Annular flow blocking tool for continuous sand washing
By designing an annular flow blocking tool for continuous sand flushing and utilizing sealing structure and magnetic conduction control, the problems of high cost of continuous tubing sand flushing and discontinuous sand flushing of conventional tubing are solved, the flexibility and stability of the seal are achieved, the difficulty and cost of maintenance are reduced, and the continuity and safety of the sand flushing process are ensured.
Patent Information
- Application Number
- CN202422794565.3
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-11-16
- Publication Date
- 2025-09-09
- Estimated Expiration
- 2034-11-16
AI Technical Summary
The existing coiled tubing sand flushing technology and equipment are expensive, and the conventional tubing sand flushing process is discontinuous, which can easily lead to coal powder falling back and sand sticking, affecting the smooth flow of the wellbore.
An annular flow blocking tool for continuous sand flushing was designed, which includes an upper joint, a center pipe, a lower joint, an isolation pipe string and a sealing structure. Components such as a sealing convex annular rubber ring, a set L-shaped ring, and an expansion electromagnet are used to achieve multiple sealing of the isolation pipe string. The sealing process is controlled by a movable set and magnetic conduction, thereby enhancing sealing reliability and operational convenience.
It improves the flexibility and stability of the seal, reduces the difficulty and cost of maintenance, ensures the continuity of the sand flushing process, reduces the risk of leakage, and enhances the versatility and adaptability of the device.
Smart Images
Figure CN223317834U_ABST
Abstract
Description
Technical Field
[0001] The utility model relates to the technical field of sand flushing annulus, in particular to an annulus flow blocking tool for continuous sand flushing. Background Art
[0002] Currently, most coalbed methane wells in China are constructed using casing or screens. However, during the extraction process, coal ash flows into the wellbore along with the coalbed methane and gradually accumulates, negatively impacting gas production. Therefore, regular sand flushing operations are necessary to maintain smooth wellbore operation. In China, sand flushing technologies are primarily categorized into coiled tubing sand flushing and conventional tubing sand flushing.
[0003] If coiled tubing sand flushing technology is used, the equipment costs are relatively high, making it difficult to achieve ideal economic benefits. In contrast, conventional tubing sand flushing technology injects a sand flushing medium through the wellhead tubing. However, pumping must be suspended between connections, resulting in an intermittent sand flushing process. During this time, coal dust easily falls back, increasing the risk of sand sticking. In light of this, in-depth research into this issue led to the present case. Utility Model Content
[0004] To achieve the above objectives, the present invention is implemented through the following technical solutions: an annulus flow blocking tool for continuous sand flushing, comprising: an upper joint, a center pipe, a lower joint, an isolation pipe string, and a sealing structure, wherein the upper joint and the lower joint are respectively sleeved on the upper and lower ends of the center pipe, and the center pipe is movably placed inside the isolation pipe string through the sealing structure;
[0005] The sealing structure comprises: a plurality of sealing convex annular rubber rings, a plurality of set L-shaped annular rings, a plurality of set lifting and extruding annular rings, a plurality of connecting threaded rods, a plurality of fixing bolts, a plurality of expansion electromagnets, a plurality of expansion metal rods, a plurality of expansion metal strips and a plurality of magnet deformation blocks;
[0006] Several of the set lifting and extrusion rings are movably mounted on several of the center tubes, several of the set L-shaped rings are cross-mounted on several of the set lifting and extrusion rings, several of the sealing convex ring rubber rings are movably inserted between several pairs of the set L-shaped rings, several of the set lifting and extrusion rings are respectively provided with threaded holes, several of the connecting threaded rods are movably inserted into the inner sides of several of the threaded holes, several of the fixing bolts are respectively mounted on several of the connecting threaded rods, several of the expansion metal rods are respectively inserted into several of the center tubes and the sand blasting pipe columns, several of the expansion electromagnets are respectively mounted on several of the expansion metal rods, several of the expansion metal bars are respectively inserted into several of the set lifting and extrusion rings and several of the set L-shaped rings, and several of the magnet deformation blocks are respectively inserted into several of the sealing convex ring rubber rings;
[0007] It should be noted that, in the above, by inserting the center tube into the lower joint, several set lifting and extrusion rings are movably sleeved on the center tube, the upper joint is movably sleeved on the lifting and extrusion ring, and several connecting threaded rods are movably inserted into the upper joint, the several lifting and extrusion rings and the lower joint, and the several connecting threaded rods are fixed to the upper joint by fixing bolts. At the same time, the set L-shaped rings on them are driven respectively by the several set lifting and extrusion rings, and the several sealing convex ring rubber rings are squeezed and fixed by the several relative set L-shaped rings, so that the several sealing The convex circular rubber ring is limited between the central tube and the isolation pipe column. At the same time, a number of expansion metal rods are evenly inserted into the upper joint and a number of set lifting and extrusion rings, and an expansion electromagnet is placed on the number of expansion metal rods. The expansion electromagnet conducts magnetism to the expansion metal rods, and the magnetism is transferred to the number of expansion metal strips through the number of expansion metal rods. The magnet deformation blocks are magnetically repelled by the number of magnetic expansion metal strips, and the sealing convex circular rubber rings on them are driven by the number of magnet deformation blocks to extrude and seal the isolation pipe column, thereby achieving a sealing effect.
[0008] Preferably, the sealing convex annular rubber ring is made of rubber with added graphite component.
[0009] Preferably, the upper joint, the central tube and the lower joint are provided with threads.
[0010] Preferably, a plurality of the set L-shaped rings are respectively provided with a buffer rubber ring.
[0011] Preferably, a plurality of the magnet deformation blocks are arranged in a well shape.
[0012] Preferably, a plurality of the sealing convex circular rubber rings are respectively provided with a buffer arc rubber ring.
[0013] The utility model provides an annular flow blocking tool for continuous sand flushing. The tool has the following beneficial effects: The tool utilizes a movable sleeve design that incorporates a lifting and lowering extrusion ring, enabling the entire sealing system to adjust the sealing force and position according to actual needs, thereby improving installation flexibility and adaptability. The tool utilizes multiple convex sealing rings, which are squeezed and fixed by a sleeved L-shaped ring, and the interaction of an extended metal rod, an extended electromagnet, and a magnet deformation block to achieve multiple seals on the isolation pipe column, effectively preventing leakage and enhancing the reliability and stability of the seal. Because the various components are connected by movable sleeves and threaded rods, worn or damaged components can be easily disassembled and replaced, reducing maintenance difficulty and cost. The extended electromagnet conducts magnetic energy to the extended metal rod, thereby controlling the movement of the magnet deformation block and the convex sealing ring ring, achieving intelligent control of the sealing process and improving operational convenience and precision. The sealing device is designed with extended metal rods and extended metal strips, and the number of these components can be increased or decreased according to actual needs to accommodate isolation pipe columns of different sizes and shapes, thereby enhancing the versatility and expandability of the device. BRIEF DESCRIPTION OF THE DRAWINGS
[0014] Figure 1 This is a schematic front view and cross-sectional view of the annular flow blocking tool for continuous sand flushing according to the present invention.
[0015] Figure 2 It is a side sectional schematic diagram of the annular flow blocking tool for continuous sand flushing described in the present invention.
[0016] Figure 3 for Figure 2 A partial enlarged view of "A".
[0017] In the figure: 1. Upper joint; 2. Center tube; 3. Lower joint; 4. Isolation column; 5. Sealing convex ring rubber ring; 6. Set L-shaped ring; 7. Set lifting and extrusion ring; 8. Connecting threaded rod; 9. Fixing bolt; 10. Extension electromagnet; 11. Extension metal rod; 12. Extension metal strip; 13. Magnet deformation block. DETAILED DESCRIPTION
[0018] Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making any creative work shall fall within the scope of protection of the present invention.
[0019] Through the use of wires by those skilled in the art, all electrical components in this case are connected to their corresponding power supplies, and appropriate controllers and encoders should be selected according to actual conditions to meet control requirements. The specific connection and control sequence should refer to the following working principle, in which the electrical components are electrically connected in sequence. The detailed connection means are well-known technologies in this field. The following mainly introduces the working principle and process, and no longer explains the electrical control. Example
[0020] The present invention will be described in detail below with reference to the accompanying drawings. Figure 1-3 As shown, the upper joint 1 and the lower joint 3 are respectively sleeved on the upper and lower ends of the central tube 2, and the central tube 2 is movably placed on the inner side of the isolation column 4 through a sealing structure; the sealing structure includes: a plurality of sealing convex annular rubber rings 5, a plurality of set L-shaped annular rings 6, a plurality of set lifting and extruding annular rings 7, a plurality of connecting threaded rods 8, a plurality of fixing bolts 9, a plurality of expansion electromagnets 10, a plurality of expansion metal rods 11, a plurality of expansion metal strips 12 and a plurality of magnet deformation blocks 13; a plurality of the set lifting and extruding annular rings 7 are respectively movably sleeved on a plurality of the central tubes 2, a plurality of the set L-shaped annular rings 6 are respectively cross-mounted on a plurality of the set lifting and extruding annular rings 7, a plurality of the sealing convex annular rubber rings 5 are respectively movably inserted between a plurality of pairs of the set L-shaped annular rings 6, a plurality of the set lifting and extruding annular rings 7 are respectively provided with threaded holes, a plurality of the connecting threaded rods 8 are respectively movably inserted into the inner sides of several of the threaded holes, several of the fixing bolts 9 are respectively installed on several of the connecting threaded rods 8, several of the expanded metal rods 11 are respectively inserted into several of the central tubes 2 and the sand blasting pipe columns, several of the expanded electromagnets 10 are respectively installed on several of the expanded metal rods 11, several of the expanded metal strips 12 are respectively inserted into several of the set lifting and extrusion rings 7 and several of the set L-shaped rings 6, and several of the magnet deformation blocks 13 are respectively inserted into several of the sealing convex circular ring rubber rings 5; the sealing convex circular ring rubber ring 5 is made of rubber with added graphite components; the upper joint 1, the central tube 2 and the lower joint 3 are provided with threads; several of the set L-shaped rings 6 are respectively provided with buffer rubber rings; several of the magnet deformation blocks 13 are arranged in a well shape; and several of the sealing convex circular ring rubber rings 5 are respectively provided with buffer arc rubber rings.
[0021] According to the attached Figure 1-3It is concluded that by inserting the center tube 2 on the lower joint 3, several set lifting and extrusion rings 7 are movably sleeved on the center tube 2, the upper joint 1 is movably sleeved on the lifting and extrusion ring, and several connecting threaded rods 8 are movably inserted on the upper joint 1, several lifting and extrusion rings and the lower joint 3. The several connecting threaded rods 8 are fixed to the upper joint 1 by fixing bolts 9. At the same time, the set L-shaped rings 6 on them are respectively driven by the several set lifting and extrusion rings 7. The several sealing convex ring rubber rings 5 are squeezed and fixed by the several relative set L-shaped rings 6, so that the several sealing convex ring rubber rings 5 are limited in position. Between the central pipe 2 and the isolation column 4, a plurality of extended metal rods 11 are evenly inserted into the upper joint 1 and a plurality of set lifting and extrusion rings 7, and an extended electromagnet 10 is placed on the plurality of extended metal rods 11. The extended electromagnet 10 conducts magnetic energy to the extended metal rods 11, and the magnetism is transferred to the plurality of extended metal strips 12 through the plurality of extended metal rods 11. The plurality of magnetic extended metal strips 12 magnetically repel the magnet deformation blocks 13, and the plurality of magnet deformation blocks 13 respectively drive the sealing convex annular rubber rings 5 thereon to extrude and seal the isolation column 4, thereby achieving a sealing effect.
[0022] Although the embodiments of the present invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and variations may be made to these embodiments without departing from the principles and spirit of the present invention, and the scope of the present invention is defined by the appended claims and their equivalents.
Claims
1. Annular flow blocking tool for continuous sand flushing, including: An upper joint, a center pipe, a lower joint, an isolation column, and a sealing structure, wherein the upper joint and the lower joint are respectively sleeved on the upper and lower ends of the center pipe, and the center pipe is movably placed inside the isolation column through the sealing structure; The sealing structure comprises: a plurality of sealing convex annular rubber rings, a plurality of set L-shaped annular rings, a plurality of set lifting and extruding annular rings, a plurality of connecting threaded rods, a plurality of fixing bolts, a plurality of expansion electromagnets, a plurality of expansion metal rods, a plurality of expansion metal strips and a plurality of magnet deformation blocks; Several of the set lifting and extrusion rings are movably mounted on several of the center tubes, several of the set L-shaped rings are cross-mounted on several of the set lifting and extrusion rings, several of the sealing convex ring rubber rings are movably inserted between several pairs of the set L-shaped rings, several of the set lifting and extrusion rings are respectively provided with threaded holes, several of the connecting threaded rods are movably inserted on the inner sides of several of the threaded holes, several of the fixing bolts are respectively installed on several of the connecting threaded rods, several of the extended metal rods are respectively inserted on several of the center tubes and the sand blasting pipe columns, several of the extended electromagnets are respectively installed on several of the extended metal rods, several of the extended metal bars are respectively inserted on several of the set lifting and extrusion rings and several of the set L-shaped rings, and several of the magnet deformation blocks are respectively inserted on several of the sealing convex ring rubber rings.
2. The annular flow blocking tool for continuous sand flushing according to claim 1, characterized in that: The sealing convex annular rubber ring is made of rubber with graphite added.
3. The annular flow blocking tool for continuous sand flushing according to claim 2, characterized in that: The upper joint, the central pipe and the lower joint are provided with threads.
4. The annular flow blocking tool for continuous sand flushing according to claim 3, characterized in that: Buffer rubber rings are respectively provided on the plurality of suited L-shaped rings.
5. The annular flow blocking tool for continuous sand flushing according to claim 4, characterized in that: A plurality of magnet deformation blocks are arranged in a well shape.
6. The annular flow blocking tool for continuous sand flushing according to claim 5, characterized in that: A plurality of the sealing convex annular rubber rings are respectively provided with buffer arc rubber rings.