Underground linear motor structure capable of preventing mud, sand, scale and iron powder from adsorbing, blocking and blocking

Abstract

The utility model discloses an underground linear motor structure capable of preventing mud, sand, scale and iron powder from adsorbing, blocking and blocking, which comprises an outer cylinder, an inner wall of which is wound with an armature coil to serve as a stator; the rotor is sleeved in the outer cylinder, a cavity is formed between the rotor and the stator, and the cavity is filled with insulating lubricating liquid; the screen pipe is arranged at the lower end of the outer cylinder, the rotor can penetrate through the outer cylinder to be inserted into the screen pipe and is in sliding sealing fit with the inner wall of the screen pipe, screen holes are formed in the lower end, away from the outer cylinder, of the screen pipe, and a screen mesh is arranged at the position, corresponding to the screen holes, of the inner wall of the screen pipe; and the piston is arranged in the screen pipe and is in sliding sealing fit with the inner wall of the screen pipe. The underground linear motor structure capable of preventing mud, sand, scale and iron powder from adsorbing, blocking and blocking can effectively prevent impurities such as iron chips and mud at the bottom of a well from entering the linear motor to cause damage to the linear motor.

Description

Technical Field

[0001] This utility model relates to the field of downhole operation technology in oil and gas engineering, and more specifically, to a downhole linear motor structure for preventing the adsorption and clogging of mud, sand, scale, and iron powder. Background Technology

[0002] A linear motor is a transmission device that directly converts electrical energy into linear motion mechanical energy without any intermediate conversion mechanism, and is commonly used in downhole operations in oil and gas engineering. However, in complex well conditions, impurities such as iron filings and silt can enter the motor, causing problems such as short circuits and bearing damage, preventing the motor from functioning properly. Furthermore, equipment failures caused by iron filings require time and cost for repairs, indirectly reducing the effective production time and output of oil and gas wells.

[0003] In summary, developing a downhole linear motor structure that prevents the adsorption and clogging of mud, sand, scale, and iron powder, and effectively prevents impurities such as iron filings and mud from entering the linear motor and causing damage, is a problem that urgently needs to be solved by those skilled in the art. Utility Model Content

[0004] In view of this, the purpose of this utility model is to provide a downhole linear motor structure that prevents the adsorption and clogging of mud, sand, scale, iron powder, etc. at the bottom of the well from entering the interior of the linear motor and causing damage to the linear motor.

[0005] To achieve the above objectives, this utility model provides the following technical solution:

[0006] A downhole linear motor structure for preventing clogging by adsorption of mud, sand, scale, and iron powder includes:

[0007] The outer cylinder has an armature coil wound around its inner wall to serve as the stator;

[0008] The moving element is fitted inside the outer cylinder and forms a cavity with the stator, the cavity being filled with an insulating lubricating liquid;

[0009] A sieve tube is located at the lower end of the outer cylinder. The moving part can pass through the outer cylinder and be inserted into the sieve tube and slide and seal with the inner wall of the sieve tube. The lower end of the sieve tube away from the outer cylinder is provided with sieve holes, and the inner wall of the sieve tube is provided with a sieve screen corresponding to the position of the sieve holes.

[0010] A piston is disposed in the screen tube and slides and seals with the inner wall of the screen tube.

[0011] Preferably, the outer wall of the piston is provided with a plurality of annular grooves in the axial direction, and a sealing ring is provided in the annular grooves to contact the inner wall of the screen tube.

[0012] Preferably, the sidewall of the annular groove is an annular step, and the outer periphery of the annular step is chamfered.

[0013] Preferably, a piston cylinder is sleeved inside the screen tube between its upper end and the screen mesh, and the inner wall of the piston cylinder is provided with a polished coating and slides and seals with the piston.

[0014] Preferably, it further includes a connector connecting cylinder, which is located at the upper end of the outer cylinder. The upper end of the connector connecting cylinder away from the outer cylinder is inserted into the mover and is movably sealed to it. The connector connecting cylinder is provided with a through hole, and the armature coil connecting cable passes through the through hole.

[0015] Preferably, the inner wall of the connector connecting cylinder is provided with a groove, and a mud scraper ring that contacts the moving element is provided in the groove.

[0016] Preferably, the connector connecting cylinder has a combined sealing structure on the inner wall below the scraper ring, and the combined sealing structure is in sliding seal cooperation with the moving part.

[0017] Preferably, a wire hole connector is provided between the inner side of the lower end of the connector connecting cylinder and the inner side of the upper end of the outer cylinder. The wire hole connector has a wire hole, through which the cable passes to connect to the armature coil and then passes out through the through hole.

[0018] Preferably, both the connector connecting cylinder and the outer cylinder are non-magnetic metal cylinders.

[0019] Preferably, the mover includes a central shaft and magnetic rings, with a plurality of magnetic rings stacked at the center of the central shaft and all located outside the sieve tube.

[0020] The downhole linear motor structure provided by this utility model, which prevents the adsorption and clogging of mud, sand, scale, and iron powder, generates an electromagnetic field during downhole operations, driving the mover to move up and down. Specifically, when the mover moves upward, the cavity pressure gradually decreases, causing the piston to move upward; conversely, when the mover moves downward, the cavity pressure gradually increases, causing the piston to move downward. This achieves the piston's reciprocating movement within the screen tube, lifting the downhole fluid to the surface. During this process, because a screen mesh is installed on the inner wall of the screen tube corresponding to the screen holes, the screen mesh can initially prevent impurities such as iron filings and mud from the bottom of the well. Furthermore, because the piston is sealed to the inner wall of the screen tube, the piston can further prevent impurities such as iron filings and mud from the bottom of the well. Therefore, the combined action of the piston and the screen mesh effectively prevents impurities such as iron filings and mud from entering the linear motor, thereby avoiding linear motor malfunctions, saving maintenance costs, and increasing production time and output. Attached Figure Description

[0021] To more clearly illustrate the technical solutions in the embodiments of this utility model 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 embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on the provided drawings without creative effort.

[0022] Figure 1 A schematic diagram of a downhole linear motor structure for preventing the adsorption and clogging of mud, sand, scale, and iron powder provided by this utility model;

[0023] Figure 2 for Figure 1 A schematic diagram of a half-section structure;

[0024] Figure 3 for Figure 2 Sectional view at point AA.

[0025] Figure label:

[0026] 1-Connector connecting cylinder; 2-Scraper ring; 3-Combined sealing structure; 4-Wire hole; 5-Motor; 6-Wire hole connector; 7-Outer cylinder; 8-Lower connector; 9-Piston; 10-Screen tube; 11-Screen mesh; 12-Cable; 13-Perforation; 14-Screen hole; 15-Annular toothed groove; 16-Armature coil; 17-Piston cylinder. Detailed Implementation

[0027] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0028] The core of this utility model is to provide a downhole linear motor structure that prevents the adsorption and clogging of mud, sand, scale, iron powder, etc. This downhole linear motor structure effectively prevents impurities such as iron filings and mud from entering the linear motor and causing damage to the linear motor.

[0029] It should be noted that in this embodiment, the orientation or positional relationship indicated by terms such as "upper" and "lower" is based on the orientation or positional relationship shown in the accompanying drawings. It is only for the convenience of describing this application and simplifying the description, and does not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, it should not be construed as a limitation on this application. In addition, "first," "second," "third," and "fourth" are only used to describe effects and should not be construed as indicating or implying relative importance.

[0030] Please refer to Figures 1 to 3 This application provides a downhole linear motor structure for preventing the adsorption and clogging of mud, sand, scale, and iron powder, including an outer cylinder 7, a mover 5, a screen tube 10, and a piston 9.

[0031] An armature coil 16 is wound around the inner wall of the outer cylinder 7 to serve as a stator.

[0032] The mover 5 is fitted into the outer cylinder 7 and forms a cavity between it and the stator, which is filled with insulating lubricating liquid.

[0033] The screen tube 10 is located at the lower end of the outer cylinder 7. The moving part 5 can pass through the outer cylinder 7 and be inserted into the screen tube 10 and slide and seal with the inner wall of the screen tube 10. The lower end of the screen tube 10 away from the outer cylinder 7 is provided with a screen hole 14, and the inner wall of the screen tube 10 is provided with a screen mesh 11 corresponding to the position of the screen hole 14.

[0034] The piston 9 is located in the screen tube 10 and slides and seals with the inner wall of the screen tube 10.

[0035] It should be noted that the downhole linear motor structure for preventing clogging by adsorption of mud, sand, scale, and iron powder in this application adopts an internal magnetic structure, mainly consisting of a stator and a mover 5. The stator is formed by an armature coil 16 wound on the inner wall of the outer cylinder 7. The armature coil 16 is used to connect to an external power source to generate an electromagnetic field, thereby driving the mover 5 to move.

[0036] Specifically, the inner wall of the outer cylinder 7 is provided with annular toothed grooves 15, and an armature coil 16 is wound on the annular toothed grooves 15 to mount the armature coil 16 on the inner wall of the outer cylinder 7. The armature coil 16 and the outer cylinder 7 constitute the stator. The rotor 5 is movably inserted into the outer cylinder 7, leaving a gap between it and the stator to form a cavity. This cavity is a sealed structure and filled with insulating lubricating fluid, which lubricates the internal components such as the stator and rotor, reducing wear. The annular toothed grooves 15 and the armature coils 16 are one-to-one, and their number is not unique; they can be selected adaptively according to actual needs.

[0037] The lower end of the outer cylinder 7 is connected to the screen tube 10 via threads. The screen tube 10 is a tubular structure with a through-hole in the middle. Screen holes 14 are provided at the lower end of the screen tube 10 away from the outer cylinder 7. Preferably, there are multiple screen holes 14, which are evenly spaced around the outer cylinder 7. Each screen hole 14 is elongated along the axial direction of the screen tube 10. Without affecting the liquid inlet of the screen tube 10, it can block large particles of impurities from entering the screen tube 10. In addition, a screen mesh 11 is arranged around the inner wall of the screen tube 10 at the position of the plug hole. The screen mesh 11 can effectively block impurities such as iron filings and mud from entering the screen tube 10. This not only prevents impurities from entering the motor through the piston 9, but also greatly avoids the clogging of the screen tube 10.

[0038] The lower end of the mover 5 can pass through the lower end of the outer cylinder 7 and be inserted into the screen tube 10. The lower end of the mover 5 is in sliding sealing fit with the inner wall of the screen tube 10 so as to adjust the pressure difference between the cavity and the screen tube 10 by moving the mover 5 up and down.

[0039] Piston 9 is installed inside screen tube 10, and the outer wall of piston 9 is slidably sealed to the inner wall of screen tube 10, so that piston 9 can prevent impurities such as iron filings and mud from entering the motor. Piston 9 is slidably located between the upper end of screen tube 10 near outer cylinder 7 and screen 11, so that screen 11 is located below piston 9, to prevent piston 9 from failing to block impurities.

[0040] In the above embodiment, the downhole linear motor structure for preventing the adsorption and blockage of mud, sand, scale, and iron powder occurs during downhole operation. The stator generates an electromagnetic field, driving the mover 5 to move up and down. Specifically, as the mover 5 moves upward, the cavity pressure gradually decreases, causing the piston 9 to move upward; conversely, as the mover 5 moves downward, the cavity pressure gradually increases, causing the piston 9 to move downward. This allows the piston 9 to reciprocate up and down within the screen tube 10, lifting the downhole fluid to the surface. During this process, because the inner wall of the screen tube 10 is equipped with a screen mesh 11 corresponding to the screen holes 14, the screen mesh 11 can initially prevent impurities such as iron filings and mud from the bottom of the well. Furthermore, because the piston 9 is sealed to the inner wall of the screen tube 10, the piston 9 can further prevent impurities such as iron filings and mud from the bottom of the well. Therefore, the combined action of the piston 9 and the screen mesh 11 effectively prevents impurities such as iron filings and mud from entering the linear motor, thereby avoiding motor malfunctions, saving maintenance costs, and increasing production time and output.

[0041] For details regarding the specific design of the sliding seal between piston 9 and screen tube 10, please refer to [reference needed]. Figure 2 Based on the above embodiments, the outer wall of the piston 9 is provided with a plurality of annular grooves in the axial direction, and a sealing ring that contacts the inner wall of the screen tube 10 is provided in the annular groove.

[0042] Understandably, the piston 9 moves up and down along the screen tube 10. A sealing ring is installed between the outer wall of the piston 9 and the inner wall of the screen tube 10. The sealing ring seals the gap between the piston 9 and the screen tube 10, dividing the screen tube 10 into two unconnected spaces with the piston 9 as the boundary. In this way, even if some impurities such as iron filings and mud from the bottom of the well pass through the screen 11 and enter the screen tube 10, the piston 9 can prevent the impurities from entering the motor and damaging components such as the stator and mover 5. In addition, multiple sealing rings are provided and arranged along the axial direction of the piston 9, which can enhance the sealing between the piston 9 and the screen tube 10, effectively preventing impurities from entering the motor.

[0043] Based on the above embodiment, the piston 9 structure is further optimized. The sidewall of the annular groove is an annular step, and the outer periphery of the annular step is chamfered. That is, the outer edge of the piston 9 is chamfered. This setting can prevent impurities from accumulating on the piston 9 and ensure that the piston 9 moves smoothly.

[0044] The structure of the screen tube 10 has been further optimized based on the above embodiments. Please refer to [reference needed]. Figure 2 The screen tube 10 is fitted with a piston cylinder 17 located between its upper end and the screen 11. The inner wall of the piston cylinder 17 is provided with a polished coating and is in sliding sealing cooperation with the piston 9.

[0045] Specifically, a piston cylinder 17 is installed inside the screen tube 10. The piston cylinder 17 is located between the upper end of the screen tube 10 and the screen 11. The piston cylinder 17 serves as the sliding place for the piston 9. The inner wall of the piston cylinder 17 is made of chrome-plated hardened polishing process, so that the inner wall of the piston cylinder 17 is processed into a polished coating. This coating can greatly reduce friction, ensure smooth and stable sliding of the piston 9, and the coating has high wear resistance and corrosion resistance, which can greatly reduce the wear of the screen tube 10 and improve the service life of the screen tube 10.

[0046] Considering the specific stator power connection settings, please refer to the above embodiment for further details. Figure 1 The connector connecting cylinder 1 is located at the upper end of the outer cylinder 7. The upper end of the connector connecting cylinder 1 away from the outer cylinder 7 is inserted into the moving part 5 and is movably sealed with it. The connector connecting cylinder 1 is provided with a through hole 13. The armature coil 16 is connected to the cable 12, and the cable 12 passes through the through hole 13.

[0047] Specifically, the connector connecting cylinder 1 and the outer cylinder 7 are coaxially connected as one unit. The mover 5 is inserted into the connector connecting cylinder 1 and sealed to the inner wall of the connector connecting cylinder 1 to seal the inside of the motor. A through hole 13 is provided on the cylinder wall of the connector connecting cylinder 1. After the cable 12 is connected to the armature coil 16, it can pass through the through hole 13 to connect to an external power source, thereby energizing the armature coil 16 and generating an electromagnetic field.

[0048] It should be noted that during the up-and-down movement of the mover 5, the upper end of the mover 5 will protrude through the connector connecting cylinder 1, which may cause impurities such as iron filings and mud from the bottom of the well to stick to the mover 5.

[0049] To prevent impurities from being carried into the motor by the moving part 5, please refer to the following based on the above embodiment: Figure 2 The inner wall of the connector cylinder 1 is provided with a groove, and a scraper ring 2 that contacts the mover 5 is provided in the groove. Thus, during the up and down movement of the mover 5, the scraper ring 2 can scrape off impurities on the mover 5 to prevent impurities from entering the motor with the mover 5.

[0050] Further, please refer to Figure 2The connector connecting cylinder 1 is provided with a combined sealing structure 3 on the inner wall below the mud scraper ring 2. The combined sealing structure 3 is in sliding sealing cooperation with the moving part 5.

[0051] It is understandable that the combined sealing structure 3 is set between the inner wall of the connector connecting cylinder 1 and the mover 5. The combined sealing structure 3 can seal the gap between the mover 5 and the inner wall of the connector connecting cylinder 1. In other words, the interior of the connector connecting cylinder 1 is divided into two non-communicating spaces by the combined sealing structure 3. Thus, the combined sealing structure 3 is located on the lower side of the mud scraper ring 2, which can prevent the impurities scraped by the mud scraper ring 2 from falling into the motor.

[0052] Optionally, the combined sealing structure 3 can adopt an annular protrusion and a sealing ring disposed on its inner wall. The annular protrusion is integrally disposed with the inner wall of the connector connecting cylinder 1, and the sealing ring contacts the moving part 5 to achieve a sealing effect.

[0053] Considering the specific installation of cable 12, please refer to the above embodiment for further details. Figure 2 and Figure 3 A wire hole connector 6 is provided between the inner side of the lower end of the connector connecting cylinder 1 and the inner side of the upper end of the outer cylinder 7. The wire hole connector 6 is provided with a wire hole 4. The cable 12 passes through the wire hole 4 to connect the armature coil 16, and then passes out through the through hole 13.

[0054] Specifically, the lower end of the connector cylinder 1 is connected to the upper end of the wire hole connector 6 via a threaded connection. The lower end of the wire hole connector 6 can also be connected to the upper end of the outer cylinder 7 via a threaded connection, thus the wire hole connector 6 is fitted into the lower end of the connector cylinder 1 and the upper end of the outer cylinder 7. The inner wall of the wire hole connector 6 slides in contact with the moving part 5, allowing the moving part 5 to move up and down through the wire hole connector 6. The wire hole connector 6 is provided with wire holes 4. Preferably, multiple wire holes 4 are arranged circumferentially around the wire hole connector 6. During assembly, the cable 12 can be inserted into the wire holes 4 of the wire hole connector 6, facilitating a secure connection between the cable 12 and the armature coil 16. After connection, the cable 12 can then pass through the through hole 13 of the connector cylinder 1 to connect to an external power source. Therefore, the wire hole connector 6 with the above structure not only ensures a secure connection between the cable 12 and the armature coil 16 but also facilitates the orderly exit of the cable 12 from the connector cylinder 1.

[0055] Based on the above embodiments, both the connector connecting cylinder 1 and the outer cylinder 7 are non-magnetic metal cylinders. It is understood that the connector connecting cylinder 1 and the outer cylinder 7 together form the outer casing of the motor. The outer casing is made of non-magnetic metal material, which can avoid magnetization and the attraction of iron filings.

[0056] Considering the specific structure of the mover 5, based on any of the above embodiments, the mover 5 includes a central shaft and a magnetic ring, with multiple magnetic rings stacked in the middle of the central shaft and all located outside the screen tube 10.

[0057] The central shaft serves as the support structure for the mover 5. Its upper end protrudes from the upper end of the outer cylinder 7 and is inserted into the connector connecting cylinder 1, while its lower end protrudes from the lower end of the outer cylinder 7 and is inserted into the screen tube 10. A magnetic ring, made of permanent magnet material, is positioned in the middle of the central shaft to generate a magnetic field that interacts with the stator. Furthermore, the magnetic ring does not enter the screen tube 10 with the central shaft to prevent the screen tube 10 from being magnetized and to avoid the screen tube 10 attracting iron filings.

[0058] Based on any of the above embodiments, please refer to Figure 1 The lower end of the screen tube 10, away from the outer cylinder 7, is connected to a lower connector 8 to facilitate the connection of other tools through the lower connector 8.

[0059] In summary, the downhole linear motor structure for preventing the adsorption and clogging of mud, sand, scale, and iron powder provided in this application is applicable to downhole operations as follows:

[0060] The first step is to lower the linear motor, along with the plunger pump or other tools, into the construction well.

[0061] The second step is to supply power to the linear motor through cable 12 when the linear motor reaches the target section of the construction well.

[0062] The third step is to power on the linear motor, and the armature coil 16 generates an electromagnetic field, which drives the mover 5 to move.

[0063] Fourth step: The moving part 5 moves upward. When the magnetic ring reaches the position of the combined sealing structure 3, which is the top dead center, the moving part 5 stops moving. During this process, the cavity pressure gradually decreases, and the piston 9 gradually moves upward.

[0064] Fifth step: When the magnetic ring is at the bottom dead center of the connection between the screen tube 10 and the outer cylinder 7, and the mover 5 moves down to the bottom dead center, the magnetic ring does not enter the screen tube 10. During this process, the cavity pressure gradually increases, and the piston 9 gradually moves down.

[0065] The downhole linear motor structure for preventing blockage caused by the adsorption and clogging of mud, sand, scale, and iron powder provided in this application has the following beneficial effects:

[0066] 1. The piston 9 and the screen 11 work together to effectively prevent impurities such as iron filings and mud from entering the linear motor.

[0067] 2. The mud scraper ring 2 and the combined sealing structure 3 work together to effectively prevent impurities such as iron filings and mud from entering the linear motor.

[0068] 3. The linear motor contains an insulating lubricating fluid to lubricate internal components and reduce wear.

[0069] 4. The linear motor housing is made of non-magnetic metal material, which will not be magnetized and will not attract iron filings.

[0070] The various embodiments in this specification are described in a progressive manner, with each embodiment focusing on the differences from other embodiments. The same or similar parts between the various embodiments can be referred to each other.

[0071] The above provides a detailed description of the downhole linear motor structure for preventing the adsorption and clogging of mud, sand, scale, and iron powder provided by this utility model. Specific examples have been used to illustrate the principle and implementation of this utility model. The descriptions of the embodiments above are only for the purpose of helping to understand the method and core idea of ​​this utility model. It should be noted that for those skilled in the art, several improvements and modifications can be made to this utility model without departing from the principle of this utility model, and these improvements and modifications also fall within the protection scope of the claims of this utility model.

Claims

1. A downhole linear motor structure for preventing the adsorption and clogging of mud, sand, scale, and iron powder, characterized in that, include: The outer cylinder (7) has an armature coil (16) wound around its inner wall to serve as a stator; The moving part (5) is fitted into the outer cylinder (7) and forms a cavity with the stator, the cavity being filled with insulating lubricating liquid; A sieve tube (10) is located at the lower end of the outer cylinder (7). The moving part (5) can pass through the outer cylinder (7) and be inserted into the sieve tube (10) and slide and seal with the inner wall of the sieve tube (10). The lower end of the sieve tube (10) away from the outer cylinder (7) is provided with a sieve hole (14), and the inner wall of the sieve tube (10) is provided with a screen (11) corresponding to the position of the sieve hole (14). The piston (9) is disposed in the screen tube (10) and slides and seals with the inner wall of the screen tube (10).

2. The downhole linear motor structure for preventing the adsorption and clogging of mud, sand, scale, and iron powder according to claim 1, characterized in that, The outer wall of the piston (9) is provided with a plurality of annular grooves in the axial direction, and a sealing ring is provided in the annular grooves to contact the inner wall of the screen tube (10).

3. The downhole linear motor structure for preventing the adsorption and clogging of mud, sand, scale, and iron powder according to claim 2, is characterized in that, The sidewall of the annular groove is an annular step, and the outer periphery of the annular step is chamfered.

4. The downhole linear motor structure for preventing the adsorption and clogging of mud, sand, scale, and iron powder according to claim 1, characterized in that, The screen tube (10) is fitted with a piston cylinder (17) located between its upper end and the screen (11). The inner wall of the piston cylinder (17) is provided with a polished coating and is in sliding and sealing cooperation with the piston (9).

5. The downhole linear motor structure for preventing the adsorption and clogging of mud, sand, scale, and iron powder according to claim 1, characterized in that, It also includes a connector connecting cylinder (1), which is located at the upper end of the outer cylinder (7). The upper end of the connector connecting cylinder (1) away from the outer cylinder (7) is inserted into the mover (5) and is movably sealed to it. The connector connecting cylinder (1) is provided with a through hole (13). The armature coil (16) is connected to a cable (12), and the cable (12) passes through the through hole (13).

6. The downhole linear motor structure for preventing the adsorption and clogging of mud, sand, scale, and iron powder according to claim 5, is characterized in that, The inner wall of the connector connecting cylinder (1) is provided with a groove, and a scraper ring (2) that contacts the moving part (5) is provided in the groove.

7. The downhole linear motor structure for preventing the adsorption and clogging of mud, sand, scale, and iron powder according to claim 6, characterized in that, The connector connecting cylinder (1) is provided with a combined sealing structure (3) on the inner wall below the mud scraper ring (2), and the combined sealing structure (3) is in sliding sealing cooperation with the moving part (5).

8. The downhole linear motor structure for preventing the adsorption and clogging of mud, sand, scale, and iron powder according to claim 5, is characterized in that, A wire hole connector (6) is provided between the inner side of the lower end of the connector connecting cylinder (1) and the inner side of the upper end of the outer cylinder (7). The wire hole connector (6) is provided with a wire hole (4). The cable (12) passes through the wire hole (4) to connect to the armature coil (16) and then passes out through the through hole (13).

9. The downhole linear motor structure for preventing the adsorption and clogging of mud, sand, scale, and iron powder according to claim 8, characterized in that, Both the connector connecting cylinder (1) and the outer cylinder (7) are non-magnetic metal cylinders.

10. The downhole linear motor structure for preventing the adsorption and clogging of mud, sand, scale, and iron powder according to any one of claims 1 to 9, characterized in that, The mover (5) includes a central shaft and a magnetic ring, with multiple magnetic rings stacked in the middle of the central shaft and all located outside the sieve tube (10).

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