Low-resistance rigid casing centralizer

Abstract

The utility model belongs to the technical field of casing centralizers, and particularly relates to a low-resistance rigid casing centralizer which comprises a centralizer body, the centralizer body comprises a pipe body, a centralizing assembly with buffering and damping effects is arranged on the outer side of the pipe body, a low-resistance screw-in part is arranged below the pipe body, and a low-resistance screw-in part is arranged below the low-resistance screw-in part. An auxiliary screwing-out part is arranged on the upper portion of the pipe body, the righting assembly comprises a sleeve with the cross section in a concave shape, the portions, located on the two sides of the sleeve, of the outer side of the pipe body are sleeved with damping springs, righting strips in a bolt shape are arranged on the outer side of the sleeve, and rolling wheels are arranged on the outer sides of the righting strips. A flow guide groove is formed in the portion, between every two adjacent rolling wheels, of the centralizing strip, dredging grooves matched with the centralizing strip are formed in the two sides of the centralizing strip, and a flow dividing set is arranged between every two adjacent centralizing strips. The utility model has the advantages of reasonable design, simple structure and convenience in processing, has the functions of shock absorption and buffering, reduces the impact, prevents the workpiece from being damaged, improves the working progress and meets the use requirements.

Description

Technical Field

[0001] The utility model belongs to the technical field of casing centralizers, in particular to a low-resistance rigid casing centralizer. Background Art

[0002] The casing centralizer is a cementing tool. It is simple to manufacture, beautiful in structure, strong and durable, and has a strong centralizing force. It overcomes the shortcoming of the original welded centralizer that is prone to desoldering. It is a centralizer that can ensure the quality of drilling and cementing.

[0003] The commonly used casing centralizers include elastic centralizers and rigid centralizers. There are generally two types of rigid casing centralizers. One is a centralizer with a straight strip structure on the outer wall, which is widely used in casing construction operations in vertical wells or highly deviated wells. It has the characteristics of small starting force and large reset force. The other is a centralizer with a spiral structure on the outer wall, which is used to center the casing during the completion construction of highly deviated wells and horizontal wells, and can effectively reduce the friction resistance when running the casing.

[0004] At present, the outer wall of the centralizer is a straight strip structure, that is, the straight straightening edges are vertically distributed along the circumference of the casing body. Its disadvantage is that when the well diameter is irregular, the resistance encountered during the casing lowering process is relatively large. A through groove is usually set on the outside to reduce the contact area between the outer edge and the well wall to achieve the purpose of reducing friction. However, in actual use, on the one hand, the establishment of a single vertical groove will affect the discharge of other materials such as cement slurry, causing it to be retained and affecting the work progress. On the other hand, due to the uncertainty of the situation during the movement of the centralizer, damage will inevitably occur during the process of its own rigid movement, such as the impact of cement slurry, etc., and severe damage will also be caused to the casing. Not only can the use requirements not be guaranteed, but also some uncertain processing factors will be brought to the construction, making it difficult to meet the use requirements. Utility Model Content

[0005] In response to the technical problems existing in the use of the above-mentioned rigid casing centralizer, the utility model proposes a low-resistance rigid casing centralizer with reasonable design, simple structure, easy processing, and good shock absorption and buffering effect of the equipment, thereby reducing impact and reducing the possibility of damage to the workpiece, and diverting and guiding the medium during the travel process, thereby ensuring the travel progress, improving the work progress, and meeting the use requirements.

[0006] In order to achieve the above-mentioned purpose, the technical solution adopted by the present invention is a low-resistance rigid casing centralizer, comprising a centralizer body, the centralizer body comprising a tube body, a centralizer assembly with a buffering and shock-absorbing effect is arranged on the outside of the tube body, a low-resistance screw-in portion is arranged below the tube body, an auxiliary screw-out portion is arranged above the tube body, the centralizer assembly comprises a sleeve with a concave cross-section, shock-absorbing springs are sleeved on the outside of the tube body on both sides of the sleeve, a centralizer bar with a bolt-shaped design is arranged on the outside of the sleeve, a roller is arranged on the outside of the centralizer bar, a guide groove is opened on the centralizer bar between two adjacent rollers, a drainage groove adapted to it is opened on both sides of the centralizer bar, and a diversion group is arranged between two adjacent centralizer bars.

[0007] Preferably, the diversion group includes an epitaxial plate with a spiral design, and diversion strips are provided at the corners on both sides of the epitaxial plate. The cross section of the diversion strip is designed in a U shape and is gradually set up in a closing shape from bottom to top.

[0008] Preferably, the low-resistance screw-in portion includes a connecting tube connected to the tube body, a ball is provided in the connecting tube, and a threaded tube is provided below the connecting tube.

[0009] Preferably, the auxiliary screw-out portion includes a mounting tube, and a hemispherical protrusion is provided on the outer side of the mounting tube and is arranged in an interlaced manner with the setting position of the ball.

[0010] Compared with the prior art, the advantages and positive effects of the present invention are:

[0011] 1. The utility model provides a low-resistance rigid casing centralizer, which utilizes the low-resistance screw-in part and the auxiliary screw-out part to promote the travel process of the centralizer body, especially the leading component can clean the travel path and reduce travel obstacles, and the rear component can assist in exporting materials such as cement slurry, which promotes the entry of subsequent casing workpieces and improves the work progress; the telescopic and adjustable centralizing component is utilized to enable the centralizer body to have a good shock-absorbing and buffering effect during the travel process, reduce the possibility of damage, ensure the quality of the workpiece, and meet the use requirements; the device is reasonably designed, simple in structure, and easy to process, and can enable the equipment to have a good shock-absorbing and buffering effect, reduce impact, reduce the possibility of damage to the workpiece, and divert and guide the medium in the travel process, ensure the travel process, improve the work process, and meet the use requirements. BRIEF DESCRIPTION OF THE DRAWINGS

[0012] In order to more clearly illustrate the technical solutions of the embodiments of the present invention, a brief introduction will be given below to the drawings required for use in the description of the embodiments. Obviously, the drawings described below are some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative labor.

[0013] Figure 1 This is a structural diagram of a low-resistance rigid casing centralizer;

[0014] Figure 2 This is a structural front view of a low-resistance rigid casing centralizer;

[0015] Figure 3 A structural diagram of a low-resistance rigid casing centralizer from another perspective;

[0016] Figure 4 It is a schematic diagram of the structure of a low-resistance rigid casing centralizer from a bottom view;

[0017] In the above figures, 1. tube body; 2. sleeve; 3. low-resistance screw-in part; 31. connecting tube; 32. ball; 4. auxiliary screw-out part; 41. mounting tube; 42. protrusion; 5. shock-absorbing spring; 6. straightening strip; 61. guide groove; 62. drainage groove; 7. roller; 8. extension plate; 81. diverter strip; 9. threaded tube. DETAILED DESCRIPTION

[0018] In order to more clearly understand the above-mentioned purpose, features and advantages of the present invention, the present invention is further described below with reference to the accompanying drawings and embodiments. It should be noted that the embodiments of the present application and the features therein can be combined with each other without conflict.

[0019] In the following description, many specific details are set forth to facilitate a full understanding of the present invention. However, the present invention may also be implemented in other ways than those described herein. Therefore, the present invention is not limited to the specific embodiments disclosed in the following specification.

[0020] Examples, such as Figures 1 to 4As shown, a low-resistance rigid casing centralizer includes a centralizer body, which is sleeved on the outside of the casing in the prior art, and is used to provide a stable limit during the conveying process in the previous processing conditions to prevent it from deflecting; further speaking: the centralizer body includes a pipe body 1, a centralizer component with a buffering and shock-absorbing effect is provided on the outside of the pipe body 1, a low-resistance screw-in part 3 is provided below the pipe body 1, and an auxiliary screw-out part 4 is provided above the pipe body 1. The low-resistance screw-in part 3 and the auxiliary screw-out part 4 are used to promote the travel process of the centralizer body, especially the first component can clean the travel path and reduce the travel resistance Obstacles, the subsequent components can assist in the export of materials such as cement slurry, promote the entry of subsequent casing workpieces, and improve the working process; in order to effectively improve the rationality of the device, the straightening component includes a sleeve 2 with a concave cross-section design, and a shock-absorbing spring 5 is sleeved on the outside of the tube body 1 on both sides of the sleeve 2. A straightening bar 6 with a bolt-shaped design is provided on the outside of the sleeve 2, and a roller 7 is provided on the outside of the straightening bar 6. The roller 7 is matched with the straightening bar 6. During the movement of the straightening device body, the roller 7 can be used to increase the smoothness of the movement of the straightening device body to reduce its movement. The friction in the process is improved, and the working process is specifically described as follows: during the movement of the centralizer body, the straightening component will, under the action of the shock-absorbing spring 5, play a buffering role on its position. Especially during the input process of the centralizer body, when it is subjected to impact, its shock-absorbing and buffering effect will play a certain protective role for the device and reduce the possibility of damage. Furthermore, in order to reduce the resistance of the centralizer body during the movement, a guide groove 61 is provided on the straightening bar 6 between the two adjacent rollers 7. The guide groove 61 can cooperate with the straightening bar 6. On the one hand, the straightening bar 6 can reduce its friction during operation. Friction force, on the other hand, cement slurry can flow in the guide groove 61 to prevent excessive blockage of cement slurry, thereby reducing the resistance when the casing centralizer body moves. The two sides of the centralizing bar 6 are provided with a drainage groove 62 adapted thereto. This design can play a drainage role in the process of the centralizer body moving, further playing a role in reducing resistance. A diversion group is provided between two adjacent centralizing bars 6. The establishment of the diversion group can divert and guide the obstacles encountered during the movement of the centralizer body, reduce the pressure during the movement of the centralizer body, and thus reduce the difficulty of running the pipe string to a certain extent and improve the construction efficiency.

[0021] In the above process: the low-resistance screw-in part 3 and the auxiliary screw-out part 4 are utilized to promote the movement of the centralizer body, especially the leading component can clean the movement path and reduce the movement obstacles, and the trailing component can assist in the extraction of materials such as cement slurry, thereby promoting the entry of subsequent casing workpieces and improving the work progress; the telescopically adjustable centralizing component is utilized to enable the centralizer body to have a good shock-absorbing and buffering effect during the movement, reduce the possibility of damage, ensure the quality of the workpiece, and meet the use requirements; the device is reasonably designed, simple in structure, and easy to process, and can enable the equipment to have a good shock-absorbing and buffering effect, reduce impact, reduce the possibility of damage to the workpiece, and divert and guide the medium in the movement process, ensure the movement progress, improve the work progress, and meet the use requirements.

[0022] In order to further improve the rationality of the establishment of the device and equipment, reduce the resistance during its movement, and ensure the progress of the movement, the diversion group includes an extension plate 8 with a spiral design, and diversion strips 81 are provided at the corners on both sides of the extension plate 8. The cross-section of the diversion strip 81 is designed in a U shape, and is gradually established from bottom to top in a closing shape. For the established diversion strip 81, its lower part is designed in a U shape, and as it rotates upward, the external size gradually decreases, that is to say: the shape of the diversion strip 81 itself is gradually twisted from bottom to top, and it is also adapted to the shape of the extension plate 8 and spiral. The purpose of this design is: the lower diversion strip 81 is large in size and high in strength, and the materials in the working conditions it passes through can be diverted. As the stabilizer body moves, gradually approaching the tail end, the diverted materials gradually tend to close and are discharged outward together, which not only reduces the possibility of damage to the equipment, but also provides convenient conditions for the discharge of materials such as cement slurry, and has strong functionality.

[0023] In order to improve the smoothness of the movement of the device and reduce resistance, the low-resistance screw-in part 3 includes a connecting tube 31 connected to the tube body 1. A ball 32 is provided in the connecting tube 31. A threaded tube 9 is provided below the connecting tube 31. The threaded tube 9 can expand the movement path of the centralizer body and allow some soil or cement slurry to be discharged along the thread. With the help of the ball 32 provided on the connecting tube 31, it can promote the movement of the centralizer body, ensure smoothness, improve the working process, and also promote the subsequent diversion group to divert obstacles.

[0024] In order to ensure that the centralizer body can move from the previous mining location to a deeper working condition during its movement, especially to ensure that the centralizer body can conveniently enter the construction environment, the auxiliary swing-out part 4 includes a mounting tube 41. A hemispherical protrusion 42 is provided on the outer side of the mounting tube 41, and is staggered with the position of the ball 32. The auxiliary swing-out part 4 not only plays a role in friction protection, but also plays an auxiliary flow-spreading role at the rear end of the working environment through which the centralizer body passes, thereby preventing cement slurry and the like from hindering the input of subsequent casing and pipe fittings, improving the working process, ensuring smoothness, and meeting the use requirements.

[0025] The above description is only a preferred embodiment of the present invention and does not limit the present invention in any other form. Any technician familiar with the profession may use the technical content disclosed above to change or modify it into an equivalent embodiment with equivalent changes for application in other fields. However, any simple modification, equivalent change and modification of the above embodiment made according to the technical essence of the present invention without departing from the content of the technical solution of the present invention shall still fall within the scope of protection of the technical solution of the present invention.

Claims

1. A low-resistance rigid casing centralizer, comprising a centralizer body, wherein the centralizer body comprises a pipe body, characterized in that: A straightening assembly with a buffering and shock-absorbing effect is provided on the outside of the tube body, a low-resistance screw-in portion is provided below the tube body, and an auxiliary screw-out portion is provided above the tube body. The straightening assembly includes a sleeve with a concave cross-section, and shock-absorbing springs are sleeved on the outside of the tube body on both sides of the sleeve. A straightening bar with a bolt-shaped design is provided on the outside of the sleeve, and a roller is provided on the outside of the straightening bar. A guide groove is provided on the straightening bar located between two adjacent rollers, and drainage grooves adapted thereto are provided on both sides of the straightening bar, and a diversion group is provided between two adjacent straightening bars.

2. A low resistance rigid casing centralizer according to claim 1, characterized in that: The diversion group includes an epitaxial plate with a spiral design. Diversion strips are provided at the corners of both sides of the epitaxial plate. The cross section of the diversion strip is designed in a U shape and is gradually set up in a closing shape from bottom to top.

3. A low resistance rigid casing centralizer according to claim 2, characterized in that: The low-resistance screw-in portion includes a connecting tube connected to the tube body, a ball is arranged in the connecting tube, and a threaded tube is arranged below the connecting tube.

4. A low resistance rigid casing centralizer according to claim 3, characterized in that: The auxiliary screw-out portion includes a mounting tube, and a hemispherical protrusion is provided on the outer side of the mounting tube and is arranged in an interlaced manner with the setting position of the ball.

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