technical solution:

[0007] An anchoring seal within a packer includes a through anchoring mandrel and a protective sleeve threaded onto the anchoring mandrel. An anchoring slip, one end of which is inserted into the protective sleeve, is fitted onto the anchoring mandrel. The anchoring slip is threaded onto the packer and prevents rotation relative to the anchoring mandrel. The protective sleeve has a limiting screw that limits the anchoring slip. An upper packing seat, which abuts against the anchoring slip, is threaded onto the anchoring mandrel. A sealing assembly is fitted onto the anchoring mandrel. A lower packing seat is threaded onto the end of the anchoring mandrel. The lower packing seat and the upper packing seat press against the sealing assembly, which is used for sealing connection to the packer.

[0008] Preferably, the anchoring slip includes a sleeve and a boss at the end of the sleeve. The boss has a limiting ring groove that mates with the limiting screw. The sleeve has a first threaded portion for connecting to the packer. The sleeve has a plurality of limiting slots evenly distributed circumferentially.

[0009] Preferably, the anchoring mandrel comprises a pipe body, the pipe body is provided with a second threaded part connected with the protective sleeve; the pipe body is provided with a stepped part for slidingly mounting the sleeve body, the stepped part is provided with a plurality of limiting protrusions uniformly distributed in the circumferential direction, the limiting protrusions are clamped into the limiting grooves; the pipe body is provided with a third threaded part connected with the upper packing seat and a fourth threaded part connected with the lower packing seat; the pipe body is provided with a sealing section between the third threaded part and the fourth threaded part, and the sealing assembly is sleeved on the sealing section.

[0010] Preferably, the sealing assembly comprises first rubber tubes and second rubber tubes which are symmetrically arranged and sleeved on the sealing section, and a sealing ring is arranged between two adjacent second rubber tubes, one of the first rubber tubes abuts against the upper packing seat, and the other first rubber tube abuts against the lower packing seat.

[0011] Preferably, the first rubber tube is provided with a first guide part which is inclined outward at an end away from the sealing ring, and the second rubber tube is provided with a second guide part which is inclined outward at an end away from the sealing ring.

[0012] Preferably, an end of the protective sleeve is provided with a sealing inclined surface which abuts against and seals the packer.

[0013] Preferably, the lower packing seat is provided with a stepped hole, an inner threaded hole connected with the anchoring mandrel is arranged on an inner wall of a large hole of the stepped hole, and an end of the lower packing seat is provided with a through force receiving notch.

[0014] Beneficial effects:

[0015] When the anchoring slips are installed, the anchoring mandrel is used to stop rotation of the anchoring slips, the anchoring slips are threadedly connected into the packer, and the anchoring slips are connected to the packer in a sealed manner through the sealing assembly; when the anchoring slips and the packer need to be separated, the anchoring mandrel is driven to rotate and move, the anchoring slips are sheared from the limiting screws, the anchoring slips can slide relative to the anchoring mandrel and become in a floating state, and thus an acting force generated when the tubing is disassembled relative to the packer cannot directly act on the anchoring slips, so that the anchoring slips cannot be rotated into the packer again and cannot be separated from the packer;

[0016] Meanwhile, the protective sleeve and the packer are used to realize mud isolation, mud cannot enter a threaded connection part of the anchoring slips and the packer, relative rotation flexibility is ensured, and the anchoring slips cannot be separated from the packer. BRIEF DESCRIPTION OF DRAWINGS

[0017] Figure 1 It is a three-dimensional structure schematic view of an embodiment of the utility model;

[0018] Figure 2 It is a sectional structure schematic view of an embodiment of the utility model;

[0019] Figure 3 It is the structural schematic view of the anchoring mandrel in the embodiment of the utility model;

[0020] Figure 4 It is the structural schematic view of the anchoring slip in the embodiment of the utility model;

[0021] Figure 5 It is the structural schematic view of the lower packing seat in the embodiment of the utility model;

[0022] In Figures 1 to 5 In the embodiment of the utility model, the correspondence between the component name or line and the figure number is as follows:

[0023] The anchoring mandrel 1, the pipe body 101, the second threaded part 102, the stepped part 103, the limiting convex strip 104, the third threaded part 105, the fourth threaded part 106, the sealing section 107, the protective sleeve 2, the sealing inclined surface 20, the anchoring slip 3, the sleeve body 31, the boss 32, the limiting ring groove 33, the first threaded part 34, the limiting clamping groove 35, the limiting screw 4, the upper packing seat 5, the lower packing seat 6, the stepped hole 61, the internal threaded hole 62, the force-giving notch 63, the sealing assembly 7, the first rubber cylinder 71, the second rubber cylinder 72, the sealing ring 73, the first guide part 74, the second guide part 75. Specific implementation

[0024] The technical scheme in the embodiment of the utility model will be clearly and completely described below in combination with the drawings in the embodiment of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, rather than all the embodiments.

[0025] Referring to Figures 1-5 It is proposed in the embodiment of the utility model that the anchoring sealing in the packer comprises a through anchoring mandrel 1 and a protective sleeve 2 which is threadedly connected to the anchoring mandrel 1. The anchoring mandrel 1 is sleeved with an anchoring slip 3 with one end inserted into the protective sleeve 2. The anchoring slip 3 is used to be threadedly connected to the packer and is rotationally stopped relative to the anchoring mandrel 1. The protective sleeve 2 is provided with a limiting screw 4 for limiting the anchoring slip 3. The limiting screw 4 is used to limit the axial sliding in the initial state assembled into the packer, while the anchoring slip 3 is threadedly connected to the packer when assembled. Meanwhile, the anchoring mandrel 1 is threadedly connected with an upper packing seat 5 abutting against the anchoring slip 3. The anchoring mandrel 1 is sleeved with a sealing assembly 7. The anchoring mandrel 1 is threadedly connected with a lower packing seat 6. The lower packing seat 6 and the upper packing seat 5 press the sealing assembly 7. The sealing assembly 7 is used to be sealingly connected to the packer. The sealing assembly 7 is expanded after being pressed by the lower packing seat 6 and the upper packing seat 5, so that the sealing assembly 7 forms a good sealing with the packer. Meanwhile, the anchoring slip 3 is limited by the upper packing seat 5, that is, the anchoring slip 3 can only slide towards one side of the protective sleeve 2.

[0026] The protective sleeve 2 is matched with the packer to block the mud, and the anchor slip 3 is protected at the threaded connection with the packer to avoid the threaded connection being filled with mud and unable to rotate.

[0027] Specifically, when the tubing is disassembled, the anchor slip 3 needs to be separated from the packer. The anchor slip 3 is rotated and moved relative to the anchor core shaft 1, so that the anchor slip 3 is rotated and separated from the packer and shearing force is applied to the limiting screw 4, so that the limiting screw 4 is broken, and the anchor slip 3 is floated relative to the anchor core shaft 1. When the rotating torque continues to be generated during disassembly, the anchor slip 3 is not stressed, so that the anchor slip 3 and the packer are not connected again, and the separation state is maintained.

[0028] The anchor slip 3 includes a sleeve 31 and a boss 32 provided at an end of the sleeve 31. The boss 32 is provided with a limiting ring groove 33 matched with the limiting screw 4. The sleeve 31 is provided with a first threaded portion 34 for connecting to the packer. The sleeve 31 is provided with a plurality of limiting clamping grooves 35 uniformly distributed in the circumferential direction. The sleeve 31 structure enables the entire anchor slip 3 to slide on the anchor core shaft 1. The limiting ring groove 33 cooperates with the limiting screw 4 to limit the initial installation position and axially slide. Only when the external force is sufficient to move the anchor slip 3, the limiting ring groove 33 shears the limiting screw 4 to move. The first threaded portion 34 is used for threaded connection with the packer. The limiting clamping groove 35 cooperates with the anchor core shaft 1 to realize rotation stopping.

[0029] The anchor core shaft 1 includes a pipe body 101. The pipe body 101 is provided with a second threaded portion 102 connected to the protective sleeve 2. The protective sleeve 2 is tightly connected to the second threaded portion 102 and ensures that the protective sleeve 2 tightly abuts against the packer. The pipe body 101 is provided with a stepped portion 103 on which the sleeve 31 is slidingly installed. The stepped portion 103 is provided with a plurality of limiting protrusions 104 uniformly distributed in the circumferential direction. The limiting protrusions 104 are clamped into the limiting clamping grooves 35. The limiting protrusions 104 and the limiting clamping grooves 35 cooperate to realize rotation stopping of the anchor slip 3 relative to the anchor core shaft 1, but can be guided to slide. The pipe body 101 is provided with a third threaded portion 105 connected to the upper packing seat 5 and a fourth threaded portion 106 connected to the lower packing seat 6. The pipe body 101 is provided with a sealing section 107 located between the third threaded portion 105 and the fourth threaded portion 106. The sealing assembly 7 is sleeved on the sealing section 107. The sealing assembly 7 is extruded and expanded by the threaded connection of the upper packing seat 5 and the lower packing seat 6, so as to ensure that the sealing assembly 7 abuts against the packer to reliably seal.

[0030] The sealing assembly 7 comprises a first rubber tube 71 and a second rubber tube 72 which are symmetrically arranged on the sealing section 107, and a sealing ring 73 is arranged between two adjacent second rubber tubes 72, one first rubber tube 71 abuts against the upper packing seat 5, and the other first rubber tube 71 abuts against the lower packing seat 6, and the first rubber tube 71 adopts a cylindrical structure and expands in the middle when being pressed, so that the sealing ring 73 and the rubber tube can reliably contact the packer for sealing.

[0031] An outwardly inclined first guide part 74 is arranged at one end of the first rubber tube 71 away from the sealing ring 73, and an outwardly inclined second guide part 75 is arranged at one end of the second rubber tube 72 away from the sealing ring 73, so that the first guide part 74 and the second guide part 75 can more easily realize the insertion and expansion state between the rubber tubes, and the expansion direction is outward.

[0032] Specifically, a sealing inclined surface 20 which abuts against and seals the packer is arranged at the end of the protective sleeve 2, and the sealing state during abutment is ensured through the sealing inclined surface 20, especially during the rotation of the anchoring mandrel 1,

[0033] Meanwhile, the rotation of the anchoring mandrel 1 is always through the lower packing seat 6 as a connecting point, the lower packing seat 6 is provided with a stepped hole 61, an inner threaded hole 62 for connecting the anchoring mandrel 1 is arranged on the inner wall of the large hole of the stepped hole 61, and a through force receiving notch 63 is arranged at the end of the lower packing seat 6, the anchoring mandrel 1 is fastened and connected through the inner threaded hole 62, and the force receiving notch 63 can be matched with a tool to drive the anchoring mandrel 1 to rotate.

[0034] It should be noted that the cooperation between the anchoring sealing and the packer, and the operation structure of the reliable separation between the anchoring slips 3 and the packer are mature technologies, and the embodiment only improves the related structure for improving the reliable separation between the anchoring slips 3 and the packer after improving the anchoring sealing.

[0035] In the present application, unless otherwise clearly specified and limited, the terms "mounting", "connection", "connecting", "fixing" and the like should be understood in a broad sense, for example, can be fixed connection, can also be detachable connection, or integrated; can be mechanical connection, can also be electrical connection; can be directly connected, can also be indirectly connected through an intermediate medium, can be the internal communication of two elements or the interaction relationship between two elements. For ordinary skilled in the art, the specific meaning of the above terms in the present application can be understood according to the specific circumstances.

[0036] In the description of the utility model, it is necessary to explain that the orientation or position relation indicated by the terms "center", "upper", "lower", "left", "right", "inner", "outer" and the like is the orientation or position relation based on the drawing shown, or is the orientation or position relation of the utility model product when it is usually placed, and is only for the convenience of describing the utility model and simplifying the description, and therefore cannot be understood as indicating or implying that the device or element indicated must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as limiting the utility model. In addition, the terms "first", "second" and the like are only used for distinguishing description, and cannot be understood as indicating or implying relative importance.

[0037] It is obvious for those skilled in the art that the utility model is not limited to the details of the above-mentioned exemplary embodiments, and can be realized in other specific forms without departing from the spirit or basic characteristics of the utility model. Therefore, no matter from which point of view, the embodiments should be regarded as exemplary and non-limiting, and the scope of the utility model is defined by the appended claims rather than the above description, and therefore all changes falling within the meaning and scope of the equivalent elements of the claims are intended to be included in the utility model. Any figure reference in the claims should not be regarded as limiting the claims involved.

Claims

1. An anchoring seal within a packer, characterized by: The anchor core shaft (1) is provided with an anchor slip (3) inserted into the protective sleeve (2), the anchor slip (3) is used for being threadedly connected to the packer and being rotationally fixed relative to the anchor core shaft (1), and the protective sleeve (2) is provided with a limiting screw (4) limiting the anchor slip (3); The anchor core shaft (1) is provided with an upper packing seat (5) abutting against the anchor slip (3), the anchor core shaft (1) is provided with a sealing assembly (7), and the tail end of the anchor core shaft (1) is provided with a lower packing seat (6), the lower packing seat (6) and the upper packing seat (5) compress the sealing assembly (7), and the sealing assembly (7) is used for being sealingly connected to the packer.

2. An anchoring seal within a packer as defined in claim 1, characterized in that: The anchor slip (3) comprises a sleeve body (31) and a boss (32) arranged at the end of the sleeve body (31), the boss (32) is provided with a limiting ring groove (33) matched with the limiting screw (4), the sleeve body (31) is provided with a first threaded part (34) used for being connected to the packer, and the sleeve body (31) is provided with a plurality of limiting clamping grooves (35) uniformly distributed in the circumferential direction.

3. An anchoring seal within a packer as defined in claim 2, wherein: The anchor core shaft (1) comprises a pipe body (101), and the pipe body (101) is provided with a second threaded part (102) connected to the protective sleeve (2); The pipe body (101) is provided with a stepped part (103) slidingly mounting the sleeve body (31), the stepped part (103) is provided with a plurality of limiting convex strips (104) uniformly distributed in the circumferential direction, and the limiting convex strips (104) are clamped into the limiting clamping grooves (35); The pipe body (101) is provided with a third threaded part (105) connected to the upper packing seat (5) and a fourth threaded part (106) connected to the lower packing seat (6); The pipe body (101) is provided with a sealing section (107) between the third threaded part (105) and the fourth threaded part (106), and the sealing assembly (7) is sleeved on the sealing section (107).

4. An anchoring seal within a packer as defined in claim 3, wherein: The sealing assembly (7) comprises first rubber cylinders (71) and second rubber cylinders (72) symmetrically arranged and sleeved on the sealing section (107), a sealing ring (73) is arranged between adjacent two second rubber cylinders (72), one of the first rubber cylinders (71) abuts against the upper packing seat (5), and the other first rubber cylinder (71) abuts against the lower packing seat (6).

5. An anchoring seal within a packer as defined in claim 4, wherein: One end of the first rubber cylinder (71) away from the sealing ring (73) is provided with a first guide part (74) inclined outward, and one end of the second rubber cylinder (72) away from the sealing ring (73) is provided with a second guide part (75) inclined outward.

6. An anchoring seal within a packer as claimed in any one of claims 1 to 5, characterized in that: The end of the protective sleeve (2) is provided with a sealing inclined surface (20) abutting against the packer.

7. An anchoring seal within a packer as defined in claim 6, wherein: The lower packing seat (6) is provided with a stepped hole (61), an inner threaded hole (62) connected to the anchor core shaft (1) is arranged on the inner wall of the large hole of the stepped hole (61), and the end of the lower packing seat (6) is provided with a through force receiving notch (63).

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