Scraping, brushing and sucking integrated drilling operation combined device

Abstract

The utility model discloses a scraping, brushing and sucking integrated drilling operation combined device which comprises a heavy pipe scraper, a brush pipe scraper and an efficient strong magnetic fisher which are connected together from bottom to top. The brush pipe scraper comprises a mandrel, the two ends of the mandrel are connected with an upper connector and a lower connector respectively, the upper portion and the lower portion of the mandrel are sleeved with an upper spiral centralizing sleeve and a lower spiral centralizing sleeve respectively, the upper spiral centralizing sleeve and the lower spiral centralizing sleeve are each internally provided with a supporting sleeve, the mandrel is sleeved with the supporting sleeves, and a plurality of plate spring pieces are connected between the two supporting sleeves. A hairbrush body is fixed in 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 device not only is simple in structure, low in manufacturing cost and long in service life, but also effectively solves the problems that the cleaning efficiency is low and cleaning is not thorough in the casing cleaning process, and meanwhile underground accidents are avoided.

Description

TECHNICAL FIELD

[0001] The utility model relates to a kind of drilling operation combination devices, in particular to a kind of scraping brush suction integrated drilling operation combination devices. BACKGROUND

[0002] New well is before and after perforating, the sundries in casing is cleaned, to protect fracturing operation formation not to be contaminated, while ensuring that subsequent operation tool is smoothly lowered into.But the existing casing cleaning device cleaning efficiency is not high, and it is easy to clean not thoroughly, will remain part of cement, mud block and the sundries such as iron rust, limescale, hard paraffin on production well casing, which affects normal construction operation, is prone to jamming phenomenon with the casing of poor working conditions, leading to downhole accident. SUMMARY

[0003] The utility model discloses a kind of scraping brush suction integrated drilling operation combination devices.The device not only simple structure, low in manufacturing cost, long service life, but also effectively solve the problem of low cleaning efficiency in casing cleaning process, cleaning not thoroughly, while avoiding downhole accident.

[0004] The utility model discloses a kind of scraping brush suction integrated drilling operation combination devices, including by the order of from bottom to top connection together's heavy scraping device, brush scraping device and high-efficiency strong magnetic fishing device;The brush scraping device includes mandrel, and the both ends of mandrel are fixedly connected with upper joint and lower joint, and the upper and lower of mandrel are movably sleeved with upper helical centralizer and lower helical centralizer, and one support sleeve is arranged in each of the inside of upper helical centralizer and lower helical centralizer, and the support sleeve is sleeved on mandrel, and a plurality of leaf springs are connected between two support sleeves, and one brush body is fixed in the middle of each leaf spring, and the mandrel is the stepped structure of two ends large middle small, and upper helical centralizer and lower helical centralizer are installed at the large diameter of the both ends of mandrel, and there is spacing between the main body structure of leaf spring and the outer wall of the middle of mandrel, and the outer diameter of upper helical centralizer and lower helical centralizer is greater than upper joint and less than the brush body after installation.

[0005] In the foregoing scraping brush suction integrated drilling operation combination device, the heavy scraping device, the brush scraping device and the high-efficiency strong magnetic fishing device are connected with each other through threads.

[0006] In the foregoing scraping brush suction integrated drilling operation combination device, the mandrel is threadedly connected with the upper joint and the lower joint, and O-rings are further arranged between the upper and lower of the threadedly connected portions of the mandrel and the upper joint and the lower joint, and the upper joint and the lower joint are further fixedly connected with the mandrel through screws and washers.

[0007] In the foregoing scraping and brushing integrated drilling operation combined device, the outer part of the upper end of the mandrel and the inner part of the upper spiral centralizing sleeve are provided with corresponding semicircular circumferential grooves, the outer periphery of the upper spiral centralizing sleeve is further provided with steel ball placing screw holes in communication with the semicircular circumferential grooves in the inner part thereof, the steel balls are placed into the circular circumferential groove formed by the mandrel and the upper spiral centralizing sleeve through the steel ball placing screw holes, and the steel balls are sealed by the sealing plugs threadedly connected with the steel ball placing screw holes, the mandrel and the upper spiral centralizing sleeve above and below the steel balls are sealed by the star-shaped ring, and the outer periphery of the mandrel shielded by the upper spiral centralizing sleeve is further provided with an upper wear-resistant band.

[0008] In the foregoing scraping and brushing integrated drilling operation combined device, the outer part of the lower end of the mandrel and the inner part of the lower spiral centralizing sleeve are provided with corresponding semicircular circumferential grooves, the outer periphery of the lower spiral centralizing sleeve is further provided with steel ball placing screw holes in communication with the semicircular circumferential grooves in the inner part thereof, the steel balls are placed into the circular circumferential groove formed by the mandrel and the lower spiral centralizing sleeve through the steel ball placing screw holes, and the steel balls are sealed by the sealing plugs threadedly connected with the steel ball placing screw holes, the mandrel and the lower spiral centralizing sleeve above and below the steel balls are sealed by the star-shaped ring, and the outer periphery of the mandrel shielded by the lower spiral centralizing sleeve is further provided with a lower wear-resistant band.

[0009] In the foregoing scraping and brushing integrated drilling operation combined device, the outer circular surface of the upper spiral centralizing sleeve and the lower spiral centralizing sleeve is provided with a plurality of spiral grooves, the inner part of the upper spiral centralizing sleeve and the lower spiral centralizing sleeve is provided with an inner spline groove, the inner spline groove is matched with the outer spline on the outer wall of the supporting sleeve, and the end faces of the two supporting sleeves adjacent to the brush body are a certain distance away from the stepped surface of the mandrel.

[0010] In the foregoing scraping and brushing integrated drilling operation combined device, the both ends of the leaf spring are provided with holes, the holes at both ends are respectively in position correspondence with the threaded holes on the two supporting sleeves, and the positioning pin and the positioning ring are connected through the holes on the leaf spring and the threaded holes on the supporting sleeve.

[0011] In the foregoing scraping and brushing integrated drilling operation combined device, the outer surface of the middle part of the leaf spring is provided with a dovetail structure matched with the dovetail groove of the brush body, the leaf spring is further provided with a plurality of holes, each hole is in position correspondence with a waist-shaped hole on the brush body, the fixing pin extends into the waist-shaped hole on the brush body from the hole on the leaf spring, and the back part of the fixing pin is locked and fixed by the spiral check ring.

[0012] In the foregoing scraping and brushing integrated drilling operation combined device, the brush body is composed of a brush body and brush hairs, adjacent brush bodies are installed in an upper and lower staggered manner on different leaf springs, the brush hairs on the surface of the brush body are also staggered, and the end of the brush body without brush hairs is an elongated structure.

[0013] The utility model discloses an advantageous effect: compared with prior art, the utility model provides a kind of scraping and brushing integrated drilling operation combination device, the device can realize scraping and brushing integrated operation, during use, the scraper on heavy scraping tool first scrapes the cement, mud block and so on deposited more seriously on casing inner surface, iron rust, scale, hard paraffin etc. BRIEF DESCRIPTION OF DRAWINGS

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

[0015] Figure 2 It is structure schematic view of the utility model;

[0016] Figure 3 It is structure schematic view of the utility model;

[0017] Figure 4 It is structure schematic view of the utility model;

[0018] Figure 5 It is structure schematic view of the utility model; Figure 4 It is structure schematic view of the utility model;

[0019] Figure 6 It is structure schematic view of the utility model;

[0020] Figure 7 It is structure schematic view of the utility model; Figure 6 It is structure schematic view of the utility model;

[0021] Figure 8 It is structure schematic view of the utility model.

[0022] Reference numeral: 1-upper joint, 2-heart axle, 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-gasket, 18-star ring, 19-sealing plug, 20-steel ball, 21-heavy scraping tool, 22-brush scraping tool, 23-high-efficiency strong magnetic fishing tool. DETAILED DESCRIPTION

[0023] The utility model will be further described below in combination with the drawings and examples, but not as the basis for limiting the utility model.

[0024] Embodiment: a kind of scraping brush suction integrated drilling operation combination device, including by lower to upper sequence connection together heavy-duty scraper 21, brush scraper 22 and high-efficiency strong magnetic fisher 23.Thereinto, heavy-duty scraper 21 and high-efficiency strong magnetic fisher 23 can adopt existing mature product, such as heavy-duty scraper 21 can adopt the technical scheme in the patent CN201521092412.9 of our company application, high-efficiency strong magnetic fisher 23 can adopt the technical scheme in the patent CN202123370211.9 of our company application.Therefore the specific structure of heavy-duty scraper 21 and high-efficiency strong magnetic fisher 23 is not introduced in detail here.

[0025] The device can be disassembled into three parts according to function.

[0026] Heavy-duty scraper 21: an effective tool for scraping the inner wall of casing, which only needs to move up and down to scrape the casing, and can rotate when other tools are rotated with drill string downhole, so that the whole scraper part does not rotate with the mandrel and does not scratch the casing wall. The tool is simple in structure and flexible in operation. The right-hand scraper and the left-hand scraper are seated on the disc spring seat and the disc spring. When the heavy-duty scraper enters the casing, the scraper is pressed and compressed by the disc spring, and the scraper is attached to the inner wall of the casing. Pulling and pressing the tool up and down, the inner wall of the casing is scraped.

[0027] Brush scraper 22: mainly relies on the brush body 10 to brush and clean the scraped inner wall of the casing during operation. After scraping to the predetermined scraping depth, the steel wire brush clusters on the brush body 10 are pressed onto the inner wall of the casing. By pulling and pressing the scraped pipe column multiple times, the steel wire brush can brush off a small amount of residual cement, scale, hard paraffin and other debris on the inner wall of the casing, achieving the effect of cleaning the inner wall of the casing and ensuring the cleaning quality of the casing during the whole operation process.

[0028] High-efficiency strong magnetic fisher 23: a fishing tool for recycling iron filings and dirt generated during the cleaning operation of oil, geological drilling and casing repair that cannot be returned by circulating fluid. The magnetic debris is attracted to the outer pipe at the magnetic ring position, and the sediment in the recycling cylinder is brought out of the well by circulation. It has the properties of simple structure, convenient operation and reliable performance. The small falling objects are magnetized and lifted by the permanent magnet, thereby effectively fishing the falling objects and achieving the purpose of purifying the well bottom. Its function is to recycle the dirt that cannot be returned by circulating fluid downhole. The magnetic debris is attracted to the magnetic ring, and the sediment in the recycling cylinder is brought out of the well.

[0029] The brush pipe scraper 22 comprises a mandrel 2, the two ends of the mandrel 2 are fixedly connected with the upper joint 1 and the lower joint 15 respectively, the upper spiral centralizing sleeve 4 and the lower spiral centralizing sleeve 12 are movably sleeved above and below the mandrel 2 respectively, the upper spiral centralizing sleeve 4 and the lower spiral centralizing sleeve 12 can realize flexible rotation in the circumferential direction compared with the mandrel 2, but cannot realize axial displacement. The inner part of the upper spiral centralizing sleeve 4 and the lower spiral centralizing sleeve 12 is respectively provided with a support sleeve 6, the support sleeve 6 is sleeved on the mandrel 2, the support sleeve 6 can rotate with the upper spiral centralizing sleeve 4 and the lower spiral centralizing sleeve 12, and can also realize axial displacement. A plurality of leaf spring pieces 9 are fixedly connected between the two support sleeves 6, a brush body 10 is fixedly arranged in the middle of each leaf spring piece 9, the mandrel 2 is a stepped structure with large ends and small middle, the upper spiral centralizing sleeve 4 and the lower spiral centralizing sleeve 12 are respectively arranged at the large-diameter positions of the two ends of the mandrel 2, and there is a spacing between the main body structure of the leaf spring piece 9 and the outer wall of the middle part of the mandrel 2, which is the space for the deformation of the leaf spring piece 9. When the brush body 10 meets resistance in the casing, the leaf spring piece 9 can be elastically retracted inward, which can protect the brush body 10 and prolong the service life of the brush body 10, and can also effectively solve the problem of pipe jamming of the brush pipe scraper and avoid the occurrence of downhole accidents. In the process of elastic retraction of the leaf spring piece 9, the support sleeve 6 fixedly connected with the leaf spring piece 9 moves axially towards the direction of the brush body 10. The outer diameters of the upper spiral centralizing sleeve 4 and the lower spiral centralizing sleeve 12 are greater than the outer diameter of the upper joint 1 and less than the outer diameter of the installed brush body 10, so that the upper spiral centralizing sleeve 4 and the lower spiral centralizing sleeve 12 have the effect of centralizing.

[0030] The heavy-duty pipe scraper 21, the brush pipe scraper 22 and the high-efficiency strong magnetic fisher are connected with each other through threads, which facilitates the connection, disassembly and replacement between the devices.

[0031] The mandrel 2 is threadedly connected with the upper joint 1 and the lower joint 15, and O-rings 16 are arranged above and below the threadedly connected positions of the mandrel 2 with the upper joint 1 and the lower joint 15. The upper joint 1 and the lower joint 15 are further fixedly connected with the mandrel 2 through screws 3 and gaskets 17.

[0032] A semicircular circumferential groove is arranged on the outer part of the upper end of the mandrel 2 and the inner part of the upper spiral centralizing sleeve 4, a steel ball placing screw hole is further arranged on the outer periphery of the upper spiral centralizing sleeve 4 and communicates with the semicircular circumferential groove in the inner part of the upper spiral centralizing sleeve 4, a steel ball 20 is placed into the circular circumferential groove formed by the mandrel 2 and the upper spiral centralizing sleeve 4 through the steel ball placing screw hole, and the steel ball 20 is sealed by a star-shaped ring 18 above and below the mandrel 2 and the upper spiral centralizing sleeve 4, and an upper wear-resistant strip 5 is further arranged on the outer periphery of the mandrel 2 which is shielded by the upper spiral centralizing sleeve 4.

[0033] 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 semicircular 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.

[0034] 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.

[0035] 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.

[0036] 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.

[0037] 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.

[0038] The structures of the various components of the brush pipe scraper 22 and their functions are introduced as follows:

[0039] The upper joint 1 has a water eye in it, through which drilling fluid can pass, and the upper joint 1 is connected with the upper part of the drill string system through the upper connecting thread, and is connected with the mandrel 2 through the lower thread. The screw 3 and the gasket 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 threads between the upper joint 1 and the mandrel 2 cannot be backed off, and the upper joint 1 and the mandrel 2 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 utility model from entering the inside of the threads and affecting the service life of the threads.

[0040] The mandrel 2 has a water eye inside, through which drilling fluid can pass. The mandrel 2 is connected to the upper joint 1 by threads. The screw 3 and the washer 17 are connected to the threaded hole on the mandrel 2 through the countersunk hole on the upper joint 1, so that a reinforced connection is formed between the upper joint 1 and the mandrel 2, the threads between the upper joint 1 and the mandrel 2 cannot be backed off, and the upper joint 1 and the mandrel 2 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 pipe scraper from entering the threads and affecting the service life of the threads.

[0041] The upper end of the mandrel 2 has a corresponding semicircular circumferential groove on the outside, forming a circular circumferential groove. The mandrel 2 and the upper spiral centralizer 4 are connected by a certain number of steel balls 20. The steel balls 20 are placed in the circular circumferential groove. The sealing plug 19 is connected to the steel ball placement screw hole on the upper spiral centralizer 4 by threads, thereby sealing the steel ball placement screw hole of the steel ball 20. The mandrel 2 and the upper spiral centralizer 4 above and below the steel ball 20 are sealed by the star-shaped ring 18, thereby reducing the adverse effects of the drilling fluid inside and outside on the steel ball 20. The upper wear-resistant band 5 between the mandrel 2 and the upper spiral centralizer 4 can reduce the friction between them.

[0042] The connection and sealing between the mandrel 2 and the lower spiral centralizer 12 are the same as those between the mandrel 2 and the upper spiral centralizer 4, and are also sealed by the star-shaped ring 18. The lower wear-resistant band 13 reduces friction.

[0043] The mandrel 2 is connected to the lower joint 15 by lower threads. The screw 3 and the washer 17 are connected to the threaded hole on the mandrel 2 through the countersunk hole on the lower joint 15, so that a reinforced connection is formed between the upper joint 1 and the mandrel 2, the threads between the upper joint 1 and the mandrel 2 cannot be backed off, and the mandrel 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 pipe scraper from entering the threads and affecting the service life of the threads.

[0044] The screw 3 is used in combination with the washer 17 to serve as a fixed connection between the upper joint 1 and the mandrel 2, and between the lower joint 15 and the mandrel 2.

[0045] The upper spiral centralizer 4 has a semicircular circumferential groove inside and a steel ball placing 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 reducing the damage of the brush body 10 surface brush due to the deflection of the brush scraping device in the casing, prolonging the service life of the brush body 10 while ensuring the normal operation of the brush scraping device. The inner spline groove of 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.

[0046] The upper wear-resistant strip 5 can reduce the friction between the mandrel 2 and the upper spiral centralizer 4, avoid damage of the mandrel 2 and the upper spiral centralizer 4 due to friction, and prolong the service life of the scraping device.

[0047] The outer spline of the support sleeve 6 is matched with the two inner spline grooves of the upper spiral centralizer 4 and the lower spiral centralizer 12

[0048] 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 on the leaf spring 9 and the threaded hole on the support sleeve 6, so that the leaf spring is fixed to the support sleeve 6.

[0049] The positioning pin 7 and the positioning ring 8 are connected through the hole on the leaf spring 9 and the threaded hole on the support sleeve 6, so that the leaf spring 9 is fixed to the support sleeve 6.

[0050] The positioning ring 8 and the positioning pin 7 are connected through the hole on the leaf spring 9 and the threaded hole on the support sleeve 6, so that the leaf spring 9 is fixed to the support sleeve 6.

[0051] Plate spring 9: The positioning pin 7 and the positioning ring 8 are connected through the hole on the plate spring 9 and the threaded hole on the support sleeve 6, so that the plate spring 9 is fixed to the support sleeve 6, so that there is a certain gap between the plate spring 9 and the middle body of the mandrel 2, which is convenient for the inward deformation of the plate spring 9. The plate spring 9 has a dovetail structure which can cooperate with the dovetail groove of the brush body 10. The fixing pin 11 and the spiral retainer ring 14 are connected through two holes on the plate spring 9 and two waist-shaped holes on the brush body 10, which ensures that the brush body 10 is fixed on the plate spring 9, so that the brush body 10 can be retracted inward through the elasticity of the plate spring 9 when it meets resistance in the sleeve, thereby protecting the brush body 10 and prolonging the service life of the brush body 10. At the same time, it can effectively solve the anti-blocking problem of the brush pipe scraper, and avoid accidents in the well.

[0052] Brush body 10: composed of brush body and bristles, dense bristles can effectively remove residual cement, mud and other debris 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. The brush body 10 has a dovetail groove which can cooperate with the dovetail structure on the plate spring 9. The fixing pin 11 and the spiral retainer ring 14 are connected through two holes on the plate spring 9 and two waist-shaped holes on the brush body 10, which ensures that the brush body 10 is fixed on the plate spring 9. The brush body 10 is installed on different plate springs 9 in a staggered manner, and the bristles on the surface of the brush body 10 are also arranged in a staggered manner, which can make the bristles of the brush body 10 achieve a high coverage in the circumferential direction, thereby keeping the cleaning efficiency of the brush pipe scraper at a high level. Since the non-bristle end of the brush body 10 is relatively slender, the flexibility of the brush body 10 can be improved, so that the brush body 10 can be retracted inward through the elasticity of the plate spring 9 when it meets resistance in the sleeve, thereby protecting the brush body 10 and prolonging the service life of the brush body 10. At the same time, it can effectively solve the anti-blocking problem of the brush pipe scraper, and avoid accidents in the well.

[0053] Fixing pin 11: The fixing pin 11 and the spiral retainer ring 14 are connected through two holes on the plate spring 9 and two waist-shaped holes on the brush body 10, which ensures that the brush body 10 is fixed on the plate spring 9.

[0054] Lower helical centralizer 12: The lower helical centralizer 12 has a semicircular circumferential groove inside, and a steel ball placement screw hole is opened in the radial direction to realize communication with the outside. It can be connected and sealed with the mandrel 2 through the steel ball 20, the sealing plug 19, the star-shaped ring 18, the lower wear-resistant band 13, and can flexibly move in the circumferential direction. The outer diameter of the lower helical centralizer 12 is greater than the upper connector 1 and smaller than the installed brush body 10. The outer circular surface of the upper helical centralizer is provided with several helical grooves, which can play a centralizing effect on the entire scraping tool in the working diameter of the scraping tool. Thus, while ensuring the normal operation of the brush scraping tool, the service life of the brush body 10 is prolonged, and the service life of the brush body 10 is prolonged. The lower helical centralizer 12 has two internal spline grooves inside, which are matched with the external spline of the support sleeve 6. There is a certain distance between the end face of the support sleeve 6 near the brush body 10 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 thereto can rotate in the circumferential direction and have sufficient limiting in the axial direction.

[0055] Lower wear-resistant band 13: The lower wear-resistant band 13 can reduce the friction between the mandrel 2 and the lower helical centralizer 12, avoid damage of the mandrel 2 and the lower helical centralizer 12 due to friction, and prolong the service life of the scraping tool.

[0056] Spiral check ring 14: The spiral check ring 14 and the fixed pin 11 are connected through two holes on the leaf spring 9 and two waist-shaped holes on the brush body 10.

[0057] Lower connector 15: The lower connector 15 has a water eye, through which drilling fluid can pass. The lower connector 15 is connected with the lower part of the drilling string system through the lower connecting thread, and is connected with the mandrel 2 through the upper thread. The screw 3 and the washer 17 are connected through the countersunk hole on the lower connector 15 and the threaded hole on the mandrel 2, so that a reinforced connection is formed between the lower connector 15 and the mandrel 2, and the thread between the lower connector 15 and the mandrel 2 will not be backed off. The lower connector 15 and the mandrel 2 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 scraping tool from entering the thread inside to affect the service life of the thread.

[0058] O-ring 16: The upper connector 1 and the mandrel 2, and the lower connector 15 and the mandrel 2 are sealed by the O-ring 16.

[0059] Washer 17: The washer 17 is used in cooperation with the screw 3 to play a role in fixed connection between the mandrel 2 and the upper connector 1, and the mandrel 2 and the lower connector 15.

[0060] 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.

[0061] 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.

[0062] 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 combination drilling apparatus of the type comprising a drill string, a drill bit, a drill string cleaning device and a drill string cleaning device, characterized in that: The utility model provides a heavy -duty scraper (21), brush scraper (22) and high -efficient strong magnet fishing device (23) are connected together in order from bottom to top, the brush scraper (22) includes the mandrel (2), and the both ends of mandrel (2) are fixedly connected with upper joint (1) and lower joint (15) respectively, and the upper and lower of mandrel (2) are movably sleeved with upper spiral centralising sleeve (4) and lower spiral centralising sleeve (12) respectively, and each is provided with a support sleeve (6) in the inside of upper spiral centralising sleeve (4) and lower spiral centralising sleeve (12), and the support sleeve (6) is sleeved on the mandrel (2), and a plurality of leaf springs (9) are connected between the two support sleeves (6), and each leaf spring (9) is fixed with a brush body (10) in the middle, and the mandrel (2) is the stepped structure of big two ends and small middle, and the upper spiral centralising sleeve (4) and lower spiral centralising sleeve (12) are installed at the big diameter of the two ends of mandrel (2) respectively, and there is spacing between the main body structure of leaf spring (9) and the outer wall of the middle of mandrel (2), and the outer diameter of upper spiral centralising sleeve (4) and lower spiral centralising sleeve (12) is greater than upper joint (1) and is less than the brush body (10) after installation.

2. The combined scraping and brushing device according to claim 1, characterized in that: The heavy -duty scraper (21), brush scraper (22) and high -efficient strong magnet fishing device (23) are connected through threads.

3. The combined scraping and brushing device according to claim 1, characterized in that: The mandrel (2) is threadedly connected with the upper joint (1) and the lower joint (15), and O-rings (16) are arranged between the upper and lower threads of the mandrel (2) and the upper joint (1) and the lower joint (15), and the upper joint (1) and the lower joint (15) are fixedly connected with the mandrel (2) through screws (3) and washers (17).

4. The combined scraping and brushing device according to claim 1, characterized in that: Corresponding semicircular circumferential grooves are arranged on the outer part of the upper end of the mandrel (2) and the inner part of the upper spiral centralising sleeve (4), a steel ball placing screw hole is further arranged on the outer periphery of the upper spiral centralising sleeve (4) and communicates with the semicircular circumferential groove in the inner part of the upper spiral centralising sleeve (4), a steel ball (20) is placed in the circular circumferential groove formed by the mandrel (2) and the upper spiral centralising sleeve (4) through the steel ball placing screw hole, and the steel ball (20) is sealed by a star-shaped ring (18) between the upper and lower mandrels (2) and upper spiral centralising sleeves (4), and an upper wear-resistant band (5) is further arranged on the outer periphery of the mandrel (2) shielded by the upper spiral centralising sleeve (4).

5. The combined scraping and brushing device according to claim 1, characterized in that: Corresponding semicircular circumferential grooves are arranged on the outer part of the lower end of the mandrel (2) and the inner part of the lower spiral centralising sleeve (12), a steel ball placing screw hole is further arranged on the outer periphery of the lower spiral centralising sleeve (12) and communicates with the semicircular circumferential groove in the inner part of the lower spiral centralising sleeve (12), a steel ball (20) is placed in the circular circumferential groove formed by the mandrel (2) and the lower spiral centralising sleeve (12) through the steel ball placing screw hole, and the steel ball (20) is sealed by a star-shaped ring (18) between the upper and lower mandrels (2) and lower spiral centralising sleeves (12), and a lower wear-resistant band (13) is further arranged on the outer periphery of the mandrel (2) shielded by the lower spiral centralising sleeve (12).

6. The combined scraping and brushing device according to claim 1, characterized in that: The upper spiral centralizing sleeve (4) and the lower spiral centralizing sleeve (12) are provided with a plurality of spiral grooves on the outer circumferential surface, and the inner spline groove in the upper spiral centralizing sleeve (4) and the lower spiral centralizing sleeve (12) is matched with the outer spline on the outer wall of the supporting sleeve (6), and the end face of the two supporting sleeves (6) adjacent to the brush body (10) is a certain distance from the stepped surface of the mandrel (2).

7. The combined scraping and brushing device according to claim 1, characterized in that: The plate spring piece (9) is provided with holes at both ends, and the holes at both ends are respectively matched with the threaded holes on the two supporting sleeves (6), and the positioning pin (7) and the positioning ring (8) are connected with the threaded holes on the supporting sleeves (6) through the holes on the plate spring piece (9).

8. The combined scraping and brushing device according to claim 1, characterized in that: The plate spring piece (9) is provided with a dovetail structure on the outer surface of the middle part, and the dovetail structure is matched with the dovetail groove of the brush body (10), and the plate spring piece (9) is also provided with a plurality of holes, and each hole is matched with a waist-shaped hole on the brush body (10), and the fixing pin (11) extends into the waist-shaped hole on the brush body (10) from the hole on the plate spring piece (9), and the back of the fixing pin (11) is locked and fixed through the spiral check ring (14).

9. The combined scraping and brushing device according to claim 1, characterized in that: 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 spring pieces (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.

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