A kind of anti-caving anti-whirl drilling centralizer fixing mechanism

Abstract

The utility model relates to the technical field of petroleum and natural gas drilling tools, disclose a kind of anti-sloughing anti-vortex drilling centralizer fixing mechanism, including pipe body, pipe body outer wall is equipped with the ball element of slot installation, and pipe body is equipped with quick release mechanism, quick release mechanism includes clamping piece, clamping block, stand and spring, clamping piece is inserted in slot and limits ball element, limit slot is equipped in pipe body, stand is slidably connected in it, end fixed clamping block is used to engage clamping piece, spring is contained in limit slot and abuts stand, using reaction force drives clamping block reset locking, in addition, pipe body is also equipped with fastening assembly. The utility model is driven clamping block by spring cooperation stand, realize the compaction of clamping piece, without integral disassembly, can quickly replace wear ball element, simultaneously, fitting block can self-adaptingly adhere drill pipe surface, solve the problem of fixed loosening caused by drill pipe wear, significantly improve the connection stability of field maintenance efficiency and downhole operation.

Description

Technical Field

[0001] This utility model relates to the field of oil and gas drilling tools, and in particular to a fixing mechanism for an anti-collapse and anti-vortex drilling stabilizer. Background Technology

[0002] In oil and gas drilling, the drill string, when advanced at high speed within the wellbore, is highly susceptible to complex vortex phenomena caused by centrifugal force and axial pressure. This vortex not only exacerbates fatigue damage to the drill string threads, leading to drill string failure, but also, through severe impacts, disrupts the mud cake layer on the wellbore, causing wellbore instability and collapse. Therefore, centralizers are widely used in engineering to keep the drill string centered. Centralizers with ball bearing structures, which utilize rolling friction instead of traditional sliding friction, significantly reduce rotational torque and axial resistance, offering significant advantages in preventing collapse and vortexing.

[0003] However, the downhole working environment is extremely harsh, filled with highly abrasive rock cuttings and mud, accompanied by continuous high-frequency vibrations and impacts. As the core functional component that directly contacts the wellbore, the ball bearings are the fastest-wearing and most easily damaged parts in the entire mechanism. Once the ball bearings wear out beyond the limit or become stuck, the centralizer will lose its drag-reducing and anti-collapse functions, requiring timely replacement and maintenance to ensure the safety of subsequent drilling.

[0004] Existing drilling centralizers often suffer from significant drawbacks in the design of their ball bearing fixing structures, resulting in poor maintenance convenience. Most mainstream products on the market currently employ either integral press-fit installation or deep-buried fixing via complex countersunk bolt assemblies. When worn balls need to be replaced on-site, operators typically need to completely remove the entire centralizer from the drill pipe and perform a cumbersome disassembly process using specialized large tools. This design not only consumes a significant amount of downtime, increasing drilling operating costs, but also, in the harsh environment and confined space of well sites, the complex disassembly and assembly process easily leads to the loss of parts or downhole accidents due to improper installation. Furthermore, existing fixing mechanisms, while locking the balls, often fail to adapt to the wear conditions of the drill pipe surface, resulting in a substantial decrease in the overall connection stability after long-term use.

[0005] Therefore, this utility model proposes a fixing mechanism for an anti-collapse and anti-vortex drilling stabilizer to address the shortcomings of the prior art. Utility Model Content

[0006] To overcome the above deficiencies, this utility model provides a drilling stabilizer fixing mechanism to prevent collapse and eddy current, aiming to improve the problem that some existing drilling stabilizers, after the wear of the ball bearings, have unreasonable fixing structure designs that lead to cumbersome and time-consuming disassembly and replacement processes and low on-site maintenance efficiency.

[0007] This utility model provides a fixing mechanism for an anti-collapse and anti-vortex drilling stabilizer, comprising: a pipe body, a slot provided on the outer wall of the pipe body, a ball bearing installed in the slot, and a quick-release mechanism disposed on the pipe body.

[0008] The quick-release mechanism has a linkage locking structure that enables rapid locking and releasing of the ball bearing component. The quick-release mechanism includes a locking component, a locking block, a column, and a spring.

[0009] Furthermore, fixed blocks are fixedly connected to both sides of the ball bearing, and the fixed blocks are confined within the slot. The locking piece is inserted into the slot. A limiting groove is formed inside the tube. The column is slidably connected within the limiting groove. The end of the column extending out of the tube is fixedly connected to the locking block. The bottom surface of the locking block abuts against and engages with the top surface of the locking piece. The spring is housed within the limiting groove and abuts against the column. The spring is used to generate a reaction force when the locking block is released to drive the locking block to reset and engage the locking piece.

[0010] Preferably, the quick-release mechanism further includes a threaded component, wherein the locking component and the tube body have a threaded groove, and the threaded component is threaded into the threaded groove. The auxiliary fixing of the threaded component further enhances the stability of the locking component in the slot and prevents accidental dislodgement.

[0011] Preferably, the column has a T-shaped cross-section, and the inner wall shape of the limiting groove is adapted to the outer surface shape of the column. This irregular cross-section effectively restricts the rotation of the column and prevents the locking block from exceeding the preset displacement during movement, thus ensuring the stability of the mechanism.

[0012] Preferably, the tube body is further provided with a fastening assembly, which includes a wedge block and a screw. The fastening assembly is used to assist in the connection between the tube body and the drill pipe, providing additional locking force and adaptive fitting capability.

[0013] Preferably, the inner wall of the tube is provided with a curved groove along the circumference, and the outer side of the mating block is slidably connected to the curved groove. The mating block can move along the trajectory of the curved groove, thereby adjusting its position and angle relative to the drill pipe surface.

[0014] Preferably, a circular groove is formed on the side wall of the tube body, the circular groove is connected to the outside of the tube body and the curved groove, the circular groove allows the screw to rotate into it, providing a spatial channel for the operation of the screw.

[0015] Preferably, the mating block has a set groove, the screw passes through the circular groove and is threadedly connected to the set groove, and the screw is used to push the mating block to slide in the curved groove. This structural design allows the mating block to be displaced while the screw is tightened.

[0016] Preferably, the screw is used to connect or tighten with the drill rod thread, and to tightly fit the mating block against the surface of the drill rod. This adaptive fitting method effectively increases the contact area and friction, and solves the problem of unstable fixing caused by uneven drill rod surface.

[0017] This utility model has the following beneficial effects: 1. This utility model, by setting up a quick-release mechanism, uses a spring-driven locking block in conjunction with a T-shaped column to press and lock the locking parts, and supplements it with threaded parts for secondary fixation. This solves the problems of cumbersome replacement process, low maintenance efficiency and easy risk of downhole detachment of ball parts in existing drilling centralizers after wear. It achieves the effect of quick replacement of ball parts without disassembling the entire equipment. At the same time, the double locking structure of spring self-locking and threaded fixation ensures extremely high reliability of connection during downhole operations.

[0018] 2. This utility model solves the problem in the prior art where the surface of the drill rod is worn uneven due to long-term use, resulting in a small contact area and easy loosening of the traditional fixing method. By setting a fastening component, the screw pushes the wedge block to slide in the curved groove on the inner wall of the tube. This achieves the effect of the wedge block being able to adaptively fine-tune its fit according to the surface condition of the drill rod, significantly increasing the contact area and friction, and ensuring the stability of the connection between the tube and the drill rod under severe vibration and impact.

[0019] 3. This utility model solves the problem of rotational deviation or accidental disengagement that is prone to occur during the movement of traditional sliding locking mechanisms by adopting a T-shaped cross-section structure design for the column and the limiting groove. It achieves the effect of strictly limiting the movement trajectory of the locking block, preventing it from exceeding the preset displacement, and enhancing the overall torsional resistance of the structure, thereby further improving the operational stability and service life of the mechanism under harsh working conditions. Attached Figure Description

[0020] Figure 1 This is a three-dimensional schematic diagram of a drilling stabilizer fixing mechanism for preventing collapse and vortexing proposed in this utility model; Figure 2 This is a schematic diagram of the clamping component of the anti-collapse and anti-vortex drilling centralizer fixing mechanism proposed in this utility model; Figure 3 for Figure 2 Enlarged view of point A in the middle; Figure 4This is a schematic diagram of the structure of the locking block of the anti-collapse and anti-vortex drilling stabilizer fixing mechanism proposed in this utility model; Figure 5 This is a schematic diagram of the slot structure of the anti-collapse and anti-vortex drilling centralizer fixing mechanism proposed in this utility model; Figure 6 for Figure 5 Enlarged view of point B in the middle.

[0021] Legend: 1. Tube body; 2. Screw; 3. Ball bearings; 4. Quick-release mechanism; 41. Clip; 42. Threaded groove; 43. Threaded component; 44. Slot; 45. Fixing block; 46. Clip; 47. Column; 48. Spring; 49. Limiting groove; 5. Fastening assembly; 51. Fitting block; 52. Curved groove; 53. Set groove; 54. Circular groove. Detailed Implementation

[0022] The technical solutions of the present utility model 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 utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model. Example

[0023] Reference Figures 1 to 6 This utility model provides a drilling stabilizer fixing mechanism to prevent collapse and eddy current. It aims to solve the problems in the prior art where the replacement process of the ball bearings of the drilling stabilizer is cumbersome after wear, and the problem that the inner wall cannot fit tightly against the drill rod due to uneven wear on the drill rod surface when fixing the pipe body and the drill rod, thus affecting the fixing stability.

[0024] like Figure 1 and Figure 2 As shown, the device includes a pipe body 1, and ball bearings 3, quick-release mechanism 4, and fastening assembly 5 installed on the pipe body 1. The pipe body 1 serves as the supporting frame and mounting base of the entire mechanism. The pipe body 1 is used to fit onto the outer wall of the external drill pipe to achieve the straightening function. The outer wall of the pipe body 1 has a slot 44 opened along the axial direction. The slot 44 is used to provide installation space for the ball bearings 3. The ball bearings 3 are slidably installed inside the slot 44. The ball bearings 3 are used to contact the well wall during drilling to play the role of preventing collapse and resisting vortex.

[0025] like Figure 1As shown, a screw 2 is provided on the tube body 1. The screw 2 is used to lock and fix the tube body 1 to the drill rod in conjunction with the fastening component 5. A quick-release mechanism 4 is provided on the side wall of the tube body 1. The quick-release mechanism 4 is used to limit and lock the ball component 3 and to quickly disassemble it. The quick-release mechanism 4 can be used to quickly replace the worn ball component 3 without damaging the overall structure. The tube body 1 is also provided with a fastening component 5. The fastening component 5 is used to enhance the connection tightness between the tube body 1 and the drill rod. The fastening component 5 can adapt to the wear condition of the drill rod surface and achieve adaptive fitting and fixation. It also includes the quick-release mechanism 4. Furthermore, the quick-release mechanism 4 forms a specific structural cooperation and connection relationship with the aforementioned tube body 1 and ball component 3.

[0026] Reference Figure 2 and Figure 3 The quick-release mechanism 4 includes a locking element 41, a locking block 46, a column 47, a spring 48, a threaded element 43, and a threaded groove 42. A limiting groove 49 is opened inside the tube body 1, and the limiting groove 49 is connected to the outside of the tube body 1. The column 47 is slidably connected in the limiting groove 49. The cross-section of the column 47 is T-shaped. The shape of the limiting groove 49 is adapted to the column 47. The T-shaped cross-section design effectively restricts the rotation of the column 47 and prevents the locking block 46 from exceeding the preset displacement. The up and down sliding of the column 47 in the limiting groove 49 provides a displacement path for the locking block 46.

[0027] A locking block 46 is fixedly connected to one end of the column 47 that extends outside the tube body 1. The locking block 46 is located above the locking piece 41. The locking block 46 is used to engage the top of the locking piece 41 when resetting downwards to prevent the locking piece 41 from coming out of the slot 44. The spring 48 is housed in the limiting groove 49. One end of the spring 48 abuts against the bottom of the limiting groove 49, and the other end of the spring 48 abuts against the end of the column 47 located in the limiting groove 49. The spring 48 is used to generate a reaction force after being compressed. The reaction force can drive the column 47 to move the locking block 46 to automatically reset downwards to its original position when the locking block 46 is released, so that the locking block 46 firmly engages the locking piece 41 and realizes the locking function.

[0028] The clip 41 is inserted into the slot 44. The side wall of the clip 41 near the ball bearing 3 abuts against the side wall of the ball bearing 3. The clip 41 is used to fill the installation gap in the slot 44 and to laterally limit the ball bearing 3. The side of the clip 41 away from the ball bearing 3 and the side wall of the tube body 1 are provided with a threaded groove 42. The threaded part 43 is threaded into the threaded groove 42. The threaded part 43 is used to further lock the clip 41 onto the tube body 1. Through the cooperation of the threaded part 43 and the threaded groove 42, not only is the fixed connection between the clip 41 and the tube body 1 achieved, but the constraint on the clip 41 can also be released by unscrewing the threaded part 43, which is convenient for subsequent disassembly.

[0029] Fixed blocks 45 are fixedly connected to both sides of the ball bearing 3. The fixed blocks 45 are slidably connected in the slot 44. The fixed blocks 45 are used to cooperate with the side wall of the slot 44 to axially limit the ball bearing 3. When the ball bearing 3 needs to be replaced, first remove the threaded part 43 from the threaded groove 42, and then pull the locking block 46 upward. The locking block 46 drives the column 47 to slide upward in the limiting groove 49 and compress the spring 48, releasing the locking restriction on the locking part 41. At this time, the locking part 41 is taken out of the slot 44. Since the ball bearing 3 is restricted in the slot 44 by the fixed blocks 45 on both sides, after the locking part 41 is removed, there is enough space in the slot 44, so the ball bearing 3 can be taken out and replaced. After the replacement is completed, the locking block 46 is released. Under the action of the restoring force of the spring 48, the locking block 46 resets and locks the new locking part 41. With the cooperation of the quick release mechanism 4, the ball bearing 3 can be quickly replaced when worn, which greatly improves the maintenance efficiency.

[0030] Reference Figure 4 and Figure 6 The tube body 1 is also provided with a fastening component 5, which includes a wedge block 51 and a screw 2. A curved groove 52 is opened on the inner wall of the tube body 1. The wedge block 51 is slidably connected in the curved groove 52. The surface shape of the side of the wedge block 51 facing away from the drill rod is in contact with the inner wall shape of the curved groove 52. Through the sliding cooperation between the curved groove 52 and the wedge block 51, the wedge block 51 can be finely adjusted according to the condition of the drill rod surface to adapt to the wear or unevenness of the drill rod surface caused by long-term use.

[0031] Reference Figure 6 A circular groove 54 is provided on the side wall of the pipe body 1, which connects to the outside of the pipe body 1 and the curved groove 52. A set groove 53 is provided on the mating block 51. The screw 2 is used to pass through the circular groove 54 and be threaded into the set groove 53. The screw 2 is not only used to connect with the mating block 51 to push the mating block 51 to slide in the curved groove 52, but also to finally press against the outer wall of the drill pipe or fix it to the drill pipe by means of threaded connection, thereby firmly pressing the mating block 51 against the surface of the drill pipe, increasing the contact area and friction, and ensuring the stability of the pipe body 1 in drilling operations.

[0032] Reference Figure 1 Multiple screws 2 are evenly arranged in the circumferential direction of the tube body 1, and each screw 2 is correspondingly equipped with a fitting block 51 and a curved groove 52. Through multi-point uniform force application and adaptive fitting, the loosening or relative slippage between the tube body 1 and the drill rod is avoided to the greatest extent.

[0033] The working principle of this utility model is as follows: When it is necessary to install and fix the drill rod, first put the tube body 1 on the outer wall of the drill rod, and then rotate the screw 2 set on the tube body 1. During the rotation, the screw 2 gradually enters the circular groove 54 on the tube body 1. When the end of the screw 2 is screwed into the locking groove 53 on the wedge block 51, the screw 2 pushes the wedge block 51 to slide in the curved groove 52.

[0034] During the sliding process, the inner surface of the mating block 51 will adaptively adjust and fit according to the actual situation of the drill rod surface. At this time, continue to tighten the screw 2, and the screw 2 and the mating block 51 will be firmly connected. Finally, it will be fixed to the drill rod by tightening or threaded connection. Under the locking force provided by the screw 2, the mating block 51 is firmly attached to the surface of the drill rod. Through the adaptive adjustment of the fastening component 5, even if the surface of the drill rod becomes uneven due to wear and tear from long-term use, the inner wall of the tube body 1 can still achieve a tight fit through the mating block 51, thereby increasing the fixing effect between the tube body 1 and the drill rod and avoiding loosening due to poor contact.

[0035] When the ball bearing 3 wears out and needs to be replaced during drilling, first unscrew the threaded part 43 from the threaded groove 42 that is opened together by the pipe body 1 and the clamp 41, and release the threaded connection between the clamp 41 and the pipe body 1. Then pull the clamp block 46 upward, and the clamp block 46 drives the column 47 that is fixedly connected to it to slide upward in the limiting groove 49 opened in the pipe body 1.

[0036] As the column 47 slides upward, the spring 48 at the bottom of the column 47 is compressed, and at the same time, the locking block 46 moves upward to release the locking restriction on the locking piece 41. At this time, the locking piece 41 is removed from the slot 44 on the tube body 1. Since the ball ball 3 is restricted in the slot 44 by the fixing blocks 45 on both sides, the opening of the slot 44 increases after the locking piece 41 is removed, so the worn ball ball 3 can be removed and a new ball ball 3 can be replaced.

[0037] After replacement, release the locking block 46, and the spring 48 releases the reaction force generated when compressed, driving the column 47 and locking block 46 to return to their original positions, so that the locking block 46 firmly locks the top of the locking piece 41 again. Through the above actions of the quick-release mechanism 4, the ball ball 3 can be quickly replaced, improving work efficiency.

Claims

1. A drilling stabilizer fixing mechanism for preventing collapse and vortex, comprising a pipe body (1), wherein a slot (44) is provided on the outer wall of the pipe body (1), and a ball bearing (3) is installed in the slot (44). Its features are, It also includes a quick-release mechanism (4), which is installed on the tube body (1); The quick-release mechanism (4) includes a clip (41), a clip (46), a column (47), and a spring (48); The ball bearing (3) is fixedly connected to two sides by fixing blocks (45), which are confined within the slot (44); The card (41) is inserted into the slot (44); A limiting groove (49) is opened inside the tube body (1), and the column (47) is slidably connected in the limiting groove (49). A locking block (46) is fixedly connected to one end of the column (47) that extends out of the tube body (1). The locking block (46) is used to engage the locking piece (41). The spring (48) is housed in the limiting groove (49). The spring (48) abuts against the column (47). The spring (48) is used to generate a reaction force when the locking block (46) is released to drive the locking block (46) to reset so as to engage the locking piece (41).

2. The anti-collapse and anti-vortex drilling stabilizer fixing mechanism according to claim 1, characterized in that, The quick-release mechanism (4) also includes a threaded part (43), and the clamp (41) and the tube body (1) are provided with a threaded groove (42). The threaded part (43) is threadedly connected to the threaded groove (42).

3. The anti-collapse and anti-vortex drilling centralizer fixing mechanism according to claim 1, characterized in that, The cross-section of the column (47) is T-shaped, and the shape of the limiting groove (49) is adapted to the column (47) to prevent the block (46) from exceeding the preset displacement.

4. The anti-collapse and anti-vortex drilling centralizer fixing mechanism according to claim 1, characterized in that, The tube body (1) is provided with a fastening assembly (5), which includes a mating block (51) and a screw (2).

5. The anti-collapse and anti-vortex drilling centralizer fixing mechanism according to claim 4, characterized in that, The inner wall of the tube (1) is provided with a curved groove (52), and the fitting block (51) is slidably connected in the curved groove (52).

6. The anti-collapse and anti-vortex drilling centralizer fixing mechanism according to claim 5, characterized in that, A circular groove (54) is provided on the tube body (1), and the circular groove (54) allows the screw (2) to rotate into it.

7. The anti-collapse and anti-vortex drilling centralizer fixing mechanism according to claim 6, characterized in that, The mating block (51) has a set groove (53) inside. The screw (2) passes through the round groove (54) and is threadedly connected to the set groove (53). The screw (2) is used to push the mating block (51) to slide in the curved groove (52).

8. The anti-collapse and anti-vortex drilling centralizer fixing mechanism according to claim 7, characterized in that, The screw (2) is used to connect to the drill rod thread and to fit the mating block (51) against the surface of the drill rod.

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