A segmented filling completion device

Abstract

This invention discloses a segmented gravel filling completion device, comprising an outer and an inner filling server. The outer filling server contains a central tube with a filling port. A first sealing component, movable between a first position and a second position, is axially positioned within the central tube. At the first position, the two filling ports completely overlap; at the second position, they are completely offset. A second sealing component is connected to the outside of the central tube wall. In a non-pressurized state, the second sealing component seals the central tube filling port; in a pressurized state, it opens the central tube filling port. The inner filling server includes an inner filling cylinder and an elastic positioning cylinder. When the inner filling server fills into the outer filling server, multiple elastic positioning keys engage with multiple positioning grooves, and the inner filling port coincides with the central tube filling port and the sliding sleeve filling port. This invention enables segmented gravel filling, effectively preventing gravel backflow after filling, and maintaining the inner diameter without shrinkage, which is beneficial for subsequent in-tube operations.

Description

Technical Field

[0001] This invention relates to the field of oil and gas development technology, and in particular to a segmented filling well completion device. Background Technology

[0002] Open-hole gravel packing technology in horizontal wells is one of the more advanced sand control methods and is the dominant technology for completing horizontal wells in loose sandstone reservoirs. However, in long horizontal sections of horizontal wells, sedimentation and sand bridge blockage are very likely to occur during gravel packing, thus prematurely interrupting the gravel packing process. This results in problems such as low gravel packing rate, poor sand control effect, and short sand control life.

[0003] The utility model patent "Anti-Backflow Horizontal Well Gravel Packing Device" (authorized patent number ZL2014208647689), published on June 10, 2015, mainly consists of an upper connector, an upper closing component, a lower closing component, a variable-thread connector, a switch sleeve, and a sealing insert with a filling port on the guide head. For the problem of gravel packing in multi-layer and long horizontal well sections, the current solution is to use a one-stage gravel packing device. However, this type of device has the following main shortcomings: First, the sealing effect is poor; after gravel packing, the filling port cannot be fully closed or cannot be closed tightly, causing gravel backflow. Second, this type of packing device is difficult to position, easily leading to unsuccessful positioning during field construction, affecting the construction progress. Third, this type of packing device has a tubing diameter reduction; the inner diameter at the lower end of the tubing decreases, affecting subsequent tubing re-entry operations.

[0004] Therefore, there is a need to improve the existing technology for filling and completion devices. Summary of the Invention

[0005] In view of this, the purpose of this invention is to provide a segmented gravel filling completion device. The device of this invention can realize segmented gravel filling, implement refined filling, mining, and segmented gravel filling construction requirements, effectively prevent gravel backflow after gravel filling, and the segmented gravel filling does not reduce the inner diameter, which is beneficial to the subsequent in-pipe construction.

[0006] To achieve the above objectives, embodiments of the present invention provide a segmented filling completion device, comprising an external filling server and an internal filling server that can be nested together, wherein...

[0007] An external filling server has a central tube with a central tube filling port. A first sealing component is arranged axially inside the central tube, above the plane of the central tube filling port. The first sealing component includes an elastic split claw and a positioning sleeve connected in sequence. The positioning sleeve has a sleeve filling port and multiple positioning grooves on its surface. The first sealing component is movable between a first position and a second position. At the first position, the sleeve filling port coincides with the central tube filling port. At the second position, the sleeve filling port is offset from the central tube filling port. A second sealing component is connected to the outside of the central tube wall. In the non-pressurized state, the second sealing component seals the central tube filling port. In the pressurized state, the second sealing component opens the central tube filling port.

[0008] The internal filling server includes an internal filling cylinder and an elastic positioning cylinder arranged and connected in sequence along the axial direction. The internal filling cylinder has an internal filling port, and the surface of the elastic positioning cylinder has multiple elastic positioning keys. When the internal filling server fills into the external filling server, the multiple elastic positioning keys engage with the multiple positioning slots one by one, and the internal filling port coincides with the filling port of the central tube and the filling port of the sliding sleeve.

[0009] In some embodiments, the inner filling server also includes a limiting component fixed to the radial inner side of the elastic positioning cylinder. When the inner filling server fills into the outer filling server, under pressurized conditions, the limiting component presses against the elastic positioning key and multiple positioning slots to restrict the movement of the elastic positioning cylinder.

[0010] In some embodiments, the limiting component includes a limiting piston, a stop, and a piston return spring. One end of the stop is rotatably fixed to the radially inner side of the elastic positioning key. One end of the piston return spring abuts against the limiting piston, and the other end abuts against the inner wall of the inner filling server. In the pressurized state, the limiting piston compresses the piston return spring axially and drives the stop to press against the elastic positioning key. In the non-pressurized state, the piston return spring pushes the limiting piston to reset and drives the stop to reset.

[0011] In some embodiments, the second sealing assembly includes a switch sleeve and a sleeve return spring that are axially connected and axially movable. The end of the switch sleeve is provided with a switch sleeve shear pin. In the non-pressurized state, the switch sleeve shear pin is aligned with the central tube filling port and blocks the central tube filling port. In the pressurized state, the switch sleeve shear pin is disengaged and the switch sleeve moves downward to compress the sleeve return spring to expose the central tube filling port.

[0012] In some embodiments, the outer layer of the second sealing assembly is provided with an outer protective cover, which is threadedly connected to the central pipe.

[0013] In some embodiments, the external filling server further includes an upper connector, a lifting sub, and a lower connector, which are sequentially fixedly connected axially, and the axially movable range of the first sealing assembly is limited between the upper connector and the lower connector.

[0014] In some embodiments, a guide key is provided on the lifting section, the radially inner side of which is connected to a positioning sleeve to restrict the circumferential rotation of the first sealing assembly.

[0015] In some embodiments, the surface of the elastic split claw has a protrusion, and the upper end of the lifting section is further provided with a limiting groove, wherein when the first sealing assembly is in the second position, the protrusion is embedded in the limiting groove.

[0016] In some implementations, the upper connector, lifting sub, center tube, and lower connector are fixedly connected by threaded engagement.

[0017] In some implementations, there are two positioning slots and two elastic positioning keys. The two positioning slots are axially spaced on the positioning sleeve, and the two elastic positioning keys are axially spaced on the elastic positioning cylinder. When the inner filling server fills into the outer filling server, the elastic positioning keys engage with the positioning slots.

[0018] The present invention has at least the following beneficial technical effects:

[0019] (1) Set up external filling servers and internal filling servers to cooperate in filling. Multiple external filling servers are deployed in sections in the area to be filled, and one internal filling server completes the filling in sections to improve the gravel filling efficiency of long horizontal well sections in oil and gas wells.

[0020] (2) Multiple sealing components are set up to automatically seal when not filled. When the inner filling server fills into the outer filling server, and when filling gravel, the hole positions are automatically aligned and automatically sealed according to the pressure state and structural cooperation. After the gravel is filled, the filling port is closed in time and fully to effectively prevent the gravel backflow and play a double sealing role for the device.

[0021] (3) Multiple positioning components are set up so that the internal filling server can be quickly positioned during the segmented filling process and prevent it from shifting during the filling process. Attached Figure Description

[0022] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other embodiments can be obtained based on these drawings without creative effort.

[0023] Figure 1A schematic diagram of an embodiment of the external filling server of the segmented filling device provided by the present invention;

[0024] Figure 2 A schematic diagram of an embodiment of the internal filling server of the segmented filling device provided by the present invention;

[0025] Figure 3 This is a schematic diagram of the segmented filling device provided by the present invention in the filling state.

[0026] Explanation of reference numerals in the attached figures:

[0027] 1. Upper connector; 2. Limiting groove; 3. Lifting sub; 4. Elastic split claw; 5. Guide key; 6. Guide groove; 7. Switch sleeve shear pin; 8. Central tube filling port; 9. Positioning sleeve filling port; 10. Switch sleeve; 11. Central tube; 12. Return spring; 13. Outer protective cover; 14. Positioning sleeve; 15. Lower connector; 16. Positioning groove; 17. Oil pipe sub; 18. Inner filling cylinder; 19. Inner filling port; 20. Elastic positioning cylinder; 21. Elastic positioning key; 22. Piston retaining ring; 23. Limiting piston; 24. Stop bolt; 25. Stop; 26. Piston return spring; 27. Stop rod; 28. Stop connector; 29. ​​Guide head; 30. "O" ring. Detailed Implementation

[0028] To make the objectives, technical solutions, and advantages of the present invention clearer, the embodiments of the present invention will be further described in detail below with reference to specific examples and the accompanying drawings.

[0029] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art. The terminology used herein is for the purpose of describing particular embodiments only and is not intended to limit the invention. For example, terms such as “length,” “width,” “upper,” “lower,” “left,” “right,” “front,” “rear,” “vertical,” “horizontal,” “top,” “bottom,” “inner,” and “outer” indicate orientations or positions based on the orientations or positions shown in the accompanying drawings and are for ease of description only, and should not be construed as limiting the technical solution.

[0030] The terms "comprising" and "having," and any variations thereof, used in the specification, claims, and accompanying drawings of this invention are intended to cover non-exclusive inclusion; the terms "first," "second," etc., used in the specification, claims, and accompanying drawings are used to distinguish different objects, not to describe a particular order. "A plurality of" means two or more, unless otherwise explicitly specified.

[0031] In the description and claims of this invention and the foregoing drawings, when an element is referred to as "fixed to," "mounted to," "disposed on," or "connected to" another element, it can be located directly or indirectly on that other element. For example, when an element is referred to as "connected to" another element, it can be directly or indirectly connected to that other element.

[0032] Furthermore, the reference to "embodiment" herein means that a particular feature, structure, or characteristic described in connection with an embodiment may be included in at least one embodiment of the invention. The appearance of this phrase in various places throughout the specification does not necessarily refer to the same embodiment, nor is it a separate or alternative embodiment mutually exclusive with other embodiments. It will be explicitly and implicitly understood by those skilled in the art that the embodiments described herein can be combined with other embodiments.

[0033] This invention provides a segmented filling completion device, comprising an external filling server and an internal filling server that can be nested together, such as... Figure 1 The diagram shown is a schematic representation of an embodiment of the external filling server of the segmented filling device provided by the present invention. Figure 2 The diagram shown is a schematic representation of an embodiment of an infill server. Figure 3 The diagram shown is a schematic of the filled state, specifically including:

[0034] An external filling server is provided with a central tube 11, and a central tube filling port 8 is opened on the central tube 11. A first sealing component is arranged axially inside the central tube 11. The first sealing component is located above the plane where the central tube filling port 8 is located. It includes an elastic split claw 4 and a positioning sleeve 14 connected in sequence. A sleeve filling port 9 is opened on the positioning sleeve 14. A plurality of positioning grooves 16 are provided on the surface of the positioning sleeve 14. The first sealing component 4 and 14 are movable between a first position and a second position. At the first position, the sleeve filling port 9 coincides with the central tube filling port 8. At the second position, the sleeve filling port 9 is offset from the central tube filling port 8. A second sealing component is connected to the outside of the central tube 11. In the non-pressurized state, the second sealing component seals the central tube filling port 8. In the pressurized state, the second sealing component opens the central tube filling port 8.

[0035] The internal filling server includes an internal filling cylinder 18 and an elastic positioning cylinder 20 arranged and connected in sequence along the axial direction. The internal filling cylinder 18 has an internal filling port 19. The surface of the elastic positioning cylinder 20 has multiple elastic positioning keys 21. When the internal filling server fills into the external filling server, the multiple elastic positioning keys 21 engage with multiple positioning grooves 16 one by one. The internal filling port 19 coincides with the central tube filling port 8 and the sliding sleeve filling port 9.

[0036] Furthermore, the inner filling server also includes a limiting component, which is fixed to the radially inner side of the elastic positioning cylinder 20. When the inner filling server fills into the outer filling server, under pressurized conditions, the limiting component presses the elastic positioning key 21 and the plurality of positioning grooves 16 to restrict the movement of the elastic positioning cylinder 20. In some embodiments, the limiting component includes a limiting piston 23, a stop block 25, and a piston return spring 26. One end of the stop block 25 is rotatably fixed to the radially inner side of the elastic positioning key 21. One end of the piston return spring 26 abuts against the limiting piston 23, and the other end abuts against the inner wall of the inner filling server. Under pressurized conditions, the limiting piston 23 compresses the piston return spring 26 axially and drives the stop block 25 to press against the elastic positioning key 21. Under non-pressurized conditions, the piston return spring 26 pushes the limiting piston 23 to reset and drives the stop block 25 to reset. Further, the second sealing assembly 10, 12 includes a switch sleeve 10 and a sleeve return spring 12 that are axially connected and axially movable. A switch sleeve shear pin 7 is provided at the end of the switch sleeve 10. In the non-pressurized state, the switch sleeve shear pin 7 aligns with and blocks the central tube filling port 8. In the pressurized state, the switch sleeve shear pin 7 disengages, causing the switch sleeve 10 to compress the sleeve return spring 12 to expose the central tube filling port 8. In some embodiments, an outer protective cover 13 is provided on the outer layer of the second sealing assembly, and the outer protective cover 13 is threadedly connected to the central tube 11.

[0037] Furthermore, there are two positioning slots 16 and two elastic positioning keys 21. The two positioning slots 16 are axially spaced apart in the positioning sleeve 14, and the two elastic positioning keys 21 are axially spaced apart in the elastic positioning cylinder 20. When the inner filling server fills into the outer filling server, the elastic positioning key 21 engages with the positioning slot 16.

[0038] Furthermore, the external filling server also includes an upper connector 1, a lifting section 3, and a lower connector 15. The upper connector 1, the lifting section 3, the central tube 11, and the lower connector 15 are sequentially fixedly connected axially, and the axial movement range of the first sealing assembly is limited between the upper connector 1 and the lower connector 15. In some embodiments, a guide key 5 is provided on the lifting section 3, and the radially inner side of the guide key 5 is connected to the positioning sleeve 14 to limit the circumferential rotation of the first sealing assembly. The surface of the elastic split claw 4 has a protrusion, and the upper end of the lifting section 3 is further provided with a limiting groove 2. When the first sealing assembly is in the second position, the protrusion is embedded in the limiting groove 2.

[0039] The present invention will be further explained below through a specific embodiment, with reference to the accompanying drawings. Figures 1-3 .

[0040] External filling server section: The upper connector 1, lifting section 3, central tube 11, and lower connector 15 are sequentially connected together by threads. The elastic split claw 4 and positioning sleeve 14 are threaded together. The elastic split claw 4 and positioning sleeve 14 are integrally housed within the central tube 11 and can move axially along the inner wall of the central tube 11. As a whole, the upper and lower ends of the elastic split claw 4 and positioning sleeve 14 can respectively move to the roots of the upper connector 1 and lower connector 15. The guide key 5 is threaded onto the lower end of the lifting section 3. Figure 1 The lower end of the middle section is the right end of the lifting section 3. The upper end of the guide key 5 is fixed in the guide groove 6 of the positioning sleeve 14 and has a gap with the guide groove 6, ensuring that the elastic split claw 4 and the positioning sleeve 14 only move axially and do not rotate radially, thereby ensuring that the filling port 8 of the central tube and the filling port 9 of the positioning sleeve are highly aligned after the positioning sleeve 14 is lowered into place.

[0041] The upper end of the elastic split claw 4 has an outward protrusion, which is not shown in the figure. When the inner filling server moves upward, it drives the elastic split claw 4 and the positioning sleeve 14 to move upward together. Due to the limiting effect of the guide key 5 and the guide groove 6 below, the elastic split claw 4 and the positioning sleeve 14 will not continue to move upward during the process, but will move axially. At this time, the filling port 8 of the central tube and the filling port 9 of the positioning sleeve are misaligned. After moving upward to the limiting position, the outward protrusion of the elastic split claw 4 opens and is embedded in the limiting groove 2 at the upper end of the lifting section 3, ensuring that the elastic split claw 4 and the positioning sleeve 14 are fixed in this position after filling is completed, thereby achieving the sealing of the filling port 8 of the central tube by the positioning sleeve 14.

[0042] The switch sleeve 10, the sleeve return spring 12, and the outer protective cover 13 are installed on the outer wall of the central tube 11. The outer protective cover 13 is threadedly connected to the central tube 11. The outer protective cover 13 protects the switch sleeve 10 and the sleeve return spring 12. The switch sleeve 10 can slide axially between the outer protective cover 13 and the central tube 11. After the gravel filling begins, the liquid pressure can shear the switch sleeve shear pin 7 on the switch sleeve 10, causing the switch sleeve 10 to descend and compress the sleeve return spring 12. After the gravel filling is completed, the elastic force of the sleeve return spring 12 causes the switch sleeve 10 to rise, thereby sealing the central tube filling port 8 of the central tube 11 and realizing the double sealing function of the central tube filling port 8 on the central tube 11 of the filling device.

[0043] The internal filling server section comprises a tubing subsection 17, an internal filling cylinder 18, an elastic positioning cylinder 20, a stop connector 28, and a guide head 29, all connected by threads. The internal filling cylinder 18 has an internal filling port 19. After the elastic positioning cylinder 20 is successfully positioned, the three holes—the internal filling port 19, the central tube filling port 8, and the positioning sleeve filling port 9—align, allowing for gravel filling. The elastic positioning cylinder 20 has two raised elastic positioning keys 21, which, in the filling state, engage precisely with the two positioning grooves 16 on the positioning sleeve 14, ensuring accurate tool positioning and preventing axial displacement of the internal filling server. Furthermore, the present invention further provides a piston limiting structure, wherein the piston retaining ring 22 is threadedly connected inside the inner filling cylinder 18, and below it is a limiting piston 23 that can move freely along the axial direction of the inner filling cylinder 18. The piston return spring 26 is sleeved outside the stop rod 27 and has a gap between it and the stop rod 27. The piston return spring 26 is in a slightly compressed state, with its upper end abutting against the limiting piston 23 and its lower end abutting against the guide head 29. The stop bolt 24 connects one end of the stop block 25 to the opening on the side wall of the inner filling cylinder 18. The stop block 25 can rotate around the stop bolt 24. The function of the piston limiting structure is that when filling, the pressure inside the tube increases, and the pressure impacts the limiting piston 23 to move downward, further squeezing the inner side of the stop block 25 to make the stop block 25 rotate outward, pressing the elastic positioning key 21 and the positioning groove 16 to prevent the elastic positioning key 21 from shrinking inward, and further positioning the inner filling server to prevent it from moving axially. When filling stops and pressure is released, the elastic force of the piston return spring 26 causes the limiting piston 23 to reset, and the stop block 25 automatically returns to its original position.

[0044] The operation process of the segmented well filling and completion device of the present invention is as follows:

[0045] During the gravel filling operation, the inner filling server is inserted into the outer filling server. When the two protruding elastic positioning keys 21 on the elastic positioning cylinder 20 reach the positions of the two positioning grooves 16 on the positioning sleeve 14, the elastic positioning keys 21 open and embed into the positioning grooves 16. The inner filling server pushes the elastic split claw 4 and the positioning sleeve 14, which are connected by threads, to move downwards. They are blocked by the lower connector 15. At this time, the central tube filling port 8 and the positioning sleeve filling port 9 coincide. The wellhead pump pressurizes the fluid. After reaching a certain pressure, the switch sleeve shear pin 7 is cut off. The switch sleeve 10 moves down to compress the reset spring 12, exposing the central tube filling port 8, so that the tool is connected inside and out, and the gravel filling operation is carried out. After gravel packing is completed, the wellhead is no longer pumped with fluid for pressurization. The switch sleeve 10 moves upward under the force of the return spring 12, closing the central tube packing port 8 from the outside. Simultaneously, the internal packing server is lifted, causing the elastic split claw 4 and the positioning sleeve 14, which are connected by threads, to move upward. When the elastic split claw 4 reaches the limit groove 2, it opens and embeds itself into the groove, thus misaligning the central tube packing port 8 and the positioning sleeve packing port 9, ensuring the central tube packing port 8 remains sealed, achieving a double seal. The internal packing server is then lifted to remove the external packing server, completing this section of gravel packing. The process is repeated at another location to complete the gravel packing operation for the next section.

[0046] This invention provides a segmented gravel filling completion device. During the filling process, multiple external filling servers can be set up underground to connect multiple segments, while the internal filling server fills each segment one by one. This improves the gravel filling efficiency of long horizontal well sections, enables refined filling and mining, and meets the needs of segmented gravel filling construction. It effectively prevents gravel backflow after gravel filling, and the internal diameter does not shrink during segmented gravel filling, which is beneficial for subsequent in-pipe construction.

[0047] The above are exemplary embodiments disclosed in this invention. However, it should be noted that various changes and modifications can be made without departing from the scope of the embodiments of this invention as defined by the claims. The functions, steps, and / or actions of the methods according to the disclosed embodiments described herein do not need to be performed in any particular order. Furthermore, although the elements disclosed in the embodiments of this invention may be described or claimed individually, they may be understood as multiple unless explicitly limited to a singular number.

[0048] It should be understood that, as used herein, the singular form “a” is intended to include the plural form as well, unless the context clearly supports an exception. It should also be understood that, as used herein, “and / or” refers to any and all possible combinations of one or more of the associated listed items.

[0049] The embodiment numbers disclosed in the above embodiments of the present invention are for descriptive purposes only and do not represent the superiority or inferiority of the embodiments.

[0050] Those skilled in the art should understand that the discussion of any of the above embodiments is merely exemplary and is not intended to imply that the scope of the invention is limited to these examples. Within the framework of the invention, technical features of the above embodiments or different embodiments can be combined, and many other variations of different aspects of the invention exist, which are not provided in the details for the sake of brevity. Therefore, any omissions, modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the invention should be included within the protection scope of the invention.

Claims

1. A segmented filling completion device, characterized in that, This includes interlocking external filling servers and internal filling servers, among which, The external filling server is provided with a central tube (11), and a central tube filling port (8) is opened on the central tube (11). A first sealing component is arranged axially inside the central tube (11). The first sealing component is located above the plane where the central tube filling port (8) is located. The first sealing component includes an elastic split claw (4) and a positioning sleeve (14) connected in sequence. A sleeve filling port (9) is opened on the positioning sleeve (14). A plurality of positioning grooves (16) are provided on the surface of the positioning sleeve (14). The first sealing component is movable between a first position and a second position. At the first position, the sleeve filling port (9) coincides with the central tube filling port (8). At the second position, the sleeve filling port (9) is offset from the central tube filling port (8). A second sealing component is connected to the outside of the central tube (11). In the non-pressurized state, the second sealing component blocks the central tube filling port (8). In the pressurized state, the second sealing component opens the central tube filling port (8). The internal filling server includes an internal filling cylinder (18) and an elastic positioning cylinder (20) arranged and connected in sequence along the axial direction. The internal filling cylinder (18) has an internal filling port (19). The surface of the elastic positioning cylinder (20) has multiple elastic positioning keys (21). When the internal filling server fills into the external filling server, the multiple elastic positioning keys (21) engage with the multiple positioning grooves (16) one by one. The internal filling port (19) coincides with the central tube filling port (8) and the sliding sleeve filling port (9).

2. The segmented filling completion device according to claim 1, characterized in that, The inner filling server also includes a limiting component, which is fixed to the radial inner side of the elastic positioning cylinder (20). When the inner filling server fills into the outer filling server, under pressurized conditions, the limiting component presses the elastic positioning key (21) and the plurality of positioning grooves (16) to restrict the movement of the elastic positioning cylinder (20).

3. The segmented filling completion device according to claim 2, characterized in that, The limiting component includes a limiting piston (23), a stop (25), and a piston return spring (26). One end of the stop (25) is rotatably fixed to the radial inner side of the elastic positioning key (21). One end of the piston return spring (26) abuts against the limiting piston (23), and the other end abuts against the inner wall of the inner filling server. In the pressurized state, the limiting piston (23) compresses the piston return spring (26) axially and drives the stop (25) to press against the elastic positioning key (21). In the non-pressurized state, the piston return spring (26) pushes the limiting piston (23) to reset and drives the stop (25) to reset.

4. The segmented filling completion device according to claim 1, characterized in that, The second sealing assembly includes a switch sleeve (10) connected axially and movable axially and a sleeve return spring (12). The end of the switch sleeve (10) is provided with a switch sleeve shear pin (7). In the non-pressurized state, the switch sleeve shear pin (7) is aligned with the central tube filling port (8) and blocks the central tube filling port (8). In the pressurized state, the switch sleeve shear pin (7) is disconnected and the switch sleeve (10) compresses the sleeve return spring (12) to expose the central tube filling port (8).

5. The segmented filling completion device according to claim 4, characterized in that, The second sealing assembly is provided with an outer protective cover (13), which is threadedly connected to the central tube (11).

6. The segmented filling completion device according to claim 1, characterized in that, The external filling server also includes an upper connector (1), a lifting section (3), and a lower connector (15). The upper connector (1), the lifting section (3), the central tube (11), and the lower connector (15) are sequentially fixedly connected along the axial direction. The axial movable range of the first sealing assembly is limited between the upper connector (1) and the lower connector (15).

7. The segmented filling completion device according to claim 6, characterized in that, The lifting section (3) is provided with a guide key (5), the radial inner side of which is connected to the positioning sleeve (14) to restrict the circumferential rotation of the first sealing assembly.

8. The segmented filling completion device according to claim 6, characterized in that, The elastic split claw (4) has a protrusion on its surface, and the upper end of the lifting section (3) is further provided with a limiting groove (2). When the first sealing component is in the second position, the protrusion is embedded in the limiting groove (2).

9. The segmented filling completion device according to claim 6, characterized in that, The upper connector (1), lifting section (3), central tube (11) and lower connector (15) are fixedly connected by threaded engagement.

10. The segmented filling completion device according to claim 1, characterized in that, There are two positioning slots (16) and two elastic positioning keys (21). The two positioning slots (16) are axially spaced on the positioning sleeve (14), and the two elastic positioning keys (21) are axially spaced on the elastic positioning cylinder (20). When the inner filling server fills into the outer filling server, the elastic positioning key (21) engages with the positioning slot (16).

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