Multi-gear controller and multi-oil-layer flow control device

Abstract

A multi-gear controller and a multi-oil-layer flow control device; in the controller, an inner sleeve is arranged in the annular space and can move in the axial direction; the inner sleeve is communicated with the upper and lower pressing holes; three seals are arranged on the outer wall of the inner sleeve; the side wall of the upper cylinder is communicated with the upper and lower pressure transmission holes; a track groove is formed in the outer wall of the inner sleeve and is provided with a long groove, a plurality of short grooves, a steering groove and a ring groove; positioning pins are arranged on the inner walls of the positioning cylinders. In the control device, an upper hydraulic control pipeline is communicated with an upper pressing hole of each multi-gear controller, and a lower hydraulic control pipeline is communicated with a lower pressing hole of each multi-gear controller; the flow control pipeline is communicated with the upper pressure transmission hole of each multi-gear controller, and the lower pressure transmission hole of each multi-gear controller is communicated with the corresponding flow control tool. The two ends of the inner sleeve are pressed to drive the middle seal to move up and down, and the upper pressure transmission hole and the lower pressure transmission hole are separated and communicated. The switches of a plurality of flow control tools can be controlled by using three hydraulic control pipelines, a certain oil layer can be opened independently, and the requirement of independent exploitation is met.

Description

Technical Field

[0001] This invention relates to the field of oil and gas field completion tools, specifically a multi-level controller and a multi-layer flow control device. Background Art

[0002] In oil and gas well completion operations, each oil layer has a corresponding flow control device; each flow control tool requires two hydraulic control lines to control its opening and closing by applying hydraulic pressure to its open and closed ends. Currently, flow control tools for multiple oil layers generally share a hydraulic control line, which can only be opened and closed simultaneously during operation, making it inconvenient to use. If the effect of stratified exploitation is required, a separate control line must be set up for each flow control tool. In this case, several (n) flow control tools would require twice the number (2n) of the hydraulic control lines, resulting in an excessive number of hydraulic control lines required, making it difficult to set up downhole in multiple oil layers, and thus failing to meet the individual exploitation needs of multiple producing layers. Summary of the Invention

[0003] To address the existing problems, this invention aims to provide a multi-level controller and a multi-layer flow control device, which enables the opening or closing of a specific oil layer through a small number of hydraulic control pipelines on the ground, thereby achieving independent extraction.

[0004] To achieve the above objectives, the present invention provides a multi-position controller, comprising a spindle, an upper cylinder, and an inner sleeve, wherein the inner sleeve is disposed in an annular space between the outer wall of the spindle and the inner wall of the upper cylinder, and can move axially; the upper end and the lower end of the inner sleeve are respectively connected to an upper pressure hole and a lower pressure hole.

[0005] The inner sleeve has three seals on its outer wall in the middle (upper seal, middle seal, and lower seal), which form sealing surfaces with the inner wall of the upper cylinder, dividing the annular space into four sealing annular spaces; the side wall of the upper cylinder has a boss, and the upper and lower ends of the boss are respectively provided with an upper pressure hole and a lower pressure hole that connect to the annular space.

[0006] The lower outer wall of the inner sleeve is provided with a circumferentially arranged track groove. The upper side of the track groove is provided with a long groove and several short grooves extending upward along the axis (corresponding to different gear positions). The lower side of the track groove is provided with a turning groove. There is also an annular groove for switching between the long groove / short groove and the turning groove. The track groove is fitted with a circumferentially rotatable positioning cylinder. The inner wall of the positioning cylinder is provided with a positioning pin that slides with the track groove.

[0007] Initially, the upper and lower pressure transmission holes are connected to the sealing annulus spaces at the upper and lower ends of the central seal, respectively, but are not interconnected. When switching gears, pressure is applied from the upper pressure hole to push the inner sleeve downwards, and then pressure is applied from the lower pressure hole to push the inner sleeve upwards. The positioning pin slides and switches continuously along the track groove. When the positioning pin enters the upper end of the long groove, the central seal of the inner sleeve moves downwards and passes the lower pressure transmission hole, connecting the upper and lower pressure transmission holes and completing the opening. When the positioning pin enters the short groove, the central seal moves upwards to the top of the lower pressure transmission hole, disconnecting the upper and lower pressure transmission holes and completing the closing. This cycle repeats continuously.

[0008] The lower outer wall of the inner sleeve is connected to a movable sleeve, and the track groove is located on the outer wall of the movable sleeve.

[0009] The lower end of the upper cylinder is connected to the upper end of the lower cylinder, and the positioning cylinder is located inside the lower cylinder.

[0010] The positioning cylinder has bearings at both ends.

[0011] The upper outer wall of the lower connector is connected to the lower inner wall of the lower cylinder, and the upper inner wall of the lower connector is connected to the lower outer wall of the mandrel.

[0012] The lower connector has a retaining ring on its lower outer wall, with the upper end face of the retaining ring abutting against the lower end face of the lower cylinder. The inner sleeve has an open annular groove on its upper outer wall, with an open annular ring in the groove to prevent displacement during insertion. The open annular ring expands radially and is engaged in the annular groove on the inner wall of the upper cylinder. The lower edge of the annular groove on the inner wall has a corresponding bevel angle for the retaining ring.

[0013] Anti-rotation screws are provided between the outer wall of the mandrel and the inner wall of the upper cylinder.

[0014] An anti-rotation screw is provided between the lower outer wall of the mandrel and the upper inner wall of the lower connector.

[0015] Anti-rotation screws are provided between the outer wall of the inner sleeve and the inner wall of the movable sleeve.

[0016] Anti-rotation screws are provided between the upper end of the lower cylinder and the lower end of the upper cylinder.

[0017] Anti-rotation screws are provided between the outer wall of the lower connector and the inner wall of the retaining ring.

[0018] The inner sleeve has three sealing bosses distributed axially along the outer wall of the middle section. Each sealing boss has a sealing groove, and each sealing groove is equipped with a sealing component to form three seals.

[0019] A sealing ring is provided between the upper inner wall of the inner sleeve and the outer wall of the mandrel.

[0020] A sealing assembly is provided between the lower end of the upper cylinder and the upper end of the lower cylinder.

[0021] A sealing assembly is provided between the lower inner wall of the lower cylinder and the upper outer wall of the lower connector.

[0022] A sealing assembly is provided between the upper inner wall of the lower connector and the lower outer wall of the mandrel.

[0023] The present invention also provides a multi-layer flow control device, comprising several sets of any of the aforementioned multi-position controllers and flow control tools, the number of sets corresponding to the number of oil layers; further comprising an upper liquid control line, a lower liquid control line, and a flow control line; wherein, the upper liquid control line is connected to the upper pressure port of each multi-position controller, and the lower liquid control line is connected to the lower pressure port of each multi-position controller; the flow control line is connected to the upper pressure port of each multi-position controller, and the lower pressure port of each multi-position controller is connected to the opening end of the flow control tool corresponding to the oil layer.

[0024] Initially, the positioning pins of each multi-position controller are located in their respective steering grooves, and all multi-position controllers are in the off state. During use, the upper liquid control line pressurizes through each upper pressure hole to move each inner sleeve downward, and then the lower liquid control line pressurizes through each lower pressure hole to move each inner sleeve upward. At the same time, each multi-position controller slides along the track groove and switches positions, so that one flow control tool is always in the on state during the process. After the cycle is completed, it returns to the initial state and is turned off again.

[0025] Compared with existing technologies, the multi-position controller of this invention drives the central seal on the outer wall of the inner sleeve to move up and down synchronously by pressing down on both ends of the inner sleeve, thereby isolating and connecting the upper and lower pressure transmission holes and acting as a switch for the flow control tool. At the same time, the switching between the on / off positions is achieved by sliding between the long and short slots through the cooperation of the track groove and the positioning pin.

[0026] The multi-layer flow control device of this invention, through the series connection of several staggered multi-stage controllers, can control the switching of several flow control tools using only three hydraulic control lines. It can individually open a specific oil layer, meeting the needs of individual extraction. The number of hydraulic control lines is no longer in a two-to-one relationship with the number of flow control tools, and remains consistently three, greatly reducing the number of lines and facilitating downhole layout. Furthermore, the positioning cylinder's position can be adjusted according to the number of tools required for control, precisely controlling the switching of tools at different levels. Attached Figure Description

[0027] Figure 1 This is a schematic diagram of the structure of the multi-level controller according to an embodiment of the present invention;

[0028] Figure 2 A schematic diagram of the movable sleeve and track groove;

[0029] Figure 3This is a schematic diagram of the structure of the multi-layer flow control device according to an embodiment of the present invention;

[0030] See attached diagram: 1. Mandrel, 2. Upper pressure hole, 3. Compression fitting assembly, 4. Anti-rotation screw, 5. O-ring, 6. Opening ring, 7. Upper cylinder, 8. Lower pressure hole, 9. Inner sleeve, 10. Seal, 12. Upper pressure hole, 13. Retaining ring, 15. Bearing, 18. Positioning cylinder, 19. Moving sleeve, 20. Positioning pin, 21. Lower cylinder, 22. Lower pressure hole, 26. Retaining ring, 27. Lower connector. Detailed Implementation

[0031] The invention will now be further described with reference to the accompanying drawings to better illustrate its usage. For ease of description, the direction pointing downwards along the central axis to the lower joint will be referred to as "downwards," and vice versa as "upwards."

[0032] See Figure 1 , Figure 1 The first embodiment of the present invention, a multi-position controller, is shown. This embodiment includes a mandrel, an upper cylinder, and an inner sleeve. An annular space is formed between the outer wall of the middle section of the mandrel and the inner wall of the upper cylinder; the inner sleeve, fitted onto the mandrel, is disposed in the annular space and can move axially up and down.

[0033] See Figure 1 The inner sleeve has three seals on its outer wall in the middle section: an upper seal, a middle seal, and a lower seal. These three seals form sealing surfaces with the inner wall of the upper cylinder, dividing the annular space between the outer wall of the inner sleeve and the inner wall of the upper cylinder into four sealing annular spaces. For ease of description, the four sealing annular spaces are named, from top to bottom, the first, second, third, and fourth sealing annular spaces.

[0034] Furthermore, the inner sleeve has three radially protruding sealing bosses distributed along the axial direction on the outer wall of the middle section. Each sealing boss has a sealing groove, and each sealing groove is equipped with a sealing component (preferably an O-ring), thereby forming three seals.

[0035] See Figure 1 The upper and lower ends of the inner sleeve are connected to the upper pressure hole and the lower pressure hole, respectively, that is, the upper pressure hole and the lower pressure hole are connected to the first and fourth sealing annulus holes, respectively; and can be connected to the well hydraulic system through the ferrule assembly and the ferrule pipe joint, respectively.

[0036] See Figure 1 The outer wall of the upper cylinder is provided with a boss, and the upper and lower side walls of the boss are respectively provided with an upper pressure transmission hole and a lower pressure transmission hole that connect to the annular space. Initially, the upper pressure transmission hole and the lower pressure transmission hole are connected to the second and third sealing annular spaces located on the upper and lower sides of the middle seal, respectively, and are not interconnected.

[0037] The lower outer wall of the inner sleeve is provided with a circumferentially oriented track groove. Further, see... Figure 2A movable sleeve is connected to the lower outer wall of the inner sleeve, and a recessed track groove is provided on the outer wall of the movable sleeve. In this embodiment, the upper side of the track groove is provided with one long groove and eight short grooves extending upward along the axial direction, and the long groove and short grooves correspond to the open and closed positions, respectively. At intervals between the long groove and short grooves on the lower side of the track groove, turning grooves are provided. An annular groove (circumferentially arranged) for connection and switching is also provided between the lower ends of the long groove and short grooves. The annular groove between the turning groove and the long groove and short groove is preferably an inclined groove, and the upper and lower walls of the inclined groove form inclined surfaces for contacting the positioning pin and guiding the switching.

[0038] The track groove is fitted with a circumferentially rotatable positioning cylinder. The inner wall of the positioning cylinder is provided with a positioning pin. The inner end of the positioning pin extends into the track groove and cooperates with the track groove to achieve sliding.

[0039] The positioning cylinder is located inside the lower cylinder, and the lower end of the upper cylinder is connected to the upper end of the lower cylinder. The upper outer wall of the lower connector is connected to the lower inner wall of the lower cylinder, and the upper inner wall of the lower connector is also connected to the lower outer wall of the mandrel. The lower outer wall of the lower connector is also provided with a retaining ring, and the upper end face of the retaining ring abuts against the lower end face of the lower cylinder.

[0040] Preferably, bearings are provided at both the upper and lower ends of the positioning cylinder. The bearings are located between the lower end face of the upper cylinder and the upper end face of the positioning cylinder, and between the lower end face of the positioning cylinder and the upper end face of the inner protruding step on the inner wall of the lower cylinder, respectively. The bearings effectively reduce the friction and wear caused by the passive rotation of the positioning cylinder during the up-and-down movement of the inner sleeve; they also make the sliding of the positioning pin within the track groove smoother. The positioning cylinder is axially confined within the aforementioned structural space and can only rotate circumferentially under the guidance of the track groove of the inner sleeve.

[0041] Preferably, the upper outer wall of the inner sleeve is provided with an open annular groove, and an open annular ring is provided in the open annular groove to prevent displacement during lowering. Initially, the open annular ring expands radially, and its inner and outer sides are respectively engaged in the open annular groove and the inner wall annular groove of the upper cylinder, forming a limiting structure for the inner sleeve. Further, the lower edge of the inner wall annular groove is provided with a retaining bevel angle corresponding to the open annular ring. After the upper end of the inner sleeve is subjected to sufficient pressure and moves downward, the retaining bevel angle and the contact surface of the lower side of the open annular ring generate an elastic force along the inclined plane, of which the radial component of the force causes the open annular ring to contract, thereby disengaging the open annular ring from the inner wall annular groove and releasing the axial restriction on the inner sleeve, allowing the inner sleeve to move downward.

[0042] As a preferred option, see Figure 1 In this embodiment, anti-rotation screws are provided between the outer wall of the mandrel and the inner wall of the upper end of the upper cylinder, between the outer wall of the lower end of the mandrel and the inner wall of the upper end of the lower connector, between the outer wall of the inner sleeve and the inner wall of the movable sleeve, in the anti-rotation groove provided at the upper end of the lower cylinder corresponding to the lower end of the upper cylinder, and between the outer wall of the lower connector and the inner wall of the retaining ring, to maintain the stability of the structure and prevent loosening.

[0043] As a preferred option, see Figure 1 Sealing components are provided between the upper inner wall of the inner sleeve (located in the space between the first sealing ring) and the outer wall of the mandrel, between the lower end of the upper cylinder and the upper end of the lower cylinder, between the lower inner wall of the lower cylinder and the upper outer wall of the lower connector, and between the upper inner wall of the lower connector and the lower outer wall of the mandrel, forming a sealing structure. Furthermore, the sealing components can be a single O-ring or a retaining ring-O-ring-retaining ring structure.

[0044] Initially, the positioning pin is located in the steering groove on the lower side of the track groove, the inner sleeve does not descend (and is limited), the connection between the upper and lower pressure transmission holes is separated by the middle seal, and the multi-position controller is in the closed state.

[0045] When switching gears / activating the tool after it has been lowered into the well, apply hydraulic pressure to the upper pressure hole at the top of the mandrel from the wellhead. The force generated in the air of the first sealing ring pushes the inner sleeve downward. At the same time, the groove angle releases the restriction of the opening ring on the inner sleeve, and hydraulic pressure continues to be applied to push the inner sleeve downward.

[0046] As the inner sleeve moves downward, the track groove moves downward relative to the positioning pin. The positioning pin, starting from the turning groove on the lower side of the track groove, is guided through the obliquely set annular groove / incline and enters the next adjacent long / short groove on the upper side of the track groove. Simultaneously, the positioning pin, through contact with the annular groove / incline, drives the positioning cylinder to rotate circumferentially by the corresponding angle. When the positioning pin slides to the upper end of the long groove, the inner sleeve moves axially downward a distance equal to the length of the long groove. The middle seal of the inner sleeve descends and passes the lower pressure transmission hole (i.e., located below it). At this time, the upper and lower pressure transmission holes simultaneously connect to the second sealing annular space after descending, and the lower pressure transmission hole no longer connects to the third sealing annular space (isolated by the middle seal), and the multi-position controller is in the open state. Because the pressure transmission lines connected to both ends of the upper cylinder boss are connected, hydraulic pressure can be applied to the lower flow control tool through the flow control line to control its opening and closing.

[0047] When the locating pin slides to the upper end of each short groove, the inner sleeve moves downward along the axial direction by a distance equal to the length of the short groove. Since the downward distance of the inner sleeve is relatively short, the middle seal does not pass over the lower pressure transmission hole. Therefore, the upper and lower pressure transmission holes are still separated by the sealing ring of the middle seal, and the two are not connected. The flow control pipeline cannot control the opening and closing of the flow control tool, so it is in the closed state.

[0048] In this embodiment, the track groove has one long groove, corresponding to the open position; and eight short grooves, corresponding to the closed position. The track groove has only one long groove, while the number of short grooves can be specifically selected according to the number of oil layers. The above-mentioned number setting is not intended to limit the invention.

[0049] When a gear shift is required, hydraulic pressure is applied through the wellhead to the lower pressure hole located at the lower end of the upper cylinder. The force generated in the fourth sealing ring pushes the inner sleeve upward. The locating pin, starting from the upper end of the long / short groove on the upper side of the track groove, is guided through the next obliquely set annular groove / incline and enters the next turning groove. The inner sleeve temporarily returns to its initial height position. Then, hydraulic pressure is applied again to the upper pressure hole at the upper end of the mandrel, pushing the inner sleeve downward again, causing the locating pin to slide along the track groove into the next long / short groove. Simultaneously, the locating cylinder rotates circumferentially by the corresponding angle.

[0050] As hydraulic pressure is continuously applied to both ends of the inner sleeve, the locating pin slides circumferentially along the track groove, changing gears. Each time the inner sleeve completes one of the aforementioned "downward-upward-downward" cycles, it completes a gear change; the specific number of gears can be adjusted according to requirements. In this embodiment, after the locating pin slides one full circle along the track groove and returns to the starting point, only one of the several gears changed during this period is in the open state (when entering a long slot), while the others are in the closed state (when entering short slots).

[0051] In this embodiment, pressure is applied to both ends of the inner sleeve to drive its up-and-down movement. This movement is then synchronized with the central seal on the outer wall of the inner sleeve, achieving both isolation and connection between the upper and lower pressure transmission holes, thus functioning as a switch for the flow control tool. Simultaneously, the interaction between the track groove and the positioning pin allows for sliding switching between long and short grooves, enabling the switching between different on / off positions.

[0052] See Figure 3 , Figure 3 The second embodiment of the present invention is a multi-layer flow control device, which includes several multi-position controllers (used as switches) as described in the first embodiment, several flow control tools, and three pipelines: an upper liquid control pipeline, a lower liquid control pipeline, and a flow control pipeline.

[0053] The system comprises several multi-level controllers and corresponding flow control tools paired into several groups (each group contains one tool), with the number of groups corresponding to the number of oil layers. In this embodiment, during assembly, the number of long and short slots on the track groove should be set according to the number of oil layers. Furthermore, the unique long slot in each multi-level controller should be staggered in the gear sequence (i.e., located at different circumferential angles. Of course, if it is necessary to open several oil layers simultaneously, some can be set to overlap, which should not be considered a limitation of this invention). This ensures that after each switch during use, only one multi-level controller's positioning pin is in the open state due to entering the long slot, while the positioning pins of the remaining multi-level controllers are in the closed state within the short slots.

[0054] See Figure 3The upper liquid control line connects to the upper pressure port of each multi-position controller via several pipes, while the lower liquid control line connects to the lower pressure port of each multi-position controller via several pipes. As described in the first embodiment, the switching of each multi-position controller requires continuous reciprocating hydraulic pressure to both ends of the inner sleeve. In this embodiment, based on the aforementioned pipe connection relationship, each pressure pressurization of the upper liquid control line (which serves as the main line) causes the inner sleeves of all multi-position controllers connected to the branch lines to move downwards, while each pressure pressurization of the lower liquid control line (which serves as the main line) causes the inner sleeves of all multi-position controllers on the branch lines to move upwards. Each cycle of the positioning pin in the track groove causes all multi-position controllers to synchronously switch to one position.

[0055] Furthermore, the flow control line is connected to the upper pressure port of each multi-stage controller via several pipes, and the lower pressure port of each multi-stage controller is connected to the opening end of its paired flow control tool via several pipes, with the flow control tool connecting to the corresponding oil layer. In addition, the lower fluid control line is also connected to the closing end of the flow control tool via several other pipes.

[0056] The flow control tool in this embodiment employs existing technology. When one multi-position controller is activated, the flow control line applies hydraulic pressure through the upper pressure port. The hydraulic pressure then flows through the upper pressure port, the second sealing annulus, and the lower pressure port of that multi-position controller into the flow control tool group. The aforementioned pathways for other multi-position controllers in the closed state are not connected, and the hydraulic pressure from the flow control line cannot control the flow control tools in other groups. During gear shifting, the lower fluid control line applies hydraulic pressure to the closed end of the flow control tool simultaneously, pushing the inner sleeves of each multi-position controller upwards and closing them. Initially, the positioning pins of each multi-position controller are located in their respective steering grooves, and none of the inner sleeves have descended; all multi-position controllers are in the closed state. After the entire tool set is lowered into the well, the upper fluid control line simultaneously applies hydraulic pressure through each upper pressure port, causing the inner sleeves to descend synchronously. The positioning pin of one multi-position controller enters the long groove, opening the multi-position controller, allowing operation of the oil layer using the flow control line. Meanwhile, the positioning pins of the other multi-position controllers each enter the short slots of their respective positions, maintaining the closed state.

[0057] When shifting gears or opening another oil layer, hydraulic pressure is simultaneously applied through the lower hydraulic control line and each lower pressure port to pressurize the system, causing the inner sleeves to move upwards synchronously. The previous multi-gear controller is turned off, while the other multi-gear controllers remain off. Subsequently, pressure is applied through the upper hydraulic control line, causing the inner sleeves to move downwards again, turning on the next multi-gear controller and opening another oil layer, or continuously switching to open the specific oil layer required.

[0058] During this process, each multi-gear controller simultaneously slides along the track and shifts gears, ensuring that only one flow control device is always on during gear shifting, while the others are off. Several multi-gear controllers are sequentially activated during gear shifting; the activation order can be set during assembly as needed. To avoid confusion in the gear sequence, a complete gear shift is required from activation to deactivation. After the entire cycle is completed, the system returns to its initial state, and all multi-gear controllers deactivate again.

[0059] This embodiment utilizes a multi-position controller and flow control tools with staggered positions connected in series downhole. Only three hydraulic control lines are needed to control the switching of several (n) flow control tools. After multiple cycles of pressurization, a specific oil layer can be opened individually, meeting the needs of individual extraction. The number of hydraulic control lines is no longer in a two-to-one relationship with the number of flow control tools, and remains consistently three, significantly reducing the number of lines and facilitating downhole layout. Furthermore, the position of the positioning cylinder can be adjusted according to the number of tools to be controlled, precisely controlling the switching of tools at different levels.

[0060] The embodiments of the present invention have been described above with reference to the accompanying drawings and examples. The structures given in the embodiments do not constitute a limitation of the present invention. Those skilled in the art can make adjustments as needed, and various modifications or variations within the scope of the appended claims are all within the scope of protection.

Claims

1. A multi-position controller, characterized in that: It includes a mandrel, an upper cylinder and an inner sleeve, wherein the inner sleeve is located in the annular space between the outer wall of the mandrel and the inner wall of the upper cylinder and can move axially; the upper end and the lower end of the inner sleeve are respectively connected to the upper pressure hole and the lower pressure hole; The inner sleeve has three seals on its outer wall in the middle, which form sealing surfaces with the inner wall of the upper cylinder, dividing the annular space into four sealing annular spaces; the side wall of the upper cylinder has an upper pressure transmission hole and a lower pressure transmission hole that connect to the annular space. The outer wall of the inner sleeve is provided with a track groove arranged circumferentially. The upper side of the track groove is provided with a long groove and several short grooves extending axially upward, and the lower side of the track groove is provided with a turning groove. There is also an annular groove for switching between the long / short grooves and the turning groove. The track groove is fitted with a circumferentially rotatable positioning cylinder, and the inner wall of the positioning cylinder is provided with a positioning pin that slides with the track groove.

2. The multi-level controller according to claim 1, characterized in that: The lower end of the inner sleeve is connected to a movable sleeve, and the track groove is located on the outer wall of the movable sleeve.

3. The multi-level controller according to claim 1, characterized in that: The lower end of the upper cylinder is connected to the upper end of the lower cylinder, and the positioning cylinder is located inside the lower cylinder; and / or, bearings are provided at both ends of the positioning cylinder.

4. The multi-level controller according to claim 3, characterized in that: The upper outer wall of the lower connector is connected to the lower inner wall of the lower cylinder, and the upper inner wall of the lower connector is connected to the lower outer wall of the mandrel. And / or, the lower outer wall of the lower connector is provided with a retaining ring, and the upper end face of the retaining ring abuts against the lower end face of the lower cylinder.

5. The multi-position controller according to claim 1, characterized in that: The upper outer wall of the inner sleeve is provided with an open annular groove, and an open annular ring is provided in the open annular groove to prevent displacement during lowering. The open annular ring expands radially and is stuck in the inner wall annular groove of the upper cylinder. The lower edge of the inner wall annular groove is provided with a corresponding slot angle to the open annular ring.

6. The multi-position controller according to any one of claims 1-5, characterized in that: Anti-rotation screws are provided between the outer wall of the mandrel and the inner wall of the upper cylinder; And / or, an anti-rotation screw is provided between the lower outer wall of the mandrel and the upper inner wall of the lower connector; And / or, an anti-rotation screw is provided between the outer wall of the inner sleeve and the inner wall of the movable sleeve; And / or, an anti-rotation screw is provided between the upper end of the lower cylinder and the lower end of the upper cylinder; And / or, an anti-rotation screw is provided between the outer wall of the lower connector and the inner wall of the retaining ring.

7. The multi-position controller according to any one of claims 1-5, characterized in that: The inner sleeve has three sealing bosses distributed axially along the outer wall of the middle section. Each sealing boss has a sealing groove, and each sealing groove is equipped with a sealing component to form three seals. And / or, a sealing ring is provided between the upper inner wall of the inner sleeve and the outer wall of the mandrel; And / or, a sealing assembly is provided between the lower end of the upper cylinder and the upper end of the lower cylinder; And / or, a sealing assembly is provided between the lower inner wall of the lower cylinder and the upper outer wall of the lower connector; And / or, a sealing assembly is provided between the upper inner wall of the lower connector and the lower outer wall of the mandrel.

8. A multi-layer oil flow control device, characterized in that: It includes several sets of multi-position controllers and flow control tools as described in any one of claims 1-7, with the number of sets corresponding to the number of oil layers; it also includes upper fluid control pipelines, lower fluid control pipelines, and flow control pipelines; The upper liquid control line is connected to the upper pressure hole of each multi-position controller, and the lower liquid control line is connected to the lower pressure hole of each multi-position controller. The flow control pipelines are connected to the upper pressure port of each multi-stage controller, and the lower pressure port of each multi-stage controller is connected to the flow control tool of the corresponding oil layer. Initially, the positioning pins of each multi-position controller are located in their respective steering slots, and all multi-position controllers are in the off state. During use, the upper liquid control line is pressurized simultaneously to move each inner sleeve downwards, and then the lower liquid control line is pressurized simultaneously to move each inner sleeve upwards. Each multi-position controller switches positions simultaneously, ensuring that one flow control tool is always in the on state during the process. After the cycle is completed, it returns to the initial state and is turned off again.

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