A hydraulic pipe scraper while drilling and method of use

Abstract

The application relates to a hydraulic pipe scraping device for drilling and a use method, which comprises an upper joint, a shell, a reset device, a scraping device, a pushing device, a control device and an activation device. The reset device comprises a long inner shaft cover, a switchable long inner shaft, a spring cover, a reset spring, a spring ring and a spring guide block; the scraping device comprises a cutter block, a scraping plate and a cutter block baffle; the pushing device comprises a piston, a driving piece and an outer cover; the control device comprises a control short circuit, a track main shaft, a track main shaft cover, a ball seat reset spring, a lock block cover and a lock block support cover; and the activation device comprises an intermediate short circuit, a ball seat, an activation ball, a ball blue and a lower joint. The application realizes accurate control of the scraping device through the control device and the activation device, effectively improves pipe scraping efficiency and reliability, and reduces drilling cost.

Description

Technical Field

[0001] This application relates to the field of oilfield tool technology, and in particular to a hydraulic pipe scraper used while drilling and its method of use. Background Technology

[0002] With the continuous development of drilling technology, deep wells and ultra-deep wells have become the focus of drilling development. Due to the complexity of formation conditions and construction processes, the inner wall of the casing is often covered with a large amount of cement blocks, cement rings, hard wax, various salt crystals or deposits, perforation burrs, and iron oxide produced by casing corrosion, making it difficult to smoothly lower various downhole tools such as fishing tubes, centralizers, and packers. Generally, casing inner wall cleaning operations, i.e., casing scraping operations, are adopted.

[0003] To ensure the effective execution of pipe scraping operations, the conventional technique involves running a well cleaning assembly after drilling is completed. After well cleaning is finished, a pipe scraper is then run in for pipe scraping. However, most pipe scrapers currently use a mechanical structure, which is activated when it enters the well and remains running with the drill string, causing significant inconvenience.

[0004] Because scraping operations require tripping out of the well and changing drill string assemblies, the process is complex, time-consuming, and costly. Therefore, achieving scraping while drilling has become one of the urgent technical challenges for deep and ultra-deep wells in order to reduce costs and improve drilling efficiency. Summary of the Invention

[0005] To address the aforementioned issues, this application provides a hydraulic pipe scraper used while drilling and its application method.

[0006] Firstly, the hydraulic pipe scraper provided in this application adopts the following technical solution:

[0007] A hydraulic pipe scraper while drilling, comprising:

[0008] Upper connector, which is connected to the drilling rig;

[0009] A housing, wherein the top end is threadedly connected to the upper connector;

[0010] A reset device, disposed inside the housing, comprises a long inner shaft sleeve, a switchable long inner shaft, a spring sleeve, a reset spring, a spring ring, and a spring guide block. The long inner shaft sleeve is disposed inside the housing and is fixedly connected to the interior of the housing via threads. The switchable long inner shaft is disposed inside the long inner shaft sleeve and is threadedly connected to the inner wall of the long inner shaft sleeve, extending towards the bottom of the housing. The spring sleeve is disposed inside the housing and is threadedly connected to the interior of the housing, located at the bottom end of the long inner shaft sleeve. The top end of the spring sleeve abuts against the bottom end of the long inner shaft sleeve, and a reset spring is disposed inside it. The bottom end of the reset spring abuts against the spring ring. The spring guide block is fixedly connected to the spring ring by screws and is sleeved on the outside of the bottom end of the reset spring.

[0011] A scraping device, located inside the housing at the bottom of the reset device, includes a circumferentially evenly spaced receiving groove on the housing and a scraping component disposed within the receiving groove. The scraping component includes a cutting block, a scraper plate disposed outside the cutting block, and a cutting block baffle that fixes the scraper plate to the cutting block. An inclined sliding groove is formed on the side wall of the receiving groove, with the sliding groove facing upwards near the outer wall of the housing and downwards away from the outer wall of the housing. A slider corresponding to the sliding groove is disposed on the side of the cutting block. The relative movement of the sliding groove and the slider controls the movement of the cutting block toward or away from the central axis of the housing.

[0012] A pushing device, located inside the housing at the bottom of the scraping device, includes a piston, a driving component, and an outer sleeve. The piston is sleeved on the outside of the switchable long inner shaft. The driving component is sleeved on the top of the piston and includes a driving ring and a driving block. The driving ring is threadedly connected to the piston, and the driving block is threadedly connected to the driving ring. The driving block is located within the receiving groove. The top end of the outer sleeve abuts against the bottom end of the piston and is threadedly connected to the housing.

[0013] The control device includes a control short circuit, a track spindle, a track spindle sleeve, a ball seat return spring, a locking block sleeve, and a locking block support sleeve. The control short circuit is threadedly connected to the bottom of the housing. The track spindle is located inside the control short circuit, with its top sleeved on the outside of the switchable long inner shaft. The top inner wall of the control short circuit fits against the outer wall of the track spindle. The track spindle sleeve is sleeved on the outside of the track spindle, with bearings abutting at both ends. A baffle is provided on the track spindle, and the baffle abuts against the bottom of the bearing at the bottom of the track spindle sleeve. A bearing retaining ring is provided on the top of the bearing at the top of the track spindle sleeve, and the bearing retaining ring is detachably connected to the track spindle by a circumferentially installed screw. The ball seat return spring is located at the bottom of the baffle, with its other end abutting against the locking block sleeve. A slot is formed circumferentially in the locking block sleeve, and a hole corresponding to the slot is formed inside the control short circuit. A key is provided in the slot and connected to the control short circuit through the key. The locking block support sleeve is threadedly connected inside the locking block sleeve.

[0014] An activation device, located at the bottom of the control device, includes a central short circuit, a ball seat, an activation ball, a ball basket, and a lower connector. One end of the central short circuit is connected to the control short circuit, and the other end is connected to the lower connector. The ball basket is located inside the lower connector, and the ball seat is located inside the central short circuit. The top of the ball seat is threaded to the main shaft of the track, and the bottom end has a mounting groove for placing the activation ball. The mounting groove has multiple elongated grooves circumferentially connected to the bottom end. A reserved groove is located inside the central short circuit. After the mounting groove moves to the reserved groove, the elongated grooves open, opening the mounting groove, and the activation ball falls into the ball basket.

[0015] By adopting the above technical solution, when scraping is required, an activation ball is inserted. The activation ball, through hydraulic lifting of the drill string, drives the ball seat downwards, which in turn moves the guide spindle downwards. At this time, the guide spindle sleeve rotates, and the trajectory control pin moves from the long track to the temporary track. When the ball seat descends to the release space at the predetermined midpoint, the activation ball is released. During this process, the ball seat return spring pushes the trajectory control pin from the temporary track into the short track. At this point, the pre-reserved flow hole on the openable inner spindle is activated, drill string fluid flows into the piston, pushing the piston to push the cutter block out of the casing. The scraper contacts and cleans the inner wall of the casing, and the activation ball falls into the ball basket. This allows for scraping without pulling out the drill string and changing the drill string assembly, greatly simplifying the operation process, shortening the operation time, and reducing costs. After the operation is completed, the activation ball is inserted again, and a similar process is repeated to close the flow hole, retract the cutter block into the casing, restore its original state, and prepare for the next scraping operation. The entire process is simple to operate, highly reliable, and effectively improves drilling efficiency and safety.

[0016] Preferably, it also includes a sealing device, including a first groove opened on the side of the long inner shaft sleeve corresponding to the housing, and a first sealing ring and a retaining ring are provided in the first groove to seal the outer wall of the long inner shaft sleeve and the inner wall of the housing;

[0017] It also includes a second groove inside the long inner shaft sleeve, two of which are formed along the length direction, and a first lip seal is provided inside the second groove to seal the wall of the long inner shaft sleeve to the outer wall of the switchable long inner shaft.

[0018] It also includes a third groove inside the piston, and a second lip seal is provided inside the third groove to form a seal with the switchable long inner shaft;

[0019] It also includes a fourth groove on the outside of the piston located inside the housing, a third lip seal is provided inside the fourth groove, and a seal is formed between the third lip seal and the inner wall of the housing;

[0020] It also includes a fifth groove on the outer side of the piston, a second sealing ring is provided inside the fifth groove, and a seal is formed between the second sealing ring and the inner wall of the drive ring.

[0021] It also includes two adjacent sixth grooves located on the inner wall of the main track shaft, which are sleeved on the inner side of the switchable long inner shaft. A fourth lip seal is provided in the sixth groove to seal the inner wall of the main track shaft with the outer wall of the switchable long inner shaft.

[0022] It also includes a seventh groove opened on the top inner wall of the control short circuit, two adjacent seventh grooves are opened, a third sealing ring is provided in the seventh groove, and a seal is formed between the third sealing ring and the outer wall of the track main shaft;

[0023] It also includes an eighth groove on the outer side of the locking block sleeve, a fourth sealing ring is provided in the eighth groove, and the fourth sealing ring seals the inner wall of the control short circuit.

[0024] It also includes a ninth groove on the outside of the locking block support sleeve and a tenth groove on the inside. A fifth sealing ring and a sixth sealing ring are respectively provided in the ninth groove and the tenth groove to form a seal between the locking block support sleeve and the locking block sleeve and the track main shaft.

[0025] By adopting the above technical solution and setting a sealing device, the overall sealing performance of the hydraulic pipe scraper while drilling is improved, which can effectively prevent leakage during drilling, ensure tight cooperation between various components, and improve the reliability and safety of the equipment.

[0026] Preferably, three receiving grooves are provided along the circumference of the housing, and three sets of scraping devices are provided along the circumference of the housing.

[0027] By adopting the above technical solution, three receiving slots and corresponding scraping devices are evenly distributed around the circumference of the casing, making the scraping operation more uniform and comprehensive, thus improving the working efficiency and cleaning effect of the pipe scraper. Specifically, the scraping component in each receiving slot can extend and retract synchronously under hydraulic pressure, ensuring maximum cleaning coverage of the entire inner wall of the casing and reducing problems caused by incomplete local cleaning. At the same time, the design of the three sets of scraping devices also enhances the stability and reliability of the pipe scraper, reducing the equipment failure rate.

[0028] Preferably, an elastic element is provided between the blade block and the scraper. The elastic element includes two types: a small spring and a disc spring. One end of the small spring abuts against the scraper and the other end abuts against the blade block. The disc spring is fixed to the scraper by a screw connection through a nail shaft.

[0029] By adopting the above technical solutions, the design of the small spring enables the scraper to produce appropriate elastic deformation when encountering dirt of different hardness, thereby better conforming to the inner wall of the sleeve and improving the scraping effect. The setting of the disc spring further enhances the elasticity and stability of the scraper, ensuring that it can maintain good scraping performance under high load and avoid damage caused by excessive force. The dual design of the elastic element (small spring and disc spring) not only improves the overall reliability of the scraping parts, but also automatically adjusts the pressure distribution under different working conditions, reduces wear, and extends service life.

[0030] Preferably, three small springs are evenly arranged along the length of the blade holder, and two disc springs are arranged between two of the small springs.

[0031] By adopting the above technical solution, the elastic element design between the blade and the scraper enables the scraper to effectively scrape the inner walls of sleeves with different diameters. Specifically, the combination of small springs and disc springs ensures that the scraper maintains good contact even when encountering significant resistance, thereby improving the scraping effect. Three small springs are evenly arranged along the length of the blade holder, ensuring balanced force and avoiding damage caused by excessive local pressure. The disc spring is positioned between two small springs, further enhancing elasticity and stability, allowing the scraper to maintain good adaptability and reliability under different working conditions.

[0032] Preferably, the switchable long inner shaft is provided with multiple flow holes evenly spaced circumferentially below the sixth groove. The flow holes are opened and closed by the movement of the main track shaft to control the liquid entering the piston.

[0033] By adopting the above technical solution, the flow orifice can be opened or closed in a timely manner when the main shaft of the track moves, thereby effectively controlling the pressure changes of the liquid entering the piston and ensuring that the piston can accurately push the blade block out of the housing when needed for effective pipe scraping. At the same time, this also avoids unnecessary liquid leakage and improves the reliability and efficiency of the system.

[0034] Preferably, the outer wall of the spherical basket is provided with multiple liquid inlet holes.

[0035] By adopting the above technical solution, the multiple liquid inlet holes set on the outer wall of the ball basket can effectively increase the liquid flow area, ensure that the liquid smoothly enters the ball basket, thereby accelerating the falling speed of the activation ball and improving the response speed and working efficiency of the scraper.

[0036] Preferably, the main shaft sleeve of the track has a continuous sliding track, including a long track and a temporary track. The control device is provided with a track control pin. The control short joint has a pin hole for the track control pin to pass through. The track control pin is fixedly installed inside the pin hole, and one end of the pin located inside the control short joint abuts against the sliding track. Two adjacent eleventh grooves are formed on the wall of the pin hole. A seventh sealing ring is installed in the eleventh groove, and the seventh sealing ring seals the track control pin with the pin hole. When the ball seat drives the main shaft of the track to move downward, the track control pin moves from the long track to the temporary track, and the main shaft sleeve will rotate, switching the track once each time.

[0037] By adopting the above technical solution, the track spindle sleeve rotates as the ball seat drives the track spindle downwards, ensuring that the position of the track spindle sleeve changes with each activation. This avoids track wear caused by repeated operations, improving the reliability and service life of the equipment. Simultaneously, the cooperation between the trajectory control pin and the continuous sliding track ensures accurate switching of the track spindle sleeve at different stages, guaranteeing the normal operation of the scraper. The seventh sealing ring effectively prevents hydraulic fluid leakage from the drill string, enhancing the equipment's sealing performance.

[0038] Preferably, the joint threads between the housing, the upper connector, the control short circuit, the intermediate short circuit, and the lower connector are treated with carbonitriding.

[0039] By adopting the above technical solution, the joint threads are treated with carbonitriding, which significantly improves the surface hardness and wear resistance of the joint threads, extends the service life of the joint, reduces the risk of connection loosening due to wear, and ensures the stability and reliability of the drilling hydraulic scraper under high load and long-term operation conditions.

[0040] Secondly, this application provides a method for using a hydraulic pipe scraper while drilling, comprising the following steps:

[0041] Step 1: Connect the hydraulic scraper to the wellhead while drilling;

[0042] Step 2: During the drilling operation of the hydraulic pipe scraper, the fluid reaches the lower part of the drill bit through the switchable inner long shaft and the track spindle;

[0043] Step 3: When scraping is required, the activation ball is inserted and the drill string is hydraulically raised to drive the ball seat downward. The ball seat is threaded to the track spindle at the tail. During the downward movement of the ball seat, the track spindle moves downward together. At this time, the track spindle sleeve will rotate. The trajectory control pin moves from the long track to the temporary track. When the ball seat descends to the release space in the middle of the predetermined position, the activation ball is released. At this time, under the push of the ball seat return spring, the trajectory control pin will move from the temporary track to the short track. At this time, the flow hole reserved in the switchable long inner shaft will be activated, the drill string fluid flows into the piston, and pushes the piston cutter block out of the housing. At this time, the scraper needs to clean the inner wall of the casing, and the activation ball falls into the ball basket.

[0044] Step 4: Pull the drill string up or down to begin the pipe scraping operation;

[0045] Step 5, you can also rotate the drill bit for rotary scraping;

[0046] Step Six: After the operation is completed, the activation ball is put back into the hydraulic system of the drill string to raise the activation ball and drive the ball seat downward. The tail of the ball seat is threaded to the main shaft of the track. During the downward movement of the ball seat, the main shaft of the track moves downward together. At this time, the main shaft sleeve will rotate. The trajectory control pin moves from the short track to the temporary track. When the ball seat descends to the release space in the middle of the predetermined position, the activation ball is released. At this time, under the push of the ball seat return spring, the trajectory control pin will move from the temporary track to the long track. At this time, the flow hole reserved in the switchable long inner shaft will be closed, the activation ball falls into the ball basket, and the drill string fluid passes through the tool body. Under the action of the return spring, the cutting block is retracted into the housing.

[0047] Step seven requires reactivating the cleaning of the pipe wall and repeating steps two through six.

[0048] Step 8: Remove the wellhead while drilling to complete the operation.

[0049] By adopting the above technical solution, the method of using the hydraulic scraper while drilling includes the following steps: First, the hydraulic scraper is connected to the wellhead while drilling, simplifying the operation process and reducing preparation time; Second, during the operation of the hydraulic scraper while drilling, the fluid can reach the lower part of the drill bit through the switchable inner long shaft and the track spindle, ensuring the normal circulation of drilling fluid and maintaining the smooth progress of drilling operations; Third, by deploying the activation ball, the drill string is hydraulically raised to drive the ball seat downward, causing the track spindle sleeve to rotate, ultimately opening the flow hole, allowing the drill string fluid to flow into the piston, pushing the piston to push the cutter block out of the housing, and the scraper to contact the inner wall of the casing that needs to be cleaned, realizing the rapid start of the scraping operation; Fourth, the drill string is pulled up or down to start the scraping operation, which can be flexibly adjusted. The position and range of the scraper enhance its flexibility; the fifth step involves rotating the drill string for scraping, further improving efficiency and cleaning effectiveness; the sixth step, after completion, re-engages the activation ball, closing the flow orifice through the same mechanism, allowing drill fluid to flow through the tool body, and the cutter blocks retract into the housing under the action of the return spring, completing the recovery after the scraping operation and preparing for the next scraping; the seventh step, when reactivating the cleaning of the pipe wall is required, steps two through six are repeated, ensuring the continuity and reliability of multiple scraping operations; the eighth step involves retrieving the wellhead while drilling, completing the entire operation process and ensuring the safe recovery of the equipment and preparation for its next use; this allows for scraping operations without tripping the drill string during drilling operations, significantly improving drilling efficiency and reducing operating costs.

[0050] In summary, this application includes at least one of the following beneficial technical effects:

[0051] When scraping is required, an activation ball is deployed. The activation ball, lifted by hydraulic pressure from the drill string, lowers the ball seat, which in turn moves the guide spindle downwards. During this movement, the guide spindle sleeve rotates, and the trajectory control pin moves from the long track to the temporary track. When the ball seat reaches the release space at the predetermined midpoint, the activation ball is released. In this process, the ball seat return spring pushes the trajectory control pin from the temporary track into the short track. At this point, the pre-reserved flow hole on the openable inner spindle is activated, allowing drill string fluid to flow into the piston, pushing the piston to eject the cutter block from the casing. The scraper contacts and cleans the inner wall of the casing, and the activation ball falls into the ball basket. This allows for scraping without tripping the drill string and changing the drill string assembly, greatly simplifying the operation, shortening the operation time, and reducing costs. After the operation is completed, the activation ball is deployed again, and a similar process is repeated to close the flow hole, retract the cutter block into the casing, and restore the original state, ready for the next scraping operation. The entire process is simple to operate, highly reliable, and effectively improves drilling efficiency and safety.

[0052] The design of the piston and drive components allows the scraper to automatically extend the cutting blocks for scraping operations under the hydraulic pressure of the drill string, eliminating the need for additional tripping and changing of drill string assemblies, simplifying the operation process and reducing drilling costs;

[0053] The cutting blocks and scrapers in the scraping device are connected by elastic elements, which can automatically adjust their position when encountering obstacles, reducing the risk of drill jamming and improving the safety and effectiveness of pipe scraping operations. Attached Figure Description

[0054] Figure 1 This is a schematic diagram of a hydraulic pipe scraper used in drilling, as described in this application.

[0055] Figure 2 This is an exploded view of this application.

[0056] Figure 3 This is a cross-sectional view of this application.

[0057] Figure 4 yes Figure 3 A magnified view of part A.

[0058] Figure 5 yes Figure 3 A magnified view of section B.

[0059] Figure 6 yes Figure 3 A magnified view of a portion of point C.

[0060] Figure 7 yes Figure 3 A magnified view of a portion of point D.

[0061] Explanation of reference numerals in the attached drawings: 1. Upper connector; 2. Housing; 3. Reset device; 31. Long inner shaft sleeve; 32. Switchable long inner shaft; 321. Flow hole; 33. Spring sleeve; 34. Reset spring; 35. Spring ring; 36. Spring guide block; 4. Scraping device; 41. Receiving groove; 411. Slide groove; 42. Scraper; 421. Blade block; 4211. Slider; 422. Scraper; 423. Blade block baffle; 424. Elastic element; 4241. Small spring; 424 2. Disc spring; 4243. Nail shaft; 5. Pushing device; 51. Piston; 52. Driving component; 521. Driving ring; 522. Driving block; 53. Outer sleeve; 6. Control device; 61. Control short circuit; 62. Track spindle; 621. Bearing; 622. Baffle; 623. Bearing retaining ring; 63. Track spindle sleeve; 631. Continuous sliding track; 6311. Long track; 6312. Temporary track; 64. Ball seat return spring; 65. Locking block sleeve; 651 652. Groove key; 66. Lock block support sleeve; 67. Track control pin; 671. Eleventh groove; 672. Seventh sealing ring; 7. Activation device; 71. Intermediate short connector; 711. Reserved groove; 72. Ball seat; 721. Mounting groove; 7211. Long groove; 73. Activation ball; 74. Ball basket; 741. Liquid inlet; 75. Lower connector; 8. Sealing device; 81. First groove; 811. First sealing ring; 812. Retaining ring; 82. Second groove ; 821, First lip seal; 83, Third groove; 831, Second lip seal; 84, Fourth groove; 841, Third lip seal; 85, Fifth groove; 851, Second sealing ring; 86, Sixth groove; 861, Fourth lip seal; 87, Seventh groove; 871, Third sealing ring; 88, Eighth groove; 881, Fourth sealing ring; 89, Ninth groove; 891, Fifth sealing ring; 810, Tenth groove; 8101, Sixth sealing ring. Detailed Implementation

[0062] The following is in conjunction with the appendix Figure 1-7 This application will be described in further detail.

[0063] This application discloses a hydraulic pipe scraper used while drilling. (Refer to...) Figure 1-3The hydraulic pipe scraper for drilling includes an upper connector 1, a housing 2, a reset device 3, a scraping device 4, a pushing device 5, a control device 6, an activation device 7, and a sealing device 8. The upper connector 1 connects to the drilling rig. The housing 2 is threadedly connected to the top of the upper connector 1. The reset device 3 is located inside the housing 2. The scraping device 4 is located at the bottom of the reset device 3. The pushing device 5 is located at the bottom of the scraping device 4. The control device 6 is located at the bottom of the pushing device 5. The activation device 7 is located at the bottom of the control device 6. Through its rational structural design and precise fit, the entire device achieves efficient pipe scraping operations while drilling, effectively solving the problems of poor flexibility and low operating efficiency of traditional mechanical pipe scrapers in complex downhole environments.

[0064] Reference Figure 2 , Figure 4 Specifically, the reset device 3 includes a long inner shaft sleeve 31, a switchable long inner shaft 32, a spring sleeve 33, a reset spring 34, a spring ring 35, and a spring guide block 36. The long inner shaft sleeve 31 is disposed inside the housing 2 and is fixed to the inside of the housing 2 via a threaded connection. The switchable long inner shaft 32 is disposed inside the long inner shaft sleeve 31 and is threaded to the inner wall of the long inner shaft sleeve 31, extending towards the bottom of the housing 2. The spring sleeve 33 is disposed inside the housing 2 and is threaded to the inside of the housing 2, located at the bottom end of the long inner shaft sleeve 31. The top end of the spring sleeve 33 abuts against the bottom end of the long inner shaft sleeve 31, and the reset spring 34 is disposed inside it. The bottom end of the reset spring 34 abuts against the spring ring 35. The spring guide block 36 is fixed to the spring ring 35 by screws and is sleeved on the outside of the bottom end of the reset spring 34. This design allows the reset device 3 to quickly reset when needed, ensuring the reliability and stability of the scraper.

[0065] Reference Figure 2 , Figure 5 The scraping device 4 includes a receiving groove 41 evenly spaced circumferentially on the housing 2 and a scraping component 42 disposed within the receiving groove 41. The scraping component 42 includes a cutting block 421, a scraper 422 disposed outside the cutting block 421, and a cutting block baffle 423 that fixes the scraper 422 to the cutting block 421. Specifically, a groove for mounting the scraper 422 is provided on one side of the cutting block 421, with one end open and a limiting plate at the other end to prevent the scraper 422 from falling off. The cutting block baffle 423 is designed as an L-shaped limiting plate. The cutting block baffle 423 is installed after the scraper 422 is installed to prevent the scraper 422 from falling off. An inclined groove 411 is formed on the side wall of the receiving groove 41. The groove 411 faces upward near the outer wall of the housing 2 and downward away from the outer wall of the housing 2. A slider 4211 corresponding to the groove 411 is provided on the side of the blade block 421. By moving the groove 411 and the slider 4211 relative to each other, the blade block 421 can be controlled to move towards or away from the central axis of the housing 2. This design allows the scraper 42 to be flexibly adjusted in position as needed, thereby cleaning the inner wall of the sleeve more effectively.

[0066] An elastic element 424 is also provided between the blade block 421 and the scraper 422. The elastic element 424 includes two types: a small spring 4241 and a disc spring 4242. A slot is provided on the blade block 421 for placing the elastic element 424, facilitating its placement. One end of the small spring 4241 abuts against the scraper 422, and the other end abuts against the blade block 421. The disc spring 4242 is fixed to the scraper 422 via a screw shaft 4243 through a threaded connection. Three small springs 4241 are evenly arranged along the length of the blade holder, and two disc springs 4242 are arranged between two small springs 4241. This design makes the scraper 42 more gentle when it contacts the inner wall of the sleeve, reducing damage to the inner wall of the sleeve and improving the quality of the scraping operation.

[0067] By incorporating an elastic element 424 between the cutter block 421 and the scraper 422, the scraper 42 makes its contact with the inner wall of the casing more gentle, reducing damage to the inner wall and improving the quality of the scraping operation. Specifically, the design of the small spring 4241 and the disc spring 4242 provides a certain degree of buffering when the scraper 42 contacts the inner wall of the casing, avoiding damage caused by hard contact, thereby improving the safety and reliability of the scraping operation. This design is particularly suitable for the complex geological conditions of deep and ultra-deep wells, and can effectively improve the quality and efficiency of the scraping operation.

[0068] Reference Figure 2 , Figure 6 The pushing device 5 includes a piston 51, a driving member 52, and an outer sleeve 53. The piston 51 is sleeved on the outside of the switchable long inner shaft 32. The driving member 52 is sleeved on the top of the outer side of the piston 51 and includes a driving ring 521 and a driving block 522. The driving ring 521 is threadedly connected to the piston 51, and the driving block 522 is threadedly connected to the driving ring 521 and is located within the receiving groove 41. The top of the outer sleeve 53 abuts against the bottom of the piston 51 and is threadedly connected to the housing 2. This design allows the pushing device 5 to precisely control the movement of the piston 51, thereby enabling the extension and retraction of the scraper 42.

[0069] Reference Figure 2 , Figure 7The control device 6 includes a control short circuit 61, a track spindle 62, a track spindle 62 sleeve, a ball seat 72 return spring 64, a locking block sleeve 65, and a locking block support sleeve 66. The control short circuit 61 is threaded to the bottom of the housing 2. The track spindle 62 is located inside the control short circuit 61, with its top sleeved on the outside of the switchable long inner shaft 32. The inner wall of the top of the control short circuit 61 fits against the outer wall of the track spindle 62. The track spindle 62 sleeve is fitted onto the outside of the track spindle 62, with bearings 621 abutting at both ends. A baffle 622 is provided on the track spindle 62, abutting against the bottom of the bearing 621 at the bottom of the track spindle 62 sleeve. A bearing 621 retaining ring is provided on the top of the bearing 621 at the top of the track spindle 62 sleeve, and the bearing 621 retaining ring is detachably connected to the track spindle 62 by circumferentially installed screws. The ball seat 72 return spring 64 is located at the bottom of the baffle 622, with its other end abutting against the locking block sleeve 65. The locking block sleeve 65 has a circumferentially formed slot 651, and the control short circuit 61 has a corresponding hole inside the slot 651. A key 652 is provided inside the slot 651 and connects to the control short circuit 61 through the key 652. The locking block support sleeve 66 is set inside the locking block sleeve 65 by a threaded connection. This design allows the control device 6 to precisely control the movement of the track spindle 62, thereby realizing the flexible start and stop of the scraper.

[0070] A continuous sliding track 631, including a long track 6311 and a temporary track 6312, is provided on the main shaft 62. A track control pin 67 is provided on the control device 6. A pin hole is provided on the control short connector 61 for the track control pin 67 to pass through. The track control pin 67 is fixedly installed inside the pin hole, and one end of the pin 67 located inside the control short connector 61 abuts against the sliding track. Two adjacent eleventh grooves 671 are provided on the wall of the pin hole. A seventh sealing ring 672 is installed in the eleventh groove 671, and the seventh sealing ring 672 seals the track control pin 67 with the pin hole. When the ball seat 72 drives the main shaft 62 to move downward, the track control pin 67 moves from the long track 6311 to the temporary track 6312, and the main shaft 62 rotates, activating a track switch each time. Through the cooperation of the track control pin 67 and the continuous sliding track 631, the accurate switching of the main shaft 62 at different stages is ensured, guaranteeing the normal operation of the scraper.

[0071] Reference Figure 2 , Figure 3The activation device 7 includes an intermediate short circuit 71, a ball seat 72, an activation ball 73, a ball basket 74, and a lower connector 75. One end of the intermediate short circuit 71 is connected to the control short circuit 61, and the other end is connected to the lower connector 75. The ball basket 74 is located inside the lower connector 75, and the ball seat 72 is located inside the intermediate short circuit 71. The top of the ball seat 72 is threaded to the main shaft 62 of the track, and the bottom end has an installation groove 721 for placing the activation ball 73. The installation groove 721 has multiple elongated grooves 7211 that communicate with the bottom end. The intermediate short circuit 71 has a reserved groove 711 inside. After the installation groove 721 moves to the reserved groove 711, the elongated grooves 7211 open, opening the installation groove 721, and the activation ball 73 falls into the ball basket 74. This design allows the activation device 7 to easily control the deployment and retrieval of the activation ball 73, thereby realizing the rapid start-up and reset of the scraper.

[0072] Reference Figures 4-7The sealing device 8 includes multiple sealing rings and retaining rings 812, which are respectively disposed in different locations. A first sealing ring 811 and a retaining ring 812 are disposed in a first groove 81 on the side of the long inner shaft sleeve 31 corresponding to the housing 2, sealing the outer wall of the long inner shaft sleeve 31 with the inner wall of the housing 2. Two second grooves 82 are formed along the length of the long inner shaft sleeve 31, and a first lip seal 821 is disposed in the second groove 82, sealing the wall of the long inner shaft sleeve 31 with the outer wall of the switchable long inner shaft 32. A second lip seal 831 is disposed in a third groove 83 inside the piston 51, forming a seal with the switchable long inner shaft 32. A third lip seal 841 is disposed in a fourth groove 84 outside the piston 51, forming a seal with the inner wall of the housing 2. A second sealing ring 851 is disposed in a fifth groove 85 outside the piston 51, forming a seal with the inner wall of the drive ring 521. A fourth lip seal 861 is installed in two adjacent sixth grooves 86 on the inner side of the switchable long inner shaft 32, sealing the inner wall of the main track shaft 62 with the outer wall of the switchable long inner shaft 32. Two adjacent seventh grooves 87 are opened on the top inner wall of the control short circuit 61, and a third sealing ring 871 is installed in the seventh groove 87, forming a seal between the third sealing ring 871 and the outer wall of the main track shaft 62. A fourth sealing ring 881 is installed in the eighth groove 88 on the outer side of the locking block sleeve 65, sealing the inner wall of the control short circuit 61 with the fourth sealing ring 881. A fifth sealing ring 891 is installed in the ninth groove 89 on the outer side of the locking block support sleeve 66, and a sixth sealing ring 8101 is installed in the tenth groove 810 on the inner side, respectively, forming a seal between the locking block support sleeve 66 and the locking block sleeve 65 and the main track shaft 62. By adding sealing devices 8, the sealing performance of the scraper is further improved, preventing downhole fluid leakage and ensuring the reliability and safety of the scraper. Specifically, the design of each sealing ring and retaining ring 812 ensures a tighter seal between components, preventing liquid leakage under high pressure and thus guaranteeing the smooth operation of the scraper. This design not only improves the working efficiency of the scraper but also extends its service life, making it particularly suitable for complex geological conditions in deep and ultra-deep wells.

[0073] The implementation principle of a hydraulic casing scraper according to an embodiment of this application is as follows: When casing scraping is required, an activation ball 73 is inserted. The activation ball 73, through hydraulic lifting of the drill string, drives the ball seat 72 downward, thereby driving the track spindle 62 downward as well. At this time, the track spindle 62 rotates, and the trajectory control pin 67 moves from the long track 6311 to the temporary track 6312. When the ball seat 72 descends to the release space of the intermediate short circuit 71 at the predetermined position, the activation ball 73 is released. During this process, the return spring 64 of the ball seat 72 pushes the trajectory control pin 67 from the temporary track 6312 into the short track. At this time, the flow hole 321 reserved in the switchable long inner spindle 32 is activated, and the drill string fluid flows into the piston 51, pushing the piston 51 to push the cutter block 421 out of the housing 2. The scraper 422 contacts and cleans the inner wall of the casing, and the activation ball 73 falls into the ball basket. In this way, casing scraping can be achieved without pulling out the drill string and changing the drill string assembly, greatly simplifying the operation process, shortening the operation time, and reducing costs. After the operation is completed, the activation ball 73 is put back in, and a similar process is repeated to close the flow hole 321, retract the cutter block 421 into the casing 2, restore it to its original state, and prepare for the next pipe scraping operation. The whole process is simple to operate, highly reliable, and effectively improves drilling efficiency and safety.

[0074] This application also discloses a method for using a hydraulic pipe scraper while drilling. (Refer to...) Figure 2 The method of using a hydraulic pipe scraper while drilling includes the following steps:

[0075] Step 1: Connect the hydraulic scraper to the wellhead while drilling;

[0076] Step 2: During the drilling operation of the hydraulic scraper, the fluid reaches the lower part of the drill bit through the switchable inner long shaft and the track spindle 62;

[0077] Step 3: When scraping is required, the activation ball 73 is inserted and the drill string is hydraulically raised to drive the ball seat 72 downward. The ball seat 72 is threaded to the track spindle 62 at its tail. During the downward movement of the ball seat 72, the track spindle 62 moves downward together. At this time, the track spindle 62 will rotate. The trajectory control pin 67 moves from the long track 6311 to the temporary track 6312. When the ball seat 72 descends to the release space of the intermediate short circuit 71 at the predetermined position, the activation ball 73 is released. At this time, under the push of the ball seat 72 return spring 64, the trajectory control pin 67 will move from the temporary track 6312 to the short track. At this time, the flow hole 321 reserved in the switchable long inner shaft 32 will be activated. The drill string fluid flows into the piston 51, pushing the piston 51 cutter block 421 out of the housing 2. At this time, the scraper 422 contacts the inner wall of the casing to be cleaned, and the activation ball 73 falls into the ball basket.

[0078] Step 4: Pull the drill string up or down to begin the pipe scraping operation;

[0079] Step 5, you can also rotate the drill bit for rotary scraping;

[0080] Step 6: After the operation is completed, the activation ball 73 is put back into the hydraulic system of the drill string to raise the activation ball 73 and drive the ball seat 72 downward. The tail of the ball seat 72 is threadedly connected to the track spindle 62. During the downward movement of the ball seat 72, the track spindle 62 moves downward together. At this time, the track spindle 62 will rotate. The trajectory control pin 67 moves from the short track to the temporary track 6312. When the ball seat 72 moves to the release space of the intermediate short circuit 71 at the predetermined position, the activation ball 73 is released. At this time, under the push of the ball seat 72 return spring 64, the trajectory control pin 67 will move from the temporary track 6312 to the long track 6311. At this time, the flow hole 321 reserved in the switchable long inner shaft 32 will be closed. The activation ball 73 falls into the ball basket. The drill string fluid passes through the tool body and the cutter block 421 is retracted into the housing 2 under the action of the return spring 34.

[0081] Step seven requires reactivating the cleaning of the pipe wall and repeating steps two through six.

[0082] Step 8: Remove the wellhead while drilling to complete the operation.

[0083] The implementation principle of the method of using a hydraulic scraper while drilling according to an embodiment of this application is as follows: The method of using a hydraulic scraper while drilling includes the following steps: First, the hydraulic scraper is connected to the wellhead while drilling, which simplifies the operation process and reduces preparation time; Second, during the operation of the hydraulic scraper while drilling, the fluid can reach the lower part of the drill bit through the switchable inner long shaft and the track spindle 62, ensuring the normal circulation of drilling fluid and maintaining the smooth progress of drilling operations; Third, by deploying the activation ball 73, the drill string is hydraulically raised to drive the ball seat 72 downward, causing the track spindle 62 to rotate, ultimately opening the flow hole 321, allowing the drill string fluid to flow into the piston 51, pushing the piston 51 to push the cutter block 421 out of the housing 2, and the scraper 422 to contact the inner wall of the casing that needs to be cleaned, realizing the rapid start of the scraping operation; Fourth, pull up or down The process begins with lifting the drill string to initiate the scraping operation. The position and range of the scraping can be flexibly adjusted, enhancing its flexibility. The fifth step involves rotating the drill string for rotary scraping, further improving efficiency and cleaning effectiveness. The sixth step, after completion, re-engages the activation ball 73, closing the flow orifice 321 via the same mechanism. Drill string fluid flows through the tool body, and under the action of the return spring 34, the cutter block 421 retracts into the housing 2, completing the recovery process after the scraping operation and preparing for the next operation. The seventh step, when reactivating the cleaning of the pipe wall, repeats steps two through six, ensuring the continuity and reliability of multiple scraping operations. The eighth step involves retrieving the wellhead while drilling, completing the entire operation and ensuring safe equipment recovery and preparation for future use. This allows for scraping operations without tripping the drill string during drilling, significantly improving drilling efficiency and reducing operating costs. The above are preferred embodiments of this application and are not intended to limit the scope of protection of this application. Therefore, all equivalent changes made to the structure, shape, and principle of this application should be included within the scope of protection of this application.

Claims

1. A hydraulic pipe scraper used while drilling, characterized in that: include: Upper connector (1), which is connected to the drilling rig; The housing (2) has its top end threadedly connected to the upper connector (1); The reset device (3) is disposed inside the housing (2) and includes a long inner shaft sleeve (31) and a switchable long inner shaft (32). The long inner shaft sleeve (31) is threadedly connected to the housing (2). The switchable long inner shaft (32) is disposed inside the long inner shaft sleeve (31) and is threadedly connected to the inner wall of the long inner shaft sleeve (31), and extends toward the bottom of the housing (2). The scraping device (4) is located inside the housing (2) at the bottom of the reset device (3). The pushing device (5) is located inside the housing (2) at the bottom of the scraping device (4), and includes a piston (51) which is sleeved on the outside of the switchable long inner shaft (32). The control device (6) includes a control short circuit (61), a track spindle (62), a track spindle sleeve (63), a ball seat return spring (64), a locking block sleeve (65), and a locking block support sleeve (66). The control short circuit (61) is threadedly connected to the bottom of the housing (2). The track spindle (62) is located inside the control short circuit (61), and its top is sleeved on the outside of the switchable long inner shaft (32). The top inner wall of the control short circuit (61) fits against the outer wall of the track spindle (62). The track spindle sleeve is sleeved on the outside of the track spindle (62). An activation device (7) is located at the bottom of the control device (6) and includes an intermediate short circuit (71), a ball seat (72), an activation ball (73), and a ball basket (74). One end of the intermediate short circuit (71) is connected to the control short circuit (61), and the other end is connected to the lower connector (75). The ball basket (74) is located inside the lower connector (75), and the ball seat (72) is located inside the intermediate short circuit (71). The top of the ball seat (72) is connected to the main shaft of the track. (62) Threaded connection, with an installation groove (721) for placing the activation ball (73) at the bottom. The installation groove (721) has multiple elongated grooves (7211) that communicate with the bottom in the circumferential direction. The intermediate short connector (71) has a reserved groove (711) inside. After the installation groove (721) moves to the reserved groove (711), the elongated grooves (7211) open up. When the installation groove (721) is opened, the activation ball (73) falls into the ball basket (74).

2. The hydraulic pipe scraper according to claim 1, characterized in that: It also includes a sealing device (8), including a first groove (81) opened on the side of the long inner shaft sleeve (31) corresponding to the housing (2), and a first sealing ring (811) and a retaining ring (812) are provided in the first groove (81) to seal the outer wall of the long inner shaft sleeve (31) and the inner wall of the housing (2). It also includes a second groove (82) opened inside the long inner shaft sleeve (31), two of the second grooves (82) are opened along the length direction, and a first lip seal (821) is provided inside the second groove (82) to seal the wall of the long inner shaft sleeve (31) with the outer wall of the switchable long inner shaft (32); It also includes a third groove (83) inside the piston (51), and a second lip seal (831) is provided inside the third groove (83) to form a seal with the switchable long inner shaft (32); It also includes a fourth groove (84) on the outside of the piston (51) located inside the housing (2), and a third lip seal (841) is provided inside the fourth groove (84), and a seal is formed between the third lip seal (841) and the inner wall of the housing (2); It also includes a fifth groove (85) opened on the outside of the piston (51), a second sealing ring (851) is provided inside the fifth groove (85), and a seal is formed between the second sealing ring (851) and the inner wall of the drive member (52) sleeved on the top of the outside of the piston (51); It also includes two adjacent sixth grooves (86) that are sleeved on the inner side of the switchable long inner shaft (32) and located on the inner wall of the main shaft of the track (62). A fourth lip seal (861) is provided in the sixth groove (86) to seal the inner wall of the main shaft of the track (62) with the outer wall of the switchable long inner shaft (32). It also includes a seventh groove (87) opened on the top inner wall of the control short circuit (61), two adjacent seventh grooves (87) are opened, a third sealing ring (871) is provided in the seventh groove (87), and a seal is formed between the third sealing ring (871) and the outer wall of the track main shaft (62); It also includes an eighth groove (88) opened on the outside of the locking block sleeve (65), a fourth sealing ring (881) is provided in the eighth groove (88), and the fourth sealing ring (881) seals the inner wall of the control short circuit (61); It also includes a ninth groove (89) on the outside of the locking block support sleeve (66) and a tenth groove (810) on the inside. A fifth sealing ring (891) and a sixth sealing ring (8101) are respectively provided in the ninth groove (89) and the tenth groove (810) to form a seal between the locking block support sleeve (66) and the locking block sleeve (65) and the track spindle (62).

3. The hydraulic pipe scraper according to claim 1, characterized in that: The scraping device (4) includes accommodating grooves (41) evenly opened on the housing (2) in the circumferential direction; three accommodating grooves (41) are opened in the circumferential direction of the housing (2), and three sets of scraping devices (4) are arranged in the circumferential direction of the housing (2).

4. The hydraulic pipe scraper according to claim 3, characterized in that: The scraping device (4) includes a scraping component (42) disposed in the receiving groove (41). The scraping component (42) includes a blade (421) and a scraper (422) disposed outside the blade (421). An elastic element (424) is also disposed between the blade (421) and the scraper (422). The elastic element (424) includes two types: a small spring (4241) and a disc spring (4242). One end of the small spring (4241) abuts against the scraper (422), and the other end abuts against the blade (421). The disc spring (4242) is fixed to the scraper (422) by a screw connection through a nail shaft (4243).

5. The hydraulic pipe scraper according to claim 2, characterized in that: The inner side of the switchable long inner shaft (32) is fitted with two adjacent sixth grooves (86) on the inner wall of the main track shaft (62). The switchable long inner shaft (32) is located below the sixth groove (86) and has multiple flow holes (321) evenly distributed around its circumference. The flow holes (321) are opened and closed by the movement of the main track shaft (62) to control the liquid to enter the piston (51).

6. The hydraulic pipe scraper according to claim 1, characterized in that: The outer wall of the ball basket (74) is provided with multiple liquid inlet holes (741).

7. The hydraulic pipe scraper according to claim 1, characterized in that: The main shaft (62) of the track is fitted with a continuous sliding track (631), including a long track (6311) and a temporary track (6312). The control device (6) is equipped with a track control pin (67). The control short connector (61) is provided with a pin hole for the track control pin (67) to pass through. The track control pin (67) is fixedly installed inside the pin hole, and one end of the pin located inside the control short connector (61) abuts against the sliding track. Two adjacent eleventh grooves (671) are provided on the wall of the pin hole. A seventh sealing ring (672) is installed in the eleventh groove (671). The seventh sealing ring (672) seals the track control pin (67) with the pin hole. When the ball seat (72) drives the main shaft (62) to move downward, the track control pin (67) moves from the long track (6311) to the temporary track (6312). The main shaft (62) of the track will rotate, and the track will be switched once each time it is activated.

8. The hydraulic pipe scraper according to claim 1, characterized in that: The joint threads between the housing (2), the upper connector (1), the control short circuit (61), the intermediate short circuit (71), and the lower connector (75) are treated with carbonitriding.

9. A method of using a hydraulic pipe scraper while drilling, employing any one of the hydraulic pipe scrapers described in claims 1-8, characterized in that: Includes the following steps: Step 1: Connect the hydraulic scraper to the wellhead while drilling; Step 2: During the drilling operation of the hydraulic scraper, the fluid reaches the lower part of the drill bit through the switchable inner long shaft and the track spindle (62); Step 3: When scraping is required, the activation ball (73) is inserted and the drill string is hydraulically raised to drive the ball seat (72) downward. The tail of the ball seat (72) is threadedly connected to the track spindle (62). During the downward movement of the ball seat (72), the track spindle (62) moves downward together. At this time, the track spindle (62) sleeve will rotate. The trajectory control pin (67) moves from the long track (6311) to the temporary track (6312). When the ball seat (72) descends to the middle short connector (7... When the space is released, the activation ball (73) is released. At this time, under the push of the return spring (64) of the ball seat (72), the trajectory control pin (67) will move from the temporary track (6312) into the short track. At this time, the flow hole (321) reserved in the switchable long inner shaft (32) will be activated, the drill fluid flows into the piston (51), and pushes the piston (51) and the cutter block (421) to be pushed out of the housing (2). At this time, the scraper (422) contacts the inner wall of the casing that needs to be cleaned, and the activation ball (73) falls into the ball basket. Step 4: Pull the drill string up or down to begin the pipe scraping operation; Step 5, you can also rotate the drill bit for rotary scraping; Step Six: After the operation is completed, the activation ball (73) is put back into the hydraulic system of the drill string to raise the activation ball (73) and drive the ball seat (72) downward. The tail of the ball seat (72) is threadedly connected to the track spindle (62). During the downward movement of the ball seat (72), the track spindle (62) moves downward together. At this time, the track spindle (62) sleeve will rotate. The trajectory control pin (67) moves from the short track to the temporary track (6312). When the ball seat (72) moves to the middle short track... When the release space of (71) is reached, the activation ball (73) is released. At this time, under the push of the return spring (64) of the ball seat (72), the trajectory control pin (67) will move from the temporary track (6312) into the long track (6311). At this time, the flow hole (321) reserved in the switchable long inner shaft (32) will be closed, the activation ball (73) falls into the ball basket, and the drill fluid passes through the tool body. Under the action of the return spring (34), the cutting block (421) retracts into the housing (2). Step seven requires reactivating the cleaning of the pipe wall and repeating steps two through six. Step 8: Remove the wellhead while drilling to complete the operation.

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