Downhole casing centralizer

Abstract

The utility model belongs to the technical field of casing centralizers, and particularly relates to an underground casing centralizer which comprises a centralizer body, the centralizer body is composed of an upper positioning ring and a lower positioning ring, and the upper positioning ring and the lower positioning ring are connected through a plurality of first screws and second screws which are arranged in a staggered mode. An inner gear is rotationally connected to the edge of the lower positioning ring, a driving gear meshed with the inner gear is connected to the bottom of each first screw rod, and a driving mechanism is arranged at the position, located on the upper positioning ring, of one first screw rod; the two ends of the first screw rod are connected with a first moving frame through threads, and the first moving frame is located on the inner side of the centralizer body and rotationally connected with a guide wheel through a first connecting plate; second moving frames are connected to the two ends of the second screw rod through threads, the portions, located on the outer side of the centralizer body, of the second moving frames are rotationally connected with guide frames through second connecting plates, and positioning plates are arranged on the outer sides of the guide frames.

Description

Technical Field

[0001] The utility model belongs to the technical field of casing centralizers, and in particular relates to a casing centralizer used downhole. Background Art

[0002] Casing centralizers are tools used in oil drilling operations. They are typically made of high-strength materials such as steel and come in various shapes, such as rings or spirals. During the drilling process, when casing is lowered into the well, it can easily deviate from the wellbore center due to irregularities in the wellbore wall and formation tilt. Casing centralizers help center the casing in the wellbore, ensuring a uniform annular space between the casing and the wellbore wall, creating optimal conditions for subsequent cementing operations.

[0003] During use, most existing downhole casing centralizers use a separate positioning method to center the casing to determine the middle position, which is not only time-consuming but also may cause the casing to deviate. In addition, the exterior of most existing downhole casing centralizers is fixed by anchor rods or the like, which makes it inconvenient to recover them after use, which is relatively wasteful. Utility Model Content

[0004] The technical problem to be solved by the present invention is that most of the existing downhole casing centralizers adopt a separate positioning method to center the casing, which is not only time-consuming but also may cause the casing to deviate. In addition, most of the external parts are fixed by anchor rods or the like, which makes it inconvenient to recover them after use, which is relatively wasteful.

[0005] The cam is connected to the lower frame by a plurality of first and second screws, and the cam is connected to the lower frame by a plurality of second screws. The cam is connected to the upper frame by a plurality of second screws. The cam is connected to the lower frame by a plurality of first and second screws. The cam is connected to the upper frame by a plurality of second screws.

[0006] Furthermore, the number of the first screw and the second screw is 4, and the first screw and the second screw are arranged at equal angles between the upper positioning ring and the lower positioning ring.

[0007] Furthermore, the thread directions of the two ends of the first screw and the second screw are opposite.

[0008] Furthermore, the driving mechanism includes a worm wheel and a worm that mesh with each other, the worm wheel is fixedly connected to the top of the single first screw, and one end of the worm is connected to a motor.

[0009] Furthermore, the first connecting plates are rotatably connected to both sides of the first movable frame, and the connections between the upper and lower first connecting plates and the guide wheels are staggered.

[0010] Furthermore, the rotation axis of the guide wheel is perpendicular to the connected first screw, and the guide wheel is located in the middle of the centralizer body.

[0011] Furthermore, the second connecting plate is rotatably connected to both sides of the second movable frame, and the second connecting plate is rotatably connected to both sides of the guide frame, the middle position of the guide frame and the positioning plate are both located in the middle of the stabilizer body, and the positioning plate is arranged parallel to the axial direction of the stabilizer body.

[0012] The advantages of this utility model compared with the prior art are:

[0013] 1. The internal driving mechanism of the casing centralizer drives the first screw to rotate, which in turn drives the connected driving gear and the meshing internal gear, so that the internal gear drives the other driving gears to rotate synchronously, causing multiple first screws to rotate synchronously, allowing the connected first moving frame to move toward the center, causing the guide wheel to protrude inward, and positioning and straightening the casing in the middle from multiple directions;

[0014] 2. The second screw is driven by tightening the outside of the casing centralizer separately, and then the second movable frame connected thereto is moved toward the middle by the second screw, so that the guide frame and the positioning plate are moved outward, and then contact and fix with the inner wall of the well. It is convenient and quick, and can be recovered after use for easy reuse. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 This utility model is a structure of a casing centralizer for underground use Figure 1 .

[0016] Figure 2 This utility model is a structure of a casing centralizer for underground use Figure 2 .

[0017] Figure 3This is a diagram of the first screw connection structure of a downhole casing centralizer of the utility model.

[0018] Figure 4 This is a diagram of the second screw connection structure of a downhole casing centralizer of the utility model.

[0019] As shown in the figure:

[0020] 1. Centralizer body; 2. Upper locating ring; 3. Lower locating ring; 4. First screw; 5. Second screw; 6. Internal gear; 7. Drive gear; 8. Hexagonal nut; 9. First movable frame; 10. First connecting plate; 11. Guide wheel; 12. Second movable frame; 13. Second connecting plate; 14. Guide frame; 15. Positioning plate; 16. Worm gear; 17. Worm; 18. Motor. DETAILED DESCRIPTION

[0021] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the embodiments described are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of the present invention.

[0022] In the description of the utility model, it should be noted that, unless otherwise expressly specified or limited, the terms "installed," "provided with," "connected," etc. should be understood in a broad sense. For example, "connected" can mean a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, or it can be internal communication between two components. Those skilled in the art will understand the specific meanings of the above terms in this utility model based on the specific circumstances.

[0023] Example 1:

[0024] As the instruction manual Figure 1-2As shown, a downhole casing centralizer includes a centralizer body 1, which is composed of an upper positioning ring 2 and a lower positioning ring 3. The upper positioning ring 2 and the lower positioning ring 3 are connected by a plurality of staggered first screws 4 and second screws 5. The plurality of first screws 4 and the plurality of second screws 5 are individually rotatably connected to the upper positioning ring 2 and the lower positioning ring 3. The number of the first screws 4 and the second screws 5 are both four, and the first screws 4 and the second screws 5 are arranged at equal angles between the upper positioning ring 2 and the lower positioning ring 3. The thread directions of the two ends of the first screw 4 and the second screw 5 are opposite. The edge of the lower positioning ring 3 is rotatably connected to the internal gear 6. The bottom of the first screw 4 is connected to the driving gear 7 meshing with the internal gear 6. A first screw 4 is located at the upper positioning ring 2 and is provided with a driving mechanism. The driving mechanism includes a worm gear 16 and a worm 17 that mesh with each other. The worm gear 16 is fixedly connected to the top of the single first screw 4. One end of the worm 17 is connected to the motor 18. The second screw 5 is located above the upper positioning ring 2 and is provided with a hexagonal nut 8.

[0025] As the instruction manual Figure 3 As shown, both ends of the first screw 4 are connected to the first movable frame 9 through a threaded connection. The first movable frame 9 is located on the inner side of the stabilizer body 1 and is rotatably connected to the guide wheel 11 through the first connecting plate 10. The first connecting plate 10 is rotatably connected to both sides of the first movable frame 9, and the connections between the upper and lower first connecting plates 10 and the guide wheel 11 are staggered. The rotating axis of the guide wheel 11 is perpendicular to the connected first screw 4, and the guide wheel 11 is located in the middle position of the stabilizer body 1.

[0026] As the instruction manual Figure 4 As shown, both ends of the second screw 5 are connected to the second movable frame 12 through a threaded connection. The second movable frame 12 is located on the outside of the stabilizer body 1 and is rotatably connected to the guide frame 14 through a second connecting plate 13. A positioning plate 15 is provided on the outside of the guide frame 14. The second connecting plate 13 is rotatably connected to both sides of the second movable frame 12, and the second connecting plate 13 is rotatably connected to both sides of the guide frame 14. The middle position of the guide frame 14 and the positioning plate 15 is located in the middle of the centralizer body 1, and the positioning plate 15 is arranged parallel to the axial direction of the centralizer body 1. At the same time, some anchor nails can be set on the outside of the positioning plate 15 for auxiliary fixation to increase the performance of the positioning plate 15.

[0027] When the utility model is implemented, the hexagonal nut 8 on the upper positioning plate 15 is screwed by tightening it separately, driving the second screw rod 5 to rotate, and then the second screw rod 5 drives the connected second movable frame 12 to move toward the middle through the threads in opposite directions at both ends, so that the second connecting plate 13 rotates and the connected guide frame 14 and the positioning plate 15 move outward in parallel, and then contact and fix with the inner wall of the well. At the same time, some anchor nails can be set on the outside of the positioning plate 15 for auxiliary fixation, thereby increasing the performance of the positioning plate 15, being convenient and quick, and being able to be recycled after use for easy reuse;

[0028] The worm 17 is driven to rotate by the motor 18 in the drive mechanism, and then the worm 17 drives the meshing worm wheel 16 to drive the first screw 4 to rotate, and then drives the connected drive gear 7 and the meshing internal gear 6, so that the internal gear 6 drives the other drive gears 7 to rotate synchronously, and multiple first screws 4 are rotated synchronously, so that the connected first movable frame 9 moves toward the middle, and the guide wheel 11 connected by the first connecting plate 10 rotates inward, so that the middle sleeve is positioned and straightened from multiple directions.

[0029] The above description of the present invention and its embodiments is non-limiting. The specific embodiments shown in the specific embodiments are only one embodiment of the present invention, and the actual structure is not limited thereto. In short, if a person skilled in the art is inspired by the above, and does not deviate from the purpose of the present invention, without creatively designing a structure and embodiment similar to the technical solution, they shall fall within the scope of protection of the present invention.

Claims

1. A downhole casing centralizer, comprising a centralizer body, characterized in that: The centralizer body is composed of an upper positioning ring and a lower positioning ring, and the upper positioning ring and the lower positioning ring are connected by a plurality of staggered first screws and second screws, the plurality of first screws and the plurality of second screws are individually rotatably connected to the upper positioning ring and the lower positioning ring, an internal gear is rotatably connected at the edge of the lower positioning ring, the bottom of the first screw is connected to a driving gear meshing with the internal gear, a driving mechanism is provided on the upper positioning ring for the first screw, and a hexagonal nut is provided on the upper part of the second screw; Both ends of the first screw are connected to a first movable frame through threads. The first movable frame is located inside the centralizer body and is rotatably connected to a guide wheel through a first connecting plate. Both ends of the second screw are connected to a second movable frame through threads. The second movable frame is located outside the centralizer body and is rotatably connected to a guide frame through a second connecting plate. A positioning plate is provided on the outside of the guide frame.

2. A downhole casing centralizer according to claim 1, characterized in that: The number of the first screw and the second screw are both 4, and the first screw and the second screw are arranged at equal angles between the upper positioning ring and the lower positioning ring.

3. The downhole casing centralizer according to claim 1, characterized in that: The thread directions of the two ends of the first screw and the second screw are opposite.

4. The downhole casing centralizer according to claim 1, characterized in that: The driving mechanism includes a worm wheel and a worm that mesh with each other. The worm wheel is fixedly connected to the top of the single first screw, and one end of the worm is connected to a motor.

5. The downhole casing centralizer according to claim 1, characterized in that: The first connecting plates are rotatably connected to both sides of the first movable frame, and the connections between the upper and lower first connecting plates and the guide wheels are staggered.

6. The downhole casing centralizer according to claim 1, characterized in that: The rotation axis of the guide wheel is perpendicular to the connected first screw rod, and the guide wheel is located in the middle of the centralizer body.

7. The downhole casing centralizer according to claim 1, characterized in that: The second connecting plate is rotatably connected to both sides of the second movable frame, and the second connecting plate is rotatably connected to both sides of the guide frame. The middle position of the guide frame and the positioning plate is located in the middle of the stabilizer body, and the positioning plate is arranged parallel to the axial direction of the stabilizer body.

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