Automatic battery dismounting and replacing device for underground electric control tool without lifting tubular column

Abstract

The invention discloses an automatic battery replacing device for an underground electric control tool without lifting a tubular column, and belongs to the technical field of intelligent drilling and completion operation. The device comprises two core parts, namely a tool battery compartment short section and a battery dismounting and replacing tool, wherein the tool battery compartment short section consists of a male joint, a female joint, an outer oil pipe and an inner pipe column; the battery dismounting and replacing tool is composed of a remote monitoring module, an armored cable winding and unwinding module, a visual monitoring module, a butt joint guide mechanism, an electric drive lead screw actuator, a wedge-shaped radial expansion mechanism, a detachable battery bin and the like. According to the invention, the inner tubular column is reduced to guarantee the passing of downhole tools; the butt joint guide mechanism is matched with an inner pipe column guide groove to achieve positioning, and the positioning precision is improved by combining the visual monitoring module; the electric driving lead screw actuator drives the central shaft to displace, and the battery is grabbed and inserted through the wedge-shaped radial expansion mechanism; and the detachable battery compartment is electrically connected through a wet-type electrical plug. According to the invention, electric control tool battery replacement can be realized without lifting a tubular column, the cost and risk are effectively reduced, and the digital and intelligent operation capability is improved.

Description

Technical Field

[0001] This invention relates to the field of intelligent drilling and completion equipment technology, specifically to an automatic battery replacement device for downhole electrical control tools that do not require tubing. Background Technology

[0002] With the deepening of oil and gas exploration and development, the application of various drilling and completion downhole tools (including monitoring, operation, and control equipment) is becoming increasingly widespread. To meet the diverse needs of downhole parameter acquisition, operation execution, and status control, these tools typically need to be deployed downhole for extended periods and rely on a stable power supply. However, under the complex conditions of high temperature, high pressure, and multiphase fluids in deep wells, cable-driven power supply solutions suffer from high energy consumption, significant signal attenuation, and a sharp decline in stability with increasing well depth, making them unsuitable for long-term operational needs. Therefore, using temperature- and pressure-resistant power batteries to independently power downhole tools has become the mainstream solution. However, battery power will eventually be depleted, and the long-term continuous operation of these tools still faces the fundamental challenge of energy supply disruption.

[0003] To enable electrically controlled drilling and completion tools to operate downhole for extended periods, achieving battery replacement without removing the tubing string has become a critical technical challenge. This necessitates the design of a dedicated tool battery compartment section that can be anchored within the production tubing string and provides the structural foundation for the entire battery swapping system. The design of this section faces a core structural contradiction: it must simultaneously provide a stable compartment for the battery module and ensure passage for other downhole tools within a limited space. Therefore, the inner tubing must employ a variable diameter design, forming an enlarged lower section to accommodate the removable battery compartment, while maintaining a standard inner diameter at the top to ensure smooth passage of the tool string. Based on the above functional and structural analysis, a novel downhole battery swapping device is urgently needed. This device includes a tool battery compartment section serving as the downhole interface and a precisely fitted, run-in battery replacement tool. Furthermore, this device must meet the following functions and requirements during operation:

[0004] (1) Battery replacement can be completed without raising or lowering the tubing string and without interrupting normal well production, effectively shortening the operation cycle and reducing overall costs; the tool battery compartment section clearly divides the battery module mounting area and the tool passage area. The mounting area is equipped with a highly reliable electrical interface and mechanical locking mechanism, which can be integrated into the production tubing string as a maintenance-free permanent infrastructure.

[0005] (2) It has a high-precision downhole positioning function with dual protection and strong positioning stability; it can realize high-precision alignment of battery plug-in, and at the same time has excellent anti-vibration performance, ensuring stable and reliable electrical contact and completely eliminating the hidden danger of poor contact.

[0006] (3) It can be adapted to the complex downhole conditions of high pressure and high temperature in deep wells. The core expansion mechanism has reliable operation performance and can operate stably in extreme environments, eliminating the problem of operation failure.

[0007] (4) The modular design makes it easy to disassemble and repair components, and can be quickly adapted to different types of downhole working conditions, improving the versatility and maintenance convenience of the device.

[0008] By implementing the above functions and requirements, the cost and risk of applying intelligent drilling and completion technology can be effectively reduced, and the digitalization and intelligence capabilities of drilling and completion operations can be improved. Summary of the Invention

[0009] The purpose of this invention is to address the long-standing power supply problem faced by various downhole tools relying on power batteries. It provides an automatic battery replacement device for downhole electrically controlled tools that does not require raising and lowering the tubing for battery replacement, resolving the space conflict between battery storage and the need to pass through other downhole tools. The variable diameter design of the inner tubing establishes a fixed and reliable battery replacement station downhole. A through-hole is provided in the connecting frame chassis, allowing downhole gas to rise normally during the device's lowering process without affecting normal wellbore operations. The wellbore can maintain normal production status, significantly improving operational efficiency. The invention also addresses the problems of insufficient positioning accuracy and poor stability during device lowering by using a spring-loaded wheel-type limiting component hub that engages with the sliding guide groove of the inner tubing to form mechanical positioning, coupled with a visual monitoring module for monitoring. This invention provides dual protection for high-precision automatic positioning in the well; it improves upon the shortcomings of low battery plug alignment accuracy, weak vibration resistance, and poor electrical contact by using a wet electrical plug that automatically guides and aligns with the docking port for electrical connection. After being placed on the support platform, it exhibits excellent vibration resistance, ensuring accurate plug-in and stable electrical connection. It also solves the problem of traditional expansion mechanisms being prone to failure and lacking reliability in deep well high-pressure and high-temperature environments by employing a combination of an electrically driven screw actuator and a wedge-shaped radial expansion mechanism, ensuring stable and reliable expansion and contraction actions and adapting to complex working conditions. Furthermore, it addresses the shortcomings of modular design, cumbersome disassembly and maintenance, and poor adaptability. This invention has a high degree of modularity, with each component capable of independent disassembly and maintenance, resulting in stronger adaptability to different working conditions.

[0010] The technical solution adopted by this invention patent to solve its technical problem is as follows: An automatic battery replacement device for downhole electrically controlled tools that do not require tubing, comprising a tool battery compartment sub, a remote monitoring module, an armored cable retraction module, a visual monitoring module, a docking guide mechanism, an electrically driven lead screw actuator, a wedge-shaped radial expansion mechanism, a detachable battery compartment, a connecting frame, and a tool counterweight sub, characterized in that:

[0011] The tool battery compartment section consists of a male connector, an outer oil pipe, an inner tubing, and a female connector. The male connector comprises a threaded section I, a threaded blind hole I, and a conical sealing pair I. Threaded section I mates with threaded section III. The male connector is bolted to the outer oil pipe via the threaded blind hole I and the threaded through hole I. The male connector is also connected to the upper oil pipe via the conical sealing pair I. The outer oil pipe has threaded through holes I and II. The outer oil pipe is bolted to the female connector via the threaded blind hole II and the threaded through hole II. The outer oil pipe is bolted to the male connector via the threaded blind hole I and the threaded through hole I. The inner tubing consists of a sliding... The system comprises a sliding guide groove, a limiting point, a mating socket, a support platform, threaded section II, and threaded section III. The hub moves along the sliding guide groove to the limiting point, where it is plugged into a wet electrical plug. Threaded section II mates with threaded section IV, and threaded section III mates with threaded section I. The female connector comprises a conical sealing pair II, a threaded section, and a threaded blind hole II. The conical sealing pair II mates with the conical sealing pair of the power tool. The inner tube column is threaded to the female connector via threaded section IV and threaded section II, while the female connector is bolted to the outer oil pipe via threaded blind hole II and threaded through hole II.

[0012] The visualization monitoring module consists of a protective cover, a right-angle camera, a wide-angle camera, a base, and a fixing buckle. The fixing buckle cooperates with the fixing slot of the docking guide mechanism to fix the visualization monitoring module on the docking guide mechanism.

[0013] The docking guide mechanism consists of a fixed slot, cable holes evenly distributed along the circumference, threaded through holes III, a front guide cylinder, and a spring wheel-type limiting component. The spring wheel-type limiting component is located inside the front guide cylinder and is fixedly welded to the wall of the docking guide mechanism via a cylindrical section II. The spring wheel-type limiting component consists of a hub, a cylindrical section I, a spring section, and a cylindrical section II. The hub is fitted onto one end of the cylindrical section I to ensure that the hub can roll circumferentially. The cylindrical section I is welded to the spring section, the spring section is welded to the cylindrical section II, and the cylindrical section II is welded to the wall of the docking guide mechanism.

[0014] The electric drive screw actuator consists of a motor, a connecting shaft, wedge blocks arranged on the upper and lower sections of the central shaft, and the central shaft itself. The motor is located inside the docking guide mechanism and is connected to the connecting shaft via a coupling. The connecting shaft is connected to the central shaft via a thread. Eight wedge blocks are evenly distributed around the circumference and welded to the upper and lower sections of the central shaft, with four blocks in each section. The central shaft moves up and down after being driven by the motor, causing the wedge blocks to engage with the passive wedge blocks, which in turn drives the wedge radial expansion mechanism to expand or contract. This further enables the detachable battery compartment to lock and grip the downhole depleted battery and accurately insert and install the fully charged battery.

[0015] The wedge-shaped radial expansion mechanism consists of an L-shaped claw, a passive wedge block, a limiting shell, a threaded through hole IV, and a spring buckle. The passive wedge block is bolted to the limiting shell through the threaded through hole IV. Two passive wedge blocks are provided on each wedge-shaped radial expansion mechanism. The spring buckle is welded to the outside of the limiting shell. The L-shaped claw at the upper end of the limiting shell is engaged with the lug on the connecting frame. The passive wedge block is slidably connected to the wedge block.

[0016] The removable battery compartment consists of a spring snap-fit ​​groove, a battery compartment, and a wet electrical plug: the spring snap-fit ​​groove is opened on the inside of the removable battery compartment and is locked to the spring snap-fit; the wet electrical plug is welded to the outside of the removable battery compartment and is matched with the mating socket on the inner tube column.

[0017] The connecting frame consists of a through hole I, a threaded through hole V, a threaded blind hole III, a lug, a supporting column, and a through hole II. The connecting frame is connected to the docking guide mechanism via the threaded through hole V using bolts and nuts. The motor is fixed to the connecting frame via the threaded blind hole III using bolts. The connecting shaft passes through the through hole I and is threaded to the central shaft. The lug engages with the L-shaped claw.

[0018] The hub of the spring wheel-type limiting component can slide along the sliding guide groove of the inner tubing and eventually fall into the limiting position to achieve preliminary mechanical positioning; in conjunction with the monitoring of the visual monitoring module, a double guarantee is formed to achieve high-precision downhole positioning.

[0019] The wedge-shaped radial expansion mechanism and the detachable battery compartment are both equidistantly arranged along the circumference. There are eight wedge-shaped blocks on the central axis, which are respectively arranged at the upper and lower parts of the central axis to achieve uniform force distribution.

[0020] The bottom of the connecting frame is provided with several through holes evenly distributed along the circumference, so that the downhole gas can rise normally during the lowering of the device without affecting the normal operation of the well.

[0021] The aforementioned automatic battery replacement device for downhole electrical control tools that do not require tubing string replacement is characterized by the following steps in its specific engineering implementation:

[0022] S1: Initial system deployment and first installation of a fully charged battery, specifically including the following steps:

[0023] S11: A removable battery compartment with a fully charged battery is pre-installed on the support platform of the inner tube column, so that its wet electrical plug is connected to the mating socket.

[0024] S12: The pre-installed battery compartment section of the tool is used as a section of the production string and connected to the upper production string. It is then lowered into the well to the predetermined depth along with the production string to complete cementing or setting operations, making it a fixed component of the downhole production string. At this point, the downhole power tool has obtained initial power and begins operation.

[0025] S2: Remove the depleted battery from the well, which includes the following steps:

[0026] S21: When the battery of the downhole power tool is depleted, the unloaded battery replacement tool is lowered downhole via the armored cable retraction module.

[0027] S22: When the battery replacement tool is lowered to the short section of the tool's battery compartment, its docking guide mechanism cooperates with the guide groove of the inner tube column to achieve initial mechanical positioning; at the same time, the image is transmitted to the remote monitoring module through the visual monitoring module, and the operator confirms that the tool has accurately reached the battery replacement station.

[0028] S23: The remote monitoring module starts the electric drive screw actuator, drives the central shaft to move down, and pushes the wedge radial expansion mechanism to expand radially through the wedge block, so that its spring buckle is inserted into the spring buckle groove (1101) of the downhole depleted detachable battery compartment to complete the gripping.

[0029] S24: The motor reverses, driving the central shaft to lift, and the wedge-shaped radial expansion mechanism contracts, unlocking and lifting the depleted removable battery compartment and its internal battery from the support platform.

[0030] S25: The battery replacement tool, along with the grabbed depleted and removable battery compartment, is lifted to the ground via the armored cable retraction module. This completes the recovery of the depleted battery.

[0031] S3: Install a fully charged battery, specifically including the following steps:

[0032] S31: On the ground, remove the depleted removable battery compartment from the battery replacement tool and install a removable battery compartment with a new fully charged battery into the tool's battery compartment.

[0033] S32: The battery replacement tool, loaded with a new fully charged battery, is lowered back down to the same tool battery compartment section position in the well, and its precise positioning is achieved through a guidance and visualization system.

[0034] S33: The remote monitoring module controls the electric drive screw actuator to move, drive the central shaft to move down, press down on the new removable battery compartment and push it outward, so that its wet electrical plug can be accurately inserted into the docking port and finally sit stably on the support platform, completing the mechanical fixation and electrical connection.

[0035] S34: The electrically driven lead screw actuator resets, the wedge-shaped radial expansion mechanism retracts, and disengages from the newly installed and removable battery compartment.

[0036] S35: Lift the unloaded battery replacement tool to the surface. At this point, the downhole power tools are powered back and can continue working, completing a full battery replacement cycle.

[0037] Normal production processes do not need to be interrupted during the entire second and third phases of maintenance.

[0038] The beneficial effects of this invention are:

[0039] 1. To address the challenges of production interruptions and wellbore fluid flow disruptions caused by the need to raise and lower tubing for battery replacement, this invention utilizes a variable-diameter design in the tool battery compartment section to divide the battery mounting area into a tool passage area. Simultaneously, through-holes are created in the connecting frame to ensure normal wellbore fluid flow. This allows for battery replacement operations without raising or lowering tubing, ensuring uninterrupted wellbore production and significantly reducing operating costs and time.

[0040] 2. To address the shortcomings of insufficient stability and accuracy in downhole positioning, poor battery insertion alignment accuracy, and poor vibration resistance, a dual-protection positioning scheme is adopted, which combines mechanical positioning with sliding grooves and limiting points with monitoring by a visual monitoring module. This scheme is optimized in conjunction with a high-precision alignment structure and a strong vibration-resistant design to achieve accurate positioning, improve the stability and accuracy of the positioning system, resolve potential electrical contact problems, and ensure reliable power transmission under vibration conditions.

[0041] 3. In order to adapt to the complex working conditions of high pressure and high temperature in deep wells, the present invention adopts a wedge-type expansion mechanism design to enhance the reliability of the action, avoid the risk of action failure from the structural level, ensure that the device continues to operate stably under harsh conditions, and build a solid safety line for operation.

[0042] 4. To address the issues of cumbersome disassembly and maintenance and poor adaptability of the device, this invention adopts a highly modular design, in which each functional unit can be independently disassembled and replaced, significantly improving the device's ease of maintenance, rapid adaptability to different working conditions, and overall reusability. Attached Figure Description

[0043] Figure 1 This is an external view of the present invention;

[0044] Figure 2 This is a schematic diagram of the male connector structure of the present invention;

[0045] Figure 3 This is a schematic diagram of the external oil pipe structure of the present invention;

[0046] Figure 4 This is a schematic diagram of the internal tubular column structure of the present invention;

[0047] Figure 5 This is a schematic diagram of the female connector structure of the present invention;

[0048] Figure 6 This is a schematic diagram of the structure of the visualization monitoring module of the present invention;

[0049] Figure 7 This is a schematic diagram of the docking guide mechanism of the present invention;

[0050] Figure 8 This is a schematic diagram of the structure of the electrically driven lead screw actuator of the present invention;

[0051] Figure 9 This is a schematic diagram of the wedge-shaped radial expansion mechanism of the present invention;

[0052] Figure 10 This is a schematic diagram of the detachable battery compartment structure of the present invention;

[0053] Figure 11 This is a schematic diagram of the connection frame structure of the present invention;

[0054] Figure 12 This is a schematic diagram of the counterweight section of the tool of the present invention;

[0055] Figure 13 This is a process flow diagram of the present invention.

[0056] In the diagram, 1-Remote monitoring module, 2-Armored cable take-up and unwinding module, 3-Male connector, 301-Threaded section I, 302-Threaded blind hole I, 303-Conical sealing pair I, 4-Outer oil pipe, 401-Threaded through hole I, 402-Electric wire sleeve, 403-Threaded through hole II, 5-Inner tube column, 501-Sliding guide groove, 502-Limit point, 503-Mating socket, 504-Support platform, 505-Threaded section II, 506-Threaded section III, 6-Female connector, 601-Conical sealing pair II, 602-Threaded section IV, 603-Threaded blind hole II, 7-Visual monitoring module, 701-Protective cover, 702-Right-angle camera, 703-Wide-angle camera, 704-Base, 705-Fixing buckle, 8-Mating guide mechanism, 801-Fixing slot, 802-Cable passage hole, 803-Threaded through hole III 804-Front-end guide cylinder, 805-Spring wheel type limit component, 805a-Hub, 805b-Cylindrical section I, 805c-Spring section, 805d-Cylindrical section II, 9-Electric drive screw actuator, 901-Motor, 902-Connecting shaft, 903-Wedge block, 904-Central shaft, 10-Wedge radial expansion mechanism, 1001-L-shaped claw, 1002-Passive wedge block, 1003-Limit outer... 1004 - Threaded through hole IV, 1005 - Spring snap fastener, 11 - Removable battery compartment, 1101 - Spring snap fastener slot, 1102 - Battery compartment, 1103 - Wet electrical plug, 12 - Connecting frame, 1201 - Through hole I, 1202 - Threaded through hole V, 1203 - Threaded blind hole III, 1204 - Lug, 1205 - Support column, 1206 - Through hole II, 13 - Tool counterweight section. Detailed Implementation

[0057] The present invention will be further described below with reference to the accompanying drawings. The scope of protection of the present invention is not limited to the following description:

[0058] like Figures 1-13 As shown, an automatic battery replacement device for downhole electrically controlled tools that do not require tubing is comprising a tool battery compartment sub, a remote monitoring module 1, an armored cable retraction module 2, a visual monitoring module 7, a docking guide mechanism 8, an electrically driven lead screw actuator 9, a wedge-shaped radial expansion mechanism 10, a detachable battery compartment 11, a connecting frame 12, and a tool counterweight sub 13. Its features include:

[0059] The tool battery compartment section consists of a male connector 3, an outer oil pipe 4, an inner tube column 5, and a female connector 6. The male connector 3 comprises a threaded section I 301, a threaded blind hole I 302, and a conical sealing pair I 303. The threaded section I 301 mates with the threaded section III 506. The male connector 3 and the outer oil pipe 4 are bolted together via the threaded blind hole I 302 and the threaded through hole I 401. The male connector 3 is connected to the upper oil pipe via the conical sealing pair I 303. The outer oil pipe 4 has a threaded through hole I 401, an electrical conduit 402, and a threaded through hole II 403. The outer oil pipe 4 and the female connector 6 are bolted together via the threaded blind hole II 603 and the threaded through hole II 403. The outer oil pipe 4 and the male connector 3 are connected via the threaded blind hole I 302 and the threaded through hole I 403. 401 is bolted together; the inner tube column 5 is composed of a sliding guide groove 501, a limiting point 502, a mating socket 503, a support platform 504, threaded section II 505, and threaded section III 506; the hub 805a moves along the sliding guide groove 501 to the limiting point 502, the mating socket 503 is plugged into the wet electrical plug 1103, threaded section II 505 is mated with threaded section IV 602, and threaded section III 506 is mated with threaded section I 301; the female connector 6 is composed of a conical sealing pair II 601, threaded section IV 602, and threaded blind hole II 603; the conical sealing pair II 601 is mated with the conical sealing pair of the power tool, the inner tube column 5 and the female connector 6 are threaded together through threaded section IV 602 and threaded section II 505, and the female connector 6 and the outer oil pipe 4 are bolted together through threaded blind hole II 603 and threaded through hole II 403;

[0060] The visualization monitoring module 7 consists of a protective cover 701, a right-angle camera 702, a wide-angle camera 703, a base 704, and a fixing buckle 705. The fixing buckle 705 cooperates with the fixing slot 801 of the docking guide mechanism 8 to fix the visualization monitoring module 7 on the docking guide mechanism 8.

[0061] The docking guide mechanism 8 consists of a fixed slot 801, cable holes 802 evenly distributed along the circumference, threaded through holes III 803, a front guide cylinder 804, and a spring wheel-type limiting component 805. The spring wheel-type limiting component 805 is located inside the front guide cylinder 804 and is fixedly welded to the wall of the docking guide mechanism 8 via a cylindrical section II 805d. The spring wheel-type limiting component 805 consists of a hub 805a, a cylindrical section I 805b, a spring section 805c, and a cylindrical section II 805d. The hub 805a is fitted onto one end of the cylindrical section I 805b to ensure that the hub 805a can roll circumferentially. The cylindrical section I 805b is welded to the spring section 805c, the spring section 805c is welded to the cylindrical section II 805d, and the cylindrical section II 805d is welded to the wall of the docking guide mechanism 8.

[0062] The electrically driven lead screw actuator 9 consists of a motor 901, a connecting shaft 902, wedge blocks 903 arranged on the upper and lower sections of the central shaft 904, and the central shaft 904. The motor 901 is located inside the docking guide mechanism 8 and is connected to the connecting shaft 902 via a coupling. The connecting shaft 902 is connected to the central shaft 904 via a thread. Eight wedge blocks 903 are evenly distributed around the circumference and welded to the upper and lower sections of the central shaft 904, with four distributed in each section. After being driven by the motor 901, the central shaft 904 moves up and down, causing the wedge blocks 903 to engage with the passive wedge blocks 1002, thereby driving the wedge radial expansion mechanism 10 to expand or contract. This further enables the detachable battery compartment 11 to lock and grip the downhole depleted battery and accurately insert and install the fully charged battery.

[0063] The wedge-shaped radial expansion mechanism 10 consists of an L-shaped claw 1001, a passive wedge block 1002, a limiting shell 1003, a threaded through hole IV 1004, and a spring buckle 1005. The passive wedge block 1002 and the limiting shell 1003 are bolted together through the threaded through hole IV 1004. Two passive wedge blocks 1002 are provided on each wedge-shaped radial expansion mechanism 10. The spring buckle 1005 is welded to the outside of the limiting shell 1003. The L-shaped claw 1001 at the upper end of the limiting shell 1003 is connected to the lug 1204 on the connecting frame 12. The passive wedge block 1002 is slidably connected to the wedge block 903.

[0064] The removable battery compartment 11 consists of a spring snap groove 1101, a battery compartment 1102, and a wet electrical plug 1103: the spring snap groove 1101 is opened on the inner side of the removable battery compartment 11 and is locked to the spring snap 1005; the wet electrical plug 1103 is welded to the outer side of the removable battery compartment 11 and cooperates with the mating socket 503 on the inner tube column 5.

[0065] The connecting frame 12 is composed of a through hole I 1201, a threaded through hole V 1202, a threaded blind hole III 1203, a hanging lug 1204, a supporting column 1205, and a through hole II 1206. The connecting frame 12 is bolted and nut connected to the docking guide mechanism 8 through the threaded through hole V 1202. The motor 901 is bolted and fixed to the connecting frame 12 through the threaded blind hole III 1203. The connecting shaft 902 passes through the through hole I 1201 and is threaded to the central shaft 904. The hanging lug 1204 cooperates with the L-shaped claw 1001.

[0066] The hub of the spring wheel-type limiting component can slide along the sliding guide groove 501 of the inner tubing 5 and eventually fall into the limiting position 502 to achieve preliminary mechanical positioning; then, in conjunction with the monitoring of the visual monitoring module 7, it is verified to form a double guarantee, thereby achieving high-precision downhole positioning.

[0067] The wedge-shaped radial expansion mechanism 10 and the detachable battery compartment 11 are both arranged at equal intervals along the circumference. There are eight wedge-shaped blocks 903 on the central shaft 904, which are respectively arranged at the upper and lower parts of the central shaft 904 to achieve uniform force distribution.

[0068] The bottom of the connecting frame 12 is provided with several through holes II 1206 evenly distributed in the circumferential direction, so that the downhole gas can rise normally during the device lowering process without affecting the normal operation of the well.

[0069] In the specific implementation of the project, it includes the following steps:

[0070] S1: Initial system deployment and first installation of a fully charged battery, specifically including the following steps:

[0071] S11: A removable battery compartment 11 with a fully charged battery is pre-installed on the support platform 504 of the inner tube column 5, so that its wet electrical plug 1103 is connected to the docking socket 503.

[0072] S12: The pre-installed battery compartment section of the tool is used as a section of the production string and connected to the upper production string. It is then lowered into the well to the predetermined depth along with the production string to complete cementing or setting operations, making it a fixed component of the downhole production string. At this point, the downhole power tool has obtained initial power and begins operation.

[0073] S2: Remove the depleted battery from the well, which includes the following steps:

[0074] S21: When the battery of the downhole power tool is depleted, the unloaded battery replacement tool is lowered downhole through the armored cable retraction module 2.

[0075] S22: When the battery replacement tool is lowered to the short section of the tool's battery compartment, its docking guide mechanism 8 cooperates with the guide groove of the inner tube column 5 to achieve initial mechanical positioning; at the same time, the image is transmitted to the remote monitoring module 1 through the visual monitoring module 7, and the operator confirms that the tool has accurately reached the battery replacement station.

[0076] S23: The remote monitoring module 1 starts the electric drive screw actuator 9, drives the central shaft 904 to move down, and pushes the wedge radial expansion mechanism 10 to expand radially through the wedge block 903, so that its spring buckle 1005 is inserted into the spring buckle groove 1101 of the downhole depleted removable battery compartment to complete the gripping.

[0077] S24: Motor 901 reverses, driving the central shaft 904 to lift, and the wedge-shaped radial expansion mechanism 10 retracts, unlocking and lifting the depleted removable battery compartment and its internal battery from the support platform 504.

[0078] S25: The battery replacement tool, along with the grabbed depleted removable battery compartment, is lifted to the ground via the armored cable retraction module 2. This completes the recovery of the depleted battery.

[0079] S3: Install a fully charged battery, specifically including the following steps:

[0080] S31: On the ground, remove the depleted removable battery compartment from the battery replacement tool and install a removable battery compartment 11 with a new fully charged battery into the tool's battery compartment 1102.

[0081] S32: The battery replacement tool, loaded with a new fully charged battery, is lowered back down to the same tool battery compartment section position in the well, and its precise positioning is achieved through a guidance and visualization system.

[0082] S33: The remote monitoring module 1 controls the electric drive screw actuator 9 to move, drive the central shaft 904 to move down, press down on the new detachable battery compartment 11 and push it outward, so that its wet electrical plug 1103 is accurately inserted into the docking socket 503 and finally sits stably on the support platform 504, completing the mechanical fixation and electrical connection.

[0083] S34: The electrically driven lead screw actuator 9 resets, the wedge-shaped radial expansion mechanism 10 retracts, and disengages from the new removable battery compartment that has been installed in place.

[0084] S35: Lift the unloaded battery replacement tool to the surface. At this point, the downhole power tools are powered back and can continue working, completing a full battery replacement cycle.

[0085] Normal production processes do not need to be interrupted during the entire second and third phases of maintenance.

[0086] Obviously, the described embodiments are only some, not all, of the embodiments of the present invention. All other embodiments obtained by those skilled in the art based on the embodiments of the present invention without inventive effort are within the scope of protection of the present invention.

[0087] In the description of this invention, it should be noted that the directions or positional relationships indicated by terms such as "center," "upper," "lower," "left," "right," "vertical," "horizontal," "inner," and "outer" are based on the directions or positional relationships shown in the accompanying drawings and are only for the convenience of describing this invention and simplifying the description, and do 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, and therefore should not be construed as a limitation of this invention. Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance.

[0088] In the description of this invention, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "joining" should be interpreted broadly. For example, they can refer to fixed connections, detachable connections, or integral connections; they can refer to mechanical connections or electrical connections; they can refer to direct connections or indirect connections through an intermediate medium; and they can refer to the internal communication between two components. Those skilled in the art can understand the specific meaning of the above terms in this invention based on the specific circumstances.

[0089] Furthermore, the technical features involved in the different embodiments of the present invention described below can be combined with each other as long as they do not conflict with each other.

[0090] Obviously, the above embodiments are merely illustrative examples for clear explanation and are not intended to limit the implementation. Those skilled in the art can make other variations or modifications based on the above description. It is neither necessary nor possible to exhaustively list all possible implementations. However, obvious variations or modifications derived therefrom are still within the scope of protection of this invention.

Claims

1. An automatic battery replacement device for downhole electrical control tools that do not require tubing, comprising a battery compartment section for permanent downhole infrastructure tools and a run-in battery replacement tool, characterized in that: The tool battery compartment section consists of a male connector (3), an outer oil pipe (4), an inner tube column (5), and a female connector (6). The outer oil pipe (4) and the inner tube column (5) are coaxially mounted. The inner tube column (5) is a reducing pipe, with the upper and lower sections being standard diameter sections and the middle section being an enlarged section. The inner wall of the standard diameter section is provided with a sliding guide groove (501), and the enlarged section is provided with a limiting point (502), a docking port (503), and a support platform (504). The battery replacement tool includes a remote monitoring module (1), an armored cable retraction module (2), a visual monitoring module (7), a docking guide mechanism (8), an electric drive screw actuator (9), a wedge-shaped radial expansion mechanism (10), a removable battery compartment (11), a connecting frame (12), and a tool counterweight section (13). The remote monitoring module (1) is connected to the armored cable retraction module (2). The armored cable branches into multiple sets of connectors, one set for suspending the tool, and another set for connecting to the motor of the electric drive screw actuator (9). 901), another set of connected visual monitoring modules (7); the visual monitoring module (7) is installed on the docking guide mechanism (8) by a fixing buckle (705); the docking guide mechanism (8) has a radially elastic spring wheel-type limiting part (805) at the front end, whose hub (805a) cooperates with the sliding guide groove (501) to slide and finally snap into the limiting position (502); the electric drive screw actuator (9) consists of a motor (901), a connecting shaft (902), a central shaft (904) that can move up and down and The structure consists of a wedge block (903); the wedge-shaped radial expansion mechanism (10) includes an L-shaped claw (1001), a passive wedge block (1002), a limiting shell (1003), and a spring buckle (1005). The passive wedge block (1002) is slidably connected to the wedge block (903), and the L-shaped claw (1001) is engaged with the lug (1204) of the connecting frame (12). The detachable battery compartment (11) is detachably connected to the wedge-shaped radial expansion mechanism (10), including a spring buckle groove (1101), a battery compartment ( 1102) and wet electrical plug (1103); when the battery replacement tool is lowered into the short section of the tool battery compartment, the mechanical initial positioning is achieved by the spring wheel type limit member (805) and the limit point (502), the motor (901) drives the central shaft (904) to move, and controls the wedge radial expansion mechanism (10) to grab or release the detachable battery compartment (11), so that the wet electrical plug (1103) is plugged into the docking socket (503), and the detachable battery compartment (11) finally sits on the support platform (504).

2. The automatic battery replacement device for downhole electrical control tools that do not require tubing removal, as described in claim 1, is characterized in that: The spring wheel-type limiting component (805) can slide along the sliding guide groove (501) of the inner tubing (5) and finally fall at the limiting position (502) to realize the automatic mechanical positioning of the device downhole. It works in conjunction with the visualization monitoring module (7) installed on the docking guide mechanism (8) to perform real-time observation and position verification. The two work together to form a dual guarantee for positioning and improve the positioning accuracy of the device in downhole operations.

3. The automatic battery replacement device for downhole electrical control tools that do not require tubing removal, as described in claim 1, is characterized in that: The wedge-shaped radial expansion mechanism (10) and the detachable battery compartment (11) are both arranged at equal intervals along the circumference; the wedge blocks (903) are respectively arranged at the upper and lower sections of the central axis (904) to achieve uniform force distribution.

4. The automatic battery replacement device for downhole electrical control tools that do not require tubing removal, as described in claim 1, is characterized in that: The connecting frame (12) is provided with several through holes evenly distributed along the circumference, so that the downhole gas can rise normally during the device lowering process without affecting the normal operation of the wellbore; the tool counterweight section (13) is installed and fixed at the lower end of the device and connected to the connecting frame (12) to increase the overall weight of the device, overcome the resistance of the downhole fluid and the lifting force of the cable, and ensure that the device can reach the battery replacement operation position smoothly and accurately.

5. The automatic battery replacement device for downhole electrical control tools that do not require tubing removal, as described in claim 1, is characterized in that: The specific engineering implementation includes the following steps: S1: Initial system deployment and first installation of a fully charged battery, specifically including the following steps: S11: A removable battery compartment (11) with a fully charged battery is pre-installed on the support platform (504) of the inner tube column (5) so that its wet electrical plug (1103) is connected to the docking port (503). S12: The pre-installed battery compartment section of the tool is used as a section of the production string and connected to the upper production string. It is then lowered into the well to a predetermined depth along with the production string to complete cementing or setting operations, making it a fixed component of the downhole production string. At this point, the downhole power tool has obtained initial power and begins to work. S2: Remove the depleted battery from the well, which includes the following steps: S21: When the battery power of the downhole power tool is depleted, the unloaded battery replacement tool is lowered down into the well through the armored cable take-up and down module (2); S22: When the battery replacement tool is lowered to the short section of the battery compartment of the tool, its docking guide mechanism (8) cooperates with the guide groove of the inner tube column (5) to achieve initial mechanical positioning; at the same time, the image is transmitted to the remote monitoring module (1) through the visualization monitoring module (7), and the operator confirms that the tool has accurately reached the battery replacement station; S23: The remote monitoring module (1) starts the electric drive screw actuator (9), drives the central shaft (904) to move down, and pushes the wedge radial expansion mechanism (10) to expand radially through the wedge block (903), so that its spring buckle (1005) is inserted into the spring buckle groove (1101) of the downhole depleted detachable battery compartment to complete the gripping; S24: The motor (901) reverses, drives the central shaft (904) to lift, and the wedge-shaped radial expansion mechanism (10) contracts, unlocking and lifting the depleted removable battery compartment and its internal battery from the support platform (504); S25: The battery replacement tool, along with the grabbed depleted removable battery compartment, is lifted to the ground via the armored cable retraction module (2). This completes the recovery of the depleted battery. S3: Install a fully charged battery, specifically including the following steps: S31: On the ground, remove the depleted removable battery compartment from the battery replacement tool and install a removable battery compartment (11) with a new fully charged battery installed into the tool's battery compartment (1102); S32: The battery replacement tool, loaded with a new fully charged battery, is lowered back down to the same tool battery compartment section position in the well, and precise positioning is achieved through the guidance and visualization system; S33: The remote monitoring module (1) controls the electric drive screw actuator (9) to move, drive the central shaft (904) to move down, press down the new detachable battery compartment (11) and push it outward, so that its wet electrical plug (1103) is accurately inserted into the docking socket (503) and finally sits stably on the support platform (504) to complete the mechanical fixation and electrical connection; S34: The electric drive screw actuator (9) resets, the wedge radial expansion mechanism (10) retracts, and disengages from the new removable battery compartment that has been installed in place; S35: Lift the unloaded battery replacement tool to the surface. At this point, the downhole power tools are powered back and can continue working; the system has completed a full battery replacement cycle. Normal production processes do not need to be interrupted during the entire second and third phases of maintenance.

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