A standard detection device for oil and gas field produced water treatment

Abstract

The utility model discloses a kind of oil and gas field produced water treatment standard detection devices, it is related to environmental protection engineering technical field, including filter box and detection box, the filter box upper end is equipped with multi-point rain distributor, the multi-point rain distributor is equipped with inlet pipe, the filter box lower end is equipped with drain pipe, the drain pipe is connected with detection box one end by connecting assembly, the detection box other end is equipped with drain pipe, and circulation assembly is equipped between the drain pipe and the inlet pipe;Gravel layer, quartz sand layer, PES filter material layer, magnetite layer and modified fiber ball layer are installed in the filter box by mounting assembly;The utility model passes through the filter material layer structure and gradation in optimization filter box, solve the problem that traditional filter material combination is easily mixed, and the problem of insufficient sewage interception capacity, by setting circulation assembly, realize the secondary filtration treatment of water sample that does not reach standard, solve the drawback that traditional device needs manual intervention when single filtration does not reach standard.

Description

Technical Field

[0001] This utility model relates to the field of environmental engineering technology, specifically to a compliance testing device for produced water treatment in oil and gas fields. Background Technology

[0002] In the process of oil and gas field development, produced water is a significant pollutant generated alongside crude oil and natural gas extraction. Its composition is extremely complex, containing large amounts of suspended solids, petroleum substances, heavy metals, and soluble organic matter. Improper treatment leading to direct discharge or reinjection can not only cause severe environmental pollution but also potentially disrupt normal oil and gas field operations. Therefore, it is crucial to conduct quality testing on the treated produced water to ensure it meets standards. Pre-treatment of water samples before testing, especially the filtration process, directly affects the accuracy and reliability of the test results.

[0003] Currently, in the pretreatment filtration system of oil and gas field produced water treatment compliance testing devices, the selection and configuration of filter media are the core factors affecting filtration efficiency. Traditional filtration systems often use a combination of anthracite and magnetite filter media, but this approach has several problems in practical applications. Regarding particle size distribution, the traditional selection of anthracite and magnetite particle sizes is not reasonable, and the support layer thickness is relatively thin (usually 200mm), causing fine particles to easily float, resulting in a high risk of filter layer mixing and affecting the stability and thoroughness of filtration.

[0004] Meanwhile, the relatively small density difference in traditional filter media combinations makes the filter layer prone to stratification and instability under the influence of factors such as water flow impact, further reducing the interception efficiency of suspended solids. Furthermore, traditional anthracite filter media has limited ability to intercept suspended solids, making it difficult to meet the filtration requirements of produced water with complex compositions. This results in some pollutants remaining in the filtered water sample, interfering with subsequent compliance testing results and potentially leading to misjudgments of the treated water quality. Therefore, those skilled in the art have provided a compliance testing device for oil and gas field produced water treatment to solve the problems mentioned in the background art. Utility Model Content

[0005] The purpose of this invention is to provide a compliance testing device for produced water treatment in oil and gas fields, so as to solve the problems mentioned in the background art.

[0006] To achieve the above objectives, this utility model provides the following technical solution:

[0007] A compliance testing device for produced water treatment in oil and gas fields, comprising:

[0008] A filter box and a detection box are provided. A multi-point rain distributor is installed on the upper end of the filter box. The multi-point rain distributor is equipped with an inlet pipe. A drain pipe is provided at the lower end of the filter box. The drain pipe is connected to one end of the detection box through a connecting assembly. A drain pipe is provided at the other end of the detection box. A circulation assembly is provided between the drain pipe and the inlet pipe.

[0009] The filter box contains a gravel layer, a quartz sand layer, a PES filter media layer, a magnetite layer, and a modified fiber ball layer, all installed by an installation assembly. The gravel layer is 300 mm thick.

[0010] Preferably, the connecting assembly includes a connecting pipe and a water pump. The two ends of the connecting pipe are respectively connected to a drain pipe and a testing box. The water pump is connected to the connecting pipe and is installed on the testing box.

[0011] Preferably, the circulation assembly includes a circulation pipe and a circulation pump. The two ends of the circulation pipe are connected to an inlet pipe and a drain pipe, respectively. The circulation pump is installed on the detection box and is connected to the circulation pipe.

[0012] Preferably, a first electrically controlled valve is installed on both the drain pipe and the circulation pipe, and a second electrically controlled valve is installed on both the inlet pipe and the outlet pipe.

[0013] Preferably, the installation assembly includes several installation frames, two installation plates, and several locking plates. The locking plates are connected to the corresponding installation frames. The two installation plates are fixedly installed inside the filter box, and each of the two installation plates has a locking groove. The locking plates are locked in the locking groove. The gravel layer, quartz sand layer, PES filter media layer, magnetite layer, and modified fiber ball layer are arranged sequentially from bottom to top inside the installation frame. The installation frame has a pull groove.

[0014] Preferably, each of the several card plates is equipped with an RFID tag, and the filter box is equipped with a fixed reader and a display screen, and the RFID tag is electrically connected to the fixed reader and the display screen.

[0015] Preferably, the uppermost mounting frame has a mounting groove, a baffle is installed in the mounting groove by bolts, and an inspection door is installed on the filter box by bolts, with a sealing ring between the inspection door and the filter box.

[0016] Preferably, the detection box is equipped with a controller, which is electrically connected to the water pump, the detection box, the circulating pump, the first solenoid valve, and the second solenoid valve.

[0017] Compared with the prior art, the beneficial effects of this utility model are:

[0018] 1. This invention solves the problems of easy mixing and insufficient interception capacity of traditional filter media combinations by optimizing the structure and gradation of the filter media layers within the filter box. A 300mm thick gravel layer serves as a support layer, effectively preventing fine particles from floating to the surface. Combined with the layered arrangement of quartz sand, PES filter media, magnetite, and modified fiber ball layers, the density differences and particle size distribution of the different filter media enhance the stability of the filter layer layering and reduce the risk of mixing. Simultaneously, the fiber structure of the modified fiber ball layer and the high-temperature resistance of the PES filter media significantly improve the interception efficiency of suspended solids, petroleum, and other pollutants, providing a reliable water sample basis for accurate subsequent testing in the detection chamber and avoiding the data distortion problems caused by poor pretreatment in traditional devices.

[0019] 2. This invention, by incorporating a circulation component, enables secondary filtration of substandard water samples, overcoming the drawback of traditional devices requiring manual intervention when single-pass filtration fails. When the filtered water sample fails to meet standards as determined by the testing chamber, the circulation component returns the sample to the inlet pipe via the drain pipe, allowing it to re-enter the filtration chamber through the multi-point water distributor for secondary filtration until the water quality meets standards, at which point the testing chamber completes the testing. This design not only improves the device's automation capabilities and reduces manual operation costs but also ensures that the water samples entering the testing stage always meet pretreatment requirements, significantly enhancing the device's adaptability to complex composition of extracted water and the reliability of the testing results. Attached Figure Description

[0020] Figure 1 This is a schematic diagram of the structure of a compliance testing device for produced water treatment in oil and gas fields, as described in an embodiment of this application.

[0021] Figure 2 This is a cross-sectional view of the filter box of a compliance testing device for oil and gas field produced water treatment in an embodiment of this application.

[0022] Figure 3 for Figure 2 Enlarged view of point A in the middle;

[0023] Figure 4 This is an exploded structural diagram of the mounting frame of a compliance testing device for oil and gas field produced water treatment, as described in an embodiment of this application.

[0024] In the diagram: 1. Filter box; 2. Detection box; 3. Multi-point rain distributor; 4. Inlet pipe; 5. Drain pipe; 6. Drainage pipe; 7. Gravel layer; 8. Quartz sand layer; 9. PES filter media layer; 10. Magnetite layer; 11. Modified fiber ball layer; 12. Connecting pipe; 13. Water pump; 14. Circulation pipe; 15. Circulation pump; 16. First solenoid valve; 17. Second solenoid valve; 18. Mounting frame; 19. Mounting plate; 20. Clamping plate; 21. Clamping groove; 22. Pulling groove; 23. RFID tag; 24. Fixed reader / writer; 25. Display screen; 26. Mounting slot; 27. Baffle net; 28. Inspection door; 29. ​​Sealing ring; 30. Controller. Detailed Implementation

[0025] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0026] Please see Figures 1-4 This utility model provides a technical solution:

[0027] A compliance testing device for produced water treatment in oil and gas fields, comprising:

[0028] The filter box 1 and the detection box 2 are provided. The upper end of the filter box 1 is equipped with a multi-point rain distributor 3, which is provided with an inlet pipe 4. The lower end of the filter box 1 is provided with a drain pipe 5. The drain pipe 5 is connected to one end of the detection box 2 through a connecting assembly. The connecting assembly includes a connecting pipe 12 and a water pump 13. The two ends of the connecting pipe 12 are connected to the drain pipe 5 and the detection box 2, respectively. The water pump 13 is connected to the connecting pipe 12 and is installed on the detection box 2. The other end of the detection box 2 is provided with a drain pipe 6. A circulation assembly is provided between the drain pipe 6 and the inlet pipe 4. The circulation assembly includes a circulation pipe 14 and a circulation pump 15. The two ends of the circulation pipe 14 are connected to the inlet pipe 4 and the drain pipe 6, respectively. The circulation pump 15 is installed on the detection box 2 and is connected to the circulation pipe 14. A first solenoid valve 16 is installed on both the drain pipe 6 and the circulation pipe 14. A second solenoid valve 17 is installed on both the inlet pipe 4 and the drain pipe 5.

[0029] When the produced water treatment compliance testing device in the oil and gas field enters the inlet filtration stage, the controller 30 controls the opening of the second electrically controlled valve 17 on the inlet pipe 4. The produced water enters the multi-point rain distributor 3 through the inlet pipe 4. The function of the multi-point rain distributor 3 is to evenly distribute the produced water into the filter box 1, so that the produced water can fully contact each filter media layer and improve the filtration effect. After filtration, it enters the post-filtration transportation stage. The controller 30 controls the opening of the second electrically controlled valve 17 on the drain pipe 5. The filtered water enters the connecting pipe 12 through the drain pipe 5. The controller 30 controls the start of the water pump 13. The water pump 13 provides power for the water transportation, and transports the filtered water through the connecting pipe 12 to the testing box 2 for testing. This process realizes the water transportation between the filter box 1 and the testing box 2 with the help of the connecting component. After the water enters the testing box 2, the testing box 2 performs compliance testing on it. If the water quality meets the standards, the controller 30 opens the first electrically controlled valve 16 on the drain pipe 6, allowing the compliant water to be discharged through the drain pipe 6. If the water quality fails to meet the standards, the controller 30 closes the first electrically controlled valve 16 on the drain pipe 6, opens the first electrically controlled valve 16 on the circulation pipe 14, and starts the circulation pump 15. The circulation pump 15 provides power, and through the circulation pipe 14, the non-compliant water is transported from the drain pipe 6 back to the inlet pipe 4, and then re-enters the filter box 1 for filtration, forming a circulating treatment process until the water quality meets the standards. This circulating process demonstrates the working principle of the circulation components, ensuring that the discharged water meets the standards. In this series of operations, the controller 30 controls the on / off state of each electrically controlled valve, combined with the start and stop of the water pump 13 and the circulation pump 15, to achieve the orderly flow of the extracted water among the components, which is a manifestation of the control principle.

[0030] The filter box 1 contains a gravel layer 7, a quartz sand layer 8, a PES filter media layer 9, a magnetite layer 10, and a modified fiber ball layer 11, all installed via an installation assembly. The gravel layer 7 is 300mm thick. The installation assembly includes several mounting frames 18, two mounting plates 19, and several locking plates 20. The locking plates 20 are connected to corresponding mounting frames 18. The two mounting plates 19 are fixedly installed inside the filter box 1, and each mounting plate 19 has a locking groove 21. The locking plates 20 engage within the locking grooves 21. The gravel layer 7, quartz sand layer 8, and PES filter media layer 9... Magnetite layer 10 and modified fiber ball layer 11 are arranged sequentially from bottom to top in mounting frame 18. Mounting frame 18 has grooves 22. RFID tags 23 are installed on several snap-fit ​​plates 20. Fixed reader 24 and display screen 25 are installed on filter box 1. RFID tags 23 are electrically connected to fixed reader 24 and display screen 25. Mounting slot 26 is provided on the top mounting frame 18. A baffle 27 is installed in mounting slot 26 by bolts. Inspection door 28 is installed on filter box 1 by bolts. A sealing ring 29 is provided between inspection door 28 and filter box 1.

[0031] The extracted water then passes sequentially through the baffle 27 within the uppermost mounting frame 18. The baffle 27 prevents large impurities from entering the filter media layer, avoiding clogging, and also prevents displacement or loss of the filter media layer under the impact of water flow. Next, the extracted water flows from top to bottom through the modified fiber ball layer 11, the magnetite layer 10, the PES filter media layer, the quartz sand layer 8, and the gravel layer 7. These five filter media layers perform their filtering functions according to their respective characteristics: the modified fiber ball layer 11 removes suspended particles and colloidal substances from the water; the magnetite layer 10 adsorbs ferromagnetic impurities; the PES filter media layer further filters fine particles; and the quartz sand layer 8 and the 300mm thick gravel layer 7 provide support and filtration. Through multi-layer synergistic filtration, the impurity content in the water is reduced, which is the core manifestation of the filtration principle. These filter media layers are installed within the mounting frame 18, which is fixed by the locking plate 20 and the locking groove 21 on the mounting plate 19 inside the filter box 1, enabling convenient installation and removal of the filter media layers, which is the working principle of the installation assembly. When the filter media needs replacement or maintenance, the filter media maintenance stage begins. The access door 28 is opened via bolts, providing access for filter media maintenance. Pulling the pull groove 22 on the mounting frame 18 disengages the locking plate 20 from the locking groove 21 of the mounting plate 19, allowing the mounting frame 18 to be removed for filter media replacement. After replacement, the locking plate 20 is re-locked into the locking groove 21, the access door 28 is closed, and the bolts are tightened. This process fully utilizes the structural features of the mounting components, enabling convenient maintenance of the filter media.

[0032] Throughout the entire operation of the device, status monitoring is continuous. The fixed reader 24 continuously reads the RFID tag information on each card plate 20 and transmits the information to the display screen 25. The staff can understand the status of each filter layer in real time through the display screen 25, which facilitates timely replacement and maintenance. This continuous monitoring process reflects the installation and monitoring principles in the operation of the device.

[0033] In the above embodiment, a controller 30 is installed on the detection box 2. The controller 30 is electrically connected to the water pump 13, the detection box 2, the circulating pump 15, the first solenoid valve 16, and the second solenoid valve 17.

[0034] Filter media material: Quartz sand (density 2.65 g / cm³) is used to replace anthracite, combined with magnetite (density 4.8-5.2 g / cm³), and the support layer thickness is increased to 300 mm. New filter media introduction: Modified fiber ball filter media (density 0.9-1.0 g / cm³) replaces anthracite, with fiber diameter 50-100 μm and porosity >95%.

[0035] Existing technology: Traditional filter media mixing design (such as anthracite + magnetite) does not explicitly utilize the density difference stratification principle, but only optimizes the filtration effect by adjusting the particle size (such as patent CN201820227147.8, which uses a porous plate for water distribution, but does not involve the density difference of the filter media).

[0036] The innovation of this embodiment is that it proposes for the first time that a density difference of >2.0g / cm³ is used as a criterion for the stability of filter layer stratification, and verifies the effect of blocking fine particles (<0.5mm) above the support layer through experiments, thus overcoming the technical limitation of traditional mixed filter media being prone to confusion.

[0037] When quartz sand is combined with magnetite, it was unexpectedly found that a density difference exceeding 2.0 g / cm³ can form a stable stratified interface, which effectively blocks fine particles (such as suspended matter with a particle size <0.5 mm) above the support layer. This effect cannot be predicted by a single filter material or existing technology (such as simply adjusting the particle size).

[0038] High-temperature resistant filter media: Polyethersulfone (PES, temperature resistant up to 150℃), with an expansion rate of <5% at 80℃. Increased filter bed thickness: From 1.2m to 1.5m, and the flow rate decreased from 20m / h to 15m / h. Optimized water distribution system: Multi-point water distributors were used, reducing the standard deviation of water distribution uniformity from 0.8m / h to 0.2m / h.

[0039] Existing technologies: single technology optimization (such as patent CN201921973745.0 which only optimizes the water distributor structure) or a combination of two technologies (such as high-temperature resistant filter media + filter layer thickness adjustment).

[0040] The innovation of this embodiment lies in its experimental verification of the stability of the comprehensive improvement scheme under extreme operating conditions, overcoming the limitations of existing technologies that can only solve a single problem (such as only reducing resistance or only extending the filter media life).

[0041] When PES filter media is combined with a multi-point water distributor, it was unexpectedly discovered that localized compaction caused by the expansion of the filter media at high temperatures was offset by the uniformity of water distribution, resulting in an overall porosity fluctuation of less than 3%. In contrast, the porosity fluctuation of existing technologies (such as those using only high-temperature resistant filter media) still reaches 10%-15%. This synergistic effect breaks through the cognitive bottleneck that "the temperature resistance of filter media is independent of hydraulic distribution".

[0042] Quartz sand (2-4mm) + magnetite (1-3mm) + modified fiber balls (support layer); When the filter media gradation is optimized, high-temperature resistant materials are used, and multi-point water distribution is combined, it was unexpectedly found that the system can still operate stably under high temperature and high suspended solids load (such as influent SS>500mg / L), while existing technologies (such as only optimizing the gradation or only using high-temperature resistant filter media) will result in filter layer penetration or a surge in resistance under the same operating conditions. This comprehensive effect cannot be predicted by a single technology or a combination of existing technologies.

[0043] It should be noted that the specific models and specifications of the detection box 2, RFID tag 23, reader, display screen 25, controller 30, water pump 13, detection box 2, circulation pump 15, first solenoid valve 16 and second solenoid valve 17 need to be selected and determined according to the actual specifications of the device. The specific selection calculation method adopts the existing technology in this field, so it will not be described in detail.

[0044] Although embodiments of the present invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the present invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A compliance testing device for produced water treatment in oil and gas fields, characterized in that, include: A filter box (1) and a detection box (2) are provided. A multi-point rain distributor (3) is installed on the upper end of the filter box (1). An inlet pipe (4) is provided on the multi-point rain distributor (3). A drain pipe (5) is provided at the lower end of the filter box (1). The drain pipe (5) is connected to one end of the detection box (2) through a connecting component. A drain pipe (6) is provided at the other end of the detection box (2). A circulation component is provided between the drain pipe (6) and the inlet pipe (4). The filter box (1) is equipped with a gravel layer (7), a quartz sand layer (8), a PES filter media layer (9), a magnetite layer (10), and a modified fiber ball layer (11) through an installation assembly. The gravel layer (7) is a gravel layer (7) with a thickness of 300 mm.

2. The compliance testing device for oil and gas field produced water treatment according to claim 1, characterized in that: The connection assembly includes a connecting pipe (12) and a water pump (13). The two ends of the connecting pipe (12) are connected to the drain pipe (5) and the detection box (2) respectively. The water pump (13) is connected to the connecting pipe (12) and is installed on the detection box (2).

3. The compliance testing device for oil and gas field produced water treatment according to claim 2, characterized in that: The circulation assembly includes a circulation pipe (14) and a circulation pump (15). The two ends of the circulation pipe (14) are connected to the inlet pipe (4) and the outlet pipe (6) respectively. The circulation pump (15) is installed on the detection box (2) and is connected to the circulation pipe (14).

4. The compliance testing device for oil and gas field produced water treatment according to claim 3, characterized in that: A first solenoid valve (16) is installed on both the drain pipe (6) and the circulation pipe (14), and a second solenoid valve (17) is installed on both the inlet pipe (4) and the outlet pipe (5).

5. The compliance testing device for oil and gas field produced water treatment according to claim 1, characterized in that: The installation assembly includes several installation frames (18), two installation plates (19), and several locking plates (20). Several locking plates (20) are connected to the corresponding installation frames (18). The two installation plates (19) are fixedly installed in the filter box (1), and each of the two installation plates (19) has a locking groove (21). The locking plates (20) are locked in the locking groove (21). The gravel layer (7), quartz sand layer (8), PES filter media layer (9), magnetite layer (10), and modified fiber ball layer (11) are arranged in the installation frame (18) from bottom to top. The installation frame (18) has a pull groove (22).

6. The compliance testing device for oil and gas field produced water treatment according to claim 5, characterized in that: RFID tags (23) are installed on several of the card plates (20), and a fixed reader (24) and a display screen (25) are installed on the filter box (1). The RFID tags (23) are electrically connected to the fixed reader (24) and the display screen (25).

7. The compliance testing device for oil and gas field produced water treatment according to claim 5, characterized in that: The uppermost mounting frame (18) has a mounting groove (26), and a baffle (27) is installed in the mounting groove (26) by bolts. The filter box (1) has an inspection door (28) installed by bolts, and a sealing ring (29) is provided between the inspection door (28) and the filter box (1).

8. The compliance testing device for oil and gas field produced water treatment according to claim 4, characterized in that: The detection box (2) is equipped with a controller (30), which is electrically connected to the water pump (13), the detection box (2), the circulating pump (15), the first solenoid valve (16), and the second solenoid valve (17).

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