Mud scraping disc

Abstract

The utility model relates to the technical field of petroleum mechanical devices, in particular to a mud scraping disc which comprises semicircular mud scraping sheet frames arranged on the two sides of a drill rod in pairs and multiple layers of semicircular mud scraping sheets arranged on the inner sides of the mud scraping sheet frames. The mud scraping sheet frames which are oppositely arranged surround the drill rod to form an annular frame structure; the annular mud scraping pieces on the same layer are oppositely arranged and spliced into the annular mud scraping plate with a through hole in the middle, and the diameter of the through hole formed by splicing the mud scraping pieces located on the bottom layer is the largest. The mud scraping disc can move front and back along with the drill rod and is kept concentric with the drill rod. The drill rod and the drill rod coupling are cleaned at the same time through the mud scraping pieces of different sizes, and therefore cleaning of dead corners at the connecting position of the drill rod and the drill rod coupling is achieved.

Description

Technical Field

[0001] The utility model relates to the technical field of petroleum mechanical devices, in particular to a mud scraper disc. Background Art

[0002] With the continuous development of oil drilling technology, the requirements for automation in the drilling process are increasing. After pulling out of the hole, the mud remaining on the outer wall of the drill pipe will have an adverse effect on the make-up and break-out operations of the iron roughneck and the accurate recognition of the machine vision, thus affecting the drilling efficiency and safety. Therefore, the effective treatment of mud during drilling is particularly important.

[0003] In the prior art, for example, the Chinese patent application with publication number CN114439377A provides an automatic scraper for a drill pipe, in which double-layer arc-shaped rubber scrapers are respectively installed on the scraper discs located on both sides of the drill pipe, and the rubber scrapers on both sides can be assembled into a ring shape, and the inner diameters of the rubber scrapers are the same. A straightening mechanism is installed above the scraper disc to drive the scraper disc to move, ensuring that the scraper disc is coaxial with the drill pipe to achieve the scraping function.

[0004] However, the above-mentioned automatic scraper for drill pipe still has the following defects: the connection of the scraper blades on both sides is prone to mud cleaning dead corners, especially when the drill pipe is lifted up, when the scraper blade passes through the drill pipe coupling, because the diameter of the drill pipe coupling is larger than the drill pipe, the drill pipe coupling with increased diameter will open the scraper discs clamped on both sides of the drill pipe, resulting in the scraper blades not being able to fully fit with the drill pipe, affecting the scraping effect. In addition, since the straightening mechanism installed above the scraper disc has a complex structure and contains multiple parts, it is located above the wellhead when working, and there is a risk of falling into the well.

[0005] Therefore, there is an urgent need for a scraper plate that can solve the problem that the connection between the drill pipe and the drill pipe coupling is difficult to clean, and at the same time can simplify the structure and reduce the risk of parts falling into the well. Utility Model Content

[0006] 1. Technical issues to be resolved

[0007] In view of the above-mentioned shortcomings and deficiencies of the prior art, the utility model provides a mud scraper disc, which solves the technical problems that the connection between the drill pipe and the drill pipe coupling is difficult to clean, the straightening mechanism has a complex structure, and parts are easily dropped into the well.

[0008] (II) Technical solution

[0009] In order to achieve the above-mentioned purpose, the main technical solutions adopted by the utility model include:

[0010] A scraper disc comprises a semi-annular scraper blade frame arranged in pairs on both sides of a drill pipe, and a multi-layer semi-annular scraper blade arranged inside the scraper blade frame;

[0011] The relatively arranged sludge scraping blade frames form an annular frame structure around the drill pipe;

[0012] The annular sludge scraping blades on the same layer are relatively arranged and are assembled into an annular sludge scraping plate with a through hole in the middle. The diameter of the through hole formed by the assembled sludge scraping blades at the bottom layer is the largest;

[0013] The sludge scraping disc can move back and forth along with the drill pipe and remains concentric with the drill pipe.

[0014] The projection of the splicing seams of the sludge scraping blades on different layers on the same horizontal plane are staggered from each other.

[0015] One end of the sludge scraping blade is provided with a protrusion, and the other end is correspondingly provided with a notch that can be spliced with the protrusion, so that the relatively arranged sludge scraping blades on each layer can be assembled into an annular sludge scraping plate.

[0016] Each sludge scraping blade is provided with a plurality of slots with equal numbers, and the staggered angle of the slot positions of the vertically adjacent sludge scraping blades is 20°.

[0017] The sludge scraping blade frame includes a side wall and a bottom plate fixed to the bottom of the side wall;

[0018] The top of the sludge scraping blade frame is also provided with a detachable cover plate. The side wall, the bottom plate and the cover plate form an installation cavity for installing the sludge scraping blades.

[0019] The inner edge of the cover plate is provided with a protruding pressing piece, and the pressing piece is correspondingly arranged on the side of the sludge scraping blade with the protrusion.

[0020] A spacer is provided between the vertically adjacent sludge scraping blades.

[0021] It further includes a clamping member connecting the sludge scraping blade frames. The clamping member includes a first connecting rod and a second connecting rod. One ends of the first connecting rod and the second connecting rod are respectively connected to the relatively arranged sludge scraping blade frames, and the other ends of the first connecting rod and the second connecting rod intersect and are hinged to the main body of the drill pipe sludge scraper.

[0022] The number of layers of the sludge scraping blades is at least three.

[0023] (III) Beneficial effects

[0024] The beneficial effects of the utility model are as follows: the utility model provides a scraper disc, which is applied to a drill pipe scraper, comprising a scraper blade frame arranged in pairs around the drill pipe, and a scraper blade arranged on the inner side of the scraper blade frame, wherein the middle part of the scraper blade is relatively provided with a through hole for passing the drill pipe, and the size of the through hole decreases layer by layer from bottom to top, the inner circle size of the top scraper blade is the smallest, the middle layer is slightly larger, and the bottom layer is the largest, so that scrapers of different sizes can be matched with the drill pipe and the drill pipe coupling respectively, so that the multi-layer scraper blade can clean the dead angle at the connection between the drill pipe and the drill pipe coupling.

[0025] When the drill pipe moves, the scraper blades and the drill pipe are directly subjected to force. By setting at least three layers of scraper blades, the overall strength of the scraper disc is improved to ensure that the scraper disc can be driven to remain concentric with the drill pipe without damaging the scraper blades. The self-centering function can be achieved without the need for an additional straightening mechanism. The overall structure is simpler, avoiding excessive parts that increase the risk of falling into the well.

[0026] The splicing positions of the three-layer scraper blades are staggered so that even if a splicing position of a relatively arranged layer of scraper blades is stretched open by the drill rod to produce a gap, it can still be covered by the adjacent scraper blades, so that the overall scraping effect of the multi-layer scraper blades is better and the scraping function is guaranteed. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] Figure 1 A three-dimensional diagram of the scraper plate of the utility model;

[0028] Figure 2 A top view of the scraper blade of the utility model;

[0029] Figure 3 This is a stereoscopic diagram of the drill rod of the utility model passing through the scraper plate.

[0030] [Description of Reference Numerals]

[0031] 1: scraper blade frame; 11: side wall; 12: cover plate; 13: press sheet;

[0032] 2: scraper blade; 21: protrusion; 22: notch; 23: top scraper blade; 24: middle scraper blade; 25: bottom scraper blade;

[0033] 3: drill pipe; 31: drill pipe coupling;

[0034] 4: Pad;

[0035] 5: clamping mechanism; 51: first clamping rod; 52: second clamping rod. DETAILED DESCRIPTION

[0036] For better explaining the present utility model to facilitate understanding, the following will combine with the attached drawings and make a detailed description of the present utility model through specific embodiments. Among them, the orientation nouns such as "upper", "lower", etc. mentioned in this article are referenced with Figure 1 the orientation of Figure 1 .

[0037] Referring to the attached Figures 1-3 As shown, the present utility model provides a mud scraping disc, which includes paired mud scraping blade frames 1. The mud scraping blade frames 1 form an annular frame structure around the drill pipe 3. There are multiple layers of semi-annular mud scraping blades 2 inside the mud scraping blade frames 1. The relatively arranged mud scraping blades 2 surround the drill pipe 3 and are assembled into an annular mud scraping plate with a through hole in the middle.

[0038] The size of the through hole in the middle of each layer of mud scraping blade 2 gradually decreases from bottom to top. The inner edges of the mud scraping blades 2 located at the top layer and the middle layer can abut against the outer wall of the drill pipe 3, and the inner edges of the mud scraping blades 2 located at the bottom layer can abut against the drill pipe collar 31, so that the multiple layers of mud scraping blades 2 can clean the drill pipe 3 and the drill pipe collar 31 at the same time, thereby realizing the cleaning of the dead angle at the connection of the drill pipe 3 and the drill pipe collar 31.

[0039] When using the mud scraping disc, the mud scraping disc is driven by a driving device to clamp the drill pipe 3. The mud scraping disc is connected with a floating mechanism and has the function of floating left and right or front and back. When the drill pipe 3 moves, the mud scraping blade 2 and the drill pipe 3 are directly stressed, and the mud scraping disc will be driven to move with the drill pipe 3 and remain concentric with the drill pipe 3. Since the mud scraping disc is provided with multiple layers of mud scraping blades 2, the overall bearing capacity of the mud scraping blades 2 is stronger, ensuring that the mud scraping disc can be driven to be concentric with the drill pipe 3 without damaging the mud scraping blades 2, and the self-centering function can be realized without setting a centering mechanism.

[0040] To better understand the above technical solution, the following will describe the exemplary embodiments of the present utility model in more detail with reference to the attached drawings. Although the exemplary embodiments of the present utility model are shown in the drawings, it should be understood that the present utility model can be implemented in various forms and should not be limited by the embodiments described herein. On the contrary, these embodiments are provided to enable a clearer and more thorough understanding of the present utility model and to be able to convey the scope of the present utility model completely to those skilled in the art.

[0041] An embodiment of the present utility model provides a mud scraping disc, which is applied to a drill pipe mud scraper. The drill pipe mud scraper has a floating mechanism that enables the mud scraping disc to move back and forth or left and right, and a driving mechanism that can drive the mud scraping discs on both sides of the drill pipe 3 to clamp the drill pipe 3.

[0042] The mud scraping disc includes semi-circular mud scraping blade frames 1 arranged in pairs around the drill pipe 3, and multiple layers of semi-circular mud scraping blades 2 arranged inside the mud scraping blade frames 1. The paired mud scraping blade frames 1 form an annular frame structure around the drill pipe 3, and the relatively arranged semi-circular mud scraping blades 2 are assembled into an annular mud scraping plate with a through hole in the middle. The size of the through hole in the middle of each layer of mud scraping blades 2 decreases layer by layer from bottom to top, and the number of layers of the mud scraping blades 2 is at least three. By setting the mud scraping blades 2 of different sizes to match the drill pipe 3 and the drill pipe collar 31 respectively, the multiple layers of mud scraping blades 2 can clean the drill pipe 3 and the drill pipe collar 31 simultaneously.

[0043] When using the mud scraping disc, the mud scraping disc is driven by a driving device to clamp the drill pipe 3 from both sides. The mud scraping blades 2 located at the top layer and the middle layer are forced to abut against the outer wall of the drill pipe 3. When the drill pipe 3 moves, the mud scraping blades 2 and the drill pipe 3 are directly stressed, and the mud scraping disc will be driven to move with the drill pipe 3 and remain concentric with the drill pipe 3. Since the mud scraping disc is provided with multiple layers of mud scraping blades 2, the overall bearing capacity of the mud scraping blades 2 is stronger, ensuring that the mud scraping disc can be driven to be concentric with the drill pipe 3 without damaging the mud scraping blades 2. Therefore, there is no need to set up a centering mechanism, and the self-centering function can be realized. The overall structure is more concise, avoiding excessive parts from increasing the risk of falling into the well.

[0044] When the drill pipe 3 is lifted upward to the position of the drill pipe collar 31, the drill pipe 3 first passes through the mud scraping blades 2 located at the top layer and the middle layer, and the mud scraping blades 2 located at the lower layer abut against the outer wall of the drill pipe collar 31. The multiple layers of mud scraping blades 2 can clean the drill pipe 3 and the drill pipe collar 31 simultaneously, so as to clean the dead angle at the connection between the drill pipe 3 and the drill pipe collar 31.

[0045] The mud scraping blade frame 1, as the frame structure of the mud scraping disc, is used to install multiple layers of mud scraping blades 2. The mud scraping blade frame 1 is semi-circular, and the paired mud scraping blade frames 1 are assembled into an annular frame structure around the drill pipe 3. The mud scraping blade frame 1 includes a side wall 11 and a bottom plate fixed at the bottom of the side wall 11, and the side wall 11 and the bottom plate are welded and fixed. A detachable cover plate 12 is also provided at the top of the mud scraping blade frame 1, and the side wall 11, the bottom plate and the cover plate 12 form an installation cavity for installing the mud scraping blades 2.

[0046] The mud scraping blades 2 are arranged between the cover plate 12 and the bottom plate of the mud scraping blade frame 1. The mud scraping blades 2 are semi-circular, and the shape of the mud scraping blades 2 matches that of the mud scraping blade frame 1. The two mud scraping blades 2 of each layer are arranged oppositely and assembled into an annular mud scraping plate with a through hole in the middle. The two mud scraping blades 2 of each layer have the same size and can form a standard mud scraping blade. The size of the through hole formed by the two mud scraping blades 2 of each layer decreases layer by layer from bottom to top, and the through hole size of the topmost layer is the smallest.

[0047] The scraper blade 2 has at least three layers, including a top scraper blade 23, a middle scraper blade 24 and a bottom scraper blade 25 arranged in sequence from top to bottom. The top scraper blade 23 and the middle scraper blade 24 are mainly responsible for scraping the mud on the surface of the drill rod 3, while the bottom scraper blade 25 is used to process the drill rod coupling 31. The inner diameter of the bottom scraper blade 25 is larger than the diameter of the drill rod 3, so it does not contact the surface of the drill rod 3 when pulling out the drill rod, and only contacts the drill rod coupling 31 when passing through the drill rod coupling 31, thereby effectively cleaning the mud on the drill rod coupling 31.

[0048] When the driving device drives the scraper disc to clamp the drill rod 3, the top scraper blade 23 and the middle scraper blade 24 are squeezed and abut against the outer wall of the drill rod 3, and the outer wall of the drill rod 3 is continuously scraped during the process of the drill rod 3 being lifted up. At this time, the bottom scraper blade 25 does not contact the surface of the drill rod 3 until the drill rod coupling 31 moves to the through hole of the bottom scraper blade 25, the bottom scraper blade 25 abuts against the outer wall of the drill rod coupling 31, the top scraper blade 23 and the middle scraper blade 24 keep abutting against the outer wall of the drill rod 3, and the top scraper blade 23, the middle scraper blade 24 and the bottom scraper blade 25 scrape the outer wall of the drill rod 3 and the outer wall of the drill rod coupling 31 at the same time, thereby cleaning the dead angle at the connection between the drill rod 3 and the drill rod coupling 31.

[0049] The projections of the joints of the scraper blades 2 of different layers on the same horizontal plane are staggered with each other, so that even if the joints of a relatively arranged layer of scraper blades 2 are stretched open by the drill rod 3 to produce gaps, they can still be covered by the scraper blades 2 adjacent to each other, so that the overall scraping effect of the multi-layer scraper blades 2 is better and the scraping function is guaranteed.

[0050] One end of the scraper blade 2 is provided with a protrusion 21, and the other end opposite thereto is correspondingly provided with a notch 22 that can be assembled with the protrusion 21, so that the relatively arranged semi-annular scraper blades 2 are assembled into an annular scraper plate with a through hole in the middle.

[0051] The protrusion 21 located in the next layer is arranged at the other end opposite to the scraper blade 2 of the upper layer, that is, the protrusion 21 of the middle scraper blade 24 is arranged at the other end away from the protrusion 21 of the top scraper blade 23, so that the upper and lower layers of the scraper plate 2 are staggered in their splicing positions. Even when the splicing positions of the relatively arranged scraper blades 2 are stretched open by the drill rod 3 to produce gaps, the adjacent scraper blades 2 can still cover the positions at the gaps, thereby improving the scraping effect of the multi-layer scraper blades 2.

[0052] Each scraper blade 2 is provided with two grooves, so that the scraper blade can better fit the drill rod 3 when deformed, and the groove positions of each layer of scraper blade 2 are staggered at an angle of 20° to ensure that no mud is missed during the cleaning process.

[0053] The scraping blade 2 is made of a composite rubber material, providing appropriate strength to ensure that the scraping blade can abut against the outer wall of the drill pipe 3. At the same time, it has good wear resistance and is not prone to rigid damage.

[0054] The inner edge of the cover plate 12 is provided with a protruding pressing piece 13. The pressing piece 13 is correspondingly arranged on the side of the scraping blade 2 with a protruding part 21. Since one end of the scraping blade 2 with the protruding part 21 is prone to deformation, by setting the pressing piece 13 to press the scraping blade 2, it provides support for the scraping blade 2 during deformation, ensuring that this part, like other parts, maintains sufficient friction with the drill pipe 3.

[0055] A spacer plate 4 is provided between the top scraping blade 23 and the middle scraping blade 24. The spacer plate 4 can isolate the top scraping blade 23 and the middle scraping blade 24, making there be a gap between the top scraping blade 23 and the middle scraping blade 24. The function of the spacer plate 4 is to prevent the middle scraping blade 24 from lifting the top scraping blade 23 due to the upward warping deformation of the scraping blade 2 during the operation of the scraping disc, ensuring the stability of the scraping effect.

[0056] It further includes a clamping member 5 connecting the scraping blade frame 1. The clamping member 5 includes a first connecting rod 51 and a second connecting rod 52. One ends of the first connecting rod 51 and the second connecting rod 52 are respectively connected to the relatively arranged scraping blade frames 1, and the other ends of the first connecting rod 51 and the second connecting rod 52 intersect and are hinged to the main body of the drill pipe scraper.

[0057] In the working state, the driving scraping disc clamps the drill pipe. When the drill pipe is lifted, the three-layer scraping blade 2 can effectively remove the mud on the surface of the drill pipe through the friction force between the scraping blade 2 and the drill pipe 3.

[0058] The embodiment of the present utility model provides a scraping disc, which is applied to a drill pipe scraper. It includes scraping blade frames 1 arranged in pairs around the drill pipe 3, and scraping blades 2 arranged inside the scraping blade frames 1. A through hole for passing the drill pipe 3 is provided in the middle of the relatively arranged scraping blades 2. By setting through holes with gradually decreasing sizes from bottom to top in the middle of each layer of relatively arranged scraping blades 2, the multi-layer scraping blades 2 can clean the dead corners at the connection between the drill pipe 3 and the drill pipe coupling 31.

[0059] When the drill pipe 3 is lifted, the scraping blade 2 and the drill pipe 3 are directly stressed. By setting at least three layers of scraping blades 2, the overall strength of the scraping disc is improved, ensuring that the scraping disc can be driven to be concentric with the drill pipe 3 as the drill pipe 3 moves without damaging the scraping blade 2. Without additionally setting a centering mechanism, the self-centering function can be achieved, and the overall structure is more concise, avoiding the risk of increasing the risk of falling into the well due to too many parts.

[0060] The splicing positions of the three-layer mud scraping blades 2 are staggered, so that even when a gap is generated at the splicing part of a certain layer of mud scraping blades 2 arranged oppositely due to being propped open by the drill pipe 3, it can still be covered by the adjacent mud scraping blades 2, making the overall mud scraping effect of the multi-layer mud scraping blades 2 better and ensuring the realization of the mud scraping function.

[0061] In the description of the present utility model, it should be understood that the terms "first" and "second" are only used for descriptive purposes and cannot be construed as indicating or implying relative importance or implicitly specifying the quantity of the indicated technical features. Thus, the features defined with "first" and "second" may explicitly or implicitly include one or more of such features. In the description of the present utility model, the meaning of "a plurality" is two or more, unless otherwise specifically defined.

[0062] In the present utility model, unless otherwise clearly defined and limited, the terms "installed", "connected", "connected with", "fixed" and other terms should be understood in a broad sense. For example, it may be a fixed connection, a detachable connection, or integrated; it may be a mechanical connection or an electrical connection; it may be directly connected or indirectly connected through an intermediate medium; it may be the internal communication of two components or the interaction relationship between two components. For those of ordinary skill in the art, the specific meanings of the above terms in the present utility model can be understood according to specific circumstances.

[0063] In the present utility model, unless otherwise clearly defined and limited, the first feature being "on" or "under" the second feature may be that the first and second features are in direct contact, or the first and second features are indirectly in contact through an intermediate medium. Moreover, the first feature being "above", "over" and "on" the second feature may be that the first feature is directly above or obliquely above the second feature, or merely indicates that the first feature has a higher horizontal height than the second feature. The first feature being "under", "below" and "beneath" the second feature may be that the first feature is directly below or obliquely below the second feature, or merely indicates that the first feature has a lower horizontal height than the second feature.

[0064] In the description of this specification, the description of terms such as "one embodiment", "some embodiments", "embodiment", "example", "specific example" or "some examples" means that the specific features, structures, materials or characteristics described in connection with the embodiment or example are included in at least one embodiment or example of the present utility model. In this specification, the schematic descriptions of the above terms do not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described can be combined in a suitable manner in any one or more embodiments or examples. In addition, without contradiction, those skilled in the art can combine and combine the different embodiments or examples described in this specification and the features of different embodiments or examples.

[0065] Although the embodiments of the present utility model have been shown and described above, it can be understood that the above embodiments are exemplary and should not be construed as limiting the present utility model. Those of ordinary skill in the art can make changes, modifications, substitutions, and variations to the above embodiments within the scope of the present utility model.

Claims

1. A mud scraping tray, characterized in that, It includes semi-circular mud scraping blade frames (1) arranged in pairs on both sides of the drill pipe (3), and multiple layers of semi-circular mud scraping blades (2) arranged inside the mud scraping blade frames (1); The relatively arranged mud scraping blade frames (1) form an annular frame structure around the drill pipe (3); The annular mud scraping blades (2) of the same layer are arranged oppositely and are pieced together to form an annular mud scraping plate with a through hole in the middle. The diameter of the through hole formed by piecing together the mud scraping blades (2) at the bottom layer is the largest; The mud scraping disc can move back and forth along with the drill pipe (3) and remains concentric with the drill pipe (3).

2. The mud scraping disc according to claim 1, characterized in that The projections of the splicing seams of the mud scraping blades (2) in different layers on the same horizontal plane are staggered from each other.

3. The mud scraping disc according to claim 2, characterized in that One end of the mud scraping blade (2) is provided with a protruding portion (21), and the other end is correspondingly provided with a notch (22) that can be spliced with the protruding portion (21), so that the relatively arranged mud scraping blades (2) in each layer can be spliced into an annular mud scraping plate.

4. The mud scraping disc according to claim 3, characterized in that Each mud scraping blade (2) is provided with a plurality of slots with equal numbers, and the staggered angle of the slot positions of the vertically adjacent mud scraping blades (2) is 20°.

5. The mud scraping disc according to claim 3, characterized in that The mud scraping blade frame (1) includes a side wall (11) and a bottom plate fixed to the bottom of the side wall (11); The top of the mud scraping blade frame (1) is further provided with a detachable cover plate (12), and the side wall (11), the bottom plate and the cover plate (12) form an installation cavity for installing the mud scraping blades (2).

6. The mud scraping disc according to claim 5, characterized in that The inner edge of the cover plate (12) is provided with a protruding pressing piece (13), and the pressing piece (13) is correspondingly arranged on the side of the mud scraping blade (2) with the protruding portion (21).

7. The mud scraping disc according to claim 1, characterized in that A spacer plate (4) is arranged between the vertically adjacent mud scraping blades (2).

8. The mud scraping disc according to claim 1, characterized in that It further includes a clamping member (5) connecting the mud scraping blade frames (1). The clamping member (5) includes a first connecting rod (51) and a second connecting rod (52). One ends of the first connecting rod (51) and the second connecting rod (52) are respectively connected to the relatively arranged mud scraping blade frames (1), and the other ends of the first connecting rod (51) and the second connecting rod (52) intersect and are hinged to the drill pipe mud scraper body.

9. The mud scraping disc according to claim 1, characterized in that The number of layers of the mud scraping blades (2) is at least three layers.

Images