Underground intelligent righting and fixing method for deep well pump water lifting pipe back installation process

Abstract

The application discloses a downhole intelligent righting and fixing method for a deep-well pump water-lifting pipe during a reinstallation process, and relates to the technical field of deep-well pump equipment installation and maintenance. The method comprises the following steps: a plurality of groups of fixing claws are pre-installed on the outer wall of a single pipe body, and a plurality of source distance measuring sensors are arranged downhole; when being lowered, the sensors collect distance data of the pipe column and the well wall in real time; an AI analysis module combines with lowering depth data to construct a three-dimensional space posture model of the pipe column, and solves the central offset and axial bending degree in real time; when there is a collision risk or deformation, the AI module outputs a control instruction to control the differential extension of the fixing claws in the corresponding direction, flexibly abuts against the well wall, actively corrects the center of the pipe body and corrects the bending. The application extends the fixed constraint to the downhole for the first time, realizes the follow-up closed-loop adaptive righting of the pipeline, the collision early warning accuracy is more than 98%, the overall bending degree is controlled within 0.5‰, and the anticorrosion layer damage and flange sealing failure are completely avoided.

Description

Technical Field

[0001] This invention relates to the field of deep well pump equipment installation and maintenance technology, specifically to a method for intelligent downhole straightening and fixing during the reinstallation of the deep well pump's delivery pipe. Background Technology

[0002] The statements in this section are provided only as background information in connection with this disclosure and may not constitute prior art.

[0003] Deep well pumps are widely used in groundwater extraction, mine drainage, and water conveyance from sump wells. Their delivery pipes typically consist of multiple sections of single pipe joined together by flanges to form a long string, sometimes tens or even hundreds of meters in length, which is then lowered section by section into the wellbore. Because the gap between the wellbore diameter and the delivery pipe's outer diameter is extremely small, the delivery pipe string is highly susceptible to irreversible bending deformation due to its immense weight during long-distance lowering and reinstallation. Simultaneously, the swaying of the hoisting wire rope and the impact of the water flow underground can cause the pipe section to sway circumferentially, leading to frequent impacts with the wellbore wall. This can cause severe damage to the pipe's anti-corrosion coating, failure of the flange connection gaskets due to uneven loading, and in severe cases, even catastrophic engineering risks such as scraping against the well wall, causing debris to fall, jamming, or wellbore collapse.

[0004] Existing technical solutions have significant shortcomings regarding the fixing and positioning of water delivery pipes during installation: 1. Fixed position limited to the wellhead, lacking downhole straightening capability: Most existing fixing devices are only installed on the wellhead platform, providing only temporary support and restraint at the wellhead. They offer no lateral restraint on long suspended pipe sections tens of meters downhole, failing to address the core issues of bending due to the pipe's own weight and swaying and impact with the well wall from a fundamental mechanical perspective.

[0005] 2. Highly dependent on manual experience for control, with no active collision avoidance warning: The existing installation process relies solely on the visual observation and experience of the hoisting personnel to control the lowering speed and pipe posture. It is impossible to obtain the circumferential distance of the pipe in the dark environment of the deep well in real time. Before a collision occurs, it is in a "blind flight" state, with high operational risks and extremely poor accuracy.

[0006] 3. Lack of quantitative attitude control logic and multi-scenario adaptability: Existing technologies lack quantitative correction methods for "intermediate pipe deflection", relying solely on the natural descent of the pipe by its own weight; moreover, existing clamps have limited functions and cannot simultaneously meet the needs of two completely different engineering scenarios: "recycling after temporary maintenance" and "permanent retention as pipeline vibration reduction support in new projects".

[0007] Given the serious shortcomings of the existing technologies, there is an urgent need to develop a method for fixing and reinstalling water delivery pipes that can be directly applied to deep underground pipe sections, can monitor three-dimensional attitude in real time, has active straightening and anti-swaying capabilities, and can be flexibly adapted to various engineering scenarios. Summary of the Invention

[0008] The purpose of this invention is to address the technical shortcomings of current deep well pump riser pipes, which rely solely on static fixation at the wellhead during long-distance lowering, leading to bending deformation and swaying due to their own weight, impacting the well wall, and heavily relying on manual experience with a lack of active anti-collision control measures. This invention provides an intelligent downhole straightening and fixing method for the reinstallation of deep well pump riser pipes. It employs multiple sets of fixing claws with retractable arms pre-installed on the outer wall of the pipe body, and distributes multi-source ranging sensors throughout the pipe body downhole. Combined with a wellhead intelligent monitoring platform and AI analysis module, it calculates the three-dimensional spatial attitude of the pipe string in real time. Based on a closed-loop adaptive control algorithm of "gradual progression" and "three-point bending reverse loading," it outputs control commands to control the claw arms in corresponding directions to extend differentially and abut against the well wall. This achieves real-time accurate monitoring of the attitude of long downhole pipe sections and active anti-sway correction, effectively avoiding bending deformation and impacting the well wall during the lowering process, completely eliminating the risk of flange seal failure and anti-corrosion layer damage, and simultaneously adapting to both temporary reinstallation and non-destructive recovery and permanent retention with active vibration reduction engineering scenarios.

[0009] The technical solution of the present invention is as follows: A method for intelligent downhole straightening and fixing during the reinstallation of a deep well pump delivery pipe includes: Step S1: Pre-installing fixing claws: Multiple sets of fixing claws are pre-installed along the axial direction on the outer wall of each single pipe section. Each set of fixing claws includes multiple telescopic claw arms that are evenly distributed along the circumference of the single pipe. The ends of the telescopic claw arms are provided with contacts. All fixing claws are communicatively connected to the main control unit in the intelligent monitoring platform deployed at the wellhead. Step S2: Deploy the intelligent monitoring platform at the wellhead: Build the intelligent monitoring platform at the wellhead. The intelligent monitoring platform integrates the main control unit and the AI ​​analysis module. Multiple sets of ranging sensors are distributed at the lower end of the first single pipe section and along the pipe body. The ranging sensors are communicatively connected to the main control unit. Step S3: Sectional Lowering and Real-time Attitude Monitoring: The single pipe sections are connected one by one to form a water delivery pipe string and lowered into the well. During the lowering process, the distance sensor collects the distance data between the water delivery pipe string and the well wall in each circumferential direction in real time. The AI ​​analysis module calculates the center offset, sway amplitude, and axial curvature of the water delivery pipe string in real time based on the distance data. When the distance data in a certain direction is less than the safety threshold, an early warning signal is triggered. Step S4: Adaptive straightening control: When the AI ​​analysis module detects that the center offset of the water delivery pipe string exceeds the standard, the swaying amplitude exceeds the standard, or there is a risk of collision, it outputs a control command to control the telescopic claw arm in the corresponding position to extend so that the contact point abuts against the well wall. By differentially adjusting the extension amount and pre-tightening force of each telescopic claw arm, the center position of the water delivery pipe string is actively corrected and the bending deformation is corrected, forming a multi-point straightening constraint, so that the entire pipeline and the axis of the well barrel remain coaxial. Step S5: Pipeline placement and device disposal: After all the single pipes are lowered and installed in place, control the retractable claw arm to retract and release the fixing claw from the water delivery pipe string, and retract the fixing claw; or keep the retractable claw arm in a tightened state, so that the fixing claw is permanently left in the wellbore as a long-term uprighting support.

[0010] Furthermore, the fixing claw is a magnetic fixing claw, which includes an electromagnetic chuck and a control cable; In step S1, the magnetic fixing claw is attached to the outer wall of the single tube by the electromagnetic chuck, and the control cable is laid along the outer wall of the single tube and connected to the main control unit of the intelligent monitoring platform for power supply and signal transmission. In step S5, when the retractable claw arm is retracted and the fixing claw is released from the water delivery pipe column, the specific operation is as follows: the electromagnetic chuck is de-energized and demagnetized, so that the magnetic fixing claw is lifted and retracted together with the hoisting equipment.

[0011] Furthermore, the fixing claw is a welded fixing claw, and the welded fixing claw has a built-in high-temperature energy storage battery and a wireless communication module; In step S1, the welding-type fixing claw is welded and fixed to the outer wall of the single pipe body, and communicates with the main control unit of the intelligent monitoring platform through the wireless communication module; In step S5, when the retractable claw arm is kept in a tightened state so that the fixed claw is permanently retained in the wellbore, the retractable claw arm is kept in a slightly tightened state as a long-term uprighting support for the water delivery pipe string.

[0012] Furthermore, in step S1, each section of the single tube is pre-installed with 2 to 4 sets of the fixing claws along the axial direction. Each set of the fixing claws includes 3 to 4 retractable claw arms that are evenly distributed along the circumference of the single tube, and the contact is a wear-resistant and non-slip contact.

[0013] Furthermore, in step S2, the ranging sensor includes a laser ranging sensor and a millimeter-wave radar; The lower end of the first section of the single pipe is also equipped with an explosion-proof camera. The explosion-proof camera is connected to the main control unit and is used to synchronously transmit video footage of the area surrounding the lowering of the water delivery pipe string in step 3.

[0014] Furthermore, in step S3, the specific process by which the AI ​​analysis module calculates the axial curvature of the water delivery pipe string is as follows: The AI ​​analysis module extracts multiple sets of real-time distance data collected by the ranging sensors and combines them with historical depth displacement data recorded during the descent of the water delivery pipe section by section to construct a three-dimensional spatial posture model of the water delivery pipe section within the wellbore. The actual central axis of the water delivery pipe string is fitted based on the three-dimensional spatial posture model, and the actual central axis is compared with the standard axis of the wellbore to calculate the axial curvature of the water delivery pipe string.

[0015] Furthermore, in step S3, the safety threshold is dynamically set based on the diameter of the wellbore and the material of the water delivery pipe string, and the minimum safety distance is not less than 20mm; When the axial curvature exceeds 1‰, the AI ​​analysis module determines that there is a collision risk and triggers the warning signal.

[0016] Furthermore, in step S4, when the AI ​​analysis module differentially adjusts the extension amount and preload of each of the retractable claw arms, it follows a graded and gradual principle, specifically including: When the warning signal is triggered in the early stage, the retractable claw arm in the corresponding position is extended until the contact approaches the well wall to form a limiting constraint. When the shaking amplitude of the riser pipe string is detected to increase, the preload of the telescopic claw arm is gradually increased to make the contact point press against the well wall, so as to avoid the riser pipe string from rebounding due to a sudden large thrust.

[0017] Furthermore, in step S4, when the AI ​​analysis module detects that the water supply pipe column has a mid-section bending deformation due to its own weight, the AI ​​analysis module outputs a control command to control the telescopic claw arm of the fixed claw in the middle section located on the convex side of the curved surface to increase the extension amount and the pre-tightening force, and correct it by differential tightening until the curvature of the entire pipeline is controlled within the target range.

[0018] Furthermore, in step S5, the specific operation of permanently retaining the fixing claw inside the wellbore as a long-term uprighting support includes: The retractable claw arm controlling all the fixed claws maintains a pre-tightening force of 0.5 kN within the wellbore; During the daily operation of the deep well pump, the fixed claw, which is in a dormant state, is periodically awakened to detect the pipeline posture, and the preload is dynamically fine-tuned according to the pipeline posture to suppress pipeline vibration during pump operation.

[0019] Compared with existing technologies, the advantages of this invention are: 1. For the first time, this invention achieves active straightening of downhole pipe sections, addressing the root causes of wall impact and bending problems through mechanical means. Breaking away from the limitations of traditional static constraints fixed only at the wellhead, this invention extends the straightening force point deep into the well. By using AI algorithms to identify the protruding side of the bend, a telescopic claw arm forms a multi-point collaborative constraint of "three-point bending reverse loading," stably controlling the overall bending degree of the entire pipe section within 0.5‰. During lowering, the pipe sway is reduced by more than 80%, completely avoiding corrosion damage and flange seal failure caused by collisions.

[0020] 2. The fusion of multi-source sensing and AI dynamic closed-loop control results in an exponential leap in alignment accuracy and safety. This invention abandons the "blind operation" of manual experience, innovatively integrating historical data from millimeter-wave radar, laser ranging, IMU inertial navigation, and depth encoders. This eliminates column rotation errors and reconstructs a high-precision 3D attitude model in virtual space. Combined with force feedback control from a micro pressure sensor at the end of the gripper arm, the operational accuracy is significantly improved from the traditional experience-based centimeter level to a definitive millimeter level, with a collision warning accuracy rate exceeding 98%.

[0021] 3. Dual-mode configuration design and long-term hibernation mechanism perfectly adapt to the needs of the entire life cycle operation. This solution offers two flexible configurations: magnetic and welded. During temporary maintenance, the magnetic configuration follows a safe "receive first, then detach" sequence to achieve lossless recycling and reuse; for permanent installation, the welded configuration maintains a precise pre-tightening force of 0.5kN during the long-term operation of the pump through an RTC ultra-low power wake-up and passive vibration interruption wake-up mechanism, successfully transforming the "construction straightener" during the reinstallation period into an "active vibration damper" during the operation and maintenance period, significantly extending the overall service life of the deep well pump system.

[0022] 4. Significantly improved work efficiency and greatly reduced risks associated with high-altitude and wellhead operations. The entire operation eliminates the need for repeated manual stops to adjust pipeline posture or check coaxiality. The system automatically completes millisecond-level alignment and correction loops during the uniform descent, increasing overall reassembly efficiency by over 40% and significantly shortening the construction cycle. Attached Figure Description

[0023] To more clearly illustrate the technical solutions in the embodiments of the present invention, the accompanying drawings used in the description of the embodiments will be briefly introduced below. Obviously, the accompanying drawings described below are only some embodiments recorded in the embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings.

[0024] Figure 1 This is a flowchart of an intelligent downhole straightening and fixing method for the reinstallation of a deep well pump riser pipe. Detailed Implementation

[0025] It should be noted that relational terms such as "first" and "second" are used merely to distinguish one entity or operation from another, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Furthermore, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such a process, method, article, or apparatus. Without further limitations, an element defined by the phrase "comprising one..." does not exclude the presence of other identical elements in the process, method, article, or apparatus that includes said element.

[0026] The features and performance of the present invention will be further described in detail below with reference to embodiments.

[0027] Example 1 In this embodiment, it should first be noted that, regarding the intelligent control and AI algorithm part, the "module", "unit" or "computation process" mentioned in this embodiment can all be implemented in engineering practice by equipping a conventional processor (such as PLC, DSP, industrial computer, etc.) and running the corresponding spatial geometric fitting algorithm and PID closed-loop control program. This is a deterministic physical control process that can be implemented by those skilled in the art based on existing computer programming technology.

[0028] Combination Figure 1 This embodiment provides a downhole intelligent straightening and fixing method for the reinstallation of a deep well pump's delivery pipe. Its core purpose is to address the technical shortcomings of existing technologies where long-distance delivery pipe strings of deep well pumps bend, sway, and collide with the well wall due to their own weight during lowering, and the lack of active downhole control. This method mainly consists of five interconnected stages: pre-installation, monitoring deployment, lowering monitoring, adaptive control, and device disposal. The specific engineering implementation process is as follows: 1. Pre-assembly stage of fixing claw The water supply pipe string is composed of multiple single pipe sections (usually about 6m long) joined together by flange assemblies. When bearing the weight of the long pipe string and lateral bending moment, the flange assemblies are prone to gasket failure due to excessive bending. Therefore, before lowering a single pipe section, multiple sets of fixing claws need to be pre-installed on its outer wall along the axial direction. Each set of fixing claws includes multiple retractable claw arms evenly distributed circumferentially, and the ends of the claw arms are equipped with wear-resistant and non-slip contacts made of polyurethane or hard rubber.

[0029] Depending on the specific engineering application scenario, the pre-installed fixing claw can be flexibly adopted in the following two specific configurations: (1) In temporary maintenance and reassembly scenarios (e.g., maintenance of a deep well pump for drainage in a mine, with a well diameter of 325mm, an outer diameter of 219mm for the water delivery pipe, and a total depth of 120m). Each pipe section is pre-installed with two sets of fixing claws, each set containing three claw arms evenly distributed at 120° circumferentially, with a maximum extension of 80mm. The bottom of the magnetic fixing claws is adsorbed onto the pipe wall by an electromagnetic chuck. Specifically, the telescopic drive cylinder is installed on the electromagnetic chuck base, and the side of the base is provided with a wired power supply and communication interface connected in series. Preferably, the surface of the electromagnetic chuck adsorption base has an inwardly concave arc surface structure that matches the outer diameter of the water delivery pipe, in order to maximize the contact area and prevent circumferential slippage during the descent vibration. At the same time, when the control cable is laid along the pipe, it is constrained section by section by a special strap or magnetic cable clip to prevent the cable from getting tangled and scratched in the well. The control cable is finally connected to the main control unit at the wellhead to achieve low-latency power supply and signal transmission.

[0030] (2) In the scenario of permanent installation in a newly built water collection well (e.g., well diameter 400mm, water delivery pipe outer diameter 273mm, total depth 80m). Each pipe section is pre-installed with 2 sets of fixing claws, each set containing 4 claw arms evenly distributed at 90° circumference. The welded fixing base at the bottom of the fixing claw is rigidly connected to the pipe wall through a weld, and the high-temperature resistant energy storage lithium battery and LoRa wireless communication module are integrated next to the telescopic drive cylinder inside. Preferably, a single charge of the high-temperature resistant energy storage lithium battery can meet the power supply requirements of the entire reinstallation operation, and the battery and wireless communication module are pre-paired for charging and communication before leaving the factory. After on-site welding, it can be powered on for testing without the need for cumbersome wellhead configuration.

[0031] 2. Deployment phase of the intelligent wellhead monitoring platform A working platform is built at the wellhead, integrating a main control unit, AI analysis module, display terminal, and winch control interface. Through the winch control interface, the main control unit can not only passively receive depth data but also directly control the wellhead winch to perform deceleration or emergency stop operations when extreme collision risks are detected. The display terminal provides real-time visualization of the three-dimensional attitude and human-machine interaction. To achieve comprehensive perception of the downhole environment, a downhole sensing component is integrated at the lower end of the first section of the casing. This component also includes a downward-facing axial millimeter-wave radar and an axial wear-resistant anti-slip contact at its lowest point. Multiple sets of lateral ranging sensors (including millimeter-wave radar and laser ranging sensors) are distributed throughout the subsequent casing. The lower end of the first section is also equipped with a downhole explosion-proof camera and a follow-up explosion-proof light. The follow-up explosion-proof light provides panoramic illumination in the dark environment of the deep well, simultaneously transmitting real-time clear video footage of the surrounding area during casing descent. Before the system is officially operational, all ranging sensors undergo initial zero-point calibration using the standard calibration ring at the wellhead to eliminate hardware installation errors and ensure the absolute accuracy of subsequent measurement benchmarks.

[0032] 3. Stage of segment-by-segment deployment and real-time attitude monitoring During operation, individual pipe sections are joined together to form a water delivery pipe string, which is then lowered at a set safe speed (e.g., 0.8 m / s) at a uniform rate. Distance sensors collect real-time distance data between the pipe string and the well wall in the circumferential direction (preferably at least three circumferentially distributed directions). Simultaneously, an axial millimeter-wave radar at the bottom detects the axial distance between the bottom of the pipe and the bottom of the well (or the deep well fluid surface) in real-time. Combined with a wear-resistant, anti-slip contact at the bottom, this system prevents end-point impact accidents when the pipe string is lowered to the bottom from both physical and algorithmic perspectives. During data acquisition, the main control unit employs a multi-source sensing fusion strategy: using high-penetration millimeter-wave radar data as the primary input for distance measurement in areas with high concentrations of water mist / dust downhole, and using high-precision laser distance measurement data for calibration and detail supplementation in clear environments. The two systems are redundant, ensuring uninterrupted data transmission even under harsh well conditions.

[0033] To overcome the challenge of single-section ranging not being able to determine the attitude of the entire pipe string, the AI ​​analysis module receives historical depth displacement data output by the encoder of the wellhead winch in real time. As the pipe is lowered, the AI ​​module stitches together the distance "slices" acquired by each sensor at different depths in a time series. To eliminate circumferential rotation errors caused by wire rope torque during the lowering of the long pipe string, a nine-axis IMU inertial measurement unit is also built into the lower end of the first pipe section for real-time acquisition of the pipe string's heading and roll angle data. After the AI ​​module performs spatial coordinate system rotation compensation and alignment on each layer of distance "slices" using this inertial angle data, it uses a spatial curve fitting algorithm to reconstruct an absolutely accurate three-dimensional spatial attitude model of the water delivery pipe string in virtual space. It then fits the actual center axis of the pipe string and calculates the center offset, sway amplitude, and axial curvature by comparing it with the standard axis of the wellbore.

[0034] The system dynamically sets safety thresholds based on pipe and well diameters (for example, in this embodiment, the default safety distance is not less than 20mm, and the actual warning value is set to 25mm). When the distance in any direction is less than the threshold, or the calculated axial curvature exceeds 1‰, it is determined that there is a risk of collision or flange failure, and a warning signal is triggered.

[0035] 4. Closed-loop adaptive positive control stage When an early warning is triggered, the system breaks the existing static constraints at the wellhead and performs active intervention deep downhole. The AI ​​analysis module outputs control commands to extend the retractable claw arm in the corresponding direction.

[0036] To ensure the stability and accuracy of the control, the control process follows the principle of "gradual progression": in the early warning stage, the claw arm extends until the contact point approaches the well wall to form a limit; if the shaking intensifies, the pre-tightening force is gradually increased to make the contact point flexibly press against the well wall. While ensuring the straightening effect, this avoids the tubing from rebounding due to instantaneous large thrust, and also avoids damage to the wellbore from excessive claw arm support.

[0037] Specifically, taking the tubing string lowered to a depth of 60m as an example: the system detects that the tubing has shifted westward, with the distance decreasing to 18mm. At this point, the western claw arm slowly extends to meet the limit, while simultaneously fine-tuning the extension of the claw arms in other directions. Ultimately, the center of the tubing is corrected back to the wellbore axis position, ensuring that the distance in each direction is stably maintained within the range of 50±5mm, and the sway amplitude is controlled within 5mm.

[0038] Furthermore, to address the mid-section deflection caused by the weight of the long tubing, this invention employs a mechanical correction principle similar to "three-point bending reverse loading." The AI ​​module identifies the convex side stagnation point on the curved surface in the 3D model, controls the adjacent fixed claws at the upper and lower ends to maintain basic limits, and instructs the middle fixed claw on the convex side to increase its extension and preload. To achieve precise quantitative control of the preload, a miniature pressure sensor (or motor current monitoring loop) is built into the drive end of the telescopic claw arm. The AI ​​module adjusts the thrust based on the force feedback closed loop, using differentiated clamping to "press" the tubing back to a straight state until the curvature of the entire tubing section is controlled within 0.3‰.

[0039] 5. Pipeline Installation and Equipment Handling Stage After all tubing columns have been lowered and installed in place: If it is a magnetic clamping claw, the system must follow the safety sequence of "retract first, then release": First, the main control unit issues a command to control the telescopic drive cylinder to fully retract the claw arm and release the lateral clamping force with the well wall; then, the electromagnetic chuck is de-energized and demagnetized to safely disconnect the clamping claw from the tubing string, and finally it is lifted and recycled together with the hoisting equipment for reuse. If a welded fixed claw is used, the claw arm is permanently left inside the wellbore as a long-term uprighting support. In this case, based on the aforementioned force feedback mechanism, all claw arms are controlled to maintain a precise pre-tightening force of 0.5kN. Since the welded fixed claw is located deep underground for extended periods and relies on an internal battery for power, to avoid power depletion due to real-time monitoring, its control unit integrates an RTC real-time clock and a miniature passive vibration sensor. The system is woken up through an ultra-low power timer set by the RTC, or interrupted and woken up when the water pump generates abnormal high-frequency resonance that triggers the passive vibration sensor. This allows for dynamic fine-tuning of the pre-tightening force, transforming it into an "active vibration damper," thereby significantly suppressing operational vibration and extending pipeline life.

[0040] In this embodiment, specifically, through system verification, compared to the traditional hoisting process that relies solely on manual experience for wellhead positioning, the multi-source sensing fusion and downhole follow-up closed-loop control of this invention can achieve a pipeline collision warning accuracy of over 98%, reduce pipeline sway amplitude by over 80% during the lowering process, and stably control the overall curvature of the entire pipeline section within 0.5‰. The operational accuracy is significantly improved from the traditional experience-based centimeter level to a definite millimeter level, completely avoiding damage to the anti-corrosion layer and failure of the flange seal. At the same time, the lowering process automatically completes the straightening and correction, improving the reinstallation efficiency by over 40%, and greatly reducing the time and risk of high-altitude operations.

[0041] The embodiments described above merely illustrate specific implementation methods of this application, and while the descriptions are detailed and specific, they should not be construed as limiting the scope of protection of this application. It should be noted that those skilled in the art can make various modifications and improvements without departing from the concept of the technical solution of this application, and these modifications and improvements all fall within the scope of protection of this application.

[0042] This background section is provided to generally present the context of the invention. The work of the currently named inventors, the work to the extent described in this background section, and aspects of this section that did not constitute prior art at the time of application are neither expressly nor impliedly acknowledged as prior art to the invention.

Claims

1. A method for intelligent downhole straightening and fixing during the reinstallation of a deep well pump delivery pipe, characterized in that, include: Step S1: Pre-installing fixing claws: Multiple sets of fixing claws are pre-installed along the axial direction on the outer wall of each single pipe section. Each set of fixing claws includes multiple telescopic claw arms that are evenly distributed along the circumference of the single pipe. The ends of the telescopic claw arms are provided with contacts. All fixing claws are communicatively connected to the main control unit in the intelligent monitoring platform deployed at the wellhead. Step S2: Deploy the intelligent monitoring platform at the wellhead: Build the intelligent monitoring platform at the wellhead. The intelligent monitoring platform integrates the main control unit and the AI ​​analysis module. Multiple sets of ranging sensors are distributed at the lower end of the first single pipe section and along the pipe body. The ranging sensors are communicatively connected to the main control unit. Step S3: Sectional Lowering and Real-time Attitude Monitoring: The single pipe sections are connected one by one to form a water delivery pipe string and lowered into the well. During the lowering process, the distance sensor collects the distance data between the water delivery pipe string and the well wall in each circumferential direction in real time. The AI ​​analysis module calculates the center offset, sway amplitude, and axial curvature of the water delivery pipe string in real time based on the distance data. When the distance data in a certain direction is less than the safety threshold, an early warning signal is triggered. Step S4: Adaptive straightening control: When the AI ​​analysis module detects that the center offset of the water delivery pipe string exceeds the standard, the swaying amplitude exceeds the standard, or there is a risk of collision, it outputs a control command to control the telescopic claw arm in the corresponding position to extend so that the contact point abuts against the well wall. By differentially adjusting the extension amount and pre-tightening force of each telescopic claw arm, the center position of the water delivery pipe string is actively corrected and the bending deformation is corrected, forming a multi-point straightening constraint, so that the entire pipeline and the axis of the well barrel remain coaxial. Step S5: Pipeline placement and device disposal: After all the single pipes are lowered and installed in place, control the retractable claw arm to retract and release the fixing claw from the water delivery pipe string, and retract the fixing claw; or keep the retractable claw arm in a tightened state, so that the fixing claw is permanently left in the wellbore as a long-term uprighting support.

2. The method for intelligent downhole straightening and fixing during the reinstallation of a deep well pump delivery pipe according to claim 1, characterized in that, The fixing claw is a magnetic fixing claw, which includes an electromagnetic chuck and a control cable; In step S1, the magnetic fixing claw is attached to the outer wall of the single tube by the electromagnetic chuck, and the control cable is laid along the outer wall of the single tube and connected to the main control unit of the intelligent monitoring platform for power supply and signal transmission. In step S5, when the retractable claw arm is retracted and the fixing claw is released from the water delivery pipe column, the specific operation is as follows: the electromagnetic chuck is de-energized and demagnetized, so that the magnetic fixing claw is lifted and retracted together with the hoisting equipment.

3. The method for intelligent downhole straightening and fixing during the reinstallation of a deep well pump delivery pipe according to claim 1, characterized in that, The fixing claw is a welded fixing claw, and the welded fixing claw has a built-in high-temperature energy storage battery and a wireless communication module; In step S1, the welding-type fixing claw is welded and fixed to the outer wall of the single pipe body, and communicates with the main control unit of the intelligent monitoring platform through the wireless communication module; In step S5, when the retractable claw arm is kept in a tightened state so that the fixed claw is permanently retained in the wellbore, the retractable claw arm is kept in a slightly tightened state as a long-term uprighting support for the water delivery pipe string.

4. The method for intelligent downhole straightening and fixing during the reinstallation of a deep well pump delivery pipe according to claim 1, characterized in that, In step S1, each section of the single tube is pre-installed with 2 to 4 sets of fixing claws along the axial direction. Each set of fixing claws includes 3 to 4 retractable claw arms evenly distributed along the circumference of the single tube, and the contact is a wear-resistant and non-slip contact.

5. The method for intelligent downhole straightening and fixing during the reinstallation of a deep well pump delivery pipe according to claim 1, characterized in that, In step S2, the ranging sensor includes a laser ranging sensor and a millimeter-wave radar; The lower end of the first section of the single pipe is also equipped with an explosion-proof camera. The explosion-proof camera is connected to the main control unit and is used to synchronously transmit video footage of the area surrounding the lowering of the water delivery pipe string in step 3.

6. The method for intelligent downhole straightening and fixing during the reinstallation of a deep well pump delivery pipe according to claim 1, characterized in that, In step S3, the specific process by which the AI ​​analysis module calculates the axial curvature of the water delivery pipe string is as follows: The AI ​​analysis module extracts multiple sets of real-time distance data collected by the ranging sensors and combines them with historical depth displacement data recorded during the descent of the water delivery pipe section by section to construct a three-dimensional spatial posture model of the water delivery pipe section within the wellbore. The actual central axis of the water delivery pipe string is fitted based on the three-dimensional spatial posture model, and the actual central axis is compared with the standard axis of the wellbore to calculate the axial curvature of the water delivery pipe string.

7. A method for intelligent downhole straightening and fixing during the reinstallation of a deep well pump delivery pipe according to claim 1 or 6, characterized in that, In step S3, the safety threshold is dynamically set based on the diameter of the wellbore and the material of the water delivery pipe string, and the minimum safety distance is not less than 20mm. When the axial curvature exceeds 1‰, the AI ​​analysis module determines that there is a collision risk and triggers the warning signal.

8. The method for intelligent downhole straightening and fixing during the reinstallation of a deep well pump delivery pipe according to claim 1, characterized in that, In step S4, when the AI ​​analysis module differentially adjusts the extension amount and preload of each of the retractable claw arms, it follows a graded and gradual principle, specifically including: When the warning signal is triggered in the early stage, the retractable claw arm in the corresponding position is extended until the contact approaches the well wall to form a limiting constraint. When the shaking amplitude of the riser pipe string is detected to increase, the preload of the telescopic claw arm is gradually increased to make the contact point press against the well wall, so as to avoid the riser pipe string from rebounding due to a sudden large thrust.

9. The method for intelligent downhole straightening and fixing during the reinstallation of a deep well pump delivery pipe according to claim 1, characterized in that, In step S4, when the AI ​​analysis module detects that the water supply pipe column is bent due to its own weight, the AI ​​analysis module outputs a control command to control the telescopic claw arm of the fixed claw in the middle section located on the convex side of the curved surface to increase the extension amount and the pre-tightening force, and correct it by differential tightening until the curvature of the entire pipeline is controlled within the target range.

10. The method for intelligent downhole straightening and fixing during the reinstallation of a deep well pump delivery pipe according to claim 3, characterized in that, In step S5, the specific operation of permanently retaining the fixing claw inside the wellbore as a long-term uprighting support includes: The retractable claw arm controlling all the fixed claws maintains a pre-tightening force of 0.5 kN within the wellbore; During the daily operation of the deep well pump, the fixed claw, which is in a dormant state, is periodically awakened to detect the pipeline posture, and the preload is dynamically fine-tuned according to the pipeline posture to suppress pipeline vibration during pump operation.

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