Drill rod external thread cleaning device

Abstract

The invention relates to the technical field of petroleum equipment, in particular to a drill rod external thread cleaning device. Comprising a floating centering mechanism, a rotating mechanism, an adjusting assembly and a brush assembly. The rotating mechanism is arranged on the floating centering mechanism, is used for finely adjusting the position of the rotating mechanism and is concentric with the drill rod; the rotating mechanism comprises a lower rotating assembly and an upper rotating assembly, and one end of the brush assembly is rotatably arranged on the upper rotating assembly; a stand column is arranged in the middle of the brush assembly, and one end of the stand column penetrates through the movement track hole of the upper rotating assembly to reach the movement track groove of the lower rotating assembly. The adjusting assembly is arranged above the upper rotating assembly and used for adjusting the clamping degree of the brush. The brush assembly is used for cleaning external threads of the drill rod. The device adopts an integrated design of floating centering, gear transmission and a composite track. The rotating mechanism and the brush assembly are in multi-dimensional linkage, and dirt on all parts of the thread form can be cleaned.

Description

Technical Field

[0001] The present invention relates to the technical field of oilfield equipment, and particularly to a cleaning device for the external threads of drill pipes. Background Art

[0002] In oilfield drilling operations, as the core tool for transmitting power and conveying drilling fluid, drill pipes need to be connected by threads to form a continuous drill string of several kilometers to meet the requirements of deep well drilling. However, during the drilling process in complex formations, the external threads of drill pipes are extremely prone to being covered by cuttings peeled off from the wellbore wall, viscous mud, and corrosive media, forming a dense dirt layer. In traditional operations, operators need to manually clean the thread surface section by section using wire brushes, etc. This not only has a high labor intensity but also low safety. The limitations of the technology conflict with the increasing demand for automated drilling, and there is an urgent need to develop a dedicated intelligent thread cleaning technology. Summary of the Invention

[0003] The present invention provides a cleaning device for the external threads of drill pipes, aiming to quickly clean the external threads of drill pipes.

[0004] To achieve the above object, the technical solution of the present invention is as follows:

[0005] A cleaning device for the external threads of drill pipes includes: a floating centering mechanism, a rotating mechanism, an adjusting component, and a brush component;

[0006] The rotating mechanism is arranged on the floating centering mechanism and is used to finely adjust the position of the rotating mechanism to be concentric with the drill pipe;

[0007] The rotating mechanism includes a lower rotating component and an upper rotating component. One end of the brush component is rotatably arranged on the upper rotating component; a column is arranged in the middle of the brush component, and one end of the column passes through the movement track hole of the upper rotating component and reaches the movement track groove of the lower rotating component;

[0008] The adjusting component is arranged above the upper rotating component and is used to adjust the clamping degree of the brush;

[0009] The brush component is used to clean the external threads of the drill pipe.

[0010] Further, the lower rotating component includes a large gear, a bearing one, a fixing ring one, and a track disk;

[0011] The inner ring of the bearing one is sleeved on the fixing ring one, the inner hole of the large gear is arranged at the lower part of the outer ring of the bearing one, and the inner hole of the track disk is arranged at the upper part of the outer ring of the bearing one;

[0012] A number of movement track grooves are evenly arranged on the track disk;

[0013] The motor drives the small gear to rotate, and the small gear drives the large gear to rotate.

[0014] Further, the upper rotating assembly includes a second fixed ring, a second bearing, a rotating plate and a mounting ring;

[0015] The second fixed ring is arranged above the first fixed ring and is concentric with the first fixed ring;

[0016] The inner ring of the second bearing is sleeved on the second fixed ring. The rotating plate is arranged on the lower half of the outer ring of the second bearing, and the mounting ring is arranged on the upper half of the outer ring of the second bearing. The rotating plate and the mounting ring are fixedly connected;

[0017] The rotating plate is provided with a movement track hole; one ends of a plurality of brush assemblies are arranged on the rotating plate.

[0018] Further, a mounting bracket is arranged on the rotating plate for mounting the brush assembly.

[0019] Further, the adjusting assembly includes a friction ring, an adjusting ring, an adjusting bolt and a spring;

[0020] The friction ring is arranged on the upper part of the second fixed ring. The adjusting ring is pressed on the friction ring. The adjusting bolt passes through the spring and the adjusting ring and is screwed on the mounting ring. By rotating the adjusting bolt to adjust the pre-tightening force of the spring, the friction force between the adjusting ring and the friction ring is adjusted.

[0021] Further, the brush assembly includes a rotating shaft, a column, a swing frame, a brush bracket and a brush;

[0022] The rotating shaft is arranged at one end of the swing frame, the column is arranged in the middle of the swing frame, the brush bracket is arranged at the other end of the swing frame, and the brush is arranged on the brush bracket.

[0023] Further, a first long hole is arranged on the side surface of the brush bracket and is fixed on the swing frame through a bolt passing through the first long hole; a sliding groove is arranged on the main body of the brush bracket for inserting the brush into the bracket; an elastic baffle is arranged on the upper part of the sliding groove for limiting the brush.

[0024] Further, the floating centering mechanism includes a fixed bottom plate, a floating plate, universal balls and tension springs;

[0025] The floating plate is fixedly connected with the lower rotating assembly,

[0026] A plurality of universal balls are arranged on the fixed bottom plate, and the floating plate is pressed on the universal balls;

[0027] One ends of the fixed bottom plate and the floating plate are limited by a limit bolt;

[0028] The fixed bottom plate and the floating plate are floatingly limited by a plurality of tension springs.

[0029] Furthermore, a second long hole is provided on the floating plate, and a through hole is provided on the fixed bottom plate. The limit bolt passes through the second long hole and the through hole for connection, and the nut and the limit bolt do not tightly connect the fixed bottom plate and the floating plate.

[0030] Furthermore, an L-shaped limit plate is provided at the bottom of the floating plate to limit the up and down movement between the fixed bottom plate and the floating plate.

[0031] The beneficial effects achieved by the present invention are as follows:

[0032] A drill pipe external thread cleaning device realizes the full circumferential continuous cleaning of the drill pipe external thread through the linkage design of the gear transmission system and the rotating brush assembly. Through the integrated design of floating centering + gear transmission + composite trajectory, compared with the traditional manual cleaning method section by section, the cleaning efficiency is improved, and it can meet the requirements of automated drilling production line operations. The multi-dimensional linkage of the rotating mechanism and the brush assembly can cover the dirt cleaning of each part of the thread profile.

[0033] A drill pipe external thread cleaning device. The innovative floating centering mechanism automatically compensates for the radial offset of the drill pipe within a certain range through the synergistic effect of the universal ball and the tension spring. The non-tight connection design of the fixed bottom plate and the floating plate, that is, the cooperation of the second long hole and the limit bolt, not only ensures the stability of the device but also can meet the concentric positioning requirements of drill pipes of different specifications, reducing the difficulty of manual centering operation.

[0034] A drill pipe external thread cleaning device adopts a composite adjustment mechanism of spring pre-tightening force + friction ring. The contact pressure between the brush and the thread surface can be controlled by adjusting the bolt. The sliding groove and elastic baffle design of the brush holder can not only quickly replace the worn brush but also compensate for the wear amount of the brush bristles through elastic deformation, ensuring the consistency of the cleaning force and avoiding overwear or incomplete cleaning.

[0035] A drill pipe external thread cleaning device drives the brush assembly to generate a composite movement of circumferential rotation and radial swing simultaneously through the cooperation of the movement trajectory groove of the lower rotating assembly and the trajectory hole of the upper rotating assembly, which can effectively remove the rock debris deposition at the root part that is difficult to reach by traditional linear brushing.

[0036] A drill pipe external thread cleaning device isolates the rotating parts from the operators, reducing the risk of mechanical injury compared with the traditional open wire brush operation. Description of the Drawings

[0037] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the following will briefly introduce the drawings required for the description of the embodiments or the prior art. Obviously, the drawings in the following description are only some embodiments of the present invention. For those of ordinary skill in the art, without creative efforts, other drawings can be obtained based on the structures shown in these drawings.

[0038] Figure 1 It is a three-dimensional structure of a cleaning device for the external thread of a drill pipe Figure 1 ;

[0039] Figure 2 It is a three-dimensional structure of a cleaning device for the external thread of a drill pipe Figure 2 ;

[0040] Figure 3 It is a three-dimensional structure of a cleaning device for the external thread of a drill pipe Figure 3 ;

[0041] Figure 4 It is a cross-sectional view of a cleaning device for the external thread of a drill pipe;

[0042] Figure 5 It is a partial enlarged view of a cleaning device for the external thread of a drill pipe;

[0043] In the figure, 1. Floating centering mechanism; 11. Fixed bottom plate; 12. Floating plate; 13. Universal ball; 14. Tension spring; 15. L-shaped limiting plate; 16. Second long hole; 17. Through hole; 18. Limiting bolt;

[0044] 2. Rotating mechanism; 21. Lower rotating assembly; 211. Large gear; 212. Bearing 1; 213. Fixed ring 1; 214. Trajectory disc; 22. Upper rotating assembly; 221. Fixed ring 2; 222. Bearing 2; 223. Rotating plate; 224. Mounting ring; 225. Mounting bracket;

[0045] 3. Adjusting assembly; 31. Friction ring; 32. Adjusting ring; 33. Adjusting bolt; 34. Spring;

[0046] 4. Brush assembly; 41. Rotating shaft; 42. Column; 43. Swing frame; 44. Brush bracket; 441. First long hole; 442. Sliding groove; 443. Elastic baffle; 45. Brush;

[0047] 51. Small gear; 52. Motor; 53. Drill pipe.

[0048] The realization, functional characteristics and advantages of the object of the present invention will be further described with reference to the embodiments and the accompanying drawings. Detailed implementation manners

[0049] The technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present invention without creative efforts shall fall within the protection scope of the present invention.

[0050] It should be noted that if there are directional indications (such as up, down, left, right, front, back,...) involved in the embodiments of the present invention, the directional indications are only used to explain the relative positional relationship and movement conditions between components in a specific posture (as shown in the accompanying drawings). If the specific posture changes, the directional indications will also change accordingly.

[0051] In addition, if there are descriptions such as "first", "second", etc. involved in the embodiments of the present invention, the descriptions of "first", "second", etc. are only for descriptive purposes and cannot be understood as indicating or implying their relative importance or implicitly indicating the quantity of the indicated technical features. Thus, the features defined with "first" and "second" may explicitly or implicitly include at least one such feature. In addition, the meaning of "and / or" appearing throughout the text is that it includes three parallel solutions. Taking "A and / or B" as an example, it includes solution A, or solution B, or a solution where A and B are satisfied simultaneously. In addition, the technical solutions between various embodiments can be combined with each other, but it must be based on the fact that those of ordinary skill in the art can implement them. When the combination of technical solutions is contradictory or cannot be implemented, it should be considered that such a combination of technical solutions does not exist and is not within the protection scope required by the present invention.

[0052] As Figures 1 to 5 shown, an external thread cleaning device for a drill pipe 53 includes: a floating centering mechanism 1, a rotating mechanism 2, an adjusting component 3, and a brush component 4.

[0053] The rotating mechanism 2 is arranged on the floating centering mechanism 1 and is used to finely adjust the position of the rotating mechanism 2 to be concentric with the drill pipe 53.

[0054] The rotating mechanism 2 includes a lower rotating component 21 and an upper rotating component 22. One end of the brush component 4 is rotatably arranged on the upper rotating component 22; a column 42 is arranged in the middle of the brush component 4, and one end of the column 42 passes through the movement track hole of the upper rotating component 22 to reach the movement track groove of the lower rotating component 21.

[0055] The cooperation between the lower track groove and the upper track hole drives the brush 45 to complete circumferential rotation and radial swing simultaneously. This compound movement can penetrate into the root part of the thread and achieve dirt stripping through mechanical linkage.

[0056] The adjusting assembly 3 is arranged above the upper rotating assembly 22 and is used to adjust the clamping degree of the brush 45; the brush assembly 4 is used to clean the external threads of the drill pipe 53.

[0057] The lower rotating assembly 21 includes a large gear 211, a first bearing 212, a first fixing ring 213, and a track disk 214; the inner ring of the first bearing 212 is sleeved on the first fixing ring 213, the inner hole of the large gear 211 is arranged at the lower part of the outer ring of the first bearing 212, and the inner hole of the track disk 214 is arranged at the upper part of the outer ring of the first bearing 212; a plurality of motion track grooves are uniformly arranged on the track disk 214; the motor 52 drives the small gear 51 to rotate, and the small gear 51 drives the large gear 211 to rotate.

[0058] The lower rotating assembly 21 includes a large gear 211, a track disk 214 and a bearing system. The motor 52 drives the small gear 51 to drive the large gear 211 to rotate, and the motion track grooves on the track disk 214 control the radial swing of the brush assembly 4.

[0059] The upper rotating assembly 22 includes a second fixing ring 221, a second bearing 222, a rotating plate 223 and a mounting ring 224; the second fixing ring 221 is arranged above the first fixing ring 213 and is concentric with the first fixing ring 213; the inner ring of the second bearing 222 is sleeved on the second fixing ring 221, the rotating plate 223 is arranged at the lower half of the outer ring of the second bearing 222, the mounting ring 224 is arranged at the upper half of the outer ring of the second bearing 222, and the rotating plate 223 and the mounting ring 224 are fixedly connected; a motion track hole is arranged on the rotating plate 223; one ends of a plurality of brush assemblies 4 are arranged on the rotating plate 223.

[0060] The upper rotating assembly 22 transfers the circumferential motion of the rotating plate 223 to the brush assembly 4 through the cooperation of the second fixing ring 221 and the second bearing 222, and the mounting ring 224 is connected with the adjusting assembly 3 to realize pressure adjustment.

[0061] A mounting bracket 225 is arranged on the rotating plate 223 for mounting the brush assembly 4. The adjusting assembly 3 includes a friction ring 31, an adjusting ring 32, an adjusting bolt 33 and a spring 34.

[0062] The friction ring 31 is arranged on the upper part of the second fixing ring 221, the adjusting ring 32 is pressed on the friction ring 31, the adjusting bolt 33 passes through the spring 34 and the adjusting ring 32 and is screwed on the mounting ring 224. By rotating the adjusting bolt 33, the pre-tightening force of the spring 34 is adjusted to adjust the friction force between the adjusting ring 32 and the friction ring 31.

[0063] Adopt a composite adjustment mechanism of the pre-tightening force of the spring 34 and the friction ring 31, and control the contact pressure between the brush 45 and the threaded surface by adjusting the bolt 33. The compression amount of the spring 34 determines the clamping force of the brush 45, and the friction force of the friction ring 31 restricts the excessive swing of the brush 45.

[0064] The brush assembly 4 includes a rotating shaft 41, a column 42, a swing frame 43, a brush bracket 44 and a brush; the rotating shaft 41 is arranged at one end of the swing frame 43, the column 42 is arranged in the middle of the swing frame 43, the brush bracket 44 is arranged at the other end of the swing frame 43, and the brush 45 is arranged on the brush bracket 44.

[0065] A first long hole 441 is arranged on the side surface of the brush bracket 44 and is fixed on the swing frame 43 by passing a bolt through the first long hole 441; a sliding groove 442 is arranged on the main body of the brush bracket 44 for inserting the brush 45 into the bracket; an elastic baffle 443 is arranged above the sliding groove 442 for limiting the brush 45.

[0066] The rotating shaft 41 drives the swing frame 43, the column 42 cooperates with the track groove to generate a radial swing, and the brush bracket 44 realizes the quick replacement and wear compensation of the brush 45 through the sliding groove 442 and the elastic baffle 443. The floating centering mechanism 1 includes a fixed bottom plate 11, a floating plate 12, a universal ball 13 and a tension spring 14; the floating plate 12 is fixedly connected with the lower rotating assembly 21, a plurality of universal balls 13 are arranged on the fixed bottom plate 11, and the floating plate 12 presses on the universal balls 13; one ends of the fixed bottom plate 11 and the floating plate 12 are limited by a limit bolt 18 (connecting the fixed plate and the floating plate 12); the fixed bottom plate 11 and the floating plate 12 are floatingly limited by a plurality of tension springs 14.

[0067] A second long hole 16 (on the floating plate 12) is arranged on the floating plate 12, a through hole 17 (on the fixed plate) is arranged on the fixed bottom plate 11, a bolt passes through the second long hole 16 and the through hole 17 for connection, and the nut is not tightened and the bolt does not tightly connect the fixed bottom plate 11 and the floating plate 12. An L-shaped limit plate 15 is arranged at the bottom of the floating plate 12 to limit the up and down movement between the fixed bottom plate 11 and the floating plate 12.

[0068] Through the coordinated action of the universal ball 13 and the tension spring 14, automatic centering of the device and the drill pipe 53 is realized, and the radial offset of the drill pipe 53 is compensated. The fixed bottom plate 11 and the floating plate 12 are connected in a non-fastening manner with long holes and limit bolts 18, allowing the device to be adaptively adjusted within a certain range, reducing the difficulty of manual centering.

[0069] The cleaning principle is as follows: after the device is installed, the floating centering mechanism 1 enables the floating plate 12 to move freely along the fixed base plate 11 through the synergistic effect of the universal ball 13 and the tension spring 14. When the drill rod 53 has radial offset, the floating plate 12 automatically adjusts its position under the elastic constraint of the tension spring 14 to ensure that the rotating mechanism 2 is concentric with the external thread of the drill rod 53. The L-shaped limit plate 15 at the bottom of the floating plate 12 cooperates with the through hole 17 of the fixed base plate 11 to limit the displacement in the up and down directions and avoid dislocation due to vibration. The motor 52 drives the small gear 51 to drive the large gear 211 to rotate, and the large gear 211 transmits power to the track disk 214 through the bearing system. The track groove of the track disk 214 cooperates with the column 42 of the brush assembly 4 to drive the brush 45 to swing radially and penetrate into the thread root. The rotating plate 223 is linked with the column 42 through the motion track hole to drive the brush 45 to rotate circumferentially around the drill rod 53. The composite motion of rotation and swinging covers the entire surface of the thread and peels off stubborn dirt.

[0070] The spring 34 is compressed by rotating the adjusting bolt 33 to change the friction between the adjusting ring 32 and the friction ring 31, thereby controlling the contact pressure of the brush 45 on the thread surface. The smaller the preload force of the spring 34, the easier it is for the brush 45 to be retracted to the middle, and the closer the brush 45 fits the thread.

[0071] The sliding groove 442 and the elastic baffle 443 of the brush holder 44 can be used to quickly replace the brush 45. When the brush 45 needs to be replaced, the elastic baffle 443 can be quickly moved to replace it.

[0072] The combined motion (circumferential rotation + radial swing) of the brush 45 acts directly on the thread root through mechanical linkage, and removes dirt on the external thread with the preset pressure. The floating centering mechanism 1 continuously fine-tunes the position of the device to compensate for the deviation of the drill rod 53 caused by vibration or deformation, ensuring the cleaning stability. After cleaning, the motor 52 stops, the adjustment component 3 releases the pressure, the brush 45 returns to the initial position, and the external thread of the drill rod 53 is sprayed with oil.

[0073] The above descriptions are only optional embodiments of the present invention, and are not intended to limit the patent scope of the present invention. All equivalent structural changes made using the contents of the present invention's specification and drawings, or directly / indirectly applied in other related technical fields, are included in the patent protection scope of the present invention.

Claims

1. A cleaning device for the external threads of drill pipes, characterized in that, Including: A floating centering mechanism (1), a rotating mechanism (2), an adjusting component (3), and a brush component (4); The rotating mechanism (2) is arranged on the floating centering mechanism (1) and is used to finely adjust the position of the rotating mechanism (2) to be concentric with the drill pipe (53); The rotating mechanism (2) includes a lower rotating component (21) and an upper rotating component (22). One end of the brush component (4) is rotatably arranged on the upper rotating component (22); A column (42) is arranged in the middle of the brush component (4), and one end of the column (42) passes through the movement track hole of the upper rotating component (22) and reaches the movement track groove of the lower rotating component (21); The adjusting component (3) is arranged above the upper rotating component (22) and is used to adjust the clamping degree of the brush (45); The brush component (4) is used to clean the external threads of the drill pipe (53).

2. The external thread cleaning device for drill pipes according to claim 1, characterized in that: The lower rotating component (21) includes a large gear (211), a first bearing (212), a first fixing ring (213), and a track disc (214); The inner ring of the first bearing (212) is sleeved on the first fixing ring (213). The inner hole of the large gear (211) is arranged at the lower part of the outer ring of the first bearing (212), and the inner hole of the track disc (214) is arranged at the upper part of the outer ring of the first bearing (212); A number of movement track grooves are evenly arranged on the track disc (214); The motor (52) drives the small gear (51) to rotate, and the small gear (51) drives the large gear (211) to rotate.

3. The external thread cleaning device for drill pipes according to claim 2, characterized in that: The upper rotating component (22) includes a second fixing ring (221), a second bearing (222), a rotating plate (223), and an installation ring (224); The second fixing ring (221) is arranged above the first fixing ring (213) and is concentric with the first fixing ring (213); The inner ring of the second bearing (222) is sleeved on the second fixing ring (221). The rotating plate (223) is arranged at the lower half of the outer ring of the second bearing (222), and the installation ring (224) is arranged at the upper half of the outer ring of the second bearing (222). The rotating plate (223) and the installation ring (224) are fixedly connected; The rotating plate (223) is provided with a movement track hole; One end of a number of brush components (4) is arranged on the rotating plate (223).

4. The external thread cleaning device for drill pipes according to claim 3, characterized in that: An installation bracket (225) is arranged on the rotating plate (223) for installing the brush component (4).

5. The external thread cleaning device for drill pipes according to claim 3, wherein: The adjusting component (3) includes a friction ring (31), an adjusting ring (32), an adjusting bolt (33), and a spring (34); The friction ring (31) is arranged on the upper part of the second fixing ring (221). The adjusting ring (32) is pressed on the friction ring (31). The adjusting bolt (33) passes through the spring (34) and the adjusting ring (32) and is screwed on the installation ring (224). By rotating the adjusting bolt (33) to adjust the pre-tightening force of the spring (34), the friction force between the adjusting ring (32) and the friction ring (31) is adjusted.

6. The external thread cleaning device for drill pipes according to claim 3, characterized in that: The brush component (4) includes a rotating shaft (41), a column (42), a swing bracket (43), a brush bracket (44), and a brush; The rotating shaft (41) is arranged at one end of the swing frame (43), the column (42) is arranged in the middle of the swing frame (43), the brush support (44) is arranged at the other end of the swing frame (43), and the brush (45) is arranged on the brush support (44).

7. The external thread cleaning device for drill pipes according to claim 6, characterized in that: A first long hole (441) is arranged on the side surface of the brush support (44), and it is fixed on the swing frame (43) by bolts passing through the first long hole (441); a sliding groove (442) is arranged on the main body of the brush support (44) for inserting the brush (45) into the support; an elastic baffle (443) is arranged above the sliding groove (442) for limiting the brush (45).

8. The external thread cleaning device for drill pipes according to claim 1, characterized in that: The floating centering mechanism (1) includes a fixed bottom plate (11), a floating plate (12), universal balls (13) and tension springs (14). The floating plate (12) is fixedly connected to the lower rotating assembly (21). A number of universal balls (13) are arranged on the fixed bottom plate (11), and the floating plate (12) presses on the universal balls (13). One end of the fixed bottom plate (11) and the floating plate (12) is limited by a limit bolt (18). The fixed bottom plate (11) and the floating plate (12) are floatingly limited by a number of tension springs (14).

9. The external thread cleaning device for drill pipes according to claim 8, characterized in that: A second long hole (16) is arranged on the floating plate (12), a through hole (17) is arranged on the fixed bottom plate (11), the limit bolt (18) passes through the second long hole (16) and the through hole (17) for connection, and the nut and the limit bolt (18) do not tightly connect the fixed bottom plate (11) and the floating plate (12).

10. A drill pipe external thread cleaning device according to claim 8, characterized in that: An L-shaped limit plate (15) is arranged at the bottom of the floating plate (12) to limit the up and down movement between the fixed bottom plate (11) and the floating plate (12).

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