Filtering device for high-temperature produced water of offshore oilfield

Abstract

The utility model relates to the technical field of filtering equipment, aims to solve the problem that the existing high-temperature produced water filtering device is easy to generate biological membranes and wormholes so as to seriously influence the filtering effect, and provides an offshore oilfield high-temperature produced water filtering device, which mainly comprises a filtering cylinder filled with a glass filtering material; the first water distribution plate and the second water distribution plate are respectively arranged at the first end and the second end of the filter cartridge and are respectively communicated with the interior of the filter cartridge, and the glass filter material is pressed by the first water distribution plate and the second water distribution plate; water to be filtered flows through the glass filter material through the first water distribution plate to be filtered and then flows out along the second water distribution plate. The glass filter material with stable chemical property is used as a filter medium, and the water distribution plate is used for compressing the glass filter material while distributing water, so that the glass filter material is not easy to displace, biological membranes and wormholes are prevented from being generated, and the filtering effect is obviously improved.

Description

Technical Field

[0001] This utility model relates to the field of filtration equipment technology, and in particular to a filtration device for high-temperature produced water in offshore oil fields. Background Technology

[0002] When treating high-temperature produced water from oil extraction and geothermal energy development, quartz sand and anthracite are typically used as the filter media in high-temperature produced water filters to remove suspended particles and some organic matter from the water to be filtered, helping the produced water meet subsequent reuse or discharge standards.

[0003] However, high-temperature produced water contains microorganisms and organic matter, and its pH range is wide, potentially acidic or alkaline. When water flows through filter media such as quartz sand or anthracite, the free silica in these media, under alkaline conditions, easily produces sticky reactants after being eroded by the produced water. This leads to filter media wear, making it easy for microorganisms to adhere to the rough and porous surface, aggregate, grow, and secrete substances to form a biofilm. Subsequently, microbial metabolic products further erode the filter media surface. Coupled with long-term water erosion, this causes the filter media particle structure to become unstable and shift, resulting in wormholes, disrupting filtration uniformity, and reducing filtration efficiency.

[0004] For example, a "rapid filter media filtration device" disclosed in Chinese patent literature, publication number CN208378520U, mainly includes a filter media box with an inlet pipe at the bottom, five layers of quartz sand and an anthracite layer above, and an outlet pipe at the top. During operation, the valve is opened, and wastewater flows out from the outlet hole of the inlet pipe, undergoing multi-layer filtration through the multiple layers of quartz sand and anthracite. The filtered wastewater then enters the outlet pipe through the inlet hole and is discharged, achieving filtration of domestic and industrial water. However, the filter media used in this scheme are multiple layers of quartz sand and anthracite, and the boundaries between the layers are relatively blurred. This means that when the filter media particles are eroded, causing local instability, biofilm adhesion or wormholes may occur, affecting the stability of the overall filter layer structure and thus impacting filtration efficiency and effectiveness. Summary of the Invention

[0005] This invention primarily addresses the problem that existing high-temperature water filtration devices are prone to generating biofilms and wormholes, which severely affect the filtration effect.

[0006] To address the aforementioned technical problems, this utility model provides a filtration device for high-temperature produced water in offshore oil fields, mainly comprising: a filter cylinder filled with glass filter media; a first water distribution plate and a second water distribution plate, the first water distribution plate and the second water distribution plate being respectively disposed at a first end and a second end of the filter cylinder and respectively communicating with the interior of the filter cylinder, and the first water distribution plate and the second water distribution plate pressing the glass filter media; wherein, the water to be filtered flows through the first water distribution plate, is filtered by the glass filter media, and then flows out along the second water distribution plate.

[0007] Preferably, the height of the filter cartridge is in the range of 10-20cm, and the filling height of the glass filter media is not higher than the height of the filter cartridge. Setting the height of the filter cartridge between 10-20cm can significantly accelerate the filtration speed, reduce water pressure loss, and improve filtration efficiency.

[0008] Preferably, the glass filter media consists of uniform glass particles with a particle size ranging from 0.2 to 8 mm and a particle density ranging from (2.5 ± 0.2) × 10⁻⁶. 3 kg / m³, bulk density range is (1.2~1.4)×10 3 kg / m³.

[0009] As a further preferred embodiment, the glass filter media comprises two or more layers. Along the direction from the second end to the first end of the filter cylinder, the particle size of the glass filter media is the same in the same layer and decreases layer by layer, so that the larger particle size glass filter media can support the smaller particle size glass filter media, thereby further maintaining the stability of the filled filter media.

[0010] Preferably, both the first water distribution plate and the second water distribution plate are either stainless steel microporous filter discs or stainless steel multilayer sintered mesh filter discs, and their thickness ranges from 1 to 8 mm.

[0011] Preferably, the pore size of both the first water distribution plate and the second water distribution plate is smaller than the particle size of their respective adjacent glass filter media.

[0012] Preferably, the first water distribution plate is connected to the first end of the filter cylinder via a flange, and the second water distribution plate is connected to the second end of the filter cylinder via a flange. Using a flange structure to connect the water distribution plate and the filter cylinder makes replacing the glass filter media more convenient.

[0013] Preferably, the first end and the second end of the filter cylinder are respectively provided with a first end cap and a second end cap, the first end cap having a first opening and the second end cap having a second opening; wherein, the water to be filtered passes sequentially through the first water distribution plate, the glass filter material and the second water distribution plate along the first opening, and is discharged from the second opening; the air intake or backwash water passes sequentially through the second water distribution plate, the glass filter material and the first water distribution plate from the second opening, and is discharged from the first opening.

[0014] As a further preferred embodiment, the first end cap is connected to the first water distribution plate via a flange, and the second end cap is connected to the second water distribution plate via a flange. Using a flange structure to connect the end cap and the water distribution plate simplifies the overall structure.

[0015] As a further preferred embodiment, the first end cap and the first water distribution plate form a first cavity, and the second end cap and the second water distribution plate form a second cavity.

[0016] The main beneficial effects of this utility model are as follows:

[0017] First, this utility model uses glass filter media as the filtration medium for high-temperature extracted water. Due to its properties of being free of free silicon and having stable chemical properties, it can reduce biological pollution of the filter media by the water to be filtered, and is less prone to the formation of biofilms and wormholes, thus significantly improving its service life and reducing the frequency of filter media replacement.

[0018] Secondly, this utility model adopts a connection method that combines a water distribution plate with a filter cylinder and presses the glass filter media together, making it less likely for the glass filter media to loosen or shift. Moreover, the water distribution plate can greatly promote the uniform distribution of the water to be filtered in the glass filter media, which can prevent local short-circuiting caused by uneven distribution of the water to be filtered, thereby further reducing biological pollution. Attached Figure Description

[0019] Figure 1 This is a structural diagram of a filtration device for high-temperature produced water in offshore oil fields, according to an embodiment of this utility model.

[0020] Figure 2 This is an exploded schematic diagram of a filtration device for high-temperature produced water in offshore oil fields, according to an embodiment of this utility model.

[0021] Figure 3 This is a top view of a filtration device for high-temperature produced water in offshore oil fields, according to an embodiment of this utility model.

[0022] Figure 4 This is a top view of the filter cylinder of a filtration device for high-temperature produced water in offshore oil fields, according to an embodiment of this utility model.

[0023] Figure 5This is a schematic diagram of the first water distribution plate structure of a filtration device for high-temperature produced water in offshore oil fields, according to an embodiment of this utility model.

[0024] Reference numerals: 1. First port, 2. First end cap, 21. First flange, 3. First water distribution plate, 4. Filter cylinder, 41. Second flange, 42. Third flange, 5. Second water distribution plate, 6. Second end cap, 61. Fourth flange, 7. Second port. Detailed Implementation

[0025] The technical solution of this utility model will be further described in detail below through embodiments and in conjunction with the accompanying drawings.

[0026] Example 1:

[0027] Please see Figure 1 and Figure 2 .

[0028] To address the problem that existing high-temperature produced water filtration devices are prone to biofilm and wormhole formation, which severely affects filtration efficiency, this embodiment provides a filtration device for high-temperature produced water in offshore oil fields, comprising: a filter cylinder 4, a first water distribution plate 3, a second water distribution plate 5, and glass filter media; the first and second water distribution plates respectively cover and are disposed at the first and second ends of the filter cylinder, forming a filling space in which glass filter media is filled, and the first and second water distribution plates press the glass filter media tightly to prevent displacement or loosening; wherein, the water to be filtered is distributed into the filter cylinder through the first water distribution plate, filtered by the glass filter media, and then flows out along the second water distribution plate.

[0029] This embodiment uses glass filter media as the filtration medium. Benefiting from the fact that glass filter media does not contain free silica, it does not alter the water composition due to the precipitation of free silica when in contact with alkaline, high-temperature produced water. In contrast, the free silica in existing quartz sand reacts chemically with the alkaline water to be filtered, generating a viscous aqueous solution that causes the filter media to stick together. This not only affects the filtration effect but also increases the frequency of backwashing, wasting produced water and causing inconvenience for equipment maintenance. Glass filter media itself has stable chemical properties. Even in high-temperature environments with produced water containing various complex components, it is not prone to chemical reactions with various substances in the water, maintaining its structure and performance for a long time and ensuring stable filtration. This reduces its susceptibility to external chemical interference, minimizing the occurrence of filter media performance degradation and water quality deterioration caused by chemical reactions. It ensures the quality and quantity of filtered water, extends the service life of the filter media, and reduces the investment cost of frequent filter media replacements.

[0030] The first and second water distribution plates cover both ends of the filter cylinder to form a filling space, and compress the glass filter media into it. The advantage of this compressed state is that the filling and compression make the gaps between the filter media relatively smaller and more uniform, reducing the space available for a large number of microorganisms to gather and grow, which is not conducive to the formation of biofilm. Moreover, the stable filling structure is not easy to loosen or deform under the long-term action of water flow, reducing the possibility of wormholes caused by the movement of filter media particles, thereby reducing the impact of biological pollution on the filtration effect and ensuring that the filtration process can be carried out continuously and efficiently.

[0031] The following is the water filtration process of the high-temperature produced water filtration device in this offshore oil field:

[0032] The high-temperature extracted water to be filtered flows to the first water distribution plate. The first water distribution plate plays a role in evenly distributing the water to be filtered, so that the water flows into the filter cylinder in a relatively stable and uniform manner. The tightly packed glass filter media filters the water to be filtered, effectively intercepting suspended particles, impurities, colloids, etc., preventing these substances from passing through with the water flow.

[0033] As the water to be filtered continuously passes through the glass filter media layer, pollutants are gradually filtered out. The water then reaches the second distribution plate, which guides the filtered water to flow steadily and orderly out of the filter cartridge, thus completing the entire filtration process for the high-temperature produced water. Influent with suspended solids of 20-50 mg / L and oil content of 10-15 mg / L, after filtration through the above process, yields effluent with suspended solids ≤5 mg / L and oil content ≤8 mg / L, which can then be reused or further treated according to relevant standards for discharge.

[0034] In a further preferred embodiment, the height of the filter cartridge ranges from 10 to 20 cm, and the filling height of the glass filter media is not higher than the height of the filter cartridge. In one specific embodiment, the height of the filter cartridge is 10 cm. In other specific embodiments, the height of the filter cartridge can also be 11 cm, 13.2 cm, 15.5 cm, 18 cm, 19.5 cm, 20 cm, etc. Regarding the filter layer thickness, the glass filter media within the above-mentioned height range forms a relatively suitable filter layer thickness. This avoids insufficient retention of impurities in the high-temperature extracted water due to an excessively thin filter layer, while also preventing excessive water flow resistance due to an excessively thick filter layer, which would affect the filtration speed. This allows water to flow smoothly through the filter layer, achieving a faster filtration speed, which helps to process more high-temperature extracted water per unit time and improves the overall filtration efficiency.

[0035] Furthermore, regarding water pressure loss, when the filter cartridge height and glass filter media filling height are within the aforementioned set range, the resistance to water flow through the filter media layer is relatively reasonable compared to settings that are too high or too low. Excessive thickness of the filter media layer will not cause the water flow to overcome excessive resistance, thus reducing water pressure loss during filtration. Therefore, high-pressure power equipment is not required to drive the water flow during filtration, significantly reducing energy consumption and ensuring system stability.

[0036] In another preferred embodiment, the glass filter media consists of uniform glass particles with a particle size ranging from 0.2 to 8 mm and a particle density ranging from (2.5 ± 0.2) × 10⁻⁶. 3 kg / m³, bulk density range is (1.2~1.4)×10 3 kg / m³. In one specific embodiment, the glass particles have a particle size of 0.2 mm and a particle density of 2.3 × 10⁻⁶. 3 kg / m³, bulk density is 1.2×10 3 kg / m³. In other specific embodiments, the glass particles have a particle size of 8 mm and a particle density of 2.7 × 10⁻⁶. 3 kg / m³, bulk density is 1.4×10 3 kg / m³. Or, the glass particles have a particle size of 4 mm and a particle density of 2.5 × 10⁻⁶. 3 kg / m³, bulk density is 1.3×10 3 kg / m³. Furthermore, the above values ​​can be freely combined within their set range to adapt to different applications. The glass particles can be irregularly shaped but generally uniform, or preferably, uniformly sized glass beads.

[0037] Regarding the selection of particle size range, smaller glass particles, such as those close to 0.2mm, can effectively intercept finer suspended particles and impurities in the water, greatly improving the clarity of the effluent. This is suitable for applications requiring high water quality and fine filtration. Larger glass particles, such as those close to 8mm, allow for a relatively larger water flow while maintaining a certain filtration effect, reducing flow resistance. This makes them suitable for scenarios with high requirements for filtration speed and pressure loss. Furthermore, appropriate particle size settings can extend the effective lifespan of the filter media, reducing the cost and operational hassle of frequent media replacements.

[0038] The selection of a specific particle density range indicates that the glass filter media has relatively stable material properties and relatively uniform quality. A stable particle density means that the internal structure of the glass filter media is relatively compact and its material composition is relatively consistent. When faced with the complex composition of high-temperature effluent and high-temperature environments, it is less prone to internal structural changes due to density differences, such as localized expansion, contraction, or uneven dissolution. This ensures that it maintains stable physical and chemical properties throughout the filtration process, effectively performing its filtration function and reliably intercepting impurities in the water.

[0039] The selection of a specific bulk density range reflects the moderate density of the glass filter media in its natural packing state. This packing characteristic results in a more reasonable filter media layer structure within the filter cartridge. The gaps between the particles are neither too large, allowing many impurities to pass through unfiltered, nor too small, causing excessive water flow resistance and slow filtration speed. This favorable porosity distribution ensures that water flows relatively evenly through the filter media layer, allowing each glass filter media particle to fully participate in the filtration of high-temperature produced water, thus improving overall filtration efficiency.

[0040] A suitable bulk density is beneficial for subsequent maintenance operations such as backwashing. When it is necessary to backwash the filter media to remove attached impurities and restore filtration performance, the filter media layer within this bulk density range can achieve a better water or air flow effect under the backwashing force such as water or airflow impact. It is easier to thoroughly wash away the impurities trapped between the filter media particles, while avoiding the filter media being too loose and easily dispersed or too dense and difficult to wash clean, thus facilitating the maintenance of good filtration status of the filter media.

[0041] In another preferred embodiment, the glass filter media can be one or more layers. When multiple layers are used, the particle size of the glass filter media is the same in each layer and decreases with each layer from the second end to the first end of the filter cylinder. During filtration, the finest particle size filter media at the first end of the filter cylinder directly undertakes the task of fine filtration of the high-temperature produced water, while the remaining layers of filter media with progressively larger particle sizes play a role in supporting and stabilizing the structure.

[0042] The coarser filter media layers form a stable foundation for the finest filter media, ensuring that it maintains a relatively fixed position and good arrangement while withstanding the continuous impact of water flow and intercepting a large number of fine impurities. This guarantees that it can continuously, stably, and efficiently perform its filtration function, reliably intercepting tiny impurities in the water and achieving a high-precision filtration effect for high-temperature extracted water.

[0043] Simultaneously, during backwashing, water or air is introduced from the second end of the filter cartridge. Since the filter media is filled layer by layer from the second end to the first end with decreasing particle size, backwashing starting from the second end means the water or airflow first contacts the larger particle layer. The particle size decreases progressively, and the gaps between the particles also decrease, effectively dispersing the water or airflow layer by layer. This allows the backwashing medium to enter the filter cartridge smoothly, and as backwashing progresses, it more easily removes impurities attached to the filter media particles and accumulated between them. This method avoids the significant resistance from the small-particle filter layer at the beginning, greatly reducing the overall resistance during backwashing, improving backwashing efficiency, and ensuring thorough removal of impurities from the filter media in a shorter time.

[0044] Example 2:

[0045] Please see Figure 1 , Figure 2 and Figure 5 .

[0046] This embodiment provides a filtration device for high-temperature produced water in offshore oil fields. Based on the structure of Embodiment 1, the structure of the first and second water distribution plates is improved and described in detail. Both the first and second water distribution plates are made of stainless steel microporous filter discs or stainless steel multilayer sintered mesh filter discs, and their thickness ranges from 1 to 8 mm. In one specific embodiment, the thickness of the water distribution plate is 1 mm. In other specific embodiments, the thickness of the water distribution plate can also be 4 mm, 5.2 mm, 8 mm, etc.

[0047] Microporous filter discs have numerous tiny, relatively evenly distributed pores, which can finely disperse the incoming water into many small streams, allowing the water to enter the glass filter media layer inside the filter cartridge evenly and avoiding localized areas of excessive or insufficient water flow. Similarly, stainless steel multi-layer sintered mesh filter discs are made by stacking and sintering multiple layers of mesh with different pore sizes and weave structures, forming an ordered and complex pore structure within. This structure also effectively disperses and evenly distributes the water flow, ensuring a smooth and uniform flow through the entire filtration device and optimizing the filtration effect.

[0048] In addition to distributing water, these two types of water distribution plates can also intercept some large particles of impurities in the filtered water. For example, impurity particles larger than the micropores or multi-layer sintered mesh pores will be intercepted when water flows through the water distribution plate, preventing these large particles from directly entering the filter media layer and causing premature clogging. This reduces the filtration burden on the subsequent glass filter media and helps maintain the efficient operation of the entire filtration device for a longer period of time.

[0049] Meanwhile, stainless steel itself possesses high mechanical strength, allowing the upper and lower water distribution plates to withstand pressure from filtered water flow, backwash water flow, and backwash airflow while simultaneously supporting the internal glass filter media. Furthermore, it maintains structural integrity and shape stability even under equipment vibration and installation stress.

[0050] Furthermore, in the high-temperature produced water filtration environment of offshore oil fields, the produced water often contains various corrosive components, such as salts, minerals, and some acidic or alkaline substances. Stainless steel microporous filter discs or multi-layer sintered mesh filter discs have excellent corrosion resistance, can be in contact with high-temperature produced water for a long time without being corroded, avoid problems such as uneven water distribution and poor filtration effect caused by material corrosion damage, and effectively extend the service life of the entire filtration device.

[0051] By controlling the thickness within the range of 1-8mm, the water distribution plate is not too thin, which would prevent it from failing to effectively distribute water evenly and intercept impurities appropriately. At the same time, it avoids the water flow resistance caused by an excessively thick water distribution plate, which would affect the filtration speed and efficiency of the entire filtration device.

[0052] In a further preferred embodiment, the first and second water distribution plates can be made of stainless steel of SS304, SS316, 2205 or 2507, which is compatible with the water quality to be filtered.

[0053] Among them, SS304 stainless steel is more versatile and exhibits a certain degree of corrosion resistance when dealing with water containing salts and minerals, while also being cost-effective. SS316 stainless steel contains molybdenum, making it even more corrosion-resistant. When the water to be filtered contains higher concentrations of salts, chloride ions, or other highly corrosive components, SS316 stainless steel water distribution plates can better withstand the erosion of these corrosive substances, effectively preventing damage such as rust and perforation. Furthermore, it maintains stable performance regardless of fluctuations in the pH of the water.

[0054] 2205 duplex stainless steel, composed of both austenitic and ferritic phases, combines the advantages of both SS304 and SS316. In terms of corrosion resistance, it exhibits strong resistance to corrosive media such as chloride ions. In the high-salinity, high-chloride-concentration produced water environment of offshore oil fields, it effectively prevents corrosion, ensuring the durability of the water distribution plate. Simultaneously, its duplex structure provides excellent resistance to stress corrosion cracking. Even under stress from water flow pressure and equipment vibration during filtration operation, it is less prone to cracking due to stress concentration, further ensuring the stable operation of the water distribution plate under complex conditions.

[0055] 2507 Super Duplex Stainless Steel boasts a higher content of alloying elements such as chromium, molybdenum, and nickel, giving it exceptional corrosion resistance. It exhibits outstanding tolerance to various extreme corrosive substances that may be present in high-temperature produced water from offshore oil fields, including high concentrations of acidic and alkaline components, as well as high salinity and chloride ion content, ensuring the water distribution plate is protected from corrosion damage to the maximum extent. Furthermore, it possesses good wear resistance, maintaining surface smoothness and structural integrity even under long-term scouring by water carrying impurities and the repeated action of water and air flow during backwashing. This ensures excellent water distribution and filtration performance, making it particularly suitable for high-temperature produced water filtration scenarios in offshore oil fields where water distribution plate performance requirements are extremely high and water quality conditions are extremely harsh.

[0056] In another preferred embodiment, the pore sizes of both the first and second water distribution plates are smaller than the particle size of their respective adjacent glass filter media. When the pore size of the water distribution plate is smaller than the particle size of the adjacent glass filter media, it can reliably intercept the flow, preventing the glass filter media from entering the inlet / outlet pipes or other components through the pores of the water distribution plate during the filtration process due to water flow impact, equipment vibration, or other external forces. This ensures that the filter media is always in a suitable position within the filter cartridge, maintaining the stability of the internal structure of the filtration device.

[0057] For example, when filtered water flows out from the second distribution plate, the smaller aperture prevents the filter media from flowing out with the water. During backwashing, when water flows out along the first distribution plate, if the aperture of the first distribution plate is too large, the glass filter media may be washed out with the water flow. This not only leads to the loss of filter media and damages the structural integrity of the filter media layer inside the filter cartridge, but may also clog the pipeline and affect the normal operation of the entire filtration device.

[0058] The fact that the pore size of the water distribution plate is smaller than that of the adjacent glass filter media gives it a certain ability to intercept impurities. When the water to be filtered flows through the water distribution plate, impurity particles larger than the pore size of the water distribution plate are directly trapped on the surface of the water distribution plate or on the side near the water distribution plate. This prevents these large particles from directly entering the glass filter media layer, avoiding premature clogging of the gaps between the filter media and reducing the burden on the glass filter media for subsequent filtration.

[0059] In another preferred embodiment, the first water distribution plate is connected to the first end of the filter cylinder via a second flange 41 and a flange integrated on the first water distribution plate, and the second water distribution plate is connected to the second end of the filter cylinder via a third flange 42 and a flange integrated on the second water distribution plate. This allows operators to quickly complete the connection operation by simply aligning the corresponding flanges of the first water distribution plate, the second water distribution plate, and the filter cylinder, inserting bolts, and tightening nuts during the assembly of the filter device, thus improving the assembly efficiency of the entire filter device. Especially in the field installation environment of offshore oil fields, this convenient installation method helps to reduce the equipment installation cycle, lower labor costs, and mitigate the potential risks associated with excessively long installation times.

[0060] In addition, after the filtration device has been running for a period of time, it is necessary to inspect, repair, or replace components such as the water distribution plate and the filter media inside the filter cartridge. The flange connection allows the water distribution plate to be easily removed from the filter cartridge, making it easy for maintenance personnel to access the internal structure, clean the water distribution plate, check for damage, or replenish or replace the glass filter media inside the filter cartridge.

[0061] Flange connections, secured with multiple evenly distributed bolts, create a robust connection between the water distribution plate and the filter cartridge. In offshore oilfield environments, filtration systems may be subjected to external forces such as wave impacts and equipment vibrations. Flange connections can withstand these forces, ensuring that the water distribution plate and filter cartridge do not loosen or shift, thus maintaining the stability of the entire internal structure of the filtration system.

[0062] In a further preferred embodiment, the second flange can be located at the first end of the filter cylinder or on the first water distribution plate, and the third flange can be located at the second end of the filter cylinder or on the second water distribution plate. This flexible flange arrangement improves the flexibility of the device, allowing it to adapt to different installation scenarios.

[0063] Example 3:

[0064] Please see Figures 1-5 .

[0065] This embodiment provides a filtration device for high-temperature produced water in offshore oil fields, further improving the structure of the filtration device in Embodiment 1 or Embodiment 2. Adaptive first end caps 2 and second end caps 6 are respectively provided at the first and second ends of the filter cylinder, wherein the first end cap has a first opening 1, and the second end cap has a second opening 7. During filtration, the water to be filtered passes sequentially through the first water distribution plate, the glass filter media, and the second water distribution plate along the first opening, and is discharged from the second opening. During backwashing, air intake or backwash water passes sequentially through the second water distribution plate, the glass filter media, and the first water distribution plate from the second opening, and is discharged from the first opening.

[0066] During filtration, a first inlet is provided on the first end cap and a second inlet on the second end cap, clearly defining the flow direction of the water to be filtered and the air intake or backwash water, thus standardizing the water flow path. During backwashing, the same predetermined and reasonable route is followed, avoiding disorderly flow of water and air, ensuring that both filtration and backwashing operations are carried out efficiently and accurately.

[0067] The inlet and outlet water and air channels are centrally located on the end caps at both ends of the filter cartridge, facilitating centralized control and management of the entire filtration system's operation. For example, an inlet water pipe can be easily connected at the inlet, and parameters such as the flow rate and pressure of the filtered water can be controlled via appropriate valves and other equipment. Similarly, the filtered water can be collected and its quality monitored at the outlet. During backwashing, simply connect the backwash water or air source to the corresponding inlet and follow the pre-set operating procedure. This reduces operational complexity, improves operational efficiency, and facilitates the timely detection and handling of potential problems such as blockages and leaks.

[0068] The end cap fits tightly with the filter cartridge, and the opening serves as the sole designated channel for water and air flow, enhancing the overall sealing of the filtration unit. This effectively prevents leakage of filtered water, intake air, or backwash water from unexpected locations. In offshore oilfield environments, leak prevention is particularly crucial, affecting not only the efficient use of water resources and the avoidance of environmental pollution but also the normal operating efficiency of the filtration unit. Good sealing ensures that both the filtration and backwashing processes can proceed in a relatively enclosed environment, guaranteeing the reliability of the entire system.

[0069] The first and second end caps effectively protect the internal components of the filter cartridge, such as the water distribution plate and glass filter media. They prevent external dust, impurities, and potential physical impacts from affecting the internal components, reducing the likelihood of damage or performance degradation caused by external factors and extending the service life of each component. Placing the opening on the end caps makes the overall structure of the filter cartridge more compact and orderly. In the limited space of offshore oil fields, this allows for more rational equipment layout, improves space utilization, and facilitates connection and coordinated operation with other related water treatment equipment and pipelines, meeting the space planning requirements of offshore operations.

[0070] In a further preferred embodiment, the first end cap is connected to the first water distribution plate via a first flange 21 and a flange integrated into the first water distribution plate, and the second end cap is connected to the second water distribution plate via a fourth flange 61 and a flange integrated into the second water distribution plate. The flange connection simplifies the installation of the end cap and the water distribution plate. Furthermore, the flange connection typically uses a suitable gasket; during bolt tightening, the gasket is compressed, effectively filling the minute gaps between the end cap and the water distribution plate, resulting in a good seal.

[0071] In a further preferred embodiment, the first flange can be disposed on the first end cover or on the first water distribution plate, and the fourth flange can be disposed on the second end cover or on the second water distribution plate, thereby providing a more flexible installation scheme for the device.

[0072] In another preferred embodiment, the first end cap and the first water distribution plate form a first cavity, and the second end cap and the second water distribution plate form a second cavity. When the water to be filtered enters the filtration device from the outside, the first cavity acts as a buffer, adjusting the unstable water flow state caused by factors such as pipe pressure and water flow velocity. This prevents the water flow from being too rapid or turbulent and directly impacting the first water distribution plate, allowing the water flow to pass through the first water distribution plate more evenly and smoothly into the glass filter media layer inside the filter cartridge. Furthermore, the first cavity prevents large particles or foreign objects that may be carried in the water to be filtered from directly impacting the first water distribution plate or rapidly entering the filter cartridge, reducing the risk of impact and wear on the first water distribution plate and subsequent glass filter media. Similarly, when the filtered water reaches the second cavity, the second cavity provides space for further buffering and collection of the water flow, ensuring the stability of the water flow throughout the filtration process. Similarly, during backwashing, the second cavity also buffers the backwash water or gas and collects the water and gas.

[0073] When faced with different operating conditions, such as significant fluctuations in the flow rate and pressure of the water to be filtered, or changes in water and air pressure during backwashing, these two chambers help the filtration device better adapt to these situations. By buffering and regulating the state of water and air flow, the internal components of the filtration device can operate in a relatively stable working environment, reducing the adverse effects of changes in external conditions on the filtration effect. This improves the overall adaptability of the filtration system to complex operating conditions, ensuring that it can continuously and efficiently complete the filtration and treatment of high-temperature produced water from offshore oil fields.

[0074] It should be understood that the embodiments are for illustrative purposes only and are not intended to limit the scope of the present invention. Furthermore, it should be understood that after reading the teachings of this invention, those skilled in the art can make various alterations or modifications to the invention, and these equivalent forms also fall within the scope defined by the appended claims.

Claims

1. A filtration device for high-temperature produced water in offshore oil fields, characterized in that, include: A filter cartridge, wherein the filter cartridge is filled with glass filter media; The first water distribution plate and the second water distribution plate are respectively disposed at the first end and the second end of the filter cylinder and are respectively connected to the inside of the filter cylinder, and the first water distribution plate and the second water distribution plate press the glass filter material. The water to be filtered flows through the first water distribution plate, is filtered by the glass filter material, and then flows out along the second water distribution plate.

2. The filtration device according to claim 1, characterized in that, The height of the filter cartridge is 10-20cm, and the filling height of the glass filter material is not higher than the height of the filter cartridge.

3. The filtration device according to claim 1, characterized in that, The glass filter media consists of uniform glass particles with a particle size ranging from 0.2 to 8 mm and a particle density ranging from (2.5 ± 0.2) × 10⁻⁶. 3 kg / m³, bulk density range is (1.2~1.4)×10 3 kg / m³.

4. The filtration device according to claim 3, characterized in that, The glass filter media comprises two or more layers. Along the direction from the second end to the first end of the filter cylinder, the particle size of the glass filter media is the same in the same layer and decreases with each layer.

5. The filtration device according to claim 1, characterized in that, Both the first water distribution plate and the second water distribution plate are either stainless steel microporous filter discs or stainless steel multilayer sintered mesh filter discs, and their thickness ranges from 1 to 8 mm.

6. The filtration device according to claim 5, characterized in that, The pore sizes of the first water distribution plate and the second water distribution plate are both smaller than the particle size of their respective adjacent glass filter media.

7. The filtration device according to claim 1, characterized in that, The first water distribution plate is connected to the first end of the filter cylinder via a flange, and the second water distribution plate is connected to the second end of the filter cylinder via a flange.

8. The filtration device according to any one of claims 1 to 7, characterized in that, The first end and the second end of the filter cartridge are respectively provided with a first end cap and a second end cap, the first end cap having a first opening and the second end cap having a second opening. The water to be filtered passes sequentially through the first water distribution plate, the glass filter media, and the second water distribution plate along the first inlet, and is discharged from the second inlet; the air intake or backwash water passes sequentially through the second water distribution plate, the glass filter media, and the first water distribution plate from the second inlet, and is discharged from the first inlet.

9. The filtration device according to claim 8, characterized in that, The first end cap is connected to the first water distribution plate via a flange, and the second end cap is connected to the second water distribution plate via a flange.

10. The filtration device according to claim 9, characterized in that, The first end cap and the first water distribution plate form a first cavity, and the second end cap and the second water distribution plate form a second cavity.

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