Activation type pipe scraper

Abstract

The utility model discloses an activated pipe scraper which comprises a pipe scraper main body, a plurality of scraper mounting grooves and a plurality of scraper blades, the sliding sleeve is arranged in the pipe scraper body in an axial sliding mode, and a strip-shaped groove corresponding to the through hole is formed in the sliding sleeve. The scraper is arranged in the scraper mounting groove in a sliding manner; the lock pin is fixed on the bottom surface of the scraper, and the front end of the lock pin extends into the strip-shaped groove; the pressure spring is elastically pressed between the scraper and the bottom of the mounting groove; and a ball seat clamped with the steel ball is arranged in the sliding sleeve. According to the pipe scraper, the sliding sleeve axially slides towards one side on the pipe scraper body, the clamping part of the sliding sleeve can be separated from the annular clamping groove of the lock pin, the limiting state is unlocked, the scraper can be opened under the elastic force action of the compression spring, and the pipe scraper is automatically activated; meanwhile, along with downward movement of the sliding sleeve, the first row of circulating holes and the second row of circulating holes enter the circulating cavity, so that drilling fluid can be normally circulated, and normal pipe scraping operation can be achieved. The design structure is ingenious, operation is convenient, and trouble and labor are saved.

Description

Technical Field

[0001] The utility model relates to the field of tools for clearing obstacles of casing attachments, in particular to an activated pipe scraper. Background Art

[0002] The main purpose of the scraper is to remove cement, sand, residual shrapnel, scratches, paraffin, burrs and other attachments from the inner wall of the downhole casing to ensure the cleanliness of the inner wall of the casing, so as to facilitate the normal operation of the required drilling tools. It is one of the indispensable auxiliary tools for completion, testing and downhole operations. Because the existing scraper is usually in an open state before entering the well, its maximum installation size is larger than the inner diameter of the casing to be cleaned, which leads to restrictions on its entry, rotation, and return of cuttings; it cannot even remove the casing shoe, which limits the scope of use of drilling and scraping in one trip. Utility Model Content

[0003] Based on this, the utility model provides an activated pipe scraper to solve the problems of slow lowering and limited use of existing pipe scrapers while drilling. The tool can replace the traditional pipe scraper for single pipe scraping operation and has a faster lowering speed; it can also be lowered while drilling, and the scraping operation can be completed in one trip without affecting the drilling operation, thereby saving the time and cost of a single trip of scraping.

[0004] To achieve the above object, the utility model provides an activated pipe scraper, which comprises:

[0005] The scraper body is a tubular structure, and a plurality of scraper installation grooves are provided on its outer wall, and a through hole is provided at the bottom of the scraper installation groove;

[0006] A sliding sleeve is axially slidably disposed in the scraper body, the sliding sleeve is provided with a strip groove corresponding to the through hole, and the opening width of one end of the strip groove is narrowed to form a clamping portion;

[0007] A scraper is slidably arranged in the scraper installation groove along the radial direction of the scraper body, and each scraper installation groove is correspondingly installed with one scraper;

[0008] A locking pin is fixed to the bottom surface of the scraper along the radial direction of the scraper body, the front end of the locking pin passes through the through hole and extends to the strip groove, and the front end of the locking pin is provided with an annular groove engaged with the engaging portion;

[0009] A compression spring elastically compressed between the bottom surface of the scraper and the bottom of the scraper mounting groove; and

[0010] The steel ball can be transported into the inner cavity of the sleeve along an external pipeline connected to the scraper. The inner cavity of the sleeve is narrowed to form a ball seat that is snap-fitted with the arc surface of the steel ball. When the steel ball falls on the ball seat, the inner cavity of the sleeve is sealed.

[0011] As a further preferred technical solution of the utility model, adjacent scraper installation grooves in the axial direction of the scraper body are spaced and staggered.

[0012] As a further preferred technical solution of the utility model, three scraper installation grooves are arranged at intervals in the same circumferential direction of the scraper body.

[0013] As a further preferred technical solution of the present utility model, the locking pin is connected to the scraper via threads, and the compression spring is sleeved on the locking pin.

[0014] As a further preferred technical solution of the utility model, the scraper is provided with mounting holes at both ends of the axial direction of the scraper body, and balls are placed in the mounting holes. Part of the balls protrude from the mounting holes and are in sliding contact with the groove wall of the scraper mounting groove.

[0015] As a further preferred technical solution of the utility model, the scraper is provided with a stop pin which is inserted into the mounting hole and contacts the ball, and the stop pin is used to limit the ball in the mounting hole.

[0016] As a further preferred technical solution of the utility model, a shear pin is installed on the scraper body by means of radially arranged screws, and a shear hole is opened on the outer wall of the sleeve. When the scraper is locked on the scraper body by means of a locking pin and a sleeve in a compressed state, the front end of the shear pin is inserted into the shear hole; when the sleeve slides in the scraper body under external force, the front end of the shear pin can be sheared off through the shear hole.

[0017] As a further preferred technical solution of the utility model, a first row of circulation holes and a second row of circulation holes are respectively opened on the tube wall of the sleeve along the circumference of the tube wall, and the first row of circulation holes and the second row of circulation holes are respectively arranged at the upper and lower parts of the ball seat position; a circulation cavity with an inner diameter larger than the outer diameter of the sleeve is provided in the scraper body, and when the scraper is locked on the scraper body by the locking pin and the sleeve in a compressed state, the first row of circulation holes and / or the second row of circulation holes are not located in the circulation cavity; when the scraper is unlocked by the locking pin and the sleeve and spread on the scraper body, the first row of circulation holes and the second row of circulation holes are located in the circulation cavity.

[0018] As a further preferred technical solution of the utility model, a sealing ring located on the sliding sleeve is provided between the first row of circulation holes and the second row of circulation holes. When the first row of circulation holes and / or the second row of circulation holes are not located in the circulation chamber, the outer wall of the sliding sleeve is sealed to the inner wall of the scraper body through the sealing ring.

[0019] As a further preferred technical solution of the utility model, one end of the scraper body is provided with a female buckle with an internal thread, and the other end is provided with a male buckle with an external thread.

[0020] The activated pipe scraper of the utility model adopts the above technical solution to achieve the following beneficial effects:

[0021] 1) The utility model can limit the scraper in a compressed state by cooperating the clamping part of the sliding sleeve with the annular clamping groove of the locking pin, so that the scraper can be smoothly sent into the casing to be cleaned; when the scraper is not activated (the scraper is not opened), it can be used as an ordinary drilling centralizer without affecting the normal drilling operation; while in the traditional technology, the scraper cannot be used as an ordinary drilling centralizer, and it needs to be sent into the wellbore slowly and separately after the drilling operation is completed, which is time-consuming and labor-intensive, with low efficiency and high operation cost;

[0022] 2) The utility model allows the sliding sleeve to slide axially to one side on the scraper body, so that the clamping part of the sliding sleeve can be disengaged from the annular clamping groove of the lock pin, unlocking the limit state, and the scraper can be opened under the elastic force of the compression spring, so as to realize automatic activation of the scraper, which has a clever structure, convenient operation, and saves trouble and labor;

[0023] 3) The utility model drops a steel ball into the drill bit on the ground, and under the action of gravity and the thrust generated by the circulating drilling fluid, the steel ball reaches the ball seat in the tool, and continues to press the shear pin of the shear limit sleeve. The sleeve slides axially downward relative to the scraper body under the action of the drilling fluid pressure, thereby achieving the disengagement and unlocking of the sleeve's clamping part and the annular groove of the locking pin, and the scraper pops out of the scraper body under the action of the spring force to achieve activation. At the same time, as the sleeve moves downward, the first row of circulation holes and the second row of circulation holes enter the circulation chamber, so that the drilling fluid can circulate normally. In this way, the drill bit can be moved up and down to make the scraper scrape the casing, and at the same time, the debris generated by the scraper is taken out of the wellbore through the circulation of the drilling fluid, so that the scraper can perform normal scraping operations after activation. The structure is ingenious, the operation is convenient, and it saves trouble and labor. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] The utility model is further described in detail below in conjunction with the accompanying drawings and specific implementation methods.

[0025] Figure 1Schematic diagram of the structure of the active scraper, wherein, for different positions of the sliding sleeve on the scraper body, the position where the sliding sleeve locks the scraper is indicated by a dotted line, and the position where the sliding sleeve unlocks the scraper is indicated by a solid line;

[0026] Figure 2 for Figure 1 A first partial enlarged view of the middle-activated scraper, in which K indicates the installation direction of the scraper in the scraper installation groove when the compression spring is compressed, and H is a schematic diagram of the engagement state of the clamping portion of the sliding sleeve and the annular clamping groove of the locking pin when the sliding sleeve locks the scraper;

[0027] Figure 3 for Figure 1 A second partial enlarged view of the middle activated scraper;

[0028] Figure 4 for Figure 1 AA section view of the mid-activated scraper;

[0029] Figure 5 It is a partial development diagram of the outer diameter surface of the scraper body;

[0030] Figure 6 This is a partial view of the strip groove portion provided on the sliding sleeve.

[0031] In the figure: 1. scraper body; 2. steel ball; 3. sliding sleeve; 4. sealing ring; 5. compression spring; 6. scraper; 7. locking pin; 8. stop pin; 9. ball; 10. shear pin; 11. screw; 12. strip groove; 13. first row of circulation holes; 14. second row of circulation holes; 15. circulation cavity; 16. ball seat; 17. shear hole.

[0032] The purpose, features and advantages of the present invention will be further described in conjunction with the embodiments and with reference to the accompanying drawings. DETAILED DESCRIPTION

[0033] The present invention will be further described below in conjunction with the accompanying drawings and specific implementation methods. The terms such as "upper", "lower", "left", "right", "middle" and "one" used in the preferred embodiments are only used to facilitate the description, and are not used to limit the scope of the implementation of the present invention. The changes or adjustments in their relative relationships shall also be regarded as the scope of the implementation of the present invention without substantially changing the technical content.

[0034] like Figure 1-6 As shown, the utility model provides an activated pipe scraper, comprising:

[0035] The scraper body 1 is a tubular structure, and a plurality of scraper installation grooves are provided on its outer wall. Three scraper installation grooves are arranged at intervals in the same circumferential direction of the scraper body 1, and the scraper installation grooves adjacent to each other in the axial direction of the scraper body 1 are arranged at intervals and staggered; two through holes are provided at the bottom of each scraper installation groove; a female buckle is provided at one end of the scraper body 1, and a male buckle is provided at the other end, so that the scraper body 1 can be connected with other pipes or tools, or multiple scraper bodies 1 can be cascaded, etc.; a spiral guide groove is provided on the outer wall of the scraper body 1 to avoid the scraper installation groove, so that the circulating drilling fluid can flow along the guide groove on the outside of the scraper body 1 during operation;

[0036] The sliding sleeve 3 is axially slidably disposed in the scraper body 1. The sliding sleeve 3 is provided with strip grooves 12 corresponding to the through holes. Each through hole corresponds to a strip groove 12. The opening width of one end of the strip groove 12 is narrowed to form a clamping portion. The clamping portions of all the strip grooves 12 are located at the same end.

[0037] The scraper 6 is slidably arranged in the scraper installation groove along the radial direction of the scraper body 1, and each scraper installation groove is correspondingly installed with a scraper 6; the scraper 6 is an integral structure, and the overall strength and surface hardness required for scraping the sleeve are achieved through material selection, forging, machining, heat treatment, carbonitriding and other surface treatments;

[0038] The locking pin 7 is fixed to the bottom surface of the scraper 6 by threaded connection along the radial direction of the scraper body 1. Each scraper 6 corresponds to two locking pins 7. The front end of the locking pin 7 passes through the through hole at the bottom of the scraper installation groove and extends into the strip groove 12. The front end of the locking pin 7 is provided with an annular groove engaged with the engaging portion.

[0039] A compression spring 5 is elastically pressed between the bottom surface of the scraper 6 and the bottom of the scraper installation groove and sleeved on the locking pin 7. The compression spring 5 is used to provide elastic force to push the scraper 6 outward relative to the scraper body 1; and

[0040] The steel ball 2 can be transported into the inner cavity of the sleeve 3 along an external pipeline connected to the scraper. The inner cavity diameter of the sleeve 3 is narrowed to form a ball seat 16 that is snap-fitted with the arc surface of the steel ball 2. When the steel ball 2 falls on the ball seat 16, the inner cavity of the sleeve 3 is sealed.

[0041] As a functional section of the drilling tool, the active scraper is connected to other pipe bodies through the scraper body 1. Before and during the process of going down the well, the lock pin 7 is engaged with the strip groove 12 of the sleeve 3 to lock and fix the scraper 6 in the compressed state in the scraper installation groove of the scraper body 1. When the active scraper is required to work, the steel ball 2 is put into the drilling pipe body and enters the sleeve 3 under the operation of gravity and the thrust of the drilling fluid circulation. When the steel ball 2 falls on the ball seat 16, the inner cavity of the sleeve 3 is sealed. At this time, the circulating drilling fluid exerts pressure on the steel ball 2 to induce the sleeve 3 to move to one side, so that the lock pin 7 moves to the end with a larger opening of the strip groove 12, and the lock pin 7 is unlocked from the strip groove 12 of the sleeve 3. At this time, the scraper 6 is ejected from the scraper installation groove by the elastic force of the compression spring, that is, the scraper 6 is in a stretched state in the scraper body 1. By axially moving the active scraper, the pipe wall of the well can be scraped and washed.

[0042] Since the steel ball 2 falls on the ball seat 16 to seal the inner cavity of the sleeve 3, the circulating drilling fluid cannot continue to circulate. In order to solve this problem, the following structure is also set. The tube wall of the sleeve 3 is respectively provided with a first row of circulation holes 13 and a second row of circulation holes 14 along the circumference of the tube wall, and the first row of circulation holes 13 and the second row of circulation holes 14 are respectively provided at the upper and lower parts of the ball seat 16; the scraper body 1 is provided with a circulation cavity 15 whose inner diameter is larger than the outer diameter of the sleeve, and when the scraper is locked on the scraper body by the locking pin and the sleeve in a compressed state, the first row of circulation holes 13 and the second row of circulation holes 14 are not located in the circulation cavity 15; when the scraper is unlocked by the locking pin and the sleeve and is stretched on the scraper body, the first row of circulation holes 13 and the second row of circulation holes 14 are located in the circulation cavity 15. A sealing ring 4 is provided on the sleeve between the first row of circulation holes 13 and the second row of circulation holes 14. When the first row of circulation holes and / or the second row of circulation holes are not located in the circulation cavity 15, the outer wall of the sleeve is sealed with the inner wall of the scraper body through the sealing ring 4. Therefore, when the steel ball 2 seals the inner cavity of the sleeve 3, the two ends of the sleeve 3 are connected through the first row of circulation holes 13 and the second row of circulation holes 14 which are both in the circulation cavity 15, so that the conductive path of the circulating drilling fluid bypasses the steel ball 2 and continues to circulate, thereby ensuring the normal operation of other parts of the drilling rig pipe body without being affected.

[0043] The scraper body is provided with a shear pin 10 which is compressed and installed by a radially arranged screw 11, and a shear hole 17 is provided on the outer wall of the sleeve. When the scraper 6 is locked on the scraper body by the locking pin and the sleeve in a compressed state, the front end of the shear pin 10 is inserted into the shear hole 17, thereby fixing the sleeve 3 and the scraper body 1 relatively; when the sleeve 3 slides in the scraper body 1 under an external force, the front end of the shear pin 10 can be sheared off through the shear hole 17. That is, when the scraper 6 is locked on the scraper body 1 in a compressed state, in order to prevent the sleeve 3 from sliding in the scraper body 1 and unlocking the scraper 6, the shear pin 10 is designed to be plugged and matched with the shear hole 17 for fixing. Furthermore, the force exerted on a single shear pin 10 is limited. In order to allow the shear pin to be sheared only under a certain thrust, a plurality of shear pin mounting holes can be provided on the scraper body. Each shear pin mounting hole can be installed with a shear pin 10. In actual application, shear pins of a certain data are placed according to the required thrust (corresponding to the pressure of the drilling fluid, that is, the pump pressure required to be applied on the ground). The shear pin mounting holes where the shear pins 10 are not placed are still blocked with screws 11.

[0044] The method of using the activated scraper of this embodiment is as follows:

[0045] 1) Before the scraper is lowered into the well, ensure that the scraper 6 is in a compressed state; that is, after the scraper 6 compresses the compression spring 5 under the action of external force, it is connected to the annular groove of the locking pin 7 through the clamping part of the sliding sleeve 3, so that the scraper 6 is limited in a compressed state, and then the sliding sleeve 3 is fixed by the shear pin 10. The number of shear pins 10 to be installed is selected according to demand.

[0046] 2) After the scraper is lowered into the well, no steel ball is put in, and the scraper is in an inactive state. At this time, the scraper can be used as an ordinary drilling centralizer, can enter and exit the casing shoe, and can also enter the open hole section with the drill bit without affecting the normal drilling operation.

[0047] 3) When the drilling operation is completed and scraping and cleaning operations are required, the scraper reaches the casing section to be scraped and cleaned, and the steel ball 2 (or other round balls that match the ball seat) is put into the drill pipe. The circulating drilling fluid drives the steel ball 2 to be located on the ball seat in the sleeve 3 and presses against it; the pressure is continued to be slowly pressed, so that when the pump pressure increases, the downward force of the sleeve 3 is greater than the shear force borne by the shear pin 10, thereby pushing the sleeve 3 to cut the shear pin 10. At the same time, the clamping part of the sleeve 3 is disengaged from the annular clamping groove of the lock pin 7, and the sleeve 3 no longer restricts the lock pin 7. The scraper 6 is stretched outward under the action of the compression spring 5, that is, the scraper 6 is activated and the scraping and cleaning operation can begin. Since the adjacent scraper installation grooves in the axial direction of the scraper body are spaced and staggered, the scraper can move axially in the casing to be cleaned, and a 360° scraping effect can be achieved.

[0048] 4) After the shear pin 10 is cut off, so that the sliding sleeve 3 moves down to the limit step, the first row of circulation holes 13 and the second row of circulation holes 14 above and below the ball seat 16 enter the circulation chamber 15 on the scraper body 1, and the circulating drilling fluid can enter the circulation chamber 15 from the first row of circulation holes 13 above the steel ball, and then flow out of the circulation chamber 15 from the second row of circulation holes 14 below the steel ball, thereby realizing the circulation of the drilling fluid. In this way, various debris (iron filings, sundries, etc.) generated by scraping the casing can be carried out of the scraped casing as the drilling fluid circulates.

[0049] In a specific embodiment, in order to reduce the friction of the scraper 6 sliding in the scraper installation groove, the scraper 6 slides more smoothly. To this end, the scraper 6 is provided with mounting holes at both ends of the axial direction of the scraper body 1, and balls 9 are placed in the mounting holes. Parts of the balls 9 protrude from the mounting holes and slide in contact with the groove wall of the scraper installation groove. Preferably, the scraper 6 is provided with a stop pin 8 inserted into the mounting hole and in contact with the balls 9, and the stop pin 8 is used to limit the balls 9 in the mounting hole.

[0050] Although specific embodiments of the present invention are described above, those skilled in the art should understand that these are merely examples and that various changes or modifications may be made to the embodiments without departing from the principles and essence of the present invention. The scope of protection of the present invention is limited only by the appended claims.

Claims

1. An activated scraper, characterized in that: include: The scraper body is a tubular structure, and a plurality of scraper installation grooves are provided on its outer wall, and a through hole is provided at the bottom of the scraper installation groove; A sliding sleeve is axially slidably disposed in the scraper body, the sliding sleeve is provided with a strip groove corresponding to the through hole, and the opening width of one end of the strip groove is narrowed to form a clamping portion; A scraper is slidably arranged in the scraper installation groove along the radial direction of the scraper body, and each scraper installation groove is correspondingly installed with one scraper; A locking pin is fixed to the bottom surface of the scraper along the radial direction of the scraper body, the front end of the locking pin passes through the through hole and extends into the strip groove, and the front end of the locking pin is provided with an annular groove engaged with the engaging portion; A compression spring elastically compressed between the bottom surface of the scraper and the bottom of the scraper mounting groove; and The steel ball can be transported into the inner cavity of the sleeve along an external pipeline connected to the scraper. The inner cavity of the sleeve is narrowed to form a ball seat that is snap-fitted with the arc surface of the steel ball. When the steel ball falls on the ball seat, the inner cavity of the sleeve is sealed.

2. The active scraper according to claim 1, characterized in that: The scraper installation grooves adjacent to each other in the axial direction of the scraper body are spaced apart and staggered.

3. The active scraper according to claim 1, characterized in that: The scraper installation grooves are provided with three at intervals in the same circumferential direction of the scraper body.

4. The active pipe scraper according to claim 1, characterized in that: The locking pin is connected to the scraper through threads, and the compression spring is sleeved on the locking pin.

5. The active pipe scraper according to claim 1, characterized in that: The scraper is provided with mounting holes at both ends of the axial direction of the scraper body, and balls are placed in the mounting holes. Parts of the balls protrude from the mounting holes and are in sliding contact with the groove wall of the scraper mounting groove.

6. The active pipe scraper according to claim 5, characterized in that: The scraper is provided with a stop pin which is inserted into the mounting hole and contacts the ball, and the stop pin is used to limit the ball in the mounting hole.

7. The active pipe scraper according to claim 1, characterized in that: A shear pin is installed on the scraper body by means of radially arranged screws, and a shear hole is opened on the outer wall of the sleeve. When the scraper is locked on the scraper body by means of the locking pin and the sleeve in a compressed state, the front end of the shear pin is inserted into the shear hole; when the sleeve slides in the scraper body under external force, the front end of the shear pin can be sheared off through the shear hole.

8. The activated pipe scraper according to any one of claims 1 to 7, characterized in that: The tube wall of the sleeve is provided with a first row of circulation holes and a second row of circulation holes along the circumference of the tube wall, and the first row of circulation holes and the second row of circulation holes are respectively provided at the upper and lower parts of the ball seat; a circulation cavity with an inner diameter larger than the outer diameter of the sleeve is provided in the scraper body, and when the scraper is locked on the scraper body by the locking pin and the sleeve in a compressed state, the first row of circulation holes and / or the second row of circulation holes are not located in the circulation cavity; When the scraper is unlocked by the cooperation of the locking pin and the sliding sleeve and is spread open on the scraper body, the first row of circulation holes and the second row of circulation holes are located in the circulation chamber.

9. The active pipe scraper according to claim 8, characterized in that: A sealing ring located on the sliding sleeve is provided between the first row of circulation holes and the second row of circulation holes. When the first row of circulation holes and / or the second row of circulation holes are not located in the circulation chamber, the outer wall of the sliding sleeve is sealed with the inner wall of the scraper body through the sealing ring.

10. The active pipe scraper according to claim 9, characterized in that: One end of the scraper body is provided with a female buckle with an internal thread, and the other end is provided with a male buckle with an external thread.

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