Rigid centralizer convenient for improving fluid flow

Abstract

The utility model belongs to the field of petroleum equipment, and particularly relates to a rigid centralizer convenient for improving fluid flow. Comprising a sleeve and spiral ribs arranged on the sleeve in a sleeving mode, guide sleeves are arranged at the two ends of the sleeve, the two ends of the sleeve are sleeved with the guide sleeves, the outer walls of the guide sleeves are arranged in a cambered surface mode, guide grooves are further formed in the outer walls of the guide sleeves, the guide grooves are obliquely formed in the outer walls of the guide sleeves, and the spiral ribs are arranged in the guide grooves. A groove opening of the guide groove is attached to the side wall of the spiral rib, and the inclination direction of the guide groove is the extension direction of the spiral rib in the spiral direction. According to the centralizer, the guide sleeve is arranged, so that the flow guide effect of the whole centralizer is improved, the guide groove is arranged, the flow speed of most of slurry is increased, and the cement slurry or drilling fluid generates turbulent flow, so that the uniformity of a cement sheath is improved, and the purpose of improving the well cementation effect is achieved.

Description

TECHNICAL FIELD

[0001] The utility model belongs to petroleum equipment field, especially relate to a rigid centralizer convenient for improving fluid flow. BACKGROUND

[0002] The centralizer belongs to a cementing tool, and is a fixing device capable of guaranteeing drilling cementing quality. In the prior art, the centralizer can be divided into an elastic centralizer and a rigid centralizer according to the style, wherein the rigid centralizer has irreplaceability in reducing frictional resistance and improving casing centralization degree through high-strength material and targeted design, and is especially suitable for large displacement wells, horizontal wells and high requirement cementing operations.

[0003] At present, the existing rigid centralizer mainly comprises a casing and a rib strip sleeved on the casing, the rib strip comprises a radial convex rib and a spiral rib strip, and the spiral rib strip is designed to guide the cement slurry or drilling fluid to form a spiral flow, thereby enhancing the displacement efficiency of annular fluid and improving the fixing effect. Therefore, how to improve the fluid effect is the improvement direction of the rigid centralizer. UTILITY MODEL CONTENT

[0004] In view of the technical problem of fluid effect improvement of the existing rigid centralizer, the utility model provides a rigid centralizer convenient for improving fluid flow, which is reasonable in design, simple in structure, convenient to process and capable of effectively improving the fluid effect.

[0005] In order to achieve the above purpose, the utility model adopts the technical scheme that the utility model provides a rigid centralizer convenient for improving fluid flow, which comprises a casing and a spiral rib strip sleeved on the casing, both ends of the casing are provided with guide sleeves, the guide sleeves are sleeved on both ends of the casing, the outer wall of the guide sleeve is arc-shaped, a guide groove is further arranged on the outer wall of the guide sleeve, the guide groove is arranged on the outer wall of the guide sleeve in an inclined manner, the groove of the guide groove is arranged in abutment with the side wall of the spiral rib strip, and the inclined direction of the guide groove is the extension of the spiral direction of the spiral rib strip.

[0006] Preferably, the depth of the guide groove gradually increases from the end of the casing to the spiral rib strip.

[0007] Preferably, the thickness of the guide sleeve is less than the thickness of the spiral rib strip.

[0008] Preferably, the thickness of the guide sleeve is between one half and two thirds of the thickness of the spiral rib strip.

[0009] Preferably, a plurality of balls are arranged on the outer wall of the spiral rib strip.

[0010] Preferably, the balls are arranged on the outer wall of the spiral rib strip in an interval.

[0011] Compared with the prior art, the advantages and positive effects of this utility model are as follows:

[0012] 1. This embodiment provides a rigid centralizer that facilitates improved fluid flow. By setting the guide sleeve, the flow guiding effect of the entire centralizer is improved. Furthermore, by setting the guide groove, the flow rate of part of the mud is increased, causing turbulence in the cement slurry or drilling fluid, thereby improving the uniformity of the cement sheath and thus achieving the purpose of improving the cementing effect. Attached Figure Description

[0013] 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.

[0014] Figure 1 This is a schematic diagram of the rigid centralizer provided in Example 1 for improving fluid flow.

[0015] Figure 2 A front view of the rigid centralizer provided in Example 1 for improving fluid flow;

[0016] Figure 3 for Figure 2 A sectional view.

[0017] In the above figures, 1 is the sleeve; 2 is the spiral rib; 3 is the guide sleeve; 31 is the outer wall of the guide sleeve; 32 is the guide groove; and 4 is the ball bearing. Detailed Implementation

[0018] 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.

[0019] 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.

[0020] Example 1, such as Figures 1-3As shown, the rigid centralizer for improving fluid flow provided by the embodiment is provided to improve the effect of cementing, and comprises a sleeve 1 and a spiral rib 2 sleeved on the sleeve 1. The above structure is a common structure, and thus is not described in detail in the embodiment.

[0021] The spiral rib 2 is mainly used to guide the cement slurry or drilling fluid to form a spiral flow, and thus, in order to increase the effect, a guide sleeve 3 is arranged at both ends of the sleeve 1 in the embodiment. The guide sleeve 3 can be integrally formed with the sleeve 1 or fixed by being sleeved later. In order to guide the flow, the outer wall 31 of the guide sleeve 3 is arc-shaped. In order to increase the size of the flow cut into the spiral rib 2, a guide groove 32 is further arranged on the outer wall of the guide sleeve 3. The guide groove 32 is arranged on the outer wall of the guide sleeve 3 in an inclined manner, and the groove of the guide groove 32 is arranged in abutment with the side wall of the spiral rib 2. The inclined direction of the guide groove 32 is the extension of the spiral direction of the spiral rib 2. The guide groove 32 is also a spiral groove, and if the spiral rib 2 is regarded as a spiral object, the guide groove 32 is a hole with the same spiral angle and size as the spiral rib 2. The groove of the guide groove 32 is arranged in abutment with the side wall of the spiral rib 2, which means that the right side wall of the guide groove 32 abuts against the left side wall of the spiral rib 2. In this way, the cement slurry or drilling fluid entering the spiral rib 2 through the guide groove 32 is directly cut into the guide of the spiral rib 2. In this way, the guide groove 32 is used to increase the speed, the spiral rib 2 is used to increase the spiral flow, and the effect of improving the fluid flow is achieved.

[0022] In order to further improve the spiral effect, the depth of the guide groove 32 gradually increases from the end of the sleeve 1 to the spiral rib 2.

[0023] In order to avoid the pushing of the slurry, the thickness of the guide sleeve 3 is less than the thickness of the spiral rib 2 in the embodiment. The thickness of the guide sleeve 3 is between one half and two thirds of the thickness of the spiral rib 2. In this way, a part of the slurry will enter the middle of the sleeve under the guidance of the guide sleeve 3. Since the flow of the cement slurry or drilling fluid is relatively straight, a certain turbulent flow is generated between the spiral cement slurry or drilling fluid, so as to improve the uniformity of the cement sheath, and the effect of improving the cementing is achieved.

[0024] In order to reduce the friction, in the embodiment, the ball is arranged on the outer wall of the spiral rib 2, and the ball is rotatably arranged on the outer wall of the spiral rib 2. The balls are arranged on the outer wall of the spiral rib 2 at intervals. In this way, the traditional sliding walking is changed into rolling walking, so that the friction is reduced, and the service life of the centralizer is improved.

[0025] The above is only the preferred embodiment of the present application, and is not intended to limit the present application in other forms. Any skilled person in the art can modify or change the above disclosed technology content to equivalent embodiments applied to other fields, but any simple modification, equivalent change and modification made to the above embodiments without departing from the technical scheme of the present application, according to the technical essence of the present application, still belongs to the protection scope of the technical scheme of the present application.

Claims

1. A rigid centralizer for facilitating improved fluid flow, comprising a sleeve and helical ribs encased on the sleeve, characterized in that, The sleeve is provided with a guide sleeve at both ends, the guide sleeve is sleeved on both ends of the sleeve, the outer wall of the guide sleeve is arc-shaped, the outer wall of the guide sleeve is further provided with a guide groove, the guide groove is inclined on the outer wall of the guide sleeve, the slot of the guide groove is arranged in close contact with the side wall of the spiral rib, and the inclined direction of the guide groove is the extension of the spiral direction of the spiral rib.

2. The rigid centralizer to facilitate improved fluid flow of claim 1, wherein, The depth of the guide groove gradually deepens from the end of the sleeve to the direction of the spiral rib.

3. The rigid centralizer to facilitate improved fluid flow of claim 2, wherein, The thickness of the guide sleeve is less than the thickness of the spiral rib.

4. The rigid centralizer to facilitate improved fluid flow of claim 3, wherein, The thickness of the guide sleeve is between one half and two thirds of the thickness of the spiral rib.

5. The rigid centralizer of any one of claims 1-4, wherein, The outer wall of the spiral rib is provided with a ball, and the ball is rotationally arranged on the outer wall of the spiral rib.

6. The rigid centralizer to facilitate improved fluid flow of claim 5, wherein, The balls are arranged at intervals on the outer wall of the spiral rib.

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