Movable offshore oilfield injection water quality on-line monitoring device

Abstract

The invention relates to a movable offshore oilfield injection water quality online monitoring device, and relates to the technical field of water quality monitoring. The system comprises a mobile platform, an oil detection module, a total iron detection module, a sulfide detection module, a water quality detection module, a water quality treatment module, a cleaning module and a sampling module which are arranged on the mobile platform, and a detection branch pipe arranged on the oil detection module, the water quality detection module comprises a PH detector, a corrosion rate detector, a dissolved oxygen detector, a suspended matter detector and a buffer tank which are arranged on the mobile platform, and the oil detection module, the PH detector, the corrosion rate detector, the dissolved oxygen detector, the suspended matter detector and the buffer tank are all communicated with a detection branch pipe; and two water control pieces are arranged on the detection branch pipe. According to the application, each detector can detect the water quality in the optimal detection period, each detector can detect the water quality at the same time, and the accuracy and timeliness of each data can be ensured in different detection periods according to the characteristics of each parameter.

Description

Technical Field

[0001] The present application relates to the technical field of water quality monitoring, and in particular to a movable online monitoring device for water quality of offshore oilfield injection water. Background Art

[0002] An offshore platform is a truss structure that is above sea level and has a horizontal surface for production operations or other activities.

[0003] In the field of offshore oil development technology, it is necessary to simultaneously monitor the water quality of the offshore platform, such as oil, suspended solids, dissolved oxygen, corrosion rate, total iron, sulfide, pH and other parameters, online, in order to timely adjust the production water treatment process of the offshore oil field and timely guide the water injection operation of the offshore oil field. For example, the Chinese patent with the publication number CN110174379A in the relevant technology proposes a multi-parameter water quality monitoring device and method, which includes a main control unit, a reaction analysis unit, a reagent storage unit, a waste liquid recovery unit and a sampling unit. The reaction analysis unit modularizes multiple pollutant analysis units, quickly adds or adjusts monitoring parameters according to different monitoring scenarios, and can plug and unplug the required pollutant parameter analysis module, which has a simple structure, flexible combination, and reduced measurement cost; each unit inside the device self-organizes the network and communicates wirelessly with the main control unit. The main control unit supports remote data transmission and local storage, which is particularly suitable for river sewage and industrial wastewater monitoring.

[0004] With respect to the above-mentioned related technologies, the inventors believe that the following defects exist: Currently, multiple different detectors are usually installed on pipelines to detect multiple parameters such as oil, suspended matter, dissolved oxygen, corrosion rate, total iron, sulfide and pH in marine water quality. However, multiple detectors are installed on one pipeline, so that each detector detects the seawater quality at the same time. Although this detection method is efficient, it is easy to cause interference when each detector detects the water quality at the same time, because the simultaneous operation of multiple detectors will produce electromagnetic interference or chemical reactions, affecting the accuracy of the measurement results, and it is not convenient for each detector to detect the water quality in the optimal detection cycle. When each detector detects the water quality at the same time, it is impossible to ensure the accuracy and timeliness of each data in different detection cycles according to the characteristics of each parameter, which will affect the effect of seawater quality detection. Summary of the invention

[0005] In order to solve the problem of installing multiple detectors on one pipeline so that each detector detects the seawater quality at the same time, although this detection method is highly efficient, interference is prone to occur when each detector detects the water quality at the same time, because the simultaneous operation of multiple detectors will produce electromagnetic interference or chemical reactions, affecting the accuracy of the measurement results. The present application provides a movable online monitoring device for offshore oilfield injection water quality.

[0006] The present application provides a mobile online monitoring device for water quality of offshore oilfield injection water, which adopts the following technical solution: A mobile on-line monitoring device for water quality of offshore oilfield water injection, comprising a mobile platform, an oil measuring module arranged on the mobile platform, a total iron detection module, a sulfide detection module, a water quality detection module, a water quality treatment module, a cleaning module and a sampling module, and a detection branch pipe arranged on the oil measuring module; The water quality detection module includes a pH detector, a corrosion rate detector, a dissolved oxygen detector, a suspended matter detector and a buffer tank arranged on a mobile platform, and the oil measurement module, the pH detector, the corrosion rate detector, the dissolved oxygen detector, the suspended matter detector and the buffer tank are all connected to a detection branch pipe, and two water control parts are arranged on the detection branch pipe; A power pipe and a water supply pipe are arranged on the outside of the detection branch pipe, and the power pipe, the pH detector, the corrosion rate detector, the dissolved oxygen detector and the suspended matter detector are all connected to the water supply pipe, and the pH detector, the corrosion rate detector, the dissolved oxygen detector and the suspended matter detector are all provided with a water inlet component and a water discharge component for automatic water inlet and water discharge; The water inlet assembly includes water inlet plates movably arranged on the pH detector, the corrosion rate detector, the dissolved oxygen detector and the suspended matter detector, and four water inlet parts respectively used to translate the four water inlet plates, and the power pipe is provided with a driving part for driving the four water inlet parts; The drainage assembly includes a drainage board movably arranged on the pH detector, the corrosion rate detector, the dissolved oxygen detector and the suspended matter detector, and four limiting members respectively used to limit the four drainage boards, and the four drainage boards are all movably fitted with the water supply pipe; The power tube is provided with a control component for controlling the liquid input amount and a power component for timing driving the driving member. The power component includes a power plate movably arranged on the inner side of the power tube and a lifting member for lifting the power plate. The power tube is provided with a positioning member for positioning the power plate, and the water supply pipe is provided with a power member for automatically driving the positioning member.

[0007] By adopting the above technical scheme, the hot water and cold water of the water quality can be detected respectively through two temperature detectors, and the heated hot water and the cooled cold water can be blocked and limited respectively through two water control parts, so as to control the water quality to be heated or cooled to a specified temperature. By setting the water inlet component, the liquid inside the detection branch pipe can be placed inside the pH detector, the corrosion rate detector, the dissolved oxygen detector and the suspended matter detector respectively, so as to detect the pH, corrosion rate, dissolved oxygen and suspended matter of the water quality by the pH detector, the corrosion rate detector, the dissolved oxygen detector and the suspended matter detector respectively. The four water inlet parts can be used to control the water quality to be heated or cooled to a specified temperature. The frequency and time of liquid entering the pH detector, corrosion rate detector, dissolved oxygen detector and suspended matter detector can be driven synchronously by the driving part, and the driving part can be driven automatically by the lifting part in the power component. The liquid inside the pH detector, corrosion rate detector, dissolved oxygen detector and suspended matter detector can be discharged by setting the drainage component. The flow rate of liquid entering the water supply pipe can be controlled by setting the control component. The lifting part can be positioned by the positioning part to facilitate rapid drainage of the inside of the water supply pipe. The positioning part can be driven by the power part to facilitate the lifting part to return to the specified position.

[0008] The monitoring devices in the prior art are usually only applicable to the detection of conventional water bodies such as river sewage and industrial wastewater. The detection conditions are usually normal temperature and pressure. There are no specific strict requirements on the equipment volume, salt spray resistance, corrosion resistance, explosion-proof and protection level, and unmanned duty. Therefore, this type of equipment is usually not suitable for online water quality monitoring in offshore oil fields. In addition, the air on the offshore platform is humid and saturated with salt spray. Due to the temperature difference between day and night, the salt spray in the air adheres to the equipment body to crystallize and grow. The crystallization of air salt spray and the wild growth of salt crystals will quickly destroy the sealing structure of the offshore instrument. After the sealing structure is damaged, air and water penetrate into the detection probe to destroy the working chip of the probe, thereby causing the working chip to short-circuit and burn, causing the instrument to fail quickly. The produced water of offshore oil fields is characterized by high temperature, high pressure, high mineralization, high chloride ion content, and contains mineral oil, suspended solids, sulfide, carbon dioxide, sulfate-reducing bacteria, iron bacteria, saprophytes, and various oilfield development additives. It is a complex and extremely unstable water body with high temperature, high pressure, and extremely strong corrosiveness. This kind of water body will quickly corrode and pollute the online monitoring probe under high temperature and high pressure environment, especially organic oil scale and inorganic dirt attached to the sensitive parts of the sensor, causing the sensor to fail quickly. The equipment used for online monitoring of water quality of offshore platform injection water is usually arranged on the offshore platform, and has high requirements for instrument explosion-proof and protection, instrument space volume, instrument accuracy and precision, stability and reliability. For some unmanned platforms, the equipment is required to be able to operate continuously and stably for at least 30 days without human intervention. Therefore, based on the above situation, it is necessary to develop a multi-parameter intelligent online monitoring device for water quality of offshore platform injection water to replace the high cost and timeliness of manual detection; At the same time, although the optimized monitoring device also has the advantage of timed sampling of seawater, it requires staff to manually operate each detector to sample the seawater quality in order to achieve the purpose of online detection of various seawater parameters. The time for water quality sampling varies depending on the seawater detection parameters. For some polluted seawater, suspended matter, dissolved oxygen, corrosion rate and pH need to be sampled and tested frequently. pH usually requires at least one monitoring data every ten minutes, corrosion rate usually requires at least one monitoring data every thirty minutes, dissolved oxygen usually requires at least one monitoring data every sixty minutes, and suspended matter usually requires at least one monitoring data every minute. Therefore, staff are required to frequently test the water quality. Frequent sampling of seawater quality will increase the labor intensity of staff, and they must accurately calculate the time for water quality sampling. Moreover, if the time for seawater quality sampling is missed, the effect of seawater quality detection will be affected.

[0009] The detection cycles of pH detectors, corrosion rate detectors, dissolved oxygen detectors and suspended matter detectors for water quality are different. pH detectors, corrosion rate detectors, dissolved oxygen detectors and suspended matter detectors can sample and test water quality at the best time.

[0010] Optionally, the control component includes a water control plate movably arranged on the power tube, a threaded rod rotatably arranged on the power tube, a fixing frame fixed on the power tube, and a motor fixed on the fixing frame, the threaded rod is fixedly connected to the output end of the motor, the water control plate is threadedly connected to the threaded rod, a connecting square hole is opened on the inner side of the power tube, and the water control plate is slidably connected to the connecting square hole.

[0011] By adopting the above technical solution, the threaded rod can be driven to rotate by the motor, which in turn drives the water control plate to translate on the inner side of the power tube. The distance between the water control plate and the power tube can be controlled to control the flow rate of the liquid, so as to facilitate the automatic driving of the lifting member by the gravity of the liquid.

[0012] Optionally, the lifting member includes a rotating shaft rotatably set on the detection branch pipe, a movable gear fixed on the rotating shaft, a first power plate, a second power plate, a third power plate and a fourth power plate, two compression springs fixed at the bottom of the power plate, and a movable rack movably set in the power tube, the movable gear is movably engaged with the movable rack, the movable rack is fixedly connected to the power plate, the power tube is rotatably connected to the rotating shaft, the two compression springs are fixedly connected to the power tube, the number of the first power plates is five, and the five first power plates are movably fitted with the movable cone blocks on the pH detector, the number of the second power plates is two, and the two second power plates are movably fitted with the movable cone blocks on the corrosion rate detector, the third power plate is movably fitted with the movable cone block on the dissolved oxygen detector, and the number of the fourth power plates is eight, and the eight fourth power plates are movably fitted with the movable cone blocks on the suspended matter detector.

[0013] By adopting the above technical solution, when the lifting member is driven by gravity, it will drive the power plate and the movable rack to move downward in turn, and then drive the movable gear, the rotating shaft, the first power plate, the second power plate, the third power plate and the fourth power plate to rotate in turn, and then the pH detector, the corrosion rate detector, the dissolved oxygen detector and the suspended matter detector will be opened at a timed interval respectively. By rotating the five first power plates, the two second power plates, the third power plates and the eight fourth power plates, the opening time and frequency of the four water inlet plates can be controlled respectively. By the number of the first power plates, the second power plates, the third power plates and the fourth power plates, the pH detector can be controlled to obtain at least one monitoring data every ten minutes, the corrosion rate detector can obtain at least one monitoring data every thirty minutes, the dissolved oxygen detector can obtain at least one monitoring data every sixty minutes, and the suspended matter detector can obtain at least one monitoring data every minute.

[0014] Optionally, the water inlet component includes a movable cone block fixed on the water inlet plate and a coil spring fixed on the movable cone block. The number of the movable cone block and the coil spring are four. The four coil springs are respectively fixedly connected to the pH detector, the corrosion rate detector, the dissolved oxygen detector and the suspended matter detector. Fixed square holes are opened on the inner sides of the four pH detectors, the corrosion rate detectors, the dissolved oxygen detectors and the suspended matter detectors. The four water inlet plates are respectively slidably connected to the four fixed square holes.

[0015] By adopting the above technical solution, the four movable cone blocks will be pushed respectively through the rotation of the first power plate, the second power plate, the third power plate and the fourth power plate, so that the four spiral springs are in a compressed state respectively, and then the four water inlet plates can be driven to move respectively, and then the pH detector, corrosion rate detector, dissolved oxygen detector and suspended matter detector can be opened, so that the pH detector, corrosion rate detector, dissolved oxygen detector and suspended matter detector can respectively detect the pH, corrosion rate, dissolved oxygen and suspended matter of the water quality.

[0016] Optionally, the water control component includes a movable baffle movably arranged on the detection branch pipe and an electric push rod fixed on the detection branch pipe, the number of the movable baffle and the electric push rod are two, the two electric push rods are respectively fixedly connected to the two movable baffles, the detection branch pipe is provided with two fixed through holes, the two movable baffles are respectively slidably connected to the two fixed through holes, two temperature detectors are arranged on the detection branch pipe, a cooler is arranged on the outer side of the detection branch pipe, and a hot water pump is arranged on the outer side of the detection branch pipe.

[0017] By adopting the above technical scheme, the water quality for injection can be heated by a hot water pump, and the temperature of the heated water quality for injection can be detected by a temperature detector. When the water quality for injection is heated to about seventy degrees, the movable baffle can be driven up and down by an electric push rod to discharge the heated water quality inside the detection branch pipe, and the heated water quality will be detected by a PH detector and a corrosion rate detector. At the same time, when the water quality for injection passes through a cooler, the water quality can be cooled, and the cooling temperature of the water quality for injection can be detected by another temperature detector. When the water quality for injection is heated to below thirty degrees, the movable baffle can be driven up and down by an electric push rod to discharge the cooled water quality inside the detection branch pipe, and the cooled water quality will be detected by a dissolved oxygen detector and a suspended matter detector.

[0018] Optionally, the power component includes a connecting shaft rotatably arranged on the power tube, five waterwheel plates and a take-up wheel fixed on the connecting shaft, a limiting wheel fixed on the power tube, a movable pin movably arranged on the power tube, and an annular spring, a limiting cone block and a movable pull wire fixed on the movable pin, the movable pull wire is wound around the outer side of the take-up wheel, the movable pull wire is movably connected to the limiting wheel, the annular spring is fixedly connected to the power tube, the limiting cone block is movably fitted with the power plate, the five waterwheel plates are evenly distributed on the outer side of the connecting shaft, a water inlet cavity is opened on the inner side of the power tube, and the waterwheel plates are located on the inner side of the water inlet cavity.

[0019] By adopting the above technical scheme, when the power plate moves to the limiting cone block due to the gravity of the liquid, the annular spring is in a compressed state, which can drive the limiting cone block and the movable pin to move in turn, so that the power plate can be smoothly moved to the bottom of the limiting cone block. At this time, the power plate will be flush with the water inlet chamber, so that the liquid above the power plate will flow into the inner side of the water inlet chamber, and the liquid will be flushed to the top of multiple waterwheel plates. Through the flushing of the liquid, multiple waterwheel plates, connecting shafts and wire-winding wheels can be driven to rotate in turn. When the wire-winding wheel rotates, the movable pull line can be wound up, which will put the annular spring in a compressed state, which can drive the limiting cone block and the movable pin to move slowly in turn, so that the liquid on the power plate can completely flow into the water inlet chamber and then flow into the inner side of the water supply pipe, thereby achieving the purpose of completely draining the power pipe. When the movable pull line is wound up to completely separate the limiting cone block from the power plate, the power plate can be bounced back to its original position through the elastic force of the two compression springs.

[0020] Optionally, the limiting component includes an air spring and a telescopic rod fixed on the drain board, and a limiting arc block fixed on the air spring, the limiting arc block is fixedly connected to the telescopic rod, the drain board, the air spring, the limiting arc block and the telescopic rod are four in number, the inner sides of the pH detector, the corrosion rate detector, the dissolved oxygen detector and the suspended matter detector are all provided with arc grooves arranged at equal distances, and the limiting arc block is clamped in the arc grooves.

[0021] By adopting the above technical scheme, when the liquid enters the inner side of the pH detector, corrosion rate detector, dissolved oxygen detector and suspended matter detector, the liquid first contacts the drain board and moves upward through the buoyancy of the drain board, which puts the air spring in an extruded state and causes the drain board to lose its limit. Through the cooperation of multiple arc grooves, air springs, telescopic rods and limit arc blocks, the drain board can be slowly moved upward or downward. When the drain board moves upward or downward, the water inlet of the water supply pipe can be opened or closed, so that the liquid inside the pH detector, corrosion rate detector, dissolved oxygen detector and suspended matter detector can flow into the inner side of the water supply pipe, and the liquid will flow into the inner side of the buffer tank.

[0022] Optionally, the sampling module includes a water pump, to which a water supply pipeline is connected, one side of the water pump is connected in parallel with a detection pipeline A and a detection pipeline B, the outside of the detection pipeline A is connected to a sampling cup, the total iron detection module and the sulfide detection module are connected to the sampling cup, the output end of the sampling cup is connected to a drain pipe through a pipeline and a valve, the outside of the detection pipeline B is connected to a rectifier, and the detection pipeline B is connected in parallel with an oil measuring module and a detection branch pipe through the rectifier.

[0023] By adopting the above technical solution, the injection water quality entering the detection pipeline A will flow into the sampling cup. After the injection water quality enters the sampling cup, the sulfide detection module transports the injection water quality and the prepared liquid in each preparation bottle to the detection pool A through the analysis pump and the multi-way valve A, and completes the sulfide detection through the sulfide detector. At the same time, the total iron detection module transports the injection water quality and the prepared liquid in each preparation bottle to the detection pool B through the analysis pump and the multi-way valve A, and completes the total iron content detection through the total iron detector.

[0024] Optionally, the water quality treatment module includes a chemical tank, a dosing pump and a water separator, the chemical tank is connected in parallel with a cleaning pipeline and a circulation pipeline through a dosing pump and a valve, the cleaning pipeline is connected to a detection pipeline B, the outside of the circulation pipeline is connected to a cleaning pump, the circulation pipeline is connected to the bottom of the buffer tank through the cleaning pump, the water separator is connected to the chemical tank, the rectifier and the buffer tank through pipelines, and the output end of the water separator is connected to a drainage pipe.

[0025] By adopting the above technical solution, after the cleaning liquid is injected into the reagent tank, the dosing pump can input the cleaning liquid in the reagent tank into the rectifier through the dosing pump, and then the dosing pump is turned off; then the cleaning pump is started, so that the cleaning pump will allow the cleaning agent entering the rectifier to circulate continuously in a circulation circuit formed by a pH detector, a corrosion rate detector, a cooler, a dissolved oxygen detector, a suspended matter detector, a buffer tank and a circulation pipeline connected in series at one end of the oil measuring module and the detection branch pipe, so as to achieve the purpose of cleaning each detection instrument.

[0026] Optionally, the sulfide detection module includes a multi-way valve A, a detection pool A, a sulfide detector, a washing pump and an analysis pump, the multi-way valve A is connected to the washing pump, the analysis pump and a plurality of liquid preparation bottles through pipelines, the multi-way valve A is connected to the detection pool A through pipelines, and the detection pool A is equipped with a sulfide detector; The total iron detection module includes a multi-way valve B, a detection pool B, a total iron detector, a washing pump and an analysis pump. The multi-way valve B is connected to the washing pump, the analysis pump and a plurality of liquid preparation bottles through a pipeline. The multi-way valve B is connected to the detection pool B through a pipeline, and the detection pool B is equipped with a total iron detector.

[0027] By adopting the above technical solution, the washing pumps in the sulfide detection module and the total iron detection module suck cleaning water from the cleaning tank to clean the multi-way valve A and the multi-way valve B and the corresponding detection pool A and the detection pool B, and finally enter the waste liquid tank, so that the cleaning of the sulfide detection module and the total iron detection module can be completed. After the cleaning is completed, the sulfide detection module and the total iron detection module can enter the next detection work, and the waste liquid entering the waste liquid tank is finally discharged through the drain pipe.

[0028] In summary, the present application includes at least one of the following beneficial technical effects: 1. Under the operation of the water intake pump, the water quality of the injection water is input into the detection pipeline A and the detection pipeline B, and then enters the inner side of the detection pipeline B, the clean water branch and the detection branch. First, the oil content in the water is detected by the oil measuring module and then merged with the water quality of the injection water in the detection branch. The water quality of the injection water can be heated by the hot water pump, and the temperature of the heating of the water quality of the injection water can be detected by the temperature detector. When the water quality of the injection water is heated to about 70 degrees, the movable baffle can be driven up and down by the electric push rod to discharge the heated water quality inside the detection branch. The heated water quality will be detected by the PH detector and the corrosion rate detector. At the same time, when the water quality of the injection water passes through the cooler, the water quality can be cooled down. The cooling temperature of the water quality of the injection water can be detected by another temperature detector. When the water quality of the injection water is heated to below 30 degrees, the movable baffle can be driven up and down by the electric push rod to discharge the cooled water quality inside the detection branch. The cooled water quality will be detected by the dissolved oxygen detector and the suspended matter detector; 2. The threaded rod can be driven to rotate by the motor. Since the threaded rod is threadedly connected to the water control plate, when the threaded rod rotates, it will drive the water control plate to translate on the inner side of the power tube. The distance between the water control plate and the power tube can be controlled to control the flow rate of the liquid, thereby creating a gap on the inner side of the power tube. The size of the gap can be controlled according to the degree of seawater pollution, and the time frequency of seawater detection by the PH detector 10, the corrosion rate detector 11, the dissolved oxygen detector 13 and the suspended matter detector 14 can be controlled, thereby making the liquid on the inner side of the detection branch pipe flow to the top of the water control plate through the gap. The water control plate can be gradually added with liquid to control the flow rate of the liquid. The upper part gradually increases in weight, which in turn drives the power plate and the movable rack to move downward, so that the two compression springs are in a compressed state. Because the movable rack is meshed with the movable gear, the movable rack will drive the movable gear, the rotating shaft, the first power plate, the second power plate, the third power plate and the fourth power plate to rotate in turn when it moves downward. When the first power plate, the second power plate, the third power plate and the fourth power plate rotate, they will push the four movable cone blocks respectively, so that the four spiral springs are in a compressed state respectively, and then they can drive the four water inlet plates to move respectively, and then the pH detector, corrosion rate detector, dissolved oxygen detector and suspended solids detector can be checked. The detector is turned on, and hot water at about 70 degrees enters the inner side of the pH detector and the corrosion rate detector respectively, and cold water below 30 degrees enters the inner side of the dissolved oxygen detector and the suspended matter detector respectively. Then, the pH, corrosion rate, dissolved oxygen and suspended matter of the water quality can be tested respectively through the pH detector, the corrosion rate detector, the dissolved oxygen detector and the suspended matter detector. The tested water quality will flow into the buffer tank. In this way, the process can complete the oil content detection, pH detection, corrosion rate detection, dissolved oxygen detection and suspended matter detection in the water. Through five first power sheets, two second power sheets, the third power sheet and The rotation of the eight fourth power sheets can control the opening time and frequency of the four water inlet plates respectively. Through the number of the first power sheet, the second power sheet, the third power sheet and the fourth power sheet, the pH detector can be controlled to obtain at least one monitoring data every ten minutes, the corrosion rate detector can obtain at least one monitoring data every thirty minutes, the dissolved oxygen detector can obtain at least one monitoring data every sixty minutes, and the suspended matter detector can obtain at least one monitoring data every minute. The data detected by the pH detector, the corrosion rate detector, the dissolved oxygen detector and the suspended matter detector can be recorded through the intelligent controller to ensure the effect of seawater quality detection; 3. When the liquid enters the inner side of the pH detector, corrosion rate detector, dissolved oxygen detector and suspended solids detector, it first contacts the drain board through the liquid, and can move upward through the buoyancy of the drain board. The drain board can be limited by the sliding block and the sliding groove, so that the drain board can move vertically upward. At the same time, when the drain board moves upward, the air spring is in an extruded state, so that the limiting arc block enters the inner side of the drain board, so that the drain board loses its limit. Through the cooperation of multiple arc grooves, air springs, telescopic rods and limiting arc blocks, the drain board can be slowly moved up or down. When the drain board moves up or down, the water inlet of the water supply pipe can be opened or closed, so that the pH The liquid inside the pH detector, corrosion rate detector, dissolved oxygen detector and suspended solids detector flows into the inside of the water supply pipe, and then the liquid flows into the inside of the buffer tank. This method can slowly move the drain plate up or down to ensure that the liquid inside the pH detector, corrosion rate detector, dissolved oxygen detector and suspended solids detector is completely discharged. At the same time, the liquid can stay inside the pH detector, corrosion rate detector, dissolved oxygen detector and suspended solids detector for a period of time to ensure the effectiveness of the pH detector, corrosion rate detector, dissolved oxygen detector and suspended solids detector in detecting water quality pH, corrosion rate, dissolved oxygen and suspended solids. When the power plate moves to the When the limit cone block is on the limit cone block, the annular spring is in a compressed state, which can drive the limit cone block and the movable pin to move in turn, so that the power plate can be smoothly moved to the bottom of the limit cone block, so that the power plate and the top of the limit cone block fit together. At this time, the power plate will be flush with the water inlet chamber, so that the liquid above the power plate will flow into the inner side of the water inlet chamber, and the liquid will be flushed to the top of multiple water wheel plates, and then through the flushing of the liquid, the multiple water wheel plates, the connecting shaft and the take-up wheel can be driven to rotate in turn. When the take-up wheel rotates, the movable pull line can be reeled in, which will put the annular spring in a compressed state, and then the limit cone block and the movable pin can be driven to move slowly in turn, so that the liquid on the power plate can completely flow into the water inlet The liquid in the cavity will then flow into the inner side of the water delivery pipe, achieving the purpose of completely draining the power pipe. When the movable pull line is reeled in to completely separate the limit cone block from the power plate, the power plate can be rebounded to its original position by the elastic force of the two compression springs, so that the pH detector, corrosion rate detector, dissolved oxygen detector and suspended matter detector can frequently detect the liquid again. Each detector can detect the water quality in the best detection cycle. Each detector can detect the water quality at the same time. The accuracy and timeliness of each data can be ensured in different detection cycles according to the characteristics of each parameter, avoiding interference caused by each detector detecting the water quality at the same time, and ensuring the effect of seawater quality detection. 4. Therefore, through the above principle, the five first power sheets can control the pH detector to obtain a monitoring data every ten minutes, the two second power sheets can control the corrosion rate detector to obtain a monitoring data every thirty minutes, the third power sheet can control the dissolved oxygen detector to obtain a monitoring data every sixty minutes, and the eight fourth power sheets can control the suspended matter detector to obtain a monitoring data every minute. At the same time, when the rotating shaft controls the eight fourth power sheets to sample the suspended matter detector, the five first power sheets, the two second power sheets and the third power sheet will also swing to have an energy storage effect, and also swing to control the time, so as to accurately control the five first power sheets to the pH detector. There is no need to calculate the time for the pH detector, corrosion rate detector and dissolved oxygen detector separately. When the eight fourth power sheets sample the suspended matter detector every minute, the five first power sheets, two second power sheets and one third power sheet are also rotating, preparing for energy storage with the sampling time of the pH detector, corrosion rate detector and dissolved oxygen detector, and also performing precise sampling time control to ensure that the pH detector, corrosion rate detector, dissolved oxygen detector and suspended matter detector can accurately sample water quality at precise time respectively. BRIEF DESCRIPTION OF THE DRAWINGS

[0029] Figure 1 It is a schematic diagram of the overall structure of an embodiment of the present application; Figure 2 Appearance diagram of the detection branch pipe connection structure in the embodiment of the present application; Figure 3 A cross-sectional view of the detection branch pipe connection structure in the embodiment of the present application; Figure 4 A cross-sectional view of the power tube connection structure in the embodiment of the present application; Figure 5 Appearance diagram of the fixing frame connection structure in the embodiment of the present application; Figure 6 A cross-sectional view of the connection structure of the suspended matter detector in the embodiment of the present application; Figure 7 Front view of the connection structure of the suspended matter detector in the embodiment of the present application; Figure 8 Embodiments of the present application Figure 7 Enlarged view of point A in the middle; Fig. 9 This is a schematic diagram of the detection branch pipe in the embodiment of the present application; Fig.10 This is a schematic diagram of the detection pipeline B in the embodiment of the present application; Fig.11 This is a schematic diagram of the detection pipeline A in the embodiment of the present application; Fig.12This is a schematic diagram of the structure of the total iron detection module in the embodiment of the present application; Fig.13 This is a schematic diagram of the cleaning pipeline in the embodiment of the present application; Fig.14 This is a schematic diagram of the clean water branch pipe in the embodiment of the present application; Fig.15 This is a schematic diagram of the structure of the water separator in the embodiment of the present application; Fig.16 This is a structural schematic diagram of the oil measurement module in the embodiment of the present application; Fig.17 This is a schematic diagram of the cleaning state structure of the oil measuring module in the embodiment of the present application.

[0030] Figure numerals: 1, mobile platform; 2, water pump; 3, detection pipeline A; 4, detection pipeline B; 5, sampling cup; 6, drainage pipe; 7, rectifier; 8, oil measurement module; 9, detection branch pipe; 10, pH detector; 11, corrosion rate detector; 12, cooler; 13, dissolved oxygen detector; 14, suspended matter detector; 15, buffer tank; 16, waste pipe; 17, waste pump; 18, cooling water pipe; 19, seawater valve; 20, drainage pipe; 21, reagent tank; 22, dosing pump; 23, cleaning pipeline; 24 , circulation pipeline; 25, cleaning pump; 26, water distributor; 27, drainage ground pipe; 28, clean water branch pipe; 29, hot water pump; 30, multi-way valve A; 31, detection tank A; 32, sulfide detector; 33, washing pump; 34, analysis pump; 35, liquid preparation bottle; 36, multi-way valve B; 37, detection tank B; 38, total iron detector; 39, cleaning tank; 40, waste liquid tank; 41, inspection liquid tank; 42, total iron detection module; 43, sulfide detection module; 44, infrared photoelectric detector; 45, transparent glass tube; 46, Assembly kit; 47, mounting seat; 48, sliding rod; 49, cleaning brush head; 50, magnetic ring; 51, magnetic block; 52, sliding chamber; 53, push cylinder; 54, reset spring; 55, water quality detection module; 56, water quality treatment module; 57, cleaning module; 58, sampling module; 59, power tube; 60, water supply pipe; 61, electric push rod; 62, movable baffle; 63, temperature detector; 64, water inlet plate; 65, movable cone block; 66, spiral spring; 67, fixing bracket; 68, motor; 69, thread Rod; 70, water control plate; 71, power plate; 72, compression spring; 73, movable rack; 74, movable gear; 75, rotating shaft; 76, first power plate; 77, second power plate; 78, third power plate; 79, fourth power plate; 80, connecting shaft; 81, waterwheel plate; 82, take-up wheel; 83, limiting wheel; 84, movable pin; 85, movable pull line; 86, annular spring; 87, limiting cone block; 88, drainage plate; 89, air spring; 90, limiting arc block; 91, telescopic rod; 92, intelligent controller. DETAILED DESCRIPTION

[0031] The following is combined with Figure 1-17 This application is described in further detail.

[0032] The present application embodiment discloses a mobile on-line monitoring device for water quality of offshore oilfield injection water, referring to Figure 1 and Figure 2 , including a mobile platform 1, an oil measuring module 8 arranged on the mobile platform 1, a total iron detection module 42, a sulfide detection module 43, a water quality detection module 55, a water quality treatment module 56, a cleaning module 57 and a sampling module 58, and a detection branch pipe 9 arranged on the oil measuring module 8; the water quality detection module 55 includes a PH detector 10, a corrosion rate detector 11, a dissolved oxygen detector 13, a suspended matter detector 14 and a buffer tank 15 arranged on the mobile platform 1, the oil measuring module 8, the PH detector 10, the corrosion rate detector 11, the dissolved oxygen detector 13, the suspended matter detector 14 and the buffer tank 15 The instrument 14 and the buffer tank 15 are both connected to the detection branch pipe 9. Two water control parts are arranged on the detection branch pipe 9. A waste pipe 16 is fixedly connected to the outside of the buffer tank 15. A waste pump 17 is fixedly connected to the outside of the waste pipe 16. The liquid in the buffer tank 15 can be discharged through the waste pipe 16 and the waste pump 17. A power pipe 59 and a water supply pipe 60 are fixedly connected to the outside of the detection branch pipe 9. The power pipe 59, the pH detector 10, the corrosion rate detector 11, the dissolved oxygen detector 13 and the suspended matter detector 14 are all connected to the water supply pipe 60. The pH detector 10, the corrosion rate detector 11, The dissolved oxygen detector 13 and the suspended matter detector 14 are both provided with a water inlet assembly and a water discharge assembly for automatic water inlet and water discharge; the water inlet assembly includes a water inlet plate 64 movably arranged on the pH detector 10, the corrosion rate detector 11, the dissolved oxygen detector 13 and the suspended matter detector 14, and four water inlet parts respectively used to translate the four water inlet plates 64, and a driving part for driving the four water inlet parts is provided on the power pipe 59; the water discharge assembly includes a water inlet plate 64 movably arranged on the pH detector 10, the corrosion rate detector 11, the dissolved oxygen detector 13 and the suspended matter detector 14, and four water inlet parts respectively used to translate the four water inlet plates 64, and a driving part for driving the four water inlet parts is provided on the power pipe 59; The instrument 14 includes a drain plate 88 and four limit members for limiting the four drain plates 88 respectively. The four drain plates 88 are movably fitted with the water supply pipe 60. The power tube 59 is provided with a control component for controlling the liquid input amount and a power component for timing driving the driving member. The power component includes a power plate 71 movably arranged on the inner side of the power tube 59 and a lifting member for lifting the power plate 71. The power tube 59 is provided with a positioning member for positioning the power plate 71, and the water supply pipe 60 is provided with a power member for automatically driving the positioning member.

[0033] The lifting member includes a rotating shaft 75 rotatably arranged on the detection branch pipe 9, a movable gear 74 fixed on the rotating shaft 75, a first power sheet 76, a second power sheet 77, a third power sheet 78 and a fourth power sheet 79, two compression springs 72 fixed to the bottom of the power plate 71, and a movable rack 73 movably arranged in the power tube 59, the movable gear 74 is movably engaged with the movable rack 73, the movable rack 73 is fixedly connected to the power plate 71, the power tube 59 is rotatably connected to the rotating shaft 75, the two compression springs 72 are both fixedly connected to the power tube 59, a rack hole is opened at the bottom of the power tube 59, and the movable rack 73 is slidably connected to the rack hole. The movable gear 74 is located on the inner side of the power tube 59, the number of the first power plates 76 is five, and the five first power plates 76 are movably fitted with the movable cone block 65 on the pH detector 10, the number of the second power plates 77 is two, and the two second power plates 77 are movably fitted with the movable cone block 65 on the corrosion rate detector 11, the third power plate 78 is movably fitted with the movable cone block 65 on the dissolved oxygen detector 13, the number of the fourth power plates 79 is eight, and the eight fourth power plates 79 are movably fitted with the movable cone block 65 on the suspended matter detector 14, the power plate 71 is a density solid plate, and the two compression springs 72 are cast from fine steel wire.

[0034] The water inlet component includes a movable cone block 65 fixed on the water inlet plate 64 and a coil spring 66 fixed on the movable cone block 65. The number of the movable cone block 65 and the number of the coil spring 66 are four. The four coil springs 66 are respectively fixedly connected to the pH detector 10, the corrosion rate detector 11, the dissolved oxygen detector 13 and the suspended matter detector 14. The inner sides of the four pH detectors 10, the corrosion rate detector 11, the dissolved oxygen detector 13 and the suspended matter detector 14 are all provided with fixed square holes. The four water inlet plates 64 are respectively slidably connected to the four fixed square holes. The length of the water inlet plate 64 is equal to the length of the fixed square hole, and the height of the water inlet plate 64 is equal to the height of the fixed square hole.

[0035] The control component includes a water control plate 70 movably arranged on the power tube 59, a threaded rod 69 rotatably arranged on the power tube 59, a fixing frame 67 fixed on the power tube 59, and a motor 68 fixed on the fixing frame 67. The threaded rod 69 is fixedly connected to the output end of the motor 68, the water control plate 70 is threadedly connected to the threaded rod 69, a connecting square hole is opened on the inner side of the power tube 59, the water control plate 70 is slidably connected to the connecting square hole, the width of the water control plate 70 is equal to the width of the connecting square hole, and the height of the water control plate 70 is equal to the height of the connecting square hole.

[0036] The water control component includes a movable baffle 62 movably arranged on the detection branch pipe 9 and an electric push rod 61 fixed on the detection branch pipe 9. The number of the movable baffle 62 and the electric push rod 61 are both two. The two electric push rods 61 are fixedly connected to the two movable baffles 62 respectively. The two movable baffles 62 are both L-shaped. Two fixed through holes are opened on the detection branch pipe 9. The two movable baffles 62 are slidingly connected to the two fixed through holes respectively. The width of the movable baffle 62 is equal to the width of the fixed through hole, and the length of the movable baffle 62 is equal to the length of the fixed through hole. Two temperature detectors 63 are fixedly connected to the detection branch pipe 9. The two temperature detectors 63 are respectively located above the cooler 12 and the hot water pump 29, and the two movable baffles 62 are respectively located on the outside of the cooler 12 and the hot water pump 29.

[0037] The power component includes a connecting shaft 80 rotatably arranged on the power tube 59, five waterwheel plates 81 and a take-up wheel 82 fixed on the connecting shaft 80, a limiting wheel 83 fixed on the power tube 59, a movable pin 84 movably arranged on the power tube 59, and an annular spring 86 fixed on the movable pin 84, a limiting cone block 87 and a movable pull line 85. The movable pull line 85 is wound around the outer side of the take-up wheel 82, the movable pull line 85 is movably connected to the limiting wheel 83, the annular spring 86 is fixedly connected to the power tube 59, the limiting cone block 87 is located on the inner side of the power tube 59, the limiting cone block 87 is movably fitted with the power plate 71, a fixing hole is opened on the inner side of the power tube 59, the movable pin 84 is slidably connected to the fixing hole, the five waterwheel plates 81 are evenly distributed on the outer side of the connecting shaft 80, a water inlet cavity is opened on the inner side of the power tube 59, the waterwheel plates 81 are located on the inner side of the water inlet cavity, and the movable pull line 85 can be limited by the limiting wheel 83.

[0038] The limiting component includes an air spring 89 and a telescopic rod 91 fixed on the drain plate 88, and a limiting arc block 90 fixed on the air spring 89. The limiting arc block 90 is fixedly connected to the telescopic rod 91. The number of the drain plate 88, the air spring 89, the limiting arc block 90 and the telescopic rod 91 are all four. The inner sides of the pH detector 10, the corrosion rate detector 11, the dissolved oxygen detector 13 and the suspended matter detector 14 are all provided with arc grooves arranged at equal distances. The limiting arc block 90 is clamped in the arc groove. The telescopic rod 91 consists of an inner rod and an outer rod, and the inner rod is a solid rod, the outer rod is a hollow hole, and the inner rod and the outer rod are slidably connected.

[0039] The oil measuring module 8 and one end of the detection branch pipe 9 are connected in series with a PH detector 10, a corrosion rate detector 11, a cooler 12, a dissolved oxygen detector 13, a suspended matter detector 14 and a buffer tank 15. The injection water quality input by the detection pipeline B4 is about seventy degrees. After the oil content in the water is detected by the oil measuring module 8, it can be combined with the injection water quality in the detection branch pipe 9 and then be detected by the PH detector 10 and the corrosion rate detector 11. In this way, the purpose of small flow detection by the oil measuring module 8 and large flow detection by the PH detector 10 and the corrosion rate detector 11 can be met. The injection water quality after detection by the corrosion rate detector 11 is cooled to below thirty degrees by the cooler 12, and then detected by the dissolved oxygen detector 13 and the suspended matter detector 14 before flowing into the buffer tank 15.

[0040] The outside of the detection branch pipe 9 is fixedly connected with a cooler 12, the refrigerant inlet end of the cooler 12 is fixedly connected with a cooling water pipe 18, the outside of the cooling water pipe 18 is fixedly connected with a seawater valve 19, the refrigerant outlet end of the cooler 12 is fixedly connected with a drain pipe 20, the outside of the detection branch pipe 9 is connected with a clean water branch pipe 28, the outside of the detection branch pipe 9 is fixedly connected with a hot water pump 29, the outside of the clean water branch pipe 28 is fixedly connected with a rectifier 7, the clean water branch pipe 28 is connected with the inlet end of the rectifier 7, the outside of the detection branch pipe 9 is fixedly connected with three solenoid valves, the three solenoid valves are timed to open or close part of the detection branch pipe 9, during operation, cooling seawater can enter the cooler 12 through the cooling water pipe 18 and the seawater valve 19 to cool the injection water quality, and then be discharged into the sea through the drain pipe 20, so that the purpose of cooling the cooler 12 by using seawater can be achieved.

[0041] The purpose of setting the clean water branch pipe 28 and the hot water pump 29 is that when working, after the cleaning solution is used to complete the cleaning, the clean water can be heated by the hot water pump 29 and then input into each detection instrument through the clean water branch pipe 28 for further cleaning. In this way, the multi-parameter online monitoring device can not only detect the injection water quality of about 70 degrees through the pH detector 10 and the corrosion rate detector 11, but also use the dissolved oxygen detector 13 and the suspended matter detector 14 to detect the injection water quality below 30 degrees.

[0042] The sampling module 58 includes a water pump 2, to which a water supply pipeline is connected. One side of the water pump 2 is connected in parallel with a detection pipeline A3 and a detection pipeline B4. The outer side of the detection pipeline A3 is connected to a sampling cup 5. The total iron detection module 42 and the sulfide detection module 43 are connected to the sampling cup 5. The output end of the sampling cup 5 is connected to a drain pipe 6 through a pipeline and a valve. The outer side of the detection pipeline B4 is connected to a rectifier 7. The detection pipeline B4 is connected in parallel with an oil measuring module 8 and a detection branch pipe 9 through the rectifier 7. When working, the liquid in the sampling cup 5 can be discharged through the pipeline, valve and drain pipe 6. The rectifier 7 is an externally purchased equipment, and the rectifier 7 has the function of exhausting air and filtering particulate matter.

[0043] The water quality treatment module 56 includes a reagent tank 21, a dosing pump 22 and a water separator 26. The reagent tank 21 is connected in parallel with a cleaning pipeline 23 and a circulation pipeline 24 through the dosing pump 22 and a valve. The cleaning pipeline 23 is connected to the detection pipeline B4. The outer side of the circulation pipeline 24 is connected to a cleaning pump 25. The circulation pipeline 24 is connected to the bottom end of the buffer tank 15 through the cleaning pump 25. The water separator 26 is connected to the reagent tank 21, the rectifier 7 and the buffer tank 15 through a pipeline. The output end of the water separator 26 is connected to a drainage pipe 27.

[0044] During operation, after the cleaning liquid is injected into the reagent tank 21, the dosing pump 22 can input the cleaning liquid in the reagent tank 21 into the rectifier 7 through the dosing pump 22, and then the dosing pump 22 is turned off; then the cleaning pump 25 is started, so that the cleaning pump 25 will allow the cleaning agent entering the rectifier 7 to circulate continuously in the circulation circuit formed by the pH detector 10, the corrosion rate detector 11, the cooler 12, the dissolved oxygen detector 13, the suspended matter detector 14, the buffer tank 15 and the circulation pipeline 24 connected in series at one end of the oil measuring module 8 and the detection branch pipe 9, so as to achieve the purpose of cleaning each detection instrument.

[0045] The purpose of setting the water separator 26 is to enable the gas discharged from the reagent tank 21, the rectifier 7 and the buffer tank 15 to enter the water separator 26 during operation, and the water separator 26 separates the gas entering therein into gas and liquid, and the separated liquid is finally discharged to the outside through the drainage pipe 27.

[0046] The sulfide detection module 43 includes a multi-way valve A30, a detection cell A31, a sulfide detector 32, a washing pump 33 and an analysis pump 34. The multi-way valve A30 is connected to the washing pump 33, the analysis pump 34 and a plurality of liquid preparation bottles 35 through pipelines. The multi-way valve A30 is connected to the detection cell A31 through pipelines, and the sulfide detector 32 is installed on the detection cell A31.

[0047] The total iron detection module 42 includes a multi-way valve B36, a detection pool B37, a total iron detector 38, a washing pump 33 and an analysis pump 34. The multi-way valve B36 is connected to the washing pump 33, the analysis pump 34 and a plurality of liquid preparation bottles 35 through a pipeline. The multi-way valve B36 is connected to the detection pool B37 through a pipeline, and the total iron detector 38 is installed on the detection pool B37.

[0048] The cleaning module 57 includes a cleaning tank 39, a waste liquid tank 40 and an inspection liquid tank 41, which are connected to a multi-way valve A30 and a multi-way valve B36 respectively through pipelines, and the waste liquid tank 40 is connected to a drainage pipe 27 through pipelines and valves.

[0049] The oil measuring module 8 includes an infrared photoelectric detector 44, a transparent glass tube 45, an assembly sleeve 46, a mounting seat 47, a sliding rod 48, a cleaning brush head 49, a magnetic ring 50 and a magnetic block 51. The assembly sleeve 46 is installed at the bottom of the mounting seat 47, the transparent glass tube 45 is installed on the inner side of the assembly sleeve 46, the infrared photoelectric detector 44 is installed on the outer side of the transparent glass tube 45, the mounting seat 47 is located above the transparent glass tube 45, the sliding rod 48 is slidably connected to the mounting seat 47, the top of the sliding rod 48 is fixedly connected to the magnetic block 51, and the mounting seat 47 is located on the outside of the magnetic block 51, a sliding chamber 52 is arranged on the mounting seat 47, a magnetic ring 50 is installed on the inner side of the sliding chamber 52 through a pushing cylinder 53, the sliding chamber 52 is located below the magnetic ring 50, a return spring 54 is installed on the inner side of the sliding chamber 52, the lower end of the sliding rod 48 extends to the assembly sleeve 46 where a cleaning brush head 49 is installed, the cleaning brush head 49 is intermittently inserted and connected with the transparent glass tube 45, a sample inlet is arranged at the bottom end of the assembly sleeve 46, and a sample outlet is arranged on the assembly sleeve 46 on one side above the transparent glass tube 45.

[0050] An intelligent controller 92 is fixedly connected to the mobile platform 1, and the oil measuring module 8, the total iron detection module 42, the sulfide detection module 43, the water quality detection module 55, the water quality treatment module 56, the cleaning module 57 and the sampling module 58 are all electrically connected to the intelligent controller 92. By setting the intelligent controller 92, the oil measuring module 8, the total iron detection module 42, the sulfide detection module 43, the water quality detection module 55, the water quality treatment module 56, the cleaning module 57 and the sampling module 58 can be controlled to be driven at a fixed time.

[0051] The method for detecting suspended matter, dissolved oxygen, corrosion rate and pH in seawater quality is usually to use suspended matter detector 14, dissolved oxygen detector 13, corrosion rate detector 11 and pH detector 10 for detection. For polluted water quality, pH detector 10 is usually required to obtain at least one monitoring data every ten minutes. This is to ensure that the pH value changes of water quality can be tracked in real time, and possible water quality problems can be discovered and dealt with in time. The corrosion rate detector 11 is usually required to obtain at least one monitoring data every thirty minutes. This is because this detection frequency can ensure the accuracy and timeliness of the corrosion rate data. The dissolved oxygen detector 13 is usually required to obtain at least one monitoring data every sixty minutes. This is because this frequency can usually meet conventional monitoring needs and reflect the changing trend of dissolved oxygen in seawater to a certain extent. The suspended matter detector 14 is usually required to obtain at least one monitoring data every minute. This is because the changes in suspended matter concentration may be relatively rapid, and a fast-response instrument is required to accurately capture these changes.

[0052] The pH detector 10 usually detects water quality at seventy degrees, because pH measurement has high requirements on the high temperature resistance of the electrode. Although seventy degrees is relatively low, the accuracy of the measurement can be ensured. The corrosion rate detector 11 is used in a water injection system at around seventy degrees. Monitoring the corrosion rate is crucial for evaluating equipment life, preventing leakage and ensuring water quality safety. The dissolved oxygen detector 13 usually detects water quality in a low temperature range below sixty degrees. The change of dissolved oxygen is relatively stable and more suitable for precise measurement. The suspended matter detector 14 is used in a water injection system below thirty degrees. The sedimentation rate of suspended matter may be slow, which is conducive to the accurate capture and measurement of the detection instrument to ensure that the water quality meets the standards.

[0053] The purpose of setting the magnetic ring 50 and the cleaning brush head 49 in this way is that when the compressed gas enters the pushing cylinder 53, the upper part of the magnetic ring 50 is pressed and forced to move downward, and the magnetic block 51 will drive the cleaning brush head 49 to enter through the sliding rod 48 under the action of the magnetic force of the magnetic ring 50 and clean the transparent glass tube 45 downward through the cleaning brush head 49; when the gas in the pushing cylinder 53 is emptied, the pushing cylinder 53 quickly decompresses the pressure, causing the upper part of the magnetic ring 50 to lose pressure, and the magnetic ring 50 is reset under the elastic force of the reset spring 54; in the process of the magnetic ring 50 moving up and resetting, the magnetic block 51 will drive the cleaning brush head 49 to enter through the sliding rod 48 under the action of the magnetic force of the magnetic ring 50 and clean the transparent glass tube 45 upward through the cleaning brush head 49, so that the cleaning brush head 49 repeatedly moves up and down to complete the cleaning process of the transparent glass tube 45.

[0054] After the transparent glass tube 45 is cleaned, the water quality detection accuracy can be further improved, thereby avoiding the occurrence of dirt adhering to the transparent glass tube 45 and affecting the detection accuracy. When the oil measuring module 8 is measuring, the cleaning brush head 49 is located above the transparent glass tube 45, and the water sample to be tested will enter the interior of the transparent glass tube 45 through the sampling port, and finally be discharged through the sampling port. During this process, the infrared photoelectric detector 44 completes the detection of the oil content in the water.

[0055] A floating ball is fixedly connected to the drain board 88, and sliding blocks are fixedly connected to the outer sides of the four drain boards 88. Sliding grooves are provided on the inner sides of the pH detector 10, the corrosion rate detector 11, the dissolved oxygen detector 13 and the suspended matter detector 14. The four sliding blocks are slidably connected to the four sliding grooves respectively. The floating ball can make the drain board 88 have a buoyancy effect. By setting the sliding blocks and the sliding grooves, the drain board 88 can be limited so that the drain board 88 can move vertically up and down.

[0056] The implementation principle of a mobile online monitoring device for water quality of offshore oil field injection water in the embodiment of the present application is as follows: (1) Under the operation of the water pump 2, the injection water quality is input into the detection pipeline A3 and the detection pipeline B4, and then enters the inner side of the detection pipeline B4, the clean water branch pipe 28 and the detection branch pipe 9. First, the oil content in the water is detected by the oil detection module 8, and then it merges with the injection water quality in the detection branch pipe 9. The injection water quality can be heated by the hot water pump 29, and the temperature of the injection water quality can be detected by the temperature detector 63. When the injection water quality is heated to about 70 degrees, the movable baffle 62 can be driven up and down by the electric push rod 61, and the detection branch pipe can be heated. 9 is discharged, and the heated water quality will be detected by the PH detector 10 and the corrosion rate detector 11. At the same time, when the injection water quality passes through the cooler 12, the water quality can be cooled down. Another temperature detector 63 can detect the cooling temperature of the injection water quality. When the injection water quality is heated to below 30 degrees, the electric push rod 61 can drive the movable baffle 62 to move up and down, and the cooled water quality inside the detection branch pipe 9 can be discharged. The cooled water quality will be detected by the dissolved oxygen detector 13 and the suspended matter detector 14; (2) The threaded rod 69 can be driven to rotate by the motor 68. Since the threaded rod 69 is threadedly connected to the water control plate 70, when the threaded rod 69 rotates, the water control plate 70 will be driven to translate on the inner side of the power tube 59. The distance between the water control plate 70 and the power tube 59 can be controlled to control the flow rate of the liquid, thereby creating a gap on the inner side of the power tube 59. The liquid on the inner side of the detection branch pipe 9 will flow through the gap to the top of the water control plate 70. The gradual addition of liquid will gradually increase the weight on the top of the water control plate 70, thereby driving the power plate 71 and the movable rack 73 to move downward in turn, so that the two compression springs 72 are in a compressed state. Because the movable rack 73 The movable rack 73 is meshed with the movable gear 74, so when the movable rack 73 moves downward, it will drive the movable gear 74, the rotating shaft 75, the first power sheet 76, the second power sheet 77, the third power sheet 78 and the fourth power sheet 79 to rotate in sequence. When the first power sheet 76, the second power sheet 77, the third power sheet 78 and the fourth power sheet 79 rotate, they will push the four movable cone blocks 65 respectively, so that the four spiral springs 66 are in a compressed state respectively, and then the four water inlet plates 64 can be driven to move respectively, so that the pH detector 10, the corrosion rate detector 11, the dissolved oxygen detector 13 and the suspended matter detector 14 can be opened, so that hot water of about 70 degrees enters the pH detector 10, the corrosion rate detector 11, the dissolved oxygen detector 13 and the suspended matter detector 14 respectively. The inner side of the H detector 10 and the corrosion rate detector 11 allows cold water below 30 degrees to enter the inner side of the dissolved oxygen detector 13 and the suspended matter detector 14 respectively, and then the pH, corrosion rate, dissolved oxygen and suspended matter of the water quality can be detected respectively through the pH detector 10, the corrosion rate detector 11, the dissolved oxygen detector 13 and the suspended matter detector 14. The water quality after detection will flow into the buffer tank 15, so that the process can complete the oil content detection, pH detection, corrosion rate detection, dissolved oxygen detection and suspended matter detection in the water. Through the rotation of five first power plates 76, two second power plates 77, the third power plate 78 and eight fourth power plates 79, it can The opening time and frequency of the four water inlet plates 64 are controlled respectively. Through the number of the first power sheet 76, the second power sheet 77, the third power sheet 78 and the fourth power sheet 79, the pH detector 10 can be controlled to obtain at least one monitoring data every ten minutes, the corrosion rate detector 11 can obtain at least one monitoring data every thirty minutes, the dissolved oxygen detector 13 can obtain at least one monitoring data every sixty minutes, and the suspended matter detector 14 can obtain at least one monitoring data every minute. The data detected by the pH detector 10, the corrosion rate detector 11, the dissolved oxygen detector 13 and the suspended matter detector 14 can be recorded through the intelligent controller 92 to ensure the effect of seawater quality detection; (3) Therefore, through this method, the time frequency of the pH detector 10, the corrosion rate detector 11, the dissolved oxygen detector 13 and the suspended matter detector 14 for seawater detection can be controlled according to the degree of seawater pollution. At the same time, the frequency of the five first power sheets 76, the two second power sheets 77, the one third power sheet 78 and the eight fourth power sheets 79 driving the pH detector 10, the corrosion rate detector 11, the dissolved oxygen detector 13 and the suspended matter detector 14 respectively will also be relatively accelerated, which will not affect the time frequency of the five first power sheets 76, the two second power sheets 77, the one third power sheet 78 and the eight fourth power sheets 79 driving the pH detector 10, the corrosion rate detector 11, the dissolved oxygen detector 13 and the suspended matter detector 14 respectively; (4) When the liquid enters the inner side of the pH detector 10, the corrosion rate detector 11, the dissolved oxygen detector 13 and the suspended solids detector 14, the liquid first contacts the drain plate 88, and the drain plate 88 can move upward by the buoyancy. The drain plate 88 can be limited by the sliding block and the sliding groove, so that the drain plate 88 can move vertically upward. At the same time, when the drain plate 88 moves upward, the air spring 89 is in a squeezed state, so that the limiting arc block 90 enters the inner side of the drain plate 88, so that the drain plate 88 can move upward vertically. The water plate 88 loses its limit, and the cooperation between the multiple arc grooves, the air spring 89, the telescopic rod 91 and the limit arc block 90 can make the drain plate 88 move slowly upward or downward. When the drain plate 88 moves upward or downward, the water inlet of the water supply pipe 60 can be opened or closed, so that the liquid inside the pH detector 10, the corrosion rate detector 11, the dissolved oxygen detector 13 and the suspended matter detector 14 can flow into the inside of the water supply pipe 60, and then the liquid will flow into the inside of the buffer tank 15; (5) This method can slowly move the drain plate 88 upward or downward, which can ensure that the liquid inside the pH detector 10, the corrosion rate detector 11, the dissolved oxygen detector 13 and the suspended matter detector 14 is completely discharged. At the same time, the liquid can stay inside the pH detector 10, the corrosion rate detector 11, the dissolved oxygen detector 13 and the suspended matter detector 14 for a period of time, ensuring the effectiveness of the pH detector 10, the corrosion rate detector 11, the dissolved oxygen detector 13 and the suspended matter detector 14 in detecting the pH, corrosion rate, dissolved oxygen and suspended matter of the water quality; (6) When the power plate 71 moves to the limiting cone block 87 due to the gravity of the liquid, the annular spring 86 is in a compressed state, which can then drive the limiting cone block 87 and the movable pin 84 to move in turn, so that the power plate 71 can be smoothly moved to the bottom of the limiting cone block 87, so that the power plate 71 fits with the top of the limiting cone block 87. At this time, the power plate 71 will be flush with the water inlet cavity, so that the liquid above the power plate 71 will flow into the inner side of the water inlet cavity, and the liquid will be flushed to the top of the multiple waterwheel pieces 81, and then the multiple waterwheel pieces 81, the connecting shaft 80 and the take-up wheel 82 can be driven to rotate in turn through the flushing of the liquid. When the take-up wheel 82 rotates, it can The pull wire 85 is wound up, which causes the annular spring 86 to be in a compressed state, and can then drive the limiting cone block 87 and the movable pin 84 to move slowly in sequence, so that the liquid on the power plate 71 completely flows into the water inlet cavity and then flows into the inner side of the water delivery pipe 60, so as to achieve the purpose of completely draining the power tube 59. When the movable pull wire 85 is wound up to completely separate the limiting cone block 87 from the power plate 71, the elastic force of the two compression springs 72 can bounce the power plate 71 back to its original position, so that the pH detector 10, the corrosion rate detector 11, the dissolved oxygen detector 13 and the suspended matter detector 14 can frequently detect the liquid again. (7) The injection water quality entering the detection pipeline A3 will flow into the sampling cup 5. After the injection water quality enters the sampling cup 5, the sulfide detection module 43 transports the injection water quality and the prepared liquid in each preparation bottle 35 to the detection pool A31 through the analysis pump 34 and the multi-way valve A30, and completes the sulfide detection through the sulfide detector 32. At the same time, the total iron detection module 42 transports the injection water quality and the prepared liquid in each preparation bottle 35 to the detection pool B37 through the analysis pump 34 and the multi-way valve A30, and completes the total iron content detection through the total iron detector 38. At this point, the multi-parameter online monitoring device can fully complete the oil content detection, pH detection, corrosion rate detection, dissolved oxygen detection, suspended matter detection, sulfide detection and total iron content detection in water; (8) After the above detection is completed, the washing pump 33 in the sulfide detection module 43 and the total iron detection module 42 draws washing water from the washing tank 39 to clean the multi-way valve A30 and the multi-way valve B36 and the corresponding detection tank A31 and the detection tank B37, and finally enters the waste liquid tank 40, so that the cleaning of the sulfide detection module 43 and the total iron detection module 42 can be completed. After the cleaning is completed, the sulfide detection module 43 and the total iron detection module 42 can enter the next detection work, and the waste liquid entering the waste liquid tank 40 is finally discharged through the drain pipe 6; (9) At the same time, after the cleaning liquid is injected into the reagent tank 21, the dosing pump 22 can input the cleaning liquid in the reagent tank 21 into the rectifier 7 through the dosing pump 22, and then the dosing pump 22 is turned off; then the cleaning pump 25 is started, so that the cleaning pump 25 will continuously circulate the cleaning agent entering the rectifier 7 in the circulation circuit formed by the pH detector 10, the corrosion rate detector 11, the cooler 12, the dissolved oxygen detector 13, the suspended matter detector 14, the buffer tank 15 and the circulation pipeline 24 connected in series between the oil measuring module 8 and one end of the detection branch pipe 9 to achieve the purpose of cleaning each detection instrument. After the circulation cleaning is completed, the clean water is heated by the hot water pump 29 and then input into each detection instrument through the clean water branch pipe 28 for re-cleaning. The cleaning water is finally discharged through the waste pipe 16 and the waste pump 17. At this point, the multi-parameter online monitoring device has completed the cleaning work and can enter the next working cycle; (10) Therefore, through the above principle, the five first power sheets 76 can control the pH detector 10 to obtain a monitoring data every ten minutes, the two second power sheets 77 can control the corrosion rate detector 11 to obtain a monitoring data every thirty minutes, the one third power sheet 78 can control the dissolved oxygen detector 13 to obtain a monitoring data every sixty minutes, and the eight fourth power sheets 79 can control the suspended matter detector 14 to obtain a monitoring data every minute. At the same time, when the rotating shaft 75 controls the eight fourth power sheets 79 to sample the suspended matter detector 14, the five first power sheets 76, the two second power sheets 77 and the one third power sheet 78 will also swing to have an energy storage effect, and also swing to control the time, so as to accurately control the five first power sheets 76 to the pH detector 10. , the time for the two second power sheets 77 to accurately sample the corrosion rate detector 11 and the time for the third power sheet 78 to accurately sample the corrosion rate detector 11, and there is no need to separately calculate the time for the pH detector 10, the corrosion rate detector 11 and the dissolved oxygen detector 13. When the eight fourth power sheets 79 sample the suspended matter detector 14 every minute, the five first power sheets 76, the two second power sheets 77 and the third power sheet 78 are also rotating, and the sampling time of the pH detector 10, the corrosion rate detector 11 and the dissolved oxygen detector 13 is used for energy storage preparation, and the sampling time is also accurately controlled to ensure that the pH detector 10, the corrosion rate detector 11, the dissolved oxygen detector 13 and the suspended matter detector 14 respectively accurately sample the water quality at accurate time; (11) At the same time, by the number of the first power sheet 76, the second power sheet 77, the third power sheet 78 and the fourth power sheet 79, at the same time, in different polluted sea areas, the frequency of the seawater detection time of the pH detector 10, the corrosion rate detector 11, the dissolved oxygen detector 13 and the suspended matter detector 14 may be different, but the number of the first power sheet 76, the second power sheet 77, the third power sheet 78 and the fourth power sheet 79 can be set respectively to control the sampling time of the pH detector 10, the corrosion rate detector 11, the dissolved oxygen detector 13 and the suspended matter detector 14 respectively, and the time of the seawater detection of the pH detector 10, the corrosion rate detector 11, the dissolved oxygen detector 13 and the suspended matter detector 14 can be controlled according to the number and rotation speed of the first power sheet 76, the second power sheet 77, the third power sheet 78 and the fourth power sheet 79; (12) The five first power sheets 76, the two second power sheets 77, the one third power sheet 78 and the eight fourth power sheets 79 are all controlled by the lifting member driving the rotating shaft 75. Therefore, the rotation of the first power sheet 76, the second power sheet 77, the third power sheet 78 and the fourth power sheet 79 is driven by the lifting member. The timing of the pH detector 10, the corrosion rate detector 11, the dissolved oxygen detector 13 and the suspended matter detector 14 does not need to be driven by other additional power sources. There is no need to set up multiple additional power sources to respectively realize the timed sampling of the pH detector 10, the corrosion rate detector 11, the dissolved oxygen detector 13 and the suspended matter detector 14, which reduces energy waste and avoids the influence of multiple intelligent power sources on the pH detector 10, the corrosion rate detector 11, the dissolved oxygen detector 13 and the suspended matter detector 14, so as to ensure the effect of the timed sampling of the pH detector 10, the corrosion rate detector 11, the dissolved oxygen detector 13 and the suspended matter detector 14. (13) Through this method, the control component can control the distance between the water control plate 70 and the power tube 59, control the flow rate of the liquid in the power tube 59, and control the driving time of the lifting member according to the degree of seawater pollution, because the lifting member is controlled by the weight of the liquid placed between the water control plate 70 and the power tube 59, and the lifting member does not have an additional power source, and can be driven by the continuous superposition of liquid, which can further save energy consumption. The distance between the water control plate 70 and the power tube 59 can be controlled and adjusted according to the time frequency required for detection by the pH detector 10, the corrosion rate detector 11, the dissolved oxygen detector 13 and the suspended matter detector 14; (14) The detection time of the pH detector 10, the corrosion rate detector 11, the dissolved oxygen detector 13 and the suspended matter detector 14 can be controlled by the rotation speed of the five first power sheets 76, the two second power sheets 77, the one third power sheet 78 and the eight fourth power sheets 79. The detection time and frequency of the pH detector 10, the corrosion rate detector 11, the dissolved oxygen detector 13 and the suspended matter detector 14 for seawater can also be controlled. (15) When using seriously polluted seawater, the pH detector 10, the corrosion rate detector 11, the dissolved oxygen detector 13 and the suspended matter detector 14 need to detect more frequently, so that the control component can drive the water control plate 70, expand the gap between the water control plate 70 and the power tube 59, increase the flow rate of the liquid, and speed up the time for the lifting member to drive the five first power plates 76, the two second power plates 77, the one third power plate 78 and the eight fourth power plates 79 to rotate, thereby speeding up the time frequency of the pH detector 10, the corrosion rate detector 11, the dissolved oxygen detector 13 and the suspended matter detector 14 to detect seawater; (16) When using seawater that is not seriously polluted, the pH detector 10, the corrosion rate detector 11, the dissolved oxygen detector 13 and the suspended matter detector 14 do not need to be tested too frequently, so that the control component can drive the water control plate 70, reduce the gap between the water control plate 70 and the power tube 59, reduce the flow of liquid, and slow down the time for the lifting component to drive the five first power plates 76, the two second power plates 77, the one third power plate 78 and the eight fourth power plates 79 to rotate, thereby slowing down the frequency of the pH detector 10, the corrosion rate detector 11, the dissolved oxygen detector 13 and the suspended matter detector 14 to detect seawater.

[0057] Compared with the prior art, the overall structure is simple and easy to use. Each detector can detect the water quality in the best detection cycle. Each detector can detect the water quality at the same time. The accuracy and timeliness of each data can be ensured in different detection cycles according to the characteristics of each parameter, avoiding the interference of each detector detecting the water quality at the same time, and ensuring the effect of seawater quality detection. It integrates online monitoring, data processing, data transmission, fault diagnosis, automatic cleaning, and over-limit warning. It has a compact structure and ingenious design. It can meet the needs of multiple parameter performance detection such as oil, suspended matter, dissolved oxygen, corrosion rate, total iron, sulfide, pH, etc. in water, so as to solve the problem that the existing manual detection of water quality for offshore platform injection water needs to be sampled, packaged and returned to land, and multiple detection equipment is used for manual detection. The multi-parameter on-site intelligent online monitoring device for offshore platform water quality solves the problem that the existing offshore platform water quality detection method requires multiple detection equipment for detection, and is particularly suitable for the needs of offshore platform water quality detection, so as to replace the high cost and timeliness of manual detection.

[0058] The above are all preferred embodiments of the present application, and the protection scope of the present application is not limited thereto. Therefore, any equivalent changes made according to the structure, shape, and principle of the present application should be included in the protection scope of the present application.

Claims

1. A mobile online monitoring device for water quality of offshore oil field injection, characterized by: It comprises a mobile platform (1), an oil measuring module (8) arranged on the mobile platform (1), a total iron detection module (42), a sulfide detection module (43), a water quality detection module (55), a water quality treatment module (56), a cleaning module (57) and a sampling module (58), and a detection branch pipe (9) arranged on the oil measuring module (8); The water quality detection module (55) comprises a pH detector (10), a corrosion rate detector (11), a dissolved oxygen detector (13), a suspended matter detector (14) and a buffer tank (15) which are arranged on the mobile platform (1); the oil measurement module (8), the pH detector (10), the corrosion rate detector (11), the dissolved oxygen detector (13), the suspended matter detector (14) and the buffer tank (15) are all connected to a detection branch pipe (9); and two water control components are arranged on the detection branch pipe (9); A power pipe (59) and a water supply pipe (60) are arranged outside the detection branch pipe (9); the power pipe (59), the pH detector (10), the corrosion rate detector (11), the dissolved oxygen detector (13) and the suspended matter detector (14) are all connected to the water supply pipe (60); and the pH detector (10), the corrosion rate detector (11), the dissolved oxygen detector (13) and the suspended matter detector (14) are all provided with a water inlet component and a water outlet component for automatically inletting and draining water; The water inlet assembly comprises water inlet plates (64) movably arranged on the pH detector (10), the corrosion rate detector (11), the dissolved oxygen detector (13) and the suspended matter detector (14), and four water inlet parts respectively used to translate the four water inlet plates (64), and the power pipe (59) is provided with a driving part for driving the four water inlet parts; The drainage assembly comprises a drainage plate (88) movably arranged on the pH detector (10), the corrosion rate detector (11), the dissolved oxygen detector (13) and the suspended matter detector (14), and four limiting members respectively used to limit the positions of the four drainage plates (88), and the four drainage plates (88) are all movably fitted with the water supply pipe (60); The power tube (59) is provided with a control component for controlling the amount of liquid input and a power component for timing driving the driving member, the power component comprising a power plate (71) movably arranged inside the power tube (59) and a lifting member for lifting the power plate (71), the power tube (59) is provided with a positioning member for positioning the power plate (71), and the water supply pipe (60) is provided with a power member for automatically driving the positioning member.

2. The mobile online monitoring device for water quality of offshore oilfield injection water according to claim 1 is characterized by: The control assembly comprises a water control plate (70) movably arranged on the power tube (59), a threaded rod (69) rotatably arranged on the power tube (59), a fixing frame (67) fixed on the power tube (59), and a motor (68) fixed on the fixing frame (67); the threaded rod (69) is fixedly connected to an output end of the motor (68); the water control plate (70) is threadedly connected to the threaded rod (69); a connecting square hole is opened on the inner side of the power tube (59); and the water control plate (70) is slidably connected to the connecting square hole.

3. The mobile online monitoring device for water quality of offshore oil field injection water according to claim 1 is characterized by: The lifting member comprises a rotating shaft (75) rotatably arranged on the detection branch pipe (9), a movable gear (74) fixed on the rotating shaft (75), a first power plate (76), a second power plate (77), a third power plate (78) and a fourth power plate (79), two compression springs (72) fixed at the bottom of the power plate (71), and a movable rack (73) movably arranged in the power tube (59), the movable gear (74) movably meshing with the movable rack (73), the movable rack (73) being fixedly connected to the power plate (71), the power tube (59) being rotatably connected to the rotating shaft (75), and the two compression springs (72) being both engaged with the movable rack (73). The power tube (59) is fixedly connected, the number of the first power sheets (76) is five, and the five first power sheets (76) are all movably fitted with the movable cone block (65) on the pH detector (10), the number of the second power sheets (77) is two, and the two second power sheets (77) are all movably fitted with the movable cone block (65) on the corrosion rate detector (11), the third power sheet (78) is movably fitted with the movable cone block (65) on the dissolved oxygen detector (13), and the number of the fourth power sheets (79) is eight, and the eight fourth power sheets (79) are all movably fitted with the movable cone block (65) on the suspended matter detector (14).

4. The mobile on-line monitoring device for water quality of offshore oilfield water injection according to claim 1 is characterized by: The water inlet component comprises a movable cone block (65) fixed on the water inlet plate (64) and a coil spring (66) fixed on the movable cone block (65). The movable cone block (65) and the coil spring (66) are each four in number. The four coil springs (66) are respectively fixedly connected to the pH detector (10), the corrosion rate detector (11), the dissolved oxygen detector (13) and the suspended matter detector (14). The inner sides of the four pH detectors (10), the corrosion rate detector (11), the dissolved oxygen detector (13) and the suspended matter detector (14) are each provided with a fixed square hole. The four water inlet plates (64) are respectively slidably connected to the four fixed square holes.

5. The mobile online monitoring device for water quality of offshore oil field injection water according to claim 1 is characterized by: The water control component comprises a movable baffle (62) movably arranged on the detection branch pipe (9) and an electric push rod (61) fixed on the detection branch pipe (9). The movable baffle (62) and the electric push rod (61) are both provided in two numbers. The two electric push rods (61) are respectively fixedly connected to the two movable baffles (62). The detection branch pipe (9) is provided with two fixed through holes. The two movable baffles (62) are respectively slidably connected to the two fixed through holes. The detection branch pipe (9) is provided with two temperature detectors (63). A cooler (12) is provided on the outer side of the detection branch pipe (9). A hot water pump (29) is provided on the outer side of the detection branch pipe (9).

6. The mobile online monitoring device for water quality of offshore oil field injection water according to claim 1 is characterized by: The power member comprises a connecting shaft (80) rotatably arranged on the power tube (59), five waterwheel plates (81) and a line-receiving wheel (82) fixed on the connecting shaft (80), a limiting wheel (83) fixed on the power tube (59), a movable pin (84) movably arranged on the power tube (59), an annular spring (86) fixed on the movable pin (84), a limiting cone block (87) and a movable pull wire (85); the movable pull wire (85) is wound around the outside of the line-receiving wheel (82); the movable pull wire (85) is movably connected to the limiting wheel (83); the annular spring (86) is fixedly connected to the power tube (59); the limiting cone block (87) is movably fitted to the power plate (71); the five waterwheel plates (81) are evenly distributed on the outside of the connecting shaft (80); a water inlet cavity is opened on the inside of the power tube (59); and the waterwheel plates (81) are located on the inside of the water inlet cavity.

7. The mobile on-line monitoring device for water quality of offshore oilfield injection water according to claim 1 is characterized by: The limiting member comprises an air spring (89) and a telescopic rod (91) fixed on a drainage plate (88), and a limiting arc block (90) fixed on the air spring (89); the limiting arc block (90) is fixedly connected to the telescopic rod (91); the number of the drainage plate (88), the air spring (89), the limiting arc block (90) and the telescopic rod (91) is four; the inner sides of the pH detector (10), the corrosion rate detector (11), the dissolved oxygen detector (13) and the suspended matter detector (14) are all provided with arc grooves arranged at equal distances; the limiting arc block (90) is engaged with the arc grooves.

8. The mobile on-line monitoring device for water quality of offshore oilfield water injection according to claim 1 is characterized by: The sampling module (58) comprises a water pump (2), the water pump (2) being connected to a water delivery pipeline, a detection pipeline A (3) and a detection pipeline B (4) being connected in parallel on one side of the water pump (2), a sampling cup (5) being connected to the outside of the detection pipeline A (3), the total iron detection module (42) and the sulfide detection module (43) being connected to the sampling cup (5), an output end of the sampling cup (5) being connected to a liquid discharge pipe (6) via a pipeline and a valve, a rectifier (7) being connected to the outside of the detection pipeline B (4), and the detection pipeline B (4) being connected in parallel to an oil measurement module (8) and a detection branch pipe (9) via the rectifier (7).

9. The mobile on-line monitoring device for water quality of offshore oilfield injection water according to claim 8, characterized in that: The water quality treatment module (56) comprises a reagent tank (21), a dosing pump (22) and a water distributor (26); the reagent tank (21) is connected in parallel with a cleaning pipeline (23) and a circulation pipeline (24) via the dosing pump (22) and a valve; the cleaning pipeline (23) is connected to a detection pipeline B (4); the outer side of the circulation pipeline (24) is connected to a cleaning pump (25); the circulation pipeline (24) is connected to the bottom end of a buffer tank (15) via the cleaning pump (25); the water distributor (26) is connected to the reagent tank (21), a rectifier (7) and a buffer tank (15) via pipelines; the output end of the water distributor (26) is connected to a drainage ground pipe (27).

10. The mobile on-line monitoring device for water quality of offshore oilfield injection water according to claim 1, characterized in that: The sulfide detection module (43) comprises a multi-way valve A (30), a detection pool A (31), a sulfide detector (32), a washing pump (33) and an analysis pump (34); the multi-way valve A (30) is connected to the washing pump (33), the analysis pump (34) and a plurality of liquid preparation bottles (35) via pipelines; the multi-way valve A (30) is connected to the detection pool A (31) via pipelines; and the sulfide detector (32) is installed on the detection pool A (31); The total iron detection module (42) comprises a multi-way valve B (36), a detection pool B (37), a total iron detector (38), a washing pump (33) and an analysis pump (34); the multi-way valve B (36) is connected to the washing pump (33), the analysis pump (34) and a plurality of liquid preparation bottles (35) via pipelines; the multi-way valve B (36) is connected to the detection pool B (37) via pipelines; and the total iron detector (38) is installed on the detection pool B (37).

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