Mud scraping disc and mud scraping device

Abstract

The invention belongs to the technical field of petroleum drilling, and particularly relates to a mud scraping disc and a mud scraping device. The mud scraping disc is an elastic spiral mud scraping disc which surrounds the periphery of the drill rod by at least one circle; the mud scraping disc comprises supporting rings and mud scraping rings, and the supporting rings are spirally stacked in sequence; the outer rings of the mud scraping rings are connected with the inner rings of the supporting rings, the inner rings of the mud scraping rings are attached to the peripheral face of the drill rod, the thickness of the mud scraping rings is smaller than that of the supporting rings, and gaps are reserved between the mud scraping rings in the axial direction. The mud scraping disc is used for solving the problems that the mud scraping disc is not thorough in scraping and inconvenient to install. The spiral mud scraping disc surrounds the periphery of the drill rod, the mud scraping disc forms a whole, the supporting rings are arranged in a stacked mode to guarantee that each circle is pressed, the mud scraping rings can be attached to the surface of the drill rod, and therefore the mud scraping disc is not prone to inclining and overturning compared with a split type U-shaped mud scraping disc, and the mud scraping effect is better.

Description

TECHNICAL FIELD

[0001] The application belongs to the technical field of oil drilling, and particularly relates to a mud scraping disc and a mud scraping device. BACKGROUND

[0002] In the process of tripping in oil drilling engineering, the drill pipe taken out from the well has a large amount of mud, and the mud has strong adhesion, which will seriously affect the operation of drilling engineering, safety production and clean and civilized production if not removed.

[0003] For a long time, two drilling workers have been needed to use a simple mud scraping strip to scrape mud during the tripping process of drilling, which increases the safety risks such as skid and falling objects, and also increases the labor intensity of workers. Therefore, this problem has not been solved, and many manufacturers have produced various mud scraping devices, such as U-shaped opening type mud scraping discs and swinging type mud scraping discs. However, all of them have problems such as not being able to scrape clean, complex structure, difficult installation, inconvenient replacement of mud scraping discs and the like. SUMMARY

[0004] In view of the deficiencies of the prior art, a mud scraping disc and a mud scraping device are provided to solve the problems of not being able to scrape clean and inconvenient installation of the mud scraping disc.

[0005] The technical scheme for solving the above technical problems is as follows: a mud scraping disc, the mud scraping disc is an elastic mud scraping disc which is wrapped around the outer periphery of the drill pipe for at least one turn; The mud scraping disc comprises: a support ring, the support ring is spirally stacked; a mud scraping ring, the outer ring of the mud scraping ring is connected with the inner ring of the support ring, the inner ring of the mud scraping ring is attached to the outer periphery of the drill pipe, the thickness of the mud scraping ring is smaller than that of the support ring, and the mud scraping rings have gaps in the axial direction.

[0006] Compared with the prior art, the above technical scheme has the following beneficial effects: The spiral mud scraping disc is wrapped around the outer periphery of the drill pipe, the mud scraping disc forms an integral whole, the stacked support ring ensures that each turn is pressed tightly, the mud scraping ring can be attached to the surface of the drill pipe, and the mud scraping rings have certain gap spaces, so that the mud scraping ring can have certain deformation displacement space, the mud scraping disc is not easy to tilt and overturn compared with the split U-shaped mud scraping disc, the mud scraping effect is better, the whole has elasticity, and it can be adapted to different sizes of drilling tools. Moreover, compared with the U-shaped mud scraping disc which needs to be installed with a tilting mechanism and the like, the spiral mud scraping disc only needs to be stretched like a stretched spring, the gap of the stretched mud scraping disc is clamped on the drill pipe, and then the mud scraping disc is screwed in, so that the installation is extremely convenient.

[0007] On the basis of the above technical scheme, the embodiments of the present application can also be improved as follows: In an embodiment, a helical spring is arranged in the support ring along the helical direction thereof.

[0008] In an embodiment, the inner edge of the mud scraping ring on the side away from the well is arranged radially outwardly inclined.

[0009] The inner ring of the mud scraping ring is arranged to be inclined, which can play a guiding role, and the inclined surface facilitates upwardly passing over the coupling of the drill rod and facilitates downwardly scraping mud.

[0010] In an embodiment, a convex edge is arranged on the inner edge of the mud scraping ring on the side away from the well.

[0011] The embodiment of the present application also discloses a mud scraping device, which comprises: a mud scraping disc as described above; a rack, the bottom of which is provided with a bottom plate for supporting the mud scraping disc, and the bottom plate is provided with a through hole for the drill to pass through; a plurality of block assemblies, which are arranged at intervals in the circumferential direction of the mud scraping disc, and the block assemblies and the bottom plate respectively clamp the end faces of the mud scraping disc; a plurality of fastening assemblies arranged on the inner wall of the rack for connecting and fixing the slips.

[0012] In an embodiment, the block assembly comprises: a mandrel arranged on the bottom plate at the outer periphery of the mud scraping disc, and the mandrel is provided with a step; a bearing member sleeved on the mandrel, and the bearing member is positioned in abutment with the end face of the step; a block, the first end of which is sleeved on the mandrel, and the second end is used for contacting the end of the mud scraping disc away from the bottom plate; two half rings, the mandrel is provided with a clamping groove on the side away from the bearing member, and the two half rings are oppositely clamped in the clamping groove for limiting the block; a fixing disc sleeved on the mandrel, and the fixing disc is provided with a stepped groove sleeved on the end face and the outer peripheral face of the half ring; a first clamping spring clamped and fixed on the mandrel, and the first clamping spring is located on the side away from the half ring of the fixing disc.

[0013] In an embodiment, a first positioning device and a second positioning device are respectively arranged corresponding to the working position and the non-working position of the block assembly; when the block is rotated to the working position in which the second end of the block is located above the mud scraping disc, the side surface of the block is in contact with the first positioning device for positioning; when the block is rotated to the non-working position in which the second end of the block is located away from above the mud scraping disc, the side surface of the block is in contact with the second positioning device for positioning.

[0014] In an embodiment, the first positioning device is consistent with the second positioning device in structure. The first positioning device comprises: A post, which is provided with a through hole on a side surface thereof at a same height as the stopper and away from the stopper; A magnetic member, which is arranged in the through hole and used for adsorbing the stopper attached to the post; A first fastener, which is screwed into the through hole and used for abutting and fixing the magnetic member; The first positioning device further comprises a second fastener, which is screwed into the bottom plate in a direction perpendicular to the first fastener, and a top of the second fastener after being fastened in place is higher than the second fastener, and is used for limiting the first fastener from loosening and sliding out.

[0015] In an embodiment, the fastening assembly comprises: A fixing sleeve, which is arranged in the rack and is provided with a stepped hole at an end close to the bottom plate; A third fastener, which is matched to extend into the stepped hole from the bottom plate, and an end of the third fastener extends out of the fixing sleeve and is used for being connected and fixed with the slip; A second snap spring, which is matched to be fixed on an inner wall of the stepped hole and is used for limiting the third fastener from sliding out.

[0016] In an embodiment, the stopper is provided with an ear close to a side of the mud scraping disc on a second end thereof when the stopper is in a non-working position; The rack is provided with a notch on a side thereof, and the notch is connected to the through hole on the bottom plate.

[0017] The one or more technical solutions provided in the embodiments have at least the following technical effects or advantages: 1. The lower mud scraping function can keep the power slip jaw clean for a long time. When the mud is scraped, the mud cannot reach the jaw position, which avoids the problem that the jaw is covered with mud and causes the slip to slip, improves the working reliability of the slip, and ensures the safety of drilling.

[0018] 2. The self-adaptive mud scraping function of the drilling assembly. The spiral spring in the spiral scraping disc ensures that the scraping disc can still be attached to the surface of the drilling assembly when the diameter of the drilling assembly changes, has the mud scraping function, and can realize self-adaptive mud scraping of two to three kinds of drilling assemblies without replacing the scraping disc.

[0019] 3. The device has positioning and releasing functions. When the baffle is in the working position, i.e. can block the upward movement of the spiral scraper, the upward positioning is realized; the rack can block the downward movement of the spiral scraper, the downward positioning is realized. When the baffle is in the open state, i.e. in the non-working position, the spiral scraper can be moved upward with the drill collar, so that the spiral scraper is removed from the drill pipe on the drilling platform, the spiral scraper is convenient to install and disassemble, and the drilling efficiency is improved.

[0020] 4. The scraper is in a floating state in the rack, and can move radially with the drill pipe without damaging the drill pipe.

[0021] 5. The baffle has a position stabilizing function. Each baffle is positioned by two groups of strong magnets, so that the baffle has certain constraint force in the working position and the non-working position, the position of the baffle is stable, and the continuous and reliable scraping function is ensured.

[0022] 6. Anti-falling design of parts. A second fastener is arranged at the tail end of the first fastener to prevent the first fastener from sliding out and prevent the positioning device from failing, and a second snap spring is arranged at the bottom of the third fastener to prevent the third fastener from sliding out, and the whole has an anti-falling design. BRIEF DESCRIPTION OF DRAWINGS

[0023] In order to more clearly illustrate the specific embodiments of the present application or the technical solutions in the prior art, the drawings needed in the specific embodiments or the prior art description will be briefly introduced below. Obviously, the drawings in the following description are some embodiments of the present application, and those skilled in the art can also obtain other drawings according to these drawings without creative labor.

[0024] Figure 1 It is a structural schematic diagram of the scraper in the present application.

[0025] Figure 2 It is a structural schematic diagram of the whole mud scraping device in the present application.

[0026] Figure 3 It is a structural schematic diagram of the baffle in the present application. Figure 2

[0027] Figure 4 It is a structural schematic diagram of the baffle in the present application. Figure 3

[0028] Figure 5 It is a structural schematic diagram of the baffle in the present application.

[0029] Figure 6 It is a structural schematic diagram of the baffle in the present application.

[0030] Figure 7 ​​This is a partial exploded structural diagram of the sludge scraping device in this invention.

[0031] Figure label: 1. Sludge scraper; 2. Frame; 3. Through hole; 4. Stop block assembly; 5. Fastening assembly; 6. Slot; 7. First positioning device; 8. Second positioning device; 9. Earring; 10. Notch; 11. Base plate; 101. Support ring; 102. Scraper ring; 103. Gap; 104. Helical spring; 105. Protruding edge; 401. Mandrel; 402. Step; 403. Bearing housing; 404. Thrust ball bearing; 405. Stop block; 406. Half ring; 407. Fixed plate; 408. Step groove; 409. First snap ring; 410. Sliding sleeve; 411. Oil injection hole; 412. Grease nipple; 501. Fixing sleeve; 502. Stepped hole; 503. Third fastener; 504. Second retaining ring; 701, Post; 702, Hole; 703, Magnetic component; 704, First fastener; 705, Second fastener; 706, Boss. Detailed Implementation

[0032] The embodiments of the technical solution of the present invention will now be described in detail with reference to the accompanying drawings. These embodiments are merely illustrative of the technical solution of the present invention and are therefore intended to limit the scope of protection of the present invention. It should be noted that, unless otherwise stated, the technical or scientific terms used in this application should have the ordinary meaning as understood by one of ordinary skill in the art to which this invention pertains.

[0033] In the description of this application, it should be understood that the terms "upper", "lower", "front", "rear", "left", "right", "top", "bottom", "inner", "outer", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limiting the present invention.

[0034] Furthermore, the terms "first," "second," etc., are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. In the description of this invention, "a plurality of" means two or more, unless otherwise explicitly defined.

[0035] In this application, unless otherwise expressly specified and limited, the terms "installation," "connection," "linking," and "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components. Those skilled in the art can understand the specific meaning of the above terms in this invention according to the specific circumstances.

[0036] Example 1 like Figure 1 , 2 As shown in Figure 6, the present invention provides a mud scraper 1, which is an elastic mud scraper 1 that wraps around the outer circumference of the drill rod at least once. The mud scraper 1 is formed into a spiral mud scraper 1 that wraps around the drill rod and is elastic, so that the mud scraper 1 can be tightly wrapped around drill rods of different diameters. Installation is also relatively convenient. Simply pull out the spiral mud scraper 1, wrap one end of the spiral mud scraper 1 around the drill rod, and then rotate the mud scraper 1 to wrap the entire mud scraper 1 around the drill rod.

[0037] Specifically, the sludge scraper 1 includes a support ring 101 and a sludge scraper ring 102.

[0038] The support rings 101 are spirally stacked, and the mud scraper rings 102 are disposed on the inner ring of the support rings 101. The outer ring of the mud scraper rings 102 is connected to the inner ring of the support rings 101. Specifically, the mud scraper rings 102 can be integrally formed with the support rings 101. The inner ring of the mud scraper rings 102 fits against the outer circumferential surface of the drill rod. The thickness of the mud scraper rings 102 is less than that of the support rings 101. Adjacent mud scraper rings 102 are axially spaced with a gap 103 to provide space for deformation of the mud scraper rings 102.

[0039] A spiral mud scraper 1 is wrapped around the outside of the drill pipe, forming a whole. The multi-ring spiral mud scraper 1 can repeatedly scrape the mud off the drill bit, ensuring the mud scraping effect. Moreover, the mud scraper 1 is a whole, which makes it less prone to tilting and flipping compared to a split U-shaped one, resulting in a better mud scraping effect. The support rings 101 are stacked to ensure that each ring is pressed tightly, ensuring the overall stability of the mud scraper 1. The mud scraper rings 102 can fit against the surface of the drill pipe, and there is a certain gap 103 between the mud scraper rings 102, which allows the mud scraper rings 102 to generate a certain deformation displacement space. The mud scraper 1 as a whole is elastic, which allows it to be adapted to drill bits of different sizes.

[0040] like Figure 6As shown, in order to strengthen the spiral scraper disc 1, a spiral spring 104 is provided in the support ring 101 along its spiral direction. The spiral spring 104 can provide elasticity in both the radial and axial directions, ensuring that the scraper disc 1 can be tightly clamped to the drill rod.

[0041] In this embodiment, the inner edge of the mud scraper ring 102 on the side away from the drilling is radially inclined outward, as shown in the figure. The upper edge of the inner ring of the mud scraper ring 102 is inclined outward, making the inner ring of the mud scraper ring 102 an inclined surface. Setting the inner ring of the mud scraper ring 102 to be inclined enables it to play a guiding role. Since the diameter of the drill pipe coupling is larger than the drill pipe itself, the inclined surface of the inner ring of the mud scraper ring 102 makes it easy to pass over the drill pipe coupling upward, and at the same time, it makes it easy to tightly hold the drill pipe when scraping mud downward.

[0042] The inner edge of the mud scraper ring 102 away from the drilling side is provided with a raised edge 105. The raised edge 105 can increase the bending resistance and elasticity of the inner ring, making the mud scraper 1 more adaptable to diameter changes.

[0043] Example 2 like Figures 2-7 As shown in the figure, the present invention also discloses a sludge scraping device, which includes: a sludge scraping disc 1, a frame 2, a plurality of stop block assemblies 4, and a plurality of fastening assemblies 5 as in embodiment 1.

[0044] The frame 2 is used to fix the bottom of the slip, and the frame 2 provides space for configuring components such as the scraper disc 1 and the stop block assembly 4. The bottom of the frame 2 is provided with a base plate 11 for supporting the scraper disc 1. The base plate 11 has a through hole 3 for the drill bit to pass through. The diameter of the through hole 3 is larger than that of the drill rod to ensure that the drill rod will not come into contact with or collide with the base plate 11 when it shakes during operation.

[0045] Three baffle assemblies 4 are provided, which are spaced apart along the circumference of the sludge scraper 1 and are located on the outer periphery of the sludge scraper 1. The baffle assemblies 4 and the base plate 11 respectively clamp the two end faces of the sludge scraper 1. The baffle assemblies 4 restrict the sludge scraper 1 from moving upward, and the base plate 11 restricts the sludge scraper 1 from moving downward, thus clamping the two end faces of the sludge scraper 1. like Figure 6 As shown, to facilitate clamping and fixing the scraper disc 1, the upper and lower end faces of the scraper disc 1 are set as planes.

[0046] Multiple fastening components 5 are disposed on the inner wall of the frame 2 for connection and fixation with the slips; The top opening of the frame 2 is connected to the bottom of the clamp by multiple fasteners. The frame 2, together with the clamp, encloses the interior of the frame 2.

[0047] Specifically, such as Figure 6 , 7As shown, the stop assembly 4 includes: a spindle 401, a bearing component, a stop 405, two half rings 406, and a fixing plate 407.

[0048] The mandrel 401 is disposed on the base plate 11 on the outer periphery of the scraper disc 1. A step 402 is provided on the mandrel 401. A bearing is sleeved on the mandrel 401. The bearing is positioned in contact with the end face of the step 402. The height of the bearing is positioned by the step 402. The bearing components include a bearing housing 403 and a thrust ball bearing 404. The bottom of the bearing housing 403 is attached to the end face of the step 402. The inner ring of the thrust ball bearing 404 is sleeved on the spindle 401, and the outer ring is restricted by the bearing housing 403. The two rings of the thrust ball bearing 404 are in contact with the bearing housing 403 and the stop block 405, respectively.

[0049] The first end of the stop block 405 has a hole for fitting onto the spindle 401. The bottom of the first end of the stop block 405 contacts the thrust ball bearing 404, which facilitates the rotation of the stop block 405 on the spindle 401. Specifically, a positioning edge is formed around the spindle 401 on the bearing housing 403. The positioning edge is annular, and an annular groove matching the positioning edge is formed at the bottom of the first end of the stop block 405.

[0050] The second end of the stop block 405 is used to contact the end of the scraper disc 1 away from the base plate 11. When the stop block 405 rotates around the spindle 401, the second end of the stop block 405 can rotate to be above the scraper disc 1 to contact and restrict the scraper disc 1, or rotate to be above the scraper disc 1 away from it to allow the scraper disc 1 to be removed from the top opening of the frame 2.

[0051] A groove 6 is provided on the side of the stop block 405 away from the bearing component on the spindle 401. Specifically, the top of the spindle 401 extends out of the outer circumference of the stop block 405 and a groove 6 is formed. The two half rings 406 are engaged in the groove 6. The two half rings 406 can form a complete circle after being spliced ​​together and are engaged in the groove 6. The bottom of the two half rings 406 abuts against the top of the first end of the stop block 405 to restrict the stop block 405 and prevent the stop block 405 from sliding off the spindle 401. A fixed disc 407 is sleeved on the mandrel 401. The fixed disc 407 is annular, and a stepped groove 408 is formed on the fixed disc 407, which fits onto the end face and outer circumference of the half ring 406. The stepped groove 408 is located at the bottom of the fixed disc 407 and covers the top end face and outer circumference of the half ring 406. This prevents the two half rings 406 from separating outward. The depth of the stepped groove 408 is at least greater than half the height of the half ring 406, ensuring that the half ring 406 is securely fixed.

[0052] The first snap ring 409 is snapped and fixed on the spindle 401. The first snap ring 409 is located on the side of the fixed disk 407 away from the half ring 406. The first snap ring 409 is attached to the top surface of the fixed disk 407 to prevent the fixed disk 407 from sliding out of the top of the spindle 401.

[0053] Specifically, a sliding sleeve 410 is sleeved between the stop block 405 and the spindle 401. Specifically, the sliding sleeve 410 can be a graphite copper sleeve. The inner wall of the graphite copper sleeve is sleeved on the spindle 401, and the outer wall of the graphite copper sleeve is sleeved in the hole at the first end of the stop block 405. Meanwhile, the bottom surfaces of the two half rings 406 also contact the top surfaces of the sliding sleeve 410 and the stop block 405, thus confining the sliding sleeve 410 within them.

[0054] Meanwhile, the spindle 401 also has an oil injection hole 411 at its center, which is connected to the inner wall of the copper sleeve. A grease nipple 412 is connected to the oil injection hole 411.

[0055] To prevent the stop block 405 from rotating arbitrarily, a first positioning device 7 and a second positioning device 8 are respectively provided for the working position and the non-working position of the stop block assembly 4; In the working position, the stop block 405 in the stop block assembly 4 is rotated so that its second end points to the center of the scraper disc 1 and is located above the scraper disc 1. Specifically, the second end of the stop block 405 is opposite to the support ring 101 in the scraper disc 1, and together with the bottom plate 11, restricts the vertical movement of the scraper disc 1. In the non-working position, the stop block 405 in the stop block assembly 4 is rotated so that it is not located above the scraper disc 1, that is, the scraper disc 1 is not restricted from moving upward. At this time, the scraper disc 1 can move upward synchronously under the drive of the drill rod moving upward, which makes it convenient to remove the scraper disc 1. In this embodiment, the non-working position is specifically the second end of the stop block 405 rotated outward to be close to the inner wall of the frame 2. As long as space is made so that the stop block 405 is not located above the scraper disc 1 and does not contact or interfere with the scraper disc 1, it is sufficient. In this embodiment, in order to ensure that the two do not interfere with each other in the non-working position, the stop block 405 fully avoids contact with the scraper disc 1 and makes as much space as possible in the middle. The stop block 405 is rotated so that its second end is close to the inner wall of the frame 2.

[0056] like Figure 2 , 3 As shown, when the stop block 405 rotates to the working position where its second end is above the sludge scraper 1, the side of the stop block 405 contacts and is positioned with the first positioning device 7, and the first positioning device 7 ensures that the stop block 405 is restricted to the working position.

[0057] like Figure 5As shown, when the stop block 405 rotates to a non-working position where its second end is located away from the scraper disc 1, the side of the stop block 405 contacts and is positioned with the second positioning device 8. The second positioning device 8 ensures that the stop block 405 is restricted to the non-working position. The first positioning device 7 and the second positioning device 8 can also determine the rotation angle range of the stop block 405.

[0058] Each stop assembly 4 is provided with a first positioning device 7 and a second positioning device 8.

[0059] In this embodiment, the first positioning device 7 and the second positioning device 8 have the same structure; Specifically, such as Figure 4 As shown, the first positioning device 7 includes: a column 701, a magnetic component 703, and a first fastener 704.

[0060] A recessed hole 702 is provided on the side of the column 701 at the same height as the stop 405 and away from the stop 405. A magnetic element 703 is a strong magnet and is disposed in the recessed hole 702, located at the bottom of the recessed hole 702 and close to the stop 405. The magnetic element 703 is used to attract and adhere to the stop 405 on the column 701, thereby playing a limiting role.

[0061] The first fastener 704 is screwed into the recess 702. The first fastener 704 extends into the recess 702 from the side away from the stop block 405 for connection and fastening. The first fastener 704 can be implemented by screws or the like. A matching inner loop is provided in the recess 702. The end of the first fastener 704 abuts against the strong magnet to abut and fix the magnetic component 703 and prevent it from loosening and falling out.

[0062] To improve the adsorption effect, small holes smaller than the diameter of the pore 702 can also be made at the bottom of the pore 702.

[0063] In another embodiment, to prevent the first fastener 704 from falling out due to prolonged vibration, the first positioning device 7 further includes a second fastener 705. The second fastener 705 is screwed onto the base plate 11 in a direction perpendicular to the first fastener 704. Specifically, the base plate 11 is provided with a boss 706 for connecting the second fastener 705. The boss 706 is located on the side of the column 701 away from the stop block 405. The second fastener 705 is screwed onto the boss 706, and the second fastener 705 is vertically positioned on the side of the first fastener 704 away from the stop block 405. After the second fastener 705 is tightened in place, its top is higher than the first fastener 704, and the second fastener 705 is located on the path through which the first fastener 704 is screwed out, in order to restrict the first fastener 704 from loosening and sliding out.

[0064] Since the top of the frame 2 is open and the top opening of the frame 2 is fixed to the bottom of the clamp, after the frame 2 is fixed on the clamp, the path of the second fastener 705 to rotate upward is restricted by the upper clamp, so the second fastener 705 is not easy to slide out. The second fastener 705 restricts the first fastener 704, ensuring that the first fastener 704 is not easy to slide out, thereby ensuring that the magnetic component 703 is not easy to slide out.

[0065] In this embodiment, the fastening component 5 includes: a fixing sleeve 501, a third fastener 503, and a second snap ring 504.

[0066] The fixing sleeve 501 is disposed in the frame 2. A stepped hole 502 is provided in the fixing sleeve 501 near the bottom plate 11. That is, a stepped hole 502 is provided at the bottom of the fixing sleeve 501. The stepped hole 502 is a through hole that passes through the upper and lower ends of the fixing sleeve 501. A through hole is provided on the bottom plate 11 below the fixing sleeve 501, so that the third fastener 503 can be inserted through the bottom of the bottom plate 11 for installation and fixation. Specifically, after the third fastener 503 passes through the matching step hole 502 from the bottom plate 11, the end of the third fastener 503 extends out above the fixing sleeve 501 for connection and fixation with the clip.

[0067] To ensure the third fastener does not fall downwards, a second retaining ring 504 is fitted and fixed to the inner wall of the stepped hole 502 and located below the third fastener 503 to prevent the third fastener 503 from sliding out.

[0068] In this embodiment, an earring 9 is provided on the second end of the stop block 405, which facilitates the insertion of a hook or similar device from the top of the slip into the frame 2. The hook hooks onto the earring 9, causing the stop block 405 to rotate. Specifically, when the stop block 405 is in the non-working position, an earring 9 is provided on the side of its second end near the scraper disc 1, so that when the stop block 405 is in the non-working position, the earring 9 is located on the inner side near the scraper disc 1, and the hook inserted from above the slip through the inner side can effectively hook the earring 9.

[0069] A notch 10 is provided on one side of the frame 2. The notch 10 is connected to the through hole 3 on the base plate 11. That is, the notch 10 is provided on the side of the frame 2 and passes through the corresponding side of the base plate 11. It is also connected to the through hole 3 in the center of the base plate 11. The notch 10 allows the entire mud scraping device to be inserted into the drill rod from the side without affecting the drill rod and the slip. The mud scraping disc 1 can be installed without being inserted into the slip along with the frame 2. The mud scraping disc 1 can be wrapped around the drill rod separately.

[0070] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, and not to limit them; although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some or all of the technical features; and these modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of the present invention.

Claims

1. A mud scraper, characterized in that, The mud scraping disc is an elastic spiral mud scraping disc which is wrapped around the outer periphery of the drill pipe by at least one turn; The mud scraping disc comprises: A support ring which is arranged in a spiral layer by layer; A mud scraping ring, the outer ring of which is connected with the inner ring of the support ring, the inner ring of the mud scraping ring is fitted to the outer periphery of the drill pipe, the thickness of the mud scraping ring is smaller than that of the support ring, and the mud scraping rings are spaced apart from each other in the axial direction.

2. The mud scraper of claim 1, wherein, The support ring is provided with a spiral spring in the spiral direction thereof.

3. The mud scraper of claim 1, wherein, The inner edge of the mud scraping ring on the side away from the drilling well is radially outwardly inclined.

4. The mud scraper of claim 1, wherein, The inner edge of the mud scraping ring on the side away from the drilling well is provided with a convex edge.

5. A mud scraping device, characterized in that Comprise: The mud scraping disc according to any one of claims 1-4; A rack, the bottom of which is provided with a bottom plate for supporting the mud scraping disc, and the bottom plate is provided with a through hole for the drill to pass through; A plurality of stop block assemblies are arranged at intervals in the circumferential direction of the mud scraping disc, and the stop block assemblies and the bottom plate respectively clamp the end faces of the mud scraping disc; A plurality of fastening assemblies are arranged on the inner wall of the rack for connection and fixation with the slips.

6. The mud scraping device of claim 5, wherein, The stop block assembly comprises: A mandrel is arranged on the bottom plate at the outer periphery of the mud scraping disc, and the mandrel is provided with a step; A bearing member is sleeved on the mandrel, and the bearing member is positioned in abutment with the end face of the step; A stop block has a first end sleeved on the mandrel and a second end for contacting one end of the mud scraping disc away from the bottom plate; Two half rings are arranged on the mandrel on the side away from the bearing member, and the two half rings are oppositely clamped in the clamping groove, for limiting the stop block; A fixing disc is sleeved on the mandrel, and the fixing disc is provided with a stepped groove sleeved on the end face and the outer periphery of the half ring; A first clamping spring is clamped and fixed on the mandrel, and the first clamping spring is located on the side away from the half ring of the fixing disc.

7. The mud scraping device of claim 6, wherein, First and second positioning devices are arranged corresponding to the working position and the non-working position of the stop block assembly; When the stop block is rotated to the working position in which the second end of the stop block is located above the mud scraping disc, the side surface of the stop block is in contact with the first positioning device for positioning; When the stop block is rotated to the non-working position in which the second end of the stop block is located away from above the mud scraping disc, the side surface of the stop block is in contact with the second positioning device for positioning.

8. The mud scraping device of claim 7, wherein, The first positioning device and the second positioning device are identical in structure; The first positioning device comprises: A stand is provided with an embedded hole on the side surface thereof at the same height as the stop block and on the side away from the stop block; A magnetic member is arranged in the embedded hole, and the magnetic member is used for adsorbing and abutting the stop block on the stand; A first fastener is screwed in the embedded hole, and is used for abutting and fixing the magnetic member; The first positioning device further comprises a second fastener, which is screwed on the bottom plate in a direction perpendicular to the first fastener, and the top of the second fastener after being fastened in place is higher than the second fastener, and is used for limiting the first fastener from loosening and sliding out.

9. The mud scraping device of claim 5, wherein, The fastening assembly comprises: A fixing sleeve is arranged in the rack, and the fixing sleeve is provided with a stepped hole at the end close to the bottom plate; A third fastener, which, after penetrating into the stepped hole from the bottom plate, has its end protruding out of the fixing sleeve for connecting with the slip; A second snap spring, which is matched and fixed in the inner wall of the stepped hole, is used for limiting the third fastener from sliding out.

10. The mud scraping device of claim 7, wherein, The second end of the stopper is provided with an ear near the side of the mud scraper in the non-working position. A notch is formed on one side of the rack, and the notch is communicated to the through hole on the bottom plate.

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