Integral elastic centralizer

Abstract

The utility model belongs to the field of petroleum equipment, and particularly relates to an integral elastic centralizer. Comprising two steel rings arranged in a spaced mode and elastic centralizing strips arranged between the two steel rings, the elastic centralizing strips are annularly and evenly distributed between the two steel rings, jackscrew pipes are arranged on the side walls of the steel rings, through holes communicated with the jackscrew pipes are formed in the steel rings, jackscrews are connected into the jackscrew pipes in a threaded mode, and the through holes are communicated with the jackscrew pipes. The jackscrew pipes are annularly and evenly distributed on the side wall of the steel ring. According to the integral elastic centralizer, the jackscrew pipe is additionally arranged on the side wall of the steel ring, the fixing effect of the jackscrew is ensured by utilizing the length of the jackscrew pipe, so that the integral elastic centralizer has a binding and fixing function, the requirement for stability is met under the condition that a check ring is omitted, and meanwhile, the integral elastic centralizer is simple in structure, ingenious in design and convenient to use. The method is suitable for large-scale popularization.

Description

Technical Field

[0001] This utility model belongs to the field of petroleum equipment, and in particular relates to an integral elastic centralizer. Background Technology

[0002] Centralizers are used in oil and gas fields to keep the casing centered in the wellbore during casing installation, thereby improving cementing quality. Centralizers are divided into flexible and rigid types. Flexible centralizers, due to their elasticity, are more suitable for oil and gas fields with large variations in well diameter or steep inclination. Existing flexible centralizers employ a structure where multiple flexible centralizing bars are inserted between two end cylinders. The two end cylinders are either integral steel rings or steel rings formed by spliced ​​hinged plates. Integral steel rings facilitate casing insertion during use.

[0003] Existing centralizers require a stop ring to restrict their sliding on the inner sleeve during use. While the stop ring ensures the stability of the centralizer, it also increases the cost of using it. Therefore, how to ensure the stability of the centralizer without the stop ring is one of the current research directions for centralizers. Utility Model Content

[0004] This invention addresses the technical problem of increased costs caused by the need for a stop ring to stabilize existing centralizers. It proposes an integrated elastic centralizer with a reasonable design, simple structure, and the ability to achieve stability without the aid of a stop ring.

[0005] To achieve the above objectives, the technical solution adopted by this utility model is as follows: This utility model provides an integral elastic straightener, including two spaced steel rings and an elastic straightening strip disposed between the two steel rings. The elastic straightening strip is evenly distributed in a ring between the two steel rings. A set screw tube is provided on the side wall of the steel ring. A through hole communicating with the set screw tube is provided on the steel ring. A set screw is internally threaded into the set screw tube. The set screw tube is evenly distributed in a ring on the side wall of the steel ring.

[0006] Preferably, the inner wall of the steel ring is provided with serrated protrusions, which are evenly distributed in a ring on the inner wall of the steel ring.

[0007] Preferably, the inner wall of the steel ring is provided with a groove, the groove being C-shaped, and the side wall of the steel ring is provided with an extension hole that matches the groove. A retaining spring is provided in the groove, and both ends of the retaining spring protrude through the extension hole.

[0008] Preferably, the grooves are arranged on the upper and lower sides of the serrated protrusion, and the two grooves are staggered.

[0009] Preferably, the elastic straightening bar includes a connecting part connected to the steel ring and an arc-shaped part disposed between the connecting parts, wherein the lengths of the connecting parts on both sides of the arc-shaped part are different, and adjacent elastic straightening bars are staggered.

[0010] Compared with the prior art, the advantages and positive effects of this utility model are as follows:

[0011] 1. This utility model provides an integral elastic centralizer. By adding a top screw tube to the side wall of the steel ring, the length of the top screw tube is used to ensure the fixing effect of the top screw, so that the integral elastic centralizer itself has the function of binding and fixing. Thus, the need for stability is met without the need for a stop ring. At the same time, this utility model has a simple structure and ingenious design, and is suitable for large-scale promotion and use. Attached Figure Description

[0012] To more clearly illustrate the technical solutions of the embodiments of this utility model, the drawings used in the description of the embodiments will be briefly introduced below. Obviously, the drawings described below are some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0013] Figure 1 This is a schematic diagram of the integral elastic centralizer provided in Example 1;

[0014] Figure 2 A front view of the integral elastic centralizer provided in Embodiment 1;

[0015] In the above figures, 1 is the steel ring; 11 is the set screw tube; 12 is the groove; 13 is the protruding hole; 14 is the serrated protrusion; 2 is the elastic straightening strip; 21 is the connecting part; and 22 is the arc-shaped part. Detailed Implementation

[0016] To better understand the above-mentioned objectives, features, and advantages of this utility model, the present utility model will be further described below with reference to the accompanying drawings and embodiments. It should be noted that, unless otherwise specified, the embodiments and features described in these embodiments can be combined with each other.

[0017] 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.

[0018] Example 1, such as Figure 1 , Figure 2As shown, this embodiment aims to reduce the cost of using the centralizer, that is, to ensure the stability of the centralizer on the inner tube without removing the stop ring. To achieve this objective, the integral elastic centralizer provided in this embodiment includes two spaced steel rings 1 and an elastic centralizer strip 2 disposed between the two steel rings 1. The elastic centralizer strip 2 is evenly distributed in a ring between the two steel rings 1. The above structure is a common structure of existing integral elastic centralizers, and therefore, it will not be described in detail in this embodiment.

[0019] Considering the need to secure the centralizer, locking is required. The simplest locking method is to use bolts or set screws. Therefore, a set screw tube 11 is provided on the side wall of the steel ring 1. A through hole communicating with the set screw tube 11 is provided on the steel ring 1. The set screw tube 11 is internally threaded with a set screw. In actual processing, the set screw tube 11 can be welded to the steel ring 1 first, and then the set screw tube 11 is tapped. This way, the through hole also has threads, which improves the fixing effect. In this embodiment, the set screw tube 11 is welded to the steel ring 1 mainly because the thickness of the steel ring 1 is limited, making it difficult to ensure the stability of the set screw. The set screw tube 11 ensures the stability of the set screw, thereby ensuring the fixing effect. In this embodiment, to further ensure the fixing effect, the set screw tubes 11 are evenly distributed in a ring on the side wall of the steel ring 1. Specifically, six set screw tubes 11 are provided on each steel ring 1. Thus, the centralizer is relatively fixed by locking the set screws.

[0020] To further ensure the fixation of the centralizer relative to the steel ring 1, serrated protrusions 14 are provided on the inner wall of the steel ring 1. In this embodiment, the serrated protrusions 14 are fixed to the inner wall of the steel ring 1 by welding to reduce the stamping difficulty of the steel ring 1. Thus, the serrated protrusions 14 face the direction of the inner tube's movement. Therefore, when the inner tube moves, the serrated protrusions 14 will generate a reaction force, thereby ensuring the stability of the centralizer. In this embodiment, the serrated protrusions 14 are also evenly distributed in a ring on the inner wall of the steel ring 1.

[0021] To further secure the centralizer, a C-shaped groove 12 is provided on the inner wall of the steel ring 1. An extension hole 13, which mates with the groove 12, is provided on the side wall of the steel ring 1. A retaining spring is installed inside the groove 12, with both ends of the retaining spring passing through the extension hole 13. This further secures the steel ring 1 using the retaining spring. Alternatively, the retaining spring can be omitted; during on-site construction, a reinforcing bar can be inserted through the extension hole 13 and then used for binding.

[0022] To ensure a secure hold, grooves 12 are positioned on the upper and lower sides of the serrated protrusions 14, with the two grooves 12 staggered. That is, the protruding holes 13 of the two grooves 12 are positioned opposite each other, thus improving the locking effect of the stabilizer through mutual locking.

[0023] To improve the support effect of the stabilizer, in this embodiment, the elastic stabilizer 2 includes a connecting portion 21 connected to the steel ring 1 and an arc-shaped portion 22 disposed between the connecting portions 21. The lengths of the connecting portions 21 on both sides of the arc-shaped portion 22 are different, and adjacent elastic stabilizer 2 are staggered. In this embodiment, the staggered arrangement of adjacent elastic stabilizer 2 means that the connecting portions 21 at the same end of two adjacent elastic stabilizer 2 are of different sizes. Thus, the protrusions of adjacent elastic stabilizer 2 are staggered, forming two support rings in the entire stabilizer, thereby ensuring the support effect of the stabilizer.

[0024] The above description is merely a preferred embodiment of the present utility model and is not intended to limit the present utility model in any other way. Any person skilled in the art may make changes or modifications to the above-disclosed technical content to create equivalent embodiments for application in other fields. However, any simple modifications, equivalent changes, and modifications made to the above embodiments based on the technical essence of the present utility model without departing from the technical solution of the present utility model shall still fall within the protection scope of the technical solution of the present utility model.

Claims

1. An integral elastic centralizer, comprising two spaced-apart steel rings and an elastic centralizer strip disposed between the two steel rings, wherein the elastic centralizer strip is evenly distributed in a ring between the two steel rings, characterized in that, A set screw tube is provided on the side wall of the steel ring, and a through hole communicating with the set screw tube is provided on the steel ring. A set screw is internally threaded into the set screw tube, and the set screw tube is evenly distributed in a ring on the side wall of the steel ring.

2. The integral elastic centralizer according to claim 1, characterized in that, The inner wall of the steel ring is provided with serrated protrusions, which are evenly distributed in a ring on the inner wall of the steel ring.

3. The integral elastic centralizer according to claim 2, characterized in that, The inner wall of the steel ring is also provided with a groove, which is C-shaped. The side wall of the steel ring is provided with an extension hole that matches the groove. A retaining spring is provided in the groove, and the two ends of the retaining spring protrude through the extension hole.

4. The integral elastic centralizer according to claim 3, characterized in that, The grooves are arranged on the upper and lower sides of the serrated protrusion, and the two grooves are staggered.

5. The integral elastic centralizer according to claim 4, characterized in that, The elastic straightening bar includes a connecting part connected to the steel ring and an arc-shaped part disposed between the connecting parts. The lengths of the connecting parts on both sides of the arc-shaped part are different, and the two adjacent elastic straightening bars are staggered.

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