Tubeless continuous water extraction intelligent packer device for water source well and quantitative water extraction method thereof

Abstract

The present invention relates to a tubeless continuous water extraction intelligent packer device for a water source well and a quantitative water extraction method thereof, wherein the tubeless continuous water extraction intelligent packer device for a water source well comprises a packer, a trigger device, a flow sensor, an ultrasonic transmitting / receiving module, and an intelligent control system, wherein the trigger device is located in a wellbore casing, the lower end of the trigger device is fixedly connected to a transmission rod, the lower end of the transmission rod is connected to a drainage valve, the drainage valve is located in a packer cavity, a transmission rod hole is provided at the center of the top of the packer shell, fan-shaped drainage holes are evenly arranged circumferentially outside the transmission rod hole, and a valve plate of the drainage valve is formed by fan blades evenly arranged along the circumference; a symmetrical stop hinge is installed at the upper end of the transmission rod, a double-arm lever is hinged to the upper end of the pair of stop hinges, a pair of slips are hinged at the lower end of the pair of stop hinges, and a sliding roller is fixed at the upper end of the double-arm lever; and the lower end of the center pipe of the packer is fixedly connected to a discharge nozzle of a submersible pump. The present invention realizes continuous water extraction in a water source well without a water pumping pipeline, and reduces pipe consumption.

Description

Technical field:

[0001] The invention relates to a device structure for continuously supplying water to a water source well in an oil field for use in water drive and chemical drive oil production, and specifically to a tubeless continuous water production intelligent packer device for a water source well and a quantitative water production method thereof. Background technology:

[0002] As most of my country's oil fields enter the middle and late stages of development, water-driven oil recovery technology that replenishes formation energy through water injection and chemical-driven oil recovery technology that increases recovery by injecting chemical solutions have been widely used. For oilfield blocks that use water-driven oil recovery, water source wells are the main source of water injected during oilfield development. For oilfield blocks that use chemical-driven oil recovery, water source wells are mainly used to provide low-mineralized clean water to mix with chemical powder to prepare mother liquor, which is injected into the formation after maturation, dilution and deployment to achieve oil recovery.

[0003] Traditional water wells in oil fields are mainly produced through the combination of submersible pumps and water-lifting pipes. The submersible pumps are fixed in the wells with the help of water-lifting pipes, and groundwater is transported to the ground. This water-collection method requires that each water well needs to be lowered into a water-lifting pipe that meets the length requirements. When the number of water wells increases, the demand for pipes is large, and the corrosion problem of water-lifting pipes seriously affects the service life of water wells. In addition, the existing water well water-collecting devices in oil fields are difficult to realize dynamic monitoring of the liquid level of water wells. When the liquid level of water wells drops, the phenomenon of submersible pumps being idling often occurs, which not only wastes electricity, but also seriously affects the service life of submersible pumps, resulting in a shortened well repair cycle and increased costs for water wells, resulting in insufficient and unstable water supply in water wells, which directly affects oil field development. For oil field blocks that use chemical flooding for oil production, due to the differences in reservoir geological characteristics and formation pressure in different blocks, chemicals can only achieve the best oil recovery effect at a specific concentration, which requires the concentration of chemical mother liquor to be adjusted according to actual conditions during oil field production. For example, for polymer drive, usually, oil fields mainly adjust the concentration of polymer mother liquor by mixing polymer dry powder and clean water in a dissolution tank in a certain proportion. The amount of clean water injected into the dissolution tank is mainly controlled by manually controlling the start and stop of the submersible pump of the water source well. There is often a deviation between the actual water production volume obtained in this way and the required water production volume, resulting in fluctuations in the concentration of the polymer mother liquor and the "fisheye" phenomenon. This raises the technical problem of optimizing the design of the structure of the water source well water production device and realizing its intelligent control, so as to solve the problems of large demand for pipes and short life of water source well facilities in traditional water source well water production structures, especially the dynamic monitoring of the liquid level of the water source well and intelligent quantitative water production. It is particularly important to scientifically design the structure of the water source well water production device and realize its intelligent control. Summary of the invention:

[0004] One object of the present invention is to provide a tubeless continuous water production intelligent packer device for water source wells. This tubeless continuous water production intelligent packer device for water source wells is used to solve the problems of large demand for pipes and short life of water source well facilities in the prior art for water production through a combination structure of a submersible pump and a pumping pipe; another object of the present invention is to provide a quantitative water production method for a tubeless continuous water production intelligent packer for water source wells, so as to solve the problems of dynamic monitoring of the liquid level in the water source well and intelligent quantitative water production.

[0005] The technical solution adopted by the present invention to solve its technical problem is: this tubeless continuous water extraction intelligent packer device for water source wells includes a packer, a trigger device, a submersible pump, a flow sensor, an ultrasonic transmitting / receiving module, and an intelligent control system. The trigger device is located in the wellbore casing, and the lower end of the trigger device is fixedly connected to a transmission rod, and the lower end of the transmission rod is connected to a drain valve, which is located in the packer cavity. A transmission rod hole is provided at the center of the top end of the packer shell, and fan-shaped drainage holes are evenly arranged circumferentially outside the transmission rod hole. The valve plate of the drain valve is formed by fan blades evenly arranged along the circumference. The drain valve is used to open Open or close the fan-shaped drainage hole; a symmetrical stop hinge is installed on the upper end of the transmission rod, the double-arm lever is hinged to the upper ends of the pair of stop hinges, and a pair of slips are hinged to the lower ends of the pair of stop hinges. A sliding roller is fixed to the upper end of the double-arm lever, and the sliding roller rolls up and down along the inner wall of the wellbore casing, and the slips are used to be clamped on the wellbore casing; the lower end of the center tube of the packer is fixedly connected to the discharge nozzle of the submersible pump, the submersible pump is connected to the frequency converter on the ground, the frequency converter is connected to the intelligent control system, the upper end of the wellbore casing is connected to the water outlet pipeline, a flow sensor is arranged on the water outlet pipeline, and an ultrasonic transmitting / receiving module is arranged under the packer.

[0006] In the above scheme, a double-arm lever limit plate is provided at the upper end of the transmission rod, one side of the bottom end of the double-arm lever is clamped on the double-arm lever limit plate, and the other side of the bottom end of the double-arm lever is hinged to the stop hinge; the transmission rod is also provided with a stop hinge seat, the stop hinge seat is located below the double-arm lever limit plate, the stop hinge is installed through the stop hinge seat, and the top angle of the cava side is clamped under the bottom surface of the stop hinge seat.

[0007] In the above scheme, the packer consists of an upper packer and a lower packer. The rubber barrel of each packer is fixed by the packer shell. The rubber barrel and the packer cavity are connected through the packer center tube. A center hole is provided at the bottom of the inner cavity of the upper packer. The saddle with a hole naturally sits on the center hole. The lower end of the saddle with a hole extends into the cavity of the lower packer. The ultrasonic transmitting / receiving module is provided under the bottom surface of the lower packer.

[0008] The quantitative water extraction method of the above-mentioned tubeless continuous water extraction intelligent packer device for water source wells:

[0009] The intelligent control system uses the STM32F103C8T6 microcontroller as the central control chip. Its power module, key control module, display module, communication module, temperature acquisition unit, register module and ultrasonic transmitting / receiving module constitute the ultrasonic ranging system. The distance between the ultrasonic transmitting module, receiving module and the measured liquid surface is:

[0010]

[0011] Where S is the distance between the ultrasonic emission position and the measured liquid surface, m; C is the sound speed in the current environment, m / s; t1+t2+t3+...+t n The timing of measuring N round trips to the same position, s;

[0012] The expression for the speed of sound is:

[0013] C=331.45+0.607T(2)

[0014] Where, T is the thermodynamic temperature, K;

[0015] The intelligent control system constructs a quantitative water collection control system through its power module, key control module, display module, communication module, register module, drive unit and flow sensor. The quantitative water collection is turned on and the water supply demand is input through the key control module. The flow sensor measures the cumulative flow through the outlet pipeline. The communication module transmits the cumulative flow data to the STM32 microcontroller. The deviation value between the water supply demand and the cumulative flow of the outlet pipeline is input into the intelligent algorithm for calculation. The calculated value is used as a control signal to control the drive unit, and the operating power of the submersible pump in the water supply process is controlled in real time to achieve quantitative water collection.

[0016] Δu(k)%=PΔe(k)%+Ie(k)%+D[Δe(k)%-Δe(k-1)%],Δu k %∈(0,1) (11)

[0017] Δu(k)% is the input signal of the frequency converter to control the output power of the asynchronous motor. Its size determines the operating power of the submersible pump. When Δu(k)%=1, the submersible pump runs at full power; when Δu(k)%=0, the cumulative flow through the outlet pipeline is equal to the water supply demand, and the submersible pump stops running; Δu(k) is the PID output increment value; P is the proportional coefficient; I is the integral coefficient; D is the differential coefficient; P, I, and D are all decimals between 0 and 1; k is the sampling sequence number; e is the deviation;

[0018] Start quantitative water collection through the button control module, and input the water supply demand, so as to realize intelligent quantitative water collection without human control.

[0019] In the above solution, the STM32F103C8T6 microcontroller has built-in ADC and DAC converters to convert digital signals into analog signals, thus realizing data collection and intelligent control in the production process.

[0020] In the above scheme, the accumulated flow data measured by the flow sensor and the ultrasonic signal received by the ultrasonic receiving module are converted into 4-20mA electrical signals and input into the intelligent control system.

[0021] In the above scheme, the packer adopts a double rubber barrel combined structure. The maximum outer diameter of the rubber barrel is selected according to the diameter of the wellbore casing, and the outward inclination angle of the rubber barrel is 45°.

[0022] In the above scheme, the diameter of the water outlet hole connecting the center tube of the packer and the rubber barrel is 10 mm.

[0023] Beneficial effects:

[0024] 1. The present invention utilizes wellbore casing and packer to collect underground water from the water source well to the surface, realizing continuous water collection without pumping pipes in the water source well, so as to minimize pipe consumption and increase the service life of the water source well, and effectively avoid water hammer when the water source well stops pumping and closes valves, which damages the submersible pump and pipeline. In addition, the water collection method of replacing the pumping pipe with the wellbore casing can significantly reduce the water flow velocity during the water collection process, reduce the friction resistance along the pipeline, reduce the pressure loss during the water collection process, improve the operating efficiency of the submersible pump, and reduce energy consumption.

[0025] 2. The present invention simplifies the installation and disassembly process of the submersible pump. The submersible pump and the packer are fixed in the well by stop hinges and slips, and their installation and fixing positions can be dynamically adjusted according to the liquid level changes in the water source well, ensuring the intelligent installation and the continuity of pipeless continuous water extraction.

[0026] 3. The present invention uses ultrasonic ranging method to dynamically monitor the liquid level of the water source well. According to the time from the emission to the reception of the ultrasonic pulse, combined with the speed of sound at the current temperature, the distance between the liquid level and the ultrasonic sensor can be obtained. During the operation of the water source well, the system can dynamically monitor the changes in the liquid level of the water source well, and dynamically adjust the fixed position of the packer according to the changes in the liquid level, effectively avoiding the idling of the submersible pump caused by the drop in liquid level.

[0027] 4. The present invention uses the deviation between the cumulative flow of the water source well outlet pipeline and the water supply demand as the input value of the PID algorithm, and outputs a dimensionless control signal after calculation to adjust the output power of the asynchronous motor through the frequency converter, thereby realizing real-time control of the operating power of the submersible pump during the water supply process to meet the quantitative water extraction. In particular, when preparing the chemical mother liquor in oil field production, quantitative water extraction can be achieved under unmanned conditions by inputting the water supply demand through the key control module, reducing the error caused by manual control of the start and stop of the submersible pump, so that the chemical mother liquor is optimally prepared. In addition, during the quantitative water extraction process of the water source well, the submersible pump operates at variable power, and its power can be dynamically adjusted as the deviation between the cumulative flow of the water outlet pipeline and the water supply demand changes, thereby significantly reducing the energy consumption of the submersible pump.

[0028] 5. The present invention is used to meet the structural requirements of continuous water extraction facilities in oil field water source wells, realize pipeless continuous water extraction by replacing the pumping pipe with the well casing, realize dynamic monitoring of the liquid level of the water source well, and control the operation of the submersible pump through an intelligent algorithm to achieve quantitative water extraction according to the water supply demand. Description of the drawings:

[0029] Figure 1 It is a structural schematic diagram of the device of the present invention;

[0030] Figure 2 This is the hardware structure diagram of the ultrasonic liquid level detection system;

[0031] Figure 3 This is the hardware structure diagram of the quantitative water collection system;

[0032] Figure 4 The schematic diagram of quantitative water sampling using PID algorithm;

[0033] Figure 5 Schematic diagram of the top structure of the packer casing.

[0034] Figure 6 This is a schematic diagram of the structure of the drain valve.

[0035] In the figure: 1. Packer; 2. Flange; 3. Submersible pump discharge nozzle; 4. Packer center pipe; 5. Submersible pump; 6. Packer housing; 7. Slip; 8. Drain valve; 9. Transmission rod; 10. Wellbore casing; 11. Saddle with holes; 12. Stop hinge; 13. Sliding roller; 14. Double-arm lever; 15. Cable; 16. Trigger device; 17. Packer cavity; 18. Liquid outlet; 19. Rubber barrel; 20. Ultrasonic transmitting / receiving module; 21. Flow sensor; 22. Water outlet pipeline; 23. Frequency converter; 24. Intelligent control system. Specific implementation method:

[0036] like Figure 1As shown, the trigger device 16 of the tubeless continuous water extraction intelligent packer device for water source wells is located in the wellbore casing 10. The trigger device 16 is a variable diameter rotary body. The lower end of the trigger device 16 is fixedly connected to the transmission rod 9 through a double-arm lever limit plate. The lower end of the transmission rod 9 is connected to the drainage valve 8. The drainage valve 8 is located in the packer cavity 17. The center of the top of the packer housing 6 has a transmission rod hole. Figure 5 and Figure 6 The fan-shaped drainage holes are evenly arranged on the outer side of the transmission rod hole. The valve plate of the drainage valve 8 is formed by fan blades evenly arranged along the circumference. The drainage valve 8 is used to open or close the fan-shaped drainage holes. A pressure relief hole is also provided on the packer housing 6. The pressure relief hole is located outside the fan-shaped drainage hole and communicates with the packer cavity. When the trigger device 16 is pressed down, the pressure in the packer cavity 17 is reduced, and the pressure when the drainage valve 8 is moved downward is reduced; a symmetrical stop hinge 12 is installed on the upper end of the transmission rod 9, and the double-arm lever 14 is hinged to the upper end of the pair of stop hinges 12. The pair of stop hinges 12 A pair of slips 7 are hinged at the lower end, and a sliding roller 13 is fixed at the upper end of the double-arm lever 14. The two sliding rollers 13 roll up and down along the inner wall of the wellbore casing 10. The slips 7 are used to be clamped on the wellbore casing 10. The lower end of the packer center pipe 4 is fixedly connected to the discharge nozzle 3 of the submersible pump. The submersible pump 5 is connected to the frequency converter 23 on the ground. The frequency converter 23 is connected to the intelligent control system 24. The upper end of the wellbore casing 10 is connected to the water outlet pipeline 22. The flow sensor 21 is arranged on the water outlet pipeline 22. The ultrasonic transmitting / receiving module 20 is arranged under the packer 1. When the tubeless continuous water extraction intelligent packer device for water source wells is lowered, the two sliding rollers 13 roll down along the inner wall of the wellbore casing 10. The two sliding rollers 13 are symmetrical with respect to the center line of the wellbore casing, which can prevent the packer 1 from twisting and ensure that it moves straight downward without circumferential deviation. When the device is lowered, the valve plate of the drainage valve is pressed under the packer shell to close the fan-shaped drainage hole.

[0037] A double-arm lever limit plate is provided at the upper end of the transmission rod 9, one side of the bottom end of the double-arm lever 14 is stuck on the double-arm lever limit plate, and the other side of the bottom end of the double-arm lever 14 is hinged to the stop hinge 12; the transmission rod 9 is also provided with a stop hinge seat, the stop hinge seat is located below the double-arm lever limit plate, the stop hinge 12 is installed through the stop hinge seat, and the top angle of the cava side is stuck under the bottom surface of the stop hinge seat.

[0038] In this embodiment, the packer is composed of an upper packer and a lower packer. The rubber barrel of each packer is fixed by the packer shell. The rubber barrel 19 is connected to the packer cavity 17 through the packer center tube 4. A center hole is set at the bottom of the upper packer cavity. The saddle with a hole naturally sits on the center hole. The lower end of the saddle with a hole extends into the lower packer cavity. The ultrasonic transmitting / receiving module is set under the bottom surface of the lower packer. The diameter of the water outlet hole connecting the packer center tube and the rubber barrel is 10mm. The packer adopts a double rubber barrel combined structure. The maximum outer diameter of the rubber barrel is selected according to the diameter of the wellbore casing, and the outward inclination angle of the rubber barrel is 45°.

[0039] To ensure that the concentrated stress of the rubber barrel is small, the angle of the rubber barrel is 45°, and the submersible pump 5 is connected to the packer 1 through a flange 2; after the ultrasonic liquid level monitoring function is turned on in the intelligent control system 24, the ultrasonic transmitting / receiving module 20 installed at the bottom of the packer shell 6 transmits ultrasonic pulses and receives the reflected ultrasonic pulse signals. The signals are converted and shaped and then transmitted to the intelligent control system 24 to obtain the distance between the liquid level of the water source well and the ultrasonic transmitting / receiving module 20; when the packer is installed, the rigid rod is connected to the trigger device 16 of the packer, and the anti-twist structure composed of the sliding roller 13 and the double-arm lever 14 can ensure that the packer device does not twist during the installation process. When the packer is lowered to the installation position, the submersible pump 5 is started. At this time, the drain valve 8 of the packer is in a closed state, and the water is discharged through the pump discharge nozzle 3 into the packer center pipe 4 and passes through the perforated saddle 11 enters the cavity 17 of the packer, and the water flows into the rubber barrel 19 through the water outlet hole 18. The rubber barrel is expanded by force and fits tightly with the well casing 10 to achieve sealing. At this point, the water source well is divided into a submersible pump water collection part and a water collection and discharge part; after the sealing is achieved, the installation rod is pressed to trigger the trigger device 16 and drive the transmission rod 9 to make the cava 7 contact with the well casing 10. The cava 7 fixes the packer and the submersible pump in the well through the interaction with the stop hinge 12. At this time, the packer drain valve 8 is opened, and the water enters the water collection and discharge part through the drain valve 8; the quantitative water collection function is turned on in the intelligent control system 24 and the water supply demand is input. The flow sensor 21 detects the cumulative flow flowing through the water outlet pipeline 22, and inputs the cumulative flow data into the intelligent control system 24 for calculation. The result is used as the input value of the frequency converter 23. The frequency converter adjusts the operating power of the submersible pump through the cable 15 to achieve quantitative water collection.

[0040] like Figure 4As shown, in the process of quantitative water extraction from the water source well using the PID algorithm, the flow sensor 21, the intelligent control system 24, the frequency converter 23, the submersible pump 5 and the asynchronous motor driving the submersible pump together form a closed-loop control system. The deviation between the water supply demand and the cumulative flow of the outlet pipeline is used as the input value of the PID algorithm for calculation, and the result is used as the input signal of the frequency converter 23. The frequency converter 23 dynamically adjusts the output power of the asynchronous motor to achieve real-time control of the operating power of the submersible pump 5 and quantitative water extraction during the water supply process.

[0041] (I) The integrated structure of the intelligent packer and the realization of pipeless continuous water production. The intelligent packer consists of three interrelated units, including a sealing unit, a fixing and anti-twist unit and an intelligent control system. The rubber barrel 19 of the sealing unit expands under the action of the internal hydraulic pressure and fits tightly with the wellbore casing 10, dividing the water source well into a submersible pump water production part and a water production and discharge part. The stop hinge 12 and slip 7 in the fixing and anti-twist unit fix the submersible pump 5 and the packer 1 in the well. The anti-twist structure composed of a sliding roller 13 and a double-arm lever 14 ensures that the packer 1 does not twist during installation. The intelligent control system 24 is arranged at the wellhead of the water source well in the form of a control cabinet, which can realize dynamic monitoring of the liquid level of the water source well and real-time control and quantitative water production of the variable power operation of the submersible pump 5 during the water supply process. Tubeless continuous water production is a technology that uses a wellbore casing 10 and a packer 1 to extract water to the ground. In this integrated packer structure, the flange 2 between the packer 1 and the submersible pump is connected, and the submersible pump discharge nozzle 3 is connected to the center pipe 4 of the packer. The produced water flows into the water source well through the center pipe and into the water discharge part. After the produced water fills the discharge part, it flows through the water source well outlet pipeline 22 with a valve and a flow sensor 21 to supply the water production unit, thereby realizing tubeless continuous water production from the water source well.

[0042] (II) Structural design of intelligent control system for packer. Based on the integrated structure of the packer and the continuous water extraction without pipes in the water source well in method (I), the STM32F103C8T6 single-chip microcomputer is selected as the central control chip of the intelligent control system 24, and the ultrasonic ranging method is used to measure the liquid level of the water source well. The ADC and DAC converters of the selected STM32F103C8T6 single-chip microcomputer can perform mutual conversion between digital signals and analog signals, thereby realizing data collection and intelligent control in the production process. The ultrasonic ranging system consists of eight functional modules, namely, an ultrasonic transmitting module, an ultrasonic receiving module, a power module, a button control module, a display module, a communication module, a temperature acquisition unit, and a register module. The power module provides stable current and voltage, the button control module controls the switch of the ultrasonic ranging function, the temperature acquisition module measures the ambient temperature in real time, and transmits the temperature data to the STM32 microcontroller through the communication module. During the ultrasonic ranging process, the low-voltage pulse signal emitted by the STM32 microcontroller is converted into an ultrasonic signal by the ultrasonic transmitting module 20, and the ultrasonic receiving module 20 receives the echo reflected by the liquid surface, and converts and shapes the sound signal into an electrical signal recognizable by the microcontroller, calculates the distance, and displays the value. A quantitative water collection control system is constructed by using a flow sensor 21, a power module, a button control module, a display module, a communication module, a register module and a drive unit. The quantitative water collection is turned on and the water supply demand is input through the button control module. The flow sensor 21 measures the cumulative flow flowing through the water outlet pipeline 22. The communication module transmits the cumulative flow data to the STM32 microcontroller. The deviation value between the water supply demand and the cumulative flow of the water outlet pipeline is input into the intelligent algorithm for calculation. The calculated value is used as a control signal to control the drive unit, and the operating power of the submersible pump 5 in the water supply process is controlled in real time to achieve quantitative water collection.

[0043] (III) Water well liquid level measurement based on pulse echo measurement method. The ultrasonic signal transmitting module and receiving module 20 are fixed to the lower bottom of the packer housing 6, and the intelligent control system 24 is set at the wellhead of the water well. During the water well liquid level measurement process, the ultrasonic transmitting module 20 transmits ultrasonic pulses, and the ultrasonic receiving module 20 receives the echo reflected by the liquid surface. The signal is converted and shaped and then transmitted to the intelligent control system 24 for calculation. According to the time from the emission to the reception of the ultrasonic pulse, combined with the propagation speed of the ultrasonic wave at the ambient temperature, the distance between the water well liquid level and the ultrasonic sensor is obtained. According to formula (1), the distance between the ultrasonic transmitting module, the receiving module 20 and the measured liquid surface can be obtained:

[0044]

[0045] Where S is the distance between the ultrasonic emission position and the measured liquid surface, m; C is the sound speed in the current environment, m / s; t1+t2+t3+...+t nMeasure the timing of N round trips to the same location, s.

[0046] Considering that changes in temperature and air pressure will affect the speed of sound in the air as the measurement environment changes, temperature compensation is added to reduce the difference in speed of sound caused by different environments. The expression of the speed of sound in a stable environment is:

[0047] C=331.45+0.607T(2)

[0048] Where T is the thermodynamic temperature, K.

[0049] (IV) Implementation of the setting, disassembly and intelligent installation of the packer. Start the submersible pump 5 when the packer drain valve 8 is closed. Water can flow into the packer rubber barrel from the outlet hole 18 of the packer center tube 4. The rubber barrel 19 expands outward under the action of hydraulic pressure until it comes into direct contact with the wellbore casing 10 of the water source well. As the pressure in the packer continues to increase, the rubber barrel 19 comes into close contact with the casing, separating the water source well into the submersible pump water collection part and the water collection and discharge part, thereby achieving the setting of the packer. The packer is installed with a detachable rigid rod, which is connected to the trigger device 16 of the packer. During the installation of the packer, the fixed position of the packer can be determined by measuring the distance between the packer and the liquid level of the water source well according to the above scheme (III), thereby achieving intelligent installation. After the packer 1 reaches the fixed position, the submersible pump 5 is started at low power with the drain valve 8 closed. After the packer is set, the rigid rod is pressed down to trigger the trigger device 16, and the packer 1 and the submersible pump 5 are fixed in the well through the stop hinge 12 and the slip 7, and then the rigid rod is taken out. At this time, the packer drain valve 8 is opened, and the submersible pump draws water into the discharge part of the water source well. When the submersible pump 5 stops running, the water pressure in the wellbore casing 10 sets the packer. If the fixed position of the packer 1 needs to be moved or the packer needs to be disassembled, the hydraulic pressure in the packer needs to be removed, and the packer is unsealed after the rubber barrel 19 is deformed and restored, and can be moved or disassembled.

[0050] (V) Realize quantitative water collection from water source wells based on PID algorithm. Realize quantitative water collection from water source wells based on PID algorithm. The flow sensor 21, intelligent control system 24, frequency converter 23, submersible pump 5 and asynchronous motor driving the submersible pump together form a closed-loop control system. The cumulative flow data measured by the flow sensor and the ultrasonic signal received by the ultrasonic receiving module are converted into 4-20mA electrical signals and input into the intelligent control system. The frequency converter controls the speed of the asynchronous motor by changing the output voltage and frequency of the power supply, thereby controlling the operating power of the submersible pump. The quantitative water collection is turned on by the key control module, and the water supply demand is input. The flow sensor 21 detects the cumulative flow flowing through the outlet pipeline 22. The deviation between the water supply demand and the cumulative flow of the outlet pipeline is used as the input value of the PID algorithm for calculation. The output signal after calculation is the control signal of the frequency converter 23. The output power of the asynchronous motor is dynamically adjusted by the frequency converter, thereby controlling the operating power of the submersible pump 5 in the water supply process in real time to realize quantitative water collection from the water source well. In the PID algorithm, the deviation between the set value and the actual output value is calculated in proportion, integration and differentiation, and its continuous form is:

[0051]

[0052] In the formula, K p is the proportional gain coefficient; T i is the integration time constant; T d is the differential time constant; e(t) is the deviation, e(t)=(SP-PV), SP is the set value, PV is the output value.

[0053] Considering that the STM32 microcontroller can only calculate the control quantity based on the deviation at the sampling time, the PID algorithm needs to be discretized. Take T as the sampling period, k as the sampling sequence number, use the rectangular method numerical integration to approximate the integral, and use the first-order backward difference to approximate the differential, and make the following approximate transformation:

[0054]

[0055] Substituting equations (4) and (5) into equation (3), we get the discretized PID algorithm expression:

[0056]

[0057] In order to enhance the stability and anti-interference ability of the PID algorithm and reduce the influence of the system sampling cycle on the control, the difference between the control quantity at the current moment and the control quantity at the previous moment is made, and the increment is the new control quantity. The incremental discrete mathematical model is:

[0058] Δu(k)=u(k)-u(k-1)(7)

[0059] From formula (6), the output value at the k-1th sampling time is:

[0060]

[0061] By subtracting and arranging equation (6) and equation (8), we can get the incremental PID algorithm model:

[0062]

[0063] In the formula, Δu(k) is the PID output increment value; P is the proportional coefficient; I is the integral coefficient; D is the differential coefficient; P, I, and D are all decimals between 0 and 1.

[0064] The simplified incremental mathematical model is a dimensionless expression, in which the deviation e = SP-PV is dimensional, and the deviation is transformed as follows:

[0065]

[0066] Substituting equation (10) into equation (9), we get the dimensionless form of the incremental PID algorithm, which is:

[0067] Δu(k)%=PΔe(k)%+Ie(k)%+D[Δe(k)%-Δe(k-1)%],Δu k %∈(0,1) (11)

[0068] Δu(k)% serves as the input signal of the frequency converter 23 to regulate the output power of the asynchronous motor, and its size determines the operating power of the submersible pump 5. When Δu(k)%=1, the submersible pump 5 operates at full power, and when Δu(k)%=0, the accumulated flow through the outlet pipeline 22 is equal to the water supply demand, and the submersible pump 5 stops running.

[0069] Therefore, whether it is water injection in the oil field or preparation of chemical mother liquor in oil field production, quantitative water extraction can be started by pressing the button control module and the water supply demand can be input, so as to realize intelligent quantitative water extraction under unmanned conditions.

[0070] Aiming at the structure of the traditional water source well water extraction device in the oil field and its lack of intelligence, an intelligent packer for continuous water extraction without pipe in the water source well is designed to realize continuous water extraction without pipe by replacing the water pumping pipe with the well casing, and a corresponding intelligent packer control method is established to realize dynamic monitoring of the liquid level of the water source well and quantitative water extraction according to the water supply demand. For oil fields that use water drive and chemical drive for oil production, the present invention provides a beneficial way to reduce the construction cost of water source wells and promote the intelligent production and operation of the injection and production system of oil field development.

Claims

1. A tubeless continuous water extraction intelligent packer device for a water source well, characterized by: This tubeless continuous water extraction intelligent packer device for water source wells includes a packer, a trigger device, a submersible pump, a flow sensor, an ultrasonic transmitting / receiving module, and an intelligent control system. The trigger device is located in the wellbore casing, and the trigger device is a variable diameter rotary body. The lower end of the trigger device is fixedly connected to a transmission rod, and the lower end of the transmission rod is connected to a drain valve. The drain valve is located in the packer cavity. A transmission rod hole is provided at the top center of the packer shell, and fan-shaped drainage holes are evenly arranged circumferentially outside the transmission rod hole. The valve plate of the drain valve is formed by fan blades evenly arranged along the circumference. The drain valve is used to open or close the fan-shaped Drainage hole; a symmetrical stop hinge is installed on the upper end of the transmission rod, the double-arm lever is hinged to the upper end of the symmetrical stop hinge, and a pair of slips are hinged at the lower end of the symmetrical stop hinge. A sliding roller is fixed to the upper end of the double-arm lever, and the sliding roller rolls up and down along the inner wall of the wellbore casing. The slips are used to be clamped on the wellbore casing; the lower end of the center tube of the packer is fixedly connected to the discharge nozzle of the submersible pump, the submersible pump is connected to the frequency converter on the ground, the frequency converter is connected to the intelligent control system, the upper end of the wellbore casing is connected to the water outlet pipeline, a flow sensor is arranged on the water outlet pipeline, and an ultrasonic transmitting / receiving module is arranged under the packer.

2. The tubeless continuous water extraction intelligent packer device for water source wells according to claim 1 is characterized in that: A double-arm lever limit plate is provided at the upper end of the transmission rod, one side of the bottom end of the double-arm lever is clamped on the double-arm lever limit plate, and the other side of the bottom end of the double-arm lever is hinged to the stop hinge; the transmission rod is also provided with a stop hinge seat, the stop hinge seat is located below the double-arm lever limit plate, the stop hinge is installed through the stop hinge seat, and the top angle of the cava side is clamped under the bottom surface of the stop hinge seat.

3. The tubeless continuous water extraction intelligent packer device for water source wells according to claim 2 is characterized in that: The packer consists of an upper packer and a lower packer. The rubber barrel of each packer is fixed by the packer shell. The rubber barrel and the packer cavity are connected through the packer center tube. A center hole is provided at the bottom of the inner cavity of the upper packer. The saddle with a hole naturally sits on the center hole. The lower end of the saddle with a hole extends into the cavity of the lower packer. The ultrasonic transmitting / receiving module is provided under the bottom surface of the lower packer.

4. A quantitative water extraction method using the tubeless continuous water extraction intelligent packer device for a water source well according to claim 3, characterized in that: The intelligent control system adopts STM32F103C8T6 single-chip microcomputer as the central control chip. Its power module, key control module, display module, communication module, temperature acquisition unit, register module and ultrasonic transmitting / receiving module constitute an ultrasonic ranging system. The distance between the ultrasonic transmitting module, the receiving module and the measured liquid surface is: Where S is the distance between the ultrasonic emission position and the measured liquid surface, m; C is the sound speed in the current environment, m / s; t1+t2+t3+...+t n The timing of measuring N round trips to the same position, s; The expression for the speed of sound is: C=331.45+0.607T (2) Where, T is the thermodynamic temperature, K; The intelligent control system constructs a quantitative water collection control system through its power module, key control module, display module, communication module, register module, drive unit and flow sensor. The quantitative water collection is turned on and the water supply demand is input through the key control module. The flow sensor measures the cumulative flow through the outlet pipeline. The communication module transmits the cumulative flow data to the STM32 microcontroller. The deviation value between the water supply demand and the cumulative flow of the outlet pipeline is input into the intelligent algorithm for calculation. The calculated value is used as a control signal to control the drive unit, and the operating power of the submersible pump in the water supply process is controlled in real time to achieve quantitative water collection. Δu(k)%=PΔe(k)%+Ie(k)%+D[Δe(k)%-Δe(k-1)%],Δu k %∈(0,1) (11) Δu(k)% is the input signal of the frequency converter to control the output power of the asynchronous motor. Its size determines the operating power of the submersible pump. When Δu(k)%=1, the submersible pump runs at full power; when Δu(k)%=0, the cumulative flow through the outlet pipeline is equal to the water supply demand, and the submersible pump stops running; Δu(k) is the PID output increment value; P is the proportionality coefficient; I is the integral coefficient; D is the differential coefficient; P, I, and D are all decimals between 0 and 1; k is the sampling number; e is the deviation; Start quantitative water collection through the button control module, and input the water supply demand, so as to realize intelligent quantitative water collection without human control.

5. The quantitative water sampling method according to claim 4, characterized in that: The STM32F103C8T6 single-chip microcomputer has built-in ADC and DAC converters to perform mutual conversion between digital signals and analog signals, thereby realizing data collection and intelligent control in the production process.

6. The quantitative water sampling method according to claim 5, characterized in that: The accumulated flow data measured by the flow sensor and the ultrasonic signal received by the ultrasonic receiving module are both converted into 4-20mA electrical signals and input into the intelligent control system.

7. The quantitative water sampling method according to claim 6, characterized in that: The packer adopts a double rubber barrel combined structure, the maximum outer diameter of the rubber barrel is selected according to the diameter of the wellbore casing, and the outward inclination angle of the rubber barrel is 45°.

8. The quantitative water sampling method according to claim 7, characterized in that: The diameter of the water outlet hole connecting the center tube of the packer and the rubber barrel is 10mm.

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