Casing centralizer with resistance reducing function

Abstract

The utility model relates to the technical field of well cementation tools, in particular to a casing centralizer with a resistance reducing function, which comprises a centralizer body, a plurality of spring pieces are uniformly mounted on the outer wall of the centralizer body along the circumference of the centralizer body, a plurality of mounting grooves are formed in the outer wall of each spring piece, rollers are mounted in the mounting grooves, and the rollers are mounted on the periphery of the centralizer body. A plurality of clamping mechanisms used for clamping the casing pipe are installed on the centralizer body, a plurality of adjusting mechanisms used for adjusting the bending degree of the spring piece are further installed on the centralizer body, the bending degree of the spring piece can be conveniently adjusted, and therefore the device can be suitable for oil wells with different calibers.

Description

Technical Field

[0001] The utility model relates to the technical field of cementing tools, in particular to a casing centralizer with a resistance reduction function. Background Art

[0002] A casing centralizer is a tool used in oil and gas drilling. Its main function is to maintain the verticality of the casing when it is lowered into the well, to ensure that the casing can smoothly pass through the wellhead and the formation and eventually reach the predetermined target depth. Currently, a casing centralizer with a resistance reduction function is usually used when the casing is lowered into the well to reduce the resistance of the casing when it is lowered into the well and ensure that the casing is smoothly lowered into the well.

[0003] In the prior art, a casing centralizer with a resistance reduction function is disclosed in a Chinese utility model patent with publication number CN219754486U. By cooperating with an inclined slider 1 and an inclined slider 2, the distance between the arc plate and the inner wall of the centralizer body can be adjusted, so as to adapt to casings of different diameters. By fixing the inclined slider 1, the arc plate can be limited and fixed, so as to fix and clamp the casing. However, it is difficult to adjust the bending degree of the spring sheet when the device is in use, so that it is difficult to be suitable for oil wells of different diameters. The casing may be deflected or stuck during the process of entering the well, affecting the smooth progress of the drilling operation, and thus requiring frequent replacement of equipment, prolonging the time of the entire drilling process, and further increasing the cost.

[0004] Based on the above problems, the utility model provides a casing centralizer with a resistance reduction function. The device is convenient for adjusting the bending degree of the spring sheet and can be applicable to oil wells of different calibers. Summary of the invention

[0005] The technical problem to be solved by the utility model is to design a casing centralizer with a resistance reduction function. The device is convenient for adjusting the bending degree of a spring sheet and can be suitable for oil wells with different calibers.

[0006] In order to solve the above technical problems, the utility model of a casing centralizer with a resistance reduction function includes a centralizer body, and a plurality of spring sheets are evenly installed along the circumference of the outer wall of the centralizer body, and a plurality of mounting grooves are opened on the outer wall of each spring sheet, and rollers are installed inside the plurality of mounting grooves. Its structural feature is that a plurality of clamping mechanisms for clamping casing are installed on the centralizer body, and a plurality of adjustment mechanisms for adjusting the bending degree of the spring sheets are also installed on the centralizer body.

[0007] By adopting the above structure, the friction between the spring sheet and the well wall is reduced by setting multiple rollers, thereby reducing resistance; by adjusting the bending degree of the spring sheet by the adjusting mechanism, the casing centralizer can adapt to oil wells of different diameters, thereby increasing the flexibility of the device.

[0008] Preferably, the adjustment mechanism comprises a rotating rod rotatably mounted on the centralizer body and arranged vertically, the lower section of the rotating rod is a threaded section, and the upper section is a control section without threads, the centralizer body is also provided with a plurality of first grooves, the threaded section of the rotating rod is arranged in the first grooves, the upper end of the spring sheet is threadedly connected to the threaded section of the rotating rod, and the upper part of the rotating rod is connected to a limiting mechanism for limiting the rotation of the rotating rod. By rotating the rotating rod, the spring sheet can be bent to a required size, thereby adapting to oil wells of different calibers.

[0009] Preferably, the limiting mechanism comprises a support rod fixed to the top of the centralizer body and a limiting plate sleeved outside the support rod, a tooth block is installed on the limiting plate, a gear meshing with the tooth block on the limiting plate is sleeved on the control section of the rotating rod, a first spring is sleeved on the outer sleeve of the support rod, the upper end of the first spring is connected to the bottom of the limiting plate, and the lower end is connected to the top of the centralizer body. The rotation of the rotating rod can be controlled by the tooth block on the limiting plate and the gear sleeved on the outer sleeve of the rotating rod.

[0010] Preferably, the upper end of the spring sheet is connected to a connecting block, the connecting block is fixedly connected to a moving block on one side close to the rotating rod, the moving block is threadedly connected to the threaded section of the rotating rod, the first groove is provided with first slide grooves on both sides along the axis direction of the centralizer body, and first sliders adapted to the first slide grooves are fixedly installed on both sides of the moving block, and the two first sliders can slide up and down in the two first slide grooves. The two first sliders slide up and down in the two first slide grooves, thereby driving the spring sheet connected by the moving block to bend, making the whole process more stable.

[0011] Preferably, the control section of the rotating rod extends upward to the top of the centralizer body, the gear sleeve is arranged outside the control section of the rotating rod, and a knob is installed on the upper end of the control section, and the rotation of the rotating rod is controlled by the control knob.

[0012] Preferably, two positioning rods are fixedly mounted on the support rod, and two positioning grooves adapted to the two positioning rods are provided inside the limiting plate, and the two positioning rods can slide up and down in the two positioning grooves. The sliding cooperation between the two positioning rods and the two positioning grooves makes the limiting plate move up and down more smoothly and stably.

[0013] Preferably, the clamping mechanism comprises an arc-shaped plate arranged inside the centralizer body and a mounting block mounted outside the arc-shaped plate, a screw is rotatably mounted on the mounting block, a second slide slot is correspondingly provided on the centralizer body, the screw passes through the second slide slot and extends outward from the second slide slot, and a rotating disk is mounted on one end of the screw away from the arc-shaped plate. Through the mutual cooperation between the screw and the arc-shaped plate, the device can be applied to casings of different radius sizes, thereby increasing adjustability.

[0014] Preferably, two horizontal movable rods are fixedly mounted on the outer side wall of the arc-shaped plate, and the two movable rods are respectively arranged on the upper and lower sides of the mounting block, and two movable grooves adapted to the two movable rods are provided on the centralizer body, and the two movable rods can slide in the two movable grooves. Through the sliding cooperation between the two movable rods and the two movable grooves, the movement of the arc-shaped plate is smoother and more stable.

[0015] Preferably, the centralizer body is provided with a plurality of reinforcing mechanisms for reinforcing the spring sheet, the reinforcing mechanisms include a plurality of second grooves provided on the centralizer body, the plurality of second grooves correspond to the positions of the plurality of spring sheets respectively, a vertically arranged fixing rod is fixedly installed in the second groove, a second slider is slidably mounted on the fixing rod, a reinforcing rod is fixedly installed inside the spring sheet, and a second spring is arranged between the reinforcing rod and the second slider. By setting the reinforcing mechanism, the spring sheet can be reinforced to avoid the situation that the spring sheet deviates when it contacts the well wall after bending.

[0016] Preferably, a moving rod is connected between the reinforcement rod and the second slider, a slot is provided in the reinforcement rod, the inner diameter of the slot is larger than the diameter of the moving rod, one end of the second spring is connected to the moving rod, and the other end is connected to the slot. The setting of the slot facilitates the storage of the moving rod and saves space.

[0017] In summary, the beneficial effects of the present invention are:

[0018] (1) By setting the adjustment mechanism, the bending degree of the spring sheet can be adjusted, so that it can be applied to oil fields of different diameters, so that the casing will not easily deflect or get stuck during the process of entering the well, ensuring the smooth progress of the drilling operation, solving the problem of frequent equipment replacement in the existing device, prolonging the time of the entire drilling process, and further reducing the cost;

[0019] (2) By setting up the reinforcement mechanism, the spring sheet can be reinforced to prevent it from deflecting when it collides with the well wall after bending, thereby increasing the utilization efficiency of the casing centralizer, improving the overall stability and flexibility, reducing the risk of spring sheet breakage, and extending the service life of the casing centralizer. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] The utility model is further described in detail below with reference to the accompanying drawings and specific embodiments:

[0021] Figure 1 This is a schematic diagram of the overall structure of a casing centralizer with a resistance reduction function according to the utility model;

[0022] Figure 2 It is a structural schematic diagram of the installation relationship between the clamping mechanism and the centralizer body of the utility model;

[0023] Figure 3 It is a structural schematic diagram of the installation relationship between the adjustment mechanism and the centralizer body of the utility model;

[0024] Figure 4 for Figure 3 A schematic diagram of the enlarged structure of the middle part A;

[0025] Figure 5 It is a structural schematic diagram of the support rod and the limiting plate in the limiting mechanism of the utility model;

[0026] Figure 6 It is a structural schematic diagram of the reinforcement mechanism of the utility model when it is disassembled.

[0027] In the figure: 1. stabilizer body; 2. spring sheet; 3. mounting groove; 4. roller; 5. first groove; 6. rotating rod; 61. threaded section; 62. control section; 7. support rod; 8. limit plate; 9. gear; 10. first spring; 11. connecting block; 12. moving block; 13. first slider; 14. first slide groove; 16. knob; 17. positioning rod; 18. positioning groove; 19. arc plate; 20. mounting block; 21. screw rod; 22. rotating disk; 23. movable rod; 24. movable groove; 25. second groove; 26. fixed rod; 27. second slider; 28. reinforcement rod; 29. ​​second spring; 30. moving rod; 31. slot. DETAILED DESCRIPTION

[0028] The following is a further detailed description of the specific implementation of the present invention in conjunction with the accompanying drawings and examples. The following examples are used to illustrate the present invention, but are not intended to limit the scope of the present invention.

[0029] In the description of the present application, it should be understood that the terms "center", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", etc., indicating orientations or positional relationships, are based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation on the present application.

[0030] The terms "first", "second", etc. are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Thus, a feature defined as "first", "second", etc. may explicitly or implicitly include one or more of the feature. In the description of this application, unless otherwise specified, "plurality" means two or more.

[0031] In the description of this application, it should be noted that, unless otherwise clearly specified and limited, the terms "installed", "connected", and "connected" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be indirectly connected through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in this application can be understood according to specific circumstances.

[0032] The following is a description of preferred embodiments of the present invention in conjunction with the accompanying drawings.

[0033] See attached Figure 1 The utility model discloses a casing centralizer with a resistance reduction function, the device comprises a centralizer body 1, a plurality of spring sheets 2 are evenly installed along the circumference of the outer wall of the centralizer body 1, a plurality of mounting grooves 3 are opened on the outer wall of each spring sheet 2, a plurality of mounting grooves are internally installed with rollers 4, a plurality of clamping mechanisms for clamping the casing are installed on the centralizer body 1, and a plurality of adjusting mechanisms for adjusting the bending degree of the spring sheet 2 are also installed on the centralizer body 1, such as Figure 2 As shown, the clamping mechanism includes an arc-shaped plate 19 arranged inside the centralizer body 1 and a mounting block 20 installed on the outside of the arc-shaped plate 19. The outside here refers to the side close to the spring sheet 2, but is still located inside the centralizer body 1. A screw 21 is rotatably mounted on the mounting block 20. A second slide groove is correspondingly provided on the centralizer body 1. The screw 21 passes through the second slide groove and extends outward from the second slide groove. A rotating disk 22 is installed at one end of the screw 21 away from the arc-shaped plate 19. Two horizontally arranged movable rods 23 are fixedly installed on the outer wall of the arc-shaped plate 19. The two movable rods 23 are respectively arranged on the upper and lower sides of the mounting block 20. Two movable grooves 24 adapted to the two movable rods 23 are provided on the centralizer body 1. The two movable rods 23 can slide in the two movable grooves 24.

[0034] When in use, first rotate the rotating disk 22 to drive the screw 21 to rotate, and the rotation of the screw 21 drives the mounting block 20 to move, and the movement of the mounting block 20 drives the arc plate 19 to move synchronously. The movement of the arc plate 19 makes the space inside the centralizer body 1 larger, and then the casing to be put into the well is placed in the centralizer body 1, and the rotating disk 22 is rotated in the opposite direction to drive the screw 21 to rotate, so that the arc plate 19 is reset, so that the casing can be clamped, thereby preventing the casing from falling off during the well entry process. When the centralizer body 1 moves down in the well, the friction between the spring sheet 2 and the well wall is reduced by the arrangement of multiple rollers 4, thereby reducing resistance. The mutual cooperation between the screw 21 and the arc plate 19 makes the device suitable for casings of different radii, increasing adjustability, and the sliding cooperation between the two movable rods 23 and the two movable grooves 24 makes the movement of the arc plate 19 smoother and more stable.

[0035] As a further explanation of this embodiment, refer to the attached Figure 3 The adjusting mechanism comprises a rotating rod 6 which is rotatably mounted on the centralizer body 1 and vertically arranged. The lower section of the rotating rod 6 is a threaded section 61, and the upper section is a control section 62 without a thread. The centralizer body 1 is also provided with a plurality of first grooves 5. The threaded section 61 of the rotating rod 6 is arranged in the first groove 5. The upper end of the spring sheet 2 is threadedly connected to the threaded section 61 of the rotating rod 6. The upper part of the rotating rod 6 is connected with a limiting mechanism for limiting the rotation of the rotating rod 6, such as Figure 4 and Figure 5 As shown, the limiting mechanism includes a support rod 7 fixed to the top of the centralizer body 1 and a limiting plate 8 sleeved outside the support rod 7, a tooth block is installed on the limiting plate 8, a gear 9 meshing with the tooth block on the limiting plate 8 is sleeved on the control section 62 of the rotating rod 6, and a first spring 10 is sleeved on the outer sleeve of the support rod 7, the upper end of the first spring 10 is connected to the bottom of the limiting plate 8, and the lower end is connected to the top of the centralizer body 1, as shown in FIG. Figure 3 As shown, the upper end of the spring sheet 2 is connected to a connecting block 11, and a moving block 12 is fixedly connected to the side of the connecting block 11 close to the rotating rod 6. The moving block 12 is threadedly connected to the threaded section 61 of the rotating rod 6. First slide grooves 14 are provided on both sides of the first groove 5 along the axial direction of the centralizer body 1. First sliders 13 adapted to the first slide grooves 14 are fixedly installed on both sides of the moving block 12. The two first sliders 13 can slide up and down in the two first slide grooves 14. The control section 62 of the rotating rod 6 extends upward to the top of the centralizer body 1. The gear 9 is sleeved outside the control section 62 of the rotating rod 6. The upper end of the control section 62 is installed with a knob 16, as shown in FIG. Figure 5 As shown, two positioning rods 17 are fixedly mounted on the support rod 7 , and two positioning grooves 18 matching the two positioning rods 17 are provided inside the limiting plate 8 , and the two positioning rods 17 can slide up and down in the two positioning grooves 18 .

[0036] When in use, first observe the size of the wellhead, press the limit plate 8 to make it move downward relative to the support rod 7, the limit plate 8 moves downward to compress the first spring 10, and by compressing the first spring 10, the limit plate 8 and the gear 9 are separated from each other, and then the knob 16 is turned to drive the rotating rod 6 to rotate, and the rotating rod 6 is rotated to make the moving block 12 move on the rotating rod 6, and the two first sliding blocks 13 and the two first sliding grooves 14 cooperate with each other to make the moving block 12 move up and down in the first groove 5, and the movement of the moving block 12 drives the connecting block 11 to move, and through the connecting The movement of block 11 causes the spring sheet 2 to bend until it bends to the required size, then the knob 16 can be stopped, and then the limit plate 8 is released. The elastic force of the first spring 10 resets it, and the reset of the limit plate 8 causes it to mesh with the gear 9, thereby forming a limiting effect on the rotating rod 6. Through the sliding cooperation of the two positioning rods 17 and the two positioning grooves 18, the limit plate 8 can move up and down more smoothly and stably. By adjusting the bending degree of the spring sheet 2, the casing centralizer can adapt to oil wells of different calibers, thereby increasing the flexibility of the device.

[0037] As a further explanation of this embodiment, refer to the attached Figure 3 and attached Figure 6 A plurality of reinforcing mechanisms for reinforcing the spring sheet 2 are installed on the centralizer body 1. The reinforcing mechanisms include a plurality of second grooves 25 provided on the centralizer body 1. The plurality of second grooves 25 correspond to the positions of the plurality of spring sheets 2 one by one. A vertically arranged fixing rod 26 is fixedly installed in the second groove 25. A second slider 27 is slidably mounted on the fixing rod 26. A reinforcing rod 28 is fixedly installed on the inner side of the spring sheet 2. A second spring 29 is arranged between the reinforcing rod 28 and the second slider 27. A moving rod 30 is connected between the reinforcing rod 28 and the second slider 27. Figure 6 As shown, a slot 31 is provided in the reinforcing rod 28 , the inner diameter of the slot 31 is larger than the diameter of the moving rod 30 , and one end of the second spring 29 is connected to the moving rod 30 , and the other end is connected to the slot 31 .

[0038] When in use, the bending of the spring sheet 2 drives the reinforcement rod 28 to move, and the movement of the reinforcement rod 28 drives the movement of the moving rod 30. The movement of the moving rod 30 causes the second slider 27 to slide up and down on the fixed rod 26, avoiding distortion between the reinforcement rod 28 and the moving rod 30, so that the spring sheet 2 will not break easily. When the spring sheet 2 continues to bend and the distance between it and the stabilizer body 1 increases, the elastic force of the second spring 29 drives the moving rod 30 to move, so that the spring sheet 2 can be continuously reinforced.

[0039] The above is only a preferred embodiment of the present invention. It should be pointed out that for ordinary technicians in this technical field, multiple improvements and substitutions can be made without departing from the technical principles of the present invention. These improvements and substitutions should also be regarded as the protection scope of the present invention.

Claims

1. A casing centralizer with a drag reduction function, comprising a centralizer body (1), wherein a plurality of spring sheets (2) are evenly mounted on the outer wall of the centralizer body (1) along its circumference, wherein the outer wall of each spring sheet (2) is provided with a plurality of mounting grooves (3), wherein rollers (4) are mounted inside the plurality of mounting grooves, wherein the plurality of mounting grooves are provided with a plurality of rollers (4), wherein the plurality of rollers (4) are mounted on the outer wall of the centralizer body (1), wherein the plurality of spring sheets (2) are provided with a plurality of mounting grooves, ... The centralizer body (1) is provided with a plurality of clamping mechanisms for clamping the casing, and the centralizer body (1) is also provided with a plurality of adjusting mechanisms for adjusting the bending degree of the spring sheet (2); The adjustment mechanism comprises a rotating rod (6) rotatably mounted on the centralizer body (1) and arranged vertically, the lower section of the rotating rod (6) being a threaded section (61), and the upper section being a non-threaded control section (62), the centralizer body (1) also being provided with a plurality of first grooves (5), the threaded section (61) of the rotating rod (6) being arranged in the first grooves (5), the upper end of the spring sheet (2) being threadedly connected to the threaded section (61) of the rotating rod (6), and the upper part of the rotating rod (6) being connected to a limiting mechanism for limiting the rotation of the rotating rod (6).

2. The casing centralizer with resistance reduction function according to claim 1, characterized in that The limiting mechanism comprises a support rod (7) fixed to the top of the centralizer body (1) and a limiting plate (8) sleeved on the outside of the support rod (7), a tooth block being mounted on the limiting plate (8), a gear (9) being sleeved on the control section (62) of the rotating rod (6) and meshing with the tooth block on the limiting plate (8), and a first spring (10) being sleeved on the outer sleeve of the support rod (7), the upper end of the first spring (10) being connected to the bottom of the limiting plate (8), and the lower end being connected to the top of the centralizer body (1).

3. The casing centralizer with resistance reduction function according to claim 2, characterized in that The upper end of the spring sheet (2) is connected to a connecting block (11), and a moving block (12) is fixedly connected to the side of the connecting block (11) close to the rotating rod (6). The moving block (12) is threadedly connected to the threaded section (61) of the rotating rod (6). First sliding grooves (14) are provided on both sides of the first groove (5) along the axial direction of the centralizer body (1). First sliding blocks (13) adapted to the first sliding grooves (14) are fixedly installed on both sides of the moving block (12), and the two first sliding blocks (13) can slide up and down in the two first sliding grooves (14).

4. The casing centralizer with resistance reduction function according to claim 3, characterized in that The control section (62) of the rotating rod (6) extends upward to the top of the centralizer body (1), the gear (9) is sleeved outside the control section (62) of the rotating rod (6), and a knob (16) is installed on the upper end of the control section (62).

5. The casing centralizer with resistance reduction function according to claim 4, characterized in that Two positioning rods (17) are fixedly mounted on the support rod (7), and two positioning grooves (18) matching the two positioning rods (17) are provided inside the limiting plate (8), and the two positioning rods (17) can slide up and down in the two positioning grooves (18).

6. The casing centralizer with resistance reduction function according to claim 1, characterized in that The clamping mechanism comprises an arc-shaped plate (19) arranged inside the centralizer body (1) and a mounting block (20) mounted outside the arc-shaped plate (19); a screw rod (21) is rotatably mounted on the mounting block (20); a second slide groove is correspondingly provided on the centralizer body (1); the screw rod (21) passes through the second slide groove and extends outward from the second slide groove; a rotating disk (22) is mounted on one end of the screw rod (21) away from the arc-shaped plate (19).

7. The casing centralizer with resistance reduction function according to claim 6, characterized in that Two horizontally arranged movable rods (23) are fixedly mounted on the outer side wall of the arc-shaped plate (19), and the two movable rods (23) are respectively arranged on the upper and lower sides of the mounting block (20). Two movable grooves (24) adapted to the two movable rods (23) are provided on the centralizer body (1), and the two movable rods (23) can slide in the two movable grooves (24).

8. The casing centralizer with resistance reduction function according to claim 1, characterized in that A plurality of reinforcing mechanisms for reinforcing the spring sheet (2) are mounted on the centralizer body (1), the reinforcing mechanisms comprising a plurality of second grooves (25) formed on the centralizer body (1), the plurality of second grooves (25) corresponding to the positions of the plurality of spring sheets (2) one by one, a vertically arranged fixing rod (26) being fixedly mounted in the second groove (25), a second sliding block (27) being slidably mounted on the fixing rod (26), a reinforcing rod (28) being fixedly mounted on the inner side of the spring sheet (2), and a second spring (29) being arranged between the reinforcing rod (28) and the second sliding block (27).

9. The casing centralizer with resistance reduction function according to claim 8, characterized in that A moving rod (30) is connected between the reinforcing rod (28) and the second sliding block (27); a slot (31) is provided in the reinforcing rod (28); the inner diameter of the slot (31) is larger than the diameter of the moving rod (30); one end of the second spring (29) is connected to the moving rod (30) and the other end is connected to the slot (31).

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