A wire-line coring drilling while drilling measurement system power supply device and a detection method thereof

Abstract

This invention relates to the field of measurement-while-drilling (MWD) technology, and discloses a power supply device and its detection method for a wireline coring MWD system. The detection method includes: acquiring electrical connection impedance data of the power supply device before deployment, and the amplitude and phase shift of the magnetic coupling transmission induced voltage after deployment; determining the internal connection integrity status and coupling docking status; monitoring leakage current data in the external insulation area of ​​the power supply device during drilling operations to obtain an insulation performance safety assessment index; determining a power supply health score by comprehensively considering the internal connection integrity status, coupling docking status, and insulation performance safety assessment index; predicting the failure probability of the power supply device before the next wireline retrieval window based on the decay trend of the power supply health score and the estimated operation time of the remaining depth data; and generating a power supply device replacement instruction based on the failure probability. This invention improves the reliability and safety of the power supply device.

Description

Technical Field

[0001] This invention relates to the field of measurement while drilling technology, and more specifically, to a power supply device and its testing method for a measurement while drilling system for wireline coring drilling. Background Technology

[0002] Currently, measurement-while-drilling (MWD) technology, especially MWD systems used to acquire formation and engineering parameters, has been widely applied in the oil drilling field, playing a significant role in reducing drilling costs, improving construction efficiency, and obtaining key parameters. To further enhance the informatization and intelligentization of geological core drilling operations, technical personnel are attempting to introduce mature MWD technology from the oil drilling field into wireline coring drilling processes, aiming to improve operational efficiency and enhance construction safety.

[0003] In existing technologies, wireline coring drilling differs significantly from oil drilling in terms of structure and operation. Due to the near-full-hole drill string arrangement and relatively thin drill pipe walls in wireline coring drilling, downhole space is limited, making it difficult to provide sufficient space for power supply equipment. Therefore, it is not possible to directly use the high-capacity battery power supply method commonly used in oil drilling, and consequently, it is difficult to configure downhole power generation equipment to achieve continuous power supply.

[0004] Therefore, it is necessary to design a power supply device and its testing method for a wireline coring drilling measurement-while-drilling system to solve the problems existing in the current technology. Summary of the Invention

[0005] In view of this, the present invention proposes a power supply device and its detection method for a wireline coring drilling measurement-while-drilling system, aiming to solve the problem of difficulty in configuring downhole power generation devices to achieve continuous power supply.

[0006] On one hand, this invention proposes a method for detecting the power supply device of a wireline coring drilling measurement-while-drilling system, comprising: Acquire electrical connection impedance data of the power supply device before deployment, and amplitude and phase offset of magnetic coupling transmission induced voltage after deployment; The internal connection integrity status is determined based on the electrical connection impedance data; the coupling docking status is determined based on the induced voltage amplitude and phase offset. During the drilling operation, the leakage current data of the external insulation area of ​​the power supply device is monitored, and the leakage current data is compared with the safety threshold to obtain the insulation performance safety assessment index. By combining the internal connection integrity status, coupling and docking status, and insulation performance safety assessment indicators, a multi-dimensional state vector is constructed to determine the power supply health score. The remaining depth data and rope retrieval window data for the current drilling cycle are obtained. Based on the decay trend of the power supply health score and the estimated operation time of the remaining depth data, the failure probability of the power supply device before the next rope retrieval window is predicted. And based on the failure probability, a power supply device replacement instruction is generated.

[0007] Furthermore, when acquiring electrical connection impedance data of the power supply device before commissioning, this includes: An AC test signal is injected into the internal connection port of the power supply device; the voltage response value and the current response value are obtained; and the electrical connection impedance data is obtained based on the ratio of the voltage response value to the current response value.

[0008] Furthermore, when determining the coupling docking state based on the amplitude and phase offset of the induced voltage, the following steps are included: The amplitude of the induced voltage is compared with the standard coupling voltage curve, and the phase offset is compared with the standard phase curve; the coupling docking status is determined based on the comparison results.

[0009] Furthermore, when comparing the leakage current data with the safety threshold, the process includes: Acquire downhole ambient temperature data; perform temperature compensation correction on the safety threshold based on the downhole ambient temperature data to obtain a dynamic safety threshold; compare the leakage current data with the dynamic safety threshold to obtain an insulation performance safety assessment index.

[0010] Furthermore, when constructing a multi-dimensional state vector to determine the power supply health score, the following factors are included: Weighting coefficients are assigned to the internal connection integrity status, coupling docking status, and insulation performance safety assessment indicators; the internal connection integrity status, coupling docking status, and insulation performance safety assessment indicators are weighted and fused based on the weighting coefficients to obtain the power supply health score.

[0011] Furthermore, the power supply health score sequence of historical drilling rounds is obtained; the power supply health score sequence is linearly fitted to obtain the health decay rate; and the decay trend of the power supply health score is determined based on the health decay rate.

[0012] Furthermore, the average mechanical drilling rate of the current drilling cycle is obtained; based on the remaining depth data and the average mechanical drilling rate, the estimated operation time is determined.

[0013] Furthermore, when predicting the failure probability of the power supply unit before the next rope retrieval window, the following is included: Based on the decay trend of the power supply health score, the estimated remaining lifespan required for the power supply health score to drop to the failure threshold is determined; the estimated remaining lifespan is compared with the remaining operation time before the next rope retrieval window; when the estimated remaining lifespan is less than or equal to the remaining operation time, the failure probability is determined to be at a high risk level; when the estimated remaining lifespan is greater than the remaining operation time, the failure probability is determined to be at a low risk level.

[0014] Furthermore, when generating a power supply replacement command based on the aforementioned failure probability, the following steps are included: Determine whether the failure probability exceeds a preset risk range; if so, generate a power supply device replacement command. The power supply device replacement instruction includes a suggested replacement time window that matches the rope retrieval window data, as well as maintenance priority information.

[0015] On the other hand, this application also provides a power supply device for a wireline coring drilling measurement-while-drilling system, and a testing method for applying the above-mentioned power supply device for the wireline coring drilling measurement-while-drilling system, comprising: The outer tube has a hollow, thin-walled structure, and the inner hole has a stepped surface. The magnetic ring is a hollow circular ring structure and is disposed at the inner stepped surface of the outer tube. A power supply assembly, deployably disposed inside the outer tube, includes a battery cylinder, a magnetic connector, a battery, and a sealing connector. The sealing connector is located at the top of the power supply assembly. The battery cylinder has a thick-walled hollow structure, with its upper end connected to the sealing connector and its lower end connected to the magnetic connector, forming a cable channel inside for mounting conductive cables. The battery is disposed inside the battery cylinder and connected to the magnetic connector via conductive cables. The magnetic connector has a thick-walled structure with a stepped surface of varying outer diameter, and an insulating coating is provided on the surface other than the stepped surface.

[0016] Compared with existing technologies, the advantages of this invention are as follows: By acquiring electrical connection impedance data before deployment and obtaining the induced voltage amplitude and phase shift during magnetic coupling transmission after deployment, phased detection of the internal connection status and coupling docking status of the power supply device is achieved. During drilling operations, real-time monitoring of leakage current in the external insulation area of ​​the power supply device, combined with comparative analysis using safety thresholds, enables dynamic evaluation of insulation performance, improving the operational safety of the power supply device in complex downhole environments. By integrating internal connection integrity status, coupling docking status, and insulation performance safety assessment indicators, a multi-dimensional state vector is constructed and weighted analysis is performed to obtain a power supply health score, achieving a quantitative evaluation of the overall operating status of the power supply device. Combining the remaining depth data of each drilling cycle and the rope retrieval window information, and introducing the decay trend of the power supply health score, the failure probability of the power supply device before the next retrieval cycle is predicted, thereby enabling early identification of potential failure risks and realizing a shift from passive maintenance to predictive maintenance. The system generates power supply unit replacement instructions based on failure probability, and provides replacement times and maintenance priorities matching the retrieval window. This optimizes operation scheduling and avoids downtime or rework caused by sudden power supply unit failures. The power supply unit structure, through the coordinated design of the outer tube, magnetic ring, and deployable power supply components, can adapt to the space-constrained conditions of wireline coring drilling, enabling rapid deployment and retrieval of the power supply components. The cooperation between the magnetic connector and the magnetic ring improves the stability of energy transmission; the insulating coating enhances the insulation performance and environmental adaptability of the device, thereby improving the overall reliability and safety of the power supply unit. Attached Figure Description

[0017] Various other advantages and benefits will become apparent to those skilled in the art upon reading the following detailed description of preferred embodiments. The accompanying drawings are for illustrative purposes only and are not intended to limit the invention. Furthermore, the same reference numerals denote the same parts throughout the drawings. In the drawings: Figure 1 A flowchart illustrating the detection method of the power supply device for the wireline coring drilling measurement-while-drilling system provided in this embodiment of the invention; Figure 2 This is a schematic diagram of the power supply device for the wireline coring drilling measurement-while-drilling system provided in an embodiment of the present invention.

[0018] Among them, 1. outer tube; 2. battery tube; 3. magnetic connector; 4. battery; 5. sealing connector; 6. magnetic ring. Detailed Implementation

[0019] Exemplary embodiments of the present disclosure will now be described in more detail with reference to the accompanying drawings. While exemplary embodiments of the present disclosure are shown in the drawings, it should be understood that the present disclosure may be implemented in various forms and should not be limited to the embodiments set forth herein. Rather, these embodiments are provided to enable a more thorough understanding of the present disclosure and to fully convey the scope of the disclosure to those skilled in the art. It should be noted that, unless otherwise specified, embodiments and features in the embodiments of the present invention can be combined with each other. The present invention will now be described in detail with reference to the accompanying drawings and embodiments.

[0020] In some embodiments of this application, see Figure 1 As shown, a testing method for the power supply device of a wireline coring drilling measurement-while-drilling system is proposed, including: S100: Acquire electrical connection impedance data of the power supply device before deployment, and amplitude and phase offset of magnetic coupling transmission induced voltage after deployment; S200: Determines the internal connection integrity status based on electrical connection impedance data; determines the coupling docking status based on induced voltage amplitude and phase offset. S300: During drilling operations, monitor the leakage current data of the external insulation area of ​​the power supply device, compare the leakage current data with the safety threshold, and obtain the insulation performance safety assessment index. S400: By integrating internal connection integrity status, coupling docking status, and insulation performance safety assessment indicators, a multi-dimensional state vector is constructed to determine the power supply health score; the remaining depth data and rope retrieval window data of the current drilling cycle are obtained; based on the decay trend of the power supply health score and the estimated operation time of the remaining depth data, the failure probability of the power supply device before the next rope retrieval window is predicted; and a power supply device replacement instruction is generated based on the failure probability.

[0021] Specifically, in step S100, before the power supply device is deployed underground, an AC test signal with a preset frequency and amplitude is injected into the internal connection port of the power supply device through an external detection device, and the corresponding voltage response signal and current response signal are collected simultaneously. The electrical connection impedance data is calculated based on the ratio of voltage to current, which is used to characterize the connectivity and contact quality of the internal conductive path of the power supply device. After the power supply device is deployed underground and magnetic coupling docking is completed, the induced voltage amplitude and phase offset during the magnetic coupling transmission process are obtained through a signal acquisition module set at the receiving end. The induced voltage amplitude is used to reflect the energy transmission efficiency, and the phase offset is used to characterize the degree of coupling matching.

[0022] Specifically, in step S200, the acquired electrical connection impedance data is compared with a pre-established standard impedance range. When the impedance value is within the normal range, the internal connection integrity is determined to be normal; otherwise, it is determined to be an abnormal connection or poor contact. At the same time, the induced voltage amplitude is matched with the standard coupling voltage curve, and the phase offset is compared with the standard phase reference curve. The magnetic coupling docking status is comprehensively judged based on the amplitude deviation and the degree of phase offset, for example, classified into good docking, deviation docking, or mismatch docking status levels.

[0023] Specifically, in step S300, during the continuous drilling operation, leakage current data is collected in real time by a current detection unit set in the external insulation area of ​​the power supply device, and the leakage current data is compared with a preset safety threshold. In practical applications, the safety threshold can also be dynamically corrected in combination with the downhole ambient temperature to adapt to different working conditions. When the leakage current exceeds the corrected safety threshold, it is determined that there is a risk of deterioration in the insulation performance, and an insulation performance safety assessment index is generated accordingly. This index can be expressed in the form of graded or continuous numerical values ​​to represent the insulation health level.

[0024] Specifically, in step S400, the obtained internal connection integrity status, coupling docking status, and insulation performance safety assessment indicators are uniformly quantified and weighted according to preset weight coefficients to construct a multi-dimensional state vector, thereby calculating the power supply health score, which is used to comprehensively characterize the overall operating status of the power supply device. Simultaneously, the system further acquires the remaining depth data of the current drilling cycle and the corresponding rope retrieval window data, and combines this with the changes in the power supply health score in historical cycles to determine the decay trend of the health score; based on the remaining depth and drilling parameters (such as average mechanical drilling speed), the remaining operation time is estimated, and this is correlated with the power supply health decay trend to predict the probability of the power supply device failing before the next rope retrieval window. When the prediction result indicates that the failure probability reaches or exceeds a preset risk threshold, the system automatically generates a power supply device replacement instruction. This instruction may include a recommended replacement time window and maintenance priority information to guide on-site personnel to replace the power supply device at an appropriate retrieval time.

[0025] Understandably, by acquiring electrical connection impedance data and magnetic coupling transmission parameters before and after the power supply unit is deployed, the internal connection status and coupling docking status can be effectively determined, improving the accuracy of power supply unit status identification. Introducing a leakage current monitoring mechanism during drilling allows for dynamic evaluation of insulation performance, enhancing downhole operational safety. Constructing a multi-dimensional state vector and calculating a power supply health score enables comprehensive quantitative analysis of the overall power supply unit status. Furthermore, combining drilling progress with health degradation trends allows for prediction of power supply unit failure probability, generating replacement instructions accordingly, thus achieving predictive maintenance.

[0026] In some embodiments of this application, obtaining electrical connection impedance data of the power supply device before commissioning includes: An AC test signal is injected into the internal connection port of the power supply device; the voltage response value and the current response value are obtained; and the electrical connection impedance data is obtained based on the ratio of the voltage response value to the current response value.

[0027] Specifically, the process begins with the detection terminal or a preset test module establishing an electrical connection with the internal connection port of the power supply device and injecting an AC test signal into the port. This AC test signal can use a preset frequency, preset amplitude, and preset waveform to minimize the impact on the normal state of the internal components while ensuring the test results reflect the actual connection status of the internal conductive circuits. Subsequently, the detection module synchronously acquires the voltage and current response values ​​after the AC test signal is applied to the internal connection port. The voltage response value characterizes the voltage changes along the internal connection path of the power supply device, and the current response value characterizes the conduction current of the test signal along the internal connection path. Based on the acquired voltage and current response values, the electrical connection impedance data is calculated according to their ratio. This impedance data characterizes the comprehensive connection characteristics of the internal connection port, conductive cables, connection points, and related conductive paths of the power supply device. When the impedance data is within the preset normal range, it indicates a relatively stable internal connection. If the impedance data deviates from the normal range, it can be further determined that there are abnormalities such as poor contact, loose connection, partial discontinuity, or connection aging.

[0028] Understandably, by injecting AC test signals and collecting voltage and current response values ​​before deployment, internal connection impedance data can be obtained quickly and accurately without affecting the normal assembly of the power supply device, thereby enabling early judgment of the integrity of the internal connection.

[0029] In some embodiments of this application, determining the coupling docking state based on the induced voltage amplitude and phase offset includes: The amplitude of the induced voltage is compared with the standard coupling voltage curve, and the phase offset is compared with the standard phase curve; the coupling docking status is determined based on the comparison results.

[0030] Specifically, during the system calibration phase, standard coupling voltage and phase curves are pre-established. These standard curves are obtained through experimental measurements or simulation modeling of the magnetic coupling structure under ideal docking conditions at different operating frequencies, gap distances, and coaxial alignment states, and serve as a reference for subsequent state determination. After the power supply device is deployed underground and magnetic coupling docking is completed, the induced voltage amplitude and phase shift during magnetic coupling transmission are acquired in real time via a signal acquisition module. The induced voltage amplitude reflects the energy coupling efficiency, and the phase shift reflects the degree of electromagnetic coupling matching between the transmitter and receiver. Subsequently, the measured induced voltage amplitude is compared and analyzed with the standard coupling voltage curve to determine the amplitude deviation range; simultaneously, the measured phase shift is matched with the standard phase curve to determine the degree of phase shift. Furthermore, multi-level judgment rules can be set according to the combination of amplitude deviation and phase offset. For example, when the amplitude deviation is within the first threshold range and the phase offset is small, it is judged that the coupling and docking status is good; when the amplitude has a certain attenuation and the phase offset increases, it is judged that there is a deviation in docking; when the amplitude decreases significantly and the phase offset is abnormal, it is judged that the coupling is mismatched or the docking is abnormal.

[0031] Understandably, by comparing the induced voltage amplitude and phase offset with the standard coupling voltage curve and the standard phase curve, respectively, the magnetic coupling docking status can be comprehensively determined from two dimensions: energy transfer efficiency and coupling matching degree, thereby improving the accuracy and sensitivity of docking status identification.

[0032] In some embodiments of this application, comparing leakage current data with a safety threshold includes: Acquire downhole ambient temperature data; perform temperature compensation correction on the safety threshold based on the downhole ambient temperature data to obtain the dynamic safety threshold; compare the leakage current data with the dynamic safety threshold to obtain the insulation performance safety assessment index.

[0033] Specifically, firstly, real-time ambient temperature data of the power supply unit's location is acquired by a temperature acquisition unit installed in the downhole environment. This unit can be integrated into the power supply unit's casing or adjacent structure to ensure that the acquired temperature accurately reflects the thermal environment endured by the insulation structure. Since the electrical properties of insulation materials change with temperature, especially at high temperatures where their volume resistivity and surface resistivity may decrease, leading to a natural increase in leakage current, this embodiment pre-establishes a mapping relationship or compensation model between temperature and safety thresholds. Specifically, based on experimental calibration or historical operating data, the allowable leakage current range corresponding to different temperature intervals can be determined, and the original safety threshold can be corrected for temperature compensation to obtain a dynamic safety threshold that matches the current ambient temperature.

[0034] Specifically, during actual testing, real-time leakage current data is input into the processing module and compared with the dynamic safety threshold under the corresponding temperature conditions. When the leakage current data is below the dynamic safety threshold, the insulation performance is determined to be in a safe state. When the leakage current data approaches or exceeds the dynamic safety threshold, the insulation performance is determined to have a deteriorating trend or potential risk. Furthermore, the insulation performance can be graded and evaluated based on the degree of deviation between the leakage current and the dynamic safety threshold, for example, classified into normal, warning, and dangerous levels, and the evaluation result is quantified as an insulation performance safety assessment index.

[0035] Understandably, by introducing downhole ambient temperature data to dynamically compensate and correct the safety threshold, the leakage current judgment standard can adapt to the changing characteristics of insulation performance under different temperature conditions, avoiding misjudgment or omission due to temperature fluctuations, thereby improving the accuracy and reliability of insulation status assessment.

[0036] In some embodiments of this application, when constructing a multidimensional state vector to determine the power supply health score, the following steps are included: Weighting coefficients are assigned to the internal connection integrity status, coupling docking status, and insulation performance safety assessment indicators; based on the weighting coefficients, the internal connection integrity status, coupling docking status, and insulation performance safety assessment indicators are weighted and fused to obtain the power supply health score.

[0037] Specifically, the internal connection integrity status, coupling status, and insulation performance safety assessment indicators are first uniformly quantified. Specifically, the internal connection integrity status can be mapped to continuous or graded values ​​based on the detection results; for example, qtz "normal connection," "minor abnormality," and "serious abnormality" can be mapped to different ranges of values. Similarly, the coupling status is mapped to quantitative indicators characterizing coupling quality based on the magnitude deviation and phase shift of the induced voltage. For the insulation performance safety assessment indicators, continuous or graded scores based on the comparison results of leakage current and dynamic safety thresholds can be directly used. Subsequently, according to the impact of each indicator on the overall operational reliability of the power supply device, corresponding weighting coefficients are pre-set. These weighting coefficients can be obtained through historical operational data statistical analysis, expert experience setting, or optimization algorithm training, and can be adaptively adjusted according to different operating conditions.

[0038] Specifically, after quantifying and weighting the indicators across all dimensions, the quantified values ​​of internal connection integrity, coupling and docking status, and insulation performance safety assessment indicators are weighted and fused according to their respective weights to construct a multi-dimensional state vector. The power supply health score is then obtained through weighted summation or normalization. Furthermore, the power supply health score can be divided into intervals, such as healthy, sub-healthy, and risky states, to facilitate subsequent state determination and decision-making control.

[0039] Understandably, by quantifying and weighting the internal connection status, coupling and docking status, and insulation performance in multiple dimensions, a comprehensive evaluation of the overall operating status of the power supply device is achieved, reflecting the health level of the power supply device. By reasonably allocating weight coefficients, key influencing factors occupy a higher proportion in the score, thereby improving the accuracy and sensitivity of the health assessment.

[0040] In some embodiments of this application, a power supply health score sequence of historical drilling rounds is obtained; the power supply health score sequence is linearly fitted to obtain the health decay rate; and the decay trend of the power supply health score is determined based on the health decay rate.

[0041] Specifically, the first step is to obtain the power supply health score sequence corresponding to multiple historical drilling runs. Specifically, the power supply health score calculated at the end of each run can be recorded and stored according to the drilling run sequence or time sequence, forming a sequence data with time tags or run numbers. Based on this, the power supply health score sequence is preprocessed, such as removing outliers, performing smoothing filtering, or normalization, to improve the stability and accuracy of subsequent fitting analysis. Then, using the drilling run number or time as the independent variable and the power supply health score as the dependent variable, a linear fitting method is used to model the score sequence, obtaining the corresponding fitting function. The slope of the fitting function is then extracted as the health decay rate; where a negative slope indicates that the power supply health is decreasing as the operation progresses, and the larger the absolute value of the slope, the faster the decay rate.

[0042] Specifically, based on the health decay rate and the fitted model, the trend of power supply health changes in the current and future periods can be predicted. For example, the health score of the current cycle can be combined to extrapolate and predict the health level of subsequent cycles, thereby determining whether it is close to the preset failure threshold. Furthermore, in some implementations, the fitted model can be segmented or a correction coefficient can be introduced according to different operating conditions (such as well depth, temperature, vibration intensity, etc.) to improve the accuracy and adaptability of the decay trend judgment. Based on the above analysis results, the decay trend of the power supply health score is determined.

[0043] Understandably, by linearly fitting the power supply health score sequence of historical drilling operations, it is possible to quantitatively describe the changes in power supply equipment performance over time or during operation, thus realizing a shift from static state assessment to dynamic trend analysis. Introducing the health decay rate can visually reflect the speed of performance degradation, facilitating the early identification of potential risks.

[0044] In some embodiments of this application, the average mechanical drilling rate of the current drilling cycle is obtained; the estimated operation time is determined based on the remaining depth data and the average mechanical drilling rate.

[0045] Specifically, the first step is to obtain the average mechanical drilling rate (MRR) for the current drilling run. This can be achieved by real-time acquisition of drill bit displacement and time data through a surface monitoring system or a measurement-while-drilling (MWD) system. The instantaneous RMR is calculated based on the change in drilling footage per unit time, and then statistically averaged over a time window to obtain the average RMR. In practical applications, abnormal fluctuations can be filtered out or weighted smoothed to improve the stability and representativeness of the average RMR. Next, the remaining depth data for the current drilling run is obtained. This data can be determined by the difference between the current well depth and the target well depth for this run. After obtaining the average RMR and remaining depth data, the estimated operation time required to complete the remaining drilling task is calculated by establishing a correspondence between the two. For example, the estimated operation time can be determined by the ratio of the remaining depth to the average RMR. In some implementations, the estimated operation time can be corrected by considering factors such as different formation conditions, changes in drilling pressure, or adjustments in drilling speed to further improve prediction accuracy. Finally, an estimated operation time parameter reflecting the duration of subsequent operations in the current run is obtained.

[0046] Understandably, by introducing average mechanical drilling speed and remaining depth data to calculate the expected operation time, the assessment of the power supply unit's operating time is transformed from an empirical estimate to a quantitative analysis based on actual operating parameters, reflecting the remaining operation requirements of the current drilling cycle.

[0047] In some embodiments of this application, predicting the failure probability of the power supply device before the next rope retrieval window includes: Based on the decay trend of the power supply health score, the estimated remaining lifespan required for the power supply health score to drop to the failure threshold is determined; the estimated remaining lifespan is compared with the remaining operation time before the next rope retrieval window; when the estimated remaining lifespan is less than or equal to the remaining operation time, the failure probability is determined to be of a high-risk level; when the estimated remaining lifespan is greater than the remaining operation time, the failure probability is determined to be of a low-risk level.

[0048] Specifically, firstly, based on the aforementioned power supply health score and its decay trend, a trend model of health changes over time or drilling cycles is established. Specifically, linear fitting or other trend extrapolation methods can be used, taking the current power supply health score as the initial value and combining it with the health decay rate, to predict health changes over a future period. Based on this, a failure threshold for the power supply device is set. When the power supply health score drops to this threshold, the power supply device is determined to have entered a failure or unavailable state. By calculating the intersection of the trend model and the failure threshold, the estimated remaining lifetime required for the power supply health score to drop to the failure threshold is determined.

[0049] Specifically, the remaining operating time between the current drilling cycle and the next wireline retrieval window is obtained. This time can be calculated from parameters such as the remaining drilling depth and average mechanical drilling rate. After obtaining the expected remaining lifespan and the remaining operating time, the two are compared and analyzed: when the expected remaining lifespan is less than or equal to the remaining operating time, it indicates that the power supply device has a high probability of failure before the next retrieval window arrives, and the failure probability is classified as high-risk; when the expected remaining lifespan is greater than the remaining operating time, it indicates that the power supply device can support the next retrieval window, and the failure risk is relatively low, and it is classified as low-risk. In some implementations, the risk level classification can be further refined, for example, by dividing it into multiple risk intervals based on the difference between the two values, to achieve a more refined risk assessment.

[0050] Understandably, by combining the trend of power supply health degradation with the actual work progress, a comparison relationship between remaining lifespan and remaining working time is established, enabling quantitative prediction of power supply failure risk and transforming maintenance decisions from post-event response to pre-event prediction.

[0051] In some embodiments of this application, when generating a power supply device replacement command based on the failure probability, the following is included: Determine if the failure probability exceeds the preset risk range; if so, generate a power supply device replacement command. The power supply replacement instruction includes a suggested replacement time window that matches the rope retrieval window data, as well as maintenance priority information.

[0052] Specifically, the control processing module first determines the aforementioned failure probability or corresponding risk level and compares it with a pre-set risk range. This pre-set risk range can be set based on actual engineering experience or historical operating data, for example, corresponding to a high-risk level or an interval exceeding a certain probability threshold. When the determination result indicates that the current failure probability exceeds the pre-set risk range, the replacement decision logic is triggered, and the system automatically generates a power supply device replacement command.

[0053] Specifically, in generating replacement instructions, the system first determines the time interval for executing replacement operations by combining information from the current drilling cycle and the rope retrieval window. The rope retrieval window typically corresponds to the retrieval operation period at the end or interruption of each drilling cycle. Therefore, based on the remaining operation time and the predicted failure time, the system prioritizes matching the replacement operation to the closest and most suitable retrieval window, thus forming a suggested replacement time window. Simultaneously, the system can also prioritize maintenance tasks based on the specific value of the failure probability or the risk level. For example, when the failure probability is significantly higher than a threshold, it is assigned high priority and a priority replacement is suggested; when it is in a critical range, it is assigned medium priority and a focus on monitoring or advance preparation of replacement resources is recommended.

[0054] Understandably, by comparing the failure probability with the preset risk range and automatically generating replacement instructions, the maintenance decision-making of the power supply device is automated and intelligent. Replacement operations can be planned in advance within a controllable risk range, avoiding sudden failures. By matching the replacement time with the rope retrieval window, the existing operation process is effectively utilized without adding extra operation steps, thereby improving construction efficiency.

[0055] Based on another preferred embodiment described above, see [link to preferred embodiment]. Figure 2 As shown, this embodiment provides a power supply device for a wireline coring drilling measurement-while-drilling system, and a testing method for applying the power supply device of the wireline coring drilling measurement-while-drilling system, including: The outer tube 1 has a hollow, thin-walled structure, and its inner hole has a stepped surface. The magnetic ring 6 is a hollow circular ring structure and is located at the inner stepped surface of the outer tube 1; The power supply assembly, which can be disposed inside the outer tube 1, includes a battery cylinder 2, a magnetic connector 3, a battery 4, and a sealing connector 5. The sealing connector 5 is disposed at the top of the power supply assembly. The battery cylinder 2 is a thick-walled hollow structure, with its upper end connected to the sealing connector 5 and its lower end connected to the magnetic connector 3. The interior forms a cable channel for setting conductive cables. The battery 4 is disposed inside the battery cylinder 2 and is connected to the magnetic connector 3 through conductive cables. The magnetic connector 3 is a thick-walled structure with a stepped surface with varying outer diameter. The surface outside the stepped surface is provided with an insulating coating.

[0056] Specifically, the power supply device mainly includes an outer tube 1, a magnetic ring 6, and a deployable power supply component. The power supply component is located inside the outer tube 1 and can be deployed and retrieved during rope operations.

[0057] Specifically, the outer tube 1 is part of the core drilling tool's outer tube 1 structure, and its overall form is a hollow thin-walled structure to meet the requirements of limited downhole space and structural strength. The inner hole of the outer tube 1 has a stepped structure along the axial direction, wherein the inner diameter of the upper part is larger than the inner diameter of the lower part, thereby forming a stepped surface for installing the positioning magnetic ring 6; at the same time, the outer wall of the outer tube 1 can be integrated with a drilling measurement system, or in some embodiments, it can only serve as a power supply channel with a conductive structure to transmit electrical energy to an external power unit.

[0058] Specifically, the power supply assembly is located inside the outer tube 1, including a battery cylinder 2, a magnetic connector 3, a battery 4, and a sealing connector 5. The battery cylinder 2 is a thick-walled hollow structure, its inner cavity accommodating the battery 4 and conductive cables. The upper inner wall of the battery cylinder 2 has a female threaded connection, which connects to the male threaded connection on the right end of the sealing connector 5 for axial fixation and sealing. The upper outer wall of the battery cylinder 2 also has a male threaded connection for connection with other structures. The lower outer wall also has a male threaded connection, which connects to the female threaded connection on the upper inner wall of the magnetic connector 3. The inner diameter of the battery cylinder 2 is wider at the top and narrower at the bottom along the axial direction. A small hole at the lower end is used to arrange the conductive cables, ensuring a stable transmission of electrical energy from the battery 4 to the magnetic connector 3.

[0059] Specifically, the magnetic connector 3 has a thick-walled structure, partially hollow overall, with a solid lower end for enhanced strength. The upper inner wall has a female thread for threaded connection with the male thread at the lower end of the battery cylinder 2. Simultaneously, a small hole corresponding to the battery cylinder 2 is provided on the upper inner wall for the conductive cable to pass through. The output end of the battery 4 is connected to the internal conductive structure of the magnetic connector 3 via a conductive cable, achieving a secure and reliable conductive connection through a plug-in connection. The outer diameter of the magnetic connector 3 has a stepped structure along the axial direction, with a larger diameter at the upper end and a smaller diameter at the lower end. An insulating coating is provided on the area outside the stepped surface to isolate non-working areas, ensuring that current is transmitted only through the stepped surface area. A magnetic induction coil is located at the stepped surface, and the conductive cable transmits electrical energy from the battery 4 to this magnetic induction coil, achieving electromagnetic coupling output of electrical energy to the outside.

[0060] Specifically, the magnetic ring 6 is a hollow circular ring structure, installed on the stepped surface of the inner hole of the outer tube 1, corresponding to the stepped surface of the magnetic connector 3. The magnetic ring 6 also has a magnetic induction coil, which forms a magnetic coupling relationship with the magnetic induction coil on the magnetic connector 3 to achieve non-contact power transmission. The magnetic ring 6 is electrically connected to the drilling measurement system or other electrical structures inside the side wall of the outer tube 1 via a conductive cable, thereby supplying the received power to the corresponding equipment.

[0061] Specifically, the sealing connector 5 is located at the top of the power supply assembly. Its right end has a male thread structure that connects to the female thread on the inner wall of the upper end of the battery tube 2. This is used to achieve a sealed encapsulation of the power supply assembly and prevent the intrusion of downhole liquid. At the same time, the upper end of the sealing connector 5 is provided with an internal hexagonal hole structure to facilitate assembly and disassembly operations using tools, thereby improving maintenance convenience.

[0062] In summary, by acquiring electrical connection impedance data before deployment and obtaining the induced voltage amplitude and phase shift during magnetic coupling transmission after deployment, phased detection of the internal connection and coupling status of the power supply unit was achieved. During drilling operations, real-time monitoring of leakage current in the external insulation area of ​​the power supply unit, combined with comparative analysis using safety thresholds, enabled dynamic evaluation of insulation performance, improving the operational safety of the power supply unit in complex downhole environments. By integrating internal connection integrity status, coupling status, and insulation performance safety assessment indicators, a multi-dimensional state vector was constructed and weighted analysis was performed to obtain a power supply health score, achieving a quantitative evaluation of the overall operational status of the power supply unit. Combining the remaining depth data of each drilling cycle and the rope retrieval window information, and incorporating the decay trend of the power supply health score, the failure probability of the power supply unit before the next retrieval cycle was predicted, enabling early identification of potential failure risks and realizing a shift from passive maintenance to predictive maintenance. The system generates power supply unit replacement instructions based on failure probability, and provides replacement times and maintenance priorities matching the retrieval window. This optimizes operation scheduling and avoids downtime or rework caused by sudden power supply unit failures. The power supply unit structure, through the coordinated design of the outer tube, magnetic ring, and deployable power supply components, can adapt to the space-constrained conditions of wireline coring drilling, enabling rapid deployment and retrieval of the power supply components. The cooperation between the magnetic connector and the magnetic ring improves the stability of energy transmission; the insulating coating enhances the insulation performance and environmental adaptability of the device, thereby improving the overall reliability and safety of the power supply unit.

[0063] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention and not to limit it. Although the present invention has been described in detail with reference to the above embodiments, those skilled in the art should understand that modifications or equivalent substitutions can still be made to the specific implementation of the present invention. Any modifications or equivalent substitutions that do not depart from the spirit and scope of the present invention should be covered within the scope of protection of the claims of the present invention.

Claims

1. A method of detecting a wireline coring drilling while drilling measurement system power supply device, characterized in that, include: Acquire electrical connection impedance data of the power supply device before deployment, and amplitude and phase offset of magnetic coupling transmission induced voltage after deployment; The internal connection integrity status is determined based on the electrical connection impedance data; the coupling docking status is determined based on the induced voltage amplitude and phase offset. During the drilling operation, the leakage current data of the external insulation area of ​​the power supply device is monitored, and the leakage current data is compared with the safety threshold to obtain the insulation performance safety assessment index. By combining the internal connection integrity status, coupling and docking status, and insulation performance safety assessment indicators, a multi-dimensional state vector is constructed to determine the power supply health score. The remaining depth data and rope retrieval window data for the current drilling cycle are obtained. Based on the decay trend of the power supply health score and the estimated operation time of the remaining depth data, the failure probability of the power supply device before the next rope retrieval window is predicted. And based on the failure probability, a power supply device replacement instruction is generated.

2. The testing method for the power supply device of the wireline coring drilling measurement-while-drilling system according to claim 1, characterized in that, When obtaining electrical connection impedance data of the power supply device before commissioning, the following are included: An AC test signal is injected into the internal connection port of the power supply device; the voltage response value and the current response value are obtained; and the electrical connection impedance data is obtained based on the ratio of the voltage response value to the current response value.

3. The method for detecting the power supply device of the wireline coring drilling measurement-while-drilling system according to claim 2, characterized in that, When determining the coupling docking state based on the induced voltage amplitude and phase offset, the following are included: The amplitude of the induced voltage is compared with the standard coupling voltage curve, and the phase offset is compared with the standard phase curve; the coupling docking status is determined based on the comparison results.

4. The method for detecting the power supply device of the wireline coring drilling measurement-while-drilling system according to claim 3, characterized in that, When comparing the leakage current data with the safety threshold, the following steps are included: Acquire downhole ambient temperature data; perform temperature compensation correction on the safety threshold based on the downhole ambient temperature data to obtain a dynamic safety threshold; compare the leakage current data with the dynamic safety threshold to obtain an insulation performance safety assessment index.

5. The method for testing the power supply device of the wireline coring drilling measurement-while-drilling system according to claim 4, characterized in that, When constructing a multi-dimensional state vector to determine the power supply health score, the following are included: Weighting coefficients are assigned to the internal connection integrity status, coupling docking status, and insulation performance safety assessment indicators; the internal connection integrity status, coupling docking status, and insulation performance safety assessment indicators are weighted and fused based on the weighting coefficients to obtain the power supply health score.

6. The method for detecting the power supply device of the wireline coring drilling measurement-while-drilling system according to claim 5, characterized in that, Obtain the power supply health score sequence for each historical drilling operation; Linear fitting is performed on the power supply health score sequence to obtain the health decay rate; the decay trend of the power supply health score is determined based on the health decay rate.

7. The method for detecting the power supply device of the wireline coring drilling measurement-while-drilling system according to claim 6, characterized in that, Obtain the average mechanical drilling rate for the current drilling cycle; based on the remaining depth data and the average mechanical drilling rate, determine the estimated operation time.

8. The method for detecting the power supply device of the wireline coring drilling measurement-while-drilling system according to claim 7, characterized in that, When predicting the probability of power supply failure before the next rope retrieval window, the following should be included: Based on the decay trend of the power supply health score, the estimated remaining lifespan required for the power supply health score to drop to the failure threshold is determined; the estimated remaining lifespan is compared with the remaining operation time before the next rope retrieval window; when the estimated remaining lifespan is less than or equal to the remaining operation time, the failure probability is determined to be at a high risk level; when the estimated remaining lifespan is greater than the remaining operation time, the failure probability is determined to be at a low risk level.

9. The method for detecting the power supply device of the wireline coring drilling measurement-while-drilling system according to claim 8, characterized in that, When generating a power supply replacement command based on the failure probability, the following are included: Determine whether the failure probability exceeds a preset risk range; if so, generate a power supply device replacement command. The power supply device replacement instruction includes a suggested replacement time window that matches the rope retrieval window data, as well as maintenance priority information.

10. A power supply device for a wireline coring drilling measurement-while-drilling system, used in a testing method for applying the power supply device for a wireline coring drilling measurement-while-drilling system as described in any one of claims 1-9, characterized in that, include: The outer tube has a hollow, thin-walled structure, and the inner hole has a stepped surface. The magnetic ring is a hollow circular ring structure and is disposed at the inner stepped surface of the outer tube. A power supply assembly, deployably disposed inside the outer tube, includes a battery cylinder, a magnetic connector, a battery, and a sealing connector. The sealing connector is located at the top of the power supply assembly. The battery cylinder has a thick-walled hollow structure, with its upper end connected to the sealing connector and its lower end connected to the magnetic connector, forming a cable channel inside for mounting conductive cables. The battery is disposed inside the battery cylinder and connected to the magnetic connector via conductive cables. The magnetic connector has a thick-walled structure with a stepped surface of varying outer diameter, and an insulating coating is provided on the surface other than the stepped surface.

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