Online detection system for water quality of oilfield produced water

Abstract

The utility model discloses an oil field produced water quality on-line detection system which comprises a detection cabinet, a control assembly and an analysis structure, the control assembly and the analysis structure are arranged in the detection cabinet, and the analysis structure is electrically connected with the control assembly; the analysis structure comprises an analysis pipeline and an analysis assembly, the analysis assembly comprises a cleaning device, a PH detection device, a water quality detection device and a water flow control device, the analysis pipeline comprises a water inlet pipe, a water supply pipe, a water outlet pipe and a water return pipe, and the water inlet pipe and the water outlet pipe are connected to the front end and the rear end of the water supply pipe respectively to form a passage; the two ends of the water return pipe are connected with the front end and the rear end of the water supply pipe respectively to form a channel, and the cleaning device, the PH detection device, the water quality detection device and the water flow control device are sequentially arranged on the water supply pipe from front to back. The water quality monitoring device has the advantages of real-time detection, low cost and complete data recording, so that operation and maintenance personnel can intuitively know the water quality of produced water.

Description

Technical Field

[0001] This utility model relates to the field of water quality monitoring technology, specifically to an online monitoring system for produced water quality in oil fields. Background Technology

[0002] Oilfields often employ water injection to enhance oil recovery, resulting in produced water. Monitoring this produced water is crucial during the extraction process. Produced water requires testing for oil, suspended solids, and pH at various treatment stages. Currently, this is typically done by sending samples for testing, which is time-consuming, expensive, and lacks timeliness. Furthermore, due to the high oil content, corrosiveness, and complex liquid properties of produced water, conventional online instruments are unusable, making online monitoring difficult. While several online monitoring systems exist, such as the one used in CN217359851U, these systems suffer from issues like lack of automatic cleaning, high maintenance workload, and low system integration, leading to a poor user experience. This invention provides an online produced water quality monitoring system to address these problems. Utility Model Content

[0003] This invention provides an online detection system for oilfield produced water quality, which has the functions of efficient cleaning and automatic flow control, effectively improving the accuracy and automation of the detection system.

[0004] The technical solution adopted by this utility model to solve the above-mentioned technical problems is:

[0005] An online monitoring system for oilfield produced water quality includes a monitoring cabinet, a control component, and an analysis structure. The control component and the analysis structure are housed in the monitoring cabinet, and the analysis structure is electrically connected to the control component.

[0006] The analytical structure includes analytical pipelines and analytical components. The analytical components include a cleaning device, a pH detection device, a water quality detection device, and a water flow control device. The analytical pipeline includes an inlet pipe, a delivery pipe, an outlet pipe, and a return pipe. The inlet pipe and the outlet pipe are respectively connected to the front and rear ends of the delivery pipe to form a passage. The two ends of the return pipe are respectively connected to the front and rear ends of the delivery pipe to form a loop. The cleaning device, pH detection device, water quality detection device, and water flow control device are arranged sequentially on the delivery pipe from front to back.

[0007] Furthermore, the water flow control device includes a booster pump, a water flow switch, and a switch controller. The booster pump and the water flow switch are arranged sequentially from front to back on the water delivery pipe. The switch controller is located in the water delivery pipe and is electrically connected to the water flow switch. The water flow switch is electrically connected to the booster pump.

[0008] Furthermore, the switch controller includes a first temperature sensor and a second temperature sensor, the first temperature sensor being disposed on the front side of the flow switch and the second temperature sensor being disposed on the rear side of the flow switch.

[0009] Furthermore, the water quality testing device includes a first flow tank and a first sensor. The first sensor is installed in the first flow tank. The first flow tank is provided with an inlet, an outlet and a drain outlet. The inlet and outlet of the first flow tank are both connected to a water supply pipe.

[0010] Furthermore, the pH detection device includes a second flow cell and a second sensor, the second sensor being disposed in the second flow cell.

[0011] Furthermore, the cleaning device includes a cleaning pump and a cleaning solution bottle, the cleaning solution bottle being connected to the cleaning pump, and the cleaning pump being connected to a water supply pipe.

[0012] Furthermore, the control component includes an analysis controller, a data acquisition module, a communication module, a circuit controller, a server, and a display. The analysis structure and the analysis controller are electrically connected. The analysis controller is electrically connected to the data acquisition module. The data acquisition module is connected to the server through the communication module. The display is connected to the server. The circuit controller is electrically connected to the water flow control device and the cleaning device.

[0013] Furthermore, the inlet pipe, delivery pipe, outlet pipe, and return pipe are transparent PVC pipes.

[0014] Furthermore, valves are installed on the inlet pipe, outlet pipe, and return pipe.

[0015] The beneficial effects of this utility model are as follows:

[0016] The system is equipped with a circuit and a cleaning device to clean the detection system, keeping it clean and thus ensuring the detection accuracy of the entire system.

[0017] The control components are set up to enable automatic data acquisition and uploading, ensuring the automatic and continuous operation of the detection system. It has the advantages of real-time detection, low cost and complete data recording, while also ensuring the security of the detection data, allowing maintenance personnel to intuitively understand the water quality of the extracted water. Attached Figure Description

[0018] Figure 1 This is a schematic diagram of the overall structure of this utility model;

[0019] Figure 2 This is a schematic diagram of the water flow path in the real-time detection mode of this utility model;

[0020] Figure 3This is a schematic diagram of the water flow path in the cleaning mode of this utility model.

[0021] Reference numerals: 1. Testing cabinet; 2. Control components; 3. Analysis structure; 31. Cleaning device; 32. pH testing device; 33. Water quality testing device; 34. Water flow control device; 341. Booster pump; 342. Water flow switch; 35. Inlet pipe; 36. Supply pipe; 37. Outlet pipe; 38. Return pipe. Detailed Implementation

[0022] The technical solutions of the embodiments of this utility model will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this utility model, and not all embodiments. Based on the embodiments of this utility model, all other embodiments obtained by those skilled in the art without creative effort are within the protection scope of this utility model.

[0023] In the description of this utility model, it should be understood that the terms "center", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this utility model.

[0024] like Figure 1 As shown, an online monitoring system for produced water quality in an oilfield includes a monitoring cabinet 1, a control component 2, and an analysis structure 3. The control component 2 and the analysis structure 3 are installed in the monitoring cabinet 1. The control component 2 is used to control the operation of the analysis structure 3 and the transmission of collected data. The analysis structure 3 is used to monitor the produced water quality in real time. The analysis structure 3 is electrically connected to the control component 2.

[0025] like Figure 1 , 2 As shown in Figure 3, the analysis structure 3 includes an analysis pipeline and analysis components. The analysis components include a cleaning device 31, a pH detection device 32, a water quality detection device 33, and a water flow control device 34. The analysis pipeline includes an inlet pipe 35, a delivery pipe 36, an outlet pipe 37, and a return pipe 38. The inlet pipe 35 and the outlet pipe 37 are respectively connected to the front and rear ends of the delivery pipe 36 to form a passage. The two ends of the return pipe 38 are respectively connected to the front and rear ends of the delivery pipe 36 to form a loop. The cleaning device 31, the pH detection device 32, the water quality detection device 33, and the water flow control device 34 are arranged sequentially from front to back on the delivery pipe 36.

[0026] like Figure 2, 3 As shown, this utility model has two modes. The first mode is the real-time detection mode. In this mode, the valves on the inlet pipe 35 and the outlet pipe 37 are open, the valve on the return pipe 38 is closed, and the sewage outlet on the first flow pool is closed, forming a one-way passage. The collected water enters the delivery pipe 36 through the inlet pipe 35. The collected water passes through the pH detection device 32, the water quality detection device 33 and the water flow control device 34 on the delivery pipe 36 in sequence. After realizing real-time online detection of water quality, the collected water is discharged through the outlet pipe 37. The second method is the cleaning mode. First, the drain outlet on the first flow tank is closed, the valves on the inlet pipe 35 and the outlet pipe 37 are closed, and the valve on the return pipe 38 is opened to form a circulation loop. The cleaning solution enters the delivery pipe 36 through the cleaning pump, and then passes through the pH detection device 32, the water quality detection device 33 and the water flow control device 34 on the delivery pipe 36 in sequence. Then it returns to the delivery pipe 36 through the return pipe 38. After the pipeline is cleaned by multiple circulations, the drain outlet on the first flow tank is opened to discharge the cleaning solution, thus completing the cleaning operation.

[0027] like Figure 1 , 2 As shown in Figure 3, the water flow control device 34 further includes a booster pump 341, a water flow switch 342, and a switch controller. The booster pump 341 and the water flow switch 342 are arranged sequentially from front to back on the water delivery pipe 36. The switch controller is located in the water delivery pipe 36 and is electrically connected to the water flow switch 342. The water flow switch 342 is electrically connected to the booster pump 341.

[0028] Furthermore, the switch controller includes a first temperature sensor and a second temperature sensor, the first temperature sensor being disposed on the front side of the flow switch 342 and the second temperature sensor being disposed on the rear side of the flow switch 342. Flow rate measurement in the pipeline is achieved through heat exchange. When the flow switch 342 is not open, i.e., when there is no medium flowing in the pipeline, the first temperature sensor is located in the extracted water in front of the flow switch 342, and the second temperature sensor is located in the air in front of the flow switch 342. Since the two temperature sensors are located in different media, and different media have different specific heat capacities resulting in different temperatures, there is a temperature difference between the two temperature sensors. When the flow switch 342 is opened, the second temperature sensor is also located in the medium and its temperature rises, reducing the temperature difference between the two temperature sensors. The larger the flow rate, the smaller the temperature difference between the two temperature sensors, until the flow is full, at which point the temperatures of the two temperature sensors are the same. Therefore, the flow rate in the pipeline is calculated based on the thermal conductivity parameters of the flowing medium and the temperature difference setting, thereby controlling the opening of the flow switch 342. The opening of the flow switch 342 is also linked with the booster pump 341 to achieve joint control in different modes.

[0029] Furthermore, the water quality testing device 33 includes a first flow tank and a first sensor. The first sensor is installed in the first flow tank. The first flow tank is provided with an inlet, an outlet and a drain outlet. The inlet and outlet of the first flow tank are both connected to the water supply pipe 36.

[0030] Furthermore, the inlet and outlet are located at the bottom of the first flow pool, and the outlet is located at the top of the first flow pool.

[0031] Furthermore, the pH detection device 32 includes a second flow cell and a second sensor. The second sensor is disposed in the second flow cell, and the inlet and outlet of the second flow cell are both connected to the water supply pipe 36.

[0032] like Figure 1 , 2 As shown in Figure 3, the cleaning device 31 further includes a cleaning pump and a cleaning liquid bottle. The cleaning liquid bottle is connected to the cleaning pump, and the cleaning pump is connected to the water supply pipe 36. The cleaning pump is a diaphragm pump.

[0033] Furthermore, the control component 2 includes an analysis controller, a data acquisition module, a communication module, a circuit controller, a server, and a display. The analysis structure 3 is electrically connected to the analysis controller, which controls the operation of the analysis structure 3. The analysis controller is also electrically connected to the data acquisition module, which controls the operation of the data acquisition module. The data acquisition module is connected to the server via the communication module. The analysis structure 3 transmits analysis data to the data acquisition module, which then transmits the analysis data to the server via the communication module. The server distributes the data to the display, which is connected to the server. The circuit controller is electrically connected to the water flow control device 34 and the cleaning device 31, controlling the automatic start-up, shutdown, and linkage of the water flow control device 34 and the cleaning device 31.

[0034] Furthermore, the server is located in a data center and equipped with a UPS power supply to ensure the safety of the data received by the server and prevent data loss. The server transmits data to the computer, and the display includes mobile phones and client computers, all of which can view the data online, including the real-time status of each module, the collected parameters, real-time curves, historical curves, and various data queries of historical data.

[0035] Preferably, the analysis controller is Thermo Fisher Scientific's Alpha Pro CF600 multi-channel intelligent controller, the first sensor is used to detect oil and suspended solids in water, and Thermo Fisher Scientific's CFOIW series digital integrated sensor for oil and suspended solids in water is selected, and the second sensor is Thermo Fisher Scientific's ROSS differential electrode.

[0036] Furthermore, the inlet pipe 35, the delivery pipe 36, the outlet pipe 37, and the return pipe 38 are transparent PVC pipes, allowing inspectors to visually observe the water quality and pipe contamination, and then initiate the cleaning mode.

[0037] Furthermore, valves are provided on the inlet pipe 35, outlet pipe 37 and return pipe 38, and the valves are ball valves.

[0038] Preferably, the testing cabinet 1 is a movable explosion-proof cabinet used for system integration and safety assurance. The testing cabinet 1 has two doors, front and back, and a base at the bottom. The base is equipped with self-locking casters for movement, and a lifting lug at the top for hoisting. The control component 2 is located at the upper part of the testing cabinet 1, and the analysis structure 3 is located at the lower part of the testing cabinet 1.

[0039] It will be apparent to those skilled in the art that this invention is not limited to the details of the exemplary embodiments described above, and that it can be implemented in other specific forms without departing from the spirit or essential characteristics of this invention. Therefore, the embodiments should be considered illustrative and non-limiting in all respects, and the scope of this invention is defined by the appended claims rather than the foregoing description. Thus, all variations falling within the meaning and scope of equivalents of the claims are intended to be included within this invention, and no reference numerals in the claims should be construed as limiting the scope of the claims.

Claims

1. An online monitoring system for produced water quality in oilfields, characterized in that: It includes a testing cabinet (1), a control component (2) and an analysis structure (3), wherein the control component (2) and the analysis structure (3) are disposed in the testing cabinet (1), and the analysis structure (3) is electrically connected to the control component (2); The analysis structure (3) includes an analysis pipeline and analysis components. The analysis components include a cleaning device (31), a pH detection device (32), a water quality detection device (33), and a water flow control device (34). The analysis pipeline includes an inlet pipe (35), a delivery pipe (36), an outlet pipe (37), and a return pipe (38). The inlet pipe (35) and the outlet pipe (37) are respectively connected to the front end and the rear end of the delivery pipe (36) to form a passage. The two ends of the return pipe (38) are respectively connected to the front end and the rear end of the delivery pipe (36) to form a loop. The cleaning device (31), the pH detection device (32), the water quality detection device (33), and the water flow control device (34) are arranged sequentially from front to back on the delivery pipe (36).

2. The online oilfield produced water quality monitoring system according to claim 1, characterized in that: The water flow control device (34) includes a booster pump (341), a water flow switch (342), and a switch controller. The booster pump (341) and the water flow switch (342) are arranged sequentially from front to back on the water delivery pipe (36). The switch controller is located in the water delivery pipe (36) and is electrically connected to the water flow switch (342). The water flow switch (342) is electrically connected to the booster pump (341).

3. The online oilfield produced water quality monitoring system according to claim 2, characterized in that: The switch controller includes a first temperature sensor and a second temperature sensor. The first temperature sensor is located on the front side of the flow switch (342), and the second temperature sensor is located on the rear side of the flow switch (342).

4. The online monitoring system for oilfield produced water quality according to claim 1, characterized in that: The water quality testing device (33) includes a first flow tank and a first sensor. The first sensor is installed in the first flow tank. The first flow tank is provided with an inlet, an outlet and a drain outlet. The inlet and outlet of the first flow tank are both connected to the water supply pipe (36).

5. The online monitoring system for produced water quality in oilfields according to claim 1, characterized in that: The pH detection device (32) includes a second flow cell and a second sensor, wherein the second sensor is disposed in the second flow cell.

6. The online monitoring system for oilfield produced water quality according to claim 1, characterized in that: The cleaning device (31) includes a cleaning pump and a cleaning liquid bottle, the cleaning liquid bottle being connected to the cleaning pump, and the cleaning pump being connected to the water supply pipe (36).

7. The online monitoring system for oilfield produced water quality according to claim 1, characterized in that: The control component (2) includes an analysis controller, a data acquisition module, a communication module, a circuit controller, a server, and a display. The analysis structure (3) is electrically connected to the analysis controller. The analysis controller is electrically connected to the data acquisition module. The data acquisition module is connected to the server through the communication module. The display is connected to the server. The circuit controller is electrically connected to the water flow control device (34) and the cleaning device (31).

8. The online monitoring system for oilfield produced water quality according to claim 1, characterized in that: The inlet pipe (35), the delivery pipe (36), the outlet pipe (37), and the return pipe (38) are all made of transparent PVC pipes.

9. The online monitoring system for produced water quality in oilfields according to claim 1, characterized in that: Valves are installed on the inlet pipe (35), outlet pipe (37) and return pipe (38).

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