Centralizer of well cementation quality detector

Abstract

The utility model discloses a centralizer of a well cementation quality detector, and belongs to the field of energy exploitation. The centralizer comprises two groups of arc-shaped ferrules and an elastic component, the arc-shaped ferrule comprises a plurality of first connecting pieces and second connecting pieces which are inserted end to end; racks are fixedly arranged at the front end and the rear end of the first connecting piece, grooves are formed in the second connecting pieces in a penetrating mode, the racks are inserted into the grooves of the adjacent second connecting pieces, and the elastic components are arranged in the grooves. The elastic component comprises a stop block, a connecting shaft, a connecting block and a torsional spring; the connecting shaft penetrates through the check block and is fixedly connected with the check block; the inner ends and the outer ends of the torsion springs are fixedly connected with the outer wall of the connecting shaft and the inner wall of the groove respectively; the tail end of one side of the connecting shaft penetrates through and extends out of one side of the second connecting piece, and the connecting block is fixed to the tail end of the side of the connecting shaft. The centering device is used for solving the problems that an existing centering device is fixed in size, cannot be flexibly adjusted and cannot adapt to pipe bodies of different sizes, and friction damage is prone to being generated when the centering device passes through a well wall.

Description

Technical Field

[0001] This utility model belongs to the field of energy extraction and relates to a centralizer for a cementing quality testing instrument. Background Technology

[0002] In the process of oil and gas energy extraction, cementing operations are a crucial step. Cementing quality directly affects the lifespan, production, and safety of oil wells. Traditional cementing quality testing instruments often suffer from inaccurate positioning and are easily deflected by the wellbore, thus affecting the accuracy of the test results. Cementing quality testing instruments are important equipment for testing the cementing quality of oil and gas wells. Their centralizers, as key components, play a vital role in ensuring the instrument operates centered in the wellbore and obtains accurate test data. As the development depth of oil and gas wells continues to increase and the wellbore environment becomes increasingly complex, the performance requirements for the centralizers of cementing quality testing instruments are also becoming increasingly stringent.

[0003] The current cementing quality inspection instrument's centralizer is a device installed on the cementing quality inspection instrument or casing string. Its main function is to keep the inspection instrument or casing in a centered position in the wellbore. During the cementing process, the centering of the casing string is crucial to ensuring that the cement slurry is evenly distributed between the casing and the well wall. However, it often has the problem of fixed size and inability to adapt to different sizes of casing, which to some extent limits the scope of application and inspection effect of the inspection instrument.

[0004] Therefore, there is an urgent need to develop a cementing quality inspection instrument centralizer that is simple in structure, easy to adjust, and has anti-damage function to meet the cementing quality inspection needs of different well diameters and pipe sizes. Utility Model Content

[0005] In order to overcome the shortcomings of the prior art, the purpose of this utility model is to provide a centralizer for a cementing quality testing instrument, which improves the problems of the existing centralizer having fixed size and being unable to be flexibly adjusted, unable to adapt to different sizes of pipe bodies, and the problem of friction damage easily occurring when the centralizer travels through the well wall.

[0006] To achieve the above objectives, the present invention adopts the following technical solution:

[0007] This utility model provides a centralizer for a cementing quality testing instrument, comprising two sets of arc-shaped collars and a tensioning component. Each arc-shaped collar includes several first and second connecting members that are interlocked end-to-end. A rack is fixedly installed at both ends of the first connecting member. A groove is formed through the second connecting member, and the rack is inserted into the groove of an adjacent second connecting member. The tensioning component is located inside the groove. The tensioning component includes a stop block, a connecting shaft, a connecting block, and a torsion spring. The connecting shaft passes through the stop block and is fixedly connected to it. Two torsion springs are sleeved on the left and right ends of the connecting shaft, with the inner and outer ends of the torsion springs fixedly connected to the outer wall of the connecting shaft and the inner wall of the groove, respectively. One end of the connecting shaft extends through and to the outside of one side of the second connecting member, and the connecting block is fixed to that end of the connecting shaft.

[0008] Preferably, in each set of arc-shaped collars, a first roller is provided at the middle position of the side of the two sets of first connectors that contact the tube body, and a part of the first roller extends to the outside of the surface of the first connector and fits tightly against the outer surface of the tube body.

[0009] Furthermore, it also includes a damage prevention component disposed between the two sets of arc-shaped collars. The damage prevention component includes four arc-shaped plates and four sets of sliding buffer components disposed on the inner side of the four arc-shaped plates; the four arc-shaped plates are arranged in a ring around the outside of the tube body in pairs.

[0010] Preferably, the two sides of one set of two opposing arc-shaped plates are respectively hinged to the first connecting members corresponding to the two sets of arc-shaped collars, and the two sides of the other set of two opposing arc-shaped plates are respectively hinged to the second connecting members corresponding to the two sets of arc-shaped collars.

[0011] Furthermore, the sliding buffer component includes a spring, two first connecting plates, and a second connecting plate; the two first connecting plates are respectively fixedly connected to the opposite first connecting member or second connecting member in the two sets of arc-shaped collars, and the second connecting plate is slidably disposed between the two first connecting plates; the upper and lower ends of the spring are respectively fixedly connected to the arc-shaped plate and the second connecting plate located below the arc-shaped plate.

[0012] Preferably, the upper surface of the first connecting plate is provided with a track that cooperates with the protrusion on the lower surface of the second connecting plate.

[0013] Furthermore, several evenly arranged second rollers are provided through the arc-shaped plate.

[0014] Preferably, a limiting component is provided on each side of the straightener, and the limiting component consists of two sets of clamps that hug each other.

[0015] Furthermore, one set of clamps has bolts fixed at both ends, and the other set of clamps has bolt holes through both ends; the bolts on one set of clamps pass through the bolt holes on the other set of clamps and are then fixed by nuts.

[0016] Preferably, the rack is made of copper alloy.

[0017] Compared with the prior art, the present invention has the following beneficial effects:

[0018] This invention provides a centralizer for a cementing quality testing instrument. A rack connects a first connector and a second connector to form an arc-shaped collar. By pushing the second connector, the rack enters a groove within it. After adjustment to the appropriate size, if the rack is to be pulled out of the groove, a stop block, under the action of a torsion spring, engages the rack to prevent it from loosening. This solves the problem of fixed-size centralizers that cannot be flexibly adjusted. It improves the applicability and testing effect of the cementing quality testing instrument by addressing the issue of fixed-size centralizers that cannot be flexibly adjusted to accommodate different pipe sizes.

[0019] Furthermore, by setting a second roller on the outer surface of the arc-shaped plate, friction is reduced when the centralizer moves in the well wall. When the centralizer encounters a protrusion or a narrow section in the well wall, it is squeezed and contracts inward. When the arc-shaped plate is deformed by the compression, the force is reduced by the sliding between the first connecting plate and the second connecting plate and the spring. After passing the protrusion, the arc-shaped plate springs back to its original shape, which solves the problem of friction damage that easily occurs when the centralizer travels in the well wall.

[0020] Compared with the prior art, the centralizer of this utility model can flexibly adjust its size to adapt to pipes of different sizes. At the same time, the anti-damage component effectively reduces friction damage when passing through the well wall, thereby improving the service life and working efficiency of the centralizer. Attached Figure Description

[0021] Figure 1 This is a perspective view of the centralizer of a cementing quality testing instrument proposed in this utility model.

[0022] Figure 2 This is a schematic diagram of the arc-shaped collar of the centralizer in a cementing quality testing instrument proposed in this utility model.

[0023] Figure 3 This is a schematic diagram of the structure of the first roller of the centralizer in a cementing quality testing instrument proposed in this utility model.

[0024] Figure 4 This is a schematic diagram of the structure of the stop block, connecting shaft, connecting block and torsion spring of the centralizer of a cementing quality testing instrument proposed in this utility model;

[0025] Figure 5 This is another three-dimensional schematic diagram of the centralizer of a cementing quality testing instrument proposed in this utility model;

[0026] Figure 6This is another three-dimensional schematic diagram of the centralizer of a cementing quality testing instrument proposed in this utility model;

[0027] Figure 7 This is a schematic diagram of the arc-shaped plate of the centralizer in a cementing quality testing instrument proposed in this utility model.

[0028] Figure 8 This is a schematic diagram of the clamp of the centralizer in a cementing quality testing instrument proposed in this utility model;

[0029] Figure 9 This is a structural schematic diagram of the anti-damage component of the centralizer of a cementing quality testing instrument proposed in this utility model.

[0030] Wherein: 1-pipe body; 2-first connector; 3-second connector; 4-rack; 5-first roller; 6-stop; 7-connecting shaft; 8-connecting block; 9-torsion spring; 10-arc plate; 11-second roller; 12-spring; 13-first connecting plate; 14-second connecting plate; 15-clamp; 16-bolt; 17-nut; 18-groove. Detailed Implementation

[0031] To enable those skilled in the art to better understand the present invention, the technical solutions of the present invention 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 invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort should fall within the protection scope of the present invention.

[0032] It should be noted that the terms "first," "second," etc., in the specification, claims, and accompanying drawings of this utility model are used to distinguish similar objects and are not necessarily used to describe a specific order or sequence. It should be understood that such data can be interchanged where appropriate so that the embodiments of the utility model described herein can be implemented in orders other than those illustrated or described herein. Furthermore, the terms "comprising" and "having," and any variations thereof, are intended to cover non-exclusive inclusion; for example, a process, method, system, product, or apparatus that comprises a series of steps or units is not necessarily limited to those steps or units explicitly listed, but may include other steps or units not explicitly listed or inherent to such processes, methods, products, or apparatus.

[0033] In order to overcome the problems of existing centralizers having fixed dimensions and being unable to be flexibly adjusted to adapt to different sizes of pipe bodies 1, and the problem of friction damage easily occurring when the centralizer travels through the well wall, this utility model provides a centralizer for a cementing quality testing instrument.

[0034] The present invention will now be described in further detail with reference to the accompanying drawings:

[0035] Example 1

[0036] like Figures 1-9 As shown, this embodiment provides a centralizer for a cementing quality testing instrument, mainly comprising two sets of arc-shaped collars and a tensioning component. Each set of arc-shaped collars includes two first connecting pieces 2 and two second connecting pieces 3 that are inserted end-to-end, as shown... Figure 2 As shown, each set of arc-shaped collars consists of two first connecting parts 2 (top and bottom) and two second connecting parts 3 (left and right) inserted end to end. Two sets of arc-shaped collars are mounted on the pipe body 1.

[0037] like Figure 2 and Figure 3 As shown, racks 4 are fixedly installed at both ends of the first connector 2, as follows: Figure 4 As shown, a groove 18 is formed through the second connector 3, and a rack 4 is inserted into the groove 18 of the adjacent second connector 3. The tightening component is set inside the groove 18.

[0038] like Figure 4 As shown, the tensioning component includes a stop block 6, a connecting shaft 7, a connecting block 8, and torsion springs 9. The connecting shaft 7 passes through the stop block 6 and is fixedly connected to the stop block 6. Two torsion springs 9 are sleeved on the left and right ends of the connecting shaft 7, and the inner and outer ends of the torsion springs 9 are fixedly connected to the outer wall of the connecting shaft 7 and the inner wall of the groove 18, respectively. One end of the connecting shaft 7 passes through and extends to the outside of one side of the second connecting member 3, and the connecting block 8 is fixed to this end of the connecting shaft 7, located outside the second connecting member 3.

[0039] In this embodiment, two sets of arc-shaped collars are respectively disposed on the tube body 1. The first connector 2 and the second connector 3 are both arc-shaped structures. Multiple first connectors 2 and second connectors 3 are connected end to end to form a complete ring structure that surrounds the outside of the tube body 1.

[0040] The first connector 2 has racks 4 fixedly installed at both its front and rear ends. The racks are strip-shaped and have multiple teeth. The racks 4 are fixed to the front and rear sides of the first connector 2. The second connector 3 has a through groove 18 that extends through its top and bottom. The racks on the first connector 2 are inserted into the grooves 18 of two adjacent second connectors 3, allowing the first connector 2 and the second connector 3 to be inserted end to end.

[0041] See Figure 2 and Figure 4The tensioning components are located inside the groove 18 of the second connector 3. Two sets of tensioning components are respectively located near the top and bottom of the groove 18. The tensioning components include a stop block 6, a connecting shaft 7, a connecting block 8, and torsion springs 9. The stop block 6 is a cuboid structure entirely located inside the groove 18. The connecting shaft 7 is a cylindrical structure that passes through the stop block 6 and is fixedly connected to it. Two torsion springs 9 are sleeved on the left and right ends of the connecting shaft 7. The inner end of the torsion spring 9 is fixedly connected to the outer wall of the connecting shaft 7, and the outer end of the torsion spring 9 is fixedly connected to the inner wall of the groove 18. One end of the connecting shaft 7 extends through and to the outside of one side of the second connector 3, and the connecting block 8 is fixed to this end of the connecting shaft 7. The connecting block 8 is a cuboid structure, and one side of the connecting block 8 is fixedly connected to the end of the connecting shaft 7.

[0042] See Figure 3 In each set of arc-shaped collars, a first roller 5 is provided at the center of the side of the first connecting member 2 that contacts the tube body 1. A portion of the first roller 5 extends beyond the surface of the first connecting member 2 and fits tightly against the outer surface of the tube body 1. The first roller 5 has a cylindrical structure. The tight fit between the first roller 5 and the outer surface of the tube body 4 allows the first connecting member 2 to roll on the outer surface of the tube body 1, reducing the friction between the first connecting member 2 and the tube body 1.

[0043] The centralizer of the cementing quality testing instrument in this embodiment also includes a damage prevention component disposed between two sets of arc-shaped collars. The damage prevention component includes four arc-shaped plates 10 and four sets of sliding buffer components disposed inside the four arc-shaped plates 10.

[0044] See Figure 5 , Figure 6 and Figure 7 , Figure 9 The arc plate 10 has an arc-shaped structure, and the four arc plates 10 are arranged in a ring around the outside of the tube body 1 in pairs.

[0045] One set of two opposing arc-shaped plates 10 are hinged to the first connecting piece 2 corresponding to the two sets of arc-shaped collars on both sides, and the other set of two opposing arc-shaped plates 10 are hinged to the second connecting piece 3 corresponding to the two sets of arc-shaped collars on both sides.

[0046] The sliding buffer component includes multiple springs 12, two first connecting plates 13, and one second connecting plate 14. The two first connecting plates 13 are respectively fixedly connected to the corresponding first connecting member 2 or second connecting member 3 in two sets of arc-shaped collars. The second connecting plate 14 is slidably disposed between the two first connecting plates 13. The upper and lower ends of the springs 12 are respectively fixedly connected to the arc-shaped plate 10 and the second connecting plate 14 located below the arc-shaped plate 10. The first connecting plate 13 has a cuboid structure, and one end of the first connecting plate 13 is fixedly connected to the first connecting member 2 or the second connecting member 3. The second connecting plate 14 has a cuboid structure and is slidably disposed between the two first connecting plates 13. The springs 12 are helical springs, with the upper end of the spring 12 fixedly connected to the arc-shaped plate 10 and the lower end of the spring 12 fixedly connected to the second connecting plate 14.

[0047] The upper surface of the first connecting plate 13 is provided with a track that cooperates with the protrusion on the lower surface of the second connecting plate 14, and the second connecting plate 14 can slide along the track.

[0048] A plurality of evenly arranged second rollers 11 are provided through the arc-shaped plate 10. The second rollers 11 have a cylindrical structure.

[0049] See Figure 8 Each side of the stabilizer is provided with a limiting component, which consists of two sets of interlocking clamps 15. The clamps 15 have an arc-shaped structure, and the two sets of clamps 15 interlock to form a complete ring structure that surrounds the outside of the pipe body 1.

[0050] One set of clamps 15 has bolts 16 fixed at both ends, and another set of clamps 15 has bolt holes extending through both ends. The bolts 16 on one set of clamps 15 pass through the bolt holes on the other set of clamps 15 and are secured by nuts 17. The bolts 16 are cylindrical, with one end fixed to both ends of one clamp 15. The bolt holes are circular and located at both ends of the other clamp 15. The nuts 17 are hexagonal and work in conjunction with the bolts 16 to secure the two sets of clamps 15 together.

[0051] Example 2

[0052] Reference Figures 1-9This embodiment provides a centralizer for a cementing quality testing instrument, comprising a tube body 1. Four first connecting members 2 are provided on the outer surface of the tube body 1, and four second connecting members 3 are provided on the outer surface of the tube body 1. The four first connecting members 2 are paired together to form two sets of arc-shaped collars with another four sets of second connecting members 3. Two first rollers 5 are rotatably connected to opposite sides of two adjacent first connecting members 2. Racks 4 are fixedly connected to both the front and rear sides of the first connecting members 2. A groove 18 is provided through the top and bottom of the second connecting member 3. Two connecting shafts 7 are rotatably connected to the inner wall between the top and bottom of the groove 18. A stop block 6 is fixedly connected to the outer surface of the connecting shaft 7, i.e., the connecting shaft 7 passes through the stop block 6. A torsion spring 9 is sleeved at both ends of the connecting shaft 7. Connecting blocks 8 are fixedly connected to opposite sides of two adjacent connecting shafts 7. A damage prevention component is provided on the outer surface of the tube body 1, located between the two sets of arc-shaped collars. The damage prevention component is used to prevent friction damage when the centralizer travels through the well wall.

[0053] Specifically, the straightener is formed by two first connecting parts 2 and two second connecting parts 3 forming an arc-shaped collar. In the specific implementation, the two corresponding connecting parts at the top and bottom can be the first connecting parts 2, and the two corresponding connecting parts on the left and right can be the second connecting parts 3. Each of the left and right ends of the first connecting parts 2 is fixedly connected to a rack 4. The four racks 4 at the front and rear ends of the two first connecting parts 2 are inserted into grooves 18 opened on the adjacent second connecting parts 3. Each groove 18 has two sets of tensioning components located near the top and bottom of the groove 18, namely two sets of connecting shafts 7 and stop blocks 6 located near the top and bottom of the groove 18. When the racks 4 are inserted from the top and bottom of the groove 18, the racks 4, due to their own locking characteristics, continuously push open the stop blocks 6 inside the groove 18, causing the stop blocks 6 to drive the connecting shafts 7 to rotate. Due to the torque of the torsion springs 9 installed in the connecting shafts 7 and the inner wall of the groove 18, after the force pushing open the stop blocks 6 disappears, the stop blocks 6, along with... When the connecting shaft 7 rotates back to its original position, and the rack 4 is pulled back, its locking teeth will jam the stop block 6, preventing it from being pulled out. This design allows the two first connecting parts 2 of the centralizer's collar to be connected by inserting the racks 4 on both sides into the grooves 18 on both sides of the two second connecting parts 3. The size of the collar formed by the three parts is determined by how much the racks 4 are inserted into the grooves 18. As the racks 4 are continuously inserted into the grooves 18, the opening of the centralizer continuously shrinks. When it is necessary to enlarge the opening of the centralizer... By moving the connecting block 8 on the right side of the second connecting plate 14, the connecting shaft 7 and the stop block 6 are rotated, thereby releasing the engagement of the rack 4 and allowing the rack 4 to be pulled out of the groove 18. After adjustment, the connecting block 8 is released, and the connecting block 8, connecting shaft 7 and stop block 6 return to their original positions under the action of the torsion spring 9. This allows for adjustment of the size of the front and rear rings of the stabilizer to adapt to different testing instruments, solving the problem that the stabilizer size is fixed and cannot be flexibly adjusted, and cannot be adapted to different sizes of tubes.

[0054] Reference Figure 3 The first rollers 5, which are adjacent to each other, both extend through and to the outer surface of the first connector 2 on opposite sides, and the outer surface of the first roller 5 is in close contact with the outer surface of the tube 1.

[0055] Specifically, by providing a first roller 5 on the side where the first connector 2 meets the tube body 1, the friction between the collar part and the tube body 1 can be reduced by the rolling of the first roller 5 when the collar part is put into the tube body 1.

[0056] Reference Figure 4 The material of the rack 4 can preferably be a copper alloy, and the copper alloy rack 4 can be bent.

[0057] Specifically, the copper alloy has good elasticity and bending properties, and the rack 4 bends according to the adjustment arc when adjusting the size of the stabilizer.

[0058] Reference Figure 2 and Figure 4 The rack 4 is slidably connected to the second connecting member 3, and the toothed part on the rack 4 is engaged with the stop block 6.

[0059] Specifically, the size of the front and rear rings of the straightener is adjusted by pulling the rack 4 out of the groove 18 of the second connector 3 and inserting it in, and by adjusting the rack 4 after the interlocking of the toothed part and the stop block 6.

[0060] Reference Figure 4 The stop block 6 is located in the groove 18. The front and rear ends of the two adjacent torsion springs 9 are fixedly connected to the front side of the inner wall of the groove 18. The front right side of the connecting shaft 7 passes through and extends to the right side of the second connecting member 3. The connecting block 8 is located on the right side of the second connecting member 3.

[0061] Specifically, the stop block 6 is fixed at a certain angle in the groove 18 by the connecting shaft 7 and the torsion spring 9. When the rack 4 enters, the stop block 6 is pushed open. When the rack 4 is pulled out, the stop block 6 maintains a specific angle under the tension of the torsion spring 9, thereby holding the rack 4 in place. When disassembling, the engagement with the rack 4 is released by turning the connecting block 8.

[0062] Reference Figure 5 , Figure 6 and Figure 7 The damage prevention component includes four arc-shaped plates 10, which are arranged opposite to each other. They can be divided into a group of two arc-shaped plates 10 facing each other vertically and a group of two arc-shaped plates 10 facing each other horizontally. The two arc-shaped plates 10 are hinged to the first connecting member 2 on both sides. The two arc-shaped plates 10 are hinged to the second connecting member 3 on both sides. The two adjacent first connecting members 2 and the two adjacent second connecting members 3 are fixedly connected to the opposite side of the first connecting member 2. The two adjacent first connecting members 13 are slidably connected to the second connecting member 14. Two springs 12 are fixedly connected between the arc-shaped plate 10 and the adjacent second connecting member 14. The outer surface of the arc-shaped plate 10 is rotatably connected to the evenly distributed second rollers 11.

[0063] Specifically, by providing a second roller 11 on the outer surface of the arc-shaped plate 10, friction is reduced when the centralizer moves within the well wall. When the centralizer encounters a protrusion or a narrowing section within the well wall, it is compressed and contracts inward. As the arc-shaped plate 10 deforms under compression, the hinge between the arc-shaped plate 10 and the first connecting member 2 and the second connecting member 3 ensures that even as the arc-shaped plate 10 is gradually flattened and the angle between it and the first connecting member 2 and the second connecting member 3 changes, the connection remains intact and no damage occurs. Furthermore, the arc-shaped plate 10 deforms... During the process, the first connecting plate 13 and the second connecting plate 14 are stretched and deformed due to the pulling at both ends. This causes the two first connecting plates 13 to be stretched from the center of the outer surface of the second connecting plate 14 to both sides, maintaining the connection between the left and right sides of the device. The force is reduced by the spring 12. After passing the protrusion, the arc plate 10 returns to its original state due to its own inertia and the spring 12. The two first connecting plates 13 also slide back to the center of the second connecting plate 14, and the entire centralizer returns to its original state. This solves the problem of friction damage that easily occurs when the centralizer travels through the well wall.

[0064] Reference Figure 8 The outer surface of the pipe body 1 is provided with a limiting component consisting of two sets of clamps 15 evenly distributed. A nut 17 is provided on the front side of the front clamp set 15, and a bolt 16 is provided on the rear side of the rear clamp set 15.

[0065] Specifically, by setting clamps 15 on both sides of the stabilizer, the position of the stabilizer is fixed within the specified range.

[0066] Reference Figure 8 The front side of bolt 16 passes through clamp 15, and bolt 16 and nut 17 are fastened by threaded connection.

[0067] Specifically, the clamp 15 is fixed to the pipe body 1 by bolts 16 and nuts 17.

[0068] Working principle: When adjusting the stabilizer, the device is placed on the outer surface of the tube body 1. By pushing the second connecting piece 3, the rack 4 pushes open the stop block 6, so that the rack 4 enters the groove 18 in the second connecting piece 3. The stop block 6 is fixed at a certain angle in the groove 18 by the connecting shaft 7 and the torsion spring 9. When the rack 4 enters, the stop block 6 is pushed open. After adjusting to the appropriate size, if you want to pull the rack 4 out of the groove 18, the stop block 6 will lock the rack 4 under the action of the connecting shaft 7 and the torsion spring 9 to prevent the device from loosening. By setting clamps 15 on both sides of the stabilizer, the position of the stabilizer is fixed within the specified range.

[0069] After the stabilizer is installed, the pipe body 1 and the stabilizer enter the well wall together. By setting a second roller 11 on the outer surface of the arc plate 10, the friction of the stabilizer is reduced when it moves in the well wall. When the stabilizer encounters a protrusion or a narrow section in the well wall, the stabilizer is squeezed and shrinks inward. When the arc plate 10 is deformed by the compression, it slides between the first connecting plate 13 and the second connecting plate 14 and the spring 12 reduces the force. After passing the protrusion, the arc plate 10 springs back to its original shape.

[0070] The above content is only for illustrating the technical concept of this utility model and should not be construed as limiting the scope of protection of this utility model. Any modifications made to the technical solution based on the technical concept proposed in this utility model shall fall within the scope of protection of the claims of this utility model.

Claims

1. A centralizer for a cement quality detector, the centralizer comprising: It includes two sets of arc-shaped collars and a tightening component; the arc-shaped collar includes several first connectors (2) and second connectors (3) that are inserted end to end; the first connectors (2) are fixedly provided with racks (4) at both ends, and the second connectors (3) have grooves (18) through them, the racks (4) are inserted into the grooves (18) of the adjacent second connectors (3), and the tightening component is provided inside the grooves (18); the tightening component includes a stop block (6), a connecting shaft (7), a connecting block (8) and a torsion spring (9); the connecting shaft (7) passes through the stop block (6) and is fixedly connected to the stop block (6); the two torsion springs (9) are on the left and right ends of the connecting shaft (7), and the inner and outer ends of the torsion springs (9) are fixedly connected to the outer wall of the connecting shaft (7) and the inner wall of the groove (18) respectively; one end of the connecting shaft (7) passes through and extends to the outside of one side of the second connector (3), and the connecting block (8) is fixed to the end of the connecting shaft (7) on that side.

2. The centralizer of a cement job quality detector according to claim 1, characterized in that, Each set of two sets of first connectors (2) in each set of arc rings has a first roller (5) at the middle position of the side of the tube body (1) that contacts the tube body (1). A part of the first roller (5) extends to the outside of the surface of the first connector (2) and fits tightly against the outer surface of the tube body (1).

3. The centralizer for a cement bond quality tool of claim 1, wherein, It also includes a damage prevention component disposed between two sets of arc-shaped collars. The damage prevention component includes four arc-shaped plates (10) and four sets of sliding buffer components disposed inside the four arc-shaped plates (10). The four arc-shaped plates (10) are arranged in a ring around the outside of the tube body (1) in pairs.

4. The centralizer of a cement bond quality tool according to claim 3, wherein, The two sides of a pair of opposite arc plates (10) are respectively hinged to the first connecting piece (2) provided in the two sets of arc rings, and the two sides of another pair of opposite arc plates (10) are respectively hinged to the second connecting piece (3) provided in the two sets of arc rings.

5. The centralizer of a cement job quality detector according to claim 3, characterized in that, The sliding buffer component includes a spring (12), two first connecting plates (13), and a second connecting plate (14). The two first connecting plates (13) are fixedly connected to the opposite first connecting piece (2) or second connecting piece (3) in the two sets of arc rings respectively, and the second connecting plate (14) is slidably disposed between the two first connecting plates (13); the upper and lower ends of the spring (12) are fixedly connected to the arc plate (10) and the second connecting plate (14) located below the arc plate (10) respectively.

6. The centralizer of a cement job quality detector according to claim 5, characterized in that, The upper surface of the first connecting plate (13) is provided with a track that cooperates with the protrusion on the lower surface of the second connecting plate (14).

7. The centralizer of a cement job quality detector according to claim 3, characterized in that, Several evenly arranged second rollers (11) are provided through the arc plate (10).

8. The centralizer of a cement job quality detector according to claim 1, characterized in that, Each side of the straightener is provided with a limiting component, which consists of two sets of clamps (15) that hug each other.

9. The centralizer of a cement job quality detector according to claim 8, characterized in that, One set of clamps (15) has bolts (16) fixed at both ends, and another set of clamps (15) has bolt holes through both ends; the bolts (16) on one set of clamps (15) pass through the bolt holes on the other set of clamps (15) and are fixed by nuts (17).

10. The centralizer of a cement job quality detector according to claim 1, characterized in that, The rack (4) is made of copper alloy.

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