Online water quality multi-parameter intensive detection device for oil and gas field produced water

Abstract

The invention discloses an oil and gas field produced water on-line water quality multi-parameter intensive detection device, and relates to the field of water quality on-line monitoring. The device comprises an angle steel base, the top of the angle steel base is fixedly connected with a positive-pressure anti-explosion control cabinet used for installing produced water online water quality detection electrical equipment, and the side face of the positive-pressure anti-explosion control cabinet is fixedly connected with an air conditioner anti-explosion cabinet used for heat dissipation treatment of the produced water online water quality detection electrical equipment. The top of the positive pressure explosion-proof control cabinet is fixedly connected with a lifting ring used for lifting the positive pressure explosion-proof control cabinet. Through mutual cooperation of the PLC control unit, the automatic sampling and preprocessing unit, the multi-parameter detection and analysis unit and other components in the positive pressure explosion-proof control cabinet, adaptation to special working conditions is achieved, and the problem that an existing instrument is not suitable for water and soil in oil and gas field produced water monitoring is solved; stable operation and accurate detection under a complex water quality condition are achieved, and the maintenance cost is reduced.

Description

Technical Field

[0001] This invention relates to the technical field of online water quality monitoring, specifically to an online multi-parameter integrated detection device for produced water from oil and gas fields. Background Technology

[0002] Produced water reinjection is a major production method in oil and gas extraction. Its functions include: 1) maintaining formation stress and raising the fluid level to facilitate oil and gas extraction; 2) using high-pressure water injection to "force out" oil and gas trapped in rock pores, increasing recovery rates; and 3) conserving water resources and reducing excessive groundwater extraction by reinjecting "wastewater" back into the formation (although the treated water still falls under the category of industrial wastewater prohibited from surface discharge, its quality is compatible with the formation environment and can aid in the extraction of crude oil and natural gas). Therefore, ensuring the quality of the reinjected water meets standards is crucial and requires real-time monitoring. Traditional testing methods involve manual sampling and laboratory analysis, often conducted in three shifts (morning, noon, and evening), which is labor-intensive, time-consuming (averaging 1.5 hours), and involves toxic reagents and waste liquids requiring centralized treatment.

[0003] This outdated detection method is no longer keeping pace with the times and the needs of energy production. Therefore, the use of optical and electrochemical principles for online water quality monitoring of oil and gas field produced water (fast, convenient, and reagent-free) is gradually becoming a trend. "Not all water is created equal." Oil and gas field produced water differs from general industrial wastewater; its significant characteristics include "high oil content, numerous impurities, and corrosiveness." Furthermore, various chemical agents (demulsifiers, coagulants, flocculants, corrosion and scale inhibitors, and bactericides) are added during treatment, making the already complex water quality even more complex and variable. This renders conventional online water quality monitoring instruments ineffective, or even unusable. This is because—the vast majority of instruments and equipment used for online water quality monitoring, both domestically and internationally, are designed and developed based on the environmental monitoring needs of surface water, drinking water, recycled water, or treated industrial and domestic wastewater discharged into rivers, lakes, and seas to ensure compliance with standards. Summary of the Invention

[0004] To address the shortcomings of existing technologies, this invention provides an online multi-parameter integrated detection device for produced water quality in oil and gas fields, which solves the problems mentioned in the background section.

[0005] To achieve the above objectives, the present invention provides the following technical solution: an online multi-parameter integrated detection device for produced water quality in oil and gas fields, comprising an angle steel base, a positive pressure explosion-proof control cabinet fixedly connected to the top of the angle steel base for installing online produced water quality detection electrical equipment, an air conditioning explosion-proof cabinet fixedly connected to the side of the positive pressure explosion-proof control cabinet for heat dissipation of the online produced water quality detection electrical equipment, a lifting ring fixedly connected to the top of the positive pressure explosion-proof control cabinet for hoisting the positive pressure explosion-proof control cabinet, a display screen on the side of the positive pressure explosion-proof control cabinet for online water quality detection operation, and a... The pressure relief valve is used for online water pressure regulation. A working indicator light is installed on the side of the positive pressure explosion-proof control cabinet to monitor water leakage in real time. An emergency stop reset switch is installed on the side of the positive pressure explosion-proof control cabinet to close related valves in series. An explosion-proof alarm light is installed on the side of the positive pressure explosion-proof control cabinet. A sampling water inlet flange is fixedly installed on the side of the positive pressure explosion-proof control cabinet for connecting an external sampling water pipe. A cleaning water inlet flange is fixedly installed on the side of the positive pressure explosion-proof control cabinet for connecting a cleaning water pipe. An external drain outlet flange is fixedly installed on the other side of the positive pressure explosion-proof control cabinet for discharging wastewater after cleaning.

[0006] According to the above technical solution, the positive pressure explosion-proof control cabinet is equipped with a PLC control unit. The PLC control unit has multiple output terminals equipped with an automatic sampling and preprocessing unit, a multi-parameter detection and analysis unit, an automatic backwashing unit, and an integrated safety protection unit. The PLC control unit is responsible for data acquisition (1-5 seconds / time), processing (calibration, outlier removal), storage (supporting 3 months of local backup), uploading, as well as automatic system process control and remote interaction, and supports standard protocols such as Modbus. The automatic sampling and preprocessing unit automatically samples from designated nodes, and processes the samples through pressure regulation, filtration, flow control, homogenization (to ensure uniform oil droplet distribution), and demulsification (separating emulsified oil) to ensure that the water sample meets the detection requirements, achieving low oil detection accuracy in the water. Concentration: At 10ppm, the accuracy can reach 0.1ppm; at high concentrations within the 100ppm range, the accuracy error is within 5%. The multi-parameter detection and analysis unit enables simultaneous detection of multiple indicators. The oil-water analyzer uses compressed air to drive a piston to self-clean the measuring tank, and is equipped with a fine filter backwashing function to avoid contamination. Sensors for suspended solids are installed in a closed measuring water tank with backwashing, featuring a dual water path design (independent water paths for oil detection and multi-parameter detection) to prevent interference. The automatic backwashing unit uses compressed air to drive clean water to powerfully backwash the sensors, measuring water tank, filter, and pipelines according to the set pressure and frequency, reducing manual maintenance. The integrated safety protection unit ensures explosion-proof performance, monitors faults in real time, and triggers protection measures (power off, valve shut-off).

[0007] According to the above technical solution, the PLC control unit includes a touch screen, a CPU module, a communication module, and an environmental data acquisition instrument; the automatic sampling and pretreatment unit includes a sampling pipeline, a pressure regulating valve, a filter, and a high-speed centrifugal sampling pump; the multi-parameter detection and analysis unit includes a compressed air pipeline, a solenoid valve, and a rotary nozzle; and the integrated safety protection unit includes a constant temperature controller. The cooperation of these multiple components enables accurate, efficient, and safe detection of the produced water quality in oil and gas fields.

[0008] According to the above technical solution, the positive pressure explosion-proof control cabinet is equipped with a circulating heat dissipation structure. The circulating heat dissipation structure includes a circulating pipe that runs through and is fixedly connected to the circumferential surface of the cleaning water inlet flange. A booster water pump is installed on the circumferential surface of the circulating pipe. A cold treatment pipe is fixedly connected to the end of the circulating pipe away from the cleaning water inlet flange. A temperature-conducting plate is installed on the circumferential surface of the cold treatment pipe. A connecting rod is fixedly connected to the top of the temperature-conducting plate. A heat-conducting pipe is fixedly connected to the end of the cold treatment pipe away from the circulating pipe. A one-way valve is fixedly connected to the end of the heat-conducting pipe away from the cold treatment pipe. This allows the entire circulating heat dissipation structure to effectively reduce the temperature inside the positive pressure explosion-proof control cabinet, ensuring the normal operation of important units and stabilizing the directional heat dissipation of components with high temperatures.

[0009] According to the above technical solution, the interior of the one-way valve is fixedly connected to the circumference of the cleaning water inlet flange, and a regulating valve is provided on the circumferential surface of the circulation pipe. The operator can view the temperature detection data of the built-in temperature sensor in the positive pressure explosion-proof control cabinet 2 through the display screen 5. Combined with the actual heat dissipation requirements, the water flow rate in the circulation pipe 131 can be flexibly controlled by the regulating valve 14, thereby accurately adjusting the heat dissipation efficiency and avoiding energy waste and adverse effects of excessive heat dissipation on the equipment.

[0010] According to the above technical solution, the side cross-section of the cold treatment tube is set to S-shape, and the number of temperature-conducting plates is set to several and arranged linearly along the circumference of the cold treatment tube. The cold treatment tube is located inside the air-conditioning explosion-proof cabinet, and the two ends of the connecting rod are fixedly connected to the inner wall of the air-conditioning explosion-proof cabinet. The S-shaped side cross-section design increases the contact area between the cold treatment tube and the surrounding environment. Combined with the multiple linearly arranged temperature-conducting plates, the heat exchange efficiency is greatly improved, and the stability of heat exchange is increased.

[0011] According to the above technical solution, the one-way valve is unidirectionally open to the inside of the cleaning water inlet flange, and the circumferential surface of the heat-conducting pipe abuts against the side of the PLC control unit. The unidirectional opening ensures that the water flow can only flow in the predetermined direction, preventing backflow from damaging the equipment. Its heat-conducting pipe can effectively transfer heat to the heat dissipation structure near the PLC control unit, further ensuring that the PLC control unit operates stably in a suitable temperature environment.

[0012] According to the above technical solution, a wind circulation device is provided on the circumferential surface of the heat pipe. The wind circulation device includes a guide pipe, one end of which is fixedly inserted through the circumferential surface of the heat pipe, and a vortex tube is fixedly inserted through the other end of the guide pipe. A rotating shaft is rotatably connected through the circumferential surface of the vortex tube. A vortex fan is fixedly connected to one end of the rotating shaft, and a fan blade is fixedly connected to the end of the rotating shaft away from the vortex fan. A solenoid valve A is provided on the circumferential surface of the heat pipe, and a solenoid valve B is provided on the circumferential surface of the guide pipe. When solenoid valve B is opened, the liquid in the heat pipe can enter the vortex tube through the guide pipe. At this time, the vortex fan drives the rotating shaft to rotate under the impact of the water flow, thereby driving the fan blade to rotate synchronously, forming a directional airflow circulation.

[0013] According to the above technical solution, the other end of the guide pipe is fixedly connected to the circumferential surface of the heat pipe, and the solenoid valve B is located at the interface between the heat pipe and the guide pipe, so as to ensure that the solenoid valve A and the solenoid valve B can accurately control the flow between the guide pipe and the heat pipe and switch the opening and closing of the wind power circulation device.

[0014] According to the above technical solution, the circumferential surface of the rotating shaft and the circumferential surface of the guide tube are intersected. The vortex fan is located inside the guide tube. The rotation of the vortex fan will synchronously drive the fan blades to rotate. The directional airflow generated by the rotation of the fan blades can better dissipate heat from the controller on its side, and at the same time help the cold air circulation in the positive pressure explosion-proof control cabinet.

[0015] This invention provides an online multi-parameter integrated detection device for produced water quality in oil and gas fields. It has the following beneficial effects: (1) This invention achieves adaptation to special working conditions through the cooperation of components such as the PLC control unit, automatic sampling and preprocessing unit, and multi-parameter detection and analysis unit in the positive pressure explosion-proof control cabinet. It solves the problem of existing instruments being "unsuitable" for oil and gas field produced water monitoring, achieves stable operation and accurate detection under complex water quality conditions, reduces maintenance costs, and reduces the pollution and blockage of sensors and pipelines through preprocessing and backwashing functions, achieving "maintenance-free" operation, reducing labor costs, improving management efficiency, replacing manual sampling and testing, reducing labor intensity and testing costs, providing real-time data support for water treatment process optimization, improving the level of digital management, and ensuring safety and environmental protection. The positive pressure explosion-proof and multiple safety protection designs avoid safety risks, and the automatic data upload avoids human fraud, which helps enterprises fulfill their environmental responsibilities.

[0016] (2) By setting up a circulating heat dissipation structure, the internal temperature of the positive pressure explosion-proof control cabinet can be effectively controlled. Even under long-term continuous operation or high-temperature environment, the key unit parts can be kept within a stable operating temperature range, avoiding performance degradation or failure due to overheating, and significantly improving the overall reliability and service life of the device. In the circulating heat dissipation structure, the circulating pipe and the booster pump form a stable water flow circulation. The cold treatment pipe, through its unique S-shaped design and the combination with the heat-conducting plate, realizes an efficient heat exchange process, quickly transferring heat to the heat-conducting pipe. The heat-conducting pipe and the PLC control unit are closely attached to each other, further enhancing the heat dissipation effect.

[0017] (3) By setting up a wind circulation device, the present invention enables the water flow to impact the vortex fan and drive the rotating shaft to rotate when the liquid flows in the heat pipe, thereby driving the fan blades to rotate and forming a directional airflow. This not only enhances the air flow around the heat pipe and effectively improves the heat dissipation effect, but also promotes the circulation of cold air inside the positive pressure explosion-proof control cabinet, making the temperature distribution inside the cabinet more uniform and avoiding the occurrence of local overheating. Attached Figure Description

[0018] Figure 1 This is a schematic diagram of the overall structure of the present invention; Figure 2 This is a schematic diagram of the overall side view of the present invention; Figure 3 This is a schematic diagram of the internal structure of the positive pressure explosion-proof control cabinet of the present invention; Figure 4 This is a schematic cross-sectional view of the entire structure of the present invention; Figure 5 This is a partial structural schematic diagram of the present invention; Figure 6 For the present invention Figure 5 Enlarged structural diagram at point A; Figure 7 For the present invention Figure 5 Enlarged structural diagram at point B.

[0019] In the diagram: 1. Angle steel base; 2. Positive pressure explosion-proof control cabinet; 21. PLC control unit; 22. Automatic sampling and pretreatment unit; 23. Multi-parameter detection and analysis unit; 24. Automatic backwashing unit; 25. Integrated safety protection unit; 3. Air conditioning explosion-proof cabinet; 4. Lifting ring; 5. Display screen; 6. Pressure relief valve; 7. Working indicator light; 8. Emergency stop reset switch; 9. Explosion-proof alarm light; 10. Sampling water inlet flange; 11. Cleaning water inlet flange ; 12. External drain outlet flange; 13. Circulating heat dissipation structure; 131. Circulation pipe; 132. Booster water pump; 133. Cold treatment pipe; 134. Temperature conductive plate; 135. Connecting rod; 136. Heat conduction pipe; 137. One-way valve; 14. Regulating valve; 15. Wind power circulation device; 151. Guide pipe; 152. Swirl pipe; 153. Rotating shaft; 154. Vortex fan; 155. Fan blade; 156. Solenoid valve A; 157. Solenoid valve B. Detailed Implementation

[0020] The technical solutions of the present invention will be clearly and completely described below with reference to the accompanying drawings of the embodiments of the present invention. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments.

[0021] Please see Figure 1-7 One embodiment of the present invention is: an online multi-parameter integrated detection device for produced water quality in oil and gas fields, comprising an angle steel base 1, a positive pressure explosion-proof control cabinet 2 fixedly connected to the top of the angle steel base 1 for installing electrical equipment for online produced water quality detection, an air conditioning explosion-proof cabinet 3 fixedly connected to the side of the positive pressure explosion-proof control cabinet 2 for heat dissipation of the electrical equipment for online produced water quality detection, a lifting ring 4 fixedly connected to the top of the positive pressure explosion-proof control cabinet 2 for hoisting the positive pressure explosion-proof control cabinet 2, a display screen 5 provided on the side of the positive pressure explosion-proof control cabinet 2 for online water quality detection operation, and a pressure relief valve 6 provided on the side of the positive pressure explosion-proof control cabinet 2 for online... The positive pressure explosion-proof control cabinet 2 has a working indicator light 7 on its side for real-time monitoring of water leakage. It also has an emergency stop reset switch 8 on its side for connecting and closing related valves. An explosion-proof alarm light 9 is also located on its side. A sampling water inlet flange 10 is fixedly installed on the side of the cabinet for connecting an external sampling water pipe. A cleaning water inlet flange 11 is fixedly installed on the side of the cabinet for connecting a cleaning water pipe. An external drain outlet flange 12 is fixedly installed on the other side of the cabinet for discharging wastewater after cleaning.

[0022] The positive pressure explosion-proof control cabinet 2 is internally equipped with a PLC control unit 21. The PLC control unit 21 has multiple output terminals equipped with an automatic sampling and preprocessing unit 22, a multi-parameter detection and analysis unit 23, an automatic backwashing unit 24, and an integrated safety protection unit 25. The PLC control unit 21 is responsible for data acquisition (1-5 seconds / time), processing and calibration, outlier removal, storage, uploading, automatic system process control, and remote interaction, and supports standard protocols such as Modbus. The automatic sampling and preprocessing unit 22 automatically samples from designated nodes, and processes the samples through pressure regulation, filtration, flow control, homogenization (to ensure uniform oil droplet distribution), and demulsification (to separate emulsified oil) to ensure that the water sample meets the detection requirements, achieving high accuracy in oil detection in the water. Low concentration: accuracy up to 0.1ppm at 10ppm; high concentration: accuracy within 5% at 100ppm. Multi-parameter detection and analysis unit 23 enables simultaneous detection of multiple indicators. The oil-water analyzer uses compressed air to drive a piston to self-clean the measuring tank, and is equipped with a fine filter backwashing function to avoid contamination. Sensors for suspended solids are installed in a closed measuring water tank with backwashing, featuring a dual water path design (independent water paths for oil detection and multi-parameter detection) to prevent interference. Automatic backwashing unit 24 uses compressed air to drive clean water to powerfully backwash the sensors, measuring water tank, filter, and pipelines according to the set pressure and frequency, reducing manual maintenance. Integrated safety protection unit 25 ensures explosion-proof performance, monitors faults in real time, and triggers protection measures (power off, valve shut-off).

[0023] The PLC control unit 21 includes a touch screen, CPU module, communication module, and environmental data acquisition instrument; the automatic sampling and pretreatment unit 22 includes sampling pipeline, pressure regulating valve, filter, and high-speed centrifugal sampling pump; the multi-parameter detection and analysis unit 23 includes compressed air pipeline, solenoid valve, and rotary nozzle; and the integrated safety protection unit 25 includes a constant temperature controller. The cooperation of these multiple components enables accurate, efficient, and safe detection of the produced water quality in oil and gas fields.

[0024] During operation, upon system startup, the angle steel base 1 provides stable support to withstand harsh outdoor environments and prevent equipment displacement. After power-on, the positive pressure explosion-proof control cabinet 2 immediately initiates the pressure maintenance program, injecting compressed air into the cabinet via an external compressed air source to stabilize the pressure at a preset value (e.g., 50Pa). The right side of the positive pressure cabinet is equipped with a positive pressure controller containing a differential pressure transmitter to detect the pressure inside the cabinet. Before powering on the electrical components inside the cabinet, it is purged with air (from an external compressed air source) for half an hour. Once the pressure inside the cabinet exceeds 50Pa, power is supplied to the instruments and electrical components. If the pressure drops below 50Pa, it indicates a loss of positive pressure, triggering an alarm and power cutoff to ensure system safety. The internal water leakage monitoring alarm detects leaks in the water pipes inside the cabinet. The monitoring cable detects a leak, sends an alarm signal, and shuts off the pipeline inlet valve to prevent further leakage and electrical short circuits. The PLC control unit 21 performs a self-check on the sampling pump, sensors, valves, and other equipment. After confirming that the status is normal, the system enters standby mode. Next, the system starts automatic sampling according to the preset sampling interval or remote command. The water sample enters the system through the sampling water inlet flange 10, and after being diverted by the pressure regulating valve, one path enters the automatic sampling and pretreatment unit 22. This unit includes a pre-filter and a high-speed centrifugal sampling pump. First, it filters out large particulate impurities (such as silt and colloids) ≥200μm, and then the centrifugal pump homogenizes and demulsifies the sample to make the oil droplet size less than 20μm, ensuring that the water sample is sampled at a flow rate ≤2L / min and 2-8.A stable flow is maintained at 9 bar pressure; another water sample enters a closed measuring tank directly for subsequent testing. Background interference is effectively reduced during pretreatment to ensure data accuracy. All units work collaboratively. The pretreated water sample enters the multi-parameter detection and analysis unit 23, where the oil analyzer uses infrared transmission to avoid errors from ultraviolet fluorescence, detecting oil concentration in real time (accuracy up to ±5%). Sensors for suspended solids, turbidity, pH, and dissolved oxygen are installed in the closed measuring tank, synchronously outputting data. Detection results are displayed in real time on display screen 5 and transmitted to the PLC unit via a multi-channel transmitter. The working indicator light 7 uses color changes (green for normal, red for fault) to assist monitoring, facilitating quick system status identification by operators. Data acquisition is performed by the PLC unit at a frequency of 1-5 times per second. Through calibration algorithms and outlier removal, environmental influences such as temperature are eliminated. Processed data is stored locally and uploaded to a remote monitoring center via wired (Ethernet / RS485) or wireless (e.g., 4G / 5G) connections. At the end of each detection cycle (typically 1-3 hours), the system activates the automatic backwash unit 24. The PLC unit first closes the sampling valve and opens the drain valve to empty the residual water sample. Then, clean water is introduced through the cleaning water inlet flange 11, and compressed air drives the rotating nozzle to perform a 360° thorough, powerful flush of the measuring water tank, sensor, and filter, removing oil and scale. The flushing contaminants are discharged through the external drain outlet flange 12. The backwash duration is set to ensure sensor cleanliness. The system automatically enters the next detection cycle, achieving cyclical operation. The entire workflow is logically clear.

[0025] Please see Figure 1-7 Based on the above embodiments, in another embodiment of the present invention, the positive pressure explosion-proof control cabinet 2 is provided with a circulating heat dissipation structure 13. The circulating heat dissipation structure 13 includes a circulating pipe 131, which is connected through and fixedly connected to the circumferential surface of the cleaning water inlet flange 11. A booster water pump 132 is provided on the circumferential surface of the circulating pipe 131. A cold treatment pipe 133 is fixedly connected to the end of the circulating pipe 131 away from the cleaning water inlet flange 11. A temperature conducting plate 134 is provided on the circumferential surface of the cold treatment pipe 133. A connecting rod 135 is fixedly connected to the top of the temperature conducting plate 134. A heat conducting pipe 136 is fixedly connected to the end of the cold treatment pipe 133 away from the circulating pipe 131. A one-way valve 137 is fixedly connected to the end of the heat conducting pipe 136 away from the cold treatment pipe 133. This realizes that the entire circulating heat dissipation structure 13 can effectively reduce the temperature inside the positive pressure explosion-proof control cabinet 2, ensure the normal operation of important units, and stabilize the directional heat dissipation of high-temperature components.

[0026] The interior of the one-way valve 137 is fixedly connected to the circumference of the cleaning water inlet flange 11. A regulating valve 14 is provided on the circumference of the circulation pipe 131. The operator can view the temperature detection data of the built-in temperature sensor in the positive pressure explosion-proof control cabinet 2 through the display screen 5. Combined with the actual heat dissipation needs, the water flow rate in the circulation pipe 131 can be flexibly controlled by the regulating valve 14, thereby accurately adjusting the heat dissipation efficiency and avoiding energy waste and adverse effects of excessive heat dissipation on the equipment.

[0027] The side cross-section of the cold treatment tube 133 is set to S-shape, and the number of temperature-conducting plates 134 is set to a number and is arranged linearly along the circumference of the cold treatment tube 133. The cold treatment tube 133 is located inside the air-conditioning explosion-proof cabinet 3. The two ends of the connecting rod 135 are fixedly connected to the inner wall of the air-conditioning explosion-proof cabinet 3. The S-shaped side cross-section design increases the contact area between the cold treatment tube 133 and the surrounding environment. Combined with the multiple linearly arranged temperature-conducting plates 134, the heat exchange efficiency is greatly improved, and the stability of heat exchange is increased.

[0028] The one-way valve 137 is unidirectionally open to the inside of the cleaning water inlet flange 11. The circumferential surface of the heat conduction pipe 136 is in contact with the side of the PLC control unit 21. The unidirectional flow ensures that the water can only flow in the predetermined direction, preventing backflow from damaging the equipment. Its heat conduction pipe 136 can effectively transfer heat to the heat dissipation structure near the PLC control unit 21, further ensuring that the PLC control unit 21 operates stably in a suitable temperature environment.

[0029] A wind-powered circulation device 15 is provided on the circumferential surface of the heat pipe 136. The wind-powered circulation device 15 includes a guide pipe 151, one end of which is fixedly inserted through the circumferential surface of the heat pipe 136, and a vortex pipe 152 is fixedly inserted through the other end of the guide pipe 151. A rotating shaft 153 is rotatably connected through and through the circumferential surface of the vortex pipe 152. A vortex fan 154 is fixedly connected to one end of the rotating shaft 153, and a fan blade 155 is fixedly connected to the other end of the rotating shaft 153 away from the vortex fan 154. A solenoid valve A156 is provided on the circumferential surface of the heat pipe 136, and a solenoid valve B157 is provided on the circumferential surface of the guide pipe 151. When the solenoid valve B157 is opened, the liquid in the heat pipe 136 can enter the vortex pipe 152 through the guide pipe 151. At this time, the vortex fan 154 drives the rotating shaft 153 to rotate under the impact of the water flow, thereby driving the fan blade 155 to rotate synchronously, forming a directional airflow circulation.

[0030] The other end of the guide pipe 151 is fixedly connected to the circumferential surface of the heat pipe 136. The solenoid valve B157 is located at the interface between the heat pipe 136 and the guide pipe 151, ensuring that the solenoid valve A156 and the solenoid valve B157 can accurately control the flow between the guide pipe 151 and the heat pipe 136, and switch the opening and closing of the wind power circulation device 15.

[0031] The circumferential surface of the rotating shaft 153 and the circumferential surface of the guide tube 151 intersect each other. The vortex fan 154 is located inside the guide tube 151. The rotation of the vortex fan 154 will synchronously drive the fan blade 155 to rotate. The directional airflow generated by the rotation of the fan blade 155 can better dissipate heat from the controller on its side, and at the same time help the cold air circulation in the positive pressure explosion-proof control cabinet 2.

[0032] In use, when clean water is connected to the cleaning water inlet flange 11, the regulating valve 14 is opened simultaneously, and the booster water pump 132 is started. Clean water enters the circulation pipe 131. The regulating valve 14 can flexibly control the water flow rate in the circulation pipe 131 according to the actual heat dissipation requirements. The water flows through the circulation pipe 131 into the cold treatment pipe 133. The cold treatment pipe 133 has an S-shaped side cross-section and multiple temperature-conducting fins 134 linearly arrayed on its surface, which greatly improves the heat exchange efficiency and increases the stability of heat exchange. The water temperature inside the cold treatment pipe 133 is lowered by the cold air temperature of the air conditioner. Then, the cold water flows through the heat conduction pipe 136. The heat conduction pipe 136 is in contact with the side of the PLC control unit 21, which can effectively transfer heat to the heat conduction pipe 136 and its nearby heat dissipation structure, ensuring the stable operation of the PLC control unit 21. Then the water returns to the cleaning water inlet flange 11 to form a circulation. When more efficient heat dissipation is required, the solenoid valve B can be opened. 157. Then close the solenoid valve A156. At this time, the liquid in the heat pipe 136 enters the vortex pipe 152 through the guide pipe 151. Under the impact of the water flow, the vortex fan 154 drives the rotating shaft 153 to rotate, which in turn drives the fan blade 155 to rotate synchronously, forming a directional airflow circulation. The directional airflow generated by the rotation of the fan blade 155 can not only better dissipate heat from the controller on its side, but also help circulate the cold air in the positive pressure explosion-proof control cabinet 2. If such a strong heat dissipation effect is not required, close the solenoid valve B157 and open the solenoid valve A156 to stop the operation of the wind power circulation device 15. The solenoid valve A156 can also be operated according to specific needs to precisely control the flow between the guide pipe 151 and the heat pipe 136. The entire heat dissipation process is flexible and controllable, which can effectively meet the heat dissipation requirements of the positive pressure explosion-proof control cabinet 2 under different working conditions and ensure the stable operation of the online multi-parameter integrated detection device for produced water in oil and gas fields.

[0033] The above description is only a preferred embodiment of the present invention, but the scope of protection of the present invention is not limited thereto. Any equivalent substitutions or modifications made by those skilled in the art within the scope of the technology disclosed in the present invention, based on the technical solution and inventive concept of the present invention, should be covered within the scope of protection of the present invention.

Claims

1. An online multi-parameter integrated detection device for produced water quality in oil and gas fields, comprising an angle steel base (1), characterized in that: The top of the angle steel base (1) is fixedly connected to a positive pressure explosion-proof control cabinet (2) for installing electrical equipment for online water quality testing of produced water. An air-conditioning explosion-proof cabinet (3) is fixedly connected to the side of the positive pressure explosion-proof control cabinet (2) for heat dissipation of the electrical equipment for online water quality testing of produced water. A lifting ring (4) is fixedly connected to the top of the positive pressure explosion-proof control cabinet (2) for hoisting the positive pressure explosion-proof control cabinet (2). A display screen (5) is installed on the side of the positive pressure explosion-proof control cabinet (2) for online water quality testing operations. A pressure relief valve (6) is installed on the side of the positive pressure explosion-proof control cabinet (2) for online water pressure regulation. A tool is installed on the side of the positive pressure explosion-proof control cabinet (2). An indicator light (7) is used to monitor the water leakage in the positive pressure explosion-proof control cabinet (2) in real time. An emergency stop reset switch (8) is provided on the side of the positive pressure explosion-proof control cabinet (2) to close related valves in series. An explosion-proof alarm light (9) is provided on the side of the positive pressure explosion-proof control cabinet (2). A sampling water inlet flange (10) is fixedly passed through the side of the positive pressure explosion-proof control cabinet (2) to connect an external sampling water pipe. A cleaning water inlet flange (11) is fixedly passed through the side of the positive pressure explosion-proof control cabinet (2) to connect a cleaning water pipe. An external drain outlet flange (12) is fixedly passed through the other side of the positive pressure explosion-proof control cabinet (2) to discharge the wastewater after cleaning.

2. The online multi-parameter integrated detection device for produced water quality in oil and gas fields according to claim 1, characterized in that: The positive pressure explosion-proof control cabinet (2) is equipped with a PLC control unit (21). The multiple output terminals of the PLC control unit (21) are respectively equipped with an automatic sampling and preprocessing unit (22), a multi-parameter detection and analysis unit (23), an automatic backwashing unit (24), and an integrated safety protection unit (25).

3. The online multi-parameter integrated detection device for produced water quality in oil and gas fields according to claim 2, characterized in that: The PLC control unit (21) includes a touch screen, a CPU module, a communication module and an environmental data acquisition instrument. The automatic sampling and preprocessing unit (22) includes a sampling pipeline, a pressure regulating valve, a filter and a high-speed centrifugal sampling pump. The multi-parameter detection and analysis unit (23) includes a compressed air pipeline, a solenoid valve and a rotary nozzle. The integrated safety protection unit (25) includes a constant temperature controller.

4. The online multi-parameter integrated detection device for produced water quality in oil and gas fields according to claim 3, characterized in that: The positive pressure explosion-proof control cabinet (2) is equipped with a circulating heat dissipation structure (13). The circulating heat dissipation structure (13) includes a circulating pipe (131). The circulating pipe (131) passes through and is fixedly connected to the circumferential surface of the cleaning water inlet flange (11). A booster water pump (132) is provided on the circumferential surface of the circulating pipe (131). A cold treatment pipe (133) is fixedly connected to the end of the circulating pipe (131) away from the cleaning water inlet flange (11). A temperature-conducting plate (134) is provided on the circumferential surface of the cold treatment pipe (133). A connecting rod (135) is fixedly connected to the top of the temperature-conducting plate (134). A heat-conducting pipe (136) is fixedly connected to the end of the cold treatment pipe (133) away from the circulating pipe (131). A one-way valve (137) is fixedly connected to the end of the heat-conducting pipe (136) away from the cold treatment pipe (133).

5. The online multi-parameter integrated detection device for produced water quality in oil and gas fields according to claim 4, characterized in that: The interior of the one-way valve (137) is fixedly connected to the circumference of the cleaning water inlet flange (11), and a regulating valve (14) is provided on the circumferential surface of the circulation pipe (131).

6. The online multi-parameter integrated detection device for produced water quality in oil and gas fields according to claim 5, characterized in that: The side cross section of the cold treatment tube (133) is set to S-shape. The number of the temperature conducting plates (134) is set to several and is arranged linearly along the circumference of the cold treatment tube (133). The cold treatment tube (133) is located inside the air-conditioning explosion-proof cabinet (3). The two ends of the connecting rod (135) are fixedly connected to the inner wall of the air-conditioning explosion-proof cabinet (3).

7. The online multi-parameter integrated detection device for produced water quality in oil and gas fields according to claim 6, characterized in that: The one-way valve (137) is unidirectionally open to the inside of the cleaning water inlet flange (11), and the circumferential surface of the heat-conducting pipe (136) is in contact with the side of the PLC control unit (21).

8. The online multi-parameter integrated detection device for produced water quality in oil and gas fields according to claim 7, characterized in that: The heat pipe (136) is provided with a wind circulation device (15) on its circumferential surface. The wind circulation device (15) includes a guide pipe (151). One end of the guide pipe (151) is fixedly inserted through the circumferential surface of the heat pipe (136). A vortex pipe (152) is fixedly inserted through the other end of the guide pipe (151). A rotating shaft (153) is inserted through and rotatably connected to the circumferential surface of the vortex pipe (152). A vortex fan (154) is fixedly connected to one end of the rotating shaft (153). A fan blade (155) is fixedly connected to the end of the rotating shaft (153) away from the vortex fan (154). A solenoid valve A (156) is provided on the circumferential surface of the heat pipe (136). A solenoid valve B (157) is provided on the circumferential surface of the guide pipe (151).

9. The online multi-parameter integrated detection device for produced water quality in oil and gas fields according to claim 8, characterized in that: The other end of the flow guide (151) is fixedly connected to the circumferential surface of the heat conduction pipe (136), and the solenoid valve B (157) is located at the interface between the heat conduction pipe (136) and the flow guide (151).

10. The online multi-parameter integrated detection device for produced water quality in oil and gas fields according to claim 9, characterized in that, The circumferential surface of the rotating shaft (153) and the circumferential surface of the guide tube (151) interpenetrate each other, and the vortex fan (154) is located inside the guide tube (151).

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