Packer slip locking method

Abstract

The invention relates to the technical field of oil production engineering, in particular to a packer slip locking method which comprises the steps that a compression rubber sleeve expands to be tightly attached to the inner wall of a sleeve to form an initial sealing layer; the initial setting process is monitored in real time to obtain a first setting parameter, and whether the sealing performance of the initial sealing layer is qualified or not is determined according to the analysis result of the first setting parameter; on the basis that secondary setting is not started, the slip is locked, and the locking process is monitored in real time, so that whether the slip generates a setting action in the initial setting process or not is determined; based on the fact that the sealing performance of the initial sealing layer is qualified and no abnormity exists in the locking process, a secondary setting mode is started, and secondary setting is conducted according to the secondary setting mode to form a final sealing layer; the secondary setting process is monitored in real time to obtain a second setting parameter, and whether the sealing performance of the final sealing layer is qualified or not is determined according to the analysis result of the second setting parameter; and on the basis that the secondary setting process is qualified, it is determined that overall sealing of the packer is completed.

Description

Technical Field

[0001] The invention relates to the technical field of oil production engineering, in particular to a packer slip locking method. Background Art

[0002] With the continuous development of new energy sources such as deep tight gas, hot dry rock, and low-maturity shale oil conversion, it is necessary to insert a packer downhole to isolate the reservoir. However, due to the very complex downhole working conditions, higher requirements are placed on the sealing performance of the packer under high temperature and high pressure conditions. The commonly used slip packers usually achieve the overall sealing of the packer by controlling the slip rupture force or the sealing pin force. During the sealing, due to the limitations of materials and processing technology, the slips of the packers suitable for high temperature and high pressure wells are easy to be anchored on the casing in advance, resulting in poor sealing effect of the packer, which affects the overall sealing effect of the packer.

[0003] Chinese patent application publication number CN205445541U discloses a drillable packer for integrated construction of deep gas well fracturing and production, which consists of an upper joint, an O-ring, an anti-rotation pin, an upper center pipe, a T-ring, a spacer ring, a middle joint, a working tube, a lower center pipe, an upper slip, an upper cone, a sealing pin, a protective umbrella, an aluminum ring, a side rubber tube, a middle rubber tube, a liner ring, a lower cone, a lower slip, a locking ring, a piston, a jacket, and a lower joint; wherein the upper joint is threadedly connected to the upper end of the upper center pipe, the upper joint is fixedly connected to the upper center pipe by an anti-rotation pin, and is sealed with the upper center pipe by an O-ring; the T-ring and the spacer ring are installed in an annular groove formed by the upper center pipe and the middle joint; the upper center pipe is threadedly connected to the middle joint, and is sealed with the working tube by a T-ring; the middle joint is inserted in the lower center pipe, and is sealed by The O-ring is sealed with the lower center tube; the working tube is threadedly connected to the upper end of the lower center tube, the upper cava is stuck at the lower end of the working tube, the upper cone is sleeved on the outside of the lower center tube, and is fixed to the lower center tube by a sealing pin; the aluminum ring is embedded in the slot of the side rubber tube, the protective umbrella, aluminum ring, side rubber tube, and middle rubber tube are sleeved on the lower center tube, and the liner ring is fixed in the trapezoidal groove of the middle rubber tube; the lower cone is sleeved on the lower center tube and fixed on the lower center tube by a sealing pin, the lower cava is sleeved on the lower center tube, and is connected to the lower cone by an inclined surface; a locking ring is installed between the piston and the lower center tube, the piston is connected to the lower center tube through the locking ring, and is sealed inside and outside the lower center tube and the outer sleeve by an O-ring; the outer sleeve is fixed to the groove of the piston by a sealing pin, the outer sleeve is threadedly connected to the lower joint, and is sealed to the lower joint by an O-ring; the lower joint is threadedly connected to the lower end of the lower center tube.

[0004] It can be seen that the current packer cannot guarantee the overall sealing effect. Summary of the invention

[0005] Therefore, an object of the present invention is to provide a packer slip locking method for overcoming the problem that the current packer cannot ensure the overall sealing effect.

[0006] To achieve the above object, the present invention provides a packer slip locking method, comprising: The driving cylinder compresses the rubber tube, so that the rubber tube expands and fits tightly against the inner wall of the casing to achieve the initial setting of the packer, thereby forming an initial sealing layer; Real-time monitoring of the initial setting process is performed to obtain a first setting parameter, and whether the sealing performance of the initial sealing layer is qualified is determined according to the analysis result of the first setting parameter; Based on the fact that the secondary setting has not started, the slips are locked, and the locking process is monitored in real time, and it is determined whether the slips have generated a setting action during the initial setting process according to the monitoring result; Based on the qualified sealing performance of the initial sealing layer and the normal locking process, the secondary setting mode is started, and the slips are driven to open according to the secondary setting mode to achieve the secondary setting of the packer, thereby forming a final sealing layer; Real-time monitoring of the secondary setting process is performed to obtain a second setting parameter, and whether the sealing performance of the final sealing layer is qualified is determined according to an analysis result of the second setting parameter; Based on the fact that the secondary setting process is qualified, it is determined that the overall sealing of the packer is completed.

[0007] Furthermore, the process of real-time monitoring the preliminary setting process to obtain the first setting parameter includes: Performing real-time monitoring of the temperature in the preliminary setting process according to a preset primary monitoring cycle to obtain each primary temperature parameter; Performing real-time monitoring of the pressure in the preliminary setting process according to the primary monitoring cycle to obtain each primary pressure parameter; Performing real-time monitoring of the wellhead pressure according to the one monitoring cycle to obtain back pressure parameters of each wellhead; Wherein, the first setting parameter includes: the primary temperature parameter, the primary pressure parameter and the wellhead back pressure parameter.

[0008] Further, the process of determining whether the sealing performance of the initial sealing layer is qualified according to the analysis result of the first setting parameter includes: Generate a primary temperature curve according to each primary temperature parameter, generate a primary pressure curve according to each primary pressure parameter, and generate a wellhead back pressure curve according to each wellhead back pressure parameter; Analyzing the primary temperature curve, the primary pressure curve and the wellhead back pressure curve in sequence to determine whether each curve meets a single determination condition; Whether the sealing performance of the initial sealing layer is qualified is determined according to the number of items that meet the single determination condition.

[0009] Furthermore, the process of sequentially analyzing the primary temperature curve, the primary pressure curve and the wellhead back pressure curve to determine whether each curve meets a single determination condition includes: For the primary temperature curve, identifying temperature abnormality points in the primary temperature curve, and obtaining the number of temperature abnormality points, and judging whether the primary temperature curve meets the single determination condition according to the number of temperature abnormality points combined with the first temperature end parameter; For the primary pressure curve, identifying abnormal pressure points in the primary pressure curve, obtaining the number of abnormal pressure points, and judging whether the primary pressure curve meets the single determination condition according to the number of abnormal pressure points combined with the first pressure end parameter; For the wellhead backpressure curve, identify abnormal backpressure points in the wellhead backpressure curve, obtain the number of abnormal backpressure points, and determine whether the wellhead backpressure curve meets the single determination condition based on the number of abnormal backpressure points combined with the first backpressure end parameter; Among them, when the rubber sleeve is tightly attached to the inner wall of the casing, a temperature parameter in the initial sealing layer is obtained and recorded as the first temperature end parameter, a pressure parameter in the initial sealing layer is obtained and recorded as the first pressure end parameter, and a wellhead back pressure parameter in the initial sealing layer is obtained and recorded as the first back pressure end parameter.

[0010] Furthermore, the process of identifying the temperature abnormality point in the primary temperature curve includes: For any set of adjacent primary temperature parameters, it includes: the previous temperature parameter and the next temperature parameter; Calculating a first difference absolute value according to the previous temperature parameter combined with the next temperature parameter, and judging whether the group of adjacent primary temperature parameters is the temperature abnormality point according to the first difference absolute value combined with a preset first evaluation value; Wherein, based on the absolute value of the first difference being less than or equal to the first evaluation value, it is determined that the group of adjacent primary temperature parameters is the temperature abnormality point; based on the absolute value of the first difference being greater than the first evaluation value, it is determined that the group of adjacent primary temperature parameters is not the temperature abnormality point; The process of identifying the abnormal pressure point in the primary pressure curve includes: For any set of adjacent primary pressure parameters, it includes: the previous pressure parameter and the next pressure parameter; Calculating a second difference absolute value according to the previous pressure parameter combined with the next pressure parameter, and judging whether the group of adjacent primary pressure parameters is the pressure abnormality point according to the second difference absolute value combined with a preset second evaluation value; Wherein, based on the absolute value of the second difference being less than or equal to the second evaluation value, it is determined that the group of adjacent primary pressure parameters is the pressure abnormality point; based on the absolute value of the second difference being greater than the second evaluation value, it is determined that the group of adjacent primary pressure parameters is not the pressure abnormality point; The process of identifying abnormal back pressure points in the wellhead back pressure curve includes: For any group of adjacent wellhead back pressure parameters, it includes: the front wellhead back pressure parameter and the rear wellhead back pressure parameter; Calculating a third difference absolute value according to the front wellhead back pressure parameter combined with the rear wellhead back pressure parameter, and judging whether the group of adjacent wellhead back pressure parameters is the back pressure abnormal point according to the third difference absolute value combined with a preset third evaluation value; Among them, based on the absolute value of the third difference being less than or equal to the third evaluation value, it is determined that the back pressure parameters of this group of adjacent wellheads are the back pressure abnormality points; based on the absolute value of the third difference being greater than the third evaluation value, it is determined that the back pressure parameters of this group of adjacent wellheads are not the back pressure abnormality points.

[0011] Furthermore, the process of judging whether each curve meets the single judgment condition includes: For any curve, obtain the stable maintenance time of the end parameter on the curve; Determining whether the end parameter meets the stability requirement according to the stability maintenance time and a preset standard maintenance time; Based on the stability maintenance time being longer than the standard maintenance time, determining that the end parameter meets the stability requirement; Based on the fact that the end parameter meets the stability requirement and the number of abnormal points corresponding to the curve is less than or equal to 1, it is determined that the curve meets the single determination condition.

[0012] Furthermore, the process of determining whether the sealing performance of the initial sealing layer is qualified according to the number of items that meet the single determination condition includes: When the number of items that meet the single determination condition among the primary temperature curve, the primary pressure curve and the wellhead back pressure curve is 3, it is determined that the sealing performance of the initial sealing layer is qualified; When the number of the items that meet the single determination condition among the primary temperature curve, the primary pressure curve and the wellhead back pressure curve is less than 3, it is determined that the sealing performance of the initial sealing layer is unqualified.

[0013] Furthermore, the process of real-time monitoring the locking process and determining whether the slip generates a setting action during the initial setting process according to the monitoring result includes: Obtaining actual locking stress of the slips; Acquiring actual monitoring images of the slips and locking components; Determining whether the locking state of the slip is qualified according to the actual locking stress and the preset standard locking stress; Recognize the actual monitoring image, and determine whether the locking position of the slip is qualified according to the recognition result; Based on the fact that both the locking state and the locking position are qualified, it is determined that the slip has not produced a setting action during the initial setting process.

[0014] Furthermore, based on the qualified sealing performance of the initial sealing layer and the normal locking process, the process of starting the secondary setting mode includes: Shearing off the locking member that locks the slip; Acquiring an acoustic wave signal during the shearing process, and analyzing the acoustic wave signal to obtain acoustic wave characteristic parameters; determining whether the locking component has been cut off according to the acoustic wave characteristic parameters; The acoustic wave characteristic parameters include: transmission duration, transmission frequency and transmission intensity.

[0015] Furthermore, the process of real-time monitoring the secondary setting process to obtain the second setting parameters, and determining whether the sealing performance of the final sealing layer is qualified according to the analysis results of the second setting parameters includes: Real-time monitoring of the temperature and pressure in the secondary setting process is performed according to a preset secondary monitoring cycle to obtain various secondary temperature parameters and various secondary pressure parameters; measuring various real-time displacement parameters between the packer and the well wall in real time according to the secondary monitoring cycle; Generate corresponding curves based on each secondary temperature parameter, each secondary pressure parameter and each real-time displacement parameter; Identify the number of abnormal points in each curve and the duration of the end parameter maintenance, and determine whether the sealing performance of the final sealing layer is qualified according to the number of abnormal points and the duration of maintenance; Wherein, the second setting parameter includes: the secondary temperature parameter, the secondary pressure parameter and the real-time displacement parameter.

[0016] Compared with the prior art, the beneficial effects of the present invention are that, through the two stages of initial sealing and secondary sealing, the reliability and stability of the sealing layer of the packer are ensured; the formation of the initial sealing layer and the strengthening of the final sealing layer greatly reduce the risk of leakage; real-time monitoring of the temperature, pressure and displacement parameters during the sealing process enables the operator to understand the status of the packer in time and make rapid responses based on real-time data, thereby improving the safety and efficiency of the operation; by analyzing the sealing parameter curve, any abnormal points or trends can be identified early, so that corrective measures can be taken before the problem worsens, avoiding possible production accidents and economic losses; by real-time monitoring of the locking process of the cava, it is ensured that the cava will not produce a sealing action during the initial sealing process, thereby ensuring the accuracy and controllability of the sealing; reducing operational risks and improving the success rate of the packer sealing; through precise monitoring and control, the reliability and efficiency of the packer sealing are improved, the operational risks are reduced, and the safe production level of oil and gas wells is improved.

[0017] It can avoid the situation that the packer rubber cylinder is not completely sealed and the slip is sealed in advance, and can effectively ensure the sealing performance of the packer is intact; the locking mechanism formed by the slip, shear sleeve, slip hanger, and locking pin can ensure that the slip of the packer is locked during the sealing process and no sealing action occurs, providing upward space for the packer rubber cylinder, ensuring that the hydraulic sealing force of the packer acts completely on the rubber cylinder, so that the packer can realize the asynchronous sealing method of first sealing the rubber cylinder and then sealing the slip, ensuring that both the rubber cylinder and the slip are completely sealed. In the prior art, since there is no design of the slip locking mechanism, the sealing method of the rubber cylinder and the slip is used to seal synchronously, which is easy to happen that the slip is anchored on the pipe sleeve in advance to complete the sealing when the rubber cylinder has not been completely sealed, which reduces the overall sealing performance of the packer.

[0018] By real-time monitoring of the temperature, pressure and wellhead back pressure during the initial setting process, the accuracy and real-time nature of the setting parameters are ensured; real-time monitoring helps to promptly detect any abnormalities in the setting process so that corrective measures can be taken quickly; by generating temperature, pressure and wellhead back pressure curves, operators can obtain intuitive data display, which is convenient for analyzing and understanding the setting process; curve analysis helps to identify parameter change trends and predict potential problems; through a single preset judgment condition, the judgment process can be standardized to reduce human errors; each parameter curve is analyzed separately to ensure the comprehensiveness and systematicness of the evaluation; by analyzing whether each curve meets the judgment condition, the initial sealing can be evaluated. The sealing of the layer ensures the reliability of the seal; if the sealing is unqualified, the sealing process can be adjusted in time to reduce the operational risk caused by sealing failure; through real-time monitoring and data analysis, the safety and reliability of the sealing process of the packer are improved; rapid identification and resolution of problems reduce operational interruption time and improve overall operational efficiency; through precise data analysis and judgment, the quality of the packer sealing is ensured to meet the high standards of oil and gas wells; data-based decision support is provided, enabling operators to make more reasonable operational decisions based on accurate information; the recorded and analyzed data can be used for quality control and quality assurance, providing reference and improvement basis for subsequent operations.

[0019] By analyzing the primary temperature curve, primary pressure curve and wellhead back pressure curve in detail in turn, the sealing performance of the initial sealing layer can be comprehensively evaluated, not only considering the two key parameters of temperature and pressure, but also adding the important indicator of wellhead back pressure, thereby improving the accuracy and comprehensiveness of the evaluation; by setting specific judgment conditions and evaluation values, automatic recognition and judgment of curve data are realized; manual intervention is reduced, the efficiency and accuracy of analysis are improved, and errors that may be caused by human factors are also reduced; the setting of evaluation values ​​and standard maintenance time can be adjusted according to actual well conditions, which makes this method more flexible and adaptable; due to differences in geological conditions, well depth, well temperature and other factors, different oil and gas wells have different ranges of variation in temperature, pressure and wellhead back pressure, so by adjusting these parameters, different well conditions can be evaluated more accurately. Sealing performance of the initial sealing layer; provides clear judgment criteria and procedures for the evaluation of the sealing performance of the initial sealing layer; by identifying abnormal points, calculating the absolute value of the difference, combining the evaluation value judgment, determining the stable maintenance time and other steps, it can systematically evaluate the compliance of each curve, and judge whether the sealing of the initial sealing layer is qualified; standardized evaluation process helps to improve the consistency and reliability of the evaluation; in the actual production process of oil and gas wells, timely discovery and resolution of sealing layer failure problems are crucial to ensuring production safety and stability; through real-time analysis of changes in parameters such as temperature, pressure and wellhead back pressure, potential sealing problems can be discovered in time, and corresponding measures can be taken to deal with them, thereby avoiding further expansion and deterioration of the problem; a comprehensive, accurate, intelligent and efficient evaluation of sealing performance is achieved, which is of great significance to ensuring the production safety and stability of oil and gas wells.

[0020] By real-time monitoring and analysis of the actual locking stress of the slips, the sealing process can be precisely controlled to ensure the accuracy and reliability of the locking state of the slips; by identifying and evaluating the actual monitoring images, any abnormalities can be discovered early in the sealing process, so that timely measures can be taken to avoid potential problems; by comprehensively analyzing the actual locking stress and image recognition results, the locking state of the slips can be fully evaluated to ensure the quality and reliability of the locking; by real-time monitoring of the locking stress and locking position of the slips, it can be discovered in time whether there are any abnormalities in the initial sealing process of the slips, such as insufficient locking force or locking position deviation, so as to avoid sealing failure or equipment damage caused by improper locking of the slips, thereby improving the safety of oil and gas well operations; by setting standard locking stress and stress evaluation values, a clear judgment is provided for the locking state of the slips. The locking state of the slip is qualified only when the difference between the actual locking stress and the standard locking stress is within the allowable range. The quantitative evaluation method enhances the reliability of the evaluation results and reduces the subjectivity of human judgment. Real-time monitoring and rapid judgment of the locking state of the slip can shorten the debugging time of the initial setting process and improve the operation efficiency. Once the locking state of the slip is found to be unqualified, measures can be taken immediately to adjust it, avoiding subsequent shutdowns and rework caused by locking problems. Potential problems can be discovered and prevented in time. For example, if the slip does not produce a setting action during the initial setting process, it may be due to a failure of the locking component or improper operation. Timely discovery and handling of these problems can avoid subsequent greater losses and risks, providing a strong guarantee for the smooth production and maintenance of oil and gas wells.

[0021] Through non-contact acoustic wave monitoring means, the acoustic wave signals generated during the cutting process can be captured and analyzed in real time without directly interfering with the cutting operation; the safety risks that may be brought about by traditional contact monitoring, such as mechanical collision, electrical interference, etc., are avoided, thereby improving the safety of the overall operation; using highly sensitive acoustic wave sensors or microphone arrays, the weak acoustic wave signals generated during the cutting process can be accurately captured, and key acoustic wave characteristic parameters can be extracted through in-depth analysis; the execution of the cutting operation and the status of the locking components can be accurately reflected, thereby improving the accuracy and reliability of monitoring; the acoustic wave signals are analyzed in real time during the cutting process, and based on the comparison results of the acoustic wave characteristic parameters with the preset conditions, feedback can be given immediately on whether the locking components are successfully cut; the instant feedback mechanism helps the operator to promptly understand the results of the cutting operation and make the next decision accordingly The system can make a one-step operational decision, thereby improving work efficiency and response speed; by comparing the actually measured acoustic wave characteristic parameters with the standard characteristic parameters under the ideal mode, the shearing state of the locking component can be determined more accurately. The comparison method based on quantitative parameters reduces the subjectivity and uncertainty of human judgment, reduces the misjudgment rate, and improves the accuracy of judgment; the entire monitoring and judgment process relies on advanced acoustic wave sensing technology and data analysis algorithms, which realizes the automatic monitoring and intelligent judgment of the shearing operation, which not only improves the automation degree of the sealing, but also enhances its intelligence level, providing strong support for the intelligent management of oil and gas well operations; by real-time monitoring and judging the shearing state of the locking component, the opening time of the secondary sealing mode can be accurately controlled, which helps to optimize the operation process, reduce unnecessary waiting time and repeated operations, and improve the overall operation efficiency.

[0022] By real-time monitoring and recording of key parameters such as temperature, pressure and displacement during the secondary sealing process, and generating corresponding curve graphs based on these parameters, the dynamic changes in the sealing process can be fully and meticulously captured; comprehensive data collection and analysis methods make the evaluation of the sealing performance of the final sealing layer more accurate and reliable; the preset secondary monitoring cycle ensures that any abnormal changes in the sealing process can be captured in a timely manner; real-time and dynamic monitoring enables operators to respond to and deal with potential problems quickly, thereby avoiding poor formation of the sealing layer or poor sealing performance; by counting the number of abnormal points in the curve graph and calculating the duration of key parameters within the preset stable range, quantitative indicators are provided for the evaluation of sealing performance; the evaluation results are more objective and comparable, and it is also convenient for operators to evaluate according to specific The real-time monitoring and comprehensive evaluation process enables operators to understand the status and results of the sealing process in a timely manner, so as to adjust the operation process or take necessary remedial measures according to the evaluation results; the instant feedback mechanism helps to reduce unnecessary waiting time and repeated operations, and improves the overall operation efficiency; by comprehensively evaluating the sealing performance of the final sealing layer, the safety and reliability of the oil and gas wells in the subsequent production process can be ensured; the sealing layer with good sealing performance can effectively prevent the leakage of fluid in the wellbore and the invasion of formation fluid, so as to ensure the normal production of oil and gas wells and the safety of operators; the real-time monitoring and evaluation process relies on advanced sensor technology and data analysis algorithms to realize the automatic monitoring and intelligent evaluation of the sealing process, and provides strong support for the intelligent management of oil and gas well operations. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] Figure 1 It is a schematic flow chart of a packer slip locking method according to an embodiment of the present invention; Figure 2 It is a structural schematic diagram of a packer slip locking mechanism according to an embodiment of the present invention; Figure 3 It is a first flow chart of the initial setting in the packer slip locking method according to an embodiment of the present invention; Figure 4 A second flow chart of the initial setting of the packer slip locking method according to an embodiment of the present invention; The figure includes: 1-cone, 2-sealing pin, 3-slip, 4-shear sleeve, 5-slip hanger, 6-locking pin, 7-center pipe. DETAILED DESCRIPTION

[0024] In order to make the objects and advantages of the present invention more clearly understood, the present invention is further described below in conjunction with embodiments; it should be understood that the specific embodiments described herein are only used to explain the present invention and are not used to limit the present invention.

[0025] The preferred embodiments of the present invention are described below with reference to the accompanying drawings. It should be understood by those skilled in the art that these embodiments are only used to explain the technical principles of the present invention and are not intended to limit the protection scope of the present invention.

[0026] It should be noted that, in the description of the present invention, terms such as "up", "down", "left", "right", "inside" and "outside" indicating directions or positional relationships are based on the directions or positional relationships shown in the drawings. This is merely for the convenience of description and does not indicate or imply that the device or element must have a specific orientation, be constructed and operated in a specific orientation. Therefore, it cannot be understood as a limitation on the present invention.

[0027] See also Figure 1 As shown, this embodiment provides a packer slip locking method, comprising: Step S100, driving the cylinder to compress the rubber cylinder, so that the rubber cylinder expands and fits tightly against the inner wall of the casing to achieve initial setting of the packer, thereby forming an initial sealing layer; Step S200, real-time monitoring of the preliminary setting process to obtain a first setting parameter, and determining whether the sealing performance of the initial sealing layer is qualified according to the analysis result of the first setting parameter; Step S300, based on the fact that the secondary setting has not started, locking the slips, and monitoring the locking process in real time, and determining whether the slips have generated a setting action during the initial setting process according to the monitoring result; Step S400, based on the qualified sealing performance of the initial sealing layer and the normal locking process, starting the secondary setting mode, driving the slips to open according to the secondary setting mode to achieve the secondary setting of the packer, thereby forming a final sealing layer; Step S500, real-time monitoring of the secondary setting process to obtain a second setting parameter, and determining whether the sealing performance of the final sealing layer is qualified according to the analysis result of the second setting parameter; Step S600: Based on the secondary setting process being qualified, it is determined that the overall sealing of the packer is completed.

[0028] Specifically, the embodiment of the present invention ensures the reliability and stability of the sealing layer of the packer through the two stages of initial sealing and secondary sealing; the formation of the initial sealing layer and the strengthening of the final sealing layer greatly reduce the risk of leakage; real-time monitoring of temperature, pressure and displacement parameters during the sealing process enables operators to understand the status of the packer in time and respond quickly according to real-time data, thereby improving the safety and efficiency of operations; by analyzing the sealing parameter curve, any abnormal points or trends can be identified early, so that corrective measures can be taken before the problem worsens, avoiding possible production accidents and economic losses; by real-time monitoring of the locking process of the cava, it is ensured that the cava will not produce a sealing action during the initial sealing process, thereby ensuring the accuracy and controllability of the sealing; reducing operational risks and improving the success rate of the packer sealing; through precise monitoring and control, the reliability and efficiency of the packer sealing are improved, the operational risks are reduced, and the safe production level of oil and gas wells is improved.

[0029] See also Figure 2 As shown, it is a schematic diagram of the structure of the packer slip locking mechanism; wherein, the packer slip locking mechanism is composed of a cone 1, a setting pin 2, a slip 3, a shear sleeve 4, a slip hanger 5, and a locking pin 6; The cone 1 is connected to the central tube 7 through the setting pin 2, the shear sleeve 4 is connected to the slip hanger 5 through the locking pin 6, the slip 3 is hooked on the slip hanger 5, the slip 3 is sleeved on the central tube 7, and connected to the cone 1 by means of an inclined surface; In this embodiment, when the packer is set, the rubber sleeve is compressed by the cylinder body, and then the cava 3, the shear sleeve 4, and the cava hanger 5 are pushed upward. When the setting force reaches the design value of the complete compression of the rubber sleeve, the locking pin 6 is cut off, and the cava 3 radially opens and bites the casing under the action of the cone 1. The cava 3 is locked into the setting state. At this time, the packer rubber sleeve has been completely set, and the overall setting of the packer is completed.

[0030] Specifically, the embodiment of the present invention can avoid the situation where the packer rubber cylinder is not completely sealed and the slips are sealed in advance, and can effectively ensure the sealing performance of the packer is intact; the locking mechanism formed by the slips, shear sleeves, slip hangers, and locking pins can ensure that the slips of the packer are locked during the sealing process and no sealing action occurs, providing upward space for the packer rubber cylinder, ensuring that the hydraulic sealing force of the packer acts completely on the rubber cylinder, so that the packer can achieve an asynchronous sealing method of first sealing the rubber cylinder and then sealing the slips, ensuring that both the rubber cylinder and the slips are completely sealed. In the prior art, since there is no design of a slip locking mechanism, a sealing method in which the rubber cylinder and the slips are synchronously sealed is adopted, which easily leads to the slips being anchored on the pipe sleeve in advance to complete the sealing when the rubber cylinder has not been completely sealed, thereby reducing the overall sealing performance of the packer.

[0031] See also Figure 3 As shown, it is a first flow chart of preliminary setting, wherein the process of real-time monitoring of the preliminary setting process to obtain the first setting parameters includes: Step S211, monitoring the temperature in the preliminary setting process in real time according to a preset primary monitoring cycle to obtain each primary temperature parameter; Step S212, monitoring the pressure in the preliminary setting process in real time according to the primary monitoring cycle to obtain each primary pressure parameter; Step S213, monitoring the pressure at the wellhead in real time according to the one monitoring cycle to obtain back pressure parameters of each wellhead; Wherein, the first setting parameter includes: the primary temperature parameter, the primary pressure parameter and the wellhead back pressure parameter.

[0032] See also Figure 4 As shown, it is a second flow chart of preliminary setting, wherein the process of determining whether the sealing performance of the initial sealing layer is qualified according to the analysis result of the first setting parameter includes: Step S221, generating a primary temperature curve according to each primary temperature parameter, generating a primary pressure curve according to each primary pressure parameter, and generating a wellhead back pressure curve according to each wellhead back pressure parameter; Step S222, analyzing the primary temperature curve, the primary pressure curve and the wellhead back pressure curve in sequence to determine whether each curve meets a single determination condition; Step S223, determining whether the sealing performance of the initial sealing layer is qualified according to the number of items that meet the single determination condition.

[0033] The monitoring cycle described in this embodiment is set to one tenth of the total duration of the initial sealing.

[0034] Specifically, the embodiment of the present invention ensures the accuracy and real-time performance of the setting parameters by real-time monitoring of the temperature, pressure and wellhead back pressure during the initial setting process; real-time monitoring helps to promptly detect any abnormalities in the setting process so that corrective measures can be taken quickly; by generating temperature, pressure and wellhead back pressure curves, operators can obtain intuitive data display, which is convenient for analyzing and understanding the setting process; curve analysis helps to identify the changing trend of parameters and predict potential problems; through a preset single judgment condition, the judgment process can be standardized to reduce human errors; each parameter curve is analyzed separately to ensure the comprehensiveness and systematicness of the evaluation; by analyzing whether each curve meets the judgment condition, Evaluate the sealing performance of the initial sealing layer to ensure the reliability of the seal; if the sealing performance is unqualified, adjust the sealing process in time to reduce the operational risk caused by sealing failure; improve the safety and reliability of the packer sealing process through real-time monitoring and data analysis; quickly identify and solve problems, reduce operation interruption time, and improve overall operation efficiency; ensure the quality of the packer sealing through precise data analysis and judgment, and meet the high standards of oil and gas wells; provide data-based decision support, so that operators can make more reasonable operational decisions based on accurate information; the recorded and analyzed data can be used for quality control and quality assurance, providing reference and improvement basis for subsequent operations.

[0035] Specifically, the process of analyzing the primary temperature curve, the primary pressure curve, and the wellhead back pressure curve in sequence to determine whether each curve meets a single determination condition in this embodiment includes: For the primary temperature curve, identifying temperature abnormality points in the primary temperature curve, and obtaining the number of temperature abnormality points, and judging whether the primary temperature curve meets the single determination condition according to the number of temperature abnormality points combined with the first temperature end parameter; For the primary pressure curve, identifying abnormal pressure points in the primary pressure curve, obtaining the number of abnormal pressure points, and judging whether the primary pressure curve meets the single determination condition according to the number of abnormal pressure points combined with the first pressure end parameter; For the wellhead backpressure curve, identify abnormal backpressure points in the wellhead backpressure curve, obtain the number of abnormal backpressure points, and determine whether the wellhead backpressure curve meets the single determination condition based on the number of abnormal backpressure points combined with the first backpressure end parameter; Wherein, when the rubber sleeve is in close contact with the inner wall of the casing, a temperature parameter in the initial sealing layer is obtained and recorded as the first temperature end parameter, a pressure parameter in the initial sealing layer is obtained and recorded as the first pressure end parameter, and a wellhead back pressure parameter in the initial sealing layer is obtained and recorded as the first back pressure end parameter; The process of identifying abnormal temperature points in a primary temperature curve includes: For any set of adjacent primary temperature parameters, it includes: the previous temperature parameter and the next temperature parameter; Calculating a first difference absolute value according to the previous temperature parameter combined with the next temperature parameter, and judging whether the group of adjacent primary temperature parameters is the temperature abnormality point according to the first difference absolute value combined with a preset first evaluation value; The absolute value of the first difference=|previous temperature parameter-later temperature parameter|; Wherein, based on the absolute value of the first difference being less than or equal to the first evaluation value, it is determined that the group of adjacent primary temperature parameters is the temperature abnormality point; based on the absolute value of the first difference being greater than the first evaluation value, it is determined that the group of adjacent primary temperature parameters is not the temperature abnormality point; In this embodiment, the first evaluation value is set to 10, and the first evaluation value is used to measure the value of the temperature rise or fall in a monitoring cycle under normal circumstances; the specific setting is also affected by the actual well conditions; The process of identifying the abnormal pressure point in the primary pressure curve includes: For any set of adjacent primary pressure parameters, it includes: the previous pressure parameter and the next pressure parameter; Calculating a second difference absolute value according to the previous pressure parameter combined with the next pressure parameter, and judging whether the group of adjacent primary pressure parameters is the pressure abnormality point according to the second difference absolute value combined with a preset second evaluation value; The absolute value of the second difference=|previous pressure parameter-later pressure parameter|; In this embodiment, the second evaluation value is set to 35, and the second evaluation value is used to measure the value of pressure increase or decrease in a monitoring cycle under normal circumstances; the specific setting is also affected by the actual well conditions; Wherein, based on the absolute value of the second difference being less than or equal to the second evaluation value, it is determined that the group of adjacent primary pressure parameters is the pressure abnormality point; based on the absolute value of the second difference being greater than the second evaluation value, it is determined that the group of adjacent primary pressure parameters is not the pressure abnormality point; The process of identifying abnormal back pressure points in the wellhead back pressure curve includes: For any group of adjacent wellhead back pressure parameters, it includes: the front wellhead back pressure parameter and the rear wellhead back pressure parameter; Calculating a third difference absolute value according to the front wellhead back pressure parameter combined with the rear wellhead back pressure parameter, and judging whether the group of adjacent wellhead back pressure parameters is the back pressure abnormal point according to the third difference absolute value combined with a preset third evaluation value; The absolute value of the third difference=|front wellhead back pressure parameter−rear wellhead back pressure parameter|; In this embodiment, the third evaluation value is set to 30-40; the third evaluation value is used to measure the value of the wellhead back pressure increase or decrease in a monitoring cycle under normal circumstances; the specific setting is also affected by the actual well conditions; Wherein, based on the absolute value of the third difference being less than or equal to the third evaluation value, it is determined that the back pressure parameters of the group of adjacent wellheads are the back pressure abnormal point; based on the absolute value of the third difference being greater than the third evaluation value, it is determined that the back pressure parameters of the group of adjacent wellheads are not the back pressure abnormal point; The process of judging whether each curve meets the single judgment condition includes: For any curve, for example: primary pressure curve; Obtaining a stable maintenance time of the first temperature end parameter on the primary pressure curve; Determining whether the first temperature end parameter meets the stability requirement according to the stability maintenance time and a preset standard maintenance time; Based on the fact that the stability maintenance time is longer than the standard maintenance time, it is determined that the first temperature end parameter meets the stability requirement; Based on the fact that the stability maintenance time is less than or equal to the standard maintenance time, determining that the first temperature end parameter does not meet the stability requirement; In this embodiment, the standard maintenance time is set to two tenths of the total time of the initial setting; For any end parameter, for example: the first temperature end parameter; Based on the fact that the first temperature end parameter meets the stability requirement and the number of temperature abnormality points corresponding to the primary pressure curve is less than or equal to 1, it is determined that the primary pressure curve meets the single determination condition; If the first temperature end parameter does not meet the stability requirement, determining that the primary pressure curve does not meet the single determination condition; If the number of temperature anomaly points corresponding to the primary pressure curve is greater than 1, it is determined that the primary pressure curve does not meet the single determination condition; The process of determining whether the sealing performance of the initial sealing layer is qualified according to the number of items that meet the single determination condition includes: When the number of items that meet the single determination condition among the primary temperature curve, the primary pressure curve and the wellhead back pressure curve is 3, it is determined that the sealing performance of the initial sealing layer is qualified; When the number of the items that meet the single determination condition among the primary temperature curve, the primary pressure curve and the wellhead back pressure curve is less than 3, it is determined that the sealing performance of the initial sealing layer is unqualified.

[0036] Specifically, the embodiment of the present invention can comprehensively evaluate the sealing performance of the initial sealing layer by successively analyzing the primary temperature curve, the primary pressure curve and the wellhead back pressure curve in detail, and not only considers the two key parameters of temperature and pressure, but also adds the important indicator of wellhead back pressure, thereby improving the accuracy and comprehensiveness of the evaluation; by setting specific judgment conditions and evaluation values, automatic recognition and judgment of curve data are realized; human intervention is reduced, the efficiency and accuracy of the analysis are improved, and the errors that may be caused by human factors are also reduced; the setting of the evaluation value and the standard maintenance time can be adjusted according to the actual well conditions, which makes the method more flexible and adaptable; due to differences in geological conditions, well depth, well temperature and other factors, the variation ranges of temperature, pressure and wellhead back pressure of different oil and gas wells will also be different, so by adjusting these parameters, a more accurate evaluation can be made. The sealing performance of the initial sealing layer under different well conditions; provides clear judgment standards and processes for the evaluation of the sealing performance of the initial sealing layer; through the steps of identifying abnormal points, calculating the absolute value of the difference, combining the evaluation value judgment, and determining the stable maintenance time, the compliance of each curve can be systematically evaluated, and the sealing of the initial sealing layer can be judged accordingly; the standardized evaluation process helps to improve the consistency and reliability of the evaluation; in the actual production process of oil and gas wells, timely discovery and resolution of sealing layer failure problems are crucial to ensuring production safety and stability; through real-time analysis of changes in parameters such as temperature, pressure and wellhead back pressure, potential sealing problems can be discovered in time, and corresponding measures can be taken to deal with them, thereby avoiding further expansion and deterioration of the problem; a comprehensive, accurate, intelligent and efficient evaluation of sealing performance is achieved, which is of great significance to ensuring the production safety and stability of oil and gas wells.

[0037] Specifically, the process of real-time monitoring of the locking process in this embodiment and determining whether the slips generate a setting action during the initial setting process according to the monitoring result includes: Step S310, obtaining the actual locking stress of the slips; Step S320, obtaining actual monitoring images of the slips and locking components; Step S330, determining whether the locking state of the slip is qualified according to the actual locking stress and the preset standard locking stress; Step S340, identifying the actual monitoring image, and determining whether the locking position of the slip is qualified according to the identification result; Step S350: Based on the fact that both the locking state and the locking position are qualified, it is determined that the slip has not generated a setting action during the initial setting process.

[0038] wherein the absolute value of the stress difference between the actual locking stress and the standard locking stress is calculated; The absolute value of the stress difference=|actual locking stress-standard locking stress|; Judging whether the locking state of the slip is qualified according to the absolute value of the stress difference combined with a preset stress evaluation value; If the absolute value of the stress difference is less than or equal to the stress evaluation value, it is determined that the locking state is qualified; If the absolute value of the stress difference is greater than the stress evaluation value, the locking state is determined to be unqualified; In this embodiment, the standard locking stress is the target value that can be locked between the cava and the locking component, representing the minimum locking force that the cava should achieve during the setting process; and is determined based on the design requirements of the packer, the actual well conditions and the expected working conditions; the standard locking stress ensures that the cava can provide sufficient sealing force during the setting process, and the stress evaluation value is used to determine whether the difference between the actual locking stress and the standard locking stress is within an acceptable range; if the absolute value of the difference between the actual locking stress and the standard locking stress is less than or equal to the stress evaluation value, then the locking state of the cava can be considered to be qualified; the stress evaluation value reflects the maximum allowable difference range; and is determined based on the design requirements of the packer, the actual well conditions and the expected working conditions.

[0039] Specifically, the embodiments of the present invention can accurately control the sealing process by real-time monitoring and analysis of the actual locking stress of the slips, thereby ensuring the accuracy and reliability of the locking state of the slips; by identifying and evaluating the actual monitoring images, any abnormal situation can be discovered early in the sealing process, thereby taking timely measures to avoid potential problems; by comprehensively analyzing the actual locking stress and the results of image recognition, the locking state of the slips can be comprehensively evaluated to ensure the quality and reliability of the locking; by real-time monitoring of the locking stress and locking position of the slips, it can be discovered in time whether the slips have any abnormalities during the initial sealing process, such as insufficient locking force or locking position deviation, thereby avoiding sealing failure or equipment damage caused by improper locking of the slips, thereby improving the safety of oil and gas well operations; by setting standard locking stress and stress evaluation values, the locking state of the slips can be provided with a reference value. It provides a clear judgment standard; only when the difference between the actual locking stress and the standard locking stress is within the allowable range, the locking state of the slip is considered qualified; the quantitative evaluation method enhances the reliability of the evaluation results and reduces the subjectivity of human judgment; real-time monitoring and rapid judgment of the locking state of the slip can shorten the debugging time of the initial setting process and improve the operation efficiency; once the locking state of the slip is found to be unqualified, measures can be taken immediately to adjust it, avoiding subsequent shutdowns and rework caused by locking problems; potential problems can be discovered and prevented in time; for example, if the slip does not produce a setting action during the initial setting process, it may be due to a failure of the locking component or improper operation; timely discovery and handling of these problems can avoid subsequent greater losses and risks, providing a strong guarantee for the smooth production and maintenance of oil and gas wells.

[0040] Specifically, in this embodiment, based on the qualified sealing performance of the initial sealing layer and the normal locking process, the process of starting the secondary setting mode includes: Step S410, shearing off the locking component that locks the slip; Step S420, acquiring a sound wave signal during the shearing process, and analyzing the sound wave signal to obtain a sound wave characteristic parameter; Step S430, determining whether the locking component has been cut off according to the acoustic wave characteristic parameters; The acoustic wave characteristic parameters include: transmission duration, transmission frequency and transmission intensity.

[0041] In the specific implementation process, in order to monitor the execution of the shearing operation and confirm whether the locking component has been successfully sheared, the acoustic wave signal is captured in real time during the shearing process; the acoustic wave signal is a non-contact monitoring method that can capture the sound vibrations generated by material fracture, metal collision or mechanical movement; In this embodiment, the acoustic wave signal generated during the shearing process is collected by a highly sensitive acoustic wave sensor or microphone array; after the acoustic wave signal is obtained, the acoustic wave signal is deeply analyzed to extract key acoustic wave characteristic parameters, including: The transmission time is the time required for the sound wave to be generated and received, which can reflect the distance the sound wave propagates and the medium characteristics; The transmission frequency: the frequency distribution of the acoustic signal, different frequency components may correspond to different physical processes or structural characteristics; during the shearing process, the acoustic wave of a specific frequency is directly related to the fracture of the locking component; The transmission intensity: the intensity or amplitude of the sound wave signal can reflect the energy of the sound wave source and the attenuation during the propagation process; at the moment when the locking component is cut off, there is usually an obvious sound wave intensity peak; By comparing the actually measured acoustic wave characteristic parameters with the standard characteristic parameters in the ideal mode, it can be determined whether the locking component has been successfully sheared off; When all acoustic wave characteristic parameters meet the preset conditions, it is determined that the locking component has been successfully sheared off and the next secondary setting operation can be safely performed; Wherein, the preset conditions are standard characteristic parameters under the ideal mode.

[0042] Specifically, the embodiment of the present invention can capture and analyze the sound wave signals generated during the cutting process in real time without directly interfering with the cutting operation through non-contact sound wave monitoring means; avoids the safety risks that may be brought about by traditional contact monitoring, such as mechanical collision, electrical interference, etc., thereby improving the safety of the overall operation; uses a highly sensitive sound wave sensor or microphone array to accurately capture the weak sound wave signals generated during the cutting process, and extracts key sound wave characteristic parameters through in-depth analysis; can accurately reflect the execution of the cutting operation and the state of the locking component, thereby improving the accuracy and reliability of monitoring; analyzes the sound wave signal in real time during the cutting process, and based on the comparison result of the sound wave characteristic parameters with the preset conditions, can instantly give feedback on whether the locking component is successfully cut; the instant feedback mechanism helps the operator to understand the result of the cutting operation in a timely manner, The next operational decision can be made based on this, thereby improving work efficiency and response speed; by comparing the actually measured acoustic wave characteristic parameters with the standard characteristic parameters under the ideal mode, the shearing state of the locking component can be determined more accurately, and the comparison method based on quantitative parameters reduces the subjectivity and uncertainty of human judgment, reduces the misjudgment rate, and improves the accuracy of the judgment; the entire monitoring and judgment process relies on advanced acoustic wave sensing technology and data analysis algorithms, which realizes the automatic monitoring and intelligent judgment of the shearing operation, which not only improves the automation level of the sealing, but also enhances its intelligence level, providing strong support for the intelligent management of oil and gas well operations; by real-time monitoring and judging the shearing state of the locking component, the timing of starting the secondary sealing mode can be accurately controlled, which helps to optimize the operation process, reduce unnecessary waiting time and repeated operations, and improve overall operation efficiency.

[0043] Specifically, the process of real-time monitoring of the secondary setting process to obtain the second setting parameters and determining whether the sealing performance of the final sealing layer is qualified according to the analysis results of the second setting parameters in this embodiment includes: Step S510, monitoring the temperature and pressure in the secondary setting process in real time according to a preset secondary monitoring cycle to obtain various secondary temperature parameters and various secondary pressure parameters; Step S520, measuring various real-time displacement parameters between the packer and the wellbore wall in real time according to the secondary monitoring cycle; Step S530, generating corresponding curves based on each secondary temperature parameter, each secondary pressure parameter and each real-time displacement parameter; Step S540, identifying the number of abnormal points in each curve and the maintenance time of the end parameter, and determining whether the sealing performance of the final sealing layer is qualified according to the number of abnormal points and the maintenance time; Wherein, the second setting parameter includes: the secondary temperature parameter, the secondary pressure parameter and the real-time displacement parameter; In this embodiment, the secondary monitoring period is set to one twelfth of the total duration of the initial setting; In the specific implementation process, in order to comprehensively evaluate the formation quality and sealing of the final sealing layer, key environmental parameters are monitored and recorded in real time, and the temperature and pressure data in the secondary sealing area are automatically collected and recorded according to the preset secondary monitoring cycle; it can reflect the thermodynamic state of the sealing layer during the sealing process and the pressure changes in the wellbore; in this embodiment, a laser rangefinder, an ultrasonic sensor or other displacement measurement equipment is used to record the displacement data of the packer at different positions in real time according to the preset secondary monitoring cycle; it reflects the movement trajectory of the packer during the sealing process and the contact with the well wall, and based on the data points in each monitoring cycle, temperature, pressure and displacement curves are generated respectively, and the temperature, pressure and displacement curves are scanned to identify abnormal points that do not conform to the normal change trend; abnormal points may indicate that a sudden change in temperature, pressure fluctuation or abnormal displacement occurred during the sealing process, which may be a manifestation of poor formation of the sealing layer or poor sealing; the total number of abnormal points on each curve is counted as a quantitative indicator for evaluating sealing. The more abnormal points there are, the more problems there are in the setting process, and the worse the sealing performance of the sealing layer may be. After the setting process is completed, pay attention to the stability of key parameters such as temperature, pressure and displacement, and calculate the maintenance time of these parameters within the preset stable range. The longer the maintenance time, the more stable the sealing layer and the better the sealing performance. Based on indicators such as the number of abnormal points and the maintenance time of the end parameters, comprehensively judge whether the sealing performance of the final sealing layer is qualified.

[0044] The embodiment of the present invention can comprehensively and meticulously capture the dynamic changes in the setting process by real-time monitoring and recording key parameters such as temperature, pressure and displacement in the secondary setting process, and generating corresponding curve graphs based on these parameters; the comprehensive data collection and analysis method makes the evaluation of the sealing performance of the final sealing layer more accurate and reliable; the preset secondary monitoring cycle ensures that any abnormal changes in the setting process can be captured in time; the real-time and dynamic monitoring enables the operator to respond to and deal with potential problems quickly, thereby avoiding the occurrence of poor sealing layer formation or poor sealing performance; by counting the number of abnormal points in the curve graph and calculating the maintenance time of key parameters within the preset stable range, a quantitative indicator is provided for the evaluation of sealing performance; the evaluation results are made more objective and comparable, and it is also convenient for the operator to evaluate based on the actual situation. Targeted analysis and optimization are carried out based on specific values; the real-time monitoring and comprehensive evaluation process enables operators to promptly understand the status and results of the sealing process, so as to adjust the operation process or take necessary remedial measures according to the evaluation results; the instant feedback mechanism helps to reduce unnecessary waiting time and repeated operations, and improves the overall operation efficiency; by comprehensively evaluating the sealing performance of the final sealing layer, the safety and reliability of the oil and gas wells in the subsequent production process can be ensured; a sealing layer with good sealing performance can effectively prevent fluid leakage in the wellbore and formation fluid intrusion, ensuring the normal production of oil and gas wells and the safety of operators; the real-time monitoring and evaluation process relies on advanced sensor technology and data analysis algorithms to realize the automated monitoring and intelligent evaluation of the sealing process; it provides strong support for the intelligent management of oil and gas well operations.

[0045] The calculation compensation parameters and the calculation adjustment parameters described in the present invention have two functions: one is to balance the left and right dimensions of the formula, and the other is to adjust the numerical results. No specific assignment is performed in this embodiment. In addition, the calculation formulas in this embodiment are used to intuitively reflect the adjustment relationship between the numerical values, such as positive correlation and negative correlation. Unless otherwise specified, the parameter values ​​that are not specifically limited to numerical values ​​are all positive.

[0046] So far, the technical solutions of the present invention have been described in conjunction with the preferred embodiments shown in the accompanying drawings. However, it is easy for those skilled in the art to understand that the protection scope of the present invention is obviously not limited to these specific embodiments. Without departing from the principle of the present invention, those skilled in the art can make equivalent changes or substitutions to the relevant technical features, and the technical solutions after these changes or substitutions will fall within the protection scope of the present invention.

[0047] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. For those skilled in the art, the present invention may have various modifications and variations. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention shall be included in the protection scope of the present invention.

Claims

1. A packer slip locking method, characterized in that: include: The driving cylinder compresses the rubber tube, so that the rubber tube expands and fits tightly against the inner wall of the casing to achieve the initial setting of the packer, thereby forming an initial sealing layer; Real-time monitoring of the initial setting process is performed to obtain a first setting parameter, and whether the sealing performance of the initial sealing layer is qualified is determined according to the analysis result of the first setting parameter; Based on the fact that the secondary setting has not started, the slips are locked, and the locking process is monitored in real time, and it is determined whether the slips have generated a setting action during the initial setting process according to the monitoring result; Based on the qualified sealing performance of the initial sealing layer and the normal locking process, the secondary setting mode is started, and the slips are driven to open according to the secondary setting mode to achieve the secondary setting of the packer, thereby forming a final sealing layer; Real-time monitoring of the secondary setting process is performed to obtain a second setting parameter, and whether the sealing performance of the final sealing layer is qualified is determined according to an analysis result of the second setting parameter; Based on the fact that the secondary setting process is qualified, it is determined that the overall sealing of the packer is completed.

2. The packer slip locking method according to claim 1, characterized in that: The process of real-time monitoring the preliminary setting process to obtain the first setting parameter includes: Performing real-time monitoring of the temperature in the preliminary setting process according to a preset primary monitoring cycle to obtain each primary temperature parameter; Performing real-time monitoring of the pressure in the preliminary setting process according to the primary monitoring cycle to obtain each primary pressure parameter; Performing real-time monitoring of the wellhead pressure according to the one monitoring cycle to obtain back pressure parameters of each wellhead; Wherein, the first setting parameter includes: the primary temperature parameter, the primary pressure parameter and the wellhead back pressure parameter.

3. The packer slip locking method according to claim 2, characterized in that: The process of determining whether the sealing performance of the initial sealing layer is qualified according to the analysis result of the first setting parameter comprises: Generate a primary temperature curve according to each primary temperature parameter, generate a primary pressure curve according to each primary pressure parameter, and generate a wellhead back pressure curve according to each wellhead back pressure parameter; Analyzing the primary temperature curve, the primary pressure curve and the wellhead back pressure curve in sequence to determine whether each curve meets a single determination condition; Whether the sealing performance of the initial sealing layer is qualified is determined according to the number of items that meet the single determination condition.

4. The packer slip locking method according to claim 3, characterized in that: The process of sequentially analyzing the primary temperature curve, the primary pressure curve, and the wellhead back pressure curve to determine whether each curve meets a single determination condition includes: For the primary temperature curve, identifying temperature abnormality points in the primary temperature curve, and obtaining the number of temperature abnormality points, and judging whether the primary temperature curve meets the single determination condition according to the number of temperature abnormality points combined with the first temperature end parameter; For the primary pressure curve, identifying abnormal pressure points in the primary pressure curve, obtaining the number of abnormal pressure points, and judging whether the primary pressure curve meets the single determination condition according to the number of abnormal pressure points combined with the first pressure end parameter; For the wellhead backpressure curve, identify abnormal backpressure points in the wellhead backpressure curve, obtain the number of abnormal backpressure points, and determine whether the wellhead backpressure curve meets the single determination condition based on the number of abnormal backpressure points combined with the first backpressure end parameter; Among them, when the rubber sleeve is tightly attached to the inner wall of the casing, a temperature parameter in the initial sealing layer is obtained and recorded as the first temperature end parameter, a pressure parameter in the initial sealing layer is obtained and recorded as the first pressure end parameter, and a wellhead back pressure parameter in the initial sealing layer is obtained and recorded as the first back pressure end parameter.

5. The packer slip locking method according to claim 4, characterized in that: The process of identifying abnormal temperature points in a primary temperature curve includes: For any set of adjacent primary temperature parameters, it includes: the previous temperature parameter and the next temperature parameter; Calculating a first difference absolute value according to the previous temperature parameter combined with the next temperature parameter, and judging whether the group of adjacent primary temperature parameters is the temperature abnormality point according to the first difference absolute value combined with a preset first evaluation value; Wherein, based on the absolute value of the first difference being less than or equal to the first evaluation value, it is determined that the group of adjacent primary temperature parameters is the temperature abnormality point; based on the absolute value of the first difference being greater than the first evaluation value, it is determined that the group of adjacent primary temperature parameters is not the temperature abnormality point; The process of identifying the abnormal pressure point in the primary pressure curve includes: For any set of adjacent primary pressure parameters, it includes: the previous pressure parameter and the next pressure parameter; Calculating a second difference absolute value according to the previous pressure parameter combined with the next pressure parameter, and judging whether the group of adjacent primary pressure parameters is the pressure abnormality point according to the second difference absolute value combined with a preset second evaluation value; Wherein, based on the absolute value of the second difference being less than or equal to the second evaluation value, it is determined that the group of adjacent primary pressure parameters is the pressure abnormality point; based on the absolute value of the second difference being greater than the second evaluation value, it is determined that the group of adjacent primary pressure parameters is not the pressure abnormality point; The process of identifying abnormal back pressure points in the wellhead back pressure curve includes: For any group of adjacent wellhead back pressure parameters, it includes: the front wellhead back pressure parameter and the rear wellhead back pressure parameter; Calculating a third difference absolute value according to the front wellhead back pressure parameter combined with the rear wellhead back pressure parameter, and judging whether the group of adjacent wellhead back pressure parameters is the back pressure abnormal point according to the third difference absolute value combined with a preset third evaluation value; Among them, based on the absolute value of the third difference being less than or equal to the third evaluation value, it is determined that the back pressure parameters of this group of adjacent wellheads are the back pressure abnormality points; based on the absolute value of the third difference being greater than the third evaluation value, it is determined that the back pressure parameters of this group of adjacent wellheads are not the back pressure abnormality points.

6. The packer slip locking method according to claim 5, characterized in that: The process of judging whether each curve meets the single judgment condition includes: For any curve, obtain the stable maintenance time of the end parameter on the curve; Determining whether the end parameter meets the stability requirement according to the stability maintenance time and a preset standard maintenance time; Based on the stability maintenance time being longer than the standard maintenance time, determining that the end parameter meets the stability requirement; Based on the fact that the end parameter meets the stability requirement and the number of abnormal points corresponding to the curve is less than or equal to 1, it is determined that the curve meets the single determination condition.

7. The packer slip locking method according to claim 6, characterized in that: The process of determining whether the sealing performance of the initial sealing layer is qualified according to the number of items that meet the single determination condition includes: When the number of items that meet the single determination condition among the primary temperature curve, the primary pressure curve and the wellhead back pressure curve is 3, it is determined that the sealing performance of the initial sealing layer is qualified; When the number of the items that meet the single determination condition among the primary temperature curve, the primary pressure curve and the wellhead back pressure curve is less than 3, it is determined that the sealing performance of the initial sealing layer is unqualified.

8. The packer slip locking method according to claim 7, characterized in that: The process of real-time monitoring the locking process and determining whether the slips produce a setting action during the initial setting process according to the monitoring result comprises: Obtaining actual locking stress of the slips; Acquiring actual monitoring images of the slips and locking components; Determining whether the locking state of the slip is qualified according to the actual locking stress and the preset standard locking stress; Recognize the actual monitoring image, and determine whether the locking position of the slip is qualified according to the recognition result; Based on the fact that both the locking state and the locking position are qualified, it is determined that the slip has not produced a setting action during the initial setting process.

9. The packer slip locking method according to claim 8, characterized in that: The process of starting the secondary setting mode based on the qualified sealing performance of the initial sealing layer and the normal locking process includes: Shearing off the locking member that locks the slip; Acquiring an acoustic wave signal during the shearing process, and analyzing the acoustic wave signal to obtain acoustic wave characteristic parameters; determining whether the locking component has been cut off according to the acoustic wave characteristic parameters; The acoustic wave characteristic parameters include: transmission duration, transmission frequency and transmission intensity.

10. The packer slip locking method according to claim 9, characterized in that: The process of real-time monitoring the secondary setting process to obtain the second setting parameters, and determining whether the sealing performance of the final sealing layer is qualified according to the analysis results of the second setting parameters includes: Real-time monitoring of the temperature and pressure in the secondary setting process is performed according to a preset secondary monitoring cycle to obtain various secondary temperature parameters and various secondary pressure parameters; measuring various real-time displacement parameters between the packer and the well wall in real time according to the secondary monitoring cycle; Generate corresponding curves based on each secondary temperature parameter, each secondary pressure parameter and each real-time displacement parameter; Identify the number of abnormal points in each curve and the duration of the end parameter maintenance, and determine whether the sealing performance of the final sealing layer is qualified according to the number of abnormal points and the duration of maintenance; Wherein, the second setting parameter includes: the secondary temperature parameter, the secondary pressure parameter and the real-time displacement parameter.

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