Intelligent well underground cable and hydraulic control pipeline butt joint tool and butt joint method

Abstract

The invention discloses an intelligent well underground cable and hydraulic control pipeline butt joint tool and a butt joint method, and belongs to the technical field of intelligent operation tools. The tool includes a separable docking assembly and a letting-in tool. The butt joint assembly is provided with a central shaft, a locking mechanism, a movable sleeve and an insulation connecting assembly. The letting-in tool is provided with a letting-in shell, a conductive valve element, an insulating protective sleeve and a hydraulic compensation mechanism. During butt joint, the butt joint assembly is inserted into a well leaving tool, and the conductive elastic sleeve makes contact with the conductive valve element to achieve cable connection. Meanwhile, the movable sleeve acts to enable hydraulic control holes of all parts to be aligned, and communication of a plurality of hydraulic control pipelines is achieved; the hydraulic compensation mechanism injects insulating oil into the butt joint cavity to guarantee insulation. And the locking mechanism is used for locking to complete butt joint. Rapid, safe and reliable butt joint and separation of the cable and the hydraulic control pipeline are achieved, and the efficiency and economical efficiency of maintenance operation of an intelligent well completion system are remarkably improved.

Description

Technical Field

[0001] This invention relates to intelligent well completion systems, and particularly to a tool for connecting intelligent well downhole cables and hydraulic control lines. This invention also relates to a method for connecting intelligent well downhole cables and hydraulic control lines, belonging to the technical field of intelligent operation tools. Background Technology

[0002] Intelligent well completion technology enables real-time monitoring and control of downhole production status by deploying monitoring and control equipment downhole and connecting it to the surface via cables and hydraulic control lines. Currently, downhole flow control devices often employ an electro-hydraulic hybrid drive method, which requires both electrical and signal transmission via cables and hydraulic control signals via hydraulic control lines.

[0003] However, existing technologies have significant shortcomings: when downhole production systems require maintenance (such as pump inspection), or when malfunctions occur such as signal loss or hydraulic control line leaks, the entire downhole tubing and tools must be pulled to the surface for repair or replacement. This method is time-consuming, labor-intensive, and costly, severely impacting production efficiency. Furthermore, existing downhole docking tools are limited in function, typically only capable of docking hydraulic control lines, failing to meet the technical requirements for simultaneous and reliable docking of cables and multiple hydraulic control lines. This restricts the convenience and cost-effectiveness of maintaining intelligent well completion systems.

[0004] Therefore, developing a specialized tool capable of quickly and safely connecting and disconnecting cables and multiple hydraulic pipelines in a single operation has become a pressing technical problem in this field. Summary of the Invention

[0005] The purpose of this section is to outline some aspects of embodiments of the present invention and to briefly describe some preferred embodiments. Simplifications or omissions may be made in this section, as well as in the abstract and title of this application, and such simplifications or omissions should not be construed as limiting the scope of the invention.

[0006] In view of the problems existing in the above and / or prior art, the present invention is proposed.

[0007] The primary objective of this invention is to overcome the problems existing in the prior art and provide an intelligent wellbore cable and hydraulic control line docking tool that can achieve rapid separation and docking of downhole production tubing and simultaneously complete the reliable connection of multiple hydraulic control lines and downhole cables.

[0008] To achieve the above objectives, the present invention adopts the following technical solution: A smart wellbore downhole cable and hydraulic control line docking tool includes a docking assembly connected to the tubing and a well-staying tool fixed to the downhole string. The docking assembly includes: A central shaft has an axially provided central shaft cable through hole and at least one central shaft hydraulic through hole, and a radially provided central shaft radial hole communicating with the central shaft hydraulic through hole; A locking mechanism, installed on the upper part of the central shaft, is used to lock with the well-keeping tool; A movable sleeve is fitted onto the lower part of the central shaft by a movable sleeve spring. The movable sleeve has a radial hole on its circumference. When the movable sleeve is pressed and moves upward, the radial hole of the movable sleeve is aligned with the radial hole of the central shaft. An insulating connection assembly is connected to the lower end of the central shaft, including an insulating upper connector, a conductive elastic sleeve, and an insulating lower connector; the conductive elastic sleeve is fitted around the outer periphery of the insulating upper connector, and the upper cable passes through the cable passage hole of the central shaft and is electrically connected to the conductive elastic sleeve.

[0009] Furthermore, the well-keeping tool includes: A well casing, the upper end of which is connected to the well upper connector, and the well casing radial hole is provided in the radial direction, and the lower part of which is provided with at least one well casing hydraulic guide hole; A well-holding sleeve is installed inside the well-holding housing via a sleeve spring. The sleeve has a radial hole on its circumference. When the docking assembly is inserted and pushes the well-holding sleeve downward, the radial hole of the sleeve aligns and communicates with the radial hole of the well-holding housing. An insulating protective sleeve is slidably disposed on the lower part of the well casing, and an insulating oil cavity is formed between its outer wall and the inner wall of the well casing. The insulating oil cavity is connected to the hydraulic through hole of the well casing. A conductive valve core is installed in the radial hole of the well casing, and its inner end is initially sealed by the insulating protective sleeve. The lower cable is electrically connected to the inside of the conductive valve core.

[0010] Furthermore, when the docking assembly docks with the well-keeping tool, the insulating lower connector pushes the insulating protective sleeve downward, exposing the inner end of the conductive valve core and making it contact with the conductive elastic sleeve to achieve electrical connection; at the same time, the radial holes of the moving sleeve, the radial holes of the central shaft, the radial holes of the sliding sleeve, and the radial holes of the well-keeping outer shell are aligned and connected in sequence to form a hydraulic control channel.

[0011] Furthermore, the locking mechanism includes a locking pawl fitted on the upper part of the central shaft and a limiting sleeve threadedly connected to the central shaft. The locking pawl engages with the central shaft through an axial groove and a protrusion to restrict its circumferential rotation.

[0012] Furthermore, the upper end of the wellhead connector is provided with a reverse thread. When the docking is completed, the locking pawl engages with the reverse thread at the upper end of the wellhead connector to lock it. A limit ring is fixed on the central shaft by a shear pin, which is used to cut the shear pin to release the lock when the device is released.

[0013] Furthermore, the insulating connection assembly also includes a closing elastic sleeve, which is fitted onto the lower part of the insulating lower connector and connected by threads; the closing elastic sleeve has an outer protrusion on the outer periphery of the middle part; when the tool is separated and lifted, the outer protrusion of the closing elastic sleeve can hook onto the inner step at the upper end of the insulating protective sleeve, causing the insulating protective sleeve to move upward and reset, resealing the conductive valve core.

[0014] Furthermore, the well-keeping tool also includes a hydraulic compensation mechanism, which comprises: A well-entry connector is connected to the lower end of the well-entry shell, and the step inside its central hole provides a drop limit for the insulating protective sleeve. A piston is disposed within a hydraulic cavity formed by the pressure transmission sleeve and the outer wall of the downhole connector; The well-staying connector is provided with an axial hole, and the hydraulic through hole of the well-staying shell is connected to the axial hole of the well-staying connector through a pressure transmission pipeline; The chamber above the piston is pre-filled with insulating oil. When the insulating protective sleeve moves down to open the conductive valve core, the wellbore pressure pushes the piston upward, squeezing the insulating oil into the insulating oil chamber.

[0015] Furthermore, the lower outer periphery of the insulating protective sleeve is provided with an expanded diameter section, and an elastic locking ring is embedded in its annular groove. The outer periphery of the elastic locking ring is embedded in the annular groove of the lower central hole of the well casing, which is used to fix the insulating protective sleeve in the initial state; when the insulating protective sleeve is pushed downward, the elastic locking ring retracts and unlocks.

[0016] Furthermore, the upper outer periphery of the movable sleeve is provided with an outer step, which is used to abut against the inner step of the upper connector at the lower end of the well-dwell connector during docking, forcing the movable sleeve to compress the movable sleeve spring and move upward.

[0017] Another objective of this invention is to overcome the problems existing in the prior art and provide a method for connecting intelligent well downhole cables and hydraulic control lines, which can realize the rapid separation and connection of downhole production tubing and simultaneously complete the reliable connection of multiple hydraulic control lines and downhole cables.

[0018] A method for connecting a smart well downhole cable and a hydraulic control line, using the aforementioned connection tool, includes the following steps: S1. Well-staying tool: The well-staying tool and the intelligent well downhole control string connected below it are lowered into the well to the designed position and left downhole; S2. Lowering the docking assembly: Connect the docking assembly to the lower end of the tubing and lower it into the well; S3. Tool docking: As the docking assembly continues to descend, its insulating lower connector pushes the insulating protective sleeve inside the well-keeping tool downward, opening the sealing surface of the conductive valve core. The hydraulic compensation mechanism injects insulating oil into the insulating oil chamber. Simultaneously, the conductive elastic sleeve contacts the inner end of the conductive valve core, achieving electrical connection. At the same time, the conversion connector of the docking assembly pushes the well-keeping sliding sleeve downward and causes the moving sleeve to move upward, ultimately aligning and connecting the radial holes of the moving sleeve, the central shaft, the sliding sleeve, and the well-keeping outer shell to form a hydraulic control channel. Finally, the locking mechanism activates, locking the docking assembly and the well-keeping tool together.

[0019] Furthermore, it also includes the following steps: S4. Release: When it is necessary to retrieve, lift the tubing string to the set load, cut the shear pin and release the locking mechanism; during the lifting process, close the elastic sleeve hook and drive the insulating protective sleeve to move upward and reset, reseal the conductive valve core, and then completely pull the docking assembly out of the wellhead.

[0020] Compared to the prior art, the advantages or beneficial effects of the embodiments of this application include at least the following: 1. It enables the synchronous, one-time connection and separation of cables and multiple hydraulic control pipelines, greatly simplifying the well workover process of the intelligent well completion system, improving operational efficiency, and reducing costs.

[0021] 2. The cable connection is set in an independent chamber that can be filled with insulating oil, which effectively ensures the electrical insulation performance and operational safety after connection.

[0022] 3. The hydraulic control pipeline docking channel is designed with springs and moving sleeves, ensuring a smooth docking process and effectively preventing impurities from entering the hydraulic control pipeline, thus guaranteeing the cleanliness and reliability of the hydraulic system.

[0023] 4. A forced shut-off mechanism (insulating protective sleeve) is provided, which can automatically seal the cable interface after the tool is separated, protecting the downhole cable and conductive components and extending their service life.

[0024] 5. It adopts a ratchet locking mechanism, which ensures reliable docking, and the release operation is simple and clear, allowing for multiple repeated docking. Attached Figure Description

[0025] To more clearly illustrate the technical solutions of the embodiments of the present invention, the accompanying drawings used in the description of the embodiments 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 drawings can be obtained based on these drawings without creative effort. The drawings are provided for reference and illustration only and are not intended to limit the present invention. Wherein: Figure 1This is a schematic diagram of the docking assembly in the docking tool of the present invention; Figure 2 This is a schematic diagram of the well-drilling tool in the docking tool of the present invention; Figure 3 for Figure 2 A cross-sectional view of the well-keeping tool along line AA; Figure 4 This is a schematic diagram showing the state of the docking tool of the present invention after docking is completed.

[0026] Explanation of reference numerals in the attached figures: Docking Assembly: 1. Upper Cable; 2. Central Shaft; 3. Limit Sleeve; 4. Locking Pawl; 5. Limit Ring; 6. Shear Pin; 7. Moving Sleeve Spring; 8. Moving Sleeve; 9. Adapter; 10. Sealing Fold; 11. Insulating Upper Connector; 12. Conductive Elastic Sleeve; 13. Insulating Lower Connector; 14. Closing Elastic Sleeve; 15. Central Shaft Hydraulic Through Hole; 16. Central Shaft Radial Hole; 17. Moving Sleeve Radial Hole; Well-keeping tools: 18. Well-keeping upper connector; 19. Well-keeping outer shell; 20. Well-keeping sliding sleeve; 21. Sliding sleeve radial hole; 22. Sliding sleeve spring; 23. Insulating protective sleeve; 24. Insulating plug; 25. Conductive valve core; 26. Well-keeping outer shell cable passage hole; 27. Cable connector; 28. Elastic locking ring; 29. ​​Well-keeping lower connector; 30. Pressure transmission sleeve; 31. Piston; 32. Lower cable; 33. Well-keeping outer shell hydraulic through hole; 34. Pressure transmission pipeline; 35. Well-keeping outer shell radial hole; 36. Well-keeping outer shell axial hole. Detailed Implementation

[0027] In the following description of the present invention, the terms "upper", "lower", "front", "rear", "left", "right", "inner", "outer", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, and do not mean that the device must have a specific orientation.

[0028] To make the technical means, creative features, objectives, and effects of this invention easier to understand, the invention is further described below with reference to specific illustrations. Obviously, the described embodiments are only a part of the embodiments of this invention, and not all of them.

[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 to which this invention pertains. The terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention.

[0030] like Figure 1As shown, the docking assembly of this invention includes a central shaft 2, a locking mechanism, a movable sleeve 8, and an insulating connection assembly. The central shaft 2 has an axially formed central shaft cable through hole and four central shaft hydraulic through holes 15, and a radially formed central shaft radial hole 16 communicating with the lower end of the central shaft hydraulic through holes 15. The locking pawl 4 engages with a protrusion on the upper outer periphery of the central shaft 2 through an axial groove on its inner wall, allowing it to move axially but not rotate. The upper internal thread of the limiting sleeve 3 connects to the upper external thread of the central shaft 2, and the inner step below the internal thread of the limiting sleeve 3 is used to limit the upper limit position of the locking pawl 4.

[0031] A limiting ring 5, a movable sleeve spring 7, and a movable sleeve 8 are sequentially fitted onto the lower outer circumference of the central shaft 2 from top to bottom. The middle part of the limiting ring 5 is fixed to the middle section of the outer circumference of the central shaft 2 by a shear pin 6. The movable sleeve spring 7 is supported between the outer step of the middle section of the central shaft 2 and the upper port of the movable sleeve 8. The lower end of the central shaft 2 is externally threaded and connected to the upper end of the adapter 9 internally threaded, and the upper port of the adapter 9 abuts against the lower port of the movable sleeve 8. The circumference of the movable sleeve 8 is provided with multiple rows of movable sleeve radial holes 17. The upper and lower sides of the inner port of each row of movable sleeve radial holes 17 are respectively fitted with movable sleeve inner sealing rings, and the upper and lower sides of the outer port of each row of movable sleeve radial holes 17 are respectively fitted with movable sleeve outer sealing rings. The upper outer circumference of the movable sleeve 8 is provided with a movable sleeve outer step. When the movable sleeve outer step is blocked downward, the movable sleeve 8 compresses the movable sleeve spring 7 and slides upward, and the inner port of the movable sleeve radial hole 17 will align and connect with the outer port of the central shaft radial hole 16.

[0032] The adapter 9 has a top-wide, bottom-narrow structure, with the bottom chamfered at the top large-diameter section forming an outer conical surface. The lower external thread of the adapter 9 connects to the upper internal thread of the insulating upper connector 11, and the lower external thread of the insulating upper connector 11 connects to the upper internal thread of the insulating lower connector 13. The upper end face of the insulating upper connector 11 has an axial cable hole extending downwards along the axial direction, and the lower end of the axial cable hole communicates with the outside through a radial cable hole.

[0033] The upper cable 1 descends along the central axis cable passage hole of the central axis 2, exits from the bottom of the central axis 2, continues through the through hole on the adapter 9, and enters the axial cable hole of the insulating upper connector 11. A sealing sleeve 10 is screwed onto the upper end of the axial cable hole to tightly seal the upper cable 1. The upper cable 1 descends along the axial cable hole of the insulating upper connector 11, and its conductive wires exit from the radial cable hole and are tightly wound in the annular groove on the outer wall of the insulating upper connector 11.

[0034] A conductive elastic sleeve 12 is fitted around the middle outer periphery of the insulating upper connector 11. The upper inner wall of the conductive elastic sleeve 12 is in contact with the conductive wire wound in the annular groove of the outer wall of the insulating upper connector 11. The upper end of the conductive elastic sleeve 12 abuts against the lower outer step of the insulating upper connector 11, and the lower end of the conductive elastic sleeve 12 abuts against the upper port of the insulating lower connector 13.

[0035] The insulating lower connector 13 has a structure that is wider at the top and narrower at the bottom. The closing elastic sleeve 14 is fitted on the lower outer periphery of the insulating lower connector 13, and the upper internal thread of the closing elastic sleeve 14 is connected to the external thread of the middle section of the insulating lower connector 13.

[0036] After docking, the insulating protective sleeve 23 descends onto the step inside the center hole of the lower connector 29, and the closing elastic sleeve 14 is located inside the cavity of the insulating protective sleeve 23. The closing elastic sleeve 14 has an outer protrusion at its center periphery, and the upper inner wall of the insulating protective sleeve 23 has an inner step. The upper end of the closing elastic sleeve 14 is located above this inner step. When the closing elastic sleeve 14 moves upward with the lower insulating connector 13, the outer protrusion hooks onto the inner step, causing the insulating protective sleeve 23 to move upward.

[0037] like Figure 2 , Figure 3 As shown, the well-holding tool includes a well-holding upper connector 18, a well-holding outer shell 19, a conductive valve core 25, an insulating protective sleeve 23, and a hydraulic compensation mechanism. The upper port of the well-holding upper connector 18 has a reverse thread for engaging and locking with the locking pawl 4 after tool docking. The lower end of the inner wall of the well-holding upper connector 18 has an inwardly protruding inner step for limiting the movement of the outer step of the upper moving sleeve 8. The lower end of the well-holding upper connector 18 has an external thread that connects to the upper end of the well-holding outer shell 19, and the well-holding sliding sleeve 20 is located in the upper central hole of the well-holding outer shell 19. During installation, the sliding sleeve spring 22 and the well-holding sliding sleeve 20 are sequentially installed into the well-holding outer shell 19. The lower end of the well-holding sliding sleeve 20 has a reduced-diameter section, and the sliding sleeve spring 22 is fitted onto the outer circumference of the reduced-diameter section. The lower end of the reduced-diameter section is inserted into the central hole of the reduced-diameter section of the well-holding outer shell 19.

[0038] The lower part of the center hole of the well-retaining sleeve 20 is provided with an inner conical surface. The inner conical surface of the sleeve is located above the reduced diameter section of the sleeve and matches the outer conical surface of the adapter. The upper end of the sleeve spring 22 abuts against the lower part of the outer step of the well-retaining sleeve 20, and the lower end of the sleeve spring 22 abuts against the inner step of the well-retaining housing 19. When the outer conical surface of the adapter abuts against the inner conical surface of the sleeve, the adapter 9 pushes the well-retaining sleeve 20 downward, and the sleeve spring 22 is compressed.

[0039] The lower end of the manhole casing 19 has one cable passage hole 26 and four hydraulic through holes 33. The cable passage hole 26 extends upward from the lower end surface of the manhole casing 19, allowing the lower cable 32 to pass through. The four hydraulic through holes 33 extend upward from the lower end surface of the manhole casing 19 and then radially inward, for supplying insulating oil to the cable connection point. The upper inner peripheral wall of the manhole casing 19 has a radial hole 35. The outer port of the radial hole 35 communicates with the upper port of the axial hole 36. The axial hole 36 extends downward along the axial direction of the manhole casing 19 to its lower end face outlet.

[0040] Initially, the well-holding sleeve 20 seals the inner port of the radial hole 35 of the well-holding outer shell under the action of the sleeve spring 22. The well-holding sleeve 20 has multiple rows of through sleeve radial holes 21 on its circumference. The inner port of each sleeve radial hole 21 is connected to the outer port of the corresponding moving sleeve radial hole 17. The outer port of the sleeve radial hole 21 is used to dock with the radial hole 35 of the well-holding outer shell.

[0041] The lower central hole of the well casing 19 continues to narrow, and the insulating protective sleeve 23 is installed in the lower central hole of the well casing 19. The middle section of the insulating protective sleeve 23 has a narrowed section on its outer periphery. The narrowed section of the insulating protective sleeve is opposite to the recessed section of the lower central hole of the well casing 19, and the enclosed annular space serves as an insulating oil cavity. The upper and lower sides of the narrowed section of the insulating protective sleeve are respectively fitted with an outer sealing ring of the insulating protective sleeve to keep the upper and lower sides of the insulating oil cavity sealed.

[0042] The lower outer periphery of the insulating protective sleeve 23 is provided with an expanded diameter section, the upper end of which abuts against the inner step below the central hole of the lower part of the well casing 19. An elastic locking ring 28 is embedded in the annular groove of the expanded diameter section, and the outer periphery of the elastic locking ring 28 is embedded in the annular groove of the central hole of the lower part of the well casing 19 to prevent the insulating protective sleeve 23 from slipping out during well insertion. When the insulating protective sleeve 23 is subjected to a thrust from above, the elastic locking ring 28 retracts and unlocks, allowing the insulating protective sleeve 23 to slide axially downward.

[0043] The upper end of the conductive valve core 25 is located in the radial hole at the lower part of the well casing 19. An insulating plug 24 is screwed onto the outer port of the radial hole to seal the outer port of the radial hole. The inner end of the conductive valve core 25 communicates with the insulating oil cavity. Initially, the conductive valve core 25 is sealed by the insulating protective sleeve 23.

[0044] The lower external thread of the well casing 19 is connected to the upper internal thread of the well lower connector 29. The lower middle part of the center hole of the well lower connector 29 is provided with an inner step to provide a lower limit for the insulating protective sleeve 23 after it is lowered.

[0045] The outer periphery of the downhole connector 29 is fitted with a pressure transmission sleeve 30. The upper end of the pressure transmission sleeve 30 abuts against the lower outer step of the downhole connector 29. The lower internal thread of the pressure transmission sleeve 30 is connected to the middle external thread of the downhole connector 29. The lower external thread of the downhole connector 29 is used to connect with the lower pipe string.

[0046] The middle inner wall of the pressure transmission sleeve 30 and the middle outer wall of the downhole connector 29 form a hydraulic cavity. The upper inner wall of the pressure transmission sleeve 30 is fitted with a pressure transmission sleeve sealing ring to achieve a seal with the upper outer wall of the downhole connector 29. A piston 31 is provided in the hydraulic cavity. The lower end of the piston 31 abuts against the inner step of the pressure transmission sleeve 30. The outer periphery of the piston 31 is fitted with an outer piston sealing ring to seal against the middle inner wall of the pressure transmission sleeve 30. The inner periphery of the piston 31 is fitted with an inner piston sealing ring to seal against the middle outer wall of the downhole connector 29.

[0047] The pressure transmission sleeve 30 has an axial hole that runs through the thick wall. The upper end of the axial hole of the pressure transmission sleeve is aligned with and runs through the lower end of the axial hole of the well-end connector. The axial hole of the well-end connector runs through the upper large-diameter end of the well-end connector 29.

[0048] The lower cable 32 passes through the axial hole of the pressure transmission sleeve 30 and the axial hole of the well-entry connector 29, and enters the cable passage hole 26 at the lower end of the well-entry housing 19. The lower end of the cable passage hole 26 is screwed with a cable connector 27 to fix and seal the lower cable 32. The conductive wire of the lower cable 32 is connected to the inside of the conductive valve core 25.

[0049] The hydraulic compensation mechanism includes a piston 31, a pressure-transmitting sleeve 30, and a pressure-transmitting pipeline 34. The inner ports of the hydraulic through holes 33 on each well casing are bent inward and communicate with the insulating oil chamber. The outer ports of the hydraulic through holes 33 on each well casing are connected to the outer ports of the corresponding axial holes of the well casing joints via the pressure-transmitting pipeline 34. The upper chamber of the piston 31 is pre-filled with insulating oil. The insulating oil can flow into the insulating oil chamber between the insulating protective sleeve 23 and the well casing 19 through the axial hole of the well casing joint, the pressure-transmitting pipeline 34, and the hydraulic through holes 33 on the well casing.

[0050] The connection method for intelligent well downhole cables and hydraulic control lines is as follows: S1. Running in the well-keeping tool: Connect the smart well downhole control string below the well-keeping tool and run it into the well to the designed position via tubing. Then, pull out the tubing, leaving the well-keeping tool and below it downhole.

[0051] S2. Run the docking assembly: Connect the docking assembly to the lower end of the tubing and run it into the well until it enters the well-keeping tool.

[0052] S3. Tool Docking: The docking assembly continues to descend. The lower end of the insulating lower connector 13 first pushes the insulating protective sleeve 23 downward. The elastic locking ring 28 retracts into the outer circumferential groove of the expanded diameter section of the insulating protective sleeve, and descends with the insulating protective sleeve 23. When the insulating protective sleeve 23 moves away from the sealing surface of the conductive valve core 25, the wellbore pressure pushes the piston 31 upward, squeezing the insulating oil. The insulating oil flows into the docking area through the pressure transmission pipeline 34 and the hydraulic guide hole 33 of the well casing. The docking area is the annular space formed by the insulating lower connector 13, the conductive elastic sleeve 12, the insulating upper connector 11, and the well casing 19. The original well fluid is replaced to ensure insulation. Finally, the conductive elastic sleeve 12 reliably contacts the inner end of the conductive valve core 25, realizing the electrical connection between the upper cable 1 and the lower cable 32. The bottom of the insulating protective sleeve 23 falls to the lower inner step of the center hole of the well lower connector 29 and stops.

[0053] Simultaneously, the conversion connector 9 pushes the well-holding sleeve 20 to compress the sleeve spring 22 and move downward, exposing the well-holding outer shell radial hole 35 on the well-holding outer shell 19. That is, the inner port of the well-holding outer shell radial hole 35 is aligned and connected with the outer port of the sleeve radial hole 21. When the upper part of the movable sleeve 8 abuts against the lower end of the well-holding upper connector 18 on the inner step of the well-holding upper connector, the movable sleeve 8 is obstructed and moves upward, compressing the movable sleeve spring 7, so that the movable sleeve radial hole 17 on the movable sleeve 8 is aligned with the central shaft radial hole 16 on the central shaft 2, the sleeve radial hole 21 on the well-holding sleeve 20, and the well-holding outer shell radial hole 35 on the well-holding outer shell 19, thereby realizing the connection of four independent hydraulic control pipeline channels.

[0054] After docking is completed, the locking pawl 4 engages with the reverse thread at the upper end of the wellhead connector 18. The tubing string is then lifted to a certain load, causing the locking pawl 4 to be opened by the protrusion on the central shaft 2, thus securing it firmly to the wellhead connector 18 and completing the locking process.

[0055] S4. Release: When it is necessary to retrieve the docking assembly, lift the tubing string to the set release load. The release load is transmitted through the locking pawl 4, shearing the shear pin 6. Continue lifting, and the locking pawl 4 moves to the release position, releasing its lock with the wellhead connector 18. During the lifting process, close the elastic sleeve 14 to push the insulating protective sleeve 23 upward until the elastic locking ring 28 springs back and locks in the annular groove of the lower center hole of the wellhead housing 19, resealing the conductive valve core 25. Finally, the docking assembly can be completely pulled out of the wellhead, and the wellhead tool is restored to the docking-ready state.

[0056] The above description is merely a preferred embodiment of the present invention, showing and describing the basic principles, main features, and advantages of the present invention. It is not intended to limit the scope of patent protection of the present invention. Those skilled in the art should understand that the present invention is not limited to the above embodiments. In addition to the above embodiments, the present invention may have other implementations without departing from the spirit and scope of the invention. Various changes and modifications to the present invention are possible, and all technical solutions formed by equivalent substitutions or equivalent transformations fall within the scope of protection claimed by the present invention. The scope of protection of the present invention is defined by the appended claims and their equivalents. Technical features not described in the present invention can be implemented by or using existing technology, and will not be elaborated here.

Claims

1. A smart wellbore cable and hydraulic control line docking tool, comprising a docking assembly connected to the tubing and a well-staying tool fixed to the downhole string, characterized in that, The docking assembly includes: A central shaft (2) has a central shaft cable through hole and at least one central shaft hydraulic through hole (15) in its axial direction, and a central shaft radial hole (16) communicating with the central shaft hydraulic through hole (15) in its radial direction. A locking mechanism is installed on the upper part of the central shaft (2) for locking with the well-keeping tool; A movable sleeve (8) is fitted onto the lower part of the central shaft (2) by a movable sleeve spring (7). The movable sleeve (8) has a movable sleeve radial hole (17) on its circumference. When the movable sleeve (8) is pressed and moves upward, the movable sleeve radial hole (17) aligns with the central shaft radial hole (16). An insulating connection assembly is connected to the lower end of the central shaft (2) and includes an insulating upper connector (11), a conductive elastic sleeve (12), and an insulating lower connector (13). The conductive elastic sleeve (12) is fitted around the outer periphery of the insulating upper connector (11), and the upper cable (1) passes through the cable passage hole of the central shaft and is electrically connected to the conductive elastic sleeve (12).

2. The intelligent wellbore cable and hydraulic control pipeline docking tool according to claim 1, characterized in that, The well-keeping tools include: A well casing (19) is connected at its upper end to a well upper connector (18), and is provided with a radial hole (35) for the well casing in the radial direction, and at least one hydraulic through hole (33) for the well casing at its lower part. A well-holding sleeve (20) is provided inside the well-holding housing (19) by means of a sleeve spring (22). A sleeve radial hole (21) is provided on its circumference. When the docking assembly is inserted and pushes the well-holding sleeve (20) to move down, the sleeve radial hole (21) is aligned and connected with the well-holding housing radial hole (35). An insulating protective sleeve (23) is slidably disposed at the lower part of the well casing (19), and an insulating oil cavity is formed between its outer wall and the inner wall of the well casing (19), and the insulating oil cavity is connected to the hydraulic through hole (33) of the well casing; A conductive valve core (25) is installed in the radial hole of the well housing (19), the inner end of which is initially sealed by the insulating protective sleeve (23), and the lower cable (32) is electrically connected to the inside of the conductive valve core (25).

3. The intelligent wellbore cable and hydraulic control pipeline docking tool according to claim 2, characterized in that: When the docking assembly docks with the well-keeping tool, the insulating lower connector (13) pushes the insulating protective sleeve (23) down, so that the inner end of the conductive valve core (25) is exposed and contacts the conductive elastic sleeve (12) to achieve electrical connection; at the same time, the radial hole (17) of the moving sleeve, the radial hole (16) of the central shaft, the radial hole (21) of the sliding sleeve and the radial hole (35) of the well-keeping shell are aligned and connected in sequence to form a hydraulic control channel.

4. The intelligent wellbore cable and hydraulic control pipeline docking tool according to claim 2, characterized in that: The locking mechanism includes a locking pawl (4) fitted on the upper part of the central shaft (2) and a limiting sleeve (3) threadedly connected to the central shaft (2). The locking pawl (4) and the central shaft (2) cooperate with the protrusion through an axial groove to restrict its circumferential rotation.

5. The intelligent wellbore cable and hydraulic control pipeline docking tool according to claim 4, characterized in that: The upper end of the well-mounted connector (18) is provided with a reverse thread. When the docking is completed, the locking pawl (4) is locked into the reverse thread at the upper end of the well-mounted connector (18). A limit ring (5) is fixed on the central shaft (2) by a shear pin (6) to cut the shear pin (6) to release the lock when the hand is released.

6. The intelligent wellbore cable and hydraulic control pipeline docking tool according to claim 2, characterized in that: The insulating connection assembly also includes a closing elastic sleeve (14), which is fitted onto the lower part of the insulating lower connector (13) and connected by threads; the closing elastic sleeve (14) has a closing elastic sleeve outer protrusion on the outer periphery of the middle part; when the tool is separated and lifted, the closing elastic sleeve outer protrusion can hook the inner step at the upper end of the insulating protective sleeve (23), drive the insulating protective sleeve (23) to move up and reset, and reseal the conductive valve core (25).

7. The intelligent wellbore cable and hydraulic control pipeline docking tool according to claim 2, characterized in that, The well-keeping tool also includes a hydraulic compensation mechanism, which comprises: A well-drainage connector (29) is connected to the lower end of the well-drainage housing (19), and the step inside the central hole of the connector provides a drop limit for the insulating protective sleeve (23); A piston (31) is disposed within a hydraulic cavity formed by the pressure transmission sleeve (30) and the outer wall of the downhole connector (29); The well-stayed connector (29) is provided with an axial hole for the well-stayed connector, and the hydraulic guide hole (33) of the well-stayed outer shell is connected to the axial hole of the well-stayed connector through the pressure transmission pipeline (34); The chamber above the piston (31) is pre-filled with insulating oil. When the insulating protective sleeve (23) moves down to open the conductive valve core (25), the wellbore pressure pushes the piston (31) upward, squeezing the insulating oil into the insulating oil chamber.

8. The intelligent wellbore cable and hydraulic control pipeline docking tool according to claim 2, characterized in that, The lower outer periphery of the insulating protective sleeve (23) is provided with an expanded diameter section, and an elastic locking ring (28) is embedded in its annular groove. The outer periphery of the elastic locking ring (28) is embedded in the annular groove of the lower central hole of the well casing (19) for fixing the insulating protective sleeve (23) in the initial state. When the insulating protective sleeve (23) is pushed down, the elastic locking ring (28) retracts and unlocks.

9. The intelligent wellbore downhole cable and hydraulic control pipeline docking tool according to claim 2, characterized in that, The upper outer periphery of the movable sleeve (8) is provided with an outer step, which is used to abut against the inner step of the upper connector at the lower end of the well-drain connector (18) during docking, forcing the movable sleeve (8) to compress the movable sleeve spring (7) and move upward.

10. A method for connecting a smart well downhole cable and a hydraulic control pipeline, using the connection tool as described in any one of claims 1 to 6, characterized in that, The steps are as follows: S1. Well-staying tool: The well-staying tool and the intelligent well downhole control string connected below it are lowered into the well to the designed position and left downhole; S2. Lowering the docking assembly: Connect the docking assembly to the lower end of the tubing and lower it into the well; S3, Tool docking: The docking assembly continues to descend, and its insulating lower connector (13) pushes the insulating protective sleeve (23) inside the well-keeping tool to move down, opening the sealing surface of the conductive valve core (25). The hydraulic compensation mechanism injects insulating oil into the insulating oil chamber. At the same time, the conductive elastic sleeve (12) contacts the inner end of the conductive valve core (25) to achieve electrical connection. Meanwhile, the conversion connector (9) of the docking assembly pushes the well-keeping sliding sleeve (20) down and moves the moving sleeve (8) up, so that the radial hole (17) of the moving sleeve, the radial hole (16) of the central shaft, the radial hole (21) of the sliding sleeve and the radial hole (35) of the well-keeping outer shell are aligned and connected to form a hydraulic control channel. Finally, the locking mechanism is activated to lock the docking assembly and the well-keeping tool.

11. The intelligent wellbore cable and hydraulic control pipeline docking tool according to claim 10, characterized in that, It also includes the following steps: S4, Release: When it is necessary to pull out, lift the tubing to the set load, cut the shear pin (6) and release the locking mechanism; during the lifting process, close the elastic sleeve (14) to hook and drive the insulating protective sleeve (23) to move up and reset, reseal the conductive valve core (25), and then completely pull the docking assembly out of the wellhead.

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