Oilfield underground centralizer

Abstract

The utility model discloses an oil field underground centralizer, which relates to the technical field of underground centralization, and comprises two arc-shaped frames, the two arc-shaped frames are connected through two fixing mechanisms, the outer walls of the two arc-shaped frames are connected with a plurality of rolling mechanisms, the upper ends of the two arc-shaped frames are fixedly connected with arc-shaped blocks, and the upper ends of the arc-shaped blocks are fixedly connected with the rolling mechanisms. The device comprises two arc-shaped blocks, centralizing frames are arranged on the sides, close to each other, of the two arc-shaped blocks, inserting grooves are formed in the upper ends of the two centralizing frames, centralizing blocks are fixedly inserted into the two inserting grooves through two second bolts, and driving mechanisms for driving the two centralizing frames to move are arranged on the two arc-shaped blocks. By simplifying the connection operation and flexibly adapting to sleeves of different specifications, the underground operation efficiency and economical efficiency are remarkably improved.

Description

Technical Field

[0001] This utility model relates to the field of downhole centralization technology, and in particular to an oilfield downhole centralization device. Background Technology

[0002] During oilfield development, the downhole environment of oil wells is complex and variable. As the extraction depth increases, wellbore trajectory control becomes particularly crucial. The downhole casing needs to be accurately lowered to the predetermined position and maintained in good centering to ensure the smooth progress of subsequent extraction operations. Centralizers play a key role in this process.

[0003] A Chinese patent with publication number CN219795176U, entitled "A Rotary Cementing Roller Centralizer," includes a centralizer, a first fixed plate, and a second fixed plate. Clamping mechanisms are fixedly connected to the top and bottom of the centralizer. In use, depending on the diameter of the well being cemented, a threaded rod is first passed through the limiting hole of the first fixed plate and fixedly connected to the first clamping sleeve. Then, the threaded rod is rotated, causing both the first and second clamping sleeves to move towards the center, thus clamping the casing. A nut is then fitted onto the outer surface of the threaded rod and tightened, thereby fixing the centralizer onto the casing. However, connecting the two centralizers is cumbersome, requiring the tightening of multiple screws at the top and bottom positions. Furthermore, the fixed shapes of the first and second clamping sleeves limit their applicability to casings of the same size. Utility Model Content

[0004] The purpose of this utility model is to address the shortcomings of existing technologies by proposing a downhole centralizer for oilfields.

[0005] To achieve the above objectives, the present invention adopts the following technical solution:

[0006] A downhole centralizer for oilfields includes two arc-shaped frames connected by two fixing mechanisms. Multiple rolling mechanisms are connected to the outer walls of each arc-shaped frame. Arc-shaped blocks are fixedly connected to the upper ends of each arc-shaped frame. A centralizing frame is provided on the side of each arc-shaped block that is close to the other. Insertion slots are provided at the upper ends of each centralizing frame. Centralizing blocks are fixedly inserted into each insertion slot by two second bolts. A driving mechanism for moving the two centralizing frames is provided on each arc-shaped block.

[0007] As a further improvement of this utility model, the fixing mechanism includes a connecting block fixedly connected to one end of an arc-shaped frame, and a connecting groove is provided on one end of another arc-shaped frame. The connecting block is inserted into the connecting groove. An extension screw is provided above the arc-shaped frame, and the lower end of the extension screw passes through the connecting groove and the connecting block and is threaded with a nut.

[0008] As a further improvement of this utility model, the rolling mechanism includes a mounting block fixedly connected to the outer wall of the arc-shaped frame, a mounting frame sleeved on the mounting block, the mounting frame being fixedly connected to the mounting block by a plurality of first bolts, and a plurality of ball bearings being embedded on one side of the mounting frame.

[0009] As a further improvement of this utility model, the driving mechanism includes a bearing seat fixedly connected to one side of the straightening frame, and a threaded rod is threadedly connected to one side of the arc-shaped block. One end of the threaded rod is rotatably connected to the straightening frame through the bearing seat.

[0010] As a further improvement of this utility model, guide blocks are provided on both sides of the threaded rod, and one end of each guide block passes through the arc-shaped block and is fixedly connected to one side of the straightening frame.

[0011] As a further improvement of this utility model, threaded grooves are provided on both ends of the two straightening blocks, and each second bolt passes through the corresponding insertion groove and is threaded into the threaded groove.

[0012] The beneficial effects of this utility model are:

[0013] This device connects two arc-shaped frames by inserting a connecting block into a connecting slot and then using an extended screw to pass through and secure it with a nut. Compared to the traditional method that requires tightening multiple screws from both the top and bottom, this connection method greatly simplifies the operation process. During downhole operations, the simple connection operation can effectively reduce installation time, improve work efficiency, and reduce the risk of human error that may arise from cumbersome operations, thereby improving the safety and reliability of the entire downhole operation.

[0014] The centralizing block of this oilfield downhole centralizer engages with a second bolt via a slot, enabling flexible clamping of casing of different specifications. Compared to clamping sleeves with fixed shapes that can only clamp casing of the same specification, this structure offers greater applicability. During oilfield development, the need for different casing specifications may arise, and this centralizer can easily handle these demands, eliminating the need for frequent equipment changes, reducing equipment costs and preparation time, and improving the economy and convenience of oilfield operations.

[0015] This invention significantly improves the efficiency and economy of downhole operations by simplifying connection operations and flexibly adapting to different specifications of casing. Attached Figure Description

[0016] Figure 1 This is a schematic diagram of the structure of an oilfield downhole centralizer proposed in this utility model;

[0017] Figure 2 This is a partial cross-sectional structural diagram of the arc-shaped block, drive mechanism, centralizing frame, plug groove, threaded groove, second bolt, centralizing block, and guide block connection of an oilfield downhole centralizer proposed in this utility model.

[0018] Figure 3 This is a schematic diagram of a partial cross-section of an oilfield downhole centralizer proposed in this utility model, viewed from the top.

[0019] In the diagram: 1. Arc frame, 2. Mounting frame, 3. Mounting block, 4. Ball bearing, 5. First bolt, 6. Extending screw, 7. Arc block, 8. Straightening frame, 9. Insert groove, 10. Straightening block, 11. Second bolt, 12. Guide block, 13. Threaded rod, 14. Connecting groove, 15. Connecting block, 16. Nut, 17. Bearing seat, 18. Threaded groove. Detailed Implementation

[0020] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments of the present utility model. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments.

[0021] Figures 1-3 An oilfield downhole centralizer includes two arc-shaped frames 1, which form the main frame of the centralizer and provide basic structural support for the entire device. The two arc-shaped frames 1 are connected by two fixing mechanisms. The fixing mechanism includes a connecting block 15 fixedly connected to one end of one arc-shaped frame 1, and a connecting groove 14 opened on one end of the other arc-shaped frame 1. The connecting groove 14 is used to accommodate the connecting block 15, realizing the initial docking of the two arc-shaped frames 1. The connecting block 15 is inserted into the connecting groove 14. An extension screw 6 is provided above the arc-shaped frame 1. The length of the extension screw 6 is sufficient to pass through the connecting groove 14 and the connecting block 15 to achieve a stable connection. The lower end of the extension screw 6 passes through the connecting groove 14 and the connecting block 15 and is threadedly connected to a nut 16. The nut 16 cooperates with the extension screw 6, and the connecting block 15 is tightly fixed in the connecting groove 14 through the threaded connection to ensure the firmness of the connection between the two arc-shaped frames 1.

[0022] Multiple rolling mechanisms are connected to the outer walls of both arc-shaped frames 1. Each rolling mechanism includes a mounting block 3 fixedly connected to the outer wall of the arc-shaped frame 1. The mounting block 3 provides a base support point for the installation of subsequent components. A mounting frame 2 is fitted onto the mounting block 3. The mounting frame 2 is fixedly connected to the mounting block 3 by multiple first bolts 5. The first bolts 5 serve to fix the mounting frame 2 and the mounting block 3, ensuring the mounting frame 2 is stably installed on the mounting block 3. Multiple ball bearings 4 are embedded on one side of the mounting frame 2, allowing them to roll and reduce friction. Arc-shaped blocks 7 are fixedly connected to the upper ends of both arc-shaped frames 1. A straightening frame 8 is provided on the side of the two arc-shaped blocks 7 that is close to each other. An insertion groove 9 is provided at the upper end of each of the two straightening frames 8. A straightening block 10 is fixedly inserted into each of the two insertion grooves 9 by two second bolts 11. After the straightening block 10 is inserted into the insertion groove 9 and fixed, it can effectively clamp the sleeve. Threaded grooves 18 are provided at both ends of each of the two straightening blocks 10, and each second bolt 11 passes through the threaded groove. The corresponding insertion slot 9 is threaded into the threaded groove 18. The second bolt 11 is threaded into the threaded groove 18 to firmly fix the straightening block 10 into the insertion slot 9. Both arc-shaped blocks 7 are provided with a drive mechanism to drive the two straightening frames 8 to move. The drive mechanism includes a bearing seat 17 fixedly connected to one side of the straightening frame 8. A threaded rod 13 is threadedly connected to one side of the arc-shaped block 7. The threaded rod 13 can generate axial displacement when rotating through the threaded connection with the arc-shaped block 7, thereby driving the straightening frame 8 to move. One end of the threaded rod 13 is rotatably connected to the straightening frame 8 through the bearing seat 17. The bearing seat 17 provides support for the rotatable connection between the threaded rod 13 and the straightening frame 8, ensuring that the threaded rod 13 can rotate smoothly and drive the straightening frame 8 to move. Guide blocks 12 are provided on both sides of the threaded rod 13. One end of each guide block 12 passes through the arc-shaped block 7 and is fixedly connected to one side of the straightening frame 8. The guide blocks 12 guide the movement of the straightening frame 8 and restrict it to move only in a specific direction.

[0023] In use, this utility model involves fixing multiple mounting frames 2 to mounting blocks 3 using first bolts 5, then connecting two arc-shaped frames 1 using two fixing mechanisms, inserting two connecting blocks 15 into two connecting slots 14, and then inserting two extension screws 6 from the upper end to the lower end of the two arc-shaped frames 1, simultaneously penetrating the two connecting blocks 15 and the two connecting slots 14, thus fixing the two connecting blocks 15 within the two connecting slots 14. Nuts 16 are then screwed onto the threaded ends of the two extension screws 6 for fixation. After the two arc-shaped frames 1 are connected, multiple straightening blocks 10 adapted for the sleeve are inserted into the corresponding insertion slots 9 and fixed using two second bolts 11. The adapted sleeve is then inserted between the two arc-shaped frames 1. By rotating multiple threaded rods 13, the rotation of the multiple threaded rods 13, in their threaded connection with the arc-shaped blocks 7, causes their respective straightening frames 8 to move, thereby clamping the sleeve with the multiple straightening blocks 10.

[0024] The above description is only a preferred embodiment of the present utility model, but the protection scope of the present utility model is not limited thereto. Any equivalent substitutions or changes made by those skilled in the art within the technical scope disclosed in the present utility model, based on the technical solution and the inventive concept of the present utility model, should be included within the protection scope of the present utility model.

Claims

1. A downhole centralizer for oil wells, comprising two arc-shaped frames (1), characterized in that, Two arc-shaped frames (1) are connected by two fixing mechanisms, the outer walls of the two arc-shaped frames (1) are connected with a plurality of rolling mechanisms, the upper ends of the two arc-shaped frames (1) are fixedly connected with arc-shaped blocks (7), the sides of the two arc-shaped blocks (7) close to each other are provided with righting frames (8), the upper ends of the two righting frames (8) are provided with plug-in grooves (9), the two plug-in grooves (9) are fixedly plugged with righting blocks (10) through two second bolts (11), and the two arc-shaped blocks (7) are provided with driving mechanisms for driving the two righting frames (8) to move.

2. A downhole centralizer for use in an oilfield as defined in claim 1, wherein, The fixing mechanism comprises a connecting block (15) fixedly connected to one end of one arc-shaped frame (1), a connecting groove (14) is formed in one end of the other arc-shaped frame (1), the connecting block (15) is plugged into the connecting groove (14), an extension screw (6) is arranged above the arc-shaped frame (1), and the lower end of the extension screw (6) penetrates through the connecting groove (14), the connecting block (15) and is threadedly connected with a nut (16).

3. A downhole centralizer for use in an oilfield as defined in claim 1, wherein, The rolling mechanism comprises a mounting block (3) fixedly connected to the outer wall of the arc-shaped frame (1), a mounting frame (2) is sleeved on the mounting block (3), the mounting frame (2) is fixedly connected with the mounting block (3) through a plurality of first bolts (5), and a plurality of rolling balls (4) are embedded on one side of the mounting frame (2).

4. An oilfield downhole centralizer according to claim 1, wherein, The driving mechanism comprises a bearing seat (17) fixedly connected to one side of the righting frame (8), one side of the arc-shaped block (7) is threadedly connected with a threaded rod (13), and one end of the threaded rod (13) is rotatably connected with the righting frame (8) through the bearing seat (17).

5. An oilfield downhole centralizer according to claim 4, wherein, The threaded rod (13) is provided with a guide block (12) on both sides, and one end of the two guide blocks (12) penetrates through the arc-shaped block (7) and is fixedly connected to one side of the righting frame (8).

6. An oilfield downhole centralizer according to claim 1, wherein, Threaded grooves (18) are formed in the two ends of the two righting blocks (10), and each second bolt (11) penetrates through the corresponding plug-in groove (9) and is threadedly connected in the threaded groove (18).

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