Method for commissioning special frequency converter for electric submersible pump

Abstract

The invention discloses a production method of a special frequency converter for an electric submersible pump. The production method comprises the following steps: S1, collecting oil well data; s2, building decline mode data; s3, making a planning scheme; s4, setting VSD production parameters; according to parameter setting in the planning scheme, production parameters of the VSD frequency converter are set, and the production parameters comprise well depth, motor parameters, basic parameters of an oil-submerged pump, parameters of a buck-boost transformer, cable parameters and parameters of an underground sensor; s5, putting into production and running; the VSD frequency converter analyzes and corrects data collected by a sensor in real time, the yield is adjusted and controlled in real time through PID, and an oil well design scheme can be accurately and effectively determined according to the stratum condition, parameters of the electric submersible pump and parameters of the frequency converter; the problem of well condition monitoring in the oil extraction process is effectively solved, automatic liquid production of an oil well is achieved, yield optimization is achieved, the service life of the oil well and equipment is prolonged, and the purpose of automatic oil well management is achieved.

Description

Technical Field

[0001] The present invention relates to the technical field of electrical control of submersible electric pumps, and specifically to a method for commissioning a special frequency converter for submersible electric pumps. Background Technique

[0002] The working principle of the submersible electric pump system is to lower the multi-stage centrifugal pump working underground into the well through the oil pipe and hang it at the bottom of the oil pipe; the ground power supply transmits electrical energy to the submersible motor underground through the submersible cable. After the submersible motor works, it transmits kinetic energy to the submersible oil pump through the shaft, pumping the liquid underground to the ground, which is a rodless downhole mechanical oil production equipment.

[0003] The submersible electric pump mainly consists of a downhole part and surface equipment. The downhole part includes: submersible motor, submersible motor protector, submersible electric pump oil-gas separator, submersible oil pump, downhole measuring device; the surface equipment mainly includes: transformer, junction box, control cabinet (frequency converter).

[0004] The working principle of the submersible electric pump is that electrical energy is transmitted to the submersible motor through the submersible cable, and the submersible motor converts electrical energy into mechanical energy, driving the submersible electric pump to rotate at high speed, lifting the liquid in the oil well to the ground through the oil pipe.

[0005] Due to the harsh working environment of the submersible electric pump system and extremely high operation costs, it is extremely important to reduce the operation time, increase the one-time commissioning success rate, and ensure the continuous and stable operation of the system. Therefore, we need to propose a method for commissioning a special frequency converter for submersible electric pumps. Summary of the Invention

[0006] The purpose of the present invention is to provide a method for commissioning a special frequency converter for submersible electric pumps, which can accurately and effectively determine the oil well design plan according to the formation conditions, submersible electric pump parameters, and frequency converter parameters; effectively solve the problem of well condition monitoring during the oil production process, realize automatic liquid production of the oil well, optimize the production volume, and extend the life of the oil well and equipment, so as to achieve the purpose of automated oil well management, in order to solve the problems raised in the above background technique.

[0007] To achieve the above purpose, the present invention provides the following technical solution: A method for commissioning a special frequency converter for submersible electric pumps, including the following steps: S1. Collect oil well data: Collect basic data of the block, basic data of the well area, basic parameters of the submersible electric pump, and basic data of a single well through sensors and data acquisition equipment, and transmit the collected data to the data acquisition equipment; S2. Establish decline mode data: Sort and analyze the collected data to establish decline mode data of the oil well. The decline mode data includes the initial production capacity of the oil well and the law of gradual decline in production volume over time; S3. Formulate a planning scheme: Formulate a planning scheme based on the decline mode data. The planning scheme includes setting the basic information and parameters of the scheme, setting the oil well production target, and realizing the optimization of the oil well development and production process; S4. Set the commissioning parameters of the VSD: According to the parameter settings in the planning scheme, set the commissioning parameters of the VSD frequency converter. The commissioning parameters include well depth, motor parameters, basic parameters of the submersible pump, step-up / step-down transformer parameters, cable parameters, and parameters of downhole sensors; S5. Commission and operate: After setting the parameters, start the submersible electric pump unit. During the operation, the VSD frequency converter conducts real-time analysis and correction on the data collected by the sensors, and controls the production in real time through PID regulation.

[0008] Preferably, in step S1, for the collected data: Basic data of the block: Geological and geological characteristics of the area where the oil well is located. The geological characteristics include formation thickness, porosity, and permeability; Basic data of the well area: Include basic information such as the wellhead coordinates, well depth, and wellbore diameter of the oil well; Basic parameters of the submersible electric pump: Include motor power, voltage, and current; Basic data of a single well: Include the production data and process parameters of the oil well. The production data and process parameters include oil well production, choke diameter, choke pressure, and injection pressure.

[0009] Preferably, in step S2, establishing the decline mode data includes the following steps: S21. Collect the historical production data and process parameter data of the oil well through the oil well monitoring system, production reports, or other relevant records; S22. Sort out and analyze the collected data to ensure the accuracy and integrity of the data; S23. Use appropriate statistical and data analysis methods to process the data; S24. Establish a decline mode according to the results of data analysis; S25. Use the established decline mode to predict the production in a future period and compare it with the actual production.

[0010] Preferably, in step S3, formulating the planning scheme includes the following steps: S31. Collect relevant geological exploration data, production data, and market intelligence information, analyze the data, and understand the reservoir characteristics, production status, and market demand; S32. Define the goals of the planning scheme. The goals include maximizing production, reducing development costs, and increasing recovery efficiency; S33. Formulate a specific planning scheme. The scheme includes the work plan, investment budget, and resource requirements for each stage; S34. Evaluate the formulated plan and optimize and adjust the evaluation results; S35. Organize and implement the oil production work according to the optimized planning plan, and during the implementation process, through data monitoring and performance evaluation means, timely adjust and optimize the plan to ensure that the plan objectives are achieved.

[0011] Preferably, in step S4, when setting the VSD commissioning parameters, the following aspects should be considered: Analyze the well conditions: comprehensively analyze the physical characteristics and working conditions of the oil well; Select the control mode: according to the well conditions and production objectives, adopt one of the control modes of constant pressure control, constant current control or constant power control; Set the frequency and speed range: set the frequency and speed range of the VSD according to the well conditions and control mode; Adjust the response time: according to the production requirements, adjust the response time of the VSD to ensure that the VSD responds to the well condition changes in a timely manner and maintains a good control effect; Set the protection parameters: avoid damage or failure of the motor and equipment; Implement and monitor: closely monitor the operation of the oil well, timely adjust and optimize the VSD parameters to achieve the best production effect.

[0012] Preferably, in step S5, the steps of commissioning and operation are as follows: Preparation work: Before the oil well is put into production, ensure the integrity and reliability of the equipment and facilities; No-load operation: The equipment runs without the downhole unit and other equipment, and simulates the operation test of various functions under no-load; Load operation: Connect the downhole unit and downhole monitoring equipment with the submersible cable and monitor various technical parameters; Adjust the parameters: According to the actual production situation and monitoring data, adjust the parameters of the system; Monitor and record: Continuously monitor and record the production parameters and well condition changes, and through accurate and timely data monitoring, discover problems early and take corresponding measures for adjustment and optimization.

[0013] Preferably, during the operation of the VSD frequency converter, the work of the VSD frequency converter includes: Sensor data acquisition: The VSD frequency converter is connected to the sensor through a cable to obtain the data of key parameters from the sensor immediately. The key parameter data includes flow rate, pressure and temperature; Data analysis and correction: The control algorithm inside the VSD frequency converter performs real-time analysis on the data collected by the sensor and corrects the data according to the set control strategy; PID regulation: The VSD frequency converter adjusts the output voltage, frequency, and control parameters of the nozzle in real time according to the analyzed and corrected data through the PID control algorithm to achieve the required production adjustment; Output voltage regulation: By changing the output voltage, the rotation speed of the drive motor is controlled, thereby adjusting the flow rate of liquid transportation; Frequency regulation: The VSD frequency converter adjusts the output frequency to adjust the production by changing the rotation speed of the drive motor; Nozzle regulation: The VSD frequency converter controls the opening of the nozzle to adjust the production by changing the speed and amount of liquid inflow.

[0014] Compared with the prior art, the beneficial effects of the present invention are as follows: The present invention can accurately and effectively determine the oil well design plan according to the formation conditions, submersible electric pump parameters, and frequency converter parameters; effectively solve the problem of well condition monitoring during oil production, realize automatic liquid production of oil wells, optimize production, extend the life of oil wells and equipment, and achieve the purpose of automated oil well management. Description of the Drawings

[0015] Figure 1 is the flow block diagram of the present invention; Figure 2 is the flow block diagram for establishing the data of the decline mode of the present invention; Figure 3 is the flow block diagram for formulating the planning scheme of the present invention; Figure 4 is the schematic diagram of the data model for selecting a submersible electric pump of the present invention; Figure 5 is the system block diagram for signal analysis and processing of the submersible electric pump of the present invention. Detailed Embodiments

[0016] The following will clearly and completely describe the technical solutions in the embodiments of the present invention with reference to the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present invention.

[0017] Please refer to Figures 1-5 , the present invention provides a technical solution: a method for commissioning a special frequency converter for a submersible electric pump, including the following steps: S1. Collect oil well data: Collect basic data of the block, basic data of the well area, basic parameters of the submersible electric pump, and basic data of a single well through sensors and data acquisition devices, and transmit the collected data to the data acquisition device; these data may include temperature, pressure, flow rate, wellhead pressure, submersible pump parameters, etc.

[0018] In step S1, for the collected data: Block basic data: Geological and geological characteristics of the area where the oil well is located. Geological characteristics include formation thickness, porosity, and permeability; Well area basic data: Basic information including the wellhead coordinates, well depth, and wellbore diameter of the oil well; Basic parameters of the submersible electric pump: Including motor power, voltage, and current; Single well basic data: Including production data and process parameters of the oil well. Production data and process parameters include oil well production, choke diameter, choke pressure, and injection pressure.

[0019] The above data can be collected through various sensors and monitoring devices. Commonly used sensors include pressure sensors, temperature sensors, flow meters, etc. The collected data can be transmitted to the data acquisition device through wireless communication, wired connection, or other communication methods.

[0020] S2. Establish decline mode data: Organize and analyze the collected data to establish decline mode data for the oil well. The decline mode data includes the initial productivity of the oil well and the law of gradual decline in production over time; it helps to understand the production status and production change trend of the oil well.

[0021] In step S2, establishing the decline mode data includes the following steps: S21. Collect historical production data and process parameter data of the oil well through the oil well monitoring system, production reports, or other relevant records; S22. Organize and analyze the collected data to ensure the accuracy and integrity of the data; exclude outliers or incorrect data to ensure that the data can reflect the true production and process conditions.

[0022] S23. Use appropriate statistical and data analysis methods to process the data; commonly used methods include linear regression, exponential decline model, etc. Select a suitable method to establish the decline mode according to the data characteristics and objectives.

[0023] S24. Establish a decline mode based on the results of data analysis; it can be a simple linear model or a more complex non-linear model, depending on the trend of the data. The establishment of the decline mode should consider various influencing factors, such as the physical characteristics of the oil well and the dynamic changes of the oil reservoir.

[0024] S25. Use the established decline mode to predict the production for a future period of time and compare it with the actual production. According to the comparison results, adjust and optimize the model to improve the prediction accuracy.

[0025] S3. Develop a planning scheme: Develop a planning scheme based on the decline pattern data. The planning scheme includes setting the basic information and parameters of the scheme, setting the oil well production target, and realizing the optimization of the oil well development and production process. The planning scheme can be determined according to the characteristics and requirements of the oil well, aiming to increase production and stability.

[0026] In step S3, developing the planning scheme includes the following steps: S31. Collect relevant geological exploration data, production data, and market intelligence information, analyze the data, and understand the reservoir characteristics, production status, and market demand. S32. Define the objectives of the planning scheme, including maximizing production, reducing development costs, and increasing recovery rate. S33. Considering factors such as development costs, risks, and technical feasibility, develop a specific planning scheme, which includes the work plan, investment budget, and resource requirements for each stage. S34. Evaluate the developed scheme and optimize and adjust the evaluation results. S35. Organize oil production work according to the optimized planning scheme, and during the implementation process, through data monitoring and performance evaluation means, timely adjust and optimize the scheme to ensure that the scheme objectives are achieved.

[0027] S4. Set the commissioning parameters of the VSD: According to the parameter settings in the planning scheme, set the commissioning parameters of the VSD frequency converter. The commissioning parameters include well depth, motor parameters, basic parameters of the submersible pump, step-up / step-down transformer parameters, cable parameters, and parameters of downhole sensors. The parameters need to be configured according to the specific conditions and requirements of the oil well.

[0028] In step S4, when setting the commissioning parameters of the VSD, the following aspects should be considered: Analyze the well conditions: Conduct a comprehensive analysis of the physical characteristics and operating conditions of the oil well, including wellbore depth, reservoir characteristics, and dynamic data of the oil well (such as flow rate, pressure, temperature, etc.). By understanding the well conditions, the appropriate VSD control mode and parameters can be determined.

[0029] Select the control mode: According to the well conditions and production objectives, adopt one of the control modes of constant pressure control, constant current control, or constant power control. Constant pressure control is used to maintain the oil well pressure. Constant current control is used to control the oil well production. Constant power control is used to optimize the balance between energy consumption and production.

[0030] Set the frequency and speed range: According to the well conditions and control mode, set the frequency and speed range of the VSD. High frequency and high speed are usually used to increase production, while low frequency and low speed are used to reduce production. The setting of frequency and speed should be determined according to the physical characteristics and operating requirements of the oil well.

[0031] Adjust the response time: The response time of the VSD directly affects the flow stability of the fluid in the wellbore. According to the production requirements, adjust the response time of the VSD to ensure that the VSD responds to well condition changes in a timely manner and maintains good control effects; Set protection parameters: By setting appropriate protection parameters, avoid damage or faults to the motor and equipment; The protection parameters include overcurrent protection, overload protection, overtemperature protection, etc.

[0032] Implementation and monitoring: Closely monitor the operation of the oil well, and adjust and optimize the VSD parameters in a timely manner to achieve the best production results.

[0033] S5. Commissioning and operation: After setting the parameters, start the submersible electric pump unit. During the operation process, the VSD frequency converter performs real-time analysis and correction on the data collected by the sensors, and adjusts the production volume in real time through PID. By adjusting technical means such as frequency, choke, and output voltage, achieve the effects of stable production volume and high-efficiency liquid production, realize the stable and efficient production of the oil well, improve the recovery rate, and reduce the labor cost.

[0034] In step S5, the steps of commissioning and operation are as follows: Preparation work: Before the commissioning of the oil well, ensure the integrity and reliability of the equipment and facilities; Conduct equipment inspection, maintenance, and calibration to ensure its normal operation before commissioning. In addition, it is necessary to formulate operating procedures and safety measures, train the operators, and formulate emergency plans.

[0035] No-load operation: The equipment runs without the downhole unit and other equipment, and simulates the operation of various functions under no-load; During the no-load operation process, it is necessary to closely monitor the performance and operation status of the equipment to ensure the smooth operation of the equipment.

[0036] Load operation: Connect the downhole unit and downhole monitoring equipment with the submersible cable, and monitor various technical parameters; During this process, it is necessary to closely observe and monitor the well condition parameters to ensure the stable operation of the equipment and the oil well.

[0037] Adjust parameters: According to the actual production situation and monitoring data, adjust the parameters of the system; including adjusting the operating parameters of the equipment, such as pump speed, pressure, temperature, etc.

[0038] Monitoring and recording: Continuously monitor and record the production parameters and well condition changes. Through accurate and timely data monitoring, discover problems early and take corresponding measures for adjustment and optimization. The monitoring content includes oil well production volume, pressure, temperature, oil-water ratio, gas injection volume, etc.

[0039] And, during the operation of the VSD frequency converter, the work of the VSD frequency converter includes: Sensor data acquisition: The VSD frequency converter is connected to the sensor via a cable to immediately obtain data on key parameters from the sensor. The key parameter data includes flow rate, pressure, and temperature; Data analysis and correction: The control algorithm inside the VSD frequency converter performs real-time analysis on the data collected by the sensor and corrects the data according to the set control strategy; PID regulation: The VSD frequency converter adjusts the output voltage, frequency, and control parameters of the nozzle in real time according to the analyzed and corrected data through the PID control algorithm to achieve the required production adjustment; Output voltage regulation: By changing the output voltage, the speed of the drive motor is controlled, thereby adjusting the flow rate of liquid transportation; Frequency regulation: The VSD frequency converter adjusts the output frequency to adjust the production by changing the speed of the drive motor; The frequency is proportional to the speed, so adjusting the frequency can achieve precise production control.

[0040] Nozzle regulation: The VSD frequency converter controls the opening of the nozzle to adjust the production by changing the speed and amount of liquid inflow.

[0041] After obtaining relevant parameters such as data from old wells in the same area, data of newly converted single wells, and basic data of electric pump wells, analyze the production of old wells, production of single wells, and basic data of electric pumps to form a production planning plan for new wells. Furthermore, select the motor, pump, suction inlet, submersible cable, and frequency converter to form a complete design plan for facilitating subsequent oil well management.

[0042] After production according to the determined design plan, analyze the formation conditions through downhole sensor data and monitor the real-time production of the oil well. If it does not match the expected production or the well condition is not ideal, perform real-time PID regulation through the VSD and nozzle to reduce manual intervention to achieve production optimization, extend the life of the oil well and equipment, and achieve the purpose of automated oil well management.

[0043] As Figure 4 shown, when establishing the data model of the submersible electric pump, after mastering basic parameters such as formation data, old well data, and basic data of electric pumps, establish a single well data model and form a common basic database, and then establish a planning plan - set the basic information and parameters of the plan, and set the planned production of the plan; According to the old well data, planned production, and single well production, automatically generate a production planning plan for new wells, and form the selection of downhole pumps, motors, suction inlets, cables, etc. and the selection of surface VSDs, transformers, surface cables, nozzles.

[0044] As Figure 5As shown, it belongs to the scope of post-production oil well planning and management. The software collects downhole sensor data. After analysis and processing, if it meets the expectations, it will continue to work. If it does not meet the expectations or there are differences in the downhole data, the production volume can be adjusted by adjusting the frequency, voltage, and current of the VSD, or by adjusting the choke valve, realizing automatic liquid production of the oil well, optimizing the production volume, and extending the service life of the oil well and equipment, achieving the purpose of automated oil well management.

[0045] Although the embodiments of the present invention have been shown and described, those of ordinary skill in the art can understand that various changes, modifications, substitutions, and variations can be made to these embodiments without departing from the principles and spirit of the present invention. The scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A method for commissioning a special frequency converter for submersible electric pumps, characterized in that: It includes the following steps: S1. Collect well data: Collect basic block data, basic well area data, basic parameters of submersible electric pumps, and basic single-well data through sensors and data acquisition devices, and transmit the collected data to the data acquisition device; S2. Establish decline mode data: Organize and analyze the collected data to establish decline mode data for the oil well. The decline mode data includes the initial production capacity of the oil well and the law of gradual decline in production over time; S3. Develop a planning scheme: Develop a planning scheme based on the decline mode data. The planning scheme includes setting basic information and parameters of the scheme, setting the production target of the oil well, and realizing the optimization of the oil well development and production process; S4. Set VSD commissioning parameters: Set the commissioning parameters of the VSD frequency converter according to the parameter settings in the planning scheme. The commissioning parameters include well depth, motor parameters, basic parameters of the submersible pump, step-up / step-down transformer parameters, cable parameters, and parameters of downhole sensors; S5. Commission and operate: After setting the parameters, start the submersible electric pump unit. During the operation process, the VSD frequency converter performs real-time analysis and correction on the data collected by the sensors, and adjusts and controls the production in real time through PID.

2. The commissioning method of a special frequency converter for submersible electric pumps according to claim 1, characterized in that: In step S1, for the collected data: Basic block data: The geology and geological characteristics of the area where the oil well is located. The geological characteristics include formation thickness, porosity, and permeability; Basic well area data: Include basic information such as the wellhead coordinates, well depth, and wellbore diameter of the oil well; Basic parameters of submersible electric pumps: Include motor power, voltage, and current; Basic single-well data: Include the production data and process parameters of the oil well. The production data and process parameters include oil well production, choke diameter, choke pressure, and injection pressure.

3. The commissioning method of a special frequency converter for submersible electric pumps according to claim 1, characterized in that: In step S2, establishing the decline mode data includes the following steps: S21. Collect historical production data and process parameter data of the oil well through the oil well monitoring system, production reports, or other relevant records; S22. Organize and analyze the collected data to ensure the accuracy and integrity of the data; S23. Use appropriate statistical and data analysis methods to process the data; S24. Establish a decline mode based on the results of data analysis; S25. Use the established decline mode to predict the production for a future period of time and compare it with the actual production.

4. A method for commissioning a special frequency converter for submersible electric pumps according to claim 1, characterized in that: In step S3, developing a planning scheme includes the following steps: S31. Collect relevant geological exploration data, production data, and market intelligence information, analyze the data, and understand the reservoir characteristics, production status, and market demand; S32. Define the goals of the planning scheme. The goals include maximizing production, reducing development costs, and increasing recovery efficiency; S33. Develop a specific planning scheme. The scheme includes work plans, investment budgets, and resource requirements for each stage; S34. Evaluate the developed scheme and optimize and adjust the evaluation results; S35. Organize oil production work according to the optimized planning scheme, and during the implementation process, through data monitoring and performance evaluation means, timely adjust and optimize the scheme to ensure that the scheme goals are achieved.

5. A production start-up method for a special frequency converter for submersible electric pumps according to claim 1, characterized in that: In step S4, when setting the VSD commissioning parameters, the following aspects should be considered: Analyze well conditions: comprehensively analyze the physical characteristics and operating conditions of the oil well; Select control mode: according to the well conditions and production targets, adopt one of the control modes of constant pressure control, constant current control or constant power control; Set frequency and speed range: according to the well conditions and control mode, set the frequency and speed range of the VSD; Adjust response time: according to production requirements, adjust the response time of the VSD to ensure that the VSD responds promptly to changes in well conditions and maintains good control effect; Set protection parameters: avoid damage or failure of the motor and equipment; Implement and monitor: closely monitor the operation of the oil well, timely adjust and optimize the VSD parameters to achieve the best production effect.

6. A method for commissioning a dedicated frequency converter for submersible electric pumps according to claim 1, characterized in that: In step S5, the steps for commissioning and operation are as follows: Preparation work: before the oil well is put into production, ensure the integrity and reliability of the equipment and facilities; No-load operation: the equipment runs without the downhole unit and other equipment, and conducts no-load simulation operation to test various functions; Load operation: connect the downhole unit and downhole monitoring equipment with the submersible cable and monitor various technical parameters; Adjust parameters: according to the actual production situation and monitoring data, adjust the parameters of the system; Monitor and record: continuously monitor and record production parameters and changes in well conditions, and through accurate and timely data monitoring, detect problems early and take corresponding measures for adjustment and optimization.

7. A method for commissioning a special frequency converter for submersible electric pumps according to claim 1, characterized in that: During the operation of the VSD frequency converter, the work of the VSD frequency converter includes: Sensor data acquisition: the VSD frequency converter is connected to the sensor through a cable and immediately obtains the data of key parameters from the sensor. The key parameter data includes flow rate, pressure and temperature; Data analysis and correction: the control algorithm inside the VSD frequency converter conducts real-time analysis on the data collected by the sensor and corrects the data according to the set control strategy; PID regulation: the VSD frequency converter adjusts the control parameters of the output voltage, frequency and choke according to the data after analysis and correction through the PID control algorithm to achieve the required production adjustment; Output voltage regulation: control the speed of the drive motor by changing the output voltage, so as to adjust the flow rate of liquid transportation; Frequency regulation: the VSD frequency converter adjusts the output frequency and adjusts the production by changing the speed of the drive motor; Choke regulation: the VSD frequency converter controls the opening of the choke and adjusts the production by changing the speed and amount of liquid inflow.

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