An oil reservoir flow regulator injection system, a control method thereof, and a storage medium

Abstract

This disclosure provides a reservoir flow regulating agent injection system and its control method and storage medium, relating to the field of injection equipment. The system includes a central control module, a screw conveyor feeding module, a skid-mounted mixing tank module, and a high-pressure flow regulating pump skid-mounted module. The screw conveyor feeding module includes a shaftless screw conveyor, a discharge hopper, and a frequency converter. The skid-mounted mixing tank module includes a tank body, a mixing module, and a signal acquisition module. The signal acquisition module includes a level sensor and an online viscometer installed on the tank body. This reservoir flow regulating agent injection system achieves fully automated operation of the flow regulating agent from raw material transportation to high-pressure injection.

Description

Technical Field

[0001] This disclosure relates to the field of injection equipment technology, and in particular to an oil reservoir flow regulating agent injection system and its control method and storage medium. Background Technology

[0002] During water injection development in oilfields, due to reservoir heterogeneity (such as permeability differences, natural fracture development, and cavern distribution), injected fluids are prone to cross-flow along high-permeability zones or dominant seepage channels. This results in the injected fluid being produced from production wells without sufficient displacement reaction with the crude oil in the reservoir, leading to inefficient circulation. This phenomenon not only reduces the sweep efficiency of the injected fluid but also severely restricts reservoir recovery. To solve this problem, a special flow modifier is typically injected into the formation to block or partially block dominant seepage channels, forcing subsequent injected fluids to divert to low-permeability oil-bearing areas, thereby expanding the swept volume of the injected fluid and improving reservoir recovery.

[0003] To adapt to more complex geological conditions and achieve deeper sealing effects, various specialty particulate flow modifiers are being used gradually. Existing conventional injection systems are insufficient to meet the technical requirements for the injection of specialty particulate flow modifiers. Summary of the Invention

[0004] This disclosure provides a reservoir flow control agent injection system and its control method and storage medium to at least solve the above-mentioned technical problems existing in the prior art.

[0005] According to a first aspect of this disclosure, a reservoir flow regulating agent injection system is provided. The system includes a central control module, a screw conveyor feeding module, a skid-mounted mixing tank module, and a high-pressure flow regulating pump skid-mounted module. The screw conveyor feeding module includes a shaftless screw conveyor, a discharge hopper, and a frequency converter. The skid-mounted mixing tank module includes a tank body, a mixing module, and a signal acquisition module. The signal acquisition module includes a level sensor and an online viscometer mounted on the tank body.

[0006] The central control module is used to: acquire the real-time viscosity value of the working fluid fed back by the online viscometer, compare the real-time viscosity value with the target viscosity value to obtain the current viscosity deviation value; based on the current viscosity deviation value, obtain a frequency control signal through a PID algorithm and send it to the variable frequency drive; acquire the real-time liquid level value of the working fluid fed back by the liquid level sensor, compare the real-time liquid level value with the safety critical liquid level threshold, and if the real-time liquid level value is lower than the safety critical liquid level threshold, generate a forced shutdown command and send it to the high-pressure flow regulating pump skid module;

[0007] The feeding hopper is used to receive solid particle flow regulator, and the frequency converter is used to adjust the operating frequency of the shaftless screw conveyor based on the frequency control signal to transport the solid particle flow regulator to the skid-mounted mixing tank module.

[0008] The skid-mounted mixing tank module is used to mix the received solid particle flow regulator and carrier liquid through the mixing module to obtain the working liquid;

[0009] The high-pressure flow regulating pump skid module is used to inject the working fluid into the target formation in response to the absence of the forced shutdown command.

[0010] In one embodiment, the high-pressure flow regulating pump skid module includes at least two high-pressure injection pumps connected in parallel;

[0011] The central control module is also used to determine the rated displacement of the high-pressure injection pump, and based on the rated displacement and the target displacement, to determine which high-pressure injection pump will enter the operating state among at least two high-pressure injection pumps.

[0012] In one embodiment, the online viscometer is a tuning fork viscometer or a rotational viscometer. The online viscometer is installed in the slurry outlet pipeline of the skid-mounted mixing tank module and is located before the liquid inlet of the high-pressure flow regulating pump skid-mounted module. It is used to detect the real-time viscosity value of the working fluid after being stirred by the mixing module.

[0013] In one possible embodiment, the skid-mounted mixing tank module further includes an electrically controlled regulating valve;

[0014] The central control module is also used to compare the real-time liquid level value with a low liquid level threshold and a safety critical liquid level threshold; if the real-time liquid level value is lower than the low liquid level threshold and higher than the safety critical liquid level threshold, then generate an opening command for the electronically controlled regulating valve and a start command for the screw conveyor feeding module.

[0015] The electronically controlled regulating valve responds to the opening command and inputs the carrier liquid into the tank body of the skid-mounted mixing tank module;

[0016] The variable frequency drive responds to the start command and controls the shaftless screw conveyor to start running at the initial speed.

[0017] In one embodiment, the system further includes an operation interaction module for receiving control parameters input by the user; the control parameters include the target viscosity value of the working fluid, the safety critical liquid level threshold, and PID control parameters.

[0018] According to a second aspect of this disclosure, a control method for an oil reservoir flow regulating agent injection system is provided. The system includes a central control module, a spiral lifting and feeding module, a skid-mounted mixing tank module, and a high-pressure flow regulating pump skid-mounted module. The spiral lifting and feeding module includes a shaftless spiral lift, a discharge hopper, and a frequency converter. The skid-mounted mixing tank module includes a tank body, a mixing module, and a signal acquisition module. The signal acquisition module includes a level sensor and an online viscometer mounted on the tank body. The method includes:

[0019] The central control module acquires the real-time viscosity value of the working fluid from the online viscometer, compares the real-time viscosity value with the target viscosity value to obtain the current viscosity deviation value, and generates a frequency control signal based on the current viscosity deviation value using a PID algorithm, which is then sent to the variable frequency drive. The module also acquires the real-time liquid level value of the working fluid from the level sensor, compares the real-time liquid level value with a safety critical liquid level threshold, and generates a forced shutdown command if the real-time liquid level value is lower than the safety critical liquid level threshold, which is then sent to the high-pressure flow regulating pump skid module.

[0020] Solid particle flow modifier is received through the feeding funnel;

[0021] The variable frequency drive adjusts the operating speed of the shaftless screw conveyor based on the frequency control signal to transport the solid particle flow regulator to the skid-mounted mixing tank module.

[0022] The received solid particle flow regulator and carrier liquid are stirred and mixed by the stirring and mixing module of the skid-mounted mixing tank module to obtain the working liquid;

[0023] If the forced shutdown command is not received, the working fluid is injected into the target formation through the high-pressure flow regulating pump skid module.

[0024] In one possible implementation, obtaining the frequency control signal based on the current viscosity deviation value using a PID algorithm includes:

[0025] Obtain historical viscosity deviation values;

[0026] Based on the current viscosity deviation value, the historical viscosity deviation value, and the rate of change of viscosity deviation, the frequency adjustment increment of the variable frequency drive is determined;

[0027] Based on the frequency adjustment increment and the current operating frequency, a frequency control signal is obtained.

[0028] According to a third aspect of this disclosure, a non-transitory computer-readable storage medium is provided storing computer instructions for causing a computer to perform the methods described in this disclosure.

[0029] This disclosure discloses a reservoir flow modifier injection system, its control method, and storage medium. By integrating real-time feedback data from a liquid level sensor and an online viscometer through a central control module, and using a PID algorithm to dynamically adjust the operating frequency of the spiral lifting feed module, the system precisely maintains the stability of the working fluid viscosity. At the same time, it relies on a safety critical liquid level protection mechanism to ensure the safe operation of the high-pressure flow modifier skid-mounted module. This achieves automated and precise operation of flow modifier preparation and injection, adapting to different working conditions while effectively improving reservoir profile control, flood control, and oil recovery.

[0030] It should be understood that the description in this section is not intended to identify key or essential features of the embodiments of this disclosure, nor is it intended to limit the scope of this disclosure. Other features of this disclosure will become readily apparent from the following description. Attached Figure Description

[0031] The above and other objects, features, and advantages of this disclosure will become readily apparent from the following detailed description of exemplary embodiments, taken in conjunction with the accompanying drawings. Several embodiments of this disclosure are illustrated in the drawings by way of example and not limitation, in which:

[0032] In the accompanying drawings, the same or corresponding reference numerals indicate the same or corresponding parts.

[0033] Figure 1 A schematic diagram of the composition and structure of a reservoir flow control agent injection system according to an embodiment of the present disclosure is shown;

[0034] Figure 2 A schematic diagram illustrating the implementation flow of a control method for a reservoir flow regulating agent injection system according to an embodiment of the present disclosure is shown.

[0035] Figure 3 A schematic diagram of the composition structure of an electronic device according to an embodiment of the present disclosure is shown. Detailed Implementation

[0036] To make the objectives, features, and advantages of this disclosure more apparent and understandable, the technical solutions in the embodiments of this disclosure will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only a part of the embodiments of this disclosure, and not all of them. All other embodiments obtained by those skilled in the art based on the embodiments of this disclosure without creative effort are within the scope of protection of this disclosure.

[0037] A first aspect of this disclosure provides a reservoir flow regulating agent injection system, such as... Figure 1As shown, the system includes a central control module, a screw conveyor feeding module, a skid-mounted mixing tank module, and a high-pressure flow regulating pump skid-mounted module. The screw conveyor feeding module includes a shaftless screw conveyor, a discharge hopper, and a frequency converter. The skid-mounted mixing tank module includes a tank body, a mixing module, and a signal acquisition module. The signal acquisition module includes a liquid level sensor and an online viscometer installed on the tank body.

[0038] The central control module is used to: acquire the real-time viscosity value of the working fluid fed back by the online viscometer, compare the real-time viscosity value with the target viscosity value to obtain the current viscosity deviation value; based on the current viscosity deviation value, obtain a frequency control signal through a PID algorithm and send it to the variable frequency drive; acquire the real-time liquid level value of the working fluid fed back by the liquid level sensor, compare the real-time liquid level value with the safety critical liquid level threshold, and if the real-time liquid level value is lower than the safety critical liquid level threshold, generate a forced shutdown command and send it to the high-pressure flow regulating pump skid module;

[0039] The feeding hopper is used to receive solid particle flow regulator, and the frequency converter is used to adjust the operating frequency of the shaftless screw conveyor based on the frequency control signal to transport the solid particle flow regulator to the skid-mounted mixing tank module.

[0040] The skid-mounted mixing tank module is used to mix the received solid particle flow regulator and carrier liquid through the mixing module to obtain the working liquid;

[0041] The high-pressure flow regulating pump skid module is used to inject the working fluid into the target formation in response to the absence of the forced shutdown command.

[0042] The specific explanations of each module are as follows:

[0043] Solid particulate flow modifiers are solid granular materials used to seal dominant seepage channels in oil reservoirs, initially stored in a surface storage device. The discharge hopper features an anti-caking and anti-clogging design, and its volume can be determined based on the on-site single storage requirements and feeding frequency of the solid particulate flow modifiers (e.g., 200L), providing a continuous and stable supply of raw materials to the shaftless screw conveyor. Simultaneously, the discharge hopper directly connects to the surface storage device to receive the solid particulate flow modifiers, effectively preventing spillage or contamination during transport. A variable frequency drive (VFD) serves as the speed control unit for the screw conveyor feeding module, electrically connected to the drive motor of the shaftless screw conveyor. Upon receiving a frequency control signal from the central control module, it drives the shaftless screw conveyor according to the specified operating frequency, thereby transporting the solid particulate flow modifiers from the surface storage location to the skid-mounted mixing tank module.

[0044] The skid-mounted mixing tank module is the core unit for working fluid preparation, mainly consisting of the tank body, a mixing module, and a signal acquisition module. The signal acquisition module comprises a level sensor and an online viscometer mounted on the tank body. The tank body preferably adopts a regular square tank structure (e.g., a square tank with a nominal volume of 12m³ and an effective volume of 10m³). This structure not only significantly improves the space utilization during on-site installation but also guides the mixing blades to form a uniform flow field without dead zones, effectively preventing solid particle deposition within the tank. During operation, the skid-mounted mixing tank module simultaneously receives carrier fluid (such as oilfield reinjection water) from external supply pipelines and solid particle flow modifier from the screw-lift feeding module. The mixing module (e.g., a vertical mixer paired with a 30° downward-pressing flat impeller) thoroughly mixes both. Through agitation, the solid particles are ensured to be uniformly dispersed and continuously suspended in the carrier fluid, preventing particle sedimentation and ultimately forming a homogenized working fluid that meets the reservoir injection requirements.

[0045] The level sensor in the signal acquisition module detects the real-time level of the working fluid in the skid-mounted mixing tank. This real-time level directly reflects the actual amount of working fluid in the tank, providing data support for level control and safety protection. The level sensor is preferably installed in the upper-middle area of ​​the side wall of the skid-mounted mixing tank to accommodate monitoring needs in different level ranges. Specifically, a diaphragm-type single-flange level gauge can be used. This type of level gauge, with its single-flange structure, fits tightly against the tank side wall, effectively avoiding wear and blockage by solid particles in the slurry, ensuring measurement stability. The measured level data is converted into an analog signal and transmitted to the central control module in real time. The online viscometer is preferably installed in the slurry outlet pipeline of the skid-mounted mixing tank module to detect the viscosity of the working fluid after thorough mixing by the mixing module, ensuring that the detection data accurately reflects the quality status of the working fluid ultimately injected into the reservoir.

[0046] The central control module serves as the core control hub of the system, possessing multi-dimensional data processing, logical judgment, and command issuance capabilities. It coordinates the collaborative operation of various modules: On one hand, the central control module acquires the real-time viscosity value of the working fluid from the online viscometer, compares it with the preset target viscosity value to calculate the current viscosity deviation, and then generates a frequency control signal based on this deviation value using a PID (proportional-integral-derivative) closed-loop control algorithm, sending it to the variable frequency drive. The variable frequency drive adjusts the operating frequency of the shaftless screw conveyor according to this signal, thereby controlling the conveying rate of the solid particle flow regulator and achieving dynamic and precise control of the working fluid viscosity. On the other hand, the central control module acquires the real-time liquid level value of the working fluid from the level sensor, compares it with the preset safety critical liquid level threshold (the safety critical liquid level threshold represents the minimum working fluid level required for the safe operation of the high-pressure flow regulator pump; below this threshold, the pump is prone to dry running and damage); if the real-time liquid level value is lower than the safety critical liquid level threshold, a forced shutdown command is immediately generated and sent to the high-pressure flow regulator pump skid-mounted module. The high-pressure flow regulating pump skid module stops operating immediately upon receiving a forced shutdown command; otherwise, it normally injects the homogenizing working fluid into the target formation.

[0047] The high-pressure regulating pump skid module serves as the system's power delivery unit, providing stable high-pressure power for the injection of the working fluid. It is responsible for delivering the homogenized working fluid prepared by the skid-mounted mixing tank module to the target oil reservoir at a preset pressure and flow rate, ensuring the smooth progress of the injection operation.

[0048] The reservoir flow regulating agent injection system in this embodiment achieves fully automated control of the entire process of solid particulate flow regulating agent injection, from raw material transportation and working fluid mixing and preparation to high-pressure injection, through the close coordination of the central control module, the spiral lifting and feeding module, the skid-mounted mixing tank module, and the high-pressure flow regulating pump skid-mounted module. It not only ensures the precise and stable viscosity of the working fluid through the PID closed-loop algorithm, thus ensuring the profile control and displacement effect, but also eliminates the risk of high-pressure pump idling damage through the liquid level interlock protection mechanism, effectively improving the efficiency, safety, and reliability of reservoir flow regulating agent injection operations.

[0049] In another embodiment of this disclosure, the high-pressure flow regulating pump skid module includes at least two high-pressure injection pumps arranged in parallel; the central control module is further configured to determine the rated displacement of the high-pressure injection pump, and based on the rated displacement and the target displacement, determine the high-pressure injection pump that enters the operating state among the at least two high-pressure injection pumps.

[0050] The high-pressure flow regulating pump skid module is equipped with at least two high-pressure injection pumps of the same specifications, preferably hydraulically controlled high-pressure flow regulating injection pumps. This type of pump features stable pressure output and high displacement adjustment accuracy, precisely adapting to the operational requirements of reservoir flow regulating agent injection. Multiple high-pressure injection pumps are designed in parallel, flexibly enabling two core modes: redundancy operation and parallel capacity expansion operation. The central control module first determines the rated displacement of a single high-pressure injection pump. If the target displacement is less than or equal to the rated displacement of a single pump, only one high-pressure injection pump is started as the main pump, while the other pump remains in standby mode. When the main pump fails, the standby pump automatically switches to operation, ensuring continuous and uninterrupted injection operations. If the target displacement is greater than the rated displacement of a single pump, multiple high-pressure injection pumps are started simultaneously in parallel, with flow rate superposition to match higher operational displacement requirements. Each high-pressure injection pump independently responds to the control commands of the central control module. Based on the start / stop signals and target displacement parameters in the commands, the pump's operating status is precisely adjusted to deliver the homogenized working fluid to be injected to the target formation at a stable pressure and set flow rate.

[0051] In another embodiment of this disclosure, the online viscometer is a tuning fork viscometer or a rotational viscometer. The online viscometer is installed in the slurry outlet pipeline of the skid-mounted mixing tank module and is located before the liquid inlet of the high-pressure flow regulating pump skid-mounted module. It is used to detect the real-time viscosity value of the working fluid after being stirred by the mixing module.

[0052] The online viscometer is preferably installed on the outlet pipeline of the skid-mounted mixing tank module, between the skid-mounted mixing tank module and the high-pressure regulating pump skid-mounted module (i.e., before the inlet of the high-pressure regulating pump skid-mounted module). The advantage of this installation location is that the working fluid being measured has been thoroughly mixed, accurately reflecting the viscosity state of the working fluid ultimately injected into the reservoir. This ensures the accuracy and representativeness of the measured data, providing a reliable basis for the control module's regulatory decisions.

[0053] For online viscometers, either a tuning fork viscometer or a rotational viscometer can be selected. Both are suitable for different operating conditions and can meet the accuracy requirements. The tuning fork viscometer calculates the viscosity value by detecting changes in the vibration frequency of the tuning fork in the working fluid. It has strong anti-interference capabilities and is particularly suitable for detecting flow-regulating agent slurries with high particle content. The rotational viscometer measures viscosity by sensing changes in the resistance experienced by the rotating blade in the working fluid. It has higher measurement accuracy and is suitable for scenarios with more stringent viscosity control requirements. Both types of online viscometers can feed back the real-time detected working fluid viscosity value to the central control module in a stable signal form, providing data support for subsequent feed rate adjustment.

[0054] In another embodiment of this disclosure, the skid-mounted mixing tank module further includes an electrically controlled regulating valve; the central control module is further configured to compare the real-time liquid level value with a low liquid level threshold and a safety critical liquid level threshold; if the real-time liquid level value is lower than the low liquid level threshold and higher than the safety critical liquid level threshold, then generate an opening command for the electrically controlled regulating valve and a start command for the screw conveyor feeding module; the electrically controlled regulating valve responds to the opening command by inputting carry liquid into the tank body of the skid-mounted mixing tank module; the variable frequency drive responds to the start command by controlling the shaftless screw conveyor to start operation at an initial speed.

[0055] The skid-mounted mixing tank module is also equipped with an electrically controlled regulating valve. This valve connects the external liquid supply line to the tank body of the skid-mounted mixing tank and is an actuator that controls the input of the carrier liquid. It is used to adjust the start and stop of the injection of the carrier liquid according to the instructions of the central control module to ensure the stability of the liquid level of the working liquid in the skid-mounted mixing tank.

[0056] Among them, the low liquid level threshold represents the warning liquid level in the skid-mounted mixing tank that needs to be replenished with carrier liquid and solid particle flow regulating agent. When the working fluid level is lower than this threshold, the feeding and replenishment process needs to be started. The safety critical liquid level threshold is the minimum liquid level to ensure the safe operation of the high-pressure flow regulating pump. If it is lower than this threshold, the pump body will run dry and be damaged, and the shutdown protection needs to be triggered.

[0057] After the central control module acquires the real-time liquid level value of the working fluid from the liquid level sensor, it compares it with the preset low liquid level threshold and the safety critical liquid level threshold. If the real-time liquid level value is lower than the low liquid level threshold but higher than the safety critical liquid level threshold, it indicates that the liquid level in the tank is insufficient but has not yet reached the safety risk threshold. At this time, the central control module will simultaneously generate an opening command for the electronically controlled regulating valve and a start command for the screw conveyor feeding module: the electronically controlled regulating valve responds to the opening command and inputs the carrier liquid into the tank body; the variable frequency speed controller of the screw conveyor feeding module responds to the start command and controls the shaftless screw conveyor to start running at a preset initial speed, delivering solid particle flow regulator into the tank body, realizing the synchronous replenishment of the carrier liquid and flow regulator, and ensuring the continuous operation of the working fluid preparation process.

[0058] In another embodiment of this disclosure, the system further includes an operation interaction module for receiving control parameters input by a user; the control parameters include the target viscosity value of the working fluid, the safety critical liquid level threshold, and PID control parameters.

[0059] Specifically, the core of this operation interaction module is equipped with a Human Machine Interface (HMI), providing operators with an intuitive and convenient entry point for parameter input and system monitoring. Operators can use this HMI to set and input various control parameters, which will then be synchronized to the central control module as the core basis for the system's automated operation and control.

[0060] The required control parameters include at least the target viscosity value of the working fluid, the critical safety level threshold, and PID control parameters. The definitions and functions of each parameter are as follows: The target viscosity value is a preset standard for the qualified viscosity of the working fluid based on the geological conditions of the target reservoir and the requirements for profile control and drive adjustment. It is the core benchmark for the central control module to determine whether the working fluid viscosity meets the standard and thus adjust the feeding rate. The critical safety level threshold is the minimum liquid level limit to ensure the safe operation of the high-pressure flow regulating pump skid module. If it is lower than this threshold, the pump body will run dry and wear. Therefore, this parameter is the key basis for the central control module to trigger the high-pressure pump forced shutdown protection. The PID control parameters are used to set the adjustment logic of the PID closed-loop control algorithm, which directly affects the correction speed of viscosity deviation, adjustment accuracy, and system stability. It can be flexibly adjusted by the operator according to the on-site working conditions (such as the particle size and concentration of the flow regulating agent).

[0061] In another possible implementation, in addition to the aforementioned target viscosity value of the working fluid (P1) and the safety critical liquid level threshold (P4, for example, 1.5 m³, corresponding to 15% of the effective volume), the control parameters also include the following key parameters: P2, the high liquid level threshold (L_high) of the skid-mounted agitator, which represents the maximum storage limit of the working fluid in the tank. When this threshold is reached, the system stops feeding water, for example, 9.0 m³ (corresponding to 90% of the effective volume); P3, the low liquid level threshold (L_low) of the skid-mounted agitator, which represents the replenishment of the working fluid in the tank. The system automatically starts the feeding and water replenishment process when the volume is below the lower limit, for example, 4.0 m³ (corresponding to 40% of the effective volume); the target displacement value of the high-pressure regulating pump (Q_pump_set) represents the delivery flow rate that the high-pressure pump needs to achieve, matching the displacement requirements of the on-site injection construction, for example, 20 m³ / h; the start and stop liquid level threshold of the agitator (L_stop) represents the minimum liquid level at which the agitator avoids dry stirring, and the agitator automatically stops when the volume is below this threshold, for example, 1.0 m³ (corresponding to 10% of the effective volume).

[0062] In addition to the parameter setting functions mentioned above, this operation interaction module also integrates input ports for operation commands such as operating mode selection, system start / stop, and pump start / stop commands. Specific functions are as follows: The operating mode selection function allows operators to select the system operating mode on the human-machine interface, including but not limited to fully automatic mode; after selecting fully automatic mode, the system will autonomously complete the entire process of flow regulating agent raw material delivery, homogenization mixing, and high-pressure injection according to preset control logic. The system start / stop command allows operators to trigger the central control module to complete initialization and start the entire system operation process by clicking the system start button on the human-machine interface; or to trigger the central control module to execute a safety shutdown sequence by clicking the system stop button. The execution of the pump start / stop command must meet preset safety conditions: when the working fluid level in the skid-mounted mixing tank is higher than the safety critical level threshold of the high-pressure flow regulating pump, the operator can issue a start / stop control command for the high-pressure pump through the start or stop pump buttons on the human-machine interface according to the on-site construction progress; if the liquid level is lower than this threshold, the pump start / stop command automatically becomes invalid, and the system forcibly locks the start permission of the high-pressure pump to prevent equipment idling damage.

[0063] To facilitate a better understanding of the above embodiments, the following example uses a Programmable Logic Controller (PLC) as the core control unit:

[0064] In this example, the central control module is equipped with analog input (AI), analog output (AO), digital input (DI), and digital output (DO) modules to control the screw conveyor feeding module, the skid-mounted mixing tank module, and the high-pressure flow regulating pump skid-mounted module.

[0065] Specifically, in the screw conveyor feeding module, the digital output (DO) module of the central control module is connected to the start / stop control terminal of the variable frequency drive of the screw conveyor feeding module through a relay to realize the start / stop control of the screw conveyor feeding module; the analog output (AO) is connected to the analog input terminal of the variable frequency drive to transmit the frequency control signal to the variable frequency drive, thereby controlling the operating speed of the variable frequency drive and thus precisely adjusting the feeding speed.

[0066] In the skid-mounted mixing tank module, its level sensor and online viscometer are connected to the analog input (AI) module of the central control module to transmit the real-time viscosity and level values ​​of the working fluid, serving as the core feedback basis for the system's closed-loop control. The electrically controlled regulating valve and the mixing module are respectively connected to different relay terminals of the digital output (DO) of the central control module to execute corresponding opening / closing or start / stop actions.

[0067] In the high-pressure regulating pump skid module, its displacement control interface is connected to the analog output (AO) module of the central control module to receive analog signals to control the pump's operating displacement; the high-pressure pump's "start-allow" or "emergency stop" control loop is connected in series with the digital output (DO) module of the central control module. When the PLC disconnects the output signal corresponding to this relay, the high-pressure pump cannot start or will be forcibly stopped immediately, regardless of the operator's operating instructions.

[0068] Based on this system, during actual operation, when the operator presses the system start button, the PLC's internal scan cycle (typically on the millisecond level) continuously loops the control process of "reading input, executing logic, and updating output." The system utilizes PID closed-loop control (logic C) to dynamically adjust the feeding rate based on real-time viscosity feedback, thereby achieving precise automatic control of the working fluid concentration. Simultaneously, it executes the highest-priority safety interlock protection (logic E), which continuously monitors the tank level. Once the level falls below the safety threshold, it will ignore any other instructions and forcibly stop the high-pressure pump, thus absolutely ensuring equipment safety.

[0069] Specifically, the PLC's internal scanning cycle continuously executes the process of "reading input, executing logic, and updating output," including: at the beginning of each cycle, the PLC acquires the real-time liquid level (L) and viscosity (μ) of the current working fluid; based on these real-time input parameters, the PLC begins to sequentially execute preset control logic, specifically including the following logic AE:

[0070] The basic agitator control logic (Logic A) is executed as follows: as long as the PLC determines that the real-time liquid level value (L) is higher than the preset start / stop liquid level threshold (L_stop) of the agitator, it will continuously output the DO signal to drive the agitator to run; otherwise, it will stop the agitator output to prevent the equipment from dry stirring.

[0071] The automatic preparation control logic (Logic B) is executed as follows: When the PLC detects that the real-time liquid level (L) drops below the low liquid level threshold (L_low), it simultaneously sends two DO signals to control the opening of the carrier liquid electronic control valve and the start of the screw lifting feeding module, respectively, to start automatic replenishment of carrier liquid and feeding; when the real-time liquid level (L) rises above the high liquid level threshold (L_high), the PLC automatically outputs a DO signal to close the electronic control regulating valve and stop the screw lifting feeding module, thereby realizing automatic closed-loop control of the liquid level in the tank.

[0072] The process of executing PID closed-loop control (logic C) to dynamically adjust the feeding rate based on real-time viscosity feedback, thereby achieving precise automatic control of the working fluid concentration, specifically refers to the following: During the feeding process of logic B, the concentration closed-loop control logic (logic C) is simultaneously activated; the PLC compares the real-time viscosity value (μ) with the preset target viscosity value (μ_set) in real time, and calculates the current viscosity deviation value (e); the PID function block inside the PLC automatically calculates the control output value (e) based on this current viscosity deviation value (e) and its historical trend (e), and converts it into a standard 4-20mA analog signal, which is sent to the variable frequency drive of the screw conveyor feeding module through the AO module; the variable frequency drive dynamically adjusts the operating speed accordingly, thereby adjusting the feeding rate, to ensure that even when the operating conditions fluctuate, the viscosity (concentration) of the working fluid can be stably maintained near the target viscosity value.

[0073] The PLC executes the pump start / stop control logic (Logic D) in response to operator commands on the human-machine interface (HMI): when the operator presses the "Start Pump" button and the safety interlock of Logic E is not triggered, the PLC reads the preset target pump displacement value (Q_pump_set), converts it into a corresponding 4-20mA analog signal, and sends it to the high-pressure pump control system to make it run at the predetermined displacement; when the operator presses the "Stop Pump" button, the PLC outputs a signal to control the high-pressure pump to stop running.

[0074] The highest priority safety interlock protection (logic E) is executed, meaning the PLC monitors this logic preferentially in each scan cycle. Specifically, regardless of the system's operating state, if the PLC detects that the real-time liquid level (L) has dropped below the pump's critical safety level threshold (L_critical), it will immediately enforce the interlock protection action. Ignoring any other instructions, a 4mA analog signal (corresponding to 0% displacement) is sent to the high-pressure pump control system, and the "start-allowed" control loop of the high-pressure pump is forcibly cut off via the DO module output signal. Simultaneously, a first-level audible and visual alarm is triggered on the human-machine interface (HMI), displaying a message such as "Liquid level too low, pump unit has been interlocked and stopped."

[0075] After all logic calculations (A to E) are completed, the PLC performs an "update all outputs" action in the last step of the scan cycle. This synchronously sends the final states of all calculated AO and DO signals to all physical hardware connection ports (including frequency converters, electronically controlled regulating valves, contactors, and high-pressure pump control systems), completing this control cycle and immediately entering the next "read input" stage. This millisecond-level cyclic control process ensures that the system can respond to changes in operating conditions in real time, automatically coordinate the operation of various functional modules, and always prioritize safety protection.

[0076] The following is a specific example of logic code:

[0077] [Loop Start]

[0078] Read all input (InputScan);

[0079] The PLC reads the real-time viscosity value (L) and real-time liquid level value (μ) of the current working fluid.

[0080] The PLC reads the button status (such as whether "pump start" is pressed) on the human-machine interface (HMI) through the DI module.

[0081] Execute the core control logic (Program Execution)

[0082] Logic A: Stirrer control

[0083] IF L>P6 (L_stop) THEN

[0084] Sending a DO signal (ON) to the agitator contactor: The agitator starts running;

[0085] ELSE

[0086] Send a DO signal (OFF) to the agitator contactor: the agitator stops to prevent dry mixing;

[0087] END IF

[0088] Logic B: Automated preparation control (liquid level closed loop)

[0089] IF L<P3 (L_low) AND L> P6 (L_stop) THEN

[0090] Send DO signal (OPEN) to the carrier fluid control valve: Start introducing carrier fluid;

[0091] Send a DO signal (ON) to the variable frequency speed controller of the screw conveyor feeding module: start feeding;

[0092] (The feeding rate is now controlled by logic C)

[0093] END IF

[0094] IF L>P2 (L_high) THEN

[0095] Send a DO signal (CLOSE) to the electro-hydraulic valve carrying the liquid: stop water intake;

[0096] Send a DO (OFF) signal to the variable frequency speed controller of the screw conveyor feeding module: stop feeding;

[0097] END IF

[0098] Logic C: Concentration closed-loop control (viscosity PID)

[0099] IF (Logic B is in the feeding state) THEN

[0100] Calculate the current viscosity deviation value e = μ_set – μ;

[0101] The PID function block inside the PLC calculates the control output value (e.g., the output frequency of the variable frequency drive = 65.5%) based on the current viscosity deviation value e and its historical trend.

[0102] Convert the control output value to a standard 4-20mA analog signal (e.g., 16.48 mA).

[0103] Send this analog signal to the AO channel of the variable frequency drive (VFD) of the screw conveyor feeding module: the VFD will adjust the speed to 65.5%;

[0104] ELSE (Logic B not added)

[0105] Send a 4mA analog signal (corresponding to 0% speed) to the AO channel of the variable frequency speed controller of the screw conveyor feeding module: the feeding module stops;

[0106] END IF

[0107] Logic D: Pump start / stop control

[0108] IF (HMI "Start Pump" button pressed) AND (Logic E's safety interlock not triggered) THEN

[0109] Read the preset target pump displacement value P5 (Q_pump_set) (e.g., 20 m³ / h);

[0110] Convert the target displacement value into a 4-20mA quasi-analog signal (e.g., 18 mA);

[0111] Send analog signals to the AO channel of the high-pressure pump control system: The high-pressure pump operates at a discharge rate of 20 m³ / h;

[0112] Send a DO signal (ON) to the high-pressure pump "start enabled" control circuit terminal;

[0113] END IF

[0114] IF (HMI "Stop Pumping" button is pressed) THEN

[0115] Send a 4mA analog signal (corresponding to 0% displacement) to the AO channel of the high-pressure pump control system;

[0116] Send a DO signal (OFF) to the high-pressure pump "start enabled" control circuit terminal: the high-pressure pump stops;

[0117] END IF

[0118] Logic E: Pump unit interlock safety protection (highest priority)

[0119] IF L <P4 (L_critical) THEN

[0120] [!! Force interlock protection to be implemented!!]

[0121] Send a 4mA analog signal (corresponding to 0% displacement) to the AO channel of the high-pressure pump control system;

[0122] Send a DO signal (OFF) to the high-pressure pump "start enabled" control circuit terminal (forcefully shut off high-pressure pump operation);

[0123] The HMI triggers a Level 1 alarm message: "Liquid level too low, pump unit has been interlocked and stopped";

[0124] ELSE

[0125] Once the interlock protection is released, logic D can execute control actions normally.

[0126] END IF

[0127] Update all output (Output Scan);

[0128] The PLC synchronously sends the final DO / AO signals obtained from all the above logical calculations to all physical hardware connection ports (variable frequency controller, electronic control valve, contactor, high-pressure pump control system).

[0129] [Loop ends, return to step 1]

[0130] This example system is adaptable to injection of particles of different sizes and concentrations, accurately maintaining a constant working fluid concentration and exhibiting good versatility. It is also compatible with various flow modifier systems, effectively improving profile control and displacement in complex reservoirs. While ensuring safe equipment operation, the system achieves automated continuous operation, significantly enhancing reservoir recovery.

[0131] A second aspect of this disclosure also provides a control method for an oil reservoir flow regulating agent injection system: the system includes a central control module, a screw conveyor feeding module, a skid-mounted mixing tank module, and a high-pressure flow regulating pump skid-mounted module, wherein the screw conveyor feeding module includes a shaftless screw conveyor, a discharge hopper, and a frequency converter; the skid-mounted mixing tank module includes a tank body, a mixing module, and a signal acquisition module; the signal acquisition module includes a level sensor and an online viscometer installed on the tank body. Figure 2 As shown, the method includes:

[0132] The central control module acquires the real-time viscosity value of the working fluid from the online viscometer, compares the real-time viscosity value with the target viscosity value to obtain the current viscosity deviation value, and generates a frequency control signal based on the current viscosity deviation value using a PID algorithm, which is then sent to the variable frequency drive. The module also acquires the real-time liquid level value of the working fluid from the level sensor, compares the real-time liquid level value with a safety critical liquid level threshold, and generates a forced shutdown command if the real-time liquid level value is lower than the safety critical liquid level threshold, which is then sent to the high-pressure flow regulating pump skid module.

[0133] Solid particle flow modifier is received through the feeding funnel;

[0134] The variable frequency drive adjusts the operating frequency of the shaftless screw conveyor based on the frequency control signal to transport the solid particle flow regulator to the skid-mounted mixing tank module.

[0135] The received solid particle flow regulator and carrier liquid are stirred and mixed by the stirring and mixing module of the skid-mounted mixing tank module to obtain the working liquid;

[0136] If the forced shutdown command is not received, the working fluid is injected into the target formation through the high-pressure flow regulating pump skid module.

[0137] The specific implementation of the control method in this embodiment can be found in the above explanation of the reservoir flow control agent injection system, and will not be repeated here.

[0138] In another embodiment of this disclosure, obtaining the frequency control signal based on the current viscosity deviation value using a PID algorithm includes: acquiring historical viscosity deviation values; determining the frequency adjustment increment of the variable frequency drive based on the current viscosity deviation value, the historical viscosity deviation value, and the rate of change of viscosity deviation; and obtaining the frequency control signal based on the frequency adjustment increment and the current operating frequency.

[0139] Based on a PID (Proportional-Integral-Derivative) closed-loop control algorithm, the feeding speed of the screw conveyor module is dynamically adjusted according to the deviation between the real-time viscosity data of the working fluid in the skid-mounted mixing tank module and the target viscosity value, so as to achieve precise and stable control of the working fluid viscosity. The specific process is as follows: The central control module first obtains the real-time viscosity value fed back by the online viscometer and calculates the current viscosity deviation value with the preset target viscosity value; at the same time, it retrieves historical viscosity deviation data, and combines the current viscosity deviation value, historical viscosity deviation value and the rate of change of viscosity deviation (i.e., the trend of deviation change over time) to calculate the frequency adjustment increment of the variable frequency drive through the proportional (adjusting according to the current deviation magnitude), integral (adjusting according to the historical deviation accumulation), and derivative (adjusting according to the deviation change rate prediction) links of the PID algorithm, respectively, to comprehensively determine the frequency adjustment increment of the variable frequency drive; then, the frequency adjustment increment is superimposed with the current operating frequency of the shaftless screw conveyor to calculate the target operating frequency, and finally the corresponding frequency control signal is generated and sent to the variable frequency drive, which executes the frequency adjustment operation to realize the dynamic correction of the feeding speed.

[0140] The solution in this embodiment can not only automatically control the start and stop of the spiral lifting feeding module according to the liquid level change to avoid overflow or insufficient working fluid in the tank, but also optimize the feeding rate in real time based on the deviation of working fluid characteristics, realizing fine adjustment of feeding speed, ensuring that the working fluid characteristics are stable and meet the target requirements, effectively improving the automation and accuracy of flow regulating agent preparation, reducing manual intervention while ensuring the effect and stability of subsequent injection operations.

[0141] According to embodiments of this disclosure, this disclosure also provides an electronic device and a readable storage medium.

[0142] Figure 3 A schematic block diagram of an example electronic device that can be used to implement embodiments of the present disclosure is shown. The electronic device is intended to represent various forms of digital computers, such as laptop computers, desktop computers, workstations, personal digital assistants, servers, blade servers, mainframe computers, and other suitable computers. The electronic device may also represent various forms of mobile devices, such as personal digital processors, cellular phones, smartphones, wearable devices, and other similar computing devices. The components shown herein, their connections and relationships, and their functions are merely illustrative and are not intended to limit the implementation of the present disclosure described and / or claimed herein.

[0143] like Figure 3As shown, device 800 includes a computing unit 801, which can perform various appropriate actions and processes based on a computer program stored in read-only memory (ROM) 802 or a computer program loaded from storage unit 808 into random access memory (RAM) 803. RAM 803 may also store various programs and data required for the operation of device 800. The computing unit 801, ROM 802, and RAM 803 are interconnected via bus 804. Input / output (I / O) interface 805 is also connected to bus 804.

[0144] Multiple components in device 800 are connected to I / O interface 805, including: input unit 806, such as keyboard, mouse, etc.; output unit 807, such as various types of monitors, speakers, etc.; storage unit 808, such as disk, optical disk, etc.; and communication unit 809, such as network card, modem, wireless transceiver, etc. Communication unit 809 allows device 800 to exchange information / data with other devices through computer networks such as the Internet and / or various telecommunications networks.

[0145] The computing unit 801 can be various general-purpose and / or special-purpose processing components with processing and computing capabilities. Some examples of the computing unit 801 include, but are not limited to, a central processing unit (CPU), a graphics processing unit (GPU), various special-purpose artificial intelligence (AI) computing chips, various computing units running machine learning model algorithms, a digital signal processor (DSP), and any suitable processor, controller, microcontroller, etc. The computing unit 801 performs the various methods and processes described above, such as a control method for a reservoir flow control agent injection system. For example, in some embodiments, a control method for a reservoir flow control agent injection system can be implemented as a computer software program tangibly contained in a machine-readable medium, such as storage unit 808. In some embodiments, part or all of the computer program can be loaded and / or installed on device 800 via ROM 802 and / or communication unit 809. When the computer program is loaded into RAM 803 and executed by the computing unit 801, one or more steps of the control method for a reservoir flow control agent injection system described above can be performed. Alternatively, in other embodiments, the computing unit 801 may be configured by any other suitable means (e.g., by means of firmware) to perform a control method for a reservoir flow modifier injection system.

[0146] Various embodiments of the systems and techniques described above herein can be implemented in digital electronic circuit systems, integrated circuit systems, field-programmable gate arrays (FPGAs), application-specific integrated circuits (ASICs), application-specific standard products (ASSPs), system-on-a-chip (SoCs), complex programmable logic devices (CPLDs), computer hardware, firmware, software, and / or combinations thereof. These various embodiments may include implementations in one or more computer programs that can be executed and / or interpreted on a programmable system including at least one programmable processor, which may be a dedicated or general-purpose programmable processor, capable of receiving data and instructions from a storage system, at least one input device, and at least one output device, and transferring data and instructions to the storage system, the at least one input device, and the at least one output device.

[0147] The program code used to implement the methods of this disclosure may be written in any combination of one or more programming languages. This program code may be provided to a processor or controller of a general-purpose computer, special-purpose computer, or other programmable data processing apparatus, such that when executed by the processor or controller, the program code causes the functions / operations specified in the flowcharts and / or block diagrams to be implemented. The program code may be executed entirely on a machine, partially on a machine, as a standalone software package partially on a machine and partially on a remote machine, or entirely on a remote machine or server.

[0148] In the context of this disclosure, a machine-readable medium can be a tangible medium that may contain or store a program for use by or in conjunction with an instruction execution system, apparatus, or device. A machine-readable medium can be a machine-readable signal medium or a machine-readable storage medium. A machine-readable medium can be, but is not limited to, electronic, magnetic, optical, electromagnetic, infrared, or semiconductor systems, apparatus, or devices, or any suitable combination of the foregoing. More specific examples of machine-readable storage media include electrical connections based on one or more wires, portable computer disks, hard disks, random access memory (RAM), read-only memory (ROM), erasable programmable read-only memory (EPROM or flash memory), optical fiber, portable compact disk read-only memory (CD-ROM), optical storage devices, magnetic storage devices, or any suitable combination of the foregoing.

[0149] To provide interaction with a user, the systems and techniques described herein can be implemented on a computer having: a display device for displaying information to the user (e.g., a CRT (cathode ray tube) or LCD (liquid crystal display) monitor); and a keyboard and pointing device (e.g., a mouse or trackball) through which the user provides input to the computer. Other types of devices can also be used to provide interaction with the user; for example, feedback provided to the user can be any form of sensory feedback (e.g., visual feedback, auditory feedback, or tactile feedback); and input from the user can be received in any form (including sound input, voice input, or tactile input).

[0150] The systems and technologies described herein can be implemented in computing systems that include backend components (e.g., as a data server), or computing systems that include middleware components (e.g., an application server), or computing systems that include frontend components (e.g., a user computer with a graphical user interface or web browser through which a user can interact with implementations of the systems and technologies described herein), or any combination of such backend, middleware, or frontend components. The components of the system can be interconnected via digital data communication of any form or medium (e.g., a communication network). Examples of communication networks include local area networks (LANs), wide area networks (WANs), and the Internet.

[0151] Computer systems can include clients and servers. Clients and servers are generally located far apart and typically interact via communication networks. Client-server relationships are created by computer programs running on the respective computers and having a client-server relationship with each other. Servers can be cloud servers, servers in distributed systems, or servers incorporating blockchain technology.

[0152] It should be understood that the various forms of processes shown above can be used to rearrange, add, or delete steps. For example, the steps described in this disclosure can be executed in parallel, sequentially, or in different orders, as long as the desired result of the technical solution of this disclosure can be achieved, and this is not limited herein.

[0153] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one of that feature. In the description of this disclosure, "a plurality of" means two or more, unless otherwise explicitly specified.

[0154] The above description is merely a specific embodiment of this disclosure, but the scope of protection of this disclosure is not limited thereto. Any variations or substitutions that can be easily conceived by those skilled in the art within the scope of the technology disclosed in this disclosure should be included within the scope of protection of this disclosure. Therefore, the scope of protection of this disclosure should be determined by the scope of the claims.

Claims

1. An injection system for a reservoir conformance agent, characterized in that, The system comprises a central control module, a screw lifting feeding module, a skid-mounted stirring tank module and a high-pressure flow regulating pump skid-mounted module, wherein the screw lifting feeding module comprises an axis-free screw lifting machine, a discharging hopper and a frequency converter; the skid-mounted stirring tank module comprises a tank body, a stirring and mixing module and a signal acquisition module; the signal acquisition module comprises a liquid level sensor and an online viscosity meter installed on the tank body; The central control module is configured to: acquire a real-time viscosity value of working fluid fed back by the online viscosity meter in real time, compare the real-time viscosity value with a target viscosity value to obtain a current viscosity deviation value; obtain a frequency control signal by a PID algorithm based on the current viscosity deviation value and send the frequency control signal to the frequency converter; acquire a real-time liquid level value of working fluid fed back by the liquid level sensor in real time, compare the real-time liquid level value with a safety critical liquid level threshold value, and if the real-time liquid level value is lower than the safety critical liquid level threshold value, generate a forced shutdown instruction and send the forced shutdown instruction to the high-pressure flow regulating pump skid-mounted module; The discharging hopper is configured to receive solid particle flow regulators, and the frequency converter is configured to adjust the operating frequency of the axis-free screw lifting machine based on the frequency control signal to deliver the solid particle flow regulators to the skid-mounted stirring tank module; The skid-mounted stirring tank module is configured to stir and mix the received solid particle flow regulators and carrying liquid by the stirring and mixing module to obtain working fluid. The high-pressure flow regulating pump skid-mounted module is configured to inject the working fluid into a target formation in response to not receiving the forced shutdown instruction. The central controller is further configured to acquire a historical viscosity deviation value, determine a frequency adjustment increment of the frequency converter based on the current viscosity deviation value, the historical viscosity deviation value and a change rate of viscosity deviation, and obtain a frequency control signal based on the frequency adjustment increment and a current operating frequency.

2. The system of claim 1, wherein, The high-pressure flow regulating pump skid-mounted module comprises at least two high-pressure injection pumps arranged in parallel; The central control module is further configured to determine a rated displacement of the high-pressure injection pumps, and determine a high-pressure injection pump in an operating state among the at least two high-pressure injection pumps based on the rated displacement and a target displacement.

3. The system of claim 1, wherein, The online viscosity meter is a tuning fork vibration type viscosity meter or a rotary type viscosity meter, which is installed on a slurry outlet pipeline of the skid-mounted stirring tank module and located before a liquid inlet of the high-pressure flow regulating pump skid-mounted module, and is configured to detect a real-time viscosity value of working fluid stirred by the stirring and mixing module.

4. The system of claim 1, wherein, The skid-mounted stirring tank module further comprises an electrically controlled adjusting valve. The central control module is further configured to compare the real-time liquid level value with a low liquid level threshold value and a safety critical liquid level threshold value, and if the real-time liquid level value is lower than the low liquid level threshold value and higher than the safety critical liquid level threshold value, generate an opening instruction of the electrically controlled adjusting valve and a starting instruction of the screw lifting feeding module; The electrically controlled adjusting valve inputs carrying liquid into the tank body of the skid-mounted stirring tank module in response to the opening instruction; The frequency converter controls the axis-free screw lifting machine to start operating at an initial rotating speed in response to the starting instruction.

5. The system of claim 1, wherein, The system further comprises an operation interaction module for receiving a user inputted control parameter; the control parameter comprises a target viscosity value of working fluid, a safety critical liquid level threshold value and a PID control parameter.

6. A control method of an oil reservoir flow regulator injection system, characterized by, The system comprises a central control module, a spiral lifting feeding module, a skid-mounted stirring tank module and a high-pressure flow regulating pump skid-mounted module, wherein the spiral lifting feeding module comprises an axis-free spiral elevator, a discharging hopper and a frequency converter; the skid-mounted stirring tank module comprises a tank body, a stirring and mixing module and a signal acquisition module; the signal acquisition module comprises a liquid level sensor and an online viscosity meter installed on the tank body; the method comprises: Through the central control module, a real-time viscosity value of working fluid fed back by the online viscosity meter is acquired in real time, the real-time viscosity value is compared with a target viscosity value to obtain a current viscosity deviation value; based on the current viscosity deviation value, a frequency control signal is obtained through a PID algorithm and sent to the frequency converter; a real-time liquid level value of working fluid fed back by the liquid level sensor is acquired in real time, the real-time liquid level value is compared with a safety critical liquid level threshold value, if the real-time liquid level value is lower than the safety critical liquid level threshold value, a forced shutdown instruction is generated and sent to the high-pressure flow regulating pump skid-mounted module; The solid particle flow regulator is received through the discharging hopper; Based on the frequency control signal, the running frequency of the axis-free spiral elevator is adjusted through the frequency converter, and the solid particle flow regulator is conveyed to the skid-mounted stirring tank module; The solid particle flow regulator and the carrying liquid received are stirred and mixed through the stirring and mixing module of the skid-mounted stirring tank module to obtain working fluid; If the forced shutdown instruction is not received, the working fluid is injected into a target formation through the high-pressure flow regulating pump skid-mounted module. The method further comprises: acquiring a historical viscosity deviation value; based on the current viscosity deviation value, the historical viscosity deviation value and a change rate of viscosity deviation, a frequency adjustment increment of the frequency converter is determined; based on the frequency adjustment increment and a current running frequency, a frequency control signal is obtained.

7. A non-transitory computer-readable storage medium having stored thereon computer instructions, wherein, The computer instructions are used to make the computer execute the method of claim 6.

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