Oil field polymer flooding water treatment system

Abstract

The invention discloses an oil field polymer flooding water treatment system, and belongs to the technical field of sewage treatment, the oil field polymer flooding water treatment system comprises a shell, the shell is internally provided with a polymer flooding water treatment system composed of a pretreatment tank, an oil removal device, a sedimentation tank, an ozone oxidation tank and an MBR membrane purification tank in sequence from right to left; according to the oil field polymer flooding water treatment system, a first rotating rod is arranged and can drive a mounting frame and a sieve plate membrane to rotate while rotating, polymer flooding water can be demulsified again through a modified polytetrafluoroethylene material of the sieve plate membrane when the sieve plate membrane rotates, the polymer flooding water can form vortexes when the sieve plate membrane rotates, and certain centrifugal force is generated; the centrifugal force generated by the vortex enables oil phase particles to float upwards to the center, when floating to the side face of the oil inlet, the oil phase particles can be conveyed into the oil storage tank through cooperation of parts, a water phase can be conveyed into the drainage groove along the upper edge opening of the oil removal barrel, and the oil phase collection efficiency can be improved conveniently.

Description

Technical Field

[0001] The present invention relates to the technical field of sewage treatment, in particular to an oilfield polymer flooding water treatment system. Background Art

[0002] As oilfield development enters its mid- to late-stages, polymer flooding (PFI) has become a core approach to enhancing crude oil recovery. This technology expands the swept volume by injecting a high-molecular-weight polymer solution into the formation. However, the resulting PFI produced water exhibits properties significantly different from conventional oily wastewater: its viscosity is 2-5 times higher than conventional produced water, and it contains residual anionic polyacrylamide (HPAM) at levels of 200-800 mg / L, colloidal emulsified oil, and micron-sized suspended solids. This wastewater exhibits "three highs"—high viscosity, high emulsion stability, and high treatment complexity. Conventional water treatment processes struggle to meet reinjection or discharge requirements, necessitating an oilfield PFI water treatment system to treat PFI water to meet reinjection standards.

[0003] Authorization publication number CN113023914B discloses a treatment system and method for oil-water separation of produced water from chemical flooding in oilfields. This system effectively separates oil from water in chemical flooding-prone oily wastewater, achieving both effective oil-water separation and the removal of some oil and suspended solids contaminants. After treatment with the system and method, the effluent meets the required oil content of ≤50 mg / L and suspended solids content of ≤50 mg / L, meeting the water quality requirements of subsequent water treatment equipment and reducing the processing load on such equipment. In addition, the treatment system of the present invention is safe, reliable and easy to operate. It is a movable skid-mounted complete treatment system that meets the needs of produced water treatment in dispersed blocks of chemical drive in oil fields, thereby realizing on-site separation and treatment of oil and water quickly and efficiently. The invention performs three-phase separation by rotating the sieve membrane when separating the three phases of slag, oil and water. However, the rotation of the sieve membrane will cause the concentrated drive water to generate vortexes, and the oil phase is lighter and will converge to the middle, which is more difficult to collect. In addition, when cleaning the sieve membrane, the concentrated drive water inside the multi-stage circulating flotation column needs to be used to clean the surface of the sieve membrane. The cleaning is more complicated and inconvenient for real-time cleaning. Summary of the Invention

[0004] The object of the present invention is to provide an oilfield polymer flooding water treatment system, which demulsifies the polymer flooding water by rotating a sieve plate membrane. When the polymer flooding water is demulsified, a vortex is generated in the polymer flooding water. When the vortex is generated, the oil phase is collected through the oil inlet, thereby improving the oil phase collection efficiency. When the sieve plate membrane rotates, a cleaning brush cleans its surface, thereby improving the demulsification efficiency of the sieve plate membrane.

[0005] To achieve the above-mentioned object, the present invention provides the following technical solution: an oilfield polymer flooding water treatment system, comprising: a housing, wherein the polymer flooding water treatment system consisting of a pretreatment tank, an oil removal device, a sedimentation tank, an ozone oxidation tank, and an MBR membrane purification tank are installed in sequence from right to left inside the housing, wherein the pretreatment tank is used to perform preliminary condensation of oil in the polymer flooding water, the oil removal device is used to separate the residue, oil, and water in the polymer flooding water into three phases, the sedimentation tank is used to perform sedimentation treatment on the polymer flooding water after the oil residue is removed, the ozone oxidation tank is used to perform ozone treatment on the polymer flooding water, and the MBR membrane purification tank is used to perform deep treatment on the polymer flooding water;

[0006] The pretreatment tank includes a water inlet pipe for conveying polymer flooding water to the pretreatment tank, and a dosing device for conveying demulsifier into the polymer flooding water;

[0007] A water inlet pipe is installed inside the pretreatment tank, and a dosing device is installed on the top of the shell, and the dosing device is connected to the water inlet pipe through a pipeline;

[0008] The oil removal device includes an oil removal cylinder for placing polymer flooding water, a slag storage box for separating the polymer flooding water into three phases of slag, oil and water, an oil collecting assembly, an oil removal assembly and a drainage trough, and a driving assembly for driving the oil removal assembly to rotate;

[0009] An oil removal cylinder is installed inside the shell, and a slag storage box is installed at the bottom of the oil removal cylinder through a pipeline;

[0010] An oil collecting assembly is installed inside the oil removal cylinder, and an oil removal assembly is installed on the side of the oil collecting assembly;

[0011] A driving assembly is installed on the top of the oil collecting assembly, and a drainage trough is fixedly installed on the upper edge of the top of the oil removing cylinder.

[0012] Preferably, the pretreatment tank further comprises an impeller for mixing the polymer flooding water with the demulsifier, and an aerator for increasing the agglomeration of fine oil liquid;

[0013] An impeller is installed inside the water inlet pipe close to the dosing device, and an aerator is installed inside the pretreatment tank.

[0014] Preferably, the drive assembly includes a reduction gear box for mounting components of the drive assembly, a drive motor for applying driving force to the drive assembly, and a movable mounting plate for mounting the drive motor;

[0015] A reduction gear box is fixedly mounted on the top of the housing near the oil removal cylinder, and a movable mounting plate is movably mounted on the top of the reduction gear box through an assembly slot;

[0016] A driving motor is fixedly mounted on the movable mounting plate, and an output end of the driving motor passes through the top of the movable mounting plate;

[0017] The driving assembly further includes a driving gear for adjusting the rotational speed of the driving assembly, a telescopic rod for converting the driving gear, a first cylinder, and a slide rail for mounting the first cylinder;

[0018] One end of the telescopic rod is fixedly mounted on the output end of the drive motor, and three drive gears with decreasing diameters from top to bottom are fixedly mounted at equal distances below the telescopic end of the telescopic rod;

[0019] A slide rail is fixedly installed at the bottom of the inner wall of the reduction box, and a first cylinder is movably installed on the slide rail;

[0020] The output end of the first cylinder is connected to the bottom end of the telescopic rod through a bearing.

[0021] Preferably, the driving assembly further comprises a second cylinder for driving the driving motor to move, and a first fixing frame and a fixing plate for mounting the second cylinder;

[0022] A first fixing frame is fixedly mounted on the movable mounting plate, and a second cylinder is fixedly mounted on the first fixing frame;

[0023] A fixing plate is fixedly mounted on the output end of the second cylinder, and the bottom of the fixing plate is fixedly mounted on the top of the reduction gear box;

[0024] The driving assembly further includes a rotating shaft for driving the oil collecting assembly to rotate, and a reduction gear set for reducing the rotation of the rotating shaft;

[0025] A rotating shaft is rotatably installed between the reduction box body and the shell, and a reduction gear set matched with the driving gear is provided on the outer surface of the reduction box body near the rotating shaft.

[0026] Preferably, the oil collecting assembly includes a sleeve for axial sliding of the rotating shaft, and an annular gear block, a second fixing frame, a first rotating rod, a first gear and a thread for adjusting the height of the rotating shaft;

[0027] A sleeve is axially movably mounted on the outer surface of the middle portion of the rotating shaft through a guide groove and a guide rod, and the sleeve is rotatably mounted inside the reduction gearbox and the housing through a bearing.

[0028] A plurality of annular gear blocks are installed at equal distances on the upper outer surface of the rotating shaft, and a second fixing frame is fixedly installed on the top of the reduction gear box;

[0029] One end of the first rotating rod is rotatably mounted on a surface of the second fixing frame close to the rotating shaft via a bearing, and the other end of the first rotating rod passes through the surface of the first fixing frame and is connected via a thread;

[0030] A first gear matched with the annular gear block is fixedly mounted on the outer surface of the first rotating rod.

[0031] Preferably, the oil collecting assembly further comprises an oil inlet for conveying oil, a first rotating rod and an oil outlet, a lifting rod for adjusting the height of the oil inlet, and an oil storage tank for storing oil;

[0032] A lifting rod is fixedly mounted on the bottom end of the rotating shaft, and the outer surface of the lifting rod is provided with at least four oil inlets in a circular array;

[0033] The outer surface of the lifting rod is provided with a first rotating rod axially movable with the guide rod through a guide groove, and the bottom of the inner wall of the oil removal cylinder is fixedly provided with an oil outlet through an assembly groove;

[0034] The top end of the oil outlet is connected to the bottom end of the first rotating rod through a bearing, and an oil storage tank is fixedly installed at the end of the oil outlet, and the oil storage tank is fixedly installed inside the shell.

[0035] Preferably, the oil removal assembly includes a sieve plate membrane for oil-liquid separation, a mounting frame for mounting the sieve plate membrane, and a cleaning brush for cleaning the sieve plate membrane;

[0036] At least three mounting brackets are fixedly mounted on the outer surface of the first rotating rod in a circular array, and the sieve plate membrane is mounted on the mounting brackets;

[0037] A cleaning brush is provided on the surface of the sieve plate membrane.

[0038] Preferably, the oil removal assembly further comprises a second rotating rod for mounting the cleaning brush, a mounting seat for mounting the second rotating rod, and a third gear, a slide groove and a rack for rotating the cleaning brush and the second rotating rod;

[0039] A second rotating rod is installed through the interior of the cleaning brush, and a second rotating rod is installed rotatably through the interior of the mounting seat via the assembly groove;

[0040] A third gear is fixedly mounted on one end of the second rotating rod, and a sliding groove is provided on a side of the mounting frame close to the third gear;

[0041] A rack matched with the third gear is installed inside the sliding groove.

[0042] Preferably, the oil removal assembly further comprises an internally threaded slider and a reciprocating screw for movement of the mounting seat, and a mounting groove for mounting the internally threaded slider and the reciprocating screw;

[0043] The mounting frame is provided with a mounting groove on the other side away from the slide groove, and a reciprocating screw rod is rotatably installed inside the mounting groove;

[0044] The side surface of the reciprocating screw rod is threadedly connected with an internal thread slider, and one end of a mounting seat is fixedly mounted on the side surface of the internal thread slider.

[0045] Preferably, the oil removal assembly further comprises a first bevel gear, a second rotating rod, a second bevel gear, a second gear and a gear ring for rotating the reciprocating screw;

[0046] A first bevel gear is fixedly mounted on the lower outer surface of the reciprocating screw, and a second rotating rod is rotatably mounted through the bottom of the mounting groove;

[0047] A second bevel gear is fixedly mounted on the outer surface of the second rotating rod close to the first bevel gear, and a second gear is fixedly mounted on the end of the second rotating rod;

[0048] A gear ring matched with the second rotating rod is fixedly installed on the inner wall of the oil removal cylinder.

[0049] Compared with the prior art, the beneficial effects of the present invention are: the oilfield polymer flooding water treatment system;

[0050] 1. A first rotating rod is provided, which can simultaneously drive the mounting frame and the sieve plate membrane to rotate. When the sieve plate membrane rotates, it can re-demulsify the polymer flooding water through its own modified polytetrafluoroethylene material. When the sieve plate membrane rotates, the polymer flooding water forms a vortex, generating a certain centrifugal force. The centrifugal force generated by the vortex causes the oil phase particles to float upward to the center. When the oil phase particles float to the side of the oil inlet, they can be transported to the inside of the oil storage tank through the cooperation of the components, while the water phase will be transported to the inside of the drainage trough along the upper edge of the oil removal cylinder, which can conveniently improve the collection efficiency of the oil phase;

[0051] 2. A drive motor is provided which can move laterally through the operation of the second cylinder. When the second cylinder moves laterally, it can drive the telescopic rod and the drive gear to move. When the drive gear moves to the specified position, the three drive gears with different diameters can be switched through the operation of the first cylinder. After the drive gear is switched, the speed of the drive motor can be adjusted according to the amount of water entering the flooding. The less the amount of water entering, the faster the speed, and the less the amount of water entering, the slower the speed. The speed can adjust the depth of the vortex.

[0052] 3. A second cylinder is provided to push the driving motor to move. When the second cylinder is working, it can push the first fixed frame to move. When the first fixed frame moves, the cooperation between the thread groove and the thread can drive the first rotating rod to rotate. When the first rotating rod rotates, the cooperation between the first gear and the annular gear block can drive the rotating shaft and the lifting rod to rise and fall. When the lifting rod is raised and lowered, the height of the oil inlet can be adjusted, so that the oil inlet can be adjusted in height according to the depth of the vortex.

[0053] 4. The mounting frame and the sieve plate membrane can be driven to move up and down by the reciprocating screw and the internal thread slider and other parts when the mounting frame and the cleaning brush are rotated. The mounting frame and the cleaning brush can be rotated by the cooperation of the third gear and the rack when they move up and down. The cleaning brush can clean the surface of the sieve plate membrane when it rotates, so that the sieve plate membrane can be cleaned during the rotation process.

[0054] 5. When the polymer flooding water is transported inside the water inlet pipe, the dosing device can transport the demulsifier into the water inlet pipe. The demulsifier can destroy the emulsion and promote oil-water separation. When the polymer flooding water is transported inside the water inlet pipe, the water flow will drive the impeller to rotate. When the impeller rotates, the polymer flooding water and the demulsifier can be fully mixed. When the polymer flooding water and the demulsifier enter the pretreatment tank, the aerator can work to transport external air into the pretreatment tank. The air entering the pretreatment tank will generate small bubbles. The small bubbles can carry the small oil droplets inside the polymer flooding water to float on the water surface of the polymer flooding water, which is convenient for the pretreatment of the polymer flooding water and can greatly improve the separation efficiency of the oil phase. BRIEF DESCRIPTION OF THE DRAWINGS

[0055] Figure 1 It is a schematic diagram of the three-dimensional structure of the present invention;

[0056] Figure 2 It is a schematic diagram of the three-dimensional cross-sectional structure of the present invention;

[0057] Figure 3 It is a schematic diagram of the three-dimensional cross-sectional structure of the oil removal device of the present invention;

[0058] Figure 4 This is a schematic diagram of the three-dimensional cross-sectional structure of the reduction gearbox of the present invention;

[0059] Figure 5 It is a schematic diagram of the three-dimensional cross-sectional structure of the oil removal component of the present invention;

[0060] Figure 6 This is a schematic diagram of the polymer flooding water treatment process structure of the present invention;

[0061] Figure 7 It is a schematic structural diagram of the present invention;

[0062] Figure 8 It is a structural schematic diagram of the present invention.

[0063] In the figure: 100, housing;

[0064] 200, pretreatment tank; 210, water inlet pipe; 220, impeller; 230, dosing device; 240, aerator;

[0065] 300. Oil removal device;

[0066] 310, degreasing cylinder;

[0067] 320, slag storage box;

[0068] 330, drive assembly; 331, reduction gear box; 332, movable mounting plate; 333, drive motor; 334, telescopic rod; 335, drive gear; 336, first cylinder; 337, slide rail; 338, first fixed bracket; 339, second cylinder; 3310, fixed plate; 3311, rotating shaft; 3312, reduction gear set;

[0069] 340, oil collecting assembly; 341, sleeve; 342, annular gear block; 343, second fixing bracket; 344, first rotating rod; 345, first gear; 346, thread; 347, lifting rod; 348, oil inlet; 349, first rotating rod; 3410, oil outlet; 3411, oil storage tank;

[0070] 350, oil removal assembly; 351, mounting bracket; 352, sieve plate membrane; 353, cleaning brush; 354, mounting base; 355, internally threaded slider; 356, reciprocating screw; 357, mounting slot; 358, first bevel gear; 359, second rotating rod; 3510, second bevel gear; 3511, second gear; 3512, gear ring; 3513, second rotating rod; 3514, third gear; 3515, slide slot; 3516, rack;

[0071] 360, drainage trough;

[0072] 400, sedimentation tank;

[0073] 500. Ozone oxidation pool;

[0074] 600. MBR membrane purification tank. DETAILED DESCRIPTION

[0075] In order to enable those skilled in the art to better understand the present invention, the following will clearly and completely describe the technical solutions in the embodiments of the present invention in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments in the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts should fall within the scope of protection of this application.

[0076] It should be noted that the terms "first", "second", etc. in the specification and claims of this application and the above-mentioned drawings are used to distinguish similar objects and are not necessarily used to describe a specific order or sequence. It should be understood that the numbers used in this way can be interchanged where appropriate for the embodiments of the present application described herein. In addition, the terms "including" and "having" and any variations thereof are intended to cover non-exclusive inclusions. For example, a process, method, system, product or vehicle that includes a series of steps or units is not necessarily limited to those steps or units clearly listed, but may include other steps or units that are not clearly listed or inherent to these processes, methods, products or vehicles.

[0077] Furthermore, the terms "installed," "disposed," "provided with," "connected," "connected," and "socketed" should be interpreted broadly. For example, they can refer to fixed connections, removable connections, or integral structures; mechanical connections or electrical connections; direct connections, indirect connections through an intermediary, or internal communication between two devices, elements, or components. Those skilled in the art will understand the specific meanings of these terms in this application based on the specific circumstances.

[0078] See also Figure 1 、 Figure 2 and Figure 6 The present invention provides an embodiment: a polymer flooding water treatment system for an oilfield, comprising: a housing 100, wherein the polymer flooding water treatment system is sequentially installed inside the housing 100 from right to left, and comprises a pretreatment tank 200, an oil removal device 300, a sedimentation tank 400, an ozone oxidation tank 500, and an MBR membrane purification tank 600. The pretreatment tank 200 is used to perform preliminary condensation of oil in the polymer flooding water, the oil removal device 300 is used to separate the residue, oil, and water in the polymer flooding water, the sedimentation tank 400 is used to perform sedimentation treatment on the polymer flooding water after the oil residue is removed, the ozone oxidation tank 500 is used to perform ozone treatment on the polymer flooding water, and the MBR membrane purification tank 600 is used to perform deep treatment on the polymer flooding water.

[0079] It should be noted that the polymer flooding water can be transported to the interior of the pretreatment tank 200 through a pipeline, and the oil and water can be separated by the cooperation of the emulsifier and aeration. After the oil and water are separated, they can be transported to the interior of the oil removal device 300 by a water pump. The oil removal device 300 can separate the slag, oil and water into three phases by a rotary centrifugal method. The slag and oil will be collected after separation. The separated water can be transported to the interior of the sedimentation tank 400 by a water pump. After the water enters the sedimentation tank 400, a coagulant is added for precipitation treatment. After precipitation, the polymer flooding water can be transported to the interior of the ozone oxidation tank 500 by a water pump. After entering the ozone oxidation tank 500, the polymer flooding water can be ozonized by the cooperation of the ozone generator and the packing layer. After the ozonation treatment, the polymer flooding water can be transported to the MBR membrane purification tank 600 by a water pump for deep purification treatment. The deep purification treatment of the polymer flooding water will meet the emission standards for reinjection.

[0080] like Figure 1 、 Figure 2 and Figure 6 As shown, the pretreatment tank 200 includes a water inlet pipe 210 for transporting polymer flooding water to the pretreatment tank 200, and a dosing device 230 for transporting demulsifier to the interior of the polymer flooding water. The water inlet pipe 210 is installed inside the pretreatment tank 200, and the dosing device 230 is installed on the top of the housing 100. The dosing device 230 is connected to the water inlet pipe 210 through a pipeline;

[0081] It can be imagined that when the polymer flooding water is transported inside the water inlet pipe 210, the dosing device 230 can transport the demulsifier into the interior of the water inlet pipe 210. The demulsifier can destroy the emulsion and promote oil-water separation. The polymer flooding water can be transported to the interior of the pretreatment tank 200 through the water inlet pipe 210. The water inlet pipe 210 is located inside the pretreatment tank 200 and is equidistantly provided with multiple water outlet holes to evenly transport the polymer flooding water.

[0082] like Figure 1-Figure 3 、 Figure 6 As shown, the oil removal device 300 includes an oil removal cylinder 310 for placing polymer flooding water, a slag storage box 320 for separating the polymer flooding water into three phases of slag, oil and water, an oil collecting assembly 340, an oil removal assembly 350 and a drainage trough 360, and a drive assembly 330 for driving the oil removal assembly 350 to rotate. The oil removal cylinder 310 is installed inside the shell 100, the slag storage box 320 is installed at the bottom of the oil removal cylinder 310 through a pipeline, the oil collecting assembly 340 is installed through the inside of the oil removal cylinder 310, the oil collection assembly 350 is installed on the side of the oil collection assembly 340, the drive assembly 330 is installed on the top of the oil collection assembly 340, and the drainage trough 360 is fixedly installed on the upper edge of the top of the oil removal cylinder 310;

[0083] It is worth noting that the water pump can transport the flooded water inside the pretreatment tank 200 to the inside of the oil removal cylinder 310. After the flooded water enters the oil removal cylinder 310, the driving assembly 330 can drive the oil removal assembly 350 to rotate through the oil collecting assembly 340. When the oil removal assembly 350 rotates, a vortex is generated in the flooded water. When the flooded water generates a vortex, the oil will float upward and toward the axis, the heavier solid particles will settle downward, and the treated water phase will flow to the side. Therefore, when the oil removal assembly 350 rotates, the flooded water can be separated into three phases: slag, oil and water. The slag can be collected through the slag storage box 320 at the bottom, the oil phase can be collected through the oil collecting assembly 340, and the water phase can be discharged through the drainage trough 360.

[0084] like Figure 1 、 Figure 2 and Figure 6 As shown, the pretreatment tank 200 further includes an impeller 220 for mixing the polymer flooding water with the demulsifier, and an aerator 240 for increasing the agglomeration of fine oil. The impeller 220 is installed inside the water inlet pipe 210 near the dosing device 230, and the aerator 240 is installed inside the pretreatment tank 200;

[0085] It is clear that when the polymer flooding water is transported inside the water inlet pipe 210, the water flow drives the impeller 220 to rotate. When the impeller 220 rotates, the polymer flooding water and the demulsifier are fully mixed. When the mixed polymer flooding water and demulsifier are discharged through the water outlet on the water inlet pipe 210, the aerator 240 operates to transport external air into the pretreatment tank 200. After the air enters the pretreatment tank 200, fine bubbles are generated. The fine bubbles can carry fine oil droplets in the polymer flooding water and float them on the surface of the polymer flooding water.

[0086] like Figure 1-Figure 4 As shown, the drive assembly 330 includes a reduction gear box 331 for mounting the components of the drive assembly 330, a drive motor 333 for applying driving force to the drive assembly 330, and a movable mounting plate 332 for mounting the drive motor 333. The reduction gear box 331 is fixedly mounted on the top of the housing 100 near the oil removal cylinder 310. The movable mounting plate 332 is movably mounted on the top of the reduction gear box 331 through an assembly slot. The drive motor 333 is fixedly mounted on the movable mounting plate 332, and the output end of the drive motor 333 passes through the top of the movable mounting plate 332.

[0087] It should be considered that the movable mounting plate 332 can be moved by the operation of parts. When the movable mounting plate 332 moves, it can slide in the assembly groove at the top of the reduction gear box body 331. When the movable mounting plate 332 slides, it can drive the drive motor 333 to move, so that the drive component 330 can adjust the speed by moving the drive motor 333.

[0088] like Figure 3 and Figure 4 As shown, the drive assembly 330 also includes a drive gear 335 for adjusting the speed of the drive assembly 330, a telescopic rod 334 and a first cylinder 336 for converting the drive gear 335, and a slide rail 337 for mounting the first cylinder 336. The output end of the drive motor 333 is fixedly mounted with one end of the telescopic rod 334. Three drive gears 335 with decreasing diameters from top to bottom are fixedly mounted at equal distances at the lower part of the telescopic end of the telescopic rod 334. The three drive gears 335 can all cooperate with the reduction gear set 3312. A slide rail 337 is fixedly mounted on the bottom of the inner wall of the reduction box 331. The first cylinder 336 is movably mounted on the slide rail 337. The output end of the first cylinder 336 is connected to the bottom end of the telescopic rod 334 through a bearing.

[0089] It should be noted that when the drive motor 333 moves, it can drive the telescopic rod 334 at the output end to move. When the telescopic rod 334 moves, it can drive the driving gear 335 on the surface and the first cylinder 336 at the end to move. When the first cylinder 336 moves, the bottom end can move on the slide rail 337. When the drive motor 333 and the driving gear 335 move to a fixed position, the first cylinder 336 can push the telescopic rod 334 to extend and retract when working. When the telescopic rod 334 extends and retracts, it can drive the three driving gears 335 on the surface to rise and fall. Since the diameters of the three driving gears 335 decrease from top to bottom, the three driving gears 335 can switch between different speeds when rising and falling.

[0090] like Figure 3 and Figure 4 As shown, the driving assembly 330 also includes a second cylinder 339 for driving the driving motor 333, and a first fixing bracket 338 and a fixing plate 3310 for mounting the second cylinder 339. The first fixing bracket 338 is fixedly mounted on the movable mounting plate 332, and the second cylinder 339 is fixedly mounted on the first fixing bracket 338. The fixing plate 3310 is fixedly mounted on the output end of the second cylinder 339, and the bottom of the fixing plate 3310 is fixedly mounted on the top of the reduction gear box body 331.

[0091] It can be imagined that when the second cylinder 339 is working, it can push the first fixed frame 338. When the first fixed frame 338 is pushed, it can drive the movable mounting plate 332 to move. When the movable mounting plate 332 moves, it can drive the driving motor 333 to move. When the driving motor 333 moves, the speed of the driving component 330 can be switched through the cooperation of related parts.

[0092] like Figure 1-Figure 4As shown, the driving assembly 330 further includes a rotating shaft 3311 for driving the oil collecting assembly 340 to rotate, and a reduction gear set 3312 for reducing the rotation of the rotating shaft 3311. The rotating shaft 3311 is rotatably installed between the reduction housing 331 and the housing 100. The reduction gear set 3312 that cooperates with the driving gear 335 is provided on the outer surface of the rotating shaft 3311 near the reduction housing 331.

[0093] It is worth noting that after the speed adjustment of the driving component 330 is completed, the driving motor 333 can drive the telescopic rod 334 and the driving gear 335 to rotate. When the driving gear 335 rotates, it can drive the reduction gear set 3312 to rotate. When the reduction gear set 3312 rotates, it can drive the rotating shaft 3311 to rotate through the sleeve 341.

[0094] like Figure 1-Figure 4 As shown, the oil collecting assembly 340 includes a sleeve 341 for axial sliding of the rotating shaft 3311, an annular gear block 342 for adjusting the height of the rotating shaft 3311, a second fixing frame 343, a first rotating rod 344, a first gear 345 and a thread 346. The sleeve 341 is axially movably installed on the outer surface of the middle part of the rotating shaft 3311 through a guide groove and a guide rod. The sleeve 341 is rotatably installed inside the reduction gear box 331 and the housing 100 through a bearing. A plurality of annular gear blocks 342 are equidistantly installed on the upper outer surface of the rotating shaft 3311. The second fixing frame 343 is fixedly installed on the top of the reduction gear box 331. One end of the first rotating rod 344 is rotatably installed on the surface of the second fixing frame 343 close to the rotating shaft 3311 through a bearing. The other end of the first rotating rod 344 passes through the surface of the first fixing frame 338 and is connected by a thread 346. The outer surface of the first rotating rod 344 is fixedly installed with a first gear 345 that cooperates with the annular gear block 342.

[0095] It can be understood that when the second cylinder 339 is working, it can push the first fixed frame 338 to move. When the first fixed frame 338 moves, it can drive the first rotating rod 344 to rotate through the cooperation between the thread groove and the thread 346. When the first rotating rod 344 rotates, it can rotate through the bearing and the second fixed frame 343. When the first rotating rod 344 rotates, it can drive the first gear 345 to rotate. When the first gear 345 rotates, it drives the rotating shaft 3311 to rise and fall through the cooperation of the annular gear block 342. When the rotating shaft 3311 rises and falls, it can slide axially inside the sleeve 341 through the cooperation of the guide groove and the guide rod.

[0096] like Figure 1-Figure 4 、 Figure 6As shown, the oil collecting assembly 340 also includes an oil inlet 348 for conveying oil, a first rotating rod 349 and an oil outlet 3410, as well as a lifting rod 347 for adjusting the height of the oil inlet 348 and an oil storage tank 3411 for storing oil. The lifting rod 347 is fixedly installed at the bottom end of the rotating shaft 3311. The outer surface of the lifting rod 347 is provided with at least four oil inlets 348 in a circular array. The outer surface of the lifting rod 347 is axially movably mounted with the first rotating rod 349 through a guide groove and the guide rod. The bottom of the inner wall of the oil removing cylinder 310 is fixedly mounted with an oil outlet 3410 through an assembly groove. The top end of the oil outlet 3410 is connected to the bottom end of the first rotating rod 349 through a bearing. The end of the oil outlet 3410 is fixedly mounted with an oil storage tank 3411, and the oil storage tank 3411 is fixedly mounted inside the housing 100.

[0097] It should be understood that when the rotating shaft 3311 is raised or lowered, the lifting rod 347 can be driven to move, and when the lifting rod 347 moves, the oil inlet 348 can be driven to rise or fall. The oil inlet 348 can adjust the height according to the size of the water vortex. When the lifting rod 347 is raised or lowered, the lifting rod 347 can move axially inside the first rotating rod 349 through the cooperation of the guide groove and the guide rod. The oil phase enters the interior of the lifting rod 347 through the oil inlet 348, and then the first rotating rod 349 and the oil outlet 3410 transport the oil phase to the interior of the oil storage tank 3411 for storage.

[0098] like Figure 2-Figure 4 As shown, the oil removal assembly 350 includes a sieve plate membrane 352 for oil-liquid separation, a mounting bracket 351 for mounting the sieve plate membrane 352, and a cleaning brush 353 for cleaning the sieve plate membrane 352. At least three mounting brackets 351 are fixedly mounted in a circular array on the outer surface of the first rotating rod 349. The sieve plate membrane 352 is mounted on the mounting bracket 351, and the cleaning brush 353 is provided on the surface of the sieve plate membrane 352.

[0099] It should be noted that when the reduction gear set 3312 rotates, it can drive the rotating shaft 3311 to rotate through the sleeve 341. When the rotating shaft 3311 rotates, it can drive the lifting rod 347 to rotate. When the lifting rod 347 rotates, it can drive the first rotating rod 349 to rotate. When the first rotating rod 349 rotates, it can rotate through the bearing and the oil outlet 3410. When the first rotating rod 349 rotates, it can also drive the mounting bracket 351 to rotate. When the mounting bracket 351 rotates, it can drive the sieve plate membrane 352 to rotate. When the sieve plate membrane 352 rotates, it can use its own modified polytetrafluoroethylene material to demulsify the polymer flooding water again. When the sieve plate membrane 352 rotates, the polymer flooding water will form a vortex, generating a certain centrifugal force. The centrifugal force generated by the vortex will cause the oil phase particles to float upward to the center. When the oil phase particles float to the side of the oil inlet 348, they can be transported to the inside of the lifting rod 347, and the water phase will be transported to the inside of the drainage trough 360 along the upper edge of the oil removal cylinder 310.

[0100] like Figure 3 、 Figure 5 、 Figure 7 and Figure 8 As shown, the oil removal assembly 350 also includes a second rotating rod 3513 for mounting the cleaning brush 353, a mounting base 354 for mounting the second rotating rod 3513, and a third gear 3514, a slide 3515, and a rack 3516 for rotating the cleaning brush 353 and the second rotating rod 3513. The second rotating rod 3513 is installed through the interior of the cleaning brush 353, and the second rotating rod 3513 is installed and rotated through the interior of the mounting base 354 through an assembly groove. The third gear 3514 is fixedly installed at one end of the second rotating rod 3513. A slide 3515 is formed on the side of the mounting frame 351 near the third gear 3514, and a rack 3516 that cooperates with the third gear 3514 is installed inside the slide 3515.

[0101] It can be imagined that when the mounting seat 354 moves up and down, it can drive the second rotating rod 3513 and the cleaning brush 353 to move along the surface of the sieve plate membrane 352. When the second rotating rod 3513 moves, it can drive the third gear 3514 to move inside the slide groove 3515. When the third gear 3514 moves, it can rotate through the cooperation of the rack 3516. When the third gear 3514 rotates, it can drive the second rotating rod 3513 to rotate on the mounting seat 354. When the second rotating rod 3513 rotates, it can drive the cleaning brush 353 to rotate. When the cleaning brush 353 rotates, it can clean the adhesion on the surface of the sieve plate membrane 352, so that the sieve plate membrane 352 can be used for a long time, reduce the number of regular times, and improve the working efficiency of the sieve plate membrane 352.

[0102] like Figure 3 、 Figure 5 、 Figure 7 and Figure 8As shown, the oil removal assembly 350 also includes an internally threaded slider 355 and a reciprocating screw 356 for moving the mounting seat 354, and a mounting groove 357 for mounting the internally threaded slider 355 and the reciprocating screw 356. The mounting frame 351 has a mounting groove 357 on the other side away from the slide groove 3515. The reciprocating screw 356 is rotatably mounted inside the mounting groove 357. The side of the reciprocating screw 356 is threadedly connected to the internally threaded slider 355. One end of the mounting seat 354 is fixedly mounted on the side of the internally threaded slider 355.

[0103] It is worth noting that when the reciprocating screw 356 rotates, it can rotate inside the mounting groove 357. When the reciprocating screw 356 rotates, it can drive the surface internal thread slider 355 to slide back and forth. When the internal thread slider 355 slides back and forth, it can slide up and down inside the mounting groove 357. When the internal thread slider 355 slides, it can drive the side mounting seat 354 to move up and down. When the mounting seat 354 moves up and down, it can drive the cleaning brush 353 to clean the surface of the sieve plate membrane 352.

[0104] like Figure 3 、 Figure 5 、 Figure 7 and Figure 8 As shown, the oil removal assembly 350 also includes a first bevel gear 358, a second rotating rod 359, a second bevel gear 3510, a second gear 3511 and a gear ring 3512 for rotating the reciprocating screw 356. The first bevel gear 358 is fixedly mounted on the lower outer surface of the reciprocating screw 356. The second rotating rod 359 is rotatably mounted through the bottom of the mounting groove 357. The second bevel gear 3510 is fixedly mounted on the outer surface of the second rotating rod 359 near the first bevel gear 358. The second gear 3511 is fixedly mounted on the end of the second rotating rod 359. The gear ring 3512 that cooperates with the second rotating rod 359 is fixedly mounted on the inner wall of the oil removal cylinder 310.

[0105] It can be understood that when the mounting bracket 351 rotates, it can drive the second rotating rod 359 and the second gear 3511 to rotate along the inner wall of the oil removal cylinder 310. When the second gear 3511 rotates, it can engage and rotate through the gear ring 3512. When the second gear 3511 engages and rotates, it can drive the second rotating rod 359 to rotate on its own. When the second rotating rod 359 rotates on its own, it can drive the second bevel gear 3510 to rotate. When the second bevel gear 3510 rotates, it can drive the first bevel gear 358 to engage and rotate. When the first bevel gear 358 engages and rotates, it can drive the reciprocating screw 356 to rotate inside the mounting groove 357.

[0106] The above are only preferred specific embodiments of the present invention, but the scope of protection of the present invention is not limited thereto. Any technician familiar with this technical field, within the technical scope disclosed by the present invention, who makes equivalent replacements or changes based on the technical solutions and inventive concepts of the present invention, should be covered by the scope of protection of the present invention.

Claims

1. An oilfield polymer flooding water treatment system, comprising: A housing (100) is provided with a polymer flooding water treatment system comprising a pretreatment tank (200), an oil removal device (300), a sedimentation tank (400), an ozone oxidation tank (500) and an MBR membrane purification tank (600) installed therein from right to left, wherein the pretreatment tank (200) is used for initially condensing the oil in the polymer flooding water, the oil removal device (300) is used for separating the residue, oil and water in the polymer flooding water into three phases, the sedimentation tank (400) is used for sedimentation treatment of the polymer flooding water after the oil residue is removed, the ozone oxidation tank (500) is used for ozone treatment of the polymer flooding water, and the MBR membrane purification tank (600) is used for deep treatment of the polymer flooding water, characterized in that: The pretreatment tank (200) comprises a water inlet pipe (210) for conveying polymer flooding water to the pretreatment tank (200), and a dosing device (230) for conveying a demulsifier into the polymer flooding water; A water inlet pipe (210) is installed inside the pretreatment tank (200), and a dosing device (230) is installed on the top of the housing (100), and the dosing device (230) is connected to the water inlet pipe (210) through a pipeline; The oil removal device (300) comprises an oil removal cylinder (310) for placing polymer flooding water, a slag storage box (320) for separating the polymer flooding water into three phases of slag, oil and water, an oil collecting assembly (340), an oil removal assembly (350) and a drainage trough (360), and a driving assembly (330) for driving the oil removal assembly (350) to rotate. An oil removal cylinder (310) is installed inside the housing (100), and a slag storage box (320) is installed at the bottom of the oil removal cylinder (310) through a pipeline; An oil collecting assembly (340) is installed through the interior of the oil removing cylinder (310), and an oil removing assembly (350) is installed on the side of the oil collecting assembly (340); A driving assembly (330) is installed on the top of the oil collecting assembly (340), and a drainage trough (360) is fixedly installed on the upper edge of the top of the oil removal cylinder (310).

2. The oilfield polymer flooding water treatment system according to claim 1, characterized in that: The pretreatment tank (200) also includes an impeller (220) for mixing polymer flooding water with an emulsion breaker, and an aerator (240) for increasing the agglomeration of fine oil liquid; An impeller (220) is installed inside the water inlet pipe (210) near the dosing device (230), and an aerator (240) is installed inside the pretreatment tank (200).

3. The oilfield polymer flooding water treatment system according to claim 1, characterized in that: The driving assembly (330) includes a reduction gear box (331) for mounting components of the driving assembly (330), a driving motor (333) for applying driving force to the driving assembly (330), and a movable mounting plate (332) for mounting the driving motor (333); A reduction box (331) is fixedly mounted on the top of the housing (100) near the oil removal cylinder (310), and a movable mounting plate (332) is movably mounted on the top of the reduction box (331) through an assembly groove; A driving motor (333) is fixedly mounted on the movable mounting plate (332), and an output end of the driving motor (333) passes through the top of the movable mounting plate (332); The driving assembly (330) further includes a driving gear (335) for adjusting the rotation speed of the driving assembly (330), a telescopic rod (334) for converting the driving gear (335), a first cylinder (336), and a slide rail (337) for mounting the first cylinder (336); One end of a telescopic rod (334) is fixedly mounted on the output end of the driving motor (333), and three driving gears (335) with decreasing diameters from top to bottom are fixedly mounted at equal distances on the lower portion of the telescopic end of the telescopic rod (334); A slide rail (337) is fixedly mounted on the bottom of the inner wall of the reduction box (331), and a first cylinder (336) is movably mounted on the slide rail (337); The output end of the first cylinder (336) and the bottom end of the telescopic rod (334) are connected via a bearing.

4. The oilfield polymer flooding water treatment system according to claim 3, characterized in that: The driving assembly (330) further includes a second cylinder (339) for driving the driving motor (333) to move, and a first fixing frame (338) and a fixing plate (3310) for mounting the second cylinder (339); A first fixing frame (338) is fixedly mounted on the movable mounting plate (332), and a second cylinder (339) is fixedly mounted on the first fixing frame (338); A fixing plate (3310) is fixedly mounted on the output end of the second cylinder (339), and the bottom of the fixing plate (3310) is fixedly mounted on the top of the reduction gear box (331); The driving assembly (330) further includes a rotating shaft (3311) for driving the oil collecting assembly (340) to rotate, and a reduction gear set (3312) for reducing the rotation of the rotating shaft (3311); A rotating shaft (3311) is rotatably installed between the reduction gear box (331) and the housing (100), and a reduction gear set (3312) that cooperates with the driving gear (335) is provided on the outer surface of the reduction gear box (3311) near the reduction gear box (331).

5. The oilfield polymer flooding water treatment system according to claim 4, characterized in that: The oil collecting assembly (340) includes a sleeve (341) for axial sliding of the rotating shaft (3311), an annular gear block (342) for adjusting the height of the rotating shaft (3311), a second fixing frame (343), a first rotating rod (344), a first gear (345) and a thread (346); A sleeve (341) is axially movably mounted on the outer surface of the middle portion of the rotating shaft (3311) via a guide groove and a guide rod, and the sleeve (341) is rotatably mounted inside the reduction gear box (331) and the housing (100) via a bearing. A plurality of annular gear blocks (342) are installed at equal distances on the upper outer surface of the rotating shaft (3311), and a second fixing frame (343) is fixedly installed on the top of the reduction gear box (331); One end of a first rotating rod (344) is rotatably mounted on a surface of the second fixing frame (343) close to the rotating shaft (3311) via a bearing, and the other end of the first rotating rod (344) passes through the surface of the first fixing frame (338) and is connected via a thread (346); A first gear (345) that matches the annular gear block (342) is fixedly mounted on the outer surface of the first rotating rod (344).

6. The oilfield polymer flooding water treatment system according to claim 5, characterized in that: The oil collecting assembly (340) further comprises an oil inlet (348) for conveying oil, a first rotating rod (349) and an oil outlet (3410), a lifting rod (347) for adjusting the height of the oil inlet (348), and an oil storage tank (3411) for storing oil. A lifting rod (347) is fixedly mounted on the bottom end of the rotating shaft (3311), and the outer surface of the lifting rod (347) is provided with at least four oil inlets (348) in a circular array. A first rotating rod (349) is mounted on the outer surface of the lifting rod (347) via a guide groove and axially movable with the guide rod, and an oil outlet (3410) is fixedly mounted on the bottom of the inner wall of the oil removal cylinder (310) via an assembly groove. The top end of the oil outlet (3410) is connected to the bottom end of the first rotating rod (349) via a bearing, and an oil storage tank (3411) is fixedly installed at the end of the oil outlet (3410), and the oil storage tank (3411) is fixedly installed inside the housing (100).

7. The oilfield polymer flooding water treatment system according to claim 6, characterized in that: The oil removal assembly (350) includes a sieve plate membrane (352) for oil-liquid separation, a mounting frame (351) for mounting the sieve plate membrane (352), and a cleaning brush (353) for cleaning the sieve plate membrane (352). At least three mounting brackets (351) are fixedly mounted on the outer surface of the first rotating rod (349) in a circular array, and a sieve plate membrane (352) is mounted on the mounting brackets (351); A cleaning brush (353) is provided on the surface of the sieve plate membrane (352).

8. The oilfield polymer flooding water treatment system according to claim 7, characterized in that: The oil removal assembly (350) further comprises a second rotating rod (3513) for mounting the cleaning brush (353), a mounting seat (354) for mounting the second rotating rod (3513), and a third gear (3514), a chute (3515) and a rack (3516) for rotating the cleaning brush (353) and the second rotating rod (3513). A second rotating rod (3513) is installed through the interior of the cleaning brush (353), and a second rotating rod (3513) is installed through the interior of the mounting seat (354) via an assembly groove. A third gear (3514) is fixedly mounted on one end of the second rotating rod (3513), and a sliding groove (3515) is provided on a side of the mounting frame (351) close to the third gear (3514); A rack (3516) is installed inside the slide groove (3515) and matches the third gear (3514).

9. The oilfield polymer flooding water treatment system according to claim 8, characterized in that: The oil removal assembly (350) further includes an internal threaded slider (355) and a reciprocating screw (356) for moving the mounting seat (354), and a mounting groove (357) for mounting the internal threaded slider (355) and the reciprocating screw (356); The mounting frame (351) is provided with a mounting groove (357) on the other side away from the slide groove (3515), and a reciprocating screw rod (356) is rotatably installed inside the mounting groove (357); The side surface of the reciprocating screw rod (356) is threadedly connected to an internal thread slider (355), and one end of a mounting seat (354) is fixedly mounted on the side surface of the internal thread slider (355).

10. The oilfield polymer flooding water treatment system according to claim 9, characterized in that: The oil removal assembly (350) further includes a first bevel gear (358), a second rotating rod (359), a second bevel gear (3510), a second gear (3511) and a gear ring (3512) for rotating the reciprocating screw (356); A first bevel gear (358) is fixedly mounted on the lower outer surface of the reciprocating screw rod (356), and a second rotating rod (359) is rotatably mounted through the bottom of the mounting groove (357); A second bevel gear (3510) is fixedly mounted on the outer surface of the second rotating rod (359) close to the first bevel gear (358), and a second gear (3511) is fixedly mounted on the end of the second rotating rod (359); A gear ring (3512) that matches the second rotating rod (359) is fixedly mounted on the inner wall of the oil removal cylinder (310).

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