A casing floating collar structure

Abstract

The present invention provides a casing floating collar structure, belonging to the field of floating collars, including an outer casing, wherein a first shoulder pad is arranged inside the outer casing, a ring frame is fixedly connected under the first shoulder pad, and a first annular magnetic block is arranged in a ring shape on the ring frame; an inner casing, which is arranged inside the outer casing, and the bottom of the inner casing abuts against the first shoulder pad. Through the arranged debris filtering and collecting assembly, the present invention can achieve layered filtering and blocking of the debris after the rupture disc is broken, and limit this part of the debris so that it cannot enter the lower valve or other structures through this collar. After pulling out this collar, the internal debris can be emptied through the separation assembly and the debris discharging assembly, which is convenient for cleaning and the reuse of this collar, reduces the use risk of this collar after the rupture disc is broken, and also reduces the use cost through the recyclable collar.

Description

Technical Field

[0001] The present invention relates to the technical field of floating collars, and particularly to a casing floating collar structure. Background Art

[0002] In petroleum engineering, the application of casing floating collars stems from the urgent need for safe and efficient lowering of casings under complex well conditions. As oil and gas exploration extends to deep formations, long-reach horizontal wells, and marine environments, traditional casing-lowering techniques face multiple challenges: a sharp increase in frictional resistance; in long horizontal sections or high-curvature wellbores, the friction between the casing and the wellbore easily leads to pipe sticking and even fracture accidents. The floating collar closes the bottom of the pipe string, uses the buoyancy of the drilling fluid to offset part of the casing's own weight, effectively reduces the axial load of the pipe string, and greatly reduces frictional losses. When the casing is lowered, violent vibrations may damage the fragile formation structure and cause wellbore collapse. The buoyancy assistance of the collar enables the pipe string to enter the well smoothly with a lower traction force, reducing mechanical disturbance to the formation.

[0003] A type of existing floating collar achieves casing floating by having a rupture disk inside. To reduce the frictional resistance when the casing enters the well, the rupture disk seals oil, gas, or liquid with the casing to increase the volume of the displaced liquid when it enters the well, thereby increasing the buoyancy of the casing entering the well, and further reducing the normal pressure on the wellbore, thus reducing frictional resistance. When liquid needs to be injected into the casing, a pump is connected to the end of the casing, and by pressurizing to reach the maximum pressure at which the rupture disk breaks, the rupture disk breaks, thus connecting the upper and lower casings. In the floating collar, the rupture disk structure is simple and effective, and the economic cost of use is relatively low, suitable for most common oil wells. However, currently, after the rupture disk of the rupture disk type floating collar breaks, the fragments will disperse inside the casing. Although they can be flushed out by pressurized injection of liquid, some fine fragments are easily stuck in various positions, such as valves, interfaces, etc. Long-term use will cause internal wear of this type of structure, resulting in damage and production risks.

[0004] Therefore, we propose a casing floating collar structure to solve the problems encountered above. Summary of the Invention

[0005] Aiming at the deficiencies of the existing technology, the present invention provides a casing floating collar structure to solve the problems raised in the above background art.

[0006] The object of the present invention can be achieved by the following technical solutions: It includes an outer casing, a first shoulder is arranged inside the outer casing, a ring frame is fixedly connected under the first shoulder, and first annular magnets are arranged annularly on the ring frame;

[0007] Inner sleeve, the inner sleeve is arranged inside the outer sleeve, the bottom of the inner sleeve abuts against the first shoulder, an installation groove is formed at the top of the inner sleeve, a horizontal groove is formed on one side of the outer side of the inner sleeve and is equally spaced from top to bottom, an inclined groove is formed on the horizontal side of the horizontal groove, and a second shoulder is fixedly connected inside the inner sleeve;

[0008] Sealing assembly, the sealing assembly includes a rupture disk arranged in the installation groove, a lower sealing ring is also arranged outside the rupture disk and in the installation groove, the top end of the inner sleeve is threadedly connected with a gland, an outer edge portion is arranged on the gland, and an upper sealing ring is arranged on the outer edge portion;

[0009] Debris filtering and collecting assembly, the debris filtering and collecting assembly includes a filter housing arranged inside the inner sleeve, the filter housing has three layers from top to bottom, a first connecting column is fixedly connected between adjacent two layers of filter housings, a thin portion is arranged outside the filter housing, a blocking portion is arranged at the bottom of each layer of filter housing, a filtering arc plate is fixedly connected to the top of each layer of filter housing, an adsorption rack is arranged inside each layer of filter housing, a second annular magnet is fixedly connected to the outside of the adsorption rack, and a second connecting column is fixedly connected between adjacent adsorption racks;

[0010] Separation assembly, the separation assembly includes a support frame threadedly connected to the lower side inside the inner sleeve, a cushion portion is fixedly connected to the top of the support frame, the cushion portion abuts against the blocking portion of the lowermost layer of filter housing, a first spring is arranged inside the support frame, and the top end of the first spring abuts against the bottom of the lowermost layer of adsorption rack.

[0011] As a preferred embodiment of the present invention, a limiting assembly is further included, the limiting assembly includes an L-shaped frame fixedly connected to the lower side of the inner sleeve and distributed in a ring shape, a limiting block is slidably connected to the lower side of the L-shaped frame, a tension spring is arranged between the limiting block and the vertical side of the adjacent L-shaped frame, the limiting block is magnetically attracted to the adjacent first annular magnet, a limiting ring is slidably connected to the upper inner side of the outer sleeve, arc grooves are symmetrically formed on the limiting ring, and upper pulling frames are symmetrically fixed to the top of the gland.

[0012] As a preferred embodiment of the present invention, a debris discharging assembly is further included, the debris discharging assembly includes a second spring arranged in the horizontal groove, a sealing block is slidably connected in the inclined groove, one end of the sealing block abuts against one end of the adjacent second spring, and a same vertical pulling plate is fixedly connected to the outside of a plurality of sealing blocks.

[0013] As a preferred embodiment of the present invention, the cross section of the inclined groove is trapezoidal, with the long side close to the inner side of the inner sleeve and the short side close to the outer side, and grooves are further formed outside a plurality of inclined grooves, and the vertical pulling plate moves in the grooves.

[0014] As a preferred embodiment of the present invention, a foot pad is fixedly connected to the bottom of the adsorption rack in a circular shape, and the bottom contour of the foot pad is adapted to the top contour of the filtering arc plate.

[0015] As a preferred embodiment of the present invention, a downward pulling rack is fixedly arranged in a circular shape on the inner side of the lowermost adsorption rack.

[0016] As a preferred embodiment of the present invention, through holes are formed in a circular shape at the connection between the filtering shell and the adjacent filtering arc plate, and the inner diameter of the through holes is adapted to the outer diameter of the second connecting column.

[0017] As a preferred embodiment of the present invention, the filtering shell and the adjacent first connecting column are integrally formed, and the combination of the filtering shell and the first connecting column is composed of three completely equal parts.

[0018] As a preferred embodiment of the present invention, connection parts are arranged at the top and bottom of the outer sleeve pipe, and connection threads are respectively machined on the outer sides of the connection parts.

[0019] As a preferred embodiment of the present invention, filter holes are evenly distributed on the filtering arc plate and the filtering shell, and from top to bottom, the inner diameters of the filter holes on the filtering arc plate and the filtering shell decrease in sequence. Preferably,

[0020] Compared with the prior art, the beneficial effects of the present invention are as follows:

[0021] 1. Through the arranged debris filtering and collecting assembly, after the rupture disc is broken, the broken debris can be filtered and blocked in layers, and the part of the debris can be limited, so that it cannot enter the lower valve or other structures through the coupling. After pulling out the coupling, the internal debris can be dumped through the separation assembly and the debris discharging assembly, which is convenient for cleaning and the reuse of the coupling, reduces the use risk of the coupling after the rupture disc is broken, and also reduces the use cost through the recyclable coupling.

[0022] 2. Through the arranged structures such as the limiting assembly, the quick installation and disassembly operations of the inner sleeve pipe and the outer sleeve pipe can be realized, which is beneficial to improving the operation speed and reducing the operation complexity in the operation of removing the inner sleeve pipe.

[0023] 3. Through the arranged sealing assembly, when the coupling is moved, the force conduction effect caused by the rigid connection between the rupture disc and the inner sleeve pipe can be weakened, so that the risk of premature breakage of the rupture disc after the coupling is shaken can be reduced, and the stability and reliability of the coupling during use are improved. Description of the Drawings

[0024] For the convenience of those skilled in the art to understand, the present invention will be further described below with reference to the accompanying drawings.

[0025] Figure 1 is a schematic three-dimensional sectional view of the present invention;

[0026] Figure 2 is a schematic three-dimensional (hiding the outer sleeve) view of the present invention;

[0027] Figure 3 is a schematic three-dimensional (hiding the outer sleeve) view of another perspective of the present invention;

[0028] Figure 4 is a schematic partial sectional view of the present invention;

[0029] Figure 5 is a schematic view of a part (hiding the outer sleeve and the inner sleeve) of the present invention;

[0030] Figure 6 is a schematic three-dimensional structure view of the filter housing and the first connecting column in the present invention;

[0031] Figure 7 is a schematic three-dimensional structure view of the adsorption rack and the second connecting column in the present invention;

[0032] Figure 8 is Figure 4 an enlarged view of part A shown in;

[0033] Figure 9 is Figure 4 an enlarged view of part B shown in.

[0034] Figure 10 is Figure 6 an enlarged view of part C shown in;

[0035] Figure 11 is Figure 4 an enlarged view of part D shown in.

[0036] In the figure: 1. Outer sleeve; 2. Inner sleeve; 3. Annular rack; 4. First annular magnet; 5. Installation groove; 6. Horizontal groove; 7. Pouring groove; 8. Second shoulder; 9. Rupture disk; 10. Lower sealing ring; 11. Pressing cover; 111. Outer edge part; 112. Upper pulling rack; 12. Upper sealing ring; 13. Filter housing; 131. Thin part; 132. Blocking part; 14. Filter arc plate; 15. Adsorption rack; 151. Pad foot; 152. Lower pulling rack; 16. Second annular magnet; 17. Second connecting column; 18. First connecting column; 19. Support frame; 20. Pad part; 21. First spring; 22. L-shaped rack; 23. Limit block; 24. Tension spring; 25. Second spring; 26. Sealing block; 27. Vertical pulling plate; 28. Groove; 29. Limit ring; 291. Arc groove; 30. Through hole; 31. Connecting part; 32. First shoulder. Detailed implementation manners

[0037] The technical solution of the present invention will be clearly and completely described below in conjunction with the embodiments. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present invention without creative work belong to the scope of protection of the present invention.

[0038] Please refer to Figures 1 - 11 As shown, a floating collar structure for a casing includes an outer casing 1. A first shoulder 32 is arranged inside the outer casing 1. A ring frame 3 is fixedly connected below the first shoulder 32. A first annular magnet 4 is arranged in a ring shape on the ring frame 3;

[0039] It should be noted that the first shoulder 32 is used to position the inner casing 2 when it is installed inside the outer casing 1 to ensure its proper installation. A connection groove for the first annular magnet 4 is provided on the ring frame 3 to facilitate the installation of the first annular magnet 4.

[0040] An inner casing 2 is arranged inside the outer casing 1. The bottom of the inner casing 2 abuts against the first shoulder 32. An installation groove 5 is provided at the top of the inner casing 2. A horizontal groove 6 is provided on one side of the outer side of the inner casing 2 and is equally spaced from top to bottom. An inclined groove 7 is provided on the horizontal side of the horizontal groove 6. A second shoulder 8 is fixedly connected inside the inner casing 2;

[0041] It should be noted that the installation groove 5 is used to accommodate and limit the rupture disk 9. The horizontal groove 6 is used to facilitate the installation of the second spring 25. After the second spring 25 is installed in place, the horizontal groove 6 is sealed by an outer baffle on the outside to prevent liquid leakage. A concave deep groove is provided at one end of the inclined groove 7. The concave deep groove is used to cooperate with the end of the sealing block 26 so that the sealing block 26 can completely seal the inclined groove 7 under the action of the second spring 25 to avoid affecting the internal sealing effect during the normal operation of the collar. The second shoulder 8 is used to pre-position the installation position of the filter housing 13 inside the inner casing 2.

[0042] A sealing assembly includes a rupture disk 9 arranged in the installation groove 5. A lower sealing ring 10 is also arranged outside the rupture disk 9 and inside the installation groove 5. The top end of the inner casing 2 is threadedly connected with a gland 11. An outer edge portion 111 is provided on the gland 11. An upper sealing ring 12 is provided on the outer edge portion 111;

[0043] It should be noted that in order to ensure that the fragments of the rupture disc 9 are small enough during rupture, pre-cracking grooves are etched on the surface of the rupture disc 9 to reduce the fragment area after its fragmentation and prevent the fragments from blocking the liquid flow. At the same time, the rupture disc 9 should be made of an alloy containing ferromagnetic material so that its fragments can be adsorbed and fixed by the second annular magnet 16 to avoid random movement of the fragments. The lower sealing ring 10 and the upper sealing ring 12 are both made of flexible materials such as rubber to reduce the force conduction effect of the inner sleeve 2 on the rupture disc 9 and prevent it from being prematurely broken due to vibration during movement. The gland 11 is used to limit the upper part of the rupture disc 9 to prevent it from detaching from the inner sleeve 2. The outer edge part 111 is used to facilitate the installation of the upper sealing ring 12 and prevent the separation of the upper sealing ring 12 from the gland 11, ensuring the stability of the structure after installation. By setting the sealing component, when moving the collar, the force conduction effect caused by the rigid connection between the rupture disc 9 and the inner sleeve 2 can be weakened, thereby reducing the risk of premature fragmentation of the rupture disc 9 after the collar is shaken, and improving the stability and reliability of the collar during use.

[0044] The fragment filtering and collecting component includes a filter housing 13 arranged inside the inner sleeve 2. The filter housing 13 has three layers from top to bottom. A first connecting column 18 is fixedly connected between adjacent two layers of the filter housing 13. A thin part 131 is arranged outside the filter housing 13. A blocking part 132 is arranged at the bottom of each layer of the filter housing 13. A filtering arc plate 14 is fixedly connected to the top of each layer of the filter housing 13. An adsorption rack 15 is arranged inside each layer of the filter housing 13. A second annular magnet 16 is fixedly connected to the outside of the adsorption rack 15. A second connecting column 17 is fixedly connected between adjacent adsorption racks 15;

[0045] It should be noted that a thin part 131 is provided on the filter housing 13. After assembly, the second annular magnet 16 on the adsorption frame 15 with the second annular magnet 16 will be at the same height as the thin part 131 on the filter housing 13. By means of the thin wall, the adsorption effect of the second annular magnet 16 on the debris outside the filter housing 13 is increased. Furthermore, it is convenient to adsorb the debris after the rupture disc 9 is broken at the recess of the thin part 131, restricting the movement of the debris and also facilitating subsequent unified dumping treatment. At the same time, the thin part 131 can also weaken the water flow flushing effect, further preventing the debris from moving randomly. The blocking part 132 is used to cooperate with the inner wall of the inner sleeve 2 to seal this place, ensuring that only liquid can pass through, while it is difficult for the debris after the rupture disc 9 is broken to pass through. The filtering arc plate 14 can make the debris fall and be washed out along the arc surface to the outside through its arc-shaped outer contour, preventing it from blocking the normal flow of the liquid, reducing the blocking effect of the debris on the liquid, and increasing the liquid flowable area during liquid injection. The adsorption frame 15 is used to install the second annular magnet 16 and can shield it at the same time to prevent the liquid from contacting the second annular magnet 16. By providing the debris filtering and collecting assembly, after the rupture disc 9 is broken, the debris after the breakage can be filtered and blocked in layers, and the part of the debris can be limited in position so that it cannot enter the lower valve or other structures through this coupling.

[0046] Separation assembly, the separation assembly includes a support frame 19 threadedly connected to the lower side inside the inner sleeve 2. The top of the support frame 19 is fixedly connected with a cushion part 20, and the cushion part 20 abuts against the blocking part 132 of the lowermost filter housing 13. A first spring 21 is arranged inside the support frame 19, and the top end of the first spring 21 abuts against the bottom of the lowermost adsorption frame 15.

[0047] It should be noted that the support frame 19 is used to limit the bottom of the filter housing 13 after the filter housing 13 is installed in the inner sleeve 2, so that the filter housing 13 cannot move inside the inner sleeve 2. The cushion part 20 is used to increase the support effect on the bottom of the filter housing 13 and improve the support stability. The first spring 21 is used to enable the adsorption frame 15 to be completely restricted inside the filter housing 13, preventing it from moving randomly, and at the same time ensuring the relative position between the thin part 131 and the adjacent second annular magnet 16.

[0048] In this embodiment, the limiting component includes an L-shaped frame 22 fixedly connected to the lower side of the inner sleeve 2 and distributed in a ring shape. A limiting block 23 is slidably connected to the lower side of the L-shaped frame 22. A tension spring 24 is arranged between the limiting block 23 and the vertical side of the adjacent L-shaped frame 22. The limiting block 23 is magnetically attracted to the adjacent first annular magnet 4. A limiting ring 29 is slidably connected to the upper inner side of the outer sleeve 1. Arc-shaped grooves 291 are symmetrically formed in the limiting ring 29. Upper pulling frames 112 are symmetrically fixed to the top of the gland 11. The L-shaped frame 22 is used to facilitate the installation of the limiting block 23 and the tension spring 24. The tension spring 24 always generates a pulling effect on the limiting block 23 towards the side close to the L-shaped frame 22. The arc-shaped grooves 291 can facilitate the passing of the upper pulling frames 112 and avoid interference after the limiting ring 29 is pressed in. A guiding groove is arranged on the upper inner side of the outer sleeve 1. By arranging a guiding protrusion on the outer side of the limiting ring 29 that cooperates with the guiding groove, the moving mode of the limiting ring 29 in the outer sleeve 1 is restricted. At the same time, by adjusting the cooperation requirements of the guiding groove and the guiding protrusion, it is difficult for the limiting ring 29 to move after being inserted into the outer sleeve 1, so as to ensure its stability after installation. Through the arrangement of structures such as the limiting component, the rapid installation and disassembly operations of the inner sleeve 2 and the outer sleeve 1 can be realized. In the operation of removing the inner sleeve 2, it is beneficial to improve the operation speed and reduce the operation complexity.

[0049] In this embodiment, the debris discharging component includes a second spring 25 arranged in the transverse groove 6. A sealing block 26 is slidably connected in the dumping groove 7. One end of the sealing block 26 abuts against one end of the adjacent second spring 25. The outer sides of a plurality of sealing blocks 26 are fixedly connected to the same vertical pulling plate 27. The second spring 25 is used to ensure that the sealing block 26 is always tightly pressed in the dumping groove 7 to ensure the sealing effect of the dumping groove 7. When it is necessary to move the sealing block 26, the vertical pulling plate 27 can be acted on to drive a plurality of sealing blocks 26 to move synchronously at the same time, so as to simultaneously release the sealing of a plurality of dumping grooves 7, which is convenient for operation and reduces the operation complexity. The dumping of internal debris can be realized through the separation component and the debris discharging component, which is convenient for cleaning and the reuse of the coupling, reduces the use risk of the coupling after the rupture disc 9 is broken, and also reduces the use cost through the recyclable coupling.

[0050] In this embodiment, the cross-section of the dumping groove 7 is trapezoidal, with the long side close to the inner side of the inner sleeve 2 and the short side close to the outer side. Grooves 28 are also formed outside a plurality of dumping grooves 7. The vertical pulling plate 27 moves in the grooves 28. The grooves 28 are used to facilitate the movement of the vertical pulling plate 27 and accommodate it at the same time, avoiding it protruding from the outer side of the inner sleeve 2.

[0051] In this embodiment, a foot pad 151 is fixedly connected to the bottom of the adsorption frame 15 in a circular shape. The bottom contour of the foot pad 151 is adapted to the top contour of the filtering arc plate 14. The foot pad 151 can facilitate the bottom foot pad 151 to contact the top of the lower filtering arc plate 14 when pulling the adsorption frame 15 downward, effectively support it, increase the contact area during support, reduce the pressure, and also avoid damaging the surface of the filtering arc plate 14.

[0052] In this embodiment, a downward pull frame 152 is fixedly arranged in a circular shape inside the lowermost adsorption frame 15. The downward pull frame 152 can facilitate pulling the entire adsorption frame 15 downward when needed, facilitating operation.

[0053] In this embodiment, through holes 30 are formed in a circular shape at the connection between the filter housing 13 and the adjacent filtering arc plate 14. The inner diameter of the through holes 30 is adapted to the outer diameter of the second connecting column 17. The through holes 30 can facilitate the passage of the second connecting column 17, avoid interference, and at the same time facilitate sealing the connection between the filtering arc plate 14 and the filter housing 13 in cooperation with the second connecting column 17.

[0054] In this embodiment, the filter housing 13 and the adjacent first connecting column 18 are integrally formed. The combination of the filter housing 13 and the first connecting column 18 is composed of three completely equal parts. The filter housing 13 is designed in a split manner, facilitating the installation of the filter housing 13 and the filtering arc plate 14 outside the adsorption frame 15, and reducing the overall installation difficulty of the collar.

[0055] In this embodiment, connection parts 31 are arranged at both the top and bottom of the outer sleeve 1. Connecting threads are respectively machined on the outer sides of the connection parts 31. The connection parts 31 can facilitate the connection and fixation of the outer sleeve 1 to the casing in the oil well. Calculate in advance the location with the maximum friction resistance after the casing is lowered into the well, and install this collar between two sections of the casing at the location with the maximum friction resistance to reduce the frictional resistance when the casing is lowered into the well.

[0056] In this embodiment, filter holes are evenly distributed on the filtering arc plate 14 and the filter housing 13, and from top to bottom, the inner diameters of the filter holes on the filtering arc plate 14 and the filter housing 13 decrease in sequence. The filter holes can facilitate the passage of liquid, and at the same time limit the passage of the fragments after the rupture disk 9 breaks. The fragments are stacked in layers through the continuously decreasing filter holes, avoiding the fragments being stacked on the same layer and affecting the liquid drainage effect.

[0057] When the present invention is specifically used and it is necessary to install the floating collar, first insert the rupture disk 9 into the installation groove 5 on the inner casing 2 to press it into the lower sealing ring 10. Then rotate and insert the gland 11 with the upper sealing ring 12 into the top of the inner casing 2 to make the upper sealing ring 12 be in extrusion connection with the rupture disk 9. Then insert the inner casing 2 into the outer casing 1, and slow down its descending speed in the outer casing 1 by pulling the upper pull frame 112. At the same time, rotate the inner casing 2 to align the limiting block 23 at the bottom thereof with one of the first annular magnets 4. When the bottom of the inner casing 2 contacts the first shoulder 32, the limiting block 23 pulls the tension spring 24 to elongate under the adsorption action of the adjacent first annular magnet 4 until one side surface thereof is adsorbed to the first annular magnet 4. Then push the limiting ring 29 along the guiding groove, so that the upper pull frame 112 passes through the arc-shaped groove 291 and at the same time makes the limiting ring 29 be pushed in place. Then connect the two connecting parts 31 of the outer casing 1 to different casings in the oil well respectively, and increase the buoyancy after the casing is lowered into the well through the closed space formed by this collar and the upper casing to reduce the frictional resistance. Then, before grouting in the casing, connect the top of the casing to the pump to pressurize the inside of the casing until the pressure reaches the maximum pressure that the rupture disk 9 can withstand. At this time, the rupture disk 9 breaks, and the broken pieces are scattered on the upper filtering arc-shaped plate 14 and the filtering shell 13. Then connect the casing to the liquid injection pipe, and the liquid enters this collar through the casing. The high-speed flowing liquid continuously flushes the debris on the uppermost layer, so that some debris with smaller diameters enter the lower two layers through the filter holes. When the debris slides downward from the filtering arc-shaped plate 14 to the outside, it will be adsorbed by the internal second annular magnet 16 and stay at the thin part 131 outside the filtering shell 13 of this layer, while the liquid can normally pass through the filtering arc-shaped plate 14 and enter the next casing. When it is necessary to clean the debris in this collar and re-place the rupture disk 9, first pull the limiting ring 29 upward forcefully to separate it from the outer casing 1. Then hold the upper pull frame 112 and rotate it to make the inner casing 2 rotate in the outer casing 1. After the first annular magnet 4 and the limiting block 23 are no longer in contact, the limiting block 23 resets under the action of the tension spring 24 and no longer blocks below the first shoulder 32. At this time, hold the upper pull frame 112 and take out the inner casing 2 as a whole from the outer casing 1. Then make the side surface of the inner casing 2 contact the ground, and slowly roll the inner casing 2 until the dumping groove 7 is facing the ground. Pull the plurality of sealing blocks 26 to move by the vertical pulling plate 27, compress the second spring 25 to shorten, and pull the lower pull frame 152 to one side to drive the adsorption frame 15 and the second annular magnet 16 to move until the pad foot 151 contacts the filtering arc-shaped plate 14. At this time, the debris in the thin part 131 is no longer adsorbed and falls downward from the opened dumping groove 7 under the action of gravity. Then place the inner casing 2 upright with the gland 11 upward, rotate the gland 11 to separate it from the inner casing 2, and then take out the remaining annular rupture disk 9. Put a new rupture disk 9 in the installation groove 5, and then operate in the same way as above, and this collar can be reused.

[0058] The preferred embodiments of the present invention disclosed above are only used to help illustrate the present invention. The preferred embodiments do not describe all the details in detail, nor do they limit the invention to only the specific embodiments. Obviously, according to the content of this specification, many modifications and changes can be made. These embodiments are selected and specifically described in this specification in order to better explain the principles and practical applications of the present invention, so that those skilled in the art can well understand and utilize the present invention. The present invention is only limited by the claims and their full scope and equivalents.

Claims

1. A floating casing collar structure, characterized in that, Comprising: An outer sleeve (1), a first shoulder pad (32) is arranged inside the outer sleeve (1), a ring frame (3) is fixedly connected under the first shoulder pad (32), and a first annular magnet (4) is arranged in a ring on the ring frame (3); An inner sleeve (2), the inner sleeve (2) is arranged inside the outer sleeve (1), the bottom of the inner sleeve (2) abuts against the first shoulder pad (32), an installation groove (5) is opened at the top of the inner sleeve (2), a horizontal groove (6) is opened on one side of the outer side of the inner sleeve (2), and is equally spaced from top to bottom, an inclined groove (7) is opened on the horizontal side of the horizontal groove (6), and a second shoulder pad (8) is fixedly connected inside the inner sleeve (2); A sealing assembly, the sealing assembly includes a rupture disk (9) arranged in the installation groove (5), a lower sealing ring (10) is also arranged outside the rupture disk (9) and inside the installation groove (5), the top end of the inner sleeve (2) is threadedly connected with a gland (11), an outer edge portion (111) is arranged on the gland (11), and an upper sealing ring (12) is arranged on the outer edge portion (111); A debris filtering and collecting assembly, the debris filtering and collecting assembly includes a filter housing (13) arranged inside the inner sleeve (2), the filter housing (13) has three layers from top to bottom, a first connecting column (18) is fixedly connected between adjacent two layers of the filter housing (13), a thin portion (131) is arranged outside the filter housing (13), a blocking portion (132) is arranged at the bottom of each layer of the filter housing (13), a filtering arc plate (14) is fixedly connected to the top of each layer of the filter housing (13), an adsorption frame (15) is arranged inside each layer of the filter housing (13), a second annular magnet (16) is fixedly connected to the outside of the adsorption frame (15), and a second connecting column (17) is fixedly connected between adjacent adsorption frames (15); A separation assembly, the separation assembly includes a support frame (19) threadedly connected to the lower side inside the inner sleeve (2), a cushion portion (20) is fixedly connected to the top of the support frame (19), the cushion portion (20) abuts against the blocking portion (132) of the lowermost layer of the filter housing (13), a first spring (21) is arranged inside the support frame (19), and the top end of the first spring (21) abuts against the bottom of the lowermost layer of the adsorption frame (15).

2. The floating collar structure of a casing according to claim 1, wherein, It further includes a limiting assembly, the limiting assembly includes an L-shaped frame (22) fixedly connected to the lower side of the inner sleeve (2), and is annularly distributed, a limiting block (23) is slidably connected under the L-shaped frame (22), a tension spring (24) is arranged between the limiting block (23) and the vertical side of the adjacent L-shaped frame (22), the limiting block (23) is magnetically attracted to the adjacent first annular magnet (4), a limiting ring (29) is slidably connected to the upper inner side of the outer sleeve (1), arc grooves (291) are symmetrically opened on the limiting ring (29), and upper pulling frames (112) are symmetrically fixed to the top of the gland (11).

3. The floating casing collar structure according to claim 2, characterized in that, It further includes a debris discharging component, and the debris discharging component includes a second spring (25) arranged in the transverse groove (6). A sealing block (26) is slidably connected in the tipping groove (7). One end of the sealing block (26) abuts against one end of the adjacent second spring (25). The outer sides of a plurality of sealing blocks (26) are fixedly connected to the same vertical pulling plate (27).

4. A floating collar structure for a casing according to claim 3, characterized in that, The cross-section of the tipping groove (7) is trapezoidal, with the long side close to the inner side of the inner sleeve (2) and the short side close to the outer side. A groove (28) is further formed outside a plurality of tipping grooves (7). The vertical pulling plate (27) is movably arranged in the groove (28).

5. The floating casing collar structure according to claim 4, characterized in that, The bottom of the adsorption rack (15) is fixedly connected with a pad foot (151) in a circular shape. The bottom contour of the pad foot (151) is adapted to the top contour of the filtering arc-shaped plate (14).

6. The floating collar structure of a casing according to claim 5, characterized in that, A downward pulling rack (152) is fixedly arranged in a circular shape inside the lowermost adsorption rack (15).

7. A floating collar structure for a casing according to claim 6, characterized in that, A through hole (30) is formed in a circular shape at the connection between the filter housing (13) and the adjacent filtering arc-shaped plate (14). The inner diameter of the through hole (30) is adapted to the outer diameter of the second connecting column (17).

8. A floating casing collar structure according to claim 7, characterized in that, The filter housing (13) and the adjacent first connecting column (18) are integrally formed. The combination of the filter housing (13) and the first connecting column (18) is composed of three completely equal parts.

9. A floating casing collar structure according to claim 8, wherein, Connection parts (31) are arranged at the top and bottom of the outer sleeve (1). Connecting threads are respectively machined on the outer sides of the connection parts (31).

10. A floating casing collar structure according to claim 9, characterized in that Filter holes are uniformly distributed on the filtering arc-shaped plate (14) and the filter housing (13). From top to bottom, the inner diameters of the filter holes on the filtering arc-shaped plate (14) and the filter housing (13) decrease in sequence.

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