A flocculent suspended matter treatment system for oilfield produced water

Abstract

The present invention discloses a flocculent suspended solids treatment system for oilfield produced water, comprising a water tank and a triggering device, wherein a primary filter screen and a secondary filter screen are fixed inside the water tank, wherein the primary filter screen is located inside the secondary filter screen so that a receiving chamber is formed between the primary filter screen and the secondary filter screen, wherein a motor is fixed to the outer wall of the lower end of the water tank, wherein a cleaning rod is fixedly connected to the output shaft of the motor, wherein the upper end of the cleaning rod extends into the receiving chamber, wherein an inner cavity is defined inside the cleaning rod, wherein a water passage plate that can slide up and down is provided inside the inner cavity, wherein the inner cavity is hollowed out for storing water, and a brush plate and a nozzle for brushing the primary filter screen and the secondary filter screen are fixedly mounted on the water passage plate. The system solves the technical problems of low filtration efficiency and difficulty in cleaning of current filtering devices in the related art, and achieves efficient cleaning of flocculent suspended solids.

Description

Technical Field

[0001] The invention belongs to the technical field of oilfield produced water treatment, and in particular relates to a flocculent suspended matter treatment system for oilfield produced water. Background Art

[0002] Oilfield produced water contains flocculent suspended matter, which tends to aggregate and affect filtration. Currently, there are filtration devices specifically designed to filter flocculent suspended matter on the market, which generally use a two-stage filtration process. However, flocculent suspended matter is more likely to aggregate than other impurities, making it more likely to cause filter blockage.

[0003] In the related art, most of the current filtering devices are prone to filter clogging after long-term use. If they are not cleaned for a long time, impurities will accumulate on the filter, causing it to be unable to filter water, thereby causing water to accumulate in the filter, which will easily cause the filter to be damaged or directly torn due to being too heavy. At the same time, if they are not cleaned for a long time, impurities will accumulate on the filter and it will be difficult to clean. However, it needs to be disassembled for cleaning, which is very troublesome. Moreover, the device needs to stop working after disassembly. The suspension of the filtering device will affect the production of the production equipment that discharges sewage, thereby affecting the filtering function. Summary of the Invention

[0004] In order to solve at least one of the problems mentioned in the above background technology, the object of the present invention is to provide a system for treating flocculent suspended matter in oilfield produced water.

[0005] The present invention is achieved through the following technical solutions:

[0006] The cleaning rod has a plurality of filter screens, a plurality of filter screens, and a plurality of filter screens connected thereto. The plurality of filter screens are connected to the cleaning rod by a plurality of channels. The plurality of filter screens are connected to the cleaning rod by a plurality of channels. The plurality of filter screens are connected to the cleaning rod by a plurality of channels.

[0007] In one embodiment, the cleaning rod is U-shaped, with its bottom fixedly connected to the output shaft of the motor, and the two side rods extending into the accommodating cavity. An inner cavity is opened inside each of the side rods, and the nozzle hole and brush plate groove are opened on both sides of each side rod.

[0008] In one embodiment, the trigger device includes a sliding bin fixedly connected to the lower end of the first-level filter screen, a slide is slidably connected in the sliding bin, the lower surface of the slide is fixedly connected to a fixing rod, the lower end of the fixing rod is fixedly connected to a wedge block 2, the bottom upper surface of the cleaning rod is provided with a slot for limiting the wedge block 2, the wedge block 2 is slidably connected in the slot, and the bottom of the cleaning rod is connected to a push rod that can slide along the bottom of the cleaning rod, and when the wedge block 2 moves downward, the push rod is pushed to move in a direction away from the wedge block 2; a connecting rod is hinged on the water-passing plate, and a support rod is hinged on the connecting rod, and the end of the push rod away from the wedge block 2 is fixedly connected to the wedge block 1, and when the push rod moves in a direction away from the wedge block 2, the wedge block 1 pushes the support rod to move upward.

[0009] In one embodiment, the trigger device also includes an unlocking device, which includes a fixed cylinder fixedly connected to the outer wall of the sliding bin, a limit clamp slidably connected inside the fixed cylinder, and a spring that can reset the limit clamp is provided inside the fixed cylinder.

[0010] The water supply mechanism comprises a through slot provided at the bottom of the cleaning rod, a side surface of the wedge block close to the through slot is fixedly connected to a piston cylinder, the piston cylinder is slidably connected in the through slot, a push rod is slidably connected to the piston cylinder, a spring is provided in the piston cylinder to reset the push rod, a hemispherical top is fixedly connected to the lower surface of the inner wall of the water tank, the hemispherical top is used to push the push rod into the piston cylinder when the cleaning rod rotates, a one-way valve is provided on one end of the piston cylinder close to the hemispherical top, a piston head is provided at one end of the push rod located in the piston cylinder, and the one-way valve is provided on the piston head, the flow direction of the one-way valve provided on the piston cylinder is from the outside of the piston cylinder to the inside, and the flow direction of the one-way valve provided on the push rod is from the side close to the hemispherical top to the side away from the hemispherical top, the position where the one-way valve is provided on the piston cylinder is connected to a water suction hose, and the piston cylinder and the water passing plate are connected by a connecting pipe.

[0011] In one embodiment, a reset device is further included for resetting the trigger device. The reset device includes a limit groove provided on the side rod of the cleaning rod. A water accumulation plate is slidably connected in the limit groove and can slide up and down along the limit groove. The water accumulation plate is fixedly connected to the support rod, and a water outlet hole is provided on the water accumulation plate.

[0012] In one embodiment, a salvaging device for salvaging suspended matter in the first-stage filter screen is further included. The salvaging device includes an auger fixedly connected to wedge block 2, a lifting rod fixedly connected to the water tank and extending into the first-stage filter screen, and the auger is located inside the lifting rod.

[0013] In one embodiment, the water tank is a closed cylindrical water tank, the top of the water tank is connected to a drain outlet that allows sewage to flow into the primary filter screen, the lower end is connected to a sewage outlet that allows sewage between the primary filter screen and the secondary filter screen to flow out, and the side wall is provided with a water inlet that can discharge the filtered water, and the water inlet, drain outlet and sewage outlet are all provided with electromagnetic valves.

[0014] In one embodiment, two groups of the nozzle holes, brush plate grooves, brush plates, nozzles, and water passage plates are symmetrically arranged in the inner cavity of the cleaning rod.

[0015] The beneficial effects of the present invention are as follows: the oilfield produced water flocculent suspended solids treatment system of the present invention solves the technical problems of low filtration efficiency and difficulty in cleaning of the current filtration devices in the existing related technologies, and achieves the following beneficial effects:

[0016] 1. When cleaning is needed, the trigger device extends the brush plate and nozzle out of the cleaning rod. This ensures that when cleaning is not in progress, the sewage flowing out of the primary filter will not continuously impact the brush plate and nozzle for a long time, thereby ensuring that the nozzle of the nozzle is not easily clogged by impurities in the sewage, causing it to malfunction. At the same time, it reduces the amount of impurities sticking to the brush plate, which may cause the cleaning function to decline. When the brush plate and nozzle are retracted into the nozzle hole and brush plate groove, the nozzle hole and brush plate groove can scrape off impurities on the brush plate and nozzle. The cleaning rod is then driven by the motor to rotate, and when the cleaning rod rotates, it can drive the nozzle and brush plate to work, thereby cleaning the entire primary filter and secondary filter for a more complete cleaning.

[0017] 2. The function of triggering is realized by the accumulated water generated when the first-level filter is blocked. No separate power device is required. Not only is the structure simple, but it can also judge whether to clean according to whether it is blocked, instead of cleaning in real time, thereby reducing the cost of use;

[0018] 3. The filtered water can be directly used through the water supply mechanism to achieve clean filtration, energy saving, environmental protection and reduce waste;

[0019] 4. The unlocking mechanism allows the trigger mechanism to activate only after the filtering function has decreased to a certain level, eliminating continuous operation or frequent triggering, thus reducing operating costs. The spring rate can be adjusted according to actual needs to accommodate different requirements. Furthermore, the slide plate can only be reset when the primary filter's filtering function has recovered to a certain level, draining a large amount of water and providing sufficient gravity for the water accumulation plate. This ensures that the cleaning function will only reset when the primary filter is fully clean, ensuring effective cleaning. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] In order to more clearly illustrate the specific embodiments of the present invention or the technical solutions in the prior art, the following briefly introduces the drawings required for use in the specific embodiments or the description of the prior art. Obviously, the drawings described below are some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.

[0021] Figure 1 2 is a schematic diagram of the overall structure of a system for treating flocculent suspended matter in oilfield produced water according to an embodiment of the present invention;

[0022] Figure 2 An internal schematic diagram of a system for treating flocculent suspended matter in oilfield produced water according to an embodiment of the present invention;

[0023] Figure 3 An enlarged schematic diagram of the sliding bin portion of the internal structure of the oilfield produced water flocculent suspended solids treatment system according to an embodiment of the present invention;

[0024] Figure 4 For the present invention Figure 3 A magnified view of the structure at center A;

[0025] Figure 5 A schematic cross-sectional structural diagram of a through-channel portion of a system for treating flocculent suspended matter in oilfield produced water according to an embodiment of the present invention;

[0026] Figure 6 For the present invention Figure 5 Schematic diagram of the structure at B in the middle;

[0027] Figure 7 For the present invention Figure 6 Schematic diagram at C in the middle;

[0028] Figure 8 A schematic diagram of the structure of the inner cavity of the oilfield produced water flocculent suspended solids treatment system according to an embodiment of the present invention;

[0029] Figure 9 A schematic structural diagram of a brush plate and a nozzle of a system for treating flocculent suspended matter in oilfield produced water according to an embodiment of the present invention;

[0030] Figure 10 Schematic diagram of the connection structure of the connecting pipes of the oilfield produced water flocculent suspended matter treatment system according to an embodiment of the present invention.

[0031] Among them, 01, water tank; 02, water inlet; 03, sewage outlet; 04, motor; 05, drain outlet; 06, lifting rod; 07, auger; 08, cleaning rod; 11, primary filter; 12, secondary filter; 13, nozzle hole; 14, brush plate groove; 15, slide plate; 16, slide bin; 17, water accumulation plate; 18, support rod; 19, wedge block 1; 20, push rod; 21, hemispherical top; 22, water suction hose; 23, wedge block 2; 24, card slot; 25, water outlet; 26, fixing rod; 27, fixing cylinder; 28, limit clamp; 29, through slot; 30, piston cylinder; 31, push rod; 32, one-way valve; 33, water flow plate; 34, connecting rod; 35, inner cavity; 36, brush plate; 37, nozzle; 38, connecting pipe. DETAILED DESCRIPTION

[0032] The technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. The components of the embodiments of the present invention generally described and shown in the drawings herein can be arranged and designed in various different configurations. Therefore, the following detailed description of the embodiments of the present invention provided in the drawings is not intended to limit the scope of the claimed invention, but merely represents selected embodiments of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without making creative work are within the scope of protection of the present invention.

[0033] In the description of the embodiments of the present invention, it should be understood that the terms "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise" and the like to indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the embodiments of the present invention and simplifying the description, rather than indicating or implying that the referred device or element must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as limiting the embodiments of the present invention.

[0034] Below, refer to Figures 1-10 The oilfield produced water flocculent suspended matter treatment system according to the embodiment of the present invention will be described in detail.

[0035] like Figure 1-10As shown, the oilfield produced water flocculent suspended solids treatment system provided by an embodiment of the present invention includes a water tank 01 and a trigger device. A primary filter screen 11 and a secondary filter screen 12 are fixed inside the water tank 01. The primary filter screen 11 is located inside the secondary filter screen 12 so that a receiving chamber is formed between the primary filter screen 11 and the secondary filter screen 12. A motor 04 is fixed to the outer wall of the lower end of the water tank 01. A cleaning rod 08 is fixedly connected to the output shaft of the motor 04. The upper end of the cleaning rod 08 extends into the receiving chamber; an inner cavity 35 is opened inside the cleaning rod 08, and a water-passing plate 3 that can slide up and down is provided in the inner cavity 35. 3. The interior of the water-passing plate is hollowed out for storing water. A brush plate 36 and a nozzle 37 for brushing the primary filter 11 and the secondary filter 12 are fixedly mounted on the water-passing plate 33. The nozzle 37 is connected to the interior of the water-passing plate 33 for spraying water in the water-passing plate 33. A nozzle hole 13 and a brush plate groove 14 are provided on the cleaning rod 08. The nozzle 37 and the brush plate 36 are respectively arranged in the nozzle hole 13 and the brush plate groove 14. The trigger device is used to trigger the water-passing plate 33 to drive the brush plate 36 and the nozzle 37 to move from the nozzle hole 13 and the brush plate groove 14 when cleaning the primary filter 11 and the secondary filter 12.

[0036] In this embodiment, the cleaning rod 08 is U-shaped, with its bottom fixedly connected to the output shaft of the motor 04. The two side rods extend into the accommodating cavity. Each side rod defines an inner cavity 35, and each side of the side rod defines the nozzle holes 13 and brush plate grooves 14. Two sets of nozzle holes 13, brush plate grooves 14, brush plates 36, nozzles 37, and water passage plates 33 are symmetrically arranged within the inner cavity 35 of the cleaning rod 08.

[0037] For example, the nozzle holes 13, brush plate grooves 14, brush plates 36, nozzles 37, and water-passing plates 33 should be symmetrically arranged in two groups within the inner cavity 35 of the cleaning rod 08. The cleaning rod 08 is U-shaped, and both ends of its upper end are provided with symmetrically arranged brush plates 36 and nozzle 37 working groups, so that the secondary filter 12 can be cleaned while the primary filter 11 is being cleaned. Moreover, the two ends of the cleaning rod 08 are provided with working groups to ensure that the rotation stability of the cleaning rod 08 is improved when the cleaning rod 08 rotates during the cleaning work, and both ends can clean at the same time, thereby improving the efficiency and effect of cleaning. In addition, the width of the two ends of the upper end of the cleaning rod 08 should be less than the distance between the primary filter 11 and the secondary filter 12, to ensure that the cleaning rod 08 does not contact the primary filter 11 and the secondary filter 12, thereby ensuring that the cleaning rod 08 does not scratch the primary filter 11 and the secondary filter 12 when it rotates. After the sewage flows into the water tank 01, it is filtered by the primary filter 11 and then flows between the primary filter 11 and the secondary filter 12, and then filtered by the secondary filter 12 to complete the filtration on both sides. Since it is mainly used to filter flocculent floating objects, it is easy to cause the primary filter 11 and the secondary filter 12 to be blocked after long-term use, thereby reducing the filtration performance, especially the primary filter 11. The sewage will first be discharged into the primary filter 11 for primary filtration, which makes the primary filter 11 more prone to clogging. When cleaning is required, the trigger device will work, causing the brush plate 36 and the nozzle 37 to extend from the nozzle hole 13 and the brush plate groove 14 respectively. The two brush plates 36 in the inner cavity 35 will respectively rest on the primary filter 11 and the secondary filter 12. The nozzles 37 on both sides will extend from the nozzle hole 13 and will not rest on the primary filter 11 and the secondary filter 12. Then the nozzle 37 opens to spray water, and the water flow will impact the primary filter 11 and the secondary filter 12. The motor 04 will drive the cleaning rod 08 to rotate in the water tank 01 through the output shaft. The rotation of the cleaning rod 08 will drive the brush plate 36 and the nozzle 37 to rotate at the same time. The rotation of the brush plate 36 will scrape off the impurities filtered on the outer wall of the primary filter 11 and the inner wall of the secondary filter 12. The water flow impacted by the nozzle 37 can promote the separation of impurities on the secondary filter 12 and the primary filter 11. At the same time, the water flow impacted by the nozzle 37 close to the side of the primary filter 11 will not only impact the impurities on the outer wall of the primary filter 11, but also impact the impurities stuck to the inner wall of the primary filter 11, causing them to fall into the middle and lower end of the primary filter 11.

[0038] When cleaning is required, the trigger device extends the brush plate 36 and nozzle 37 out of the cleaning rod 08. This ensures that when cleaning is not in progress, the sewage flowing through the primary filter 11 does not continuously impact the brush plate 36 and nozzle 37 for a long time, thereby ensuring that the nozzle of the nozzle 37 is not easily clogged by impurities in the sewage, thereby preventing it from being blocked and causing it to malfunction. At the same time, it also reduces the amount of impurities adhering to the brush plate 36, which would otherwise reduce the cleaning function. When the brush plate 36 and nozzle 37 are retracted into the nozzle hole 13 and brush plate groove 14, the nozzle hole 13 and brush plate groove 14 can scrape impurities off the brush plate 36 and nozzle 37. The motor 04 then drives the cleaning rod 08 to rotate. When the cleaning rod 08 rotates, it drives the nozzle 37 and brush plate 36 to operate, thereby cleaning the entire primary filter 11 and secondary filter 12 more completely. Because the cleaning rod 08 is rod-shaped, it does not affect the filtering function of the primary filter 11 and secondary filter 12 during cleaning.

[0039] In one embodiment, the trigger device includes a sliding bin 16 fixedly connected to the lower end of the first-stage filter 11, and a slide 15 is slidably connected in the sliding bin 16. The lower surface of the slide 15 is fixedly connected to a fixing rod 26, and the lower end of the fixing rod 26 is fixedly connected to a wedge 23. The upper surface of the bottom of the cleaning rod 08 is provided with a slot 24 for limiting the wedge 23, and the wedge 23 is slidably connected in the slot 24. The bottom of the cleaning rod 08 is connected to a push rod 20 that can slide along the bottom of the cleaning rod 08. When the wedge 23 moves downward, the push rod 20 is pushed to move in the direction away from the wedge 23; a connecting rod 34 is hinged on the water-passing plate 33, and a support rod 18 is hinged on the connecting rod 34. The end of the push rod 20 away from the wedge 23 is fixedly connected to the wedge 19. When the push rod 20 moves in the direction away from the wedge 23, the wedge 19 pushes the support rod 18 to move upward.

[0040] For example, due to the decline in filtering function, the first-level filter 11 will gradually become blocked from the lower end to the upper end, causing water to accumulate in the first-level filter 11. The lower end of the first-level filter 11 will gradually lose its filtering function upward, so when the first-level filter 11 is too heavy, it is easy to cause breakage and damage, so it needs to be cleaned. When the filtration function is degraded, the trigger mechanism activates. The weight of the water in the primary filter 11 causes the slide 15 to slide downward within the slide compartment 16. The slide 15 pushes the fixed rod 26, which drives the wedge 23 downward. The wedge 23 pushes the push rod 20 on the cleaning rod 08 away from the wedge 23, which in turn pushes the support rod 18 upward via the wedge 19. When the support rod 18 moves upward, it pushes the water plate 33 via the connecting rod 34. Because the upper end of the water plate 33 abuts the upper end of the inner wall of the inner cavity 35, the push of the connecting rod 34 only causes the water plate 33 to move toward the nozzle hole 13, thereby allowing the brush plate 36 and the nozzle 37 to move out of the brush plate groove 14 and the nozzle hole 13 respectively. After being cleaned by the nozzle 37 and the brush plate 36, the debris on the primary filter 11 is gradually cleared, and the water accumulated in the primary filter 11 quickly flows out of the primary filter 11. The triggering function is achieved by the accumulated water generated when the first-level filter 11 is blocked. No separate power device is required. Not only is the structure simple, but it can also determine whether to perform cleaning based on whether it is blocked, without performing cleaning in real time, thereby reducing the cost of use.

[0041] Furthermore, the trigger device also includes an unlocking device, which includes a fixed cylinder 27 fixedly connected to the outer wall of the sliding bin 16, a limit clamp 28 slidably connected inside the fixed cylinder 27, and a spring that can reset the limit clamp 28 is provided inside the fixed cylinder 27.

[0042] For example, when the slide 15 descends, it is first stopped by the stopper 28, preventing it from descending immediately. Consequently, cleaning will not begin immediately upon filtration blockage. Instead, the system will wait until filtration performance declines to a certain level, allowing the accumulated water to cause the slide 15 to push the stopper 28 into the fixed cylinder 27. This prevents the trigger mechanism from activating only after filtration performance declines to a certain level, rather than requiring continuous operation or frequent triggering, thus reducing operating costs. The spring rate can be adjusted based on actual usage to accommodate different needs.

[0043] Furthermore, it also includes a water supply mechanism, which includes a through groove 29 opened at the bottom of the cleaning rod 08, and a piston cylinder 30 is fixedly connected to the side surface of the wedge block 19 close to the through groove 29. The piston cylinder 30 is slidably connected in the through groove 29, and a push rod 31 is slidably connected to the piston cylinder 30. A spring that can reset the push rod 31 is provided in the piston cylinder 30, and a hemispherical top 21 is fixedly connected to the lower surface of the inner wall of the water tank 01. The hemispherical top 21 is used to push the push rod 31 into the piston cylinder 30 when the push rod 31 rotates with the cleaning rod 08. The piston cylinder 30 is close to the hemispherical top 21. A one-way valve 32 is provided on one end of the piston cylinder 30, and a piston head is provided at one end of the push rod 31 located in the piston cylinder 30, which is slidably connected to the piston cylinder 30 and the piston head is provided with a one-way valve 32. The flow direction of the one-way valve 32 provided on the piston cylinder 30 is from the outside of the piston cylinder 30 to the inside, and the flow direction of the one-way valve 32 provided on the push rod 31 is from the side close to the hemispherical top 21 to the side away from the hemispherical top 21. The position where the one-way valve 32 is provided on the piston cylinder 30 is connected to the water suction hose 22, and the piston cylinder 30 and the water-passing plate 33 are connected through a connecting pipe 38.

[0044] For example, when cleaning rod 08 rotates, cleaning rod 08 also drives wedge 19 to rotate simultaneously, which in turn drives piston cylinder 30 to rotate simultaneously, which in turn drives push rod 31 to rotate simultaneously. Since the trigger mechanism causes wedge 19 to move away from wedge 23 when in operation, when push rod 31 rotates to the position of hemispherical top 21, hemispherical top 21 can push push rod 31 to slide upward, thereby pushing water in piston cylinder 30 into water passage plate 33 through connecting pipe 38, thereby enabling spraying function of nozzle 37. As push rod 31 reciprocates up and down once, its upward movement not only pushes water in piston cylinder 30 into water passage plate 33, but also causes water suction hose 22 to draw water between primary filter screen 11 and secondary filter screen 12 in water tank 01 into piston cylinder 30, located below the piston head on push rod 31. When the push rod 31 moves over the position of the hemispherical top 21, it will move downward under the reset action of the spring in the piston cylinder 30, so that the water sucked into the piston cylinder 30 by the water suction hose 22 can flow into the upper end of the piston cylinder 30 through the one-way valve 32 on the piston head. As the push rod 31 continues to move up and down, the water replenishment function is realized continuously. The water-passing plates 33 at both ends of the cleaning rod 08 have the same water replenishment principle. The filtered water can be directly used to achieve the cleaning of the filtered water, which is energy-saving and environmentally friendly and reduces waste.

[0045] Furthermore, it also includes a reset device for resetting the trigger device, and the reset device includes a limit groove opened on the side rod of the cleaning rod 08, and a water accumulation plate 17 that can slide up and down along the limit groove is slidably connected in the limit groove. The water accumulation plate 17 is fixedly connected to the support rod 18, and a water outlet hole 25 is opened on the water accumulation plate 17.

[0046] For example, after the primary filter 11 is cleaned and its filtering function is restored, water can flow out of the primary filter 11 quickly and will not remain in the primary filter 11. This increases the water flow rate. A large amount of water flowing out of the water accumulation plate 17 is collected by the water accumulation plate 17, which increases the gravity of the water accumulation plate 17. As a result, the water accumulation plate 17 moves downward under the action of gravity, which in turn pulls the support rod 18 downward. The support rod 18 pushes wedge 19 to reset it. Wedge 19 then pushes the push rod 20 to reset wedge 23. Finally, wedge 23 pushes the slide plate 15 to reset it through the fixed rod 26. At the same time, due to the provision of an unlocking device, the slide plate 15 can only be reset when the filtering function of the primary filter 11 has been restored to a certain level and a large amount of water has been discharged, so that the water accumulation plate 17 has sufficient gravity. This ensures that the cleaning function is only reset when the primary filter 11 is fully cleaned, ensuring the cleaning effect. Since the water accumulation plate 17 is provided with a water outlet 25, the water flowing into the water accumulation plate 17 can be discharged, thereby ensuring that the water accumulation plate 17 will not be directly filled when water accumulates. The water accumulation plate 17 will not be filled until the water flow in the first-level filter 11 is large enough to realize the reset function.

[0047] Furthermore, it also includes a salvage device for salvaging suspended matter in the first-level filter 11. The salvage device includes an auger 07 fixedly connected to the wedge block 23, and a lifting rod 06 fixedly connected to the water tank 01 and extending into the first-level filter 11. The auger 07 is located inside the lifting rod 06.

[0048] For example, when cleaning rod 08 rotates, it simultaneously drives wedge block 23 through slot 24, which in turn drives auger 07. This rotation of auger 07 can propel flocs deposited within primary filter 11 or impacted by nozzle 37 to the lower end of primary filter 11, where they are then driven upward by auger 07 and out of water tank 01. Lifting rod 06 has an opening near the lower end of primary filter 11 to facilitate the flow of flocs into lifting rod 06 and upward transport by auger 07. This reduces the accumulation of debris within primary filter 11, ensuring that primary filter 11 can continue to operate efficiently.

[0049] In one embodiment, the water tank 01 is a closed cylindrical water tank, and the top of the water tank 01 is connected to a drain outlet 05 that allows sewage to flow into the primary filter 11, and the lower end is connected to a sewage outlet 03 that allows sewage to flow out between the primary filter 11 and the secondary filter 12. A water inlet 02 that can discharge filtered water is provided on the side wall, and the water inlet 02, the drain outlet 05 and the sewage outlet 03 are all provided with electromagnetic valves, and the water inlet 02, the drain outlet 05 and the sewage outlet 03 are all controlled by electromagnetic valves.

[0050] For example, sewage can be discharged into the water tank 01 through the drain outlet 05 and filtered through the primary filter 11. Impurities between the primary filter 11 and the secondary filter 12 can be discharged through the drain outlet 03. The water filtered by the primary filter 11 and the secondary filter 12 can be discharged through the water inlet 02.

[0051] Therefore, the oilfield produced water flocculent suspended solids treatment system of the present invention solves the technical problems of low filtration efficiency and difficulty in cleaning of the current filtration devices in the related art, and achieves beneficial effects:

[0052] 1. When cleaning is needed, the trigger device extends the brush plate and nozzle out of the cleaning rod. This ensures that when cleaning is not in progress, the sewage flowing out of the primary filter will not continuously impact the brush plate and nozzle for a long time, thereby ensuring that the nozzle of the nozzle is not easily clogged by impurities in the sewage, causing it to malfunction. At the same time, it reduces the amount of impurities sticking to the brush plate, which may cause the cleaning function to decline. When the brush plate and nozzle are retracted into the nozzle hole and brush plate groove, the nozzle hole and brush plate groove can scrape off impurities on the brush plate and nozzle. The cleaning rod is then driven by the motor to rotate, and when the cleaning rod rotates, it can drive the nozzle and brush plate to work, thereby cleaning the entire primary filter and secondary filter for a more complete cleaning.

[0053] 2. The function of triggering is realized by the accumulated water generated when the first-level filter is blocked. No separate power device is required. Not only is the structure simple, but it can also judge whether to clean according to whether it is blocked, instead of cleaning in real time, thereby reducing the cost of use;

[0054] 3. The filtered water can be directly used through the water supply mechanism to achieve clean filtration, energy saving, environmental protection and reduce waste;

[0055] 4. The unlocking mechanism allows the trigger mechanism to activate only after the filtering function has decreased to a certain level, eliminating continuous operation or frequent triggering, thus reducing operating costs. The spring rate can be adjusted according to actual needs to accommodate different requirements. Furthermore, the slide plate can only be reset when the primary filter's filtering function has recovered to a certain level, draining a large amount of water and providing sufficient gravity for the water accumulation plate. This ensures that the cleaning function will only reset when the primary filter is fully clean, ensuring effective cleaning.

[0056] In the description of the present invention, the terms "first," "second," "another," and "yet another" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly specifying the number of the technical features indicated. Thus, a feature specified as "first" or "second" may explicitly or implicitly include one or more of the described features. In the description of the embodiments of the present invention, "plurality" means two or more, unless otherwise specifically defined.

[0057] In the description of the present invention, it should be noted that, unless otherwise specified or limited, the terms "connected" and "connection" should be understood in a broad sense. For example, it can mean a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium. For those of ordinary skill in the art, the specific meanings of the above terms in the present invention can be understood in specific circumstances. In addition, in the description of the present invention, unless otherwise specified, "plurality" means two or more.

[0058] While embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions, and variations may be made to the embodiments without departing from the principles and spirit of the invention, and that the scope of the invention is defined by the claims and their equivalents.

Claims

1. A system for treating flocculent suspended matter in oilfield produced water, characterized in that: The invention comprises a water tank (01) and a trigger device, wherein a primary filter screen (11) and a secondary filter screen (12) are fixed inside the water tank (01), wherein the primary filter screen (11) is located inside the secondary filter screen (12) so that a receiving cavity is formed between the primary filter screen (11) and the secondary filter screen (12), and a motor (04) is fixed on the outer wall of the lower end of the water tank (01), wherein the output shaft of the motor (04) is fixedly connected to the bottom of the cleaning rod (08), wherein the shape of the cleaning rod (08) is U-shaped, and the two side rods extend into the receiving cavity, and an inner cavity (35) is opened inside each side rod, wherein the inner cavity (35) is provided in the inner cavity. A water-passing plate (33) that can slide up and down is provided in the cavity (35), the interior of the water-passing plate is hollowed out for storing water, a brush plate (36) and a nozzle (37) for brushing the primary filter (11) and the secondary filter (12) are fixedly mounted on the water-passing plate (33), the nozzle (37) being connected to the interior of the water-passing plate (33) for spraying water in the water-passing plate (33), a nozzle hole (13) and a brush plate groove (14) are provided on both sides of each side rod, and the nozzle (37) and the brush plate (36) are respectively arranged in the nozzle hole (13) and the brush plate groove (14); The trigger device is used to trigger the water-passing plate (33) to drive the brush plate (36) and the nozzle (37) to move from the nozzle hole (13) and the brush plate groove (14) when cleaning the primary filter (11) and the secondary filter (12); the trigger device includes a sliding bin (16) fixedly connected to the lower end of the primary filter (11), a slide plate (15) slidably connected in the sliding bin (16), a fixing rod (26) fixedly connected to the lower surface of the slide plate (15), a wedge block 2 (23) fixedly connected to the lower end of the fixing rod (26), and a slot (23) for limiting the wedge block 2 (23) is provided on the upper surface of the bottom of the cleaning rod (08). 24), wedge block 2 (23) is slidably connected in the card slot (24), and the bottom of the cleaning rod (08) is connected to a push rod (20) that can slide along the bottom of the cleaning rod (08), and when the wedge block 2 (23) moves downward, the push rod (20) is pushed to move in a direction away from the wedge block 2 (23); a connecting rod (34) is hinged on the water-passing plate (33), and a support rod (18) is hinged on the connecting rod (34), and one end of the push rod (20) away from the wedge block 2 (23) is fixedly connected to the wedge block 1 (19), and when the push rod (20) moves in a direction away from the wedge block 2 (23), the wedge block 1 (19) pushes the support rod (18) to move upward.

2. The oilfield produced water flocculent suspended solids treatment system according to claim 1, characterized in that: The trigger device further comprises an unlocking device, the unlocking device comprising a fixed cylinder (27) fixedly connected to the outer wall of the sliding bin (16), a limit clamp (28) being slidably connected in the fixed cylinder (27), and a spring capable of resetting the limit clamp (28) being provided in the fixed cylinder (27).

3. The oilfield produced water flocculent suspended solids treatment system according to claim 1, characterized in that: The water supply mechanism further comprises a through groove (29) provided at the bottom of the cleaning rod (08); a piston cylinder (30) is fixedly connected to a side surface of the wedge block (19) close to the through groove (29); the piston cylinder (30) is slidably connected in the through groove (29); a push rod (31) is slidably connected to the piston cylinder (30); a spring capable of resetting the push rod (31) is provided in the piston cylinder (30); a hemispherical top (21) is fixedly connected to the lower surface of the inner wall of the water tank (01); the hemispherical top (21) is used to push the push rod (31) into the piston cylinder (30) when the push rod (31) rotates with the cleaning rod (08); the piston cylinder (30) is close to the hemispherical top (21) A one-way valve (32) is provided on one end of the piston cylinder (30), and a piston head is provided on one end of the push rod (31) located in the piston cylinder (30) and is slidably connected to the piston cylinder (30). The one-way valve (32) provided on the piston cylinder (30) can flow in a direction from the outside of the piston cylinder (30) to the inside, and the one-way valve (32) provided on the push rod (31) can flow from the side close to the hemispherical top (21) to the side away from the hemispherical top (21). The position where the one-way valve (32) is provided on the piston cylinder (30) is connected to a water suction hose (22), and the piston cylinder (30) and the water-passing plate (33) are connected through a connecting pipe (38).

4. The oilfield produced water flocculent suspended solids treatment system according to claim 1, characterized in that: The invention also includes a reset device for resetting the trigger device, wherein the reset device includes a limit groove provided on the side rod of the cleaning rod (08), a water accumulation plate (17) slidably connected in the limit groove and capable of sliding up and down along the limit groove, the water accumulation plate (17) being fixedly connected to the support rod (18), and a water outlet hole (25) being provided on the water accumulation plate (17).

5. The oilfield produced water flocculent suspended solids treatment system according to claim 1, characterized in that: It also includes a salvaging device for salvaging suspended matter in the first-stage filter (11), the salvaging device including an auger (07) fixedly connected to the second wedge (23), a lifting rod (06) extending into the first-stage filter (11) is fixedly connected to the water tank (01), and the auger (07) is located inside the lifting rod (06).

6. The oilfield produced water flocculent suspended solids treatment system according to claim 1, characterized in that: The water tank (01) is a closed cylindrical water tank. The top of the water tank (01) is connected to a drain outlet (05) that allows sewage to flow into the primary filter (11). The bottom of the water tank (01) is connected to a sewage outlet (03) that allows sewage between the primary filter (11) and the secondary filter (12) to flow out. A water inlet (02) that can discharge filtered water is provided on the side wall. The water inlet (02), the drain outlet (05) and the sewage outlet (03) are all provided with electromagnetic valves.

7. The oilfield produced water flocculent suspended matter treatment system according to any one of claims 1 to 6, characterized in that: Two groups of nozzle holes (13), brush plate grooves (14), brush plates (36), nozzles (37), and water-passing plates (33) are symmetrically arranged in the inner cavity (35) of the cleaning rod (08).

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