Woven elastic centralizer

Abstract

The utility model belongs to the field of petroleum equipment, and particularly relates to a woven elastic centralizer. Comprising end cylinders and centralizing strips arranged between the end cylinders, the centralizing strips are arch-shaped centralizing strips, auxiliary centralizing strips are further arranged on the centralizing strips, through grooves allowing the auxiliary centralizing strips to penetrate through are formed in the centralizing strips, and the through grooves are formed in the middles of the centralizing strips in the width direction. The auxiliary centralizing strips are arranged in a wave shape with two valley bottoms and one valley peak, and the directions of the valley bottoms of the auxiliary centralizing strips are opposite to the directions of the arcs of the centralizing strips. According to the centralizer, the auxiliary centralizing strips are additionally arranged on the basis of the centralizing strips, so that the overall elasticity of the centralizing strips is increased, the pressure resistance of the centralizing strips is improved, the service life of the centralizing strips is prolonged, and the purpose of prolonging the service life of the whole centralizer is achieved.

Description

TECHNICAL FIELD

[0001] The utility model belongs to petroleum equipment field, especially relate to a woven type elastic centralizer. BACKGROUND

[0002] The centralizer is used for keeping the casing in the wellbore in the middle to improve the cementing quality. The centralizer is divided into elastic centralizer and rigid centralizer, and the elastic centralizer is more suitable for the oil and gas field with large change in well diameter or large inclination because the centralizer strip has elasticity. The existing elastic centralizer adopts the structure that multiple elastic centralizer strips are inserted between two end cylinders, and the two end cylinders are integral steel rings or steel rings formed by spliced hinge pieces, and the integral steel ring is more convenient for the insertion of the casing in use.

[0003] The existing elastic centralizer strip is mostly single or double bow-shaped metal centralizer strip, and the centralizer strip can effectively utilize the elasticity of metal and the elasticity of the shape to realize better reset, thereby meeting the purpose of keeping the casing in the middle.

[0004] The above structure realizes elastic reset to a certain extent, but with the increase of use cycle or pressure, the centralizer strip is prone to straightening, thereby losing the effect and reducing the service life. TECHNICAL SOLUTION

[0005] The utility model provides a woven type elastic centralizer with reasonable design, simple structure, convenient processing and the effect of effectively improving the resilience of the centralizer strip.

[0006] In order to achieve the above purpose, the utility model adopts the technical scheme that the utility model provides a woven type elastic centralizer, which comprises end cylinders and a centralizer strip arranged between the end cylinders, the centralizer strip is a bow-shaped centralizer strip, an auxiliary centralizer strip is further arranged on the centralizer strip, a through groove for the auxiliary centralizer strip to pass through is arranged on the centralizer strip, the through groove is arranged at the middle of the width direction of the centralizer strip, the auxiliary centralizer strip is arranged in a wave shape with two trough bottoms and one trough peak, and the trough bottoms of the auxiliary centralizer strip are arranged in opposite directions to the arc direction of the centralizer strip.

[0007] Preferably, the centralizer strip is a double-bow centralizer strip.

[0008] Preferably, the end cylinder comprises at least three arc-shaped hinge pieces axially connected to each other, the arc-shaped hinge pieces are arranged to form an end cylinder structure, hoop rings are arranged on the two sides of the arc-shaped hinge pieces, positioning pins are inserted between the hoop rings of the two arc-shaped hinge pieces, the hoop rings are arranged at intervals on the two sides of the arc-shaped hinge pieces, a notch is arranged on any hoop ring, and a spring protrusion matched with the notch is arranged on the positioning pin.

[0009] As preferred, the notches on the hoop rings of the two arc-shaped hinge pieces axially connected to each other are arranged in opposite staggered manner.

[0010] As preferred, one end of the positioning pin is provided with a limiting cap, and the diameter of the limiting cap is greater than the hole diameter of the hoop ring.

[0011] As preferred, the spring protrusion is chamfered away from one end of the limiting cap.

[0012] Compared with the prior art, the utility model has the advantages and positive effects that:

[0013] 1. The utility model provides a kind of braided elastic centralizer, by increasing auxiliary centralizing strip on the basis of centralizing strip, the overall elasticity of centralizing strip becomes larger, so as to improve the pressure resistance and service life of centralizing strip, so as to reach the purpose of improving the service life of entire centralizer. BRIEF DESCRIPTION OF DRAWINGS

[0014] In order to more clearly illustrate the technical scheme of the embodiments of the utility model, the drawings needed to be used in the embodiment description will be simply introduced as follows, and obviously, the drawings in the following description are some embodiments of the utility model, and for those skilled in the art, other drawings can also be obtained according to these drawings without creative labor.

[0015] Fig. 1 The structure schematic view of braided elastic centralizer provided for embodiment 1 is shown in the drawing.

[0016] Fig. 2 The front view of braided elastic centralizer provided for embodiment 1 is shown in the drawing.

[0017] Fig. 3 The structure schematic view of arc-shaped hinge piece provided for embodiment 1 is shown in the drawing.

[0018] Fig. 4 The structure schematic view of positioning pin provided for embodiment 1 is shown in the drawing.

[0019] In the above drawings, 1, end cylinder;11, arc-shaped hinge piece;12, hoop ring;121, notch;2, centralizing strip;21, through slot;22, auxiliary centralizing strip;3, positioning pin;31, spring protrusion;32, limiting cap. DETAILED DESCRIPTION

[0020] In order to more clearly illustrate the technical scheme of the embodiments of the utility model, the drawings needed to be used in the embodiment description will be simply introduced as follows, and obviously, the drawings in the following description are some embodiments of the utility model, and for those skilled in the art, other drawings can also be obtained according to these drawings without creative labor.

[0021] Many specific details are set forth in the following description in order to provide a full understanding of the present invention. However, the present invention may also be implemented in other ways different from those described herein. Therefore, the present invention is not limited to the specific embodiments disclosed in the following specification.

[0022] Example 1, such as Figs. 1-4 As shown, this embodiment aims to provide a braided elastic centralizer with a longer service life. Considering that the main reason for the damage of existing elastic centralizers is that the centralizer bar 2 loses its elasticity under long-term pressure or high pressure, increasing elasticity is a solution to resist pressure. Therefore, in order to achieve the above objective, the braided elastic centralizer provided in this embodiment includes an end cylinder 1 and a centralizer bar 2 disposed between the end cylinders 1. The centralizer bar 2 is an arc-shaped centralizer bar 2. The above structure is a common structure of existing elastic centralizers, so it will not be described in detail in this embodiment.

[0023] To increase the elasticity of the straightening strip 2, in this embodiment, an auxiliary straightening strip 22 is also provided on the straightening strip 2. A through groove 21 for the auxiliary straightening strip 22 to pass through is provided on the straightening strip 2. The through groove 21 is located in the middle of the width direction of the straightening strip 2, that is, the long side direction of the auxiliary straightening strip 22 is consistent with the long side direction of the straightening strip 2, but its length is less than the length of the straightening strip 2. In this embodiment, in order to increase the elasticity of the auxiliary straightening strip 22, the auxiliary straightening strip 22 is arranged in a wave shape with two valley bottoms and one valley peak. At the same time, the valley bottoms of the auxiliary straightening strip 22 are oriented in the opposite direction to the arc shape of the straightening strip 2.

[0024] In this way, by using the different arc angles of the straightening strip 2 and the auxiliary straightening strip 22, the straightening strip 2 and the auxiliary straightening strip 22 interact with each other, thereby increasing the elasticity and thus increasing their compressive strength, thereby achieving the purpose of improving service life.

[0025] To further improve the elasticity of the straightening strip 2, in this embodiment, the straightening strip 2 is a double-arch straightening strip 2.

[0026] In view of another reason for the reduced service life of the elastic centralizer, which is the damage of the positioning pin 3, the embodiment also makes corresponding improvements in this regard. Specifically, the existing end cylinder 1 includes at least three arc-shaped hinge pieces 11 axially connected to each other, and the arc-shaped hinge pieces 11 form the structure of the end cylinder 1. A hoop 12 is arranged on both sides of the arc-shaped hinge piece 11, and a plurality of hoops 12 are arranged at intervals on each side of the arc-shaped hinge piece 11. The hoops 12 between the two arc-shaped hinge pieces 11 can be inserted into each other to form a coaxial structure. Therefore, the positioning pin 3 is inserted between the hoops 12 between the two arc-shaped hinge pieces 11, which is the reason why this type of elastic centralizer is called a woven elastic centralizer. The traditional positioning pin is inserted into the hoop 12 in the form of a nail, and then the protruding part is bent to form a limiting and fixing part. Since the bent part is exposed to the outside, it will be broken due to friction. Therefore, in order to solve the above problems, in the embodiment, a notch 121 is arranged on any hoop 12 of the arc-shaped hinge piece 11, and a spring protrusion 31 is arranged on the positioning pin 3. In this way, the position limited by the positioning pin 3 is changed from the outside of the hoop 12 to the inside of the hoop 12, avoiding the setting of the bent part, thereby avoiding friction and improving the service life.

[0027] In order to ensure the fixing and limiting effect, in the embodiment, the notches 121 on the hoops 12 of the two arc-shaped hinge pieces 11 axially connected to each other are relatively staggered. The purpose of this is to achieve up-down staggered limiting and improve the fixing effect. It should be noted that the width of the notch 121 can be greater than the width of the spring protrusion 31 to facilitate a certain angle of movement.

[0028] In order to facilitate the insertion of the positioning pin 3, a limiting cap 32 is arranged at one end of the positioning pin 3, and the diameter of the limiting cap 32 is greater than the hole diameter of the hoop 12. At the same time, the end of the spring protrusion 31 away from the limiting cap 32 is chamfered. In this way, since the chamfer facilitates insertion, and the limiting cap 32 limits it, the chamfer direction is not easy to fall off, thereby achieving the purpose of easy insertion and not easy to fall off.

[0029] The above is only a preferred embodiment of the present application, and is not intended to limit the present application in other forms. Any person skilled in the art can modify or change the above disclosed technical content to equivalent embodiments applied to other fields, but any simple modification, equivalent change and modification made on the basis of the technical essence of the present application to the above embodiments shall fall within the protection scope of the present application.

Claims

1. A braided elastic centralizer comprising end cylinders and centralizer strips disposed between the end cylinders, the centralizer strips being arcuate centralizer strips, characterized in that, The righting strip is further provided with an auxiliary righting strip, the righting strip is provided with a through slot for the auxiliary righting strip to pass through, the through slot is arranged at the middle of the righting strip in the width direction, the auxiliary righting strip is arranged in a wave shape with two troughs and one peak, and the troughs of the auxiliary righting strip are arranged in a direction opposite to the arc direction of the righting strip.

2. A woven elastic centralizer according to claim 1, wherein, The righting strip is a double-arch righting strip.

3. A woven elastic centralizer according to claim 2, wherein, The end cylinder comprises at least three arc-shaped hinge pieces axially connected to each other, the arc-shaped hinge pieces are arranged to form an end cylinder structure, hoops are arranged on both sides of the arc-shaped hinge pieces, positioning pins are inserted between the hoops between two arc-shaped hinge pieces, the hoops are arranged on both sides of the arc-shaped hinge pieces at intervals, a notch is arranged on any hoop, and a spring protrusion matched with the notch is arranged on the positioning pin.

4. A woven elastic centralizer according to claim 3, wherein, The notches on the hoops of the two arc-shaped hinge pieces axially connected to each other are arranged in opposite staggered modes.

5. A woven elastic centralizer according to claim 4, wherein, One end of the positioning pin is provided with a limiting cap, and the diameter of the limiting cap is greater than the hole diameter of the hoop.

6. A woven elastic centralizer according to claim 5, wherein, The spring protrusion is chamfered at an end away from the limiting cap.

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