Resettable casing centralizer for well cementation

Abstract

The invention discloses a resettable casing centralizer for well cementation, and relates to the technical field of casing centralizers, the resettable casing centralizer for well cementation comprises an outer casing, and is characterized in that connecting rings are arranged at two ends of the outer casing, and extrusion springback components are uniformly arranged between the two groups of connecting rings. When the device is used, the effects of the extrusion springback assembly and the supporting springback assembly are directly utilized, specifically, the effects of the second guide wheel, the third guide wheel, the fourth guide wheel and the fourth guide wheel are utilized, so that the abrasion-resistant guide belt does not directly rub with the well wall but is in dynamic friction with the well wall; in the extrusion process, under the interaction of a memory plate, an elastic plate, a first spring and a second spring, the extrusion rebound resilience is greatly improved, meanwhile, the abrasion-resistant guide belt is always kept in a tight state in the extrusion process and is not loosened, and the service life of the equipment is greatly prolonged. The wear resistance of the equipment is further improved.

Description

Technical Field

[0001] The invention relates to the technical field of casing centralizers, in particular to a resettable casing centralizer for cementing. Background Art

[0002] In the process of oilfield exploration and development, cementing is an important part of the separation grouting work. After drilling is completed, casing is lowered into the well. Cement needs to be injected into the annular space between the casing and the formation to seal the loose formation and isolate the oil, gas and water layers to prevent mutual communication, ensure the normal production of oil and gas wells, and the normal injection of water wells to meet the needs of oil and gas development. At the same time, once the sealing of the production layer casing is unqualified, the cementing quality is directly related to the benefits of oilfield exploration and development. Therefore, ensuring and improving the cementing quality is a key link in the drilling and completion process. The centralizer is to improve the centering of the casing in the well, make the annular space around the casing uniform, and make the cement slurry return speed symmetrical all around, so as to improve the cementing displacement efficiency and ensure the cementing quality. At the same time, the use of the centralizer during casing lowering can also reduce the sticking of the casing during the casing lowering process.

[0003] At present, there are more and more types of casing centralizers, among which elastic centralizers are easy to run into complex or small wellbores due to their deformable characteristics, relatively simple processing and manufacturing, and good centralizing effect when the supporting force is sufficient.

[0004] However, when in use, the elastic stabilizer generates a large friction force when in contact with the well wall when pressed down, resulting in long-term friction, which greatly reduces the service life of the elastic stabilizer. When it needs to be replaced, it needs to be taken out, which greatly reduces the overall work efficiency. Therefore, it cannot meet the existing use requirements. Summary of the invention

[0005] Based on this, the purpose of the present invention is to provide a resettable casing centralizer for cementing, so as to solve the technical problem in the prior art that when pressed down, the elastic centralizer will generate a large friction force when in contact with the well wall, thereby causing long-term friction, which greatly reduces the service life of the elastic centralizer, and when it needs to be replaced, it needs to be taken out, which greatly reduces the overall work efficiency, and therefore cannot meet the existing technical problems of use requirements.

[0006] To achieve the above-mentioned purpose, the present invention provides the following technical solutions: a resettable casing centralizer for cementing, comprising an outer casing, characterized in that: connecting rings are arranged at both ends of the outer casing, extrusion rebound components are evenly arranged between two groups of the connecting rings, a mounting ring is arranged on the outer side of the outer casing, and multiple groups of support rebound components matching the extrusion rebound components are evenly arranged on the outer side of the mounting ring, the extrusion rebound components include a first guide column, a first spring, a movable seat, a memory plate, a wear-resistant guide belt and a fifth guide wheel, multiple groups of first guide columns are evenly arranged on one end of the connecting ring, a first spring is arranged on the outer side of the first guide column, The outer sides are all slidably connected with a movable seat that cooperates with the first spring, and one end of the movable seat is provided with a fifth guide wheel, and a memory plate is connected between the two groups of movable seats through the fifth guide wheel, and a wear-resistant guide belt that cooperates with the extrusion rebound component is provided on the outer side of the memory plate. The support rebound component includes an elastic plate, a guide sleeve, a second guide column, a second spring and a first mounting seat, and multiple groups 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, and a second spring is provided inside the guide sleeve, and one end of the guide sleeve is provided with a second guide column slidably connected to it, and one end of the second guide column is connected to the second spring.

[0007] By adopting the above technical scheme, the second guide wheel, the third guide wheel, the fourth guide wheel and the fourth guide wheel can be used to guide the wear-resistant guide belt to slide in a circular motion. When the wear-resistant guide belt contacts the well wall, it does not directly rub against it, but dynamically rubs against it, thereby improving the wear resistance of the equipment, thereby greatly extending the service life of the equipment. In addition, during the extrusion process, the memory plate, the elastic plate and the interaction between the first spring and the second spring greatly improve the extrusion resilience. At the same time, the wear-resistant guide belt always remains taut during the extrusion process and does not relax, thereby further improving the wear resistance of the equipment.

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

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

[0010] The present invention is further configured such that the upper and lower ends of the outer sleeve are respectively connected with a plurality of groups of evenly distributed first limiting guide plates and second limiting guide plates through connecting rings.

[0011] By adopting the above technical solution and utilizing the functions of the first limiting guide plate and the second limiting guide plate, it is convenient to ensure that the memory plate and the wear-resistant guide belt work normally and avoid being crushed.

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

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

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

[0015] By adopting the above technical solution and utilizing the function of the first guide wheel, the wear-resistant guide belt can be easily slid to complete the work.

[0016] To sum up, the present invention mainly has the following beneficial effects: when in use, the present invention directly utilizes the functions of the extrusion rebound component and the support rebound component, specifically utilizes the functions of the second guide wheel, the third guide wheel, the fourth guide wheel and the fourth guide wheel to guide the wear-resistant guide belt to slide in a circular motion. Therefore, when in contact with the well wall, the wear-resistant guide belt does not directly rub against it, but dynamically rubs against it, thereby improving the wear resistance of the equipment, thereby greatly extending the service life of the equipment, and in the process of extrusion, the memory plate, the elastic plate and the interaction between the first spring and the second spring greatly improve the extrusion rebound elasticity, and at the same time, the wear-resistant guide belt always remains taut during the extrusion process and does not relax, thereby further improving the wear resistance of the equipment. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 It is a structural schematic diagram of the present invention;

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

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

[0020] Figure 4 It is a schematic diagram of the cutaway 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 It is a partial structural schematic diagram of the present invention.

[0023] In the figure: 1. inner tube; 2. outer tube; 3. connecting ring; 4. first guide column; 5. first spring; 6. movable seat; 7. memory plate; 8. wear-resistant guide belt; 9. mounting ring; 10. first limit guide plate; 11. second limit guide plate; 12. bearing; 13. elastic plate; 14. guide sleeve; 15. second guide column; 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 DESCRIPTION

[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 cannot 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, it includes an outer sleeve 2, which is characterized in that: both ends of the outer sleeve 2 are provided with connecting rings 3, and the function of the connecting rings 3 is used to facilitate the installation of the extrusion rebound component, and then the function of the extrusion rebound component is used to facilitate the completion of the outer sleeve 2 in the well. The extrusion rebound component includes a first guide column 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 squeezed in the well wall, one end of the connecting ring 3 is evenly provided with multiple groups of first guide columns 4, and the outer side of the first guide column 4 is provided with a first spring 5. The two ends of the memory plate 7 are moved up and down along the outer side of the first guide column 4, and the memory plate 7 is restored in cooperation with the first spring 5. The outer side of the first guide column 4 is slidably connected with a movable seat 6 that cooperates with the first spring 5, and one end of the movable seat 6 is provided with a fifth guide wheel 24. The two groups of movable seats 6 are connected with the 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 extrusion rebound component. The wear-resistant guide belt 8 is used to facilitate the movement of the wear-resistant guide belt 8 when the outer sleeve 2 moves downward, so as to Static friction is changed into relative dynamic friction to greatly extend the service life of the equipment. An extrusion rebound component is evenly arranged between the two groups of connecting rings 3. A mounting ring 9 is arranged on the outside of the outer sleeve 2. Multiple groups of support rebound components matching the extrusion rebound component are evenly arranged on the outside of the mounting ring 9. The support rebound component includes an elastic plate 13, a guide sleeve 14, a second guide column 15, a second spring 16 and a first mounting seat 17. Multiple groups of elastic plates 13 are respectively installed on the outside of the mounting ring 9. When the memory plate 7 is deformed by the action of the elastic plate 13, the first guide wheel 20 is used to move the memory plate 7. Under the use, the elastic plate 13 is deformed at the same time, so as to improve the compression resistance of the memory plate 7, a guide sleeve 14 is arranged on the inner side of the elastic plate 13, a second spring 16 is arranged inside the guide sleeve 14, one end of the guide sleeve 14 is provided with a second guide column 15 slidably connected thereto, and one end of the second guide column 15 is connected to the second spring 16, and at the same time of squeezing, since the second spring 16 is in a stretched state, combined with the first mounting seat 17 and the third guide wheel 22, the wear-resistant guide belt 8 is always in a taut state, thereby better ensuring its contact with the well wall.

[0027] See also Figure 1 An inner tube 1 is arranged inside the outer sleeve 2, and a bearing 12 is arranged between the outer sleeve 2 and the inner tube 1. By utilizing the function of the bearing 12, the outer sleeve 2 and the inner tube 1 can rotate during work, so as to facilitate subsequent work.

[0028] See also Figure 1The upper and lower ends of the outer sleeve 2 are respectively connected to multiple groups of evenly distributed first limiting guide plates 10 and second limiting guide plates 11 through connecting rings 3. The first limiting guide plates 10 and the second limiting guide plates 11 are used to ensure the normal operation of the memory plate 7 and the wear-resistant guide belt 8 and avoid damage.

[0029] See also Figure 1 The memory plate 7 is internally rotatably connected with a fourth guide wheel 23 that cooperates with the wear-resistant guide belt 8, the memory plate 7 is symmetrically provided with mounting plates 18 on the outside, and second guide wheels 21 that cooperate with the wear-resistant guide belt 8 are symmetrically provided between the mounting plates 18. The first mounting seat 17 is internally 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 are utilized to 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, and the second mounting seat 19 is internally provided with a first guide wheel 20 that cooperates with the wear-resistant guide belt 8. The first guide wheel 20 is utilized to facilitate 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 a suitable 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 embodiments without creative contributions 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 sleeve (2) are provided with connecting rings (3), and extrusion rebound components are evenly arranged between the two groups of connecting rings (3). The outer side of the outer sleeve (2) is provided with a mounting ring (9), and the outer side of the mounting ring (9) is evenly provided with multiple groups of support rebound components that match the extrusion rebound components. The extrusion rebound components include a first guide column (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). One end of the connecting ring (3) is evenly provided with multiple groups of first guide columns (4), the outer side of the first guide column (4) is provided with a first spring (5), the outer side of the first guide column (4) is slidably connected with a movable seat (6) that matches the first spring (5), and one end of the movable seat (6) is provided with A fifth guide wheel (24), a memory plate (7) is connected between the two groups of movable seats (6) through the fifth guide wheel (24), a wear-resistant guide belt (8) matched with the extrusion rebound component is arranged on the outer side of the memory plate (7), the support rebound component comprises an elastic plate (13), a guide sleeve (14), a second guide column (15), a second spring (16) and a first mounting seat (17), a plurality of groups of elastic plates (13) are respectively installed on the outer side of the mounting ring (9), a guide sleeve (14) is arranged on the inner side of the elastic plate (13), a second spring (16) is arranged inside the guide sleeve (14), one end of the guide sleeve (14) is provided with a second guide column (15) slidably connected thereto, and one end of the second guide column (15) is connected to the second spring (16).

2. The resettable cementing casing centralizer according to claim 1, characterized in that: An inner tube (1) is arranged inside the outer sleeve (2), and a bearing (12) is arranged between the outer sleeve (2) and the inner tube (1).

3. The resettable cementing casing centralizer according to claim 1, characterized in that: The upper and lower ends of the outer sleeve (2) are respectively connected to a plurality of groups of evenly distributed first limit guide plates (10) and second limit guide plates (11) via connecting rings (3).

4. The resettable cementing casing centralizer according to claim 1, characterized in that: The memory plate (7) is internally rotatably connected to a fourth guide wheel (23) that matches the wear-resistant guide belt (8); mounting plates (18) are symmetrically arranged on the outer side of the memory plate (7); second guide wheels (21) that match the wear-resistant guide belt (8) are symmetrically arranged between the mounting plates (18); and a third guide wheel (22) that matches the wear-resistant guide belt (8) is arranged inside the first mounting seat (17).

5. The resettable cementing casing centralizer according to claim 1, characterized in that: The ends of the elastic plates (13) are each provided with a second mounting seat (19), and the interior of the second mounting seat (19) is provided with a first guide wheel (20) that matches the wear-resistant guide belt (8).

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