Brush pipe scraper

Abstract

The utility model discloses a brush pipe scraper which comprises a mandrel, two ends of the mandrel are respectively and fixedly connected with an upper connector and a lower connector, an upper spiral centralizing sleeve and a lower spiral centralizing sleeve are respectively and movably sleeved on the upper portion and the lower portion of the mandrel, a supporting sleeve is respectively arranged inside the upper spiral centralizing sleeve and the lower spiral centralizing sleeve, and the supporting sleeves are sleeved on the mandrel. A plurality of plate spring pieces are connected between the two supporting sleeves, a brush body is fixed to the middle of each plate spring piece, the mandrel is of a step-shaped structure with the two ends large and the middle small, the upper spiral centralizing sleeve and the lower spiral centralizing sleeve are installed at the large-diameter positions of the two ends of the mandrel respectively, and a distance exists between the main body structure of each plate spring piece and the outer wall of the middle of the mandrel. The outer diameter of the upper spiral centralizing sleeve and the outer diameter of the lower spiral centralizing sleeve are larger than the outer diameter of the upper connector and smaller than the outer diameter of the installed brush body. The hairbrush pipe scraper not only is simple in structure, low in manufacturing cost and long in service life, but also effectively solves the anti-blocking problem of the hairbrush pipe scraper and avoids underground accidents.

Description

Technical Field

[0001] The utility model relates to a brush pipe scraper, belonging to the technical field of petroleum well equipment. Background Art

[0002] The brush scraper is a type of casing cleaning scraper widely used in drilling and well repair. Its main function is to clean the inner surface of the oil casing and provide a clean surface for the subsequent cementing and completion. After long-term use, it has been found that existing brush scrapers have complex structures and high rigidity, which can easily cause them to become stuck in casing under harsh working conditions, leading to downhole accidents. Summary of the Invention

[0003] The purpose of the utility model is to provide a brush pipe scraper that is not only simple in structure, low in manufacturing cost, and long in service life, but also effectively solves the anti-stuck problem of the brush pipe scraper, thereby avoiding accidents underground.

[0004] The technical solution of the utility model is as follows: a brush scraper comprises a central shaft, the two ends of the central shaft are fixedly connected to the upper joint and the lower joint respectively, the upper and lower parts of the central shaft are movably sleeved with an upper spiral straightening sleeve and a lower spiral straightening sleeve respectively, a support sleeve is provided inside the upper spiral straightening sleeve and the lower spiral straightening sleeve, the support sleeve is sleeved on the central shaft, a plurality of leaf springs are connected between the two support sleeves, a brush body is fixed in the middle of each leaf spring, the central shaft is a stepped structure with large ends and small middle, the upper spiral straightening sleeve and the lower spiral straightening sleeve are respectively installed at the large diameters at both ends of the central shaft, there is a distance between the main structure of the leaf spring and the outer wall in the middle of the central shaft, the outer diameters of the upper spiral straightening sleeve and the lower spiral straightening sleeve are larger than the upper joint and smaller than the brush body after installation.

[0005] In the aforementioned brush scraper, the central shaft is threadedly connected to the upper joint and the lower joint, and O-rings are provided between the upper and lower parts of the threaded connections between the central shaft and the upper joint, and between the central shaft and the lower joint. The upper joint and the lower joint are also fixedly connected to the central shaft by screws and washers.

[0006] In the aforementioned brush scraper, corresponding semicircular circumferential grooves are provided on the outside of the upper end of the central shaft and the inside of the upper spiral straightening sleeve. A steel ball placement screw hole connected to the semicircular circumferential groove inside the upper spiral straightening sleeve is also provided on the outer circumference of the upper spiral straightening sleeve. The steel ball is placed into the circular circumferential groove formed by the central shaft and the upper spiral straightening sleeve through the steel ball placement screw hole, and is sealed by a sealing plug threadedly connected to the steel ball placement screw hole. The central shaft above and below the steel ball and the upper spiral straightening sleeve are sealed by a star ring, and an upper wear-resistant belt is also provided on the outer circumference of the central shaft blocked by the upper spiral straightening sleeve.

[0007] In the aforementioned brush scraper, corresponding semicircular circumferential grooves are provided on the outside of the lower end of the central shaft and the inside of the lower spiral straightening sleeve. A steel ball placement screw hole connected to the semicircular circumferential groove inside the lower spiral straightening sleeve is also provided on the outer periphery of the lower spiral straightening sleeve. The steel ball is placed into the circular circumferential groove formed by the central shaft and the lower spiral straightening sleeve through the steel ball placement screw hole, and is sealed by a sealing plug threadedly connected to the steel ball placement screw hole. The central shaft above and below the steel ball and the lower spiral straightening sleeve are sealed by a star-shaped ring, and a lower wear-resistant belt is also provided on the outer periphery of the central shaft blocked by the lower spiral straightening sleeve.

[0008] In the aforementioned brush scraper, several spiral grooves are opened on the outer circular surface of the upper spiral straightening sleeve and the lower spiral straightening sleeve, and internal spline grooves are provided inside the upper spiral straightening sleeve and the lower spiral straightening sleeve. The internal spline grooves cooperate with the external splines on the outer wall of the support sleeve, and there is a certain distance between the end faces of the two support sleeves adjacent to the brush body and the step surface of the core shaft.

[0009] In the aforementioned brush scraper, holes are provided at both ends of the leaf spring, and the holes at both ends correspond to the positions of the threaded holes on the two support sleeves respectively. The positioning pin and the positioning ring are connected to the threaded holes on the support sleeves through the holes on the leaf spring.

[0010] In the aforementioned brush scraper, a dovetail structure is provided on the outer surface of the middle part of the leaf spring, which cooperates with the dovetail groove of the brush body. The leaf spring is also provided with multiple holes, each hole corresponding to a waist-shaped hole on the brush body. The fixing pin extends from the hole on the leaf spring to the waist-shaped hole on the brush body, and the back of the fixing pin is locked and fixed by a spiral retaining ring.

[0011] In the aforementioned brush scraper, the brush body consists of a brush body and bristles, adjacent brush bodies are installed alternately up and down on different leaf springs, and the bristles on the surface of the brush body are also arranged alternately, and the end of the brush body without bristles is a slender structure.

[0012] The beneficial effects of the present invention are as follows: compared with the prior art, the brush scraper adopts the above structure, by setting a core shaft with large ends and small middle, and the upper spiral straightening sleeve and the lower spiral straightening sleeve are respectively set at the large diameters at both ends of the core shaft, so that there is a certain gap between the leaf spring connecting the upper spiral straightening sleeve and the lower spiral straightening sleeve and the small diameter of the core shaft, which is convenient for the leaf spring to deform inward. When the brush body encounters resistance in the casing, it can shrink inwardly through the elasticity of the leaf spring, thereby protecting the brush body, thereby extending the service life of the brush body, and at the same time effectively solving the anti-stuck problem of the brush scraper, avoiding the occurrence of underground accidents.

[0013] In general, the utility model can good solve the problem that the existing brush pipe scraper structure is complex, rigid, easy to cause the sleeve to be stuck, and cause the downhole accident. The utility model discloses a brush pipe scraper only simple structure, low manufacturing cost, long service life, and effectively solve the problem of anti-blocking of the brush pipe scraper, avoid the downhole accident. BRIEF DESCRIPTION OF DRAWINGS

[0014] Figure 1 It is the structure schematic diagram of the utility model;

[0015] Figure 2 It is the connecting structure schematic diagram of the upper joint and the mandrel;

[0016] Figure 3 It is the connecting structure schematic diagram of the mandrel and the upper spiral centralizer;

[0017] Figure 4 It is the sectional structure schematic diagram of the utility model; Figure 3

[0018] Figure 5 It is the connecting structure schematic diagram of the leaf spring and the brush body;

[0019] Figure 6 It is the sectional structure schematic diagram of the utility model; Figure 5

[0020] Figure 7 It is the connecting structure schematic diagram of the mandrel and the lower spiral centralizer, lower joint.

[0021] Reference signs: 1-upper joint, 2-mandrel, 3-screw, 4-upper spiral centralizer, 5-upper wear-resistant band, 6-supporting sleeve, 7-positioning pin, 8-positioning ring, 9-leaf spring, 10-brush body, 11-fixing pin, 12-lower spiral centralizer, 13-lower wear-resistant band, 14-spiral check ring, 15-lower joint, 16-O-ring, 17-washer, 18-star ring, 19-sealing plug, 20-steel ball. DETAILED DESCRIPTION

[0022] The utility model will be further described below in connection with the drawings and examples, but not as the basis for limiting the utility model.

[0023] ​​An embodiment of the present utility model is a brush pipe scraper, comprising a mandrel 2, the two ends of which are fixedly connected to an upper joint 1 and a lower joint 15, respectively. An upper spiral straightening sleeve 4 and a lower spiral straightening sleeve 12 are movably sleeved on the upper and lower parts of the mandrel 2, respectively. The upper spiral straightening sleeve 4 and the lower spiral straightening sleeve 12 can achieve flexible circumferential rotation compared to the mandrel 2, but cannot achieve axial displacement. A support sleeve 6 is provided inside each of the upper spiral straightening sleeve 4 and the lower spiral straightening sleeve 12, and the support sleeve 6 is sleeved on the mandrel 2. The support sleeve 6 can rotate with the upper spiral straightening sleeve 4 and the lower spiral straightening sleeve 12, and can also achieve axial displacement. A plurality of leaf springs 9 are fixedly connected between the two support sleeves 6, and a brush body 10 is fixed in the middle of each leaf spring 9. The core shaft 2 is a stepped structure with large ends and a small middle. The upper spiral straightening sleeve 4 and the lower spiral straightening sleeve 12 are respectively installed at the large diameters of the two ends of the core shaft 2. There is a gap between the main structure of the leaf spring 9 and the outer wall of the middle part of the core shaft 2. This gap is the space for the leaf spring 9 to deform. When the brush body 10 encounters resistance in the casing, it can be elastically contracted inward by the leaf spring 9, which can protect the brush body 10, thereby extending the service life of the brush body 10. At the same time, it can also effectively solve the anti-stuck problem of the brush scraper and avoid underground accidents. During the elastic inward contraction of the leaf spring 9, it will drive the support sleeve 6 fixed to it to move axially toward the brush body 10. The outer diameters of the upper spiral straightening sleeve 4 and the lower spiral straightening sleeve 12 are larger than the upper joint 1 and smaller than the brush body 10 after installation, so that it has a straightening effect.

[0024] The spindle 2 is threadedly connected to the upper joint 1 and the lower joint 15 respectively. O-rings 16 are also provided above and below the threaded connections between the spindle 2 and the upper joint 1, and between the spindle 2 and the lower joint 15. The upper joint 1 and the lower joint 15 are also fixedly connected to the spindle 2 by screws 3 and washers 17.

[0025] Corresponding semicircular circumferential grooves are provided on the outside of the upper end of the central shaft 2 and on the inside of the upper spiral straightening sleeve 4. A steel ball placement screw hole connected to the semicircular circumferential groove inside the upper spiral straightening sleeve 4 is also provided on the outer periphery of the upper spiral straightening sleeve 4. The steel ball 20 is placed into the circular circumferential groove formed by the central shaft 2 and the upper spiral straightening sleeve 4 through the steel ball placement screw hole, and is sealed by a sealing plug 19 threadedly connected to the steel ball placement screw hole. The central shaft 2 and the upper spiral straightening sleeve 4 above and below the steel ball 20 are sealed by a star ring 18, and an upper wear-resistant belt 5 is also provided on the outer periphery of the central shaft 2 blocked by the upper spiral straightening sleeve 4.

[0026] The lower end of the mandrel 2 and the inside of the lower spiral centralizer 12 are provided with corresponding semicircular circumferential grooves, and the outer periphery of the lower spiral centralizer 12 is further provided with steel ball placing screw holes in communication with the semicircular circumferential grooves in the inside thereof, the steel balls 20 are placed into the circular circumferential grooves formed by the mandrel 2 and the lower spiral centralizer 12 through the steel ball placing screw holes, and are sealed by the sealing plugs 19 threadedly connected with the steel ball placing screw holes, the mandrel 2 and the lower spiral centralizer 12 above and below the steel balls 20 are sealed by the star-shaped rings 18, and the outer periphery of the mandrel 2 shielded by the lower spiral centralizer 12 is further provided with the lower wear-resistant band 13.

[0027] The outer cylindrical surface of the upper spiral centralizer 4 and the lower spiral centralizer 12 is provided with a plurality of spiral grooves, and the inside of the upper spiral centralizer 4 and the lower spiral centralizer 12 is provided with an internal spline groove matched with the external spline on the outer wall of the support sleeve 6, and the end faces of the two support sleeves 6 adjacent to the brush body 10 are a certain distance away from the stepped surface of the mandrel 2.

[0028] The plate spring 9 is provided with holes at both ends, and the holes at both ends are respectively in position correspondence with the threaded holes on the two support sleeves 6, and the positioning pin 7 and the positioning ring 8 are connected with the threaded holes on the support sleeves 6 through the holes on the plate spring 9.

[0029] The outer surface of the middle part of the plate spring 9 is provided with a dovetail structure matched with the dovetail groove of the brush body 10, and the plate spring 9 is further provided with a plurality of holes, each hole is in position correspondence with a waist-shaped hole on the brush body 10, the fixing pin 11 extends into the waist-shaped hole on the brush body 10 from the hole on the plate spring 9, and the back of the fixing pin 11 is locked and fixed by the spiral check ring 14.

[0030] The brush body 10 is composed of a brush body and brush hairs, adjacent brush bodies 10 are installed on the upper and lower staggered plates 9, and the brush hairs on the surface of the brush body 10 are also staggered, and the end of the brush body 10 without brush hairs is an elongated structure.

[0031] The structures of various components constituting the utility model and their functions are introduced as follows:

[0032] The upper joint 1 has a water eye in it, through which drilling fluid can pass, the upper joint 1 is connected with the upper part of the drilling string system through the upper connecting thread, and is connected with the mandrel 2 through the lower thread. The screw 3 and the washer 17 are connected with the threaded holes on the mandrel 2 through the countersunk holes on the upper joint 1, so that a reinforced connection is formed between the upper joint 1 and the mandrel 2, the thread between the upper joint 1 and the mandrel 2 cannot be backed off, and the O-ring 16 is used for sealing between the upper joint 1 and the mandrel 2, so as to reduce the pressure loss in the water eye and prevent the drilling fluid inside and outside the utility model from entering the inside of the thread and affecting the service life of the thread.

[0033] Spindle 2: Spindle 2 has a water hole inside to allow drilling fluid to pass through. Spindle 2 and upper connector 1 are connected by threads. Screw 3 and washer 17 are connected through the countersunk hole in upper connector 1 and the threaded hole in spindle 2, forming a reinforced connection between upper connector 1 and spindle 2, preventing the threads between upper connector 1 and spindle 2 from backing out. The upper connector 1 and spindle 2 are sealed by O-ring 16, which reduces pressure loss in the water hole and prevents drilling fluid inside and outside the scraper from entering the threads and affecting the thread life.

[0034] There are corresponding semicircular circumferential grooves on the outside of the upper end of the core shaft 2 and the inside of the upper spiral straightening sleeve 4 to form a circular circumferential groove. The connection between the core shaft 2 and the upper spiral straightening sleeve 4 is ensured by a certain number of steel balls 20. The steel balls 20 are installed in the circular circumferential groove, and the sealing plug 19 is connected to the steel ball placement screw hole on the upper spiral straightening sleeve 4 through a thread, thereby blocking and sealing the steel ball placement screw hole of the steel ball 20. The core shaft 2 and the upper spiral straightening sleeve 4 above and below the steel ball 20 are sealed by a star ring 18, thereby reducing the adverse effects of internal and external drilling fluids on the steel ball 20. The upper wear-resistant belt 5 between the core shaft 2 and the upper spiral straightening sleeve 4 can reduce the friction between the core shaft 2 and the upper spiral straightening sleeve 4.

[0035] The connection and sealing between the spindle 2 and the lower spiral centralizing sleeve 12 are the same as those of the upper spiral centralizing sleeve 4, and are also sealed by the star ring 18, and the lower wear-resistant belt 13 reduces friction.

[0036] The spindle 2 is connected to the lower joint 15 through the lower thread, and the screw 3 and the washer 17 are connected to the threaded hole on the spindle 2 through the countersunk hole on the lower joint 15, thereby forming a reinforced connection between the upper joint 1 and the spindle 2, so that the threads between the upper joint 1 and the spindle 2 will not be stripped, and the spindle 2 and the lower joint 15 are sealed by the O-ring 16, thereby reducing the pressure loss in the water eye and preventing the drilling fluid inside and outside the scraper from entering the thread and affecting the thread life.

[0037] Screw 3: Screw 3 is used in conjunction with washer 17 to provide a fixed connection between the upper joint 1 and the spindle 2, and between the lower joint 15 and the spindle 2.

[0038] The upper spiral centralizer 4 has a semicircular circumferential groove inside and a steel ball placement screw hole in the radial direction, which can be connected and sealed with the mandrel 2 through the steel ball 20, the sealing plug 19, the star-shaped ring 18, the upper wear-resistant strip 5, and can keep the upper spiral centralizer 4 flexible in the circumferential direction. The outer diameter of the upper spiral centralizer is greater than the upper connector 1 and smaller than the installed brush body 10, and the outer circular surface of the upper spiral centralizer is provided with several spiral grooves, which can play a centralizing effect on the entire scraping device in the working diameter of the scraping device, thereby ensuring the normal operation of the brush scraping device while reducing the damage to the brush body 10 surface caused by the deflection of the brush scraping device in the casing, thereby prolonging the service life of the brush body 10. The inner spline groove in the upper spiral centralizer 4 is matched with the outer spline of the support sleeve 6, and there is a certain distance between the end face of the support sleeve 6 and the stepped surface of the mandrel 2, so that the support sleeve 6 and the positioning pin 7, the positioning ring 8 and the leaf spring 9 connected therewith can keep consistent with the rotation of the upper spiral centralizer 4 in the circumferential direction and have sufficient limiting in the axial direction.

[0039] The upper wear-resistant strip 5 can reduce the friction between the mandrel 2 and the upper spiral centralizer 4, avoid damage to the mandrel 2 and the upper spiral centralizer 4 caused by friction, and thereby prolong the service life of the scraping device.

[0040] The outer spline of the support sleeve 6 is matched with the two inner spline grooves in the upper spiral centralizer 4 and the lower spiral centralizer 12

[0041] The end face of the support sleeve 6 near the brush body 10 and the stepped surface of the mandrel 2 have a certain distance, so that the support sleeve 6 and the positioning pin 7, the positioning ring 8 and the leaf spring 9 connected therewith can keep consistent with the rotation of the upper spiral centralizer 4 and the lower spiral centralizer 12 in the circumferential direction and have sufficient limiting in the axial direction. The positioning pin 7 and the positioning ring 8 are connected through the hole in the leaf spring 9 and the threaded hole in the support sleeve 6, so that the leaf spring is fixed to the support sleeve 6.

[0042] The positioning pin 7 and the positioning ring 8 are connected through the hole in the leaf spring 9 and the threaded hole in the support sleeve 6, so that the leaf spring 9 is fixed to the support sleeve 6.

[0043] The positioning ring 8 and the positioning pin 7 are connected through the hole in the leaf spring 9 and the threaded hole in the support sleeve 6, so that the leaf spring 9 is fixed to the support sleeve 6.

[0044] Leaf spring 9: The positioning pin 7 and the positioning ring 8 are connected to the threaded hole on the support sleeve 6 through the hole on the leaf spring 9, so that the leaf spring 9 is fixed to the support sleeve 6, so that there is a certain gap between the leaf spring 9 and the middle body of the mandrel 2, which is convenient for the leaf spring 9 to deform inward. There is a dovetail structure on the leaf spring 9, which can cooperate with the dovetail groove of the brush body 10. The fixing pin 11 and the spiral retaining ring 14 are connected through the two holes on the leaf spring 9 and the two waist-shaped holes on the brush body 10, ensuring that the brush body 10 is fixed on the leaf spring 9. When the brush body 10 encounters resistance in the casing, it can shrink inward through the elasticity of the leaf spring 9, thereby protecting the brush body 10, thereby extending the service life of the brush body 10. At the same time, it can also effectively solve the anti-stuck problem of the brush scraper and avoid underground accidents.

[0045] Brush body 10: It is composed of a brush body and bristles. The dense bristles can effectively remove residual cement and mud blocks on the inner wall of the downhole casing, as well as rust, scale, hard paraffin and other debris on the production well casing that affect normal construction operations. There is a dovetail groove on the brush body 10, which can cooperate with the dovetail structure on the leaf spring 9. The fixing pin 11 and the spiral retaining ring 14 are connected through the two holes on the leaf spring 9 and the two waist-shaped holes on the brush body 10, ensuring that the brush body 10 is fixed on the leaf spring 9. The brush body 10 is staggered on different leaf springs 9, and the brush body 10 The bristles on the surface are also arranged in a staggered manner, which can make the bristles of the brush body 10 achieve extremely high coverage in the circumferential direction, thereby maintaining the cleaning efficiency of the brush scraper at a high level. Moreover, since the end of the brush body 10 without bristles is relatively slender, the flexibility of the brush body 10 can be improved, so that when the brush body 10 encounters resistance in the casing, it can shrink inward through the elasticity of the leaf spring 9, thereby protecting the brush body 10, thereby extending the service life of the brush body 10. At the same time, it can also effectively solve the anti-stuck problem of the brush scraper and avoid underground accidents.

[0046] Fixed pin 11: The fixed pin 11 and the spiral retaining ring 14 are connected through the two holes on the leaf spring 9 and the two waist-shaped holes on the brush body 10, ensuring that the brush body 10 is fixed on the leaf spring 9.

[0047] Lower spiral straightening sleeve 12: There is a semicircular circumferential groove inside the lower spiral straightening sleeve 12, and the semicircular circumferential groove has a radial screw hole for placing steel balls to achieve communication with the outside. It can be connected and sealed with the core shaft 2 through the steel ball 20, sealing plug 19, star ring 18, and lower wear-resistant belt 13, and the lower spiral straightening sleeve 12 can be kept flexible in the circumferential direction. The outer diameter of the lower spiral straightening sleeve 12 is larger than the upper joint 1 and smaller than the brush body 10 after installation. The outer surface of the upper spiral straightening sleeve is provided with several spiral grooves, which can have a straightening effect on the entire scraper in the sleeve of the working diameter of the scraper, thereby ensuring the normal operation of the brush scraper while reducing the life reduction and damage of the bristles on the surface of the brush body 10 caused by the deflection of the brush scraper in the sleeve, thereby extending the service life of the brush body 10. The lower spiral straightening sleeve 12 is provided with two internal spline grooves that cooperate with the external splines of the support sleeve 6, and there is a certain distance between the end face of the support sleeve 6 adjacent to the brush body 10 and the step surface of the core shaft 2, so that the support sleeve 6 and the positioning pin 7, positioning ring 8 and leaf spring 9 connected thereto can be consistent with the circumferential rotation of the lower spiral straightening sleeve 12 and have sufficient axial limitation.

[0048] Lower wear-resistant strip 13: The lower wear-resistant strip 13 can reduce the friction between the mandrel 2 and the lower spiral straightening sleeve 12, thereby preventing the mandrel 2 and the lower spiral straightening sleeve 12 from being damaged due to friction, thereby extending the service life of the scraper.

[0049] Spiral retaining ring 14: The spiral retaining ring 14 and the fixing pin 11 are connected through two holes on the leaf spring 9 and two waist-shaped holes on the brush body 10.

[0050] Lower sub 15: Lower sub 15 contains a water hole that allows drilling fluid to pass through. The lower connecting thread of lower sub 15 ensures the connection between the scraper and the lower part of the drill string system, while the upper thread ensures the connection between lower sub 15 and spindle 2. Screw 3 and washer 17 connect through the countersunk hole in lower sub 15 and the threaded hole in spindle 2, forming a reinforced connection between lower sub 15 and spindle 2, preventing the threads between lower sub 15 and spindle 2 from backing out. The lower sub 15 and spindle 2 are sealed by O-ring 16, which reduces pressure loss in the water hole and prevents drilling fluid inside and outside the scraper from entering the threads and affecting their life.

[0051] O-ring 16 : The upper joint 1 and the spindle 2 , as well as the lower joint 15 and the spindle 2 , are sealed by O-ring 16 .

[0052] Washer 17: Washer 17 is used in conjunction with screw 3 to provide a fixed connection between the spindle 2 and the upper joint 1, and between the spindle 2 and the lower joint 15.

[0053] Star ring 18: the seal between the mandrel 2 and the upper spiral centralizer 4 is through the star ring 18; the seal between the mandrel 2 and the lower spiral centralizer 12 is also through the star ring 18.

[0054] Sealing plug 19: the sealing plug 19 is connected with the steel ball placement hole on the upper spiral centralizer 4 and the lower spiral centralizer 12 through threads, thereby plugging and sealing the installation hole of the steel ball 20.

[0055] Steel ball 20: installed between the mandrel 2 and the upper spiral centralizer 4, and between the mandrel 2 and the lower spiral centralizer 12, limiting the axial displacement of the upper spiral centralizer 4 and the lower spiral centralizer 12 on the mandrel 2, while ensuring that the upper spiral centralizer 4 and the lower spiral centralizer 12 can rotate flexibly.

Claims

1. A brush pipe scraper, characterized in that: The invention comprises a mandrel (2), the two ends of the mandrel (2) are fixedly connected to the upper joint (1) and the lower joint (15) respectively, the upper and lower parts of the mandrel (2) are movably sleeved with an upper spiral straightening sleeve (4) and a lower spiral straightening sleeve (12), each of the upper spiral straightening sleeve (4) and the lower spiral straightening sleeve (12) is provided with a support sleeve (6) inside, the support sleeve (6) is sleeved on the mandrel (2), a plurality of leaf springs (9) are connected between the two support sleeves (6), a brush body (10) is fixed in the middle of each leaf spring (9), the mandrel (2) is a stepped structure with large ends and small middle, the upper spiral straightening sleeve (4) and the lower spiral straightening sleeve (12) are respectively installed at the large diameters of the two ends of the mandrel (2), there is a gap between the main structure of the leaf spring (9) and the outer wall of the middle part of the mandrel (2), the outer diameters of the upper spiral straightening sleeve (4) and the lower spiral straightening sleeve (12) are larger than the upper joint (1) and smaller than the brush body (10) after installation.

2. A brush pipe scraper according to claim 1, characterized in that: The spindle (2) is threadedly connected to the upper joint (1) and the lower joint (15). O-rings (16) are provided above and below the threaded connections between the spindle (2) and the upper joint (1), and between the spindle (2) and the lower joint (15). The upper joint (1) and the lower joint (15) are also fixedly connected to the spindle (2) via screws (3) and washers (17).

3. The brush pipe scraper according to claim 1, characterized in that: The outer portion of the upper end of the spindle (2) and the inner portion of the upper spiral straightening sleeve (4) are provided with corresponding semicircular circumferential grooves. The outer circumference of the upper spiral straightening sleeve (4) is also provided with a steel ball placement screw hole connected to the semicircular circumferential groove inside the upper spiral straightening sleeve (4). The steel ball (20) is placed into the circular circumferential groove formed by the spindle (2) and the upper spiral straightening sleeve (4) through the steel ball placement screw hole and is sealed by a sealing plug (19) threadedly connected to the steel ball placement screw hole. The spindle (2) and the upper spiral straightening sleeve (4) above and below the steel ball (20) are sealed by a star ring (18). An upper wear-resistant belt (5) is also provided on the outer circumference of the spindle (2) covered by the upper spiral straightening sleeve (4).

4. The brush pipe scraper according to claim 1, characterized in that: The outer portion of the lower end of the spindle (2) and the inner portion of the lower spiral straightening sleeve (12) are provided with corresponding semicircular circumferential grooves. The outer circumference of the lower spiral straightening sleeve (12) is also provided with a steel ball placement screw hole connected to the semicircular circumferential groove inside the spindle (12). The steel ball (20) is placed into the circular circumferential groove formed by the spindle (2) and the lower spiral straightening sleeve (12) through the steel ball placement screw hole and is sealed by a sealing plug (19) threadedly connected to the steel ball placement screw hole. The spindle (2) and the lower spiral straightening sleeve (12) above and below the steel ball (20) are sealed by a star ring (18). A lower wear-resistant belt (13) is also provided on the outer circumference of the spindle (2) covered by the lower spiral straightening sleeve (12).

5. The brush pipe scraper according to claim 1, characterized in that: The outer circumferential surfaces of the upper spiral straightening sleeve (4) and the lower spiral straightening sleeve (12) are provided with a plurality of spiral grooves. The inner surfaces of the upper spiral straightening sleeve (4) and the lower spiral straightening sleeve (12) are provided with inner spline grooves, which cooperate with the outer splines on the outer wall of the support sleeve (6). There is a certain distance between the end faces of the two support sleeves (6) adjacent to the brush body (10) and the step surface of the core shaft (2).

6. The brush pipe scraper according to claim 1, characterized in that: The leaf spring (9) is provided with holes at both ends, and the holes at both ends correspond to the positions of the threaded holes on the two support sleeves (6), and the positioning pin (7) and the positioning ring (8) are connected to the threaded holes on the support sleeves (6) through the holes on the leaf spring (9).

7. The brush pipe scraper according to claim 1, characterized in that: A dovetail structure is provided on the outer surface of the middle portion of the leaf spring (9), and the dovetail structure cooperates with the dovetail groove of the brush body (10). The leaf spring (9) is also provided with a plurality of holes, each hole corresponding to a waist-shaped hole on the brush body (10). The fixing pin (11) extends from the hole on the leaf spring (9) into the waist-shaped hole on the brush body (10), and the back of the fixing pin (11) is locked and fixed by a spiral retaining ring (14).

8. The brush pipe scraper according to claim 1, characterized in that: The brush body (10) is composed of a brush body and bristles. Adjacent brush bodies (10) are installed in an upper and lower staggered manner on different leaf springs (9), and the bristles on the surface of the brush body (10) are also arranged in a staggered manner. The end of the brush body (10) without bristles is a slender structure.

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