Packer convenient for releasing slip

Abstract

The packer comprises a plurality of slips which are evenly arranged in the circumferential direction of a mandrel, two cones are arranged at the two ends of each slip, a limiting sleeve is arranged on the outer side of each slip in a sleeved mode, each slip comprises a tooth-shaped part and a limiting part, each limiting part is arranged at the lower end of the corresponding tooth-shaped part, a plurality of through holes matched with the tooth-shaped parts are formed in each limiting sleeve, and each through hole is communicated with the corresponding cone. Reset springs are arranged between the slips and the limiting parts, a plurality of elastic metal strips are connected between the conical surfaces of the two cones, the elastic metal strips correspond to gaps between the slips and the through holes in the length direction in position, and the two cones are far away from each other to drive the elastic metal strips to retract to the inner sides of the gaps. According to the packer convenient for the slip to release, the elastic metal strip is connected between the two cones, and when the packer is released, the elastic metal strip passes through a gap between the slip and the through hole to clean solid particles, so that the slip smoothly retracts into the limiting sleeve under the action of the reset spring to finish the release, and the structure is simple and reliable.

Description

Technical Field

[0001] The utility model relates to the technical field of packers, in particular to a packer which is convenient for a plug to be released. Background Art

[0002] A packer is a downhole tool with elastic sealing elements that can be used to seal the annular space between tubings of various sizes and the wellbore, as well as between tubings, and to isolate the production layer, thereby controlling fluid production and protecting the casing.

[0003] During the use of the packer, there are often a lot of solid particles in the well fluid, which causes the solid particles to block the active channel of the slip, resulting in the slip not being able to be unstuck normally and the packer not being able to be unstuck in time, resulting in a well stuck accident. If the handling method is not appropriate, it will also cause damage and destruction to the structure of the original well string, causing unnecessary economic losses. Summary of the invention

[0004] The technical problem to be solved by the utility model is: in order to overcome the shortcomings in the prior art that, during the use of the packer, there are often many solid particles in the well fluid, which cause the solid particles to block the active channel of the slip, resulting in the slip not being able to be unstuck normally and the packer not being able to be unstuck in time, the utility model provides a packer that is easy to unstuck the slip.

[0005] The technical solution to be adopted by the utility model to solve its technical problems is: a packer that is easy to release the stuck cava, including a plurality of cava uniformly arranged along the circumference of the core shaft, two cones for driving the cava to open the inner wall surface of the interlocking casing are provided at both ends of the cava, and a limit sleeve is provided on the outer side of the cava, the cava includes a toothed portion and a limit portion, the limit portion is arranged at the lower end of the toothed portion, and the limit sleeve is provided with a plurality of through holes matching the toothed portion, a reset spring is provided between the cava and the limit portion, and a plurality of elastic metal strips are connected between the conical surfaces of the two cones, the elastic metal strips correspond to the gap position in the length direction between the cava and the through hole, the two cones approach each other to drive the elastic metal strip to extend to the outside of the gap, and the two cones move away from each other to drive the elastic metal strip to retract to the inside of the gap.

[0006] A limiting portion is provided on the slip to cooperate with the limiting sleeve to limit the distance that the slip extends out of the through hole. In addition, a reset spring is provided between the limiting portion and the limiting sleeve to facilitate the slip to retract into the packer when the packer is unstuck; when sealing, the two cones approach each other, the two cones squeeze the slip, and the slip is radially stretched, and the elastic metal strip arches toward the through hole along with the slip, and when the elastic metal strip passes through the gap between the slip and the through hole, the solid phase particles in the gap between the slip and the through hole are ejected; when unsealing, the two cones move away from each other, and when the gap between the slip and the through hole is not blocked, the slip can be retracted into the limiting sleeve by the force of the reset spring; if the slip is stuck, the elastic metal strip is dragged by the two cones to pass through the gap between the slip and the through hole, and the elastic metal strip is subjected to a large pulling force, which can cut or eject the solid phase particles in the gap, so that the slip can be smoothly retracted into the limiting sleeve.

[0007] Further, in order to ensure that the elastic metal strip bends toward the gap between the slip and the through hole, the elastic metal strip bends toward the limiting sleeve.

[0008] Furthermore, in order to prevent the arc-shaped elastic metal strip from pushing up the solid particles in the gap, a plurality of puncture needles are provided at intervals on one side of the elastic metal strip close to the limiting sleeve.

[0009] Furthermore, in order to prevent the elastic metal strip from tilting when bending, resulting in the position of the elastic metal strip not corresponding to the through-hole gap, two connecting rods are connected between the elastic metal strips on both sides of each slip, and the two connecting rods are respectively arranged on both sides of the elastic metal strip close to the cone.

[0010] Furthermore, when the connecting rod is close to the through hole, it corresponds to the gap position in the width direction between the slip and the through hole. The connecting rod can cut or push open the solid phase particles in the gap in the width direction between the slip and the through hole, so that the slip can be unstuck smoothly.

[0011] The beneficial effects of the utility model are as follows: the utility model provides a packer which is easy for the cava to be unstuck, and adopts an elastic metal strip connected between two cones. When the packer is unstuck, the elastic metal strip passes through the gap between the cava and the through hole to clean the solid phase particles, so that the cava can be smoothly retracted into the limit sleeve under the action of the reset spring, and the unstuck is completed. The structure is simple and reliable. BRIEF DESCRIPTION OF THE DRAWINGS

[0012] The utility model is further described below in conjunction with the accompanying drawings and embodiments.

[0013] Figure 1 It is a structural schematic diagram of the best embodiment of the utility model;

[0014] Figure 2 It is a cross-sectional schematic diagram of the best embodiment of the utility model;

[0015] Figure 3 It is a schematic diagram of the structure of the elastic metal strip and the connecting rod;

[0016] Figure 4 It is a schematic diagram of the structure of Kava.

[0017] In the figure: 1, core shaft, 2, slip, 21, toothed portion, 22, limiting portion, 3, cone, 4, limiting sleeve, 41, through hole, 5, elastic metal strip, 51, puncture needle, 6, connecting rod. DETAILED DESCRIPTION

[0018] Now the utility model is described in detail with reference to the accompanying drawings. This figure is a simplified schematic diagram, which only illustrates the basic structure of the utility model in a schematic manner, so it only shows the components related to the utility model.

[0019] like Figure 1-4 As shown, the utility model is a packer that is easy to release the stuck cava, including a plurality of cava 2 uniformly arranged along the circumference of the core shaft 1, two cones 3 for driving the cava 2 to open the inner wall of the engaging casing are provided at both ends of the cava 2, a limiting sleeve 4 is provided on the outer side of the cava 2, the cava 2 includes a toothed portion 21 and a limiting portion 22, the limiting portion 22 is provided at the lower end of the toothed portion 21, a plurality of through holes 41 cooperating with the toothed portion 21 are provided on the limiting sleeve 4, a reset spring is provided between the cava 2 and the limiting portion 22, a plurality of elastic metal strips 5 are connected between the conical surfaces of the two cones 3, the elastic metal strips 5 correspond to the gap position in the length direction between the cava 2 and the through holes 41, the two cones 3 approach each other to drive the elastic metal strip 5 to extend to the outside of the gap, and the two cones 3 move away from each other to drive the elastic metal strip 5 to retract to the inside of the gap.

[0020] The elastic metal strip 5 is bent toward the limiting sleeve 4 .

[0021] A plurality of puncture needles 51 are provided at intervals on one side of the elastic metal strip 5 close to the limiting sleeve 4 .

[0022] Two connecting rods 6 are connected between the elastic metal strips 5 on both sides of each slip 2 , and the two connecting rods 6 are respectively arranged on both sides of the elastic metal strip 5 close to the cone 3 .

[0023] When the connecting rod 6 is close to the through hole 41 , the position of the gap in the width direction between the slip 2 and the through hole 41 corresponds.

[0024] Working process:

[0025] When sealing, the two cones 3 are close to each other, and the two cones 3 squeeze the slip 2, stretching the slip 2 radially, and the elastic metal strip 5 arches along the slip 2 toward the through hole 41. When the elastic metal strip 5 passes through the gap between the slip 2 and the through hole 41, the solid phase particles in the gap between the slip 2 and the through hole 41 are ejected; when unsealing, the two cones 3 move away from each other. When the gap between the slip 2 and the through hole 41 is not blocked, the slip 2 can be retracted into the limit sleeve 4 by the force of the return spring; if the slip 2 is stuck, the elastic metal strip 5 and the connecting rod 6 are dragged by the two cones 3 to pass through the gap between the slip 2 and the through hole 41. The elastic metal strip 5 is subjected to a large pulling force, which can cut or eject the solid phase particles in the gap, so that the slip 2 can be smoothly retracted into the limit sleeve 4.

[0026] Directions and references (e.g., up, down, left, right, etc.) in the present invention may only be used to assist in the description of features in the accompanying drawings. Therefore, the following detailed description is not to be taken in a limiting sense, and the scope of the subject matter claimed is limited only by the attached claims and their equivalents.

[0027] Based on the above ideal embodiments of the utility model, the relevant staff can make various changes and modifications without departing from the scope of the utility model through the above description. The technical scope of this utility model is not limited to the contents of the specification, and its technical scope must be determined according to the scope of the claims.

Claims

1. A packer that facilitates the unblocking of a card, characterized in that: The invention comprises a plurality of slips (2) uniformly arranged along the circumference of a core shaft (1), two cones (3) for driving the slips (2) to open the inner wall surface of an engaging sleeve are provided at both ends of the slips (2), a limiting sleeve (4) is provided on the outer side of the slips (2), the slips (2) comprise a toothed portion (21) and a limiting portion (22), the limiting portion (22) is arranged at the lower end of the toothed portion (21), the limiting sleeve (4) is provided with a plurality of through holes (41) cooperating with the toothed portion (21), a return spring is provided between the slips (2) and the limiting portion (22), a plurality of elastic metal strips (5) are connected between the conical surfaces of the two cones (3), the elastic metal strips (5) correspond to the gap position in the length direction between the slips (2) and the through holes (41), the two cones (3) approach each other to drive the elastic metal strips (5) to extend to the outside of the gap, and the two cones (3) move away from each other to drive the elastic metal strips (5) to retract to the inside of the gap.

2. A packer for facilitating the release of a card as claimed in claim 1, characterized in that: The elastic metal strip (5) is bent towards the limiting sleeve (4).

3. A packer for facilitating the release of a card as claimed in claim 1, characterized in that: A plurality of puncture needles (51) are arranged at intervals on one side of the elastic metal strip (5) close to the limiting sleeve (4).

4. A packer for facilitating the release of a card as claimed in claim 1, characterized in that: Two connecting rods (6) are connected between the elastic metal strips (5) on both sides of each slip (2), and the two connecting rods (6) are respectively arranged on both sides of the elastic metal strip (5) close to the cone (3).

5. A packer for facilitating the release of a card as claimed in claim 4, characterized in that: When the connecting rod (6) is close to the through hole (41), the position corresponds to the gap in the width direction between the slip (2) and the through hole (41).

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