A resettable casing centralizer for cementing

Abstract

This invention discloses a resettable casing centralizer for cementing, relating to the technical field of casing centralizers. It includes an outer casing, characterized in that: both ends of the outer casing are provided with connecting rings, and compression rebound components are evenly arranged between the two sets of connecting rings. In use, this invention directly utilizes the functions of the compression rebound components and the support rebound components. Specifically, the second, third, and fourth guide wheels guide the wear-resistant guide belt in a sliding cyclic motion. Thus, when in contact with the wellbore, the wear-resistant guide belt does not directly rub against it, but rather experiences dynamic friction, thereby improving the wear resistance of the equipment and significantly extending its service life. Furthermore, during the compression process, the interaction of the memory plate, the elastic plate, and the first and second springs greatly enhances the compression rebound. Simultaneously, the wear-resistant guide belt remains taut throughout the compression process, preventing slackness and further improving the wear resistance of the equipment.

Description

Technical Field

[0001] This invention relates to the field of casing centralizer technology, specifically a resettable casing centralizer for cementing. Background Technology

[0002] In the process of oilfield exploration and development, cementing is a crucial step in the separation grouting process. After drilling is completed, casing is run into the well, and cement needs to be injected into the annular space between the casing and the formation to seal the loose formation, isolate the oil, gas and water layers, prevent cross-contamination, and ensure normal production of oil and gas wells and normal water injection of water injection wells to meet the needs of oil and gas development. At the same time, if the casing sealing of the producing formation is not up to standard, the cementing quality directly affects the benefits of oilfield exploration and development. Therefore, ensuring and improving cementing quality is a key link in the drilling and completion process. Centralizers are used to improve the centering of the casing in the well, make the annular space around the casing uniform, and ensure that the cement slurry returns at a symmetrical speed, thereby improving the cementing displacement efficiency and ensuring cementing quality. At the same time, using centralizers can also reduce casing sticking during casing running.

[0003] Currently, there are more and more types of casing centralizers. Among them, the elastic centralizer is good due to its deformable characteristics, easy to be installed in complex or small wellbore, relatively simple to process and manufacture, and good centralizing effect when the support force is sufficient.

[0004] However, during use, the elastic centralizer generates significant friction when it comes into contact with the well wall during downward pressure, resulting in prolonged friction and a substantial reduction in its lifespan. Furthermore, when replacement is needed, it must be removed, which greatly reduces overall work efficiency and thus fails to meet current usage requirements. Summary of the Invention

[0005] Based on this, the purpose of the present invention is to provide a resettable casing centralizer for cementing, in order to solve the technical problem that in the prior art, when the elastic centralizer contacts the well wall during pressing, a large frictional force is generated, which causes friction for a long time, greatly reducing the service life of the elastic centralizer. Moreover, when it needs to be replaced, it needs to be removed, which greatly reduces the overall work efficiency and thus cannot meet the current usage requirements.

[0006] To achieve the above objectives, the present invention provides the following technical solution: a resettable casing centralizer for cementing, comprising an outer casing, characterized in that: both ends of the outer casing are provided with connecting rings, and a compression rebound assembly is evenly arranged between two sets of connecting rings; an installation ring is provided on the outer side of the outer casing, and multiple sets of support rebound assemblies cooperating with the compression rebound assembly are evenly arranged on the outer side of the installation ring; the compression rebound assembly includes a first guide post, a first spring, a movable seat, a memory plate, a wear-resistant guide belt, and a fifth guide wheel; multiple sets of first guide posts are evenly arranged on one end of the connecting ring, and a first spring is provided on the outer side of the first guide post; the first guide post... Each set of movable seats is slidably connected to a first spring on its outer side, and a fifth guide wheel is provided at one end of each movable seat. A memory plate is connected between the two sets of movable seats through the fifth guide wheel. A wear-resistant guide belt that cooperates with the compression and rebound assembly is provided on the outer side of the memory plate. The support and rebound assembly includes an elastic plate, a guide sleeve, a second guide post, a second spring, and a first mounting base. Multiple sets of elastic plates are respectively installed on the outer side of the mounting ring. A guide sleeve is provided on the inner side of the elastic plate. A second spring is provided inside the guide sleeve. A second guide post is slidably connected to one end of the guide sleeve, and one end of the second guide post is connected to the second spring.

[0007] By adopting the above technical solution, the second, third, and fourth guide wheels can guide the wear-resistant guide belt in a sliding cyclic motion. Therefore, when in contact with the well wall, the wear-resistant guide belt does not directly rub against it, but rather experiences dynamic friction, thereby improving the wear resistance of the equipment and significantly extending its service life. Furthermore, during the extrusion process, the interaction of the memory plate, elastic plate, and the first and second springs greatly enhances the extrusion resilience. Simultaneously, the wear-resistant guide belt remains taut throughout the extrusion process, preventing it from loosening, further improving the wear resistance of the equipment.

[0008] The present invention is further configured such that an inner tube is provided inside the outer tube, and a bearing is provided between the outer tube and the inner tube.

[0009] By adopting the above technical solution and utilizing the function of the bearing, the outer tube and the inner tube can rotate during operation, which facilitates subsequent work.

[0010] The present invention is further configured such that the upper and lower ends of the outer sleeve are respectively connected by connecting rings to multiple sets of uniformly distributed first limiting guide plates and second limiting guide plates.

[0011] By adopting the above technical solution, the functions of the first and second limiting guide plates are utilized to ensure the normal operation of the memory plate and the wear-resistant guide belt, and to prevent damage.

[0012] The present invention is further configured such that a fourth guide wheel that cooperates with a wear-resistant guide belt is rotatably connected inside the memory board, mounting plates are symmetrically arranged on the outer side of the memory board, second guide wheels that cooperate with the wear-resistant guide belt are symmetrically arranged between the mounting plates, and a third guide wheel that cooperates with the wear-resistant guide belt is arranged inside the first mounting seat.

[0013] By adopting the above technical solution, the fourth guide wheel, the second guide wheel and the third guide wheel are used to facilitate the sliding of the wear-resistant guide belt, thereby completing the work.

[0014] The present invention is further configured such that each end of the elastic plate is provided with a second mounting seat, and the interior of the second mounting seat is provided with a first guide wheel that cooperates with the wear-resistant guide belt.

[0015] By adopting the above technical solution, the first guide wheel facilitates the sliding of the wear-resistant guide belt, thereby completing the work.

[0016] In summary, the present invention has the following beneficial effects: During use, the present invention directly utilizes the functions of the extrusion rebound assembly and the support rebound assembly. Specifically, the second, third, and fourth guide wheels guide the wear-resistant guide belt in a sliding cyclic motion. Thus, when in contact with the well wall, the wear-resistant guide belt does not directly rub against it, but rather experiences dynamic friction, thereby improving the wear resistance of the equipment and significantly extending its service life. Furthermore, during the extrusion process, the interaction of the memory plate, the elastic plate, and the first and second springs greatly enhances the extrusion rebound. Simultaneously, the wear-resistant guide belt remains taut throughout the extrusion process, preventing it from loosening, further improving the wear resistance of the equipment. Attached Figure Description

[0017] Figure 1 This is a schematic diagram of the structure of the present invention;

[0018] Figure 2 For the present invention Figure 1 Enlarged view of point A in the middle;

[0019] Figure 3 For the present invention Figure 2 Enlarged view of point B in the middle;

[0020] Figure 4 This is a schematic diagram of the cross-sectional structure of the present invention;

[0021] Figure 5 For the present invention Figure 4 Enlarged view of point C in the middle;

[0022] Figure 6 This is a partial structural schematic diagram of the present invention.

[0023] In the diagram: 1. Inner tube; 2. Outer tube; 3. Connecting ring; 4. First guide post; 5. First spring; 6. Movable seat; 7. Memory plate; 8. Wear-resistant guide belt; 9. Mounting ring; 10. First limiting guide plate; 11. Second limiting guide plate; 12. Bearing; 13. Elastic plate; 14. Guide sleeve; 15. Second guide post; 16. Second spring; 17. First mounting seat; 18. Mounting plate; 19. Second mounting seat; 20. First guide wheel; 21. Second guide wheel; 22. Third guide wheel; 23. Fourth guide wheel; 24. Fifth guide wheel. Detailed Implementation

[0024] The following will be combined with the accompanying drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain the present invention, and should not be understood as limiting the present invention.

[0025] The following describes an embodiment of the present invention based on its overall structure.

[0026] A resettable casing centralizer for cementing, such as Figure 1-5As shown, the device includes an outer sleeve 2. Its key feature is that both ends of the outer sleeve 2 are equipped with connecting rings 3. The connecting rings 3 facilitate the installation of the compression rebound assembly, which in turn facilitates the straightening of the outer sleeve 2 within the wellbore. The compression rebound assembly includes a first guide post 4, a first spring 5, a movable seat 6, a memory plate 7, a wear-resistant guide belt 8, and a fifth guide wheel 24. Specifically, when the memory plate 7 is compressed within the wellbore wall, multiple sets of first guide posts 4 are evenly arranged at one end of each connecting ring 3, and a first spring 5 is provided on the outer side of each first guide post 4. This causes the memory plate 7 to move up and down along the outer side of the first guide post 4 at both ends, and cooperates with the first spring 5 to allow the memory plate 7 to recover. The outer side of each of the first guide posts 4 is slidably connected to a movable seat 6 that cooperates with the first spring 5, and one end of each movable seat 6 is equipped with a fifth guide wheel 24. The memory plate 7 is connected to each of the two sets of movable seats 6 via the fifth guide wheel 24. The outer side of the memory plate 7 is equipped with a wear-resistant guide belt 8 that cooperates with the compression and rebound assembly. The wear-resistant guide belt 8 facilitates movement when the outer sleeve 2 moves downwards, thereby ensuring the memory plate 7 recovers. The static friction is transformed into relative dynamic friction, thus greatly extending the service life of the equipment. Extrusion and rebound components are evenly arranged between the two sets of connecting rings 3. An installation ring 9 is provided on the outer side of the outer sleeve 2. Multiple sets of support and rebound components that cooperate with the extrusion and rebound components are evenly arranged on the outer side of the installation ring 9. The support and rebound components include an elastic plate 13, a guide sleeve 14, a second guide post 15, a second spring 16, and a first mounting base 17. Multiple sets of elastic plates 13 are respectively installed on the outer side of the installation ring 9. When the memory plate 7 deforms, the elastic plate 13 acts as a support and rebound component, which is then applied to the first guide wheel 20. When compressed, the elastic plate 13 deforms simultaneously, thereby improving the compressive strength of the memory plate 7. A guide sleeve 14 is provided on the inner side of the elastic plate 13, and a second spring 16 is provided inside the guide sleeve 14. A second guide post 15 is slidably connected to one end of the guide sleeve 14, and one end of the second guide post 15 is connected to the second spring 16. While being compressed, the second spring 16 is in a stretched state, and together with the first mounting seat 17 and the third guide wheel 22, the wear-resistant guide belt 8 is always in a taut state, thus better ensuring its contact with the well wall.

[0027] Please see Figure 1 The outer tube 2 has an inner tube 1 inside, and a bearing 12 is provided between the outer tube 2 and the inner tube 1. The bearing 12 allows the outer tube 2 and the inner tube 1 to rotate during operation, which is convenient for subsequent work.

[0028] Please see Figure 1The upper and lower ends of the outer tube 2 are respectively connected to multiple sets of evenly distributed first limiting guide plates 10 and second limiting guide plates 11 through connecting rings 3. The function of the first limiting guide plates 10 and second limiting guide plates 11 is to ensure the normal operation of the memory plate 7 and the wear-resistant guide belt 8, and to avoid damage.

[0029] Please see Figure 1 The memory plate 7 has a fourth guide wheel 23 rotatably connected inside, which cooperates with the wear-resistant guide belt 8. The outer side of the memory plate 7 is symmetrically provided with mounting plates 18, and the mounting plates 18 are symmetrically provided with second guide wheels 21 that cooperate with the wear-resistant guide belt 8. The first mounting seat 17 is provided with a third guide wheel 22 that cooperates with the wear-resistant guide belt 8. The fourth guide wheel 23, the second guide wheel 21 and the third guide wheel 22 facilitate the sliding of the wear-resistant guide belt 8 to complete the work. The end of the elastic plate 13 is provided with a second mounting seat 19. The second mounting seat 19 is provided with a first guide wheel 20 that cooperates with the wear-resistant guide belt 8. The first guide wheel 20 facilitates the sliding of the wear-resistant guide belt 8 to complete the work.

[0030] Although an embodiment of the present invention has been shown and described, this specific embodiment is merely an explanation of the present invention and is not a limitation of the invention. The specific features, structures, materials or characteristics described may be combined in an appropriate manner in any one or more embodiments or examples. After reading this specification, those skilled in the art may make modifications, substitutions and variations to the embodiment without creative contribution as needed without departing from the principles and purpose of the present invention. However, as long as they are within the scope of the claims of the present invention, they are protected by patent law.

Claims

1. A resettable casing centralizer for cementing, comprising an outer casing (2), characterized in that: Both ends of the outer tube (2) are provided with connecting rings (3), and extrusion spring components are evenly arranged between the two sets of connecting rings (3). An installation ring (9) is provided on the outer side of the outer tube (2), and multiple sets of support spring components that cooperate with the extrusion spring components are evenly arranged on the outer side of the installation ring (9). The extrusion spring components include a first guide post (4), a first spring (5), a movable seat (6), a memory plate (7), a wear-resistant guide belt (8), and a fifth guide wheel (24). Multiple sets of first spring components are evenly arranged on one end of the connecting ring (3). The guide post (4) has a first spring (5) on its outer side. The outer side of the first guide post (4) is slidably connected to a movable seat (6) that cooperates with the first spring (5). One end of each movable seat (6) is provided with a fifth guide wheel (24). The two sets of movable seats (6) are connected to a memory plate (7) through the fifth guide wheel (24). The outer side of the memory plate (7) is provided with a wear-resistant guide belt (8) that cooperates with the compression rebound assembly. The support rebound assembly includes an elastic plate (13) and a guide sleeve (14). 4) The second guide post (15), the second spring (16), and the first mounting base (17) are provided. Multiple sets of elastic plates (13) are installed on the outer side of the mounting ring (9). A guide sleeve (14) is provided on the inner side of the elastic plate (13). The second spring (16) is provided inside the guide sleeve (14). The second guide post (15) is slidably connected to one end of the guide sleeve (14), and one end of the second guide post (15) is connected to the second spring (16). The memory plate (7) is rotatably connected to the wear-resistant guide post. The fourth guide wheel (23) is matched with the belt (8). The memory plate (7) is symmetrically provided with mounting plates (18). The mounting plates (18) are symmetrically provided with second guide wheels (21) that match the wear-resistant guide belt (8). The first mounting seat (17) is provided with a third guide wheel (22) that matches the wear-resistant guide belt (8). The ends of the elastic plate (13) are all provided with second mounting seats (19). The second mounting seat (19) is provided with a first guide wheel (20) that matches the wear-resistant guide belt (8).

2. The resettable casing centralizer for cementing according to claim 1, characterized in that: The outer tube (2) is provided with an inner tube (1), and a bearing (12) is provided between the outer tube (2) and the inner tube (1).

3. The resettable casing centralizer for cementing according to claim 1, characterized in that: The outer tube (2) is connected to multiple sets of evenly distributed first limiting guide plates (10) and second limiting guide plates (11) at its upper and lower ends via connecting rings (3).

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