An oil sands production well casing centralizer

Abstract

The utility model relates to the technical field of centralizer, specifically disclose a kind of oil sand exploitation underground casing centralizer, including centralizer main part, the centralizer main part can be set in casing outside, the outer circumferential surface of the centralizer main part is evenly distributed with several centralizing edges, the circumferential surface of the centralizing edge is equipped with the ball groove of strip, the first end of the ball groove is penetrated the first end surface of the centralizer main part, several balls are matched and installed in the ball groove, the ball is partly protruding from the circumferential surface of the centralizing edge, between adjacent ball in the same ball groove, it is equipped with partition block, the partition block is matched and installed in the ball groove, the first end of the ball groove is matched and installed with abutment, the first end surface of the centralizer main part is detachably installed with fixed cover, the abutment is equipped between the ball and the fixed cover similar to itself, the centralizer provided by the utility model is beneficial to assembly, and good smoothness.

Description

Technical Field

[0001] This utility model relates to the field of centralizer technology, and in particular to a downhole casing centralizer for oil sands mining. Background Technology

[0002] With the development of oil sands extraction technology, the application of extended reach wells and long horizontal wells is becoming increasingly widespread. The casing displacement distance within the well is constantly extending, leading to greater frictional resistance with the wellbore during casing installation. Simultaneously, casing annular eccentricity is becoming more severe. Improving the cementing quality of highly deviated wells, directional wells, and horizontal wells has become a key technical issue in the development of directional well technology. Using a centralizer during casing installation is a very effective solution.

[0003] Existing centralizers can be divided into rigid centralizers and ball centralizers. Rigid centralizers have greater friction with the wellbore and have poor drag reduction effect when running casing. Ball centralizers have balls installed on the surface of the centralizing edge, which replaces the rigid friction of the centralizing edge with the rolling friction of the balls, effectively reducing the resistance of the centralizer.

[0004] Existing ball bearing centralizers either have unreasonable ball bearing installation structures (as shown in patent 201720561118.0, where the balls are arranged side-by-side in ball bearing grooves, making it easy for adjacent balls to get stuck with mud and sand, preventing them from rolling); or their manufacturing methods are too cumbersome (as shown in patent 201920630638.1, where a mounting groove is set for each ball bearing on the centralizing ridge, a ball bearing sleeve is embedded in the mounting groove, and the ball bearing is installed in the ball bearing sleeve). Therefore, it is very necessary to provide a centralizer that is easy to install and can prevent the balls from getting stuck. Utility Model Content

[0005] To address the problems mentioned in the background art, the purpose of this utility model is to provide a downhole casing centralizer for oil sands mining.

[0006] To achieve the above objectives, the technical solution of this utility model is as follows:

[0007] A casing centralizer for oil sands mining includes a centralizer body that can be fitted over the casing. The outer circumferential surface of the centralizer body is evenly distributed with several centralizing ridges. A strip-shaped ball groove is formed on the circumferential surface of each centralizing ridge. The first end of each ball groove penetrates the first end face of the centralizer body. Several balls are fitted within the ball groove, with portions of each ball protruding from the circumferential surface of the centralizing ridge. A separating block is provided between adjacent balls within the same ball groove, and the separating block is fitted within the ball groove. A stop block is fitted within the first end of each ball groove. A fixing cap is detachably installed on the first end face of the centralizer body, and the stop block abuts against the adjacent ball and the fixing cap.

[0008] Furthermore, the second end of the ball groove, the end of the separator block that contacts the ball, and the end of the abutment block that contacts the ball are all shaped like a ball socket, and the size of the ball socket matches the ball.

[0009] Furthermore, the shape of the fixing cover matches the shape of the first end face of the centralizer body.

[0010] Furthermore, the fixing cover is fixed to the first end face of the centralizer body by several bolts.

[0011] The beneficial effects of this utility model are as follows: a fixed cover can lock several balls, partition blocks and abutment blocks, which is very convenient to disassemble and assemble, and effectively reduces the assembly difficulty; adjacent balls are separated by partition blocks, so the balls are not easily jammed by mud and sand, ensuring the smoothness of the stabilizer. Attached Figure Description

[0012] Figure 1 This is a perspective view of an embodiment of the present utility model;

[0013] Figure 2 This is an exploded view of an embodiment of the present utility model.

[0014] Explanation of the attached figures: 1. Main body of the straightener, 11. Straightening ridge, 12. Ball groove, 2. Ball, 3. Divider block, 4. Abutment block, 5. Fixing cover, 6. Bolt. Detailed Implementation

[0015] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. All other embodiments obtained by those skilled in the art based on the embodiments of the present utility model are within the protection scope of the present utility model.

[0016] like Figures 1-2As shown, a casing centralizer for oil sands well drilling includes a centralizer body 1, which is cylindrical and can be fitted onto the casing. Six centralizing ridges 11 are circumferentially distributed on the outer circumferential surface of the centralizer body 1, extending along the axial direction of the centralizer body 1. A strip-shaped ball groove 12 parallel to the axial direction of the centralizer body 1 is formed on the circumferential surface of the centralizing ridge 11. The first end of the ball groove 12 penetrates the first end face of the centralizer body 1. Four balls 2 are fitted into the ball groove 12, with the balls 2 partially protruding from the circumferential surface of the centralizing ridge 11. Adjacent balls 2 within the same ball groove 12... A partition block 3 is provided between the ball groove 12 and the ball groove 12. A stop block 4 is installed in the first end of the ball groove 12. Specifically, the cross section of the ball groove 12 along the axial direction of the centralizer body 1 is arc-shaped, and the arc shape corresponds to the apex of the arc. A limiting groove is opened at the apex of the arc of the ball groove 12. The limiting groove extends along the axial direction of the centralizer body 1. The apex of the ball groove 4 and the partition block 3 are respectively provided with limiting protrusions that match the shape of the groove. A fixing cover 5 is fixed on the first end face of the centralizer body 1 by six bolts 6. The stop block 4 is abutted between the ball 2 close to itself and the fixing cover 5.

[0017] When assembling this stabilizer, first install the balls 2 and the separator blocks 3 in a staggered manner in the ball groove 12, then install the abutment block 4 in the ball groove 12, and finally lock the fixing cover 5 on the first end face of the stabilizer body 1. Several balls 2, separator blocks 3 and abutment blocks 4 can be locked with one fixing cover 5, which is very convenient for disassembly and assembly and effectively reduces the assembly difficulty. Adjacent balls 2 are separated by the separator blocks 3, so the balls 2 are not easily jammed by mud and sand, ensuring the smoothness of the stabilizer.

[0018] In this embodiment, the second end of the ball groove 12, the end of the separator block 3 that contacts the ball 2, and the end of the abutment block 4 that contacts the ball 2 are all spherical. The size of the spherical cavity matches the ball 2, which is a reasonable design and reduces the gap between the separator block 3 and the abutment block 4 and the ball 2.

[0019] In this embodiment, the shape of the fixed cover 5 matches the shape of the first end face of the centralizer body 1, which is a reasonable design and facilitates the removal of mud.

[0020] The above description is only a preferred embodiment of the present utility model and is not intended to limit the present utility model. Any modifications, equivalent substitutions, improvements, etc., within the spirit and principles of the present utility model should be included within the protection scope of the present utility model.

Claims

1. A casing centralizer for oil sands mining, comprising a centralizer body (1), wherein the centralizer body (1) can be fitted over the casing, and a plurality of centralizing ridges (11) are evenly distributed on the outer circumferential surface of the centralizer body (1), characterized in that, The circumferential surface of the straightening ridge (11) is provided with a strip-shaped ball groove (12). The first end of the ball groove (12) penetrates the first end face of the straightener body (1). A plurality of balls (2) are installed in the ball groove (12). The balls (2) protrude from the circumferential surface of the straightening ridge (11). A partition block (3) is provided between adjacent balls (2) in the same ball groove (12). The partition block (3) is installed in the ball groove (12). A stop block (4) is installed in the first end of the ball groove (12). A fixing cover (5) is detachably installed on the first end face of the straightener body (1). The stop block (4) is positioned between the ball (2) close to itself and the fixing cover (5).

2. The oil sands well casing centralizer according to claim 1, characterized in that, The second end of the ball groove (12), the end of the separator (3) that contacts the ball (2), and the end of the abutment (4) that contacts the ball (2) are all ball-shaped, and the size of the ball matches the ball (2).

3. A downhole casing centralizer for oil sands mining according to claim 1, characterized in that, The shape of the fixing cover (5) matches the shape of the first end face of the straightener body (1).

4. A downhole casing centralizer for oil sands mining according to claim 1, characterized in that, The fixing cover (5) is fixed to the first end face of the body (1) of the straightener by a number of bolts (6).

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