Magnetic sleeve skiving device

Abstract

The application relates to the technical field of casing scraping devices and discloses a magnetic casing scraping device which comprises a cylinder body and a scraping cylinder, the outer side of the cylinder body is provided with the scraping cylinder in the middle part in a transmission connection mode, the scraping cylinder can slide up and down relative to the cylinder body, a plurality of magnetic scraping components are arranged on the outer side of the scraping cylinder in a circumferential direction, the magnetic scraping component comprises a scraping block made of a permanent magnet material and a scraping sheet, a plurality of staggered scraping grooves are arranged on the outer side of the scraping cylinder, the scraping blocks are arranged on the scraping grooves, and a plurality of scraping sheets are arranged on the scraping blocks. The application has the advantages of reasonable and compact structure, convenient use, the magnetic scraping components can scrape off ferromagnetic substances by magnetic adsorption while scraping off impurities, the application can reduce the pollution of the casing caused by the scattering of the impurities and reduce the risk of equipment blockage, the application can collect large-particle-size impurities through a slag collecting groove, the application can reduce the influence of the impurities on the scraping, and the cleaning effect is better.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of casing scraping device, and is a magnetic casing scraping device. BACKGROUND

[0002] The casing scraper is a key tool for cleaning the inner wall of the casing in oil drilling, well repair and well completion operations. Its core function is to remove various types of debris attached to the inner wall of the casing to ensure the smooth implementation of subsequent downhole operations.

[0003] In the prior art, the GGQ type spring scraper mainly consists of a mandrel, a cutter body, a limiting block, a pressing block, a spring and a screw. Its structural features are that the cutter body is fixedly connected with the pressing block, the spring is arranged between the pressing block and the mandrel, and the maximum installation outer diameter of the cutter body is greater than the inner diameter of the target casing. Its working principle is that during the process of going down the well, the cutter body is radially retracted by compressing the spring through the pressing block; after entering the well, the spring releases the elastic force to push the pressing block, drives the cutter body to radially expand and tightly adhere to the inner wall of the casing, and through the up-down reciprocating spiral movement of the whole scraper in the pipe string, the scraping operation of the debris attached to the inner wall of the casing is completed.

[0004] This type of scraper needs to adjust the radial sliding distance of the pressing block in advance according to the actual inner diameter of the target casing before entering the well, so as to ensure the adhesion accuracy of the cutter body and the inner wall of the casing. However, under complex well conditions (such as uneven casing inner diameter, significant difference in hardness and thickness of attached debris, etc.), the debris falls off and easily blocks the equipment when the workover fluid is returned and discharged. Secondly, the spring type scraper has limited adjustment of scraping force, so the cleaning effect is insufficient. In order to ensure the cleaning effect, the number of up-down reciprocating scraping is increased, which leads to the extension of operation time and the reduction of scraping efficiency. SUMMARY

[0005] The present application provides a magnetic casing scraping device, which overcomes the shortcomings of the prior art. It can effectively solve the problems of long scraping time and low efficiency caused by the falling of debris and the limited adjustment of scraping force during the scraping of the existing scraper.

[0006] The technical scheme of the present application is realized by the following measures: a magnetic casing scraping device, comprising a cylinder body and a scraping cylinder, the scraping cylinder is drivingly connected to the outer side of the middle part of the cylinder body, the scraping cylinder can slide up and down relative to the cylinder body, a plurality of magnetic scraping components are arranged on the outer side of the scraping cylinder in a circumferential direction, each magnetic scraping component comprises a scraping block made of permanent magnetic material and a scraping sheet, a plurality of staggered scraping grooves are arranged on the outer side of the scraping cylinder, the scraping blocks are installed on the scraping grooves, and a plurality of scraping sheets are arranged on the scraping blocks.

[0007] The following is a further optimization or / and improvement of the above-mentioned technical scheme:

[0008] Preferably, the scraping block and the corresponding scraping groove are provided with an elastic connecting assembly, the elastic connecting assembly comprises a second spring and an extension slide rod, the extension slide rod and the second spring are installed between the scraping block and the bottom of the scraping groove.

[0009] Preferably, the scraping cylinder is provided with a plurality of through horizontal grooves, the horizontal grooves are provided with displacement blocks capable of sliding in the radial direction of the scraping cylinder, the displacement blocks are provided with scraping grooves opening outward, the inner wall of the displacement block is a wedge-shaped groove with a large upper inner diameter and a small lower inner diameter, the outer wall of the cylinder body is provided with a wedge ring with a large upper inner diameter and a small lower inner diameter, and the outer side of the wedge ring is matched with the inner side of the wedge-shaped groove.

[0010] Preferably, the inner side of the upper part of the scraping cylinder is provided with a plurality of vertical sliding grooves, the cylinder body is provided with mounting holes corresponding to the positions of the vertical sliding grooves, vertical sliding blocks are installed in the vertical sliding grooves, the inner ends of the vertical sliding blocks are located in the mounting holes, a transmission cavity is arranged between the outer wall of the cylinder body and the inner wall of the scraping cylinder in the upper part, and a first spring is installed in the transmission cavity.

[0011] Preferably, the lower part of the scraping cylinder is provided with a plurality of slag collecting grooves opening downward, the slag collecting grooves are staggered with the lower magnetic scraping assembly, the lower end of the cylinder body is provided with a hollow collecting block, the upper part and the lower part of the collecting block are both conical structures, and the lower side of the scraping cylinder can cover the opening of the lower end of the slag collecting groove when the lower side of the scraping cylinder is located on the upper side of the collecting block.

[0012] The present application has reasonable and compact structure, is convenient to use, the magnetic scraping assembly can scrape off ferromagnetic materials while scraping off impurities, reduces the pollution of the casing caused by the scattering of impurities, reduces the risk of equipment blockage, collects large-particle impurities through the slag collecting groove, reduces the influence of impurities on scraping, and has better cleaning effect. BRIEF DESCRIPTION OF DRAWINGS

[0013] FIG. 1 is a schematic diagram of the overall structure of the present application. Figure 1 FIG. 2 is a schematic diagram of the overall structure of the present application.

[0014] FIG. 3 is a schematic diagram of the overall structure of the present application. Figure 2 FIG. 4 is a schematic diagram of the overall structure of the present application.

[0015] FIG. 5 is a schematic diagram of the overall structure of the present application. Figure 3 FIG. 6 is a schematic diagram of the overall structure of the present application.

[0016] FIG. 7 is a schematic diagram of the overall structure of the present application. Figure 4 FIG. 8 is a schematic diagram of the overall structure of the present application.

[0017] FIG. 9 is a schematic diagram of the overall structure of the present application. Figure 5 FIG. 10 is a schematic diagram of the overall structure of the present application.

[0018] The codes in the drawings are as follows: 1, barrel; 2, scraping barrel; 3, vertical sliding block; 4, vertical sliding groove; 5, transmission cavity; 6, first spring; 7, scraping groove; 8, scraping block; 9, scraping piece; 10, second spring; 11, telescopic sliding rod; 12, wedge ring; 13, transverse groove; 14, displacement block; 15, wedge-shaped groove; 16, collection block; 17, slag collecting groove. DETAILED DESCRIPTION

[0019] The present application is not limited by the following examples, and the specific implementation can be determined according to the technical scheme of the present application and the actual situation.

[0020] In the present application, the relative position relationship of each component is described according to the layout of the drawings attached to the specification, such as the position relationship of front, rear, upper, lower, left, right, etc. is determined according to the layout direction of the drawings attached to the specification. Figure 1

[0021] The present application will be further described below in conjunction with examples and drawings:

[0022] Example 1: as shown in the drawings, the magnetic sleeve scraping device comprises a barrel 1 and a scraping barrel 2, the scraping barrel 2 is transmission connected to the outer side of the middle of the barrel 1, the scraping barrel 2 can slide up and down relative to the barrel 1, a plurality of magnetic scraping assemblies are arranged on the outer side of the scraping barrel 2 along the circumference, the magnetic scraping assembly comprises a scraping block 8 made of permanent magnetic material and a scraping piece 9, a plurality of staggered scraping grooves 7 are arranged on the outer side of the scraping barrel 2, the scraping block 8 is installed on the scraping groove 7, and a plurality of scraping pieces 9 are arranged on the scraping block 8. Figures 1-5 During operation, the barrel 1 can be connected with a drill pipe, a tubing or a coiled tubing to be lowered into the casing, the barrel 1 drives the scraping barrel 2 to move up and down reciprocatingly and spirally to contact the inner wall of the casing, a plurality of scraping pieces 9 move together and continuously scrape the pipe wall, effectively removing soft dirt, sand and other impurities. The present application utilizes the magnetic properties of permanent magnetic material to actively adsorb ferromagnetic materials such as hole burrs and plug debris during the scraping process, and these debris will be directly fixed on the surface of the scraping piece 9 or the scraping block 8 due to the magnetic force after being scraped off, avoiding the pollution of the casing caused by the scattering of the debris again, and significantly improving the debris recovery efficiency and operation cleanliness.

[0023]

[0024] ​​In the process of well repair fluid circulation, high-pressure well repair fluid is injected from the pipe string and flows through the inner wall of the cylinder 1 and then pours out from the bottom of the cylinder 1, carrying the impurities (such as iron filings and magnetic particles) generated by scraping along the gap between the inner wall of the oil pipe and the outer wall of the scraping cylinder 2 to the wellhead. At this time, the permanent magnetic scraping block 8 on the outside of the scraping cylinder 2 and the scraping sheet 9 continuously exert magnetic adsorption effect. The ferromagnetic impurities in the flowing well repair fluid that are not initially adsorbed will be captured and fixed on the surface of the scraping sheet 9 and the scraping block 8 due to the magnetic force when flowing through the surface of the scraping sheet 9 and the scraping block 8, significantly reducing the impurity content in the flowback fluid and further reducing the probability of flowback fluid plugging. The magnetic design of the scraping sheet 9 and the scraping block 8 forms a double cleaning mechanism of "scraping and peeling - initial adsorption - cyclic re-adsorption", which not only avoids the plugging of the filtering equipment after the ferromagnetic impurities return to the ground with the well repair fluid, reducing the subsequent flowback fluid treatment cost, but also prevents the deposition of unremoved impurities on the bottom of the casing or adhesion to the pipe wall, effectively improving the thoroughness and efficiency of the well repair operation.

[0025] According to actual needs, the above-mentioned magnetic casing scraping device can be further optimized or / and improved:

[0026] Embodiment 2: As shown in the accompanying Figure 3 The elastic connection assembly is provided between the scraping block 8 and the corresponding scraping groove 7, and includes a second spring 10 and an extension slide rod 11. The extension slide rod 11 and the second spring 10 are installed between the scraping block 8 and the bottom of the scraping groove 7, and the second spring 10 is sleeved on the outside of the extension slide rod 11.

[0027] When the scraping sheet 9 moves with the scraping cylinder 2 and contacts the impurities on the inner wall of the casing, if it encounters hard scaling or metal burrs, etc. resistance, the scraping sheet 9 and the scraping block 8 will slide along the extension slide rod 11 into the scraping groove 7 and compress the second spring 10. The elastic deformation of the second spring 10 effectively absorbs the impact energy, avoiding the cracking of the scraping sheet 9 due to rigid impact, while reducing the friction damage between the scraping groove 7 and the scraping block 8, prolonging the service life of the components. In addition, this elastic sliding mechanism gives the scraping block 8 dynamic adjustment capability: facing different thickness of impurity layers (such as local thick scaling or thin sand accumulation) in the casing, the scraping block 8 can automatically adjust the extension amount through the extension and retraction of the second spring 10, that is, the thick impurity layer pushes the scraping block 8 to compress the spring, keeping the scraping sheet 9 in effective contact with the impurities; the thin impurity layer pushes the scraping block 8 to extend out by the rebound force of the second spring 10, ensuring that the scraping sheet 9 is tightly attached to the pipe wall, realizing comprehensive coverage and scraping of impurities of different thickness, and significantly improving the operation adaptability and cleaning efficiency.

[0028] Embodiment 3: As shown in the accompanying Figure 4As shown, the scraping cylinder 2 is provided with a plurality of through horizontal grooves 13, and the displacement block 14 is arranged in the horizontal groove 13 and can slide radially along the scraping cylinder 2. The outer side of the displacement block 14 is provided with the scraping groove 7 which is open outward. The inner wall of the displacement block 14 is a wedge-shaped groove 15 with a large upper inner diameter and a small lower inner diameter. The outer wall of the cylinder body 1 is provided with a wedge ring 12 with a large upper outer diameter and a small lower outer diameter. The outer side of the wedge ring 12 is matched with the inner side of the wedge-shaped groove 15.

[0029] When the scraping piece 9 contacts the hard impurities (such as calcified scale and metal burr) on the inner wall of the sleeve, if the scraping resistance is large, the scraping cylinder 2 is pushed to slide upward relative to the cylinder body 1. At this time, the wedge ring 12 on the side wall of the cylinder body 1 slides downward relative to the wedge-shaped groove 15 of the displacement block 14. When the wedge ring 12 moves downward, the displacement block 14 is pushed to extend outward radially along the cylinder body 1, and the scraping groove 7 and the scraping block 8 are synchronously moved outward, so as to shorten the distance between the scraping piece 9 and the inner wall of the sleeve and compress the maximum elastic displacement space of the second spring 10. The scraping piece 9 acts on the impurity surface in a more rigid contact state, and the cutting force of single scraping is significantly improved. The scraping capacity can be automatically enhanced according to the real-time scraping resistance without manually increasing the number of reciprocations or planning a complex process in advance. Especially for hard impurities, the dynamic response of “increasing force when encountering resistance” is realized, which not only improves the operation efficiency, but also avoids the equipment damage caused by excessive reciprocation, and effectively solves the problem of poor adaptability of the traditional scraper.

[0030] Embodiment 4: as shown in the accompanying Figure 2 As shown, the inner side of the upper part of the scraping cylinder 2 is provided with a plurality of vertical sliding grooves 4. The cylinder body 1 is provided with mounting holes corresponding to the positions of the vertical sliding grooves 4. The vertical sliding block 3 is arranged in the vertical sliding groove 4. The inner end of the vertical sliding block 3 is located in the mounting hole. The transmission cavity 5 is arranged between the outer wall of the cylinder body 1 and the inner wall of the scraping cylinder 2 at the upper part. The first spring 6 is arranged in the transmission cavity 5.

[0031] The vertical sliding block 3, the vertical sliding groove 4 and the mounting hole are arranged to drive connect the cylinder body 1 and the scraping cylinder 2. The cylinder body 1 can drive the scraping cylinder 2 to move up and down and rotate. The first spring 6 is arranged to provide a reset force for the relative sliding of the scraping cylinder 2 and the cylinder body 1. The elastic buffer of the first spring 6 makes the relative sliding process of the scraping cylinder 2 and the cylinder body 1 more stable, and avoids the damage of components caused by rigid collision.

[0032] Embodiment 5: as shown in the accompanying Figure 5 As shown, the lower part of the scraping cylinder 2 is provided with a plurality of slag collecting grooves 17 which are open downward. The slag collecting grooves 17 are staggered with the lower magnetic scraping assembly. The hollow collecting block 16 is arranged at the lower end of the cylinder body 1. The upper part and the lower part of the collecting block 16 are both tapered structures. When the lower side of the scraping cylinder 2 is located at the upper side of the collecting block 16, the lower end opening of the slag collecting groove 17 can be covered.

[0033] The collecting block 16 is closely attached to the bottom end of the scraping cylinder 2 in normal state, so that the slag collecting groove 17 on the side wall of the scraping cylinder 2 is in a closed state, and the workover fluid backflow flows along the side wall of the collecting block 16 outside the scraping cylinder 2, only carrying small-particle-size impurities back to the well; when the scraping cylinder 2 is relatively displaced with the cylinder body 1 due to the resistance of hard impurities, the collecting block 16 is synchronously separated from the bottom end of the scraping cylinder 2, and the originally closed slag collecting groove 17 is exposed, at this time, the workover fluid backflow path is changed, that is, large-particle-size impurities (such as blocky scale and bridge plug fragments) cannot pass through the gap between the scraping cylinder 2 and the casing, and are guided into the slag collecting groove 17 by the conical structure above and below the collecting block 16. The dynamic collecting mechanism does not need additional power, and the slag collecting groove 17 is opened by the natural displacement in the scraping process, effectively solving the problem of large-particle-size impurities remaining in the well, avoiding secondary interference of impurities on subsequent scraping operations, reducing workover fluid consumption caused by repeated flushing, and significantly improving the cleanliness and efficiency of downhole operations. The scraping blocks 8 and scraping blades 9 with magnetism can produce magnetic attraction to the side wall of the slag collecting groove 17, so that the impurities entering the slag collecting groove 17 are more closely adsorbed on the groove wall, reducing secondary falling caused by liquid disturbance, improving the capture efficiency of the slag collecting groove 17 for magnetic impurities, avoiding interference of impurities with the scraping in the well, and reducing the difficulty of impurity separation after workover fluid backflow, further strengthening the cleaning effect and reliability of downhole operations.

[0034] The above technical features respectively constitute embodiments of the present application, which have strong adaptability and implementation effect, and unnecessary technical features can be added or reduced according to actual needs to meet the needs of different situations.

Claims

1. A magnetic cannula skiving device, characterized by The utility model relates to a magnetic scraping device, including cylinder, scraping cylinder, transmission connection has scraping cylinder in the middle part of cylinder outer side, scraping cylinder can slide up and down relative to cylinder, and the outer side of scraping cylinder is equipped with a plurality of magnetic scraping components along the circumference, and the magnetic scraping component includes the shaving block made of permanent magnet material and the scraper, and the outer side of scraping cylinder is equipped with a plurality of staggered scraping grooves, and the shaving block is installed on the scraping groove, and a plurality of scrapers are arranged on the shaving block, and the elastic connecting component is arranged between the shaving block and the corresponding scraping groove, and the elastic connecting component includes the second spring and the telescopic slide rod, and the telescopic slide rod and the second spring are installed between the shaving block and the groove bottom of scraping groove, and the second spring is sleeved on the telescopic slide rod, and the scraping cylinder is equipped with a plurality of inner and outer through horizontal grooves, and the horizontal groove is equipped with the displacement block that can slide along the radial direction of scraping cylinder, and the outer side of displacement block is equipped with the scraping groove that opens outward, and the inner wall of displacement block is the wedge-shaped groove of the big lower inner diameter of the upper inner diameter, and the outer wall of cylinder is equipped with the wedge ring of the big lower outer diameter of the upper outer diameter, and the outer side of wedge ring is matched with the inner side of wedge-shaped groove, The lower part of scraping cylinder is equipped with a plurality of slag collecting grooves that open downward, and the slag collecting groove is staggered with the lower magnetic scraping component, and the hollow collecting block is installed at the lower end of cylinder, and the upper part and the lower part of collecting block are both tapered structures, and the lower side of scraping cylinder can cover the lower end opening of slag collecting groove when being located on the upper side of collecting block.

2. The magnetic cannula shaving device of claim 1, wherein The inner side of the upper part of scraping cylinder is equipped with a plurality of vertical sliding grooves, and the cylinder is equipped with mounting holes corresponding to the position of vertical sliding groove, and the vertical sliding block is installed in the vertical sliding groove, and the inner end of vertical sliding block is located in the mounting hole, and the transmission cavity is arranged between the outer wall of cylinder and the inner wall of scraping cylinder in the upper part, and the first spring is installed in the transmission cavity, and the reset force is provided for the relative sliding of scraping cylinder and cylinder.

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